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https://www.readbyqxmd.com/read/28335500/comparison-of-two-types-of-overoxidized-pedot-films-and-their-application-in-sensor-fabrication
#1
Yun Hui, Chao Bian, Jinfen Wang, Jianhua Tong, Shanhong Xia
Poly(3,4-ethylenedioxythiophene) (PEDOT) films were prepared by electro-oxidation on Au microelectrodes in an aqueous solution. Electrolyte solutions and polymerization parameters were optimized prior to overoxidation. The effect of overoxidation time has been optimized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), which results in the film overoxidized for 45 s at 1.35 V presenting a strong adsorption. The other one-step overoxidation film prepared by direct CV ranging from -0...
March 19, 2017: Sensors
https://www.readbyqxmd.com/read/28335396/optimization-of-conditions-for-cyanidin-3-oglucoside-c3g-nanoliposome-production-by-response-surface-methodology-and-cellular-uptake-studies-in-caco-2-cells
#2
Tisong Liang, Rongfa Guan, Haitao Shen, Qile Xia, Mingqi Liu
We aimed to optimize the formulation of C3G nanoliposomes using response surface methodology. Additionally, we evaluated the stability, particle change, and encapsulation efficiency (EE) of C3G nanoliposomes under different temperatures and storage durations, as well as in simulated gastrointestinal juice (SGF) and simulated intestinal fluid. The morphology of C3G nanoliposomes was observed by transmission electron microscope. The ability of C3G nanoliposomes to affect cancer cell morphology and inhibit cancer cell proliferation was studied with Caco-2 cells...
March 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28335360/super-hydrophobic-icephobic-coatings-based-on-silica-nanoparticles-modified-by-self-assembled-monolayers
#3
Junpeng Liu, Zaid A Janjua, Martin Roe, Fang Xu, Barbara Turnbull, Kwing-So Choi, Xianghui Hou
A super-hydrophobic surface has been obtained from nanocomposite materials based on silica nanoparticles and self-assembled monolayers of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (POTS) using spin coating and chemical vapor deposition methods. Scanning electron microscope images reveal the porous structure of the silica nanoparticles, which can trap small-scale air pockets. An average water contact angle of 163° and bouncing off of incoming water droplets suggest that a super-hydrophobic surface has been obtained based on the silica nanoparticles and POTS coating...
December 2, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335344/a-targeted-nanoprobe-based-on-carbon-nanotubes-natural-biopolymer-chitosan-composites
#4
Baoyan Wu, Na Zhao
A novel targeting theranostic nanoprobe based on single-walled carbon nanotubes (SWCNTs)-natural biopolymer chitosan composites was developed for cancer cell targeting imaging and fluorescence imaging-guided photodynamic therapy. First, chitosan was respectively conjugated with a tumor-homing molecule folic acid, or a photosensitizing drug pyropheophorbide a using a water-soluble carbodiimide coupling chemistry. Chitosan was fluorescently labeled by fluorescein isothiocyanate via the covalently linkage of the isothiocyanate group with the amino group...
November 17, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335328/investigation-of-the-mechanical-properties-and-microstructure-of-graphene-nanoplatelet-cement-composite
#5
Baomin Wang, Ruishuang Jiang, Zhenlin Wu
In this work, graphene nanoplatelets (GNPs) were dispersed uniformly in aqueous solution using methylcellulose (MC) as a dispersing agent via ultrasonic processing. Homogenous GNP suspensions were incorporated into the cement matrix to investigate the effect of GNPs on the mechanical behavior of cement paste. The optimum concentration ratio of GNPs to MC was confirmed as 1:7 by ultraviolet visible spectroscopy (UV-Vis), and the optical microscope and transmission electron microscopy (TEM) images displayed remarkable dispersing performance...
November 4, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335288/biosynthesis-of-silver-nanoparticles-using-taxus-yunnanensis-callus-and-their-antibacterial-activity-and-cytotoxicity-in-human-cancer-cells
#6
Qian Hua Xia, Yan Jun Ma, Jian Wen Wang
Plant constituents could act as chelating/reducing or capping agents for synthesis of silver nanoparticles (AgNPs). The green synthesis of AgNPs has been considered as an environmental friendly and cost-effective alternative to other fabrication methods. The present work described the biosynthesis of AgNPs using callus extracts from Taxus yunnanensis and evaluated their antibacterial activities in vitro and potential cytotoxicity in cancer cells. Callus extracts were able to reduce silver nitrate at 1 mM in 10 min...
