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Yuan Tian, Zhenghao Sun, Yongguang Zhang, Xin Wang, Zhumabay Bakenov, Fuxing Yin
An efficient, industry-accepted spray drying method was used to synthesize micro-spherical sulfur/graphene oxide (S/GO) composites as cathode materials within lithium sulfur batteries. The as-designed wrapping of the sulfur-nanoparticles, with wrinkled GO composites, was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The unique morphological design of this material enabled superior discharge capacity and cycling performance, demonstrating a high initial discharge capacity of 1400 mAh g-1 at 0...
January 18, 2018: Nanomaterials
Kiyou Shibata, Toshiaki Tanigaki, Tetsuya Akashi, Hiroyuki Shinada, Ken Harada, Kodai Niitsu, Daisuke Shindo, Naoya Kanazawa, Yoshinori Tokura, Taka-Hisa Arima
To utilize magnetic skyrmions, nano-scale vortex-like magnetic structure, experimental elucidation of their dynamics against current application in various circumstances such as in confined structure and mixture of different magnetic phases is indispensable. Here, we investigate the current-induced dynamics of the coexistence state of magnetic skyrmions and helical magnetic structure in a thin plate of B20-type helimagnet FeGe in terms of in-situ realspace observation using Lorentz transmission electron microscopy (TEM)...
January 18, 2018: Nano Letters
Vanessa Cavalli, Maicon Sebold, Mirela Sanae Shinohara, Patrícia Nóbrega Rodrigues Pereira, Marcelo Giannini
This study evaluated dentin bond strength (BS) and nanoleakage of non- and pre-etched dentin immediately (T0 ,), 7 days (T7 ), and 14 days (T14 ) after bleaching. Bovine incisors (150) were selected and half of them submitted to intrapulpal dentin etching (e). Non- and pre-etched dentin were subjected to the following (n = 15): no bleaching/control (C); 35% carbamide peroxide (CP); 35% hydrogen peroxide (35% HP); 25% hydrogen peroxide (25% HP); and sodium perborate (SP). Bleaching agents were applied to the pulp chamber four times within a 72-h interval...
January 18, 2018: Microscopy Research and Technique
Minghua Li, Wenbo Bu, Jie Ren, Jianbo Li, Li Deng, Mingyuan Gao, Xiaolong Gao, Peijun Wang
A combination of magnetic hyperthermia and magnetothermally-facilitated drug release system was developed as a promising strategy for liver cancer therapy. The thermosensitive copolymer, 6sPCL-b-P(MEO2MA-co-OEGMA) shows a good temperature-controlled drug release response. Mn-Zn ferrite magnetic nanoparticles (MZF-MNPs) exhibit a strong magnetic thermal effect with an alternating magnetic field (AMF). Owing to its high magnetic sensitivity, the magnetothermally-responsive nanocarrier/doxorubicin (MTRN/DOX) can be concentrated in the tumor site efficiently through magnetic targeting...
2018: Theranostics
In-Tae Bae, Tomohiro Ichinose, Myung-Geun Han, Yimei Zhu, Shintaro Yasui, Hiroshi Naganuma
Comprehensive crystal structural study is performed for BiFeO3 (BFO) film grown on KTaO3 (KTO) substrate using transmission electron microscopy (TEM) and x-ray diffraction (XRD). Nano-beam electron diffraction (NBED) combined with structure factor calculation and high resolution TEM images clearly reveal that the crystal structure within BFO thin film is rhombohedral BFO, i.e., bulk BFO phase. Epitaxial relationship found by NBED indicates the BFO film grows in a manner that minimizes lattice mismatch with KTO...
January 17, 2018: Scientific Reports
Alberto Casu, Andrea Lamberti, Stefano Stassi, Andrea Falqui
The thermally-induced crystallization of anodically grown TiO₂ amorphous nanotubes has been studied so far under ambient pressure conditions by techniques such as differential scanning calorimetry and in situ X-ray diffraction, then looking at the overall response of several thousands of nanotubes in a carpet arrangement. Here we report a study of this phenomenon based on an in situ transmission electron microscopy approach that uses a twofold strategy. First, a group of some tens of TiO₂ amorphous nanotubes was heated looking at their electron diffraction pattern change versus temperature, in order to determine both the initial temperature of crystallization and the corresponding crystalline phases...
January 14, 2018: Nanomaterials
Xuemei Wang, Pengfei Huang, Xiaomin Ma, Xinzhen Du, Xiaoquan Lu
Novel magnetic mesoporous molecularly imprinted polymers (MMIPs) were prepared based on surface precipitation polymerization using Triclosan (TCS) as template and methacrylic acid as functional monomer. The synthesized MMIPs-TCS were applied to the adsorbent of magnetic solid-phase extraction (MSPE) coupled with HPLC for the enrichment and determination of TCS. The MMIPs-TCS were characterized by fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption transmission, and vibrating sample magnetometry...
