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ACS Applied Materials & Interfaces

Ahmed Ziani, Tatsuya Shinagawa, Liga Stegenburga, Kazuhiro Takanabe
The decoration of (photo-) electrodes for efficient photoresponse requires the use of electrocatalysts with good dispersion and high transparency for efficient light absorption by the photoelectrode. As a result of the ease of thermal evaporation and particulate self-assembly growth, the phthalocyanine molecular species can be uniformly deposited layer-by-layer on the surface of substrates. This structure can be used as a template to achieve a tunable amount of catalysts, high dispersion of the nanoparticles and transparency of the catalysts...
November 4, 2016: ACS Applied Materials & Interfaces
Tan Li, Liping Wu, Jiang Zhang, Gaina Xi, Yilin Pang, Xiaoping Wang, Tongsheng Chen
In this study, a physiologically stable dual-polymer-functionalized reduced nanographene oxide (nrGO) conjugate (PEG-nrGO-PEI, RGPP) with high efficiency of gene delivery is successfully synthesized through mixing PEGylated nanographene oxide (PEG-nGO, GP) and polyethylenimine (PEI, 25 kDa) solution under 80 °C for 2 h. This hydrothermal reduction of GP during PEIylation promotes the nucleophilic reaction between the amino moieties of PEI and the epoxy groups (or carboxylic groups) in GP and then forms C-NH- groups (or NH-CO groups) to covalently connect PEI and GP, which makes the RGPP nanocomposite more stable in physiological environments and has superior gene transfection efficiency compared with the nonhydrothermally reduced PEG-nGO/PEI conjugate (GPP) obtained by mixing GP and PEI under 20 °C for 2 h...
November 4, 2016: ACS Applied Materials & Interfaces
Huier Gao, Si Chen, Jiajie Liang, Qibing Pei
Conjugated polymers containing long-chain alkyl side groups for solubility are generally unstretchable: large strain induces crack formation, fracture, or plastic deformation. When the polymers are stretched to re-orient the conjugated chains along the stretching direction high dichroic ratio is observed both for absorption of the ground state and radiative decay of the excited state. Here an interpenetrating polymer network (IPN) approach is reported to impart elastomeric deformability to a conjugated polymer...
November 4, 2016: ACS Applied Materials & Interfaces
Hasmukh A Patel, Noramalina Mansor, Srinivas Gadipelli, Dan J L Brett, Zhengxiao Guo
A hybrid membrane of superacid sulfated Zr-MOF (SZM) and Nafion shows much superior performance to Nafion, particularly for fuel cell operating under low humidity. The Brønsted acidic sites in SZM networks retain an ample amount of water which facilitated proton conduction under low humidity. The water retention properties of Nafion-SZM hybrid membranes with 1 wt.% loading of SZM increased at 35% relative humidity and outperformed commercial unfilled Nafion membrane. The proton conductivity increases by 23% for Nafion-SZM hybrid compared to unfilled Nafion membrane...
November 4, 2016: ACS Applied Materials & Interfaces
Yadveer S Grewal, Muhammad J A Shiddiky, Stephen M Mahler, Gerard A Cangelosi, Matt Trau
Rapid progress in disease biomarker discovery has increased the need for robust detection technologies. In the past several years, the designs of many immunoaffinity reagents have focused on lowering costs and improving specificity while also promoting stability. Antibody fragments (scFvs) have long been displayed on the surface of yeast and phage libraries for selection; however, the stable production of such fragments presents challenges that hamper their widespread use in diagnostics. Membrane and cell wall proteins similarly suffer from stability problems when solubilized from their native environment...
November 4, 2016: ACS Applied Materials & Interfaces
Yue Kang, Zhenhua Jiang, Tian Ma, Zengyong Chu, Gong-Yi Li
Sandwich-like hybrids of reduced graphene oxide (rGO) and hexagonal boron nitride (h-BN) were prepared via heat-treatment of the self-assemblies of graphene oxide (GO) and ammonia boron (AB). TG-DSC-QMS analysis indicate a mutual-promoted redox reaction between GO and AB. 900℃ is a proper temperature to transfer the hybrids into inorganic sandwiches. XRD, XPS and Raman spectra reveal the existence of h-BN embedded into the rGO frameworks. High-resolution SEM and TEM indicate the layer-by-layer structure of the hybrids...
November 3, 2016: ACS Applied Materials & Interfaces
Bomi Sim, Chang-Ki Moon, Kwon-Hyeon Kim, Jang-Joo Kim
We present a comprehensive model for the quantitative analysis of factors influencing the efficiency of organic light-emitting diodes (OLEDs) as a function of the current density. The model takes into account the contribution made by the charge carrier imbalance, quenching processes, and optical design loss of the device arising from various optical effects including the cavity structure, location and profile of the excitons, effective radiative quantum efficiency, and out-coupling efficiency. Quantitative analysis of the efficiency can be performed with an optical simulation using material parameters and experimental measurements of the exciton profile in the emission layer and the lifetime of the exciton as a function of the current density...