September 1, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335268/optoelectronic-and-electrochemical-properties-of-vanadium-pentoxide-nanowires-synthesized-by-vapor-solid-process
#7
Ko-Ying Pan, Da-Hua Wei
Substantial synthetic vanadium pentoxide (V₂O₅) nanowires were successfully produced by a vapor-solid (VS) method of thermal evaporation without using precursors as nucleation sites for single crystalline V₂O₅ nanowires with a (110) growth plane. The micromorphology and microstructure of V₂O₅ nanowires were analyzed by scanning electron microscope (SEM), energy-dispersive X-ray spectroscope (EDS), transmission electron microscope (TEM) and X-ray diffraction (XRD). The spiral growth mechanism of V₂O₅ nanowires in the VS process is proved by a TEM image...
July 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335247/hydrothermal-fabrication-of-silver-nanowires-silver-nanoparticles-graphene-nanosheets-composites-in-enhancing-electrical-conductive-performance-of-electrically-conductive-adhesives
#8
Hongru Ma, Jinfeng Zeng, Steven Harrington, Lei Ma, Mingze Ma, Xuhong Guo, Yanqing Ma
Silver nanowires-silver nanoparticles-graphene nanosheets (AgNWs-AgNPs-GN) hybrid nanomaterials were fabricated through a hydrothermal method by using glucose as a green reducing agent. The charge carriers of AgNWs-AgNPs-GN passed through defect regions in the GNs rapidly with the aid of the AgNW and AgNP building blocks, leading to high electrical conductivity of electrically conductive adhesives (ECA) filled with AgNWs-AgNPs-GN. The morphologies of synthesized AgNWs-AgNPs-GN hybrid nanomaterials were characterized by field emission scanning electron microscope (FESEM), and high resolution transmission electron microscopy (HRTEM)...
June 21, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335246/quaternized-carboxymethyl-chitosan-based-silver-nanoparticles-hybrid-microwave-assisted-synthesis-characterization-and-antibacterial-activity
#9
Siqi Huang, Jing Wang, Yang Zhang, Zhiming Yu, Chusheng Qi
A facile, efficient, and eco-friendly approach for the preparation of uniform silver nanoparticles (Ag NPs) was developed. The synthesis was conducted in an aqueous medium exposed to microwave irradiation for 8 min, using laboratory-prepared, water-soluble quaternized carboxymethyl chitosan (QCMC) as a chemical reducer and stabilizer and silver nitrate as the silver source. The structure of the prepared QCMC was characterized using Fourier transform infrared (FT-IR) and ¹H nuclear magnetic resonance (NMR)...
June 17, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335234/fe-3-doped-tio%C3%A2-nanotube-arrays-on-ti-fe-alloys-for-enhanced-photoelectrocatalytic-activity
#10
Jiangdong Yu, Zhi Wu, Cheng Gong, Wang Xiao, Lan Sun, Changjian Lin
Highly ordered, vertically oriented Fe(3+)-doped TiO₂ nanotube arrays (Fe-TNTs) were prepared on Ti-Fe alloy substrates with different Fe contents by the electrochemical anodization method. The as-prepared Fe-TNTs were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and related electrochemical techniques. XPS results demonstrated that Fe(3+) ions were successfully doped into TiO₂ nanotubes. The photoelectrochemical activity of Fe-TNTs was compared with that of pure TiO₂ nanotube arrays (TNTs)...
June 6, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335227/synthesis-of-ball-like-ag-nanorod-aggregates-for-surface-enhanced-raman-scattering-and-catalytic-reduction
#11
Wenjing Zhang, Yin Cai, Rui Qian, Bo Zhao, Peizhi Zhu
In this work, ball-like Ag nanorod aggregates have been synthesized via a simple seed-mediated method. These Ag mesostructures were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV-Vis), and X-ray diffraction (XRD). Adding a certain amount of polyvinyl pyrrolidone (PVP) can prolong its coagulation time. These Ag nanorod aggregates exhibit effective SERS effect, evaluated by Rhodamine 6G (R6G) and doxorubicin (DOX) as probe molecules...
May 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335200/structural-and-magnetic-response-in-bimetallic-core-shell-magnetic-nanoparticles
#12
Adeela Nairan, Usman Khan, Munawar Iqbal, Maaz Khan, Khalid Javed, Saira Riaz, Shahzad Naseem, Xiufeng Han
Bimagnetic monodisperse CoFe₂O₄/Fe₃O₄ core/shell nanoparticles have been prepared by solution evaporation route. To demonstrate preferential coating of iron oxide onto the surface of ferrite nanoparticles X-ray diffraction (XRD), High resolution transmission electron microscope (HR-TEM) and Raman spectroscopy have been performed. XRD analysis using Rietveld refinement technique confirms single phase nanoparticles with average seed size of about 18 nm and thickness of shell is 3 nm, which corroborates with transmission electron microscopy (TEM) analysis...
