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https://www.readbyqxmd.com/read/28336835/improving-powder-magnetic-core-properties-via-application-of-thin-insulating-silica-nanosheet-layers-on-iron-powder-particles
#1
Toshitaka Ishizaki, Hideyuki Nakano, Shin Tajima, Naoko Takahashi
A thin, insulating layer with high electrical resistivity is vital to achieving high performance of powder magnetic cores. Using layer-by-layer deposition of silica nanosheets or colloidal silica over insulating layers composed of strontium phosphate and boron oxide, we succeeded in fabricating insulating layers with high electrical resistivity on iron powder particles, which were subsequently used to prepare toroidal cores. The compact density of these cores decreased after coating with colloidal silica due to the substantial increase in the volume, causing the magnetic flux density to deteriorate...
December 23, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28333439/a-top-down-strategy-to-synthesize-mesoporous-dual-carbon-armored-mno-nanoparticles-for-lithium-ion-battery-anodes
#2
Wei Zhang, Jiannian Li, Jie Zhang, Jinzhi Sheng, Ting He, Meiyue Tian, Yufeng Zhao, Changjun Xie, Liqiang Mai, Shichun Mu
To overcome inferior rate capability and cycle stability of MnO-based materials as a lithium-ion battery anode associated with the pulverization and gradual aggregation during conversion process, we construct robust mesoporous N-doped carbon (N-C) protected MnO nanoparticles on reduced graphene oxide (rGO) (MnO@N-C/rGO) by a simple top-down incorporation strategy. Such dual carbon protection endows MnO@N-C/rGO with excellent structural stability and enhanced charge transfer kinetics. At 100 mA g-1, it exhibits superior rate capability as high as 864...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332818/in-situ-preparation-of-metal-halide-perovskite-nanocrystal-thin-films-for-improved-light-emitting-devices
#3
Lianfeng Zhao, Yao-Wen Yeh, Nhu L Tran, Fan Wu, Zhengguo Xiao, Ross A Kerner, YunHui L Lin, Gregory D Scholes, Nan Yao, Barry P Rand
Hybrid organic-inorganic halide perovskite semiconductors are attractive candidates for optoelectronic applications, such as photovoltaics, light-emitting diodes, and lasers. Perovskite nanocrystals are of particular interest, where electrons and holes can be confined spatially, promoting radiative recombination. However, nanocrystalline films based on traditional colloidal nanocrystal synthesis strategies suffer from the use of long insulating ligands, low colloidal nanocrystal concentration, and significant aggregation during film formation...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28326237/advances-in-the-fabrication-of-graphene-transistors-on-flexible-substrates
#4
Gabriele Fisichella, Stella Lo Verso, Silvestra Di Marco, Vincenzo Vinciguerra, Emanuela Schilirò, Salvatore Di Franco, Raffaella Lo Nigro, Fabrizio Roccaforte, Amaia Zurutuza, Alba Centeno, Sebastiano Ravesi, Filippo Giannazzo
Graphene is an ideal candidate for next generation applications as a transparent electrode for electronics on plastic due to its flexibility and the conservation of electrical properties upon deformation. More importantly, its field-effect tunable carrier density, high mobility and saturation velocity make it an appealing choice as a channel material for field-effect transistors (FETs) for several potential applications. As an example, properly designed and scaled graphene FETs (Gr-FETs) can be used for flexible high frequency (RF) electronics or for high sensitivity chemical sensors...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28319666/full-color-generation-using-silver-tandem-nanodisks
#5
Hao Wang, Xiaolong Wang, Chen Yan, Hua Zhao, Jingwen Zhang, Christian Santschi, Olivier J F Martin
Plasmonic effects associated with metallic nanostructures have been widely studied for color generation. It became apparent that highly saturated and bright colors are hard to obtain and very small nanostructures need to be fabricated. To address this issue, in this study we employ metal-insulator-metal sandwich nanodisks that support enhanced in-phase electric dipole modes, which are blue shifted with respect to a single metal disk. The blue shift enables the generation of short wavelength colors with larger nanostructures...