November 3, 2016: ACS Applied Materials & Interfaces
Aniruddha Basu, Kingshuk Roy, Neha Sharma, Shyamapada Nandi, Ramanathan Vaidhyanathan, Sunit Rane, Chandrashekhar V Rode, Satishchandra B Ogale
Over the past decade flexible and wearable micro-electronic devices and systems are gaining significant importance. Since portable power source is an essential need of such wearable devices, currently there is considerable research emphasis on the development of planar interdigitated micro energy storage devices by employing diverse precursor materials to obtain functional materials (functional carbon, oxides etc.) with the desirable set of properties. Herein we report for the first time the use of metal organic framework (MOF), Zeolitic imidazolate framework (ZIF-67), for high wavelength photothermal laser direct writing of metal-decorated and heteroatom-doped, porous few layer graphene electrodes for micro-supercapacitor application...
November 3, 2016: ACS Applied Materials & Interfaces
Qingqing Yao, Yangxi Liu, Jianning Tao, Keith M Baumgarten, Hongli Sun
Utilizing bio-mimetic materials to potentiate endogenous cell growth or signaling is superior to relying on exogenous cells or signals for bone formation. Desferoxamine (DFO), which is a hypoxia-mimetic agent that chelates iron (Fe3+), mimics hypoxia to encourage bone healing. However, high cytotoxicity, off-target effects, and the short half-life of DFO have significantly impeded its further applications. We mitigated these side effects by locally immobilizing DFO onto a gelatin nanofibrous (GF) scaffold that retained DFO's ability to chelate Fe3+...
November 3, 2016: ACS Applied Materials & Interfaces
Zhongshan Liu, Junjie Ou, Hongwei Wang, Xin You, Mingliang Ye
Four kinds of either hydrazide-linked or amide-linked polymers were facilely synthesized by using hydrazine, tetrakis(4-aminophenyl)methane (TAPM), terephthaloyl chloride (TPC) and trimesoyl chloride (TMC) as building blocks. The morphology, porosity, composition and surface property of polymers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption measurements, 13C/CP-MAS NMR, X-ray photoelectron spectroscopy (XPS), etc. The results indicated that building blocks had important effects on morphology and porosity...
November 3, 2016: ACS Applied Materials & Interfaces
Jaker Hossain, Qiming Liu, Takuya Miura, Koji Kasahara, Daisuke Harada, Ryo Ishikawa, Keiji Ueno, Hajime Shirai
We demonstrate the chemistry of amphiphilic perfluorosulfonic copolymer Nafion-coated conductive poly(3,4-ethyelenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and its effect on the photovoltaic performance of PEDOT:PSS/crystalline Si (c-Si) heterojunction solar cells. The highly hydrophilic sulfonate group of insulating, chemically stable Nafion interacts with PSS in PEDOT:PSS, which reduce the coulombic interaction between PEDOT and PSS. The highly hydrophobic fluorocarbon backbone of Nafion favorably interacts with hydrophobic PEDOT of PEDOT:PSS...
November 3, 2016: ACS Applied Materials & Interfaces
Rong Bai, Qing Zhang, Lanlan Li, Ping Li, Yan-Jie Wang, Oudjaniyobi Jacob Simalou, Yanling Zhang, Ge Gao, Alideertu Dong
N-Halamine-based antibacterial materials play a significant role in controlling microbial contamination, but their practical applications are limited because of their complicated synthetic process and indistinct antibacterial actions. In this study, novel antibacterial N-halamine-containing polymer fibers were synthesized via an one-step electrospinning of N-halamine-containing polymers without any additives. By adjusting the concentration of precursor and the molecular weight of polymers, the morphology and size of the as-spun N-halamine-containing fibers can be regulated...
November 3, 2016: ACS Applied Materials & Interfaces
Minjie Shi, Liping Zhao, Xuefeng Song, Jing Liu, Peng Zhang, Lian Gao
Nano-structured transition metal carbides (TMCs) with superior electrochemical properties are promising materials for high-efficiency energy storage applications. Herein, one-dimensional molybdenum carbide nanofibers (Mo2C NFs) have been fabricated by a facile and effective electrospinning strategy. Based on the cross-linked network architecture with ultrahigh electronic conductivity, each Mo2C NFs is uniformly encapsulated in lamellar manganese dioxide (MnO2) via electro-deposition method, forming a self-supported MnO2-Mo2C NFs film with excellent electrochemical activity...