April 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334987/magnetic-solid-phase-extraction-of-n-n-diethyl-m-toluamide-from-baby-toilet-water-prior-to-its-hplc-uv-detection
#13
Xiaowei Ma, Fan Feng, Yang Yang, Xueping Dang, Jianlin Huang, Huaixia Chen
Fe3O4@MIL-100 (MIL, Material Institut Lavoisier) core-shell magnetic microspheres were prepared and applied as the sorbent for the magnetic solid phase extraction (MSPE) of N,N-diethyl-m-toluamide (DEET) in baby toilet water for the first time. The synthesized magnetic metal-organic frameworks were characterized by transmission electron microscope, infrared spectroscopy and thermogravimetric analysis. The functionalized magnetic microparticles showed excellent dispersibility in aqueous solution. The MSPE conditions were investigated in detail...
March 3, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28334778/exploration-of-deep-eutectic-solvent-based-molecularly-imprinted-polymers-as-solid-phase-extraction-sorbents-for-screening-chloramphenicol-in-milk
#14
Weiyang Tang, Fan Gao, Yue Duan, Tao Zhu, Kyung Ho Row
Novel deep eutectic solvents modified molecularly imprinted polymers (DESs-MIPs) were synthesized using acrylamide as function monomer, alcohol-based DESs as auxiliary function monomer and chloramphenicol (CAP) as the template. The DESs modified materials were characterized by Fourier transform infrared and field emission scanning electron microscope. The adsorption results that the choline chloride/ethylene glycol DESs-based MIPs had stable interactions with CAP. So the choline chloride/ethylene glycol DESs-based MIPs were applied as sorbent of minimized pipette-tip solid-phase extraction (PT-SPE) for rapid screening CAP from milk sample...
February 27, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28334660/preparation-and-photovoltaic-properties-of-cds-quantum-dot-sensitized-solar-cell-based-on-zinc-tin-mixed-metal-oxides
#15
Jiupeng Cao, Yifan Zhao, Yatong Zhu, Xiaoyu Yang, Peng Shi, Hongdi Xiao, Na Du, Wanguo Hou, Genggeng Qi, Jianqiang Liu
The present study reports a new type of quantum dot sensitized solar cells (QDSSCs) using the zinc tin mixed metal oxides (MMO) as the anode materials, which were obtained from the layered double hydroxide (LDH) precursor. The successive ionic layer adsorption and reaction (SILAR) method is applied to deposit CdS quantum dots. The effects of sensitizing cycles on the performance of CdS QDSSC are studied. Scanning electron microscopy (SEM), Transmission electron microscope (TEM) and X-ray diffraction (XRD) are used to identify the surface profile and crystal structure of the mixed metal oxides anode...
March 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28334630/probing-the-oxidative-etching-induced-dissolution-of-palladium-nanocrystals-in-solution-by-liquid-cell-transmission-electron-microscopy
#16
Yingying Jiang, Guomin Zhu, Ganxing Dong, Fang Lin, Hui Zhang, Jun Yuan, Ze Zhang, Chuanhong Jin
A microscopic study of dissolution process of nanocrystals, an opposite while functioning cooperatively with growth in many cases, is an essential issue in variety aspects of research on nanocrystals. In this work, an in situ study of the dynamic dissolution process of palladium nanocrystals by liquid cell transmission electron microscope (TEM) is presented. The effective critical size (Rcritical) for monodispersed nanocrystals is determined to be about 5nm in the experimental condition of this article. When the size of nanocrystal is above Rcritical, the dissolution rate (dr/dt) is nearly a constant...
March 7, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28334577/on-the-achievable-field-sensitivity-of-a-segmented-annular-detector-for-differential-phase-contrast-measurements
#17
Felix Schwarzhuber, Peter Melzl, Josef Zweck
Differential phase contrast microscopy measures minute deflections of the electron probe due to electric and/or magnetic fields, using a position sensitive device. Although recently, pixelated detectors have become available which also serve as a position sensitive device, the most frequently used detector is a four-segmented annular semiconducting detector ring (or variations thereof), where the difference signals of opposing detector elements represent the components of the deflection vector. This deflection vector can be used directly to quantitatively determine the deflecting field, provided the specimen's thickness is known...
March 4, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28334576/stemsalabim-a-high-performance-computing-cluster-friendly-code-for-scanning-transmission-electron-microscopy-image-simulations-of-thin-specimens
#18
Jan Oliver Oelerich, Lennart Duschek, Jürgen Belz, Andreas Beyer, Sergei D Baranovskii, Kerstin Volz
We present a new multislice code for the computer simulation of scanning transