Interfaces and surfaces are where the action happens. Catalysis, molecular recognition, charge transfer, polymerization and many other critical processes take place at the boundary between one medium and another. With the need to integrate new materials into devices, and applications ranging from catalysis to sensors, medicine to self-cleaning surfaces, and displays to lasers, fundamental and applied studies of surface and interface processes and optimization are of critical importance in developing new technology to meet today's challenges. The selection of recent research articles presented below illustrates the vast potential of this field.
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Inspired by the concept of sacrificial bond, a strong yet sacrificial interface composed of metal–ligand coordination bonds is constructed in the rubber/graphene composite. The strong interface ensures a high efficient stress transfer meanwhile it is sacrificial during stretching, which dissipates enormous energy. As a result, the composite exhibits a combination of high strength and high toughness.
Jing Huang, Zhenghai Tang, Zhijun Yang, Baochun Guo
Macromol. Rapid Commun., May 27, 2016, DOI: 10.1002/marc.201600226. Read article
When an external electric field is applied to a bilayer junction of La0.7Ca0.3MnO3 (LCMO) and PrBa2Cu3O7 (PBCO), it alters the positions of the Mn atoms at the LCMO/PBCO interface, turning On/Off a magnetic dead layer (MDL). The switching of MDL causes memristive hysteresis in the LCMO/PBCO bilayer junction.
Xiao Shen, Timothy J. Pennycook, David Hernandez-Martin, Ana Pérez, Yevgeniy S. Puzyrev, Yaohua Liu, Suzanne G. E. te Velthuis, John W. Freeland, Padraic Shafer, Chenhui Zhu, Maria Varela, Carlos Leon, Zouhair Sefrioui, Jacobo Santamaria, Sokrates T. Pantelides
Adv. Mater. Interfaces, May 27, 2016, DOI: 10.1002/admi.201600086. Read article
Oxidized foils: Platinum and iridium polycrystalline foils are oxidized electrochemically through anodization to create thin platinum and iridium hydrous oxide layers, which are analyzed through X-ray photoelectron spectroscopy. The complexity of such hydrous oxide systems is discussed in detail.
Benjamin Johnson, Chinmoy Ranjan, Mark Greiner, Rosa Arrigo, Manfred Erwin Schuster, Britta Höpfner, Mihaela Gorgoi, Iver Lauermann, Marc Willinger, Axel Knop-Gericke, Robert Schlögl
ChemSusChem, May 25, 2016, DOI: 10.1002/cssc.201600143. Read article
Inspired by marine mussel adhesive systems, numerous 3,4-dihydroxyphenylalanine (DOPA) containing surface coating materials have been designed recently. It is well known that DOPA has strong adhesion ability to different kinds of wet surfaces. However, the molecular mechanism on DOPA adhesion remains elusive. Recent biophysical studies of DOPA adhesion by both surface force apparatus (SFA) and atomic force microscopy (AFM) suggest that DOPA can bind to a wide range surfaces of diverse chemical properties with different binding mechanism. Here, using AFM based single molecule force spectroscopy, we show that even for chemically well-defined crystal surfaces, DOPA can bind to them with multiple binding modes. The binding forces for DOPA to different rutile TiO2 surfaces can vary in a broad range from 40- 800 pN at a pulling speed of 1000 nm s-1 and are largely dependent on the surface properties. Our finding indicates that local chemical environments could greatly affect DOPA adhesion and single molecule force spectroscopy is a unique tool to reveal the heterogeneity of DOPA adhesion to the same surface.
Yiran Li, Huanyu Liu, Tiankuo Wang, Meng Qin, Yi Cao, Wei Wang
ChemPhysChem, May 25, 2016, DOI: 10.1002/cphc.201600374. Read article
Membranes of cross-linked Au Nanoparticles (NPs) are assembled at an oil–water interface during the coalescence phase. Owing to the decreasing surface available, Au NPs are driven to pack and form a membrane, constituted of one or a few monolayers, which spans over square centimeters. The process is compatible with the coassembly of other nanosized objects, as demonstrated with carbon nanotubes.
Benjamin Le Ouay, Stefan Guldin, Zhi Luo, Sergio Allegri, Francesco Stellacci
Adv. Mater. Interfaces, May 25, 2016, DOI: 10.1002/admi.201600191. Read article
Inside and out: A facile method yields a novel superparamagnetic Janus nanotube with anisotropic morphology. FeOOH is introduced onto the sulfonated polydivinylbenzene (PDVB) tubes and subsequently coated with a thin layer of silica. The composite nanotubes become superparamagnetic after calcination. Selective modification of the interior and exterior surfaces yields superparamagnetic nanotubes with Janus shells. Desired species can be selectively captured into the cavity of the Janus nanotubes from their surroundings.
Ying Chen, Zhen Liu, Xiaozhong Qu, Fuxin Liang, Zhenzhong Yang
Chem. Asian J., May 24, 2016, DOI: 10.1002/asia.201600435. Read article
A full-polarization arbitrary-shaped 3D metasurface cloak with preserved amplitude and phase in microwave frequencies is experimentally demonstrated. By taking the unique feature of metasurfaces, it is shown that the cloak can completely restore the polarization, amplitude, and phase of light for full polarization as if light was incident on a flat mirror.
