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ACS Applied Materials & Interfaces

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https://www.readbyqxmd.com/read/28930438/supported-planar-mammalian-membranes-as-models-of-in-vivo-cell-surface-architectures
#1
Han-Yuan Liu, Hannah Grant, Hung-Lun Hsu, Raya Sorkin, Filip Bošković, G J L Wuite, Susan Daniel
Emerging technologies use cell plasma membrane vesicles or 'blebs' as an intermediate to form molecularly complete, planar cell surface mimetics that are compatible with a variety of characterization tools and microscopy methods. This approach enables direct incorporation of membrane proteins into supported lipid bilayers without using detergents and reconstitution and preserves native lipids and membrane species. Such a system can be advantageous as in vitro models of in vivo cell surfaces for study of the roles of membrane proteins as drug targets in drug delivery, host-pathogen interactions, tissue engineering, and many other bioanalytical and sensing applications...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28930434/enhanced-electrocatalytic-oxygen-reduction-on-niwox-solid-solution-with-induced-oxygen-defects
#2
Meiqin Shi, Xue Tong, Wang Li, Jun Fang, Li-Tao Chen, Chun-An Ma
The continuous solid solution NiWOx is successfully prepared by using precursor W18O49 with plenty of oxygen defects. The NiWOx nanoparticles are characterized by X-ray diffraction, High resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The crystallographic phase of NiWOx is stable and characterized by the same feature of the parent lattice W18O49 even with various concentration of dopant Ni which indicates the existence of oxygen defects. The NiWOx nanoparticles could be processed as the appropriate promoter after loading 10 wt% Pt...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28930432/injectable-stem-cell-laden-open-porous-microgels-that-favour-adipogenesis-in-vitro-and-in-vivo-evaluation
#3
Pengfei Xia, Kunxi Zhang, Yan Gong, Guifei Li, Shifeng Yan, Jingbo Yin
Microgels, with large surface area per volume, show great advantages in adipose tissue engineering due to their injectability and similarity with natural extracellular matrix. However, to date, no studies have tried applying microgels to adipose tissue regeneration. Herein, based on double bonded poly-(L-glutamic acid)-g-2-Hydroxyethyl methacrylate (PLGA-g-HEMA) and maleic anhydride-modified chitosan (MCS), an open porous microgel with high hydrophilicity and great injectability is successfully prepared (microgels diameter of 200-300 μm, pore diameter of 38 μm, and porosity of 88...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929746/atomic-layer-deposition-of-rhenium-aluminum-oxide-thin-films-and-reox-incorporation-in-a-metal-organic-framework
#4
Martino Rimoldi, Joseph T Hupp, Omar K Farha
Methyltrioxorhenium (ReO3Me) is introduced as the first rhenium atomic layer deposition (ALD) precursor and used to grow rhenium aluminum oxide thin films in combination with trimethylaluminum (TMA - AlMe3). The growth rate of the smooth Re-Al oxide films, with general stoichiometry RexAlyO3x, has been monitored by in situ quartz crystal microbalance (QCM) and ex situ ellipsometry, and found to be 3.2 Å/cycle. X-ray photoelectron spectroscopy (XPS) revealed the mixed valent composition of the film with Re(III) species being the main component...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929745/stabilization-of-polyoxometalate-water-oxidation-catalysts-on-hematite-by-atomic-layer-deposition
#5
Sarah M Lauinger, Brandon Deane Piercy, Wei Li, Qiushi Yin, Daniel Lynn Collins-Wildman, Elliot N Glass, Mark D Losego, Dunwei Wang, Yurii V Geletii, Craig L Hill
Fast and earth-abundant-element polyoxometalates (POMs) have been heavily studied recently as water oxidation catalysts (WOCs) in homogeneous solution. However, POM WOCs can be quite unstable when supported on electrode or photoelectrode surfaces under applied potential. This article reports for the first time that a nanoscale oxide coating (Al2O3) applied by atomic layer deposition (ALD) aids immobilization and greatly stabilizes this now large family of molecular WOCs when on electrode surfaces. In this study, [{RuIV4(OH)2(H2O)4}(γ-SiW10O34)2]10- (Ru4Si2) is supported on hematite photoelectrodes, then protected by ALD Al2O3, and this ternary system was characterized before and after photoelectrocatalytic water oxidation by FTIR, XPS, EDX and voltammetry...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929741/visible-light-neural-stimulation-on-graphitic-carbon-nitride-graphene-photocatalytic-fibers