November 3, 2016: ACS Applied Materials & Interfaces
Xiongwu Zhong, Zhen-Zhong Yang, Yu Jiang, Weihan Li, Lin Gu, Yan Yu
Na3V2(PO4)3 (NVP) has been considered as a most promising cathode materials for sodium ion battery (SIBs). But NVP usually exhibits poor cycling stability and rate performance due to the low intrinsic electrical conductivity. Herein, we prepared carbon coated Na3V2(PO4)3 anchored on freestanding graphite foam (denoted as NVP@C-GF) as cathode for SIBs. The NVP@C-GF exhibits superior sodium-ion storage performance, including rate capability (56 mAhg-1 at 200C) and long cycle life (54 mAhg-1 at 100 C after 20000 cycles)...
November 3, 2016: ACS Applied Materials & Interfaces
Kongfa Chen, Na Li, Na Ai, Yi Cheng, William D A Rickard, San Ping Jiang
Application of cobaltite-based electrodes such as La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) on Y2O3-ZrO2 (YSZ) electrolyte in solid oxide fuel cells (SOFCs) generally requires the use of a doped ceria barrier layer to prevent the interaction between LSCF and YSZ during sintering at high temperatures. In this paper, we report for the first time an in situ assembly approach to directly incorporate LSCF cathode to YSZ electrolyte without the use of a doped ceria barrier layer and without pre-sintering at high temperatures...
November 3, 2016: ACS Applied Materials & Interfaces
Paola Lova, Chiara Bastianini, Paolo Giusto, Maddalena Patrini, Paola Rizzo, Gaetano Guerra, Mario Iodice, Cesare Soci, Davide Comoretto
The lack of sensors for low cost, extensive and continuous detection of vapor pollutants is a serious concern for health and safety in industrialized urban areas. Colorimetric sensors, such as distributed Bragg reflectors made of polymers, could achieve this task thanks to their low cost and easy signal transduction, but are typically affected by low vapor permeability and lack of selectivity without chemical labelling. Here we demonstrate all-polymer Bragg multilayers for label-free selective detection of organic volatile compounds...
November 3, 2016: ACS Applied Materials & Interfaces
Xiaolei Wang, Ge Li, Min Ho Seo, Gregory Lui, Fathy M Hassan, Kun Feng, Xingcheng Xiao, Zhongwei W Chen
A novel self-supported electrode with long cycling life and high mass loading is developed based on carbon-coated Si nanowires in situ grown on highly conductive and flexible carbon fabric substrates through a nickel catalyzed one-pot atmospheric pressure chemical vapor deposition. The high-quality carbon coated Si nanowires result in high reversible specific capacity (~3500 mA h g(-1) at 100 mA g(-1)), while 3D electrode's unique architecture leads to a significantly improved robustness and a high degree of electrode stability...
November 3, 2016: ACS Applied Materials & Interfaces
Yanna Cui, Meng Zhang, Feng Zeng, Hongyue Jin, Qin Xu, Yongzhuo Huang
Chemotherapy is one of the most important strategies for glioma treatment. However, the "impermeability" of the blood-brain barrier (BBB) impedes most chemotherapeutics to enter the brain, thereby rendering very few drugs suitable for glioma therapy, letting along application of combination of chemotherapeutics. Thereby, it is a pressing need to overcome the obstacles. A dual-targeting strategy was developed by combination of magnetic-guidance and the transferrin receptor-binding peptide T7-mediated active targeting delivery...
November 3, 2016: ACS Applied Materials & Interfaces
Brian M Jun, Francesca Serra, Yu Xia, Hong Suk Kang, Shu Yang
Free-standing, self-aligned, high-aspect-ratio (length to cross-section, up to 15.5) waveguides that mimic insects' ommatidia are fabricated. Self-aligned waveguides under the lenses are created after exposing photoresist SU-8 film through the negative polydimethylsiloxane (PDMS) lens array. Instead of drying from the developer, the waveguides are coated with poly(vinyl alcohol) and then immersed into a mixture of PDMS precursor and diethyl ether. The slow drying of diethyl ether, followed by curing and peeling off PDMS, allows for the fabrication of free-standing waveguides without collapse...
November 3, 2016: ACS Applied Materials & Interfaces
Zhao Dang, Libin Liu, Yan Li, Yu Xiang, Gailan Guo
The development of stimuli-responsive materials with the ability of controllable oil/water separation is crucial for practical applications. Here, a novel pH responsive nonfluorine-containing copolymer was designed. The copolymer together with silica can be dip-coated on different materials including cotton fabric, filter paper, and polyurethane foam. The coated materials exhibit switchable superhydrophilicity and superhydrophobicity and can be applied in continuous separation of oil/water/oil three phase mixtures, different surfactant stabilized emulsion (oil-in-water, water-in-oil, and oil-in-acidic water) as well as oil uptake and release via in situ and ex situ pH change...
November 3, 2016: ACS Applied Materials & Interfaces
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