Yihao Yang, Liqiao Jing, Bin Zheng, Ran Hao, Wenyan Yin, Erping Li, Costas M. Soukoulis, Hongsheng Chen
Adv. Mater., May 24, 2016, DOI: 10.1002/adma.201600625. Read article
Here, a proton-driven molecular pump is devised using a surface-confined dynamic 3D DNA scaffold. A dynamic DNA tetrahedral nanostructure is designed by incorporating a pH-sensitive i-motif sequence in one edge, which serves as the scaffold to ensure highly ordered orientation and spatial isolation of this nanomachine on the macroscopic gold surface. It is found that the switching ability of this dynamic tetrahedron is fully maintained on the surface. Importantly, this proton-driven nanomachine can reversibly pump water and ferricynide in response to pH variation in solution.
Dan Zhu, Hao Pei, Guangbao Yao, Lihua Wang, Shao Su, Jie Chao, Lianhui Wang, Ali Aldalbahi, Shiping Song, Jiye Shi, Jun Hu, Chunhai Fan, Xiaolei Zuo
Adv. Mater., May 24, 2016, DOI: 10.1002/adma.201506407. Read article
Super liquid-repellent surfaces have self-cleaning properties and are desirable for many applications. These surfaces are highly porous on the nano- or micrometer scale, what inherently makes them mechanically weak. It is demonstrated that force-sensitive measurements using the colloidal probe technique can be used to optimize for mechanical strength and low wettability by tuning the reaction parameters of soot-templated surfaces.
Maxime Paven, Regina Fuchs, Taro Yakabe, Doris Vollmer, Michael Kappl, Akiko N. Itakura, Hans-Jürgen Butt
Adv. Funct. Mater., May 24, 2016, DOI: 10.1002/adfm.201600627. Read article
The work function values and trends of twenty technologically important perovskite oxides are investigated using density functional theory. The governing work function physics are developed using concepts of bonding ionicity, hybridization, band filling, surface dipoles, and the oxygen band center as an electronic structure descriptor. SrVO3 is found to be a new promising, low work function electron emission material.
Ryan Jacobs, John Booske, Dane Morgan
Adv. Funct. Mater., May 24, 2016, DOI: 10.1002/adfm.201600243. Read article
Long-range ordered monolayer thin films of lead sulfide (PbS) nanocrystals (NCs) are obtained by in situ exchanging native oleic acid ligands with halogen ions at the liquid–air interface. Further treatments on these films with dimethyl sulfoxide, methanol, or their mixture greatly enhance the coupling between NCs. The films exhibit good p-type transport property from field effect transistors measurement with high hole mobility of 0.224 cm2 V−1 s−1, representing the best thin film devices from PbS NCs.
Man Zhao, Fangxu Yang, Chao Liang, Dawei Wang, Defang Ding, Jiawei Lv, Jianqi Zhang, Wenping Hu, Chenguang Lu, Zhiyong Tang
Adv. Funct. Mater., May 23, 2016, DOI: 10.1002/adfm.201601735. Read article
Surface water layers strongly affect the 2D electron gas (2DEG) formed at LaAlO3/SrTiO3 interfaces. While surface hydrogens and hydroxyls contribute distinct electron donating and charge trapping surface states, the hydrogen bond network generated from molecular water provides an energetically feasible pathway for the proton exchange with the environments and therefore makes the interface 2DEG highly sensitive to thermodynamic processes.
Sanjay Adhikari, Andrés C. Garcia-Castro, Aldo H. Romero, Hyungwoo Lee, Jung-Woo Lee, Sangwoo Ryu, Chang-Beom Eom, Cheng Cen
Adv. Funct. Mater., May 23, 2016, DOI: 10.1002/adfm.201600820. Read article
Nitrous oxide decomposition: A Co–Ti oxide catalyst with a Co/Ti molar ratio of 0.6 shows high catalytic stability and strong resistance against O2, H2O, and NO for N2O decomposition, which is attributed to the high amount of surface Co3+ based on the interaction between the Co and Ti oxide.
Chi Zhang, Zhiping Zhang, Chao Sui, Fulong Yuan, Xiaoyu Niu, Yujun Zhu
ChemCatChem, May 20, 2016, DOI: 10.1002/cctc.201600231. Read article
Plasmonic coupling is studied in rippled nanoparticles/Graphene/nanoparticles structures, in which single layer or multilayer graphene act as spacer between nanoparticles. The plasmonic coupling effect in the multilayer graphene spacer increases with shrinkage, depending on the nanoparticles size. For the single layer graphene, the enhancement effect arises mostly from the coupling through its thin thickness, rather than by rippling the structure.
Khang June Lee, Daewon Kim, Byung Chul Jang, Da-Jin Kim, Hamin Park, Dae Yool Jung, Woonggi Hong, Tae Keun Kim, Yang-Kyu Choi, Sung-Yool Choi
Adv. Funct. Mater., May 20, 2016, DOI: 10.1002/adfm.201601850. Read article
Cardiac diseases are the most prevalent causes of mortality in the world. Cell-based transplanting and tissue engineering have gained significant attention for cardiac therapy. In this article, we explore tissue engineering strategies, which have emphasized on the use of nano-enabled approaches (e.g. nanoparticles, nanotopographies) in combination with stem cells for regeneration and repair of injured myocardium upon myocardial infarction (MI).
