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enhancer insulator

Jiyong Liang, Yizhuo Gu, Zhenchong Zhang, Shaokai Wang, Min Li, Zuoguang Zhang
The compacting structure of chlorine-doped continuous CNT sheet/polyvinylidene fluoride (Cl-CNT sheet/PVDF) was successfully optimized by means of hot-press treatment to improve mechanical and dielectric properties with high densification degree. Then, the densified Cl-CNT sheet/PVDF dielectric layer was inserted between two PVDF insulating layers to fabricate sandwich composite. It is found that the dielectric and mechanical properties are effectively enhanced, with the dielectric permittivity of 40.4 (@102 Hz), dielectric loss of 0...
November 17, 2017: Nanotechnology
R R Urkude, R Rawat, U A Palikundwar
We have performed a systematic parallel field magnetotransport studies of (Bi1-x Sb x )2Te3 to understand the temperature and impurity effect on the interference of bulk conductance on the surface states of highly insulating topologically insulating compound Bi2Te3. The compound exhibits a weak antilocalization effect (WAL) at low temperature and low magnetic field. WAL weakens and a weak localization effect is observed to be developed in the compound with the increase in temperature due to the creation of topologically trivial 2D electron gas states...
November 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Jie Song, Shuo Wu, Xinlan Yang, Jingli Yuan
Graphene nanodisks with good conductivity and plenty of edge sites were synthesized to load glucose oxidase (GRD-GOD) and coupled with a Mn(2+) doped CdS quantum dot (QD) modified TiO2 electrode (CdS:Mn/TiO2) for a highly sensitive photoelectrochemical (PEC) immunoassay. The specific immune-recognition behaviour can bring the GRD-GOD labelled antigen into the antibody immobilized CdS:Mn/TiO2 interface and dramatically enhance the photocurrent response via a dual signal amplification strategy. First, graphene nanodisks with a strong electron transfer capacity can improve the conductivity of both the insulating protein layers and the CdS:Mn/TiO2 matrix, thus facilitating the regeneration of trapped carriers and hot electrons in the CdS:Mn QD films and enhancing the PEC performance...
November 15, 2017: Analyst
Xiaoli Liu, Line Hagner Nielsen, Sylvia Natalie Klodzinska, Hanne Mørck Nielsen, Haiyan Qu, Lars Porskjær Christensen, Jukka Rantanen, Mingshi Yang
Wound dressings should ideally be able to maintain high humidity, remove excess wound exudate, permit thermal insulation, provide certain mechanical strength, and in some cases deliver antibiotics to prevent infections. Until now, none of the existing wound dressing products can meet all these requirements. To design a wound dressing with as many of the aforementioned features as possible, in this study, we attempted to prepare ciprofloxacin (CIP), an antibiotic, loaded electrospun hydrophobic poly (lactic-co-glycolic acid) (PLGA) fibrous mats modified with hydrophilic sodium alginate (ALG) microparticles...
November 9, 2017: European Journal of Pharmaceutics and Biopharmaceutics
Yunbo Ou, Chang Liu, Gaoyuan Jiang, Yang Feng, Dongyang Zhao, Weixiong Wu, Xiao-Xiao Wang, Wei Li, Canli Song, Li-Li Wang, Wenbo Wang, Weida Wu, Yayu Wang, Ke He, Xu-Cun Ma, Qi-Kun Xue
The quantum anomalous Hall (QAH) effect, which has been realized in magnetic topological insulators (TIs), is the key to applications of dissipationless quantum Hall edge states in electronic devices. However, investigations and utilizations of the QAH effect are limited by the ultralow temperatures needed to reach full quantization-usually below 100 mK in either Cr- or V-doped (Bi,Sb)2 Te3 of the two experimentally confirmed QAH materials. Here it is shown that by codoping Cr and V magnetic elements in (Bi,Sb)2 Te3 TI, the temperature of the QAH effect can be significantly increased such that full quantization is achieved at 300 mK, and zero-field Hall resistance of 0...
November 10, 2017: Advanced Materials
Youngjun Song, Sejung Kim, Michael J Heller
Recently, instead of indium tin oxide (ITO), the random mesh pattern of metallic nanowires for flexible transparent conducting electrodes (FTCEs) has received a great amount of interest due to its flexibility, low resistance, reasonable price and compliant processes. Mostly, nanowires for FTCEs are fabricated by spray or mayer coating methods. However, the metallic nanowires layer of FTCEs, which is fabricated by these methods, has spiked surface roughness and low junction contact between the nanowires that leads to their high sheet resistance value...
November 10, 2017: ACS Applied Materials & Interfaces
Amir Ghobadi, Hodjat Hajian, Sina Abedini Dereshgi, Berkay Bozok, Bayram Butun, Ekmel Ozbay
In this paper, we demonstrate a facile, lithography free, and large scale compatible fabrication route to synthesize an ultra-broadband wide angle perfect absorber based on metal-insulator-metal-insulator (MIMI) stack design. We first conduct a simulation and theoretical modeling approach to study the impact of different geometries in overall stack absorption. Then, a Pt-Al2O3 multilayer is fabricated using a single atomic layer deposition (ALD) step that offers high repeatability and simplicity in the fabrication step...