March 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28306719/chromosome-19q13-disruption-alters-expressions-of-cyp2a7-mia-and-mia-rab4b-lncrna-and-contributes-to-fap-like-phenotype-in-apc-mutation-negative-familial-colorectal-cancer-patients
#6
Lai Fun Thean, Yu Hui Wong, Michelle Lo, Carol Loi, Min Hoe Chew, Choong Leong Tang, Peh Yean Cheah
Familial adenomatous polyposis (FAP) is an autosomal-dominantly inherited form of colorectal cancer (CRC) caused by mutation in the adenomatous polyposis coli (APC) gene. Our ability to exhaustively screen for APC mutations identify microsatellite-stable and APC-mutation negative familial CRC patients, enabling us to search for novel genes. We performed genome-wide scan on two affected siblings of one family and 88 ethnicity- and gender-matched healthy controls to identify deletions shared by the siblings. Combined loss of heterozygosity, copy number and allelic-specific copy number analysis uncovered 5 shared deletions...
2017: PloS One
https://www.readbyqxmd.com/read/28306256/enhanced-superconductivity-in-restacked-tas2-nanosheets
#7
Jie Pan, Chenguang Guo, Changsheng Song, Xiaofang Lai, Hui Li, Wei Zhao, Hui Zhang, Gang Mu, Kejun Bu, Tianquan Lin, Xiaoming Xie, Mingwei Chen, Fuqiang Huang
Since interface superconductivity was discovered at the interface between two insulating layers LaAlO3 and SrTiO3, such interface-induced superconducting systems have been a research hotspot in superconductivity. Here, we report homogeneous interfaces formed by stacking chemically exfoliated monolayer TaS2 nanosheets randomly. Enhanced superconductivity of Tc = 3 K is observed, compared with 0.8 K of parent 2H-TaS2. The measurement of heat capacity shows the increase of electronic specific-heat coefficient γ of restacked TaS2 nanosheets compared to parent 2H-TaS2 crystals...
March 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28303269/iron-vacancy-in-tetragonal-fe1-xs-crystals-and-its-effect-on-the-structure-and-superconductivity
#8
Zhongnan Guo, Fun Sun, Bingling Han, Kun Lin, Liang Zhou, Wenxia Yuan
Understanding the effects of non-stoichiometry on the structure and physical properties of tetragonal Fe chalcogenides is of great importance, especially for developing fascinating superconductivity in this system, which might be very sensitive to the non-stoichiometry. In this study, a series of Fe1-xS single crystals were synthesized by a hydrothermal method, which show varying concentrations of Fe vacancies (0 ≤ x ≤ 0.1) in the structure. Based on the crystal samples, the effects of vacancies on the crystal structure and physical properties were studied...
March 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28300752/high-q-wafer-level-package-based-on-modified-tri-layer-anodic-bonding-and-high-performance-getter-and-its-evaluation-for-micro-resonant-pressure-sensor
#9
Liying Wang, Xiaohui Du, Lingyun Wang, Zhanhao Xu, Chenying Zhang, Dandan Gu
In order to achieve and maintain a high quality factor (high-Q) for the micro resonant pressure sensor, this paper presents a new wafer level package by adopting cross-layer anodic bonding technique of the glass/silicon/silica (GSS) stackable structure and integrated Ti getter. A double-layer structure similar to a silicon-on-insulator (SOI) wafer is formed after the resonant layer and the pressure-sensitive layer are bonded by silicon direct bonding (SDB). In order to form good bonding quality between the pressure-sensitive layer and the glass cap layer, the cross-layer anodic bonding technique is proposed for vacuum package by sputtering Aluminum (Al) on the combination wafer of the pressure-sensitive layer and the resonant layer to achieve electrical interconnection...
March 16, 2017: Sensors
https://www.readbyqxmd.com/read/28287749/boron-doping-of-multi-walled-carbon-nanotubes-significantly-enhances-hole-extraction-in-carbon-based-perovskite-solar-cells
#10
Xiaoli Zheng, Haining Chen, Qiang Li, Yinglong Yang, Zhanhua Wei, Yang Bai, Yongcai Qiu, Dan Zhou, Kam Sing Wong, Shihe Yang
Compared with the conventional perovskite solar cells (PSCs) containing hole-transport materials (HTM), carbon materials based HTM-free PSCs (C-PSCs) have often suffered from inferior power conversion efficiencies (PCEs) arising at least partially from the inefficient hole extraction at perovskite/carbon interface. Here, we show that boron (B) doping of multi-walled carbon nanotubes (B-MWNTs) electrodes are superior in enabling enhanced hole extraction and transport by increasing work function, carrier concentration and conductivity of MWNTs...