Mahshid Kharaziha, Adnan Memic, Mohsen Akbari, David A. Brafman, Mehdi Nikkhah
Adv. Healthcare Mater., May 19, 2016, DOI: 10.1002/adhm.201600088. Read article
An interfacial etching approach is developed for the synthesis of monodisperse and ultra-small thiolated palladium nanoclusters (Pd NCs) using Zr-UiO-66-NH₂ metal-organic frameworks (MOFs) as sacrificial templates. The Pd NCs are originally synthesized inside the cavities of the MOFs (Pd@UiO-66-NH₂). The Pd NCs released from the MOFs have a strikingly small size with narrow distribution (1.1 ± 0.1 nm), amounting to a molecular size of ca. 40 Pd atoms. UV-Vis absorption spectra of these Pd NCs show clear band structure that is similar to those observed in Au NCs. The ¹H NMR spectrum indicates that thiol is the only capping agent for these Pd NCs. The composition of the thiolated Pd NCs is derived using thermogravimetric analysis (TGA) and inductively coupled plasma mass spectrometry (ICP-MS) analysis. Moreover, the Pd NCs size can be tuned by using MOFs templates with different cavity sizes. The thiolated Pd NCs are catalytically active in a model Suzuki-Miyaura coupling reaction.
Xinle Li, Chaoxian Xiao, Tian Wei Goh, Alexandria L. D. Stanton, Yuchen Pei, Prashant K. Jain, Wenyu Huang
ChemNanoMat, May 18, 2016, DOI: 10.1002/cnma.201600121. Read article
A novel percolative nanocomposite with super-high permittivity and supressed dielectric loss is achieved, which is due to the hierarchical interfaces induced by BaSrTiO3 nanocuboid dotted graphene sheets and further modification of dapamine.
Hang Luo, Kechao Zhou, Christopher Bowen, Fuqiang Zhang, Anqi Wei, Zhong Wu, Chao Chen, Dou Zhang
Adv. Mater. Interfaces, May 18, 2016, DOI: 10.1002/admi.201600157. Read article
A new biomimetic surface named nano-micro binary polymer brushes is fabricated by large-area bench-top dip-pen nanodisplacement lithography technique. It is composed of gelatin-modified poly(glycidyl methacrylate) nanolines which are spaced by microstripes of poly(N-isopropylacrylamide). Cells are not only adhered and oriented well on the re-used surface, but also detachable from the surface with well-preserved extracellular matrix and aligned morphology.
Lina Chen, Zhuang Xie, Tiansheng Gan, Yi Wang, Guangzhao Zhang, Chad A. Mirkin, Zijian Zheng
Small, May 17, 2016, DOI: 10.1002/smll.201600634. Read article
The separation of organic liquid mixtures is achieved by Cu(OH)2 nanoneedle-covered copper mesh based on the difference of the liquid surface tension. The as-prepared membrane allows the penetration of organic liquid with smaller surface tension and blocks the higher. Thus, the effective separation of these two organic liquids can be achieved.
Jing Liu, Li Wang, Nü Wang, Fengyun Guo, Lanlan Hou, Yuee Chen, Jingchong Liu, Yong Zhao, Lei Jiang
Small, May 17, 2016, DOI: 10.1002/smll.201600499. Read article
Photoreactive polymer systems are synthesized from a commercially available polyether via polymer analogous introduction of benzophenone moieties. The obtained polymers are able to create surface-attached polymer networks upon brief UV irradiation via C,H insertion crosslinking. The BP-modified polymers can serve as negative photo-resists which allow in a very simple manner the generation of relief structures on various substrates, even on chemically rather inert polymer substrates such as polyolefins.
Anne-Katrin Schuler, Oswald Prucker, Jürgen Rühe
Macromol. Chem. Phys., May 17, 2016, DOI: 10.1002/macp.201600065. Read article
A simple strategy for the rapid preparation of multifunctional polydopamine (pDA) coatings is demonstrated. Microwave irradiation of the coating solution enables the formation of a ≈18 nm thick, genuine pDA coating in 15 min, which is ≈18 times faster than conventional coating. The acceleration effect results from the radical generation and temperature increase, which facilitate thermally accelerated radical polymerization of dopamine.
Mihyun Lee, Si-Hwa Lee, Il-Kwon Oh, Haeshin Lee
Small, May 13, 2016, DOI: 10.1002/smll.201600443. Read article
Reverse micelles: At low water content, incorporation of tri-n-octyl phosphine oxide (TOPO) in sodium 1,4-bis-2-ethylhexylsulfosuccinate (AOT) reverse micelles causes a progressive decrease in the mixed interfacial micropolarity, the hydrogen-bond donor capability of water, and the “bulk-like” water formation (see figure; QB=1-methyl-8-oxyquinolinium betaine).
Emmanuel Odella, R. Darío Falcone, Juana J. Silber, N. Mariano Correa
ChemPhysChem, May 13, 2016, DOI: 10.1002/cphc.201600216. Read article
Aromatic azo compounds are high-value chemicals extensively used as pigments, drugs, and food additives, but their production typically requires stoichiometric amounts of environmentally unfriendly metals or nitrites. There is an urgent need to develop a dual catalytic system capable of reducing nitroaromatics to aromatic amines, followed by their oxidation to azo compounds. Here we report such a dual catalyst based on Ag@Pd-Ag core-frame nanocubes for the stepwise conversion of 4-nitrothiophenol to trans-4,4'-dimercaptoazobezene under ambient conditions. Our in-situ surface-enhanced Raman spectroscopy study reveals three sequential processes that include the Pd-catalyzed reduction of 4-nitrothiophenol to 4-aminethiophenol by hydrogen, a period during which the 4-aminothiophenol remain unchanged until all hydrogen has depleted, and the Ag-catalyzed oxidation of 4-aminothiphenol to trans-4,4'-dimercaptoazobezene by the O2 from air. This work will lead to an environment-friendly and sustainable approach to the production of aromatic azo compounds.