#6
Zhongyang Zhang, Ruodan Xu, Zegao Wang, Mingdong Dong, Bianxiao Cui, Menglin Chen
Light stimulation allows remote and spatiotemporally accurate operation that has been applied as effective, non-invasive means of therapeutic interventions. Here, visible light neural stimulation of graphitic carbon nitride (g-C3N4), an emerging photocatalyst with visible-light optoelectronic conversion, was for the first time investigated. Specifically, g-C3N4 was combined with graphene oxide (GO) in a 3D manner on the surfaces of electrospun polycaprolactone/gelatin (PG) fibers and functioned as a biocompatible interface for visible-light stimulating neuronal differentiation...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929738/plasmonic-effects-of-metallic-nanoparticles-on-enhancing-performance-of-perovskite-solar-cells
#7
Qi Luo, Chenxi Zhang, Xueshuang Deng, Hongbing Zhu, Zhiqiang Li, Zengbo Wang, Xiaohong Chen, Sumei Huang
We report the systematic design and formation of plasmonic perovskite solar cells (PSCs) by integrating Au@TiO2 core-shell nanoparticles (NPs) into porous TiO2 and/or perovskite semiconductor capping layers. The plasmonic effects in the formed PSCs are examined. The most efficient configuration is obtained by incorporating Au@TiO2 NPs into both the porous TiO2 and the perovskite capping layers, which increases the power conversion efficiency (PCE) from 12.59 % to 18.24 %, demonstrating over 44% enhancement, compared with the reference device without the metal NPs...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929737/two-dimensional-magnetic-semiconductor-in-feroxyhyte-%C3%AE-feooh
#8
Imran Khan, Arqum Hashmi, M Umar Farooq, Jisang Hong
A few years ago, it was claimed that the two-dimensional (2D) feroxyhyte (δ-FeOOH) layer could possess a net magnetic moment and it could be applied for potential spintronics application because it showed a band gap. However, the exact crystal structure is still unknown. Hereby, we investigate the crystal structure, electronic band structure, magnetic and optical properties of 2D δ-FeOOH using density functional calculations. Based on the experimental observation and dynamical stability calculations, we propose that the 2D δ-FeOOH originates from a bulk Fe(OH)2 via oxidation...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929736/substrate-versatile-approach-to-robust-antireflective-and-superhydrophobic-coatings-with-excellent-self-cleaning-property-in-varied-environments
#9
Tingting Ren, Junhui He
Robust antireflective and superhydrophobic coatings are highly desired in wide applications, such as optical devices, solar cell panels, architectural and automotive glasses, lab-on chip systems, and windows for electronic devices. Meanwhile, simple, low-cost, and substrate-versatile fabrication is also essential toward real applications of such coatings. Herein, we developed a substrate-versatile strategy to fabricate robust antireflective and superhydrophobic coatings with excellent self-cleaning property in varied environments, including air and oil and after oil contamination...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929733/energy-level-alignment-of-n-doping-fullerenes-and-fullerene-derivatives-using-air-stable-dopant
#10
Qinye Bao, Xianjie Liu, Slawomir Braun, Yanqing Li, Jian-Xin Tang, Chun-Gang Duan, Mats Fahlman
Doping has been proved to be one of the powerful technologies to achieve significant improvement in organic electronic device performance. Herein, we systematically map out the interface properties of solution processed air stable n-type 4-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)phenyl (DMBI) doping fullerenes and fullerene derivatives, and establish an universal energy level alignment scheme for this class of n-doped system. At low doping levels where the charge transfer doping induces mainly bound charges, the energy level alignment of the n-doping organic semiconductor can be described by combining integer charger transfer (ICT)-induced shifts with a so-called double dipole step...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929732/highly-durable-self-standing-solid-state-supercapacitor-based-on-an-ionic-liquid-rich-ionogel-and-porous-carbon-nanofiber-electrodes
#11