March 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28287748/colossal-terahertz-magnetoresistance-at-room-temperature-in-epitaxial-la0-7sr0-3mno3-nanocomposites-and-single-phase-thin-films
#11
J Lloyd-Hughes, Connor Mosley, Samuel Jones, Martin R Lees, Aiping Chen, Quanxi Jia, Eun Mi Choi, Judith L MacManus Driscoll
Colossal magnetoresistance (CMR) is demonstrated at terahertz (THz) frequencies by using terahertz time-domain magnetospectroscopy to examine nanocolumns and planar thin films of La0.7Sr0.3MnO3. At the metal-insulator transition the THz conductivity of the nanocolumn film was dramatically enhanced by the application of a magnetic field, creating a non-Drude conductivity that increased with frequency. The colossal magnetoresistance at 1.0THz is -99.9% at the Curie temperature (room temperature), far exceeding the dc magnetoresistance...
March 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28272872/low-energy-co2-release-from-metal-organic-frameworks-triggered-by-external-stimuli
#12
Haiqing Li, Matthew R Hill
Groundbreaking research over the past 15 years has established metal-organic frameworks (MOFs) as adsorbents capable of unprecedented gas adsorption capacity. This has encouraged the contemplation of their use in applications such as increasing the storage capacity in natural gas fuel tanks, or the capture of carbon dioxide from coal-fired flue gas streams. However, while the gas adsorption capacity of MOFs is large, not all stored gas can be readily released to realize the efficient regeneration of MOF adsorbents...
March 8, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28263026/epitaxial-growth-of-ternary-topological-insulator-bi2-te2-se-2d-crystals-on-mica
#13
Yujing Liu, Min Tang, Mengmeng Meng, Mingzhan Wang, Jinxiong Wu, Jianbo Yin, Yubing Zhou, Yunfan Guo, Congwei Tan, Wenhui Dang, Shaoyun Huang, H Q Xu, Yong Wang, Hailin Peng
Nanostructures of ternary topological insulator (TI) Bi2 Te2 Se are, in principle, advantageous to the manifestation of topologically nontrivial surface states, due to significantly enhanced surface-to-volume ratio compared with its bulk crystals counterparts. Herein, the synthesis of 2D Bi2 Te2 Se crystals on mica via the van der Waals epitaxy method is explored and systematically the growth behaviors during the synthesis process are investigated. Accordingly, 2D Bi2 Te2 Se crystals with domain size up to 50 µm large and thickness down to 2 nm are obtained...
March 6, 2017: Small
https://www.readbyqxmd.com/read/28262505/distinct-roles-of-brd2-and-brd4-in-potentiating-the-transcriptional-program-for-th17-cell-differentiation
#14
Ka Lung Cheung, Fan Zhang, Anbalagan Jaganathan, Rajal Sharma, Qiang Zhang, Tsuyoshi Konuma, Tong Shen, June-Yong Lee, Chunyan Ren, Chih-Hung Chen, Geming Lu, Matthew R Olson, Weijia Zhang, Mark H Kaplan, Dan R Littman, Martin J Walsh, Huabao Xiong, Lei Zeng, Ming-Ming Zhou
The BET proteins are major transcriptional regulators and have emerged as new drug targets, but their functional distinction has remained elusive. In this study, we report that the BET family members Brd2 and Brd4 exert distinct genomic functions at genes whose transcription they co-regulate during mouse T helper 17 (Th17) cell differentiation. Brd2 is associated with the chromatin insulator CTCF and the cohesin complex to support cis-regulatory enhancer assembly for gene transcriptional activation. In this context, Brd2 binds the transcription factor Stat3 in an acetylation-sensitive manner and facilitates Stat3 recruitment to active enhancers occupied with transcription factors Irf4 and Batf...
March 16, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28256125/enhanced-nmr-with-optical-pumping-yields-75-as-signals-selectively-from-a-buried-gaas-interface
#15
Matthew M Willmering, Zayd L Ma, Melanie A Jenkins, John F Conley, Sophia E Hayes
We have measured the (75)As signals arising from the interface region of single-crystal semi-insulating GaAs that has been coated and passivated with an aluminum oxide film deposited by atomic layer deposition (ALD) with optically pumped NMR (OPNMR). Using wavelength-selective optical pumping, the laser restricts the volume from which OPNMR signals are collected. Here, OPNMR signals were obtained from the interface region and distinguished from signals arising from the bulk. The interface region is highlighted by interactions that disrupt the cubic symmetry of the GaAs lattice, resulting in quadrupolar satellites for nuclear [Formula: see text] isotopes, whereas NMR of the "bulk" lattice is nominally unsplit...