Jumei Li, Yiren Wu, Xiaojun Sun, Jingyue Liu, Sarah A. Winget, Dong Qin
ChemNanoMat, May 13, 2016, DOI: 10.1002/cnma.201600153. Read article
A method is used to obtain a surface enhanced Raman spectrum of a single, nanosized exosome-like vesicle (ELV) while maintaining individual ELVs in suspension. Based on these spectra, ELVs derived from different cell types can be distinguished, hence allowing the identification and quantification of specific (cancerous) ELVs in a mixture.
Stephan Stremersch, Monica Marro, Bat-El Pinchasik, Pieter Baatsen, An Hendrix, Stefaan C. De Smedt, Pablo Loza-Alvarez, Andre G. Skirtach, Koen Raemdonck, Kevin Braeckmans
Small, May 12, 2016, DOI: 10.1002/smll.201600393. Read article
Monodispersed Li4Ti5O12 (LTO) nanoparticles with controlled microstructure were successfully synthesized by a combination of hydrolysis and hydrothermal method followed by a post-annealing process. The scanning electron microscopy images showed that particles with a size of 30-50 nm were precisely controlled throughout the synthesis process. The electrochemical tests of the as-prepared LTO electrodes in a half-cell proved its high rate performance and outstanding cyclability which benefits from the preserved well-controlled nanoparticle size and morphology. LTO electrodes were also tested in a full cell configuration in pairing with LiFePO4 cathodes, which demonstrated a capacity of 147.3 mAh g-1. In addition, we have also demonstrated that LTO materials prepared using lithium salts separated from geothermal brine solutions had good cyclability. These demonstrations provide a promising way for making low-cost, large-scale LTO electrode materials for energy storage applications.
Yunchao Li, Guoyi Fu, Mark Watson, Stephen Harrison, Mariappan Parans Paranthaman
ChemNanoMat, May 12, 2016, DOI: 10.1002/cnma.201600106. Read article
The wetting of air bubbles by oil droplets in an aqueous medium can be altered through the presence of colloidal particles. Cellulosic particles can be used both to promote “bubble wetting” and induce complete bubble engulfment by an oil drop and to trigger “bubble dewetting.” In addition to promoting bubble wetting and dewetting, particle adsorption at different rates to air–water and oil–water interfaces can lead to reentrant wetting behavior with slow transition dynamics.
Yi Zhang, Abiola Shitta, J. Carson Meredith, Sven H. Behrens
Small, May 11, 2016, DOI: 10.1002/smll.201600799. Read article
Surface patterned shape memory polymers of chemically crosslinked polycyclooctene (cPCO) are used to continuously tune the wettability by controlling the recovery temperature and/or time. Coating surface modified titanium dioxide nanoparticles onto the patterned cPCO surfaces can reach the superhydrophobic region and expand the tunable range of contact angles. This novel strategy benefits the development in the smart surfaces with tunable wettability.
Lingyu Zhao, Jun Zhao, Yayun Liu, Yufeng Guo, Liangpei Zhang, Zhuo Chen, Hui Zhang, Zhong Zhang
Small, May 11, 2016, DOI: 10.1002/smll.201600092. Read article
Single-crystalline W-doped VO2 nanobeams are obtained via rolling from a 2D precursor, exhibiting uniform tungsten doping, a low transition temperature and dual surface plasmon resonance peaks.
Ning Wang, Martial Duchamp, Can Xue, Rafal E. Dunin-Borkowski, Guowei Liu, Yi Long
Adv. Mater. Interfaces, May 11, 2016, DOI: 10.1002/admi.201600164. Read article
Single particle dark-field spectroscopy was employed to measure exactly the same gold nanorod before and after the Pt adsorption. The Pt-induced plasmon damping in terms of linewidth increase is found dependent on the resonance wavelength of the measured nanorod, which is dispersive in nature.
Pengyu Xu, Xuxing Lu, Song Han, Weihui Ou, Yue Li, Sheng Chen, Junfei Xue, Yaping Ding, Weihai Ni
Small, May 09, 2016, DOI: 10.1002/smll.201600533. Read article
Self-assembling of monolayer has been used to include a nitronyl-nitroxide radical in organic spin-valves demonstrating that the presence of the molecular paramagnetic layer does not hamper the observation of a significant magnetoresistance that is altered by a spin filtering exerted by this engineered spinterface.
Lorenzo Poggini, Giuseppe Cucinotta, Abdul-Muizz Pradipto, Marco Scarrozza, Paolo Barone, Andrea Caneschi, Patrizio Graziosi, Marco Calbucci, Raimondo Cecchini, Valentin Alek Dediu, Silvia Picozzi, Matteo Mannini, Roberta Sessoli
Adv. Mater. Interfaces, May 06, 2016, DOI: 10.1002/admi.201500855. Read article
Surfaces of variable atom transfer radical polymerization (ATRP) initiator density can be prepared by self-initiated photografting polymerization, as indicated by dry graft layer thickness following ATRP. The technique requires only UV light and an ATRP initiator monomer to enable coupling, and the presence of a diluent monomer to provide density control.