January 10, 2018: Journal of Chromatography. A
Christian Ahoba-Sam, Kamelia V K Boodhoo, Unni Olsbye, Klaus-Joachim Jens
Cu nanoparticles are known to be very active for methanol (MeOH) synthesis at relatively low temperatures, such that smaller particle sizes yield better MeOH productivity. We aimed to control Cu nanoparticle (NP) size and size distribution for catalysing MeOH synthesis, by using the spinning disk reactor. The spinning disk reactor (SDR), which operates based on shear effect and plug flow in thin films, can be used to rapidly micro-mix reactants in order to control nucleation and particle growth for uniform particle size distribution...
January 17, 2018: Materials
Licong Peng, Ying Zhang, Min He, Bei Ding, Wenhong Wang, Jianqi Li, Jianwang Cai, Shouguo Wang, Guangheng Wu, Baogen Shen
Magnetic skyrmions are topologically protected spin configurations and have recently received growingly attention in magnetic materials. The existence of biskyrmions within a broad temperature range has been identified in our newly-discovered MnNiGa material, promising for potential application in physics and technological study. Here, the biskyrmion microscopic origination from the spin configuration evolution of stripe ground state is experimentally identified. The biskyrmion manipulations based on the influences of the basic microstructures and external factors such as grain boundary confinement, sample thickness, electric current, magnetic field and temperature have been systematically studied by using real-space Lorentz transmission electron microscopy...
January 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Haiou Qu, Jiang Wang, Yong Wu, Jiwen Zheng, Yellela S R Krishnaiah, Mohammad Absar, Stephanie Choi, Muhammad Ashraf, Celia N Cruz, Xiaoming Xu
Commonly used characterization techniques such as cryogenic-transmission electron microscopy (cryo-TEM) and batch-mode dynamic light scattering (DLS) are either time consuming or unable to offer high resolution to discern the poly-dispersity of complex drug products like cyclosporine ophthalmic emulsions. Here, a size-based separation and characterization method for globule size distribution using an asymmetric flow field flow fractionation (AF4) is reported for comparative assessment of cyclosporine ophthalmic emulsion drug products (model formulation) with a wide size span and poly-dispersity...
January 13, 2018: International Journal of Pharmaceutics
ZhiXiong Yang, RenGui Li, ZhengHua Deng
Charging the cells above a conventional voltage of 4.2 V is a promising attempt to increase the energy density of Lithium Cobalt Oxide (LCO), however, the problem of crystal instability at high voltage that leading deterioration of cycle performance needs to be urgently resolved. In this work, as an effective and easy approach to improve the cycle performance and crystal stability of LCO cycling at 4.5 V high voltage, we demonstrate direct surface modification of a LCO cathode by poly [N,N-bis(2-cryano-ethyl)-acrylamide]...
January 16, 2018: Scientific Reports
Maheshkumar Prakash Patil, Yong Bae Seo, Gun-Do Kim
Facile, eco-friendly synthesis of metal nanoparticles has been proposed as a cost effective method. In the present study, we propose the facile synthesis of silver-silver chloride (Ag-AgCl) nanoparticles (NPs) using the medicinally important Agrimonia pilosa plant extract without addition of capping or stabilizing agents. The Ag-AgCl NPs synthesis was observed at 40 °C after 10 min incubation; the synthesis of Ag-AgCl NPs was indicated by color change and confirmed by UV-vis spectroscopic peak at 454 nm...
January 12, 2018: Microbial Pathogenesis
Matthew M Dahm, Mary K Schubauer-Berigan, Douglas E Evans, M Eileen Birch, Stephen Bertke, John D Beard, Aaron Erdely, Joseph E Fernback, Robert R Mercer, Sergey A Grinshpun
BACKGROUND: Recent animal studies have suggested the potential for wide-ranging health effects resulting from exposure to carbon nanotubes and nanofibers (CNT/F). To date, no studies in the US have directly examined the relationship between occupational exposure and potential human health effects. OBJECTIVES: Our goal was to measure CNT/F exposures among US workers with representative job types, from non-exposed to highly exposed, for an epidemiologic study relating exposure to early biologic effects...
January 11, 2018: International Journal of Hygiene and Environmental Health
Naseeruddin Ramapuram, Sumathi V, Nvkv Prasad Tollamadugu, P Sudhakar, Chandrika V, Balam Ravindra Reddy
Evidence based synergistic effects of nanoscale materials (size <100 nm in at least one dimension) were scantly documented in agriculture at field scale. Herein, we report for the first time on effects of nanoscale zinc oxide (n-ZnO), calcium oxide (n-CaO) and magnesium oxide (n-MgO) on growth and productivity of sweet sorghum (Sorghum bicolor (L.) Moench). Modified sol-gel method was used to prepare nanoscale materials under study. Characterization was done using Electron microscopy (TEM & SEM), X-ray diffraction (XRD) and dynamic light scattering (DLS)...
