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enhancer insulator

Jiazhen He, Yehu Lu, Yan Chen, Jun Li
In addition to direct thermal energy from a heating source, a large amount of thermal energy stored in clothing will continuously discharge to skin after exposure. Investigating the thermal hazardous effect of clothing caused by stored energy discharge is crucial for the reliability of thermal protective clothing. In this study several indices were proposed and applied to evaluate the impact of thermal energy discharge on human skin. The heat discharge from different layers of fabric systems was investigated, and the influences of air gaps and applied compression were examined...
May 10, 2017: Journal of Hazardous Materials
Elphège P Nora, Anton Goloborodko, Anne-Laure Valton, Johan H Gibcus, Alec Uebersohn, Nezar Abdennur, Job Dekker, Leonid A Mirny, Benoit G Bruneau
The molecular mechanisms underlying folding of mammalian chromosomes remain poorly understood. The transcription factor CTCF is a candidate regulator of chromosomal structure. Using the auxin-inducible degron system in mouse embryonic stem cells, we show that CTCF is absolutely and dose-dependently required for looping between CTCF target sites and insulation of topologically associating domains (TADs). Restoring CTCF reinstates proper architecture on altered chromosomes, indicating a powerful instructive function for CTCF in chromatin folding...
May 18, 2017: Cell
Sonia Kundu, Aatrayee Das, Aalok Basu, Md Farooque Abdullah, Arup Mukherjee
This work relates to guar gum benzoate self assembly nanoparticles synthesis and nano composite films development with gelatin. Guar gum benzoate was synthesized in a Hofmeister cation guided homogeneous phase reaction. Self assembly polysaccharide nanoparticles were prepared in solvent displacement technique. Electron microscopy and DLS study confirmed uniform quasi spherical nanoparticles with ζ-potential - 28.7mV. Nanocomposite films were further developed in gelatin matrix. The film capacity augmenting due to nanoparticles incorporation was noteworthy...
August 15, 2017: Carbohydrate Polymers
Yinting Wong, Dan Zhong, Aotian Song, Yan Hu
This manuscript proposes a soft-chemistry method to develop superhydrophobic and highly IR-reflective hollow glass microspheres (HGM). The anatase TiO2 and a superhydrophobic agent were coated on the HGM surface in one step. TBT and PFOTES were selected as the Ti source and the superhydrophobic agent, respectively. They were both coated on the HGM, and after the hydrothermal process, the TBT turned to anatase TiO2. In this way, a PFOTES/TiO2-coated HGM (MCHGM) was prepared. For comparison, PFOTES single-coated HGM (F-SCHGM) and TiO2 single-coated HGM (Ti-SCHGM) were synthesized as well...
April 26, 2017: Journal of Visualized Experiments: JoVE
Zengji Yue, Gaolei Xue, Juan Liu, Yongtian Wang, Min Gu
Holography has extremely extensive applications in conventional optical instruments spanning optical microscopy and imaging, three-dimensional displays and metrology. To integrate holography with modern low-dimensional electronic devices, holograms need to be thinned to a nanometric scale. However, to keep a pronounced phase shift modulation, the thickness of holograms has been generally limited to the optical wavelength scale, which hinders their integration with ultrathin electronic devices. Here, we break this limit and achieve 60 nm holograms using a topological insulator material...
May 18, 2017: Nature Communications
Longbin Qiu, Luis K Ono, Yan Jiang, Matthew R Leyden, Sonia R Raga, Shenghao Wang, Yabing Qi
The rapid rise of power conversion efficiency (PCE) of low cost organometal halide perovskite solar cells suggests that these cells are a promising alternative to conventional photovoltaic technology. However, anomalous hysteresis and unsatisfactory stability hinder the industrialization of perovskite solar cells. Interface engineering is of importance for the fabrication of highly stable and hysteresis free perovskite solar cells. Here we report that a surface modification of the widely used TiO2 compact layer can give insight into interface interaction in perovskite solar cells...
May 17, 2017: Journal of Physical Chemistry. B
Chi-Hsin Huang, Wen-Chih Chang, Jian-Shiou Huang, Shih-Ming Lin, Yu-Lun Chueh
Core-shell NWs offer an innovative approach to achieve nanoscale metal-insulator-metal (MIM) heterostructures along the wire radial direction, realizing three-dimensional geometry architecture rather than planar type thin film devices. This work demonstrated the tunable resistive switching characteristics of ITO/HfO2 core-shell nanowires with controllable shell thicknesses by the atomic layer deposition (ALD) process for the first time. Compared to planar HfO2 thin film device configuration, ITO/HfO2 core-shell nanowire shows a prominent resistive memory behavior, including lower power consumption with a smaller SET voltage of ∼0...