Katie E. Styan, Christopher D. Easton, Lucy G. Weaver, Laurence Meagher
Macromol. Rapid Commun., May 04, 2016, DOI: 10.1002/marc.201600059. Read article
There is current considerable interest in the properties of semiconducting metal oxide nanoparticle substrates because of their utility in surface-enhanced Raman scattering, dye-sensitized solar cells, and photo-catalysis. While the enhancement of Raman activities of molecules adsorbed on these nanoparticles is due to a large increase in the polarizability because of charge transfer from the molecule to the semiconducting nanoparticle, little is known about the factors responsible for modulating the polarizability, particularly the influence of the solvent. Consequently, we have carried out Monte Carlo simulations of several hybrids to study the solvent effect on the dynamic polarizabilities and electronic spectra. Our results indicate that the presence of the solvent induces a shift in the polarization response that is dependent on the identity of the hybrid. The observed enhancement can be attributed to both the resonant character of the excitation and the participation of the solvent in the charge redistribution. The methodology employed in this work could be very valuable in both identifying and developing metal oxides as novel molecular sensors.
Yoelvis Orozco-Gonzalez, Pilarisetty Tarakeshwar, Sylvio Canuto, Vladimiro Mujica
ChemPhysChem, May 04, 2016, DOI: 10.1002/cphc.201600164. Read article
Surface and interface effects can virtually split a conjugated polymer thin film into vertically heterogeneous layers, each having different thermal and structural properties, leading to the deviations of these properties near surface and interface regions compared to those in the bulk of the film, and consequently affecting electronic properties of the thin film.
Hui Qin, Dan Liu, Tao Wang
Adv. Mater. Interfaces, May 04, 2016, DOI: 10.1002/admi.201600084. Read article
Diblock copoly(vinyl ether)s (PVEs) containing oxyethylene side-chains with methoxy and ethoxy groups are designed for the construction of a bio-inert interface. It is successfully demonstrated that the design of the side-chain structure of PVEs strongly impacts the aggregation state of the polymer as well as the aggregation state of water at the interface, leading to excellent blood-compatibility.
Yukari Oda, Cui Zhang, Daisuke Kawaguchi, Hisao Matsuno, Shokyoku Kanaoka, Sadahito Aoshima, Keiji Tanaka
Adv. Mater. Interfaces, May 04, 2016, DOI: 10.1002/admi.201600034. Read article
An electronically passivated titanium dioxide/silicon heterojunction is demonstrated in this correlated interface and device study. As the silicon doping is varied progressively from p++(1019) to n++(1019), the interface Fermi level position and device-relevant band offsets are found to shift monotonically. Simple Fermi level equilibration is revealed to be the driving mechanism behind the energy level alignment.
Gabriel Man, Jeffrey Schwartz, James C. Sturm, Antoine Kahn
Adv. Mater. Interfaces, May 04, 2016, DOI: 10.1002/admi.201600026. Read article
Reduced graphene oxide gel (femtogel) is fabricated using pulsed laser ablation in liquid. This novel technique involves focusing femtosecond laser pulses at the air/liquid interface of a high concentration single-flake aqueous graphene oxide solution. The hydroxyl groups, carbonyl groups, and water molecules are removed to facilitate the gel formation. The gel properties can be tuned by controlling the processing parameters.
Khaled H. Ibrahim, Mehrdad Irannejad, Mojtaba Hajialamdari, Ali Ramadhan, Kevin P. Musselman, Joseph Sanderson, Mustafa Yavuz
Adv. Mater. Interfaces, May 04, 2016, DOI: 10.1002/admi.201500864. Read article
Reentrant spin glass state with enhanced ferromagnetism is observed in ultrathin manganite/cuprate superlattices made of ferromagnetic La0.7Sr0.3MnO3 and antiferromagnetic La2CuO4. The evolution of the rich magnetic properties is attributed to the competition between multiple energetic ground states at the interfaces, which is confirmed by first-principles calculations.
Junfeng Ding, Fabrizio Cossu, Oleg I. Lebedev, Yuqin Zhang, Zhidong Zhang, Udo Schwingenschlögl, Tom Wu
Adv. Mater. Interfaces, May 04, 2016, DOI: 10.1002/admi.201500676. Read article
Liyuan Wang, Qinfeng Rong, Zhanfang Ma
Electroanalysis, May 03, 2016, DOI: 10.1002/elan.201600122. Read article
The effect of the transfer rate of signal molecules on coupled chemical oscillators arranged on a two-dimensional plane is systematically investigated by using the surface acoustic wave microfluidic technology. A robust synchronization of the oscillators is found at a proper input radio frequency power. The frequency of the chemical waves increases with increasing input power.
Dameng Guo, Yong Qing Fu, Bo Zheng
ChemPhysChem, May 03, 2016, DOI: 10.1002/cphc.201600293. Read article
Homogeneous dispersion and well interface quality of polymer/filler is crucial to obtain high-performance polymer composites. In this work, we use a novel method by using organic aminopropyl-functionalized nanosilica sols (OAS-sols) to functionlize graphene oxide (GO) to synthesize OAS covalently grafted graphene hybrid nanosheets (OAS-graphene). The zero spherical OAS covalently attached on two-dimensional (2D) nanosheets GO surfaces makes up OAS-graphene hybrid, which have large surface areas and homogeneous amino active sites on nanosheets. The OAS-graphene allowed to improve dispersion and interface compatibility as well as decrease thermal interfical resistance. As a result, the thermal conductivity and mechanical properties of the epoxy nanocomposites were significantly improved at a low loading while maintaining high electrical insulative properties.