Silas K Simotwo, Parameswara Rao Chinnam, Stephanie L Wunder, Vibha Kalra
A high-performance, self-standing solid-state supercapacitor is prepared by incorporating an ionic liquid (IL)-rich ionogel made with 95 wt % IL (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) and 5 wt % methyl cellulose, a polymer matrix, into highly interconnected 3-D activated carbon nanofiber (CNF) electrodes. The ionogel exhibits strong mechanical properties with a storage modulus of 5 MPa and a high ionic conductivity of 5.7 mS cm(-1) at 25 °C. The high-surface-area CNF-based electrode (2282 m(2) g(-1)), obtained via an electrospinning technique, exhibits hierarchical porosity generated both in situ during pyrolysis and ex situ via KOH activation...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28927267/atomistic-origins-of-high-capacity-and-high-structural-stability-of-polymer-derived-sioc-anode-materials
#12
Hong Sun, Kejie Zhao
Capacity and structural stability are often mutually exclusive properties of electrodes in Li-ion batteries: A gain in capacity is usually accompanied by the undesired large volumetric change of the host material upon lithiation. Polymer-derived ceramics, such as silicon oxycarbide (SiOC) of hybrid Si-O-C bonds, show an exceptional combination of high capacity and superior structural stability. We investigate the atomistic origins of the unique chemomechanical performance of carbon-rich SiOC using the first-principles theoretical approach...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28901125/annealing-induced-morphology-of-silver-nanoparticles-on-pyramidal-silicon-surface-and-their-application-to-surface-enhanced-raman-scattering
#13
Abhijit Roy, Arpan Maiti, Tapas Kumar Chini, Biswarup Satpati
This paper reports on a simple and cost-effective process of developing a stable surface-enhanced Raman scattering (SERS) substrate based on silver (Ag) nanoparticles deposited on silicon (Si) surface. Durability is an important issue for preparing SERS active substrate as silver nanostructures are prone to rapid surface oxidation when exposed to ambient conditions, which may result in the loss of the enhancement capabilities in a short period of time. Here, we employ the galvanic displacement method to produce Ag nanoparticles on Si(100) substrate prepatterned with arrays of micropyramids by chemical etching, and subsequently, separate pieces of such substrates were annealed in oxygen and nitrogen environments at 550 °C...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28901124/understanding-and-tailoring-grain-growth-of-lead-halide-perovskite-for-solar-cell-application
#14
Yongchao Ma, Yanliang Liu, Insoo Shin, In-Wook Hwang, Yun Kyung Jung, Jung Hyun Jeong, Sung Heum Park, Kwang Ho Kim
The fundamental mechanism of grain growth evolution in the fabrication process from the precursor phase to the perovskite phase is not fully understood despite its importance in achieving high-quality grains in organic-inorganic hybrid perovskites, which are strongly affected by processing parameters. In this work, we investigate the fundamental conversion mechanism from the precursor phase of perovskite to the complete perovskite phase and how the intermediate phase promotes growth of the perovskite grains during the fabrication process...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28895718/cold-crystallization-of-glassy-polylactide-during-solvent-crazing
#15
Elena S Trofimchuk, Alexander V Efimov, Tatiana E Grokhovskaya, Nina I Nikonorova, Marina A Moskvina, Nikita G Sedush, Pavel V Dorovatovskii, Olga A Ivanova, Ekaterina G Rukhlya, Aleksandr L Volynskii, Sergey N Chvalun
Uniaxial tension accompanied by the orientation and crystallization of polymer chains is one of the powerful methods for the improvement of mechanical properties. Crystallization of amorphous isotropic polylactide (PLA) at room temperature is studied for the first time during the drawing of films in the presence of liquid adsorption-active media (ethanol, water-ethanol mixtures, and n-heptane) by the solvent crazing mechanism. The crystalline structure arises only under simultaneous actions of a liquid medium and a tensile stress and does not depend on the nature of the environment...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28895396/hybrid-wse2-in2o3-phototransistor-with-ultrahigh-detectivity-by-efficient-suppression-of-dark-currents
#16
Nan Guo, Fan Gong, Junku Liu, Yi Jia, Shaofan Zhao, Lei Liao, Meng Su, Zhiyong Fan, Xiaoshuang Chen, Wei Lu, Lin Xiao, Weida Hu