November 8, 2017: Scientific Reports
Limin Guo, Zhilin Chen, Shaoyi Lyu, Feng Fu, Siqun Wang
Cellulose nanofibril (CNF) aerogel is highly flammable and its mechanical strength is very soft, which is unfavourable due to safety concerns and impractical when used as the thermal insulation material. In this work, we used N-methylol dimethylphosphonopropionamide (MDPA) and 1,2,3,4-butanetetracarboxylic acid (BTCA) as co-additives and then prepared lightweight flame resistant CNF sponge-like aerogels via an eco-friendly freeze-drying and post cross-linking method. The CNF/BTCA/MDPA aerogel exhibited a better flame retardant performance, outstanding self-extinguishing behaviour and significantly increased char residue (by as much as 268%) compared with the neat CNF aerogel...
January 1, 2018: Carbohydrate Polymers
Lingling Jia, Kai Shan, Li-Long Pan, Ninghan Feng, Zhuwu Lv, Yajun Sun, Jiahong Li, Chengfei Wu, Hao Zhang, Wei Chen, Julien Diana, Jia Sun, Yong Q Chen
Recent evidence indicates that indigenous Clostridium species induce colonic regulatory T cells (Tregs), and gut lymphocytes are able to migrate to pancreatic islets in an inflammatory environment. Thus, we speculate that supplementation with the well-characterized probiotics Clostridium butyricum CGMCC0313.1 (CB0313.1) may induce pancreatic Tregs and consequently inhibit the diabetes incidence in non-obese diabetic (NOD) mice. CB0313.1 was administered daily to female NOD mice from 3 to 45 weeks of age. The control group received an equal volume of sterile water...
2017: Frontiers in Immunology
Ling Zhou, Qiuyun Fu, Fei Xue, Xiahui Tang, Dongxiang Zhou, Yahui Tian, Geng Wang, Chaohong Wang, Haibo Gou, Lei Xu
Flexible nanocomposites composed of high dielectric constant fillers and polymer matrix have shown great potential for electrostatic capacitors and energy storage applications. To obtain the composited material with high dielectric constant and high breakdown strength, multi-interfacial composited particles, which composed of conductive cores and insulating shells and possessed the internal barrier layer capacitor (IBLC) effect, were adopted as fillers. Thus, Fe3O4@BaTiO3 core-shell particles were prepared and loaded into the poly-(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) polymer matrix...
November 1, 2017: ACS Applied Materials & Interfaces
Takafumi Yamamoto, Dihao Zeng, Takateru Kawakami, Vaida Arcisauskaite, Kanami Yata, Midori Amano Patino, Nana Izumo, John E McGrady, Hiroshi Kageyama, Michael A Hayward
Transition-metal oxyhydrides are of considerable current interest due to the unique features of the hydride anion, most notably the absence of valence p orbitals. This feature distinguishes hydrides from all other anions, and gives rise to unprecedented properties in this new class of materials. Here we show via a high-pressure study of anion-ordered strontium vanadium oxyhydride SrVO2H that H(-) is extraordinarily compressible, and that pressure drives a transition from a Mott insulator to a metal at ~ 50 GPa...
October 31, 2017: Nature Communications
Youchen Hao, Dongbin Xiong, Wen Liu, Linlin Fan, Dejun Li, Xifei Li
An interlayer has been regarded as a promising mediator to prolong the life span of lithium sulfur batteries because its excellent absorbability to soluble polysulfide efficiently hinders the shuttle effect. Herein, we designed various interlayers and understand the working mechanism of an interlayer for lithium sulfur batteries in detail. It was found that the electrochemical performance of a S electrode for an interlayer located in cathode side is superior to the pristine one without interlayers. Surprisingly, the performance of the S electrode for an interlayer located in anode side is poorer than that of pristine one...
November 7, 2017: ACS Applied Materials & Interfaces
Noelle K Lebow, Lisa D DesRocher, Frank L Younce, Mei-Jun Zhu, Carolyn F Ross, Denise M Smith
Cold-smoked salmon (CSS) production lacks a validated kill step for Listeria monocytogenes. Although Listeria spp. are reduced by nisin or high-pressure processing (HPP), CSS muscle discoloration is often observed after HPP. Effects of nisin and low-temperature HPP on L. innocua survival (nonpathogenic surrogate for L. monocytogenes), spoilage organism growth, color, and sensory preference and peelability of CSS were studied. Cold-smoked sockeye salmon (Oncorhynchus nerka) fillets ± nisin (10 μg/g) were inoculated with a 3-strain L...