Jifang Fu, Peisong Zong, Liya Chen, Xing Dong, Wenqi Yu, Liyi Shi, Deng Wei
ChemNanoMat, May 02, 2016, DOI: 10.1002/cnma.201600131. Read article
Selective photoluminescence enhancement for (7,5) tubes over all other chiralities is observed by dispersing single-walled carbon nanotube mixtures in single-stranded DNA (ssDNA) (ATT)4AT solution and modification with gold nanoparticles. This ssDNA sequence (ATT)4AT is reported to recognize and enable chromatographic purification of the (7,5) tubes.
Juan Yang, Qinghua Zhao, Min Lyu, Zhenyu Zhang, Xiao Wang, Meng Wang, Zhou Gao, Yan Li
Small, April 29, 2016, DOI: 10.1002/smll.201503883. Read article
Ezgi Topçu, Kader Dağcı, Murat Alanyalıoğlu
Electroanalysis, April 29, 2016, DOI: 10.1002/elan.201600108. Read article
Engineering interfaces of distinct extracellular compartments mimicking native tissues are key for in-depth in vitro studies on developmental and disease processes in biology and medicine. Sharp interfaces of extracellular matrices are constructed based on fibrillar collagen I networks with a multiparameter control of topology, mechanics, and composition, and their distinct impact on triggering the directionality of cancer cell migration is demonstrated.
Jiranuwat Sapudom, Stefan Rubner, Steve Martin, Tilo Pompe
Adv. Healthcare Mater., April 29, 2016, DOI: 10.1002/adhm.201600295. Read article
Harsh reality: The modification of electrodes with carbon nanotubes (CNTs) is currently employed in numerous applications as a way to improve their performance. Here, the effects of harsh (hno3) and mild (h2o2) oxidative treatments of CNTs are highlighted. Depending on the oxidative route, their electrochemical performances are indubitably different.
Rui Gusmão, Zdeněk Sofer, Michal Nováček, Martin Pumera
ChemElectroChem, April 27, 2016, DOI: 10.1002/celc.201600082. Read article
Switching like cilia: Upon irradiation with UV light, imines switch from trans to cis and rapidly isomerize back to trans again. Covalently mounted on molecular platforms, the imines form ordered monolayers on gold surfaces, which resemble ciliated epithelia in our respiratory tract.
Melanie Hammerich, Talina Rusch, Nicolai R. Krekiehn, Andreas Bloedorn, Olaf M. Magnussen, Rainer Herges
ChemPhysChem, April 26, 2016, DOI: 10.1002/cphc.201600147. Read article
Back and forth: IR and modeling studies on TiO2 nanoparticles reveal that the stretching frequency of adsorbed CO results from a synergic donation/backdonation mechanism, by which the surface oxygen anions act as electron donors even if not directly bonded to the adsorbate.
Chiara Deiana, Ettore Fois, Gianmario Martra, Stéphanie Narbey, Francesco Pellegrino, Gloria Tabacchi
ChemPhysChem, April 23, 2016, DOI: 10.1002/cphc.201600284. Read article
In a spin: A nanosecond time-resolution study yields new insights into the rotational motion of anchored rod-like nanoparticles at the liquid–solid interface. The continuous rotation observed under low temporal resolution is found to be comprised of numerous fast, intermittent transitions between a limited number of weakly immobilized states.
Bhanu Neupane, Fang Chen, Yanli Wei, Ning Fang, Frances S. Ligler, Gufeng Wang
ChemPhysChem, April 20, 2016, DOI: 10.1002/cphc.201600174. Read article
This Letter demonstrates that surface recombination at the periphery of the active region is an important mechanism of carrier losses, which has not yet been regarded as a factor capable of limiting the efficiency of InGaN-based LEDs. The impact of non-equilibrium carrier diffusivity and lifetime on the recombination losses is discussed in terms of simulations.
[Rapid Research Letter]
Kirill A. Bulashevich, Sergey Yu. Karpov
Phys. Status Solidi RRL, April 13, 2016, DOI: 10.1002/pssr.201600059. Read article
Runping Yang, Yuanlin Liu, Huazhen Ye, Bin Qiu, Zhenyu Lin, Longhua Guo
Electroanalysis, April 13, 2016, DOI: 10.1002/elan.201600125. Read article
Misfit dislocations in La0.7Sr0.3MnO3/LaAlO3 compressively strained heterostructures are shown to induce topographic and surface current patterning. The underpinning mechanism of this behavior is a lateral modulation of surface strain influencing the chemical potential (Δμ) and the bandwidth (W) at the free surface, providing a clue for the realization of spontaneous functional nanostructures in the ≈20 nm range.