January 16, 2018: Journal of Agricultural and Food Chemistry
Kevin L Gu, Yan Zhou, William A Morrison, Katherine Park, Sung Park, Zhenan Bao
Rapid nanoscale imaging of the bulk heterojunction layer in organic solar cells is essential to the continued development of high-performance devices. Unfortunately, commonly used imaging techniques such as tunneling electron microscopy (TEM) and atomic force microscopy (AFM) suffer from significant drawbacks. For instance, assuming domain identity from phase contrast or topographical features can lead to inaccurate morphological conclusions. Here we demonstrate a technique known as Photo-induced Force Microscopy (PiFM) for imaging organic solar cell bulk heterojunctions with nanoscale chemical specificity...
January 16, 2018: ACS Nano
Zhixue Bai, Wenhao Dong, Yipeng Ren, Cong Zhang, Qiang Chen
The flourish of nanotechnology has brought new vitality to the research and development of electrochemical sensing materials. In this work, we successfully synthesized Nano Au & Pt alloy microspheres decorated with reduced graphene oxide (RGO/nAPAMSs) by a simple, facile and eco-friendly one-step reduction strategy for the fabrication of highly sensitive non-enzymatic H2O2 sensing interfaces. Energy-dispersive X-ray spectroscopy mapping (EDX mapping), energy-dispersive X-ray spectroscopy analyzer (EDX), transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR) and X-ray diffraction spectrum (XRD) were employed to characterize RGO/nAPAMSs from a microscopic perspective...
January 16, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Seyed Fakhreddin Hosseini, Mohammad Reza Soleimani, Maryam Nikkhah
Fish-purified antioxidant peptide (AOP)-loaded chitosan nanoparticles (CSNPs) were synthesized based on the ionotropic gelation between CS and sodium tripolyphosphate (TPP). The ζ-potential showed an earlier rise and later decrease with increasing concentrations of AOP. Transmission electron microscopy (TEM) images also revealed roughly uniform spherical-shaped nanoparticles with diameter of <100 nm. Molecular interactions among the components of the NPs and peptides were confirmed by FT-IR spectroscopy...
January 11, 2018: International Journal of Biological Macromolecules
Mohammad Shakir, Iram Zia, Abdur Rehman, Rizwan Ullah
In this communication we describe the fabrication of nano-hydroxyapatite/chitosan-tamarind seed polysaccharide (n-HA/CS-TSP) nanocomposite with a weight ratio of 70/20/10, 70/15/15 and 70/10/20, respectively through a co-precipitation method. A comparative assessment of the properties of n-HA/CS-TSP and n-HA/CS nanocomposites was done by FT-IR, SEM-EDX, TEM, TGA/DTA, XRD and mechanical testing. The results suggested strong chemical interactions between the three components, decreased particle size and homogeneous dispersion of n-HA particles in n-HA/CS-TSP as compared to n-HA/CS...
January 11, 2018: International Journal of Biological Macromolecules
Yuan Zhao, Huan Wang, Shengpeng Xia, Feng Zhou, Zhenghui Luo, Jiajia Luo, Feng He, Chuluo Yang
Two different non-fullerene small molecule acceptors, named m-PIB and p-PIB based on 9,9'-bifluorenylidene (BF) and perylene diimide (PDI) were designed and synthesized. Four β-substituted PDIs were linked to 9,9'-bifluorenylidene in different positions. Based on the analysis of density function theory (DFT), p-PIB exhibited reduced intramolecular twisting between the perylene diimide moieties, more delocalized wave function and sufficiently wider π-electron delocalization compared to m-PIB. The absorption ability of p-PIB was enhanced due to the increased intermolecular interaction...
January 16, 2018: Chemistry: a European Journal
Yan Jiao, Xiqun Zheng, Ying Chang, Dajing Li, Xiaohong Sun, Xiaolan Liu
Zein and its derived peptides have been used as nanocarriers for bioactive components. Lutein, as well as other xanthophylls, are characterized by blue light filtering and anti-oxidant properties. However, lutein is unstable and has low water solubility, poor absorption, and low bioavailability. In order to protect lutein from oxidative degradation, and to enhance its solubility and dispersibility, stability and bioactivity, lutein-loaded zein nanoparticles (LLZ-NP) and zein-derived peptide nanoparticles (LLZ-PEP-NP) were prepared by the solvent diffusion method...
January 16, 2018: Food & Function
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