March 10, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28254285/pre-dispersed-organo-montmorillonite-organo-mmt-nanofiller-morphology-cytocompatibility-and-impact-on-flexibility-toughness-and-biostability-of-biomedical-ethyl-vinyl-acetate-eva-copolymer
#16
Azlin F Osman, Tuty Fareyhynn M Fitri, Md Rakibuddin, Fatimah Hashim, Syed Ahmad Tajudin Tuan Johari, Rajakumar Ananthakrishnan, Rafiza Ramli
Polymer-clay based nanocomposites are among the attractive materials to be applied for various applications, including biomedical. The incorporation of the nano sized clay (nanoclay) into polymer matrices can result in their remarkable improvement in mechanical, thermal and barrier properties as long as the nanofillers are well exfoliated and dispersed throughout the matrix. In this work, exfoliation strategy through pre-dispersing process of the organically modified montmorillonite (organo-MMT) nanofiller was done to obtain ethyl vinyl acetate (EVA) nanocomposite with improved flexibility, toughness, thermal stability and biostability...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28252106/enhanced-pec-performance-of-nanoporous-si-photoelectrodes-by-covering-hfo2-and-tio2-passivation-layers
#17
Zhuo Xing, Feng Ren, Hengyi Wu, Liang Wu, Xuening Wang, Jingli Wang, Da Wan, Guozhen Zhang, Changzhong Jiang
Nanostructured Si as the high efficiency photoelectrode material is hard to keep stable in aqueous for water splitting. Capping a passivation layer on the surface of Si is an effective way of protecting from oxidation. However, it is still not clear in the different mechanisms and effects between insulating oxide materials and oxide semiconductor materials as passivation layers. Here, we compare the passivation effects, the photoelectrochemical (PEC) properties, and the corresponding mechanisms between the HfO2/nanoporous-Si and the TiO2/nanoporous-Si by I-V curves, Motte-schottky (MS) curves, and electrochemical impedance spectroscopy (EIS)...
March 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28248389/plasmonic-nanogratings-on-mim-and-soi-thin-film-solar-cells-comparison-and-optimization-of-optical-and-electric-enhancements
#18
Mehdi Heydari, Mohammad Sabaeian
In this work, Ag nanogratings comprised of arrays of nanostrips with three different cross sections of triangular, rectangular, and trapezoidal shape were considered and put at the top of the thin-film metal-insulator-metal (MIM) and semiconductor-on-insulator (SOI) solar cells. Then, the optical absorption and the short-circuit current density (J<sub>SC</sub>) enhancement (relative to a bare cell) were calculated and compared. In addition, the best strip cross section among three types of cross sections and the optimum grating period were found...
March 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28239737/splitting-methanol-on-ultra-thin-mgo-100-films-deposited-on-a-mo-substrate
#19
Zhenjun Song, Hu Xu
The dissociation reaction of methanol on metal-supported MgO(100) films has been studied by employing density functional theory calculations. As far as we know, the dissociation of a single methanol molecule over inert oxide insulators such as MgO has not yet been successfully realized without the introduction of defects or low coordinated atoms. By depositing ultra-thin oxide films on a Mo substrate, we have successfully proposed the dissociative state of methanol. The dissociation reaction is energetically exothermic and nearly barrierless...
February 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28228005/strained-germanium-quantum-well-pmosfets-on-soi-with-mobility-enhancement-by-external-uniaxial-stress
#20
Yan Liu, Jiebin Niu, Hongjuan Wang, Genquan Han, Chunfu Zhang, Qian Feng, Jincheng Zhang, Yue Hao
Well-behaved Ge quantum well (QW) p-channel metal-oxide-semiconductor field-effect transistors (pMOSFETs) were fabricated on silicon-on-insulator (SOI) substrate. By optimizing the growth conditions, ultrathin fully strained Ge film was directly epitaxially grown on SOI at about 450 °C using ultra-high vacuum chemical vapor deposition. In situ Si2H6 passivation of Ge was utilized to form a high-quality SiO2/Si interfacial layer between the high-κ dielectric and channels. Strained Ge QW pMOSFETs achieve the significantly improved effective hole mobility μ eff as compared with the relaxed Si and Ge control devices...
December 2017: Nanoscale Research Letters
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