Felip Sandiumenge, Núria Bagués, José Santiso, Markos Paradinas, Alberto Pomar, Zorica Konstantinovic, Carmen Ocal, Lluís Balcells, Marie-Jo Casanove, Benjamín Martínez
Adv. Mater. Interfaces, April 13, 2016, DOI: 10.1002/admi.201600106. Read article
Shining a light on photoreduction: Engineering of the surface/interface properties of graphene oxides by controllable photoreduction is presented. Typical photoreduction processes, including femtosecond laser direct writing, laser holographic lithography, and controllable UV irradiation, have been summarized. The photoreduction strategy shows distinct advantages, such as mask-free patterning, chemical-free modification, controllable reduction degree, and environmentally friendly processing; thus it holds great promise for the development of graphene-based devices.
Yu-Qing Liu, Yong-Lai Zhang, Yan Liu, Hao-Bo Jiang, Dong-Dong Han, Bing Han, Jing Feng, Hong-Bo Sun
The Chemical Record, April 09, 2016, DOI: 10.1002/tcr.201500306. Read article
At the interface: Ionic liquid/n-hexane interfaces are used as a new class of reaction media for the Diels–Alder reaction. The high polarities of ionic liquids and availability of hydrogen bonding and solvophobic interactions stabilizes the transition state, resulting in large rate constants and better endo selectivity.
Vijay Beniwal, Arpan Manna, Anil Kumar
ChemPhysChem, April 08, 2016, DOI: 10.1002/cphc.201600006. Read article
In a collaboration between COMSOL simulation based on a finite element method and post-mortem analysis, this study visualizes and predicts the Li stripping/deposition behavior of the surface modified Li metal during cycling. Surface-patterned Li metal having an optimized pattern dimension improves cycle retention abilities and power capabilities, as suppressing Li dendrite growth formation, to those of the bare Li metal.
Joonam Park, Jiseon Jeong, Yunju Lee, Min Oh, Myung-Hyun Ryou, Yong Min Lee
Adv. Mater. Interfaces, April 06, 2016, DOI: 10.1002/admi.201600140. Read article
By effectively tuning the gap size and the density of the Cu nanorods, the detection limit of benzenethiol can be as low as 10−10 m. With a thin layer of Ag coated on top, the surface-enhanced Raman spectroscopy (SERS) sensitivity of the Cu/Ag hybrid nanostructure can be further enhanced, capable of detecting SERS signal of benzenethiol in a 10−15 m solution.
Kun Chen, Xinyi Zhang, Yongliang Zhang, Dang Yuan Lei, Haitao Li, Timothy Williams, Douglas R. MacFarlane
Adv. Mater. Interfaces, April 06, 2016, DOI: 10.1002/admi.201600115. Read article
Mixed-matrix membranes (MMMs) were developed to overcome the limitations of polymeric and inorganic membranes and are regarded as state-of-the-art polymer-inorganic hybrids. Potential applications of layered silicates as inorganic fillers in MMM fabrication for CO2/CH4 separation are reviewed together with challenges for successful formation of layered silicate-based MMMs and future prospects.
Asif Jamil, Oh Pei Ching, Azmi B. M. Shariff
Chem. Eng. Technol., April 5, 2016, DOI: 10.1002/ceat.201500395. Read article.
Anharmonic downward distortion (ADD), indicated by the arrows, plays the role of a guidepost in the scaled hypersphere search method for searching reaction pathways connecting EQ, TS, and DC on the potential energy surface, one after another, to complete global reaction route mapping.
The Chemical Record, April 05, 2016, DOI: 10.1002/tcr.201500284. Read article
The wetting behavior of zinc oxide nanowires (NWs) can be tuned between superhydrophobic and superhydrophilic states by combining surface chemical functionalization and prepatterned substrates. Protonation/deprotonation of amine-groups interacting with acidic or basic media induces the ZnO NW wetting transition. The reversibility is promoted by ad-hoc pattern geometries, preventing the entrapment of air bubbles.
Marco Laurenti, Alessio Verna, Marco Fontana, Stefano Stassi, Giancarlo Canavese, Simone L. Marasso, Valentina Cauda
Adv. Mater. Interfaces, March 29, 2016, DOI: 10.1002/admi.201600110. Read article
Cost-effective spray deposition methodologies to fabricate high-performance large-scale patterned organic field effect transistors via surface energy-mediated self-patterning of organic semiconductors are presented in this study.
Han-Wen Hsu, Wei-Chieh Chang, Shih-Huang Tung, Cheng-Liang Liu
Adv. Mater. Interfaces, March 29, 2016, DOI: 10.1002/admi.201500714. Read article
A light jacket: Hematite electrodes with a carbon coating layer are obtained by using a simple electrodeposition method in an electrolyte containing citric acid additives. The carbon-coated electrodes exhibit a high photoelectrochemical performance with a photocurrent density of 2.1 mA cm−2 at 0.4 V versus SCE.
TsingHai Wang, Yi-Nuo Chen, Chia-Che Chiang, Yi-Kong Hsieh, Po-Chieh Li, Chu-Fang Wang
ChemElectroChem, March 22, 2016, DOI: 10.1002/celc.201600060. Read article
Three's a crowd: Electrochemically lithiated Si forms three phases on a Si(111) substrate, that is, a single-crystalline Li15Si4 (sc-Li15Si4) alloy phase with a three-fold symmetric triangular pyramid shape, which reflects the atomic arrangement of Si(111), an amorphous phase of Li15Si4 and/or Li13Si4 (a-Li15Si4 and/or a-Li13Si4), and a mixed phase of a-Li15Si4 and/or a-Li13Si4 alloys (52 %) and crystalline Si (c-Si) (48 %).