October 30, 2017: Journal of Food Science
M Farhat, S Kais, F H Alharbi
Solar-cells based on Schottky junctions between metals and semiconductors (without or with an intermediate insulator) are among the main possibilities towards economical photovoltaic conversion of the solar energy. This is mainly due to their structural simplicity and hence the ease of their realization. We propose here a new kind of light-harvesting devices using plasmonic nano-antenna gratings, that enhance the absorption of light over a broadband spectrum, and permit the reduction of thickness of the cell dramatically, with efficiency around 15% for 3 micrometers ultra-thin Silicon cell...
October 27, 2017: Scientific Reports
Woo Seok Lee, Seung-Wook Lee, Hyungmok Joh, Mingi Seong, Haneun Kim, Min Su Kang, Ki-Hyun Cho, Yun-Mo Sung, Soong Ju Oh
All-solution processed, high-performance wearable strain sensors are demonstrated using heterostructure nanocrystal (NC) solids. By incorporating insulating artificial atoms of CdSe quantum dot NCs into metallic artificial atoms of Au NC thin film matrix, metal-insulator heterostructures are designed. This hybrid structure results in a shift close to the percolation threshold, modifying the charge transport mechanism and enhancing sensitivity in accordance with the site percolation theory. The number of electrical pathways is also manipulated by creating nanocracks to further increase its sensitivity, inspired from the bond percolation theory...
October 27, 2017: Small
Ming Yang, Yong Zheng Luo, Ming Gang Zeng, Lei Shen, Yun Hao Lu, Jun Zhou, Shi Jie Wang, Iam Keong Sou, Yuan Ping Feng
A large bulk band gap and tunable Dirac carriers are desired for practical device applications of topological insulators. However, most known topological insulators are narrow gap materials and the manipulation of their Dirac surface states is limited by residual bulk charge carriers originating from intrinsic defects. In this study, via density functional theory based first-principles calculations, we predict that a layered hexagonal structure of Bi2S3 is stable, and it becomes a topological insulator under a moderate compressive pressure of about 5...
November 8, 2017: Physical Chemistry Chemical Physics: PCCP
Hee Jung Yang, Jin Zhang, Wensheng Yan, Seong-Jun Cho, Christopher Lucchesi, Mingyi Chen, Eric C Huang, Ariane Scoumanne, Weici Zhang, Xinbin Chen
WT p53 is critical for tumor suppression, whereas mutant p53 promotes tumor progression. Nerve injury-induced protein 1 (Ninj1) is a target of p53 and forms a feedback loop with p53 by repressing p53 mRNA translation. Here, we show that loss of Ninj1 increased mutant p53 expression and, subsequently, enhanced cell growth and migration in cells carrying a mutant p53. In contrast, loss of Ninj1 inhibited cell growth and migration in cells carrying a WT p53. To explore the biological significance of Ninj1, we generated a cohort of Ninj1-deficient mice and found that Ninj1(+/-) mice were prone to systemic inflammation and insulitis, but not to spontaneous tumors...
October 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
Rajashri Urkude, Rajeev Rawat, Umesh Palikundwar
We have performed a systematic parallel field magnetotransport studies of (Bi<sub>1-x</sub>Sb<sub>x</sub>)<sub>2</sub>Te<sub>3</sub> to understand the temperature and impurity effect on interference of bulk conductance on the surface states of highly insulating topologically insulating compound Bi2Te<sub>3</sub>. The compound exhibits a weak antilocalization effect (WAL) at low temperature and low magnetic field. WAL weakens and weak localization (WL) effect is observed to be developed in the compound with the increase in the temperature due to the creation of topologically trivial 2D electron gas (2DEG) states...
October 26, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Davide Brivio, Erno Sajo, Piotr Zygmanski
PURPOSE: We developed a method for measuring signal enhancement produced by high-Z nanofilm electrodes in parallel plate ionization chambers with variable thickness micro-gaps. METHODS: We used a laboratory-made variable-gap parallel-plate ionization chamber with nanofilm electrodes made of Aluminum-Aluminum (Al-Al) and Aluminum-Tantalum (Al-Ta). The electrodes were evaporated on 1 mm thick glass substrates. The inter-electrode air gap was varied from 3 μm to 1 cm...
October 26, 2017: Medical Physics
Leslie Embrey, Pranjal Nautiyal, Archana Loganathan, Adeyinka Idowu, Benjamin Boesl, Arvind Agarwal
Three-dimensional (3D) macroporous graphene foam based multifunctional epoxy composites are developed in this study. Facile dip-coating and mold-casting techniques are employed to engineer microstructures with tailorable thermal, mechanical, and electrical properties. These processing techniques allow capillarity-induced equilibrium filling of graphene foam branches, creating epoxy/graphene interfaces with minimal separation. Addition of 2 wt % graphene foam enhances the glass transition temperature of epoxy from 106 to 162 °C, improving the thermal stability of the polymer composite...
November 2, 2017: ACS Applied Materials & Interfaces
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