May 16, 2017: Nanoscale
Teguh Citra Asmara, Dongyang Wan, Yongliang Zhao, Muhammad Aziz Majidi, Christopher T Nelson, Mary C Scott, Yao Cai, Bixing Yan, Daniel Schmidt, Ming Yang, Tao Zhu, Paolo E Trevisanutto, Mallikarjuna R Motapothula, Yuan Ping Feng, Mark B H Breese, Matthew Sherburne, Mark Asta, Andrew Minor, T Venkatesan, Andrivo Rusydi
Plasmonics has attracted tremendous interests for its ability to confine light into subwavelength dimensions, creating novel devices with unprecedented functionalities. New plasmonic materials are actively being searched, especially those with tunable plasmons and low loss in the visible-ultraviolet range. Such plasmons commonly occur in metals, but many metals have high plasmonic loss in the optical range, a main issue in current plasmonic research. Here, we discover an anomalous form of tunable correlated plasmons in a Mott-like insulating oxide from the Sr1-xNb1-yO3+δ family...
May 12, 2017: Nature Communications
Dong Hun Sin, Sae Byeok Jo, Seung Goo Lee, Hyomin Ko, Min Kim, Hansol Lee, Kilwon Cho
A mechanically and thermally stable and electron-selective ZnO/CH3NH3PbI3 interface is created via hybridization of a polar insulating polymer, poly(ethylene glycol) (PEG), into ZnO nanoparticles (NPs). PEG successfully passivates the oxygen defects on ZnO and prevents direct contact between CH3NH3PbI3 and defects on ZnO. A uniform CH3NH3PbI3 film is formed on a soft ZnO:PEG layer after dispersion of the residual stress from the volume expansion during CH3NH3PbI3 conversion. PEG also increases the work of adhesion of the CH3NH3PbI3 film on the ZnO:PEG layer and holds the CH3NH3PbI3 film with hydrogen bonding...
May 19, 2017: ACS Applied Materials & Interfaces
Liang Zhang, Ben-Chuan Lin, Yan-Fei Wu, Han-Chun Wu, Tsung-Wei Huang, Ching-Ray Chang, Xiaoxing Ke, Mert Kurttepeli, Gustaaf Van Tendeloo, Jun Xu, Dapeng Yu, Zhi-Min Liao
It has been theoretically proposed that the spin textures of surface states in a topological insulator can be directly transferred to graphene by means of the proximity effect, which is very important for realizing a two-dimensional topological insulator based on graphene. Here we report the anomalous magnetotransport properties of graphene-topological insulator Bi2Se3 heterojunctions, which are sensitive to the electronic coupling between graphene and the topological surface state. The coupling between the pz orbitals of graphene and the p orbitals of the surface states on the Bi2Se3 bottom surface can be enhanced by applying a perpendicular negative magnetic field, resulting in a giant negative magnetoresistance at the Dirac point up to about -91%...
May 16, 2017: ACS Nano
Andrew Gaul, Qing Peng, David J Singh, Ganpati Ramanath, Theodorian Borca-Tasciuc
First-principles calculations revealing insulator-to-metal transitions in Bi2Te3 and Bi2Te2Se, at 9 GPa and 12.5 GPa, respectively, match with prior experiments. Our electronic band structure calculations and accompanying Boltzmann transport calculations of thermoelectric properties for Bi2-xSbxTe2-ySey alloys explain and predict large power factor changes induced by pressure. Complex band degeneracy changes preceding insulator-to-metal transitions significantly alter the density of states near the Fermi level, and foster the disentangling of the unfavorable coupling between Seebeck coefficient and electrical conductivity...
May 9, 2017: Physical Chemistry Chemical Physics: PCCP
Peng Li, Chuan Xia, Jun Li, Zhiyong Zhu, Yan Wen, Qiang Zhang, Junwei Zhang, Yong Peng, Husam N Alshareef, Xixiang Zhang
The coexistence of ferromagnetic metallic phase and antiferromagnetic insulating phase in nanoscaled inhomogeneous perovskite oxides accounts for the colossal magnetoresistance. Although the model of spin-polarized electron transport across antiphase boundaries has been commonly employed to account for large magnetoresistance (MR) in ferrites, the magnetic anomalies, the two magnetic phases and enhanced molecular moment, are still unresolved. We observed a sizable MR in epitaxial spinel films (NiCo2O4-δ) that is much larger than that commonly observed in spinel ferrites...
May 10, 2017: ACS Nano
Yang Li, Hang Li, Qiyang Xiong, Xiaoming Wu, Jia Zhou, Jinzhu Wu, Xiaohong Wu, Wei Qin
An environmentally friendly atomic layer deposition (ALD) method with excellent atomic scale roughness controllability is developed to fabricate a highly conformal, corrosion preventive and conducting Al doped ZnO (AZO) film on a plasma electrolytic oxidation (PEO) layer coated AZ31 magnesium alloy. Compared with the insulated PEO coated magnesium alloy, the electrical conductivity of the composite coating increases to 25 S m(-1), and in the meantime the anticorrosion performance of the PEO/AZO coating is greatly improved compared to the bare Mg alloy...