Nana Aoki, Asami Omachi, Kohei Uosaki, Toshihiro Kondo
ChemElectroChem, March 21, 2016, DOI: 10.1002/celc.201600030. Read article
A fluorocarbon-free nanoscale ultrasound contrast agent is described based on mesoporous silica particles with hydrophobic interiors and resuspension in an amphiphilic copolymer. Administration of high intensity focused ultrasound (HIFU) produces macroscopic bubbles, in the presence of down to 1010 nanoparticles particles mL−1. These agents provide ultrasound contrast in biological media, and imaging was sustained continuously for at least 20 min.
Adem Yildirim, Rajarshi Chattaraj, Nicholas T. Blum, Galen M. Goldscheitter, Andrew P. Goodwin
Adv. Healthcare Mater., March 15, 2016, DOI: 10.1002/adhm.201600030. Read article
Novel dendrons for multipresentation: Water soluble, tetravalent glycodendrons that perform as powerful mannose-binding-lectin (MBL) antagonists are described. The stable scaffold adopted is a versatile tool for nested-layer multipresentation, which enabled the preparation of higher valency antagonists. All the constructs were tested as MBL-C antagonist by a surface-plasmon-resonance assay and showed binding with IC50 values in the low micromolar range.
Giulio Goti, Alessandro Palmioli, Matteo Stravalaci, Sara Sattin, Maria-Grazia De Simoni, Marco Gobbi, Anna Bernardi
Chem. Eur. J., January 15, 2016, DOI: 10.1002/chem.201504388. Read article.
Chains linked: Through the interplay of high-resolution scanning tunneling microscopy imaging and density functional theory calculations, the stepwise homocoupling of alkyl chains on Cu(110) is demonstrated, proceeding from the intact chain, via the dehydrogenative intermediates, to the final coupling products.
Liangliang Cai, Qiang Sun, Chi Zhang, Yuanqi Ding, Wei Xu
Chem. Eur. J., January 8, 2016, DOI: 10.1002/chem.201504152. Read article.
NPs@surfaces: Molecular cross-linkers direct the immobilization of two different gold nanoparticles (AuNPs) on different substrates. Aggregates and island-like films were obtained by using two electronically different cross-linkers and two types of AuNPs with hydrophilic or hydrophobic capping layers (see figure; Cit=citrate, TOAB=tetraoctylammonium bromide).
Sreejith Shankar, Meital Orbach, Revital Kaminker, Michal Lahav, Milko E. van der Boom
Chem. Eur. J., January 7, 2016, DOI: 10.1002/chem.201503297. Read article.
Porphyrin swap shop: Spectroscopic adsorption studies on two complementary model systems, atomically clean thin MgO(100) films and MgO nanocube powders, show that low-coordinated surface cations located in corner, edge, or step regions of the MgO surfaces are subject to ion exchange between adsorbed porphyrin molecules and the oxide surface.
Johannes Schneider, Matthias Franke, Martin Gurrath, Michael Röckert, Thomas Berger, Johannes Bernardi, Bernd Meyer, Hans-Peter Steinrück, Ole Lytken, Oliver Diwald
Chem. Eur. J., December 18, 2015, DOI: 10.1002/chem.201503661. Read article.
Inspired by nature: The ability of blue mussels and other marine creatures to attach to surfaces underwater and to make advanced materials have gained increasing awareness and interest amongst chemists. The combination of catechols and coordination chemistry to yield self-healing materials is the most recent sprout on this growing tree and is the focus of this Minireview.
Marie Krogsgaard, Vicki Nue, Henrik Birkedal
Chem. Eur. J., November 12, 2015, DOI: 10.1002/chem.201503380. Read article.
LIB it up: Homogeneous Li4Ti5O12–TiO2 nanoporous composites can be easily fabricated through a nitrogen calcination process. The prepared samples (S-750-N) exhibit high capacity as well as good cycling stability when tested both at room temperature and 55 °C, which provides a novel method for the synthesis of composites used in relevant fields.
Wei Zhang, Zhongyi Liu, Xingcheng Xiao, Dawei Liu
CHEMELECTROCHEM, August 12, 2015, DOI: 10.1002/celc.201500299. Read article
The evolution of the solid electrolyte interface (SEI) in carbon-coated ZnFe2O4 (ZFO-C) anodes is studied by soft X-ray absorption spectroscopy (XAS). Experiments probe locally the SEI growth in the 2–100 nm range, using both total electron (TEY) and total fluorescence (TFY) yield techniques. XAS analysis shows that the SEI grows preferentially around the ZFO-C nanoparticles.
Andrea Di Cicco, Angelo Giglia, Roberto Gunnella, Stephan L. Koch, Franziska Mueller, Francesco Nobili, Marta Pasqualini, Stefano Passerini, Roberto Tossici, Agnieszka Witkowska
Adv. Energy Mater., July 03, 2015, DOI: 10.1002/aenm.201500642. Read article
Keeping it clean: A crystal growth mechanism of Bi5O7I nanobelts is proposed. The modified Bi5O7I composites show excellent degradation activity of malachite green and bactericidal effects against Pseudomonas aeruginosa, which may be attributed to the higher charge carrier separation efficiency of these heterojunction structures (see figure).
Chaohong Liu, Dun Zhang
Chem. Eur. J., June 30, 2015, DOI: 10.1002/chem.201500383. Read article.