Photodetectors based on low-dimensional materials have attracted tremendous attention because of their high sensitivity and compatibility with conventional semiconductor technology. However, up until now, developing low-dimensional phototransistors with high responsivity and low dark currents over broad-band spectra still remains a great challenge because of the trade-offs in the potential architectures. In this work, we report a hybrid phototransistor consisting of a single In2O3 nanowire as the channel material and a multilayer WSe2 nanosheet as the decorating sensitizer for photodetection...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28885005/mof-mediated-destruction-of-cancer-using-the-cell-s-own-hydrogen-peroxide
#17
Hadi Ranji-Burachaloo, Fatemeh Karimi, Ke Xie, Qiang Fu, Paul A Gurr, Dave E Dunstan, Greg G Qiao
A novel reduced iron metal-organic framework nanoparticle with cytotoxicity specific to cancer cells is presented. This nanoparticle was prepared via a hydrothermal method, reduced using hydroquinone, and finally conjugated with folic acid (namely, rMOF-FA). The synthesized nanoparticle shows the controlled release of iron in an acidic ex-vivo environment. Iron present on the rMOF-FA and released into solution can react with high levels of hydrogen peroxide found specifically in cancer cells to increase the hydroxyl radical concentration...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28880534/synthesis-and-characterization-of-alkylamine-functionalized-si-111-for-perovskite-adhesion-with-minimal-interfacial-oxidation-or-electronic-defects
#18
Alexander D Carl, Roghi E Kalan, John David Obayemi, Martiale Gaetan Zebaze Kana, Winston Oluwole Soboyejo, Ronald L Grimm
We investigated synthetic strategies for the functionalization of Si(111) surfaces with organic species containing amine moieties. We employed the functionalized surfaces to chemically "glue" perovskites to silicon with efficient electron transfer and minimal oxidation leading to deleterious recombination at the silicon substrate. A two-step halogenation-alkylation reaction produced a mixed allyl-methyl monolayer on Si(111). Subsequent reactions utilized multiple methods of brominating the allyl double bond including reaction with HBr in acetic acid, HBr in THF, and molecular bromine in dichloromethane...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28857538/tempo-appended-metal-organic-frameworks-as-highly-active-selective-and-reusable-catalysts-for-mild-aerobic-oxidation-of-alcohols
#19
Krzysztof M Zwoliński, Michał J Chmielewski
Metal-organic frameworks (MOFs) decorated with stable organic radicals are highly promising materials for redox catalysis. Unfortunately however, the synthesis of chemically robust MOFs typically requires harsh solvothermal conditions, which are not compatible with organic radicals. Here, we describe the synthesis of two isoreticular families of stable, mixed component, zirconium MOFs with UiO-66 and UiO-67 structures and controlled amounts of covalently attached TEMPO radicals. The materials were obtained using a relatively low-temperature, HCl-modulated de novo method developed by Hupp and Farha and shown to contain large amounts of missing cluster defects, forming nanodomains of the reo phase with 8-connected clusters...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28849648/rational-design-of-cobalt-iron-selenides-for-highly-efficient-electrochemical-water-oxidation
#20
Jun-Ye Zhang, Lin Lv, Yifan Tian, Zhishan Li, Xiang Ao, Yucheng Lan, Jianjun Jiang, Chundong Wang
Exploring active, stable, earth-abundant, low-cost, and high-efficiency electrocatalysts is highly desired for large-scale industrial applications toward the low-carbon economy. In this study, we apply a versatile selenizing technology to synthesize Se-enriched Co1-xFexSe2 catalysts on nickel foams for oxygen evolution reactions (OERs) and disclose the relationship between the electronic structures of Co1-xFexSe2 (via regulating the atom ratio of Co/Fe) and their OER performance. Owing to the fact that the electron configuration of the Co1-xFexSe2 compounds can be tuned by the incorporated Fe species (electron transfer and lattice distortion), the catalytic activity can be adjusted according to the Co/Fe ratios in the catalyst...
September 20, 2017: ACS Applied Materials & Interfaces
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