May 5, 2017: Nanoscale
Luca De' Medici
Hund's coupling is shown to generally favor, in a doped half-filled Mott insulator, an increase in the compressibility culminating in a Fermi-liquid instability towards phase separation. The largest effect is found near the frontier between an ordinary and an orbitally decoupled ("Hund's") metal. The increased compressibility implies an enhancement of quasiparticle scattering, thus favoring other possible symmetry breakings. This physics is shown to happen in simulations of the 122 Fe-based superconductors, possibly implying the relevance of this mechanism in the enhancement of the critical temperature for superconductivity...
April 21, 2017: Physical Review Letters
Yehong Cheng, Shanbao Zhou, Ping Hu, Guangdong Zhao, Yongxia Li, Xinghong Zhang, Wenbo Han
Graphene aerogels with high surface areas, ultra-low densities and thermal conductivities have been prepared to exploit their wide applications from pollution adsorption to energy storage, supercapacitor, and thermal insulation. However, the low mechanical properties, poor thermal stability and electric conductivity restrict these aerogels' applications. In this paper, we prepared mechanically strong graphene aerogels with large BET surface areas, low thermal conductivities, high thermal stability and electric conductivities via hydrothermal reduction and supercritical ethanol drying...
May 3, 2017: Scientific Reports
Chuan Zhao, Tenzin Norden, Peiyao Zhang, Puqin Zhao, Yingchun Cheng, Fan Sun, James P Parry, Payam Taheri, Jieqiong Wang, Yihang Yang, Thomas Scrace, Kaifei Kang, Sen Yang, Guo-Xing Miao, Renat Sabirianov, George Kioseoglou, Wei Huang, Athos Petrou, Hao Zeng
Exploiting the valley degree of freedom to store and manipulate information provides a novel paradigm for future electronics. A monolayer transition-metal dichalcogenide (TMDC) with a broken inversion symmetry possesses two degenerate yet inequivalent valleys, which offers unique opportunities for valley control through the helicity of light. Lifting the valley degeneracy by Zeeman splitting has been demonstrated recently, which may enable valley control by a magnetic field. However, the realized valley splitting is modest (∼0...
May 1, 2017: Nature Nanotechnology
Feng Wu, Yu-Sheng Ye, Jia-Qi Huang, Teng Zhao, Ji Qian, Yuan-Yuan Zhao, Li Li, Lei Wei, Rui Luo, Yong-Xin Huang, Yi Xing, Ren-Jie Chen
The behavior of two-dimensional (2D) materials for energy storage systems relates to their morphology and physicochemical properties. Although various 2D materials can be found in different fields, the open access of these materials has greatly hampered their practical applications, such as in lithium-sulfur (Li-S) batteries, where the soluble intermediates should be controlled. Here, we have developed a facile approach to prepare 2D ultrathin interconnected carbon fabrics (ICFs) with "bubble-like" morphology and abundant mesopores using a "blowing bubble" method...
May 1, 2017: ACS Nano
Svetlana Pylaeva, Konstantin L Ivanov, Marc Baldus, Daniel Sebastiani, Hossam Elgabarty
Dynamic nuclear polarization (DNP), a technique that significantly enhances NMR signals, is experiencing a renaissance owing to enormous methodological developments. In the heart of DNP is a polarization transfer mechanism that endows nuclei with much larger electronic spin polarization. Polarization transfer via the Overhauser effect (OE) is traditionally known to be operative only in liquids and conducting solids. Very recently, surprisingly strong OE-DNP in insulating solids has been reported, with a DNP efficiency that increases with the magnetic field strength...
April 28, 2017: Journal of Physical Chemistry Letters
Nidia Lauzon, Martin Dufresne, Alexandre Beaudoin, Pierre Chaurand
Silver-assisted laser desorption ionization (AgLDI) imaging mass spectrometry (IMS) has been demonstrated to be a useful technology for fingermark analysis allowing for the detection of several classes of endogenous as well as exogenous compounds. Ideally, in IMS analyses, the fingermarks are deposited under controlled conditions on metallized conductive target slides. However, in forensic investigations, fingermarks are often found on a variety of non-conductive surfaces. A sputtered silver layer renders the target surface conductive, which allows the analyses of insulating surfaces by time-of-flight (TOF) IMS...
April 26, 2017: Journal of Mass Spectrometry: JMS
Awabaikeli Rousuli, Hitoshi Sato, Fumitoshi Iga, Kento Hayashi, Katsuya Ishii, Toru Wada, Toshiki Nagasaki, Kojiro Mimura, Hiroaki Anzai, Katsuya Ichiki, Shigenori Ueda, Akihiro Kondo, Koichi Kindo, Toshiro Takabatake, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi
We have carried out hard x-ray photoemission spectroscopy (HAXPES) of Yb<sub>1-x</sub>Zr<sub>x</sub>B<sub>12</sub> (0 ≤ x ≤ 0.875) to study the effects of electron doping on the Kondo insulator YbB<sub>12</sub>. The Yb valences of Yb<sub>1-x</sub>Zr<sub>x</sub>B<sub>12</sub> at 300 K estimated from the Yb 3d HAXPES spectra decreased after substituting Yb with Zr from 2.93 for YbB<sub>12</sub> to 2.83 for Yb<sub>0...
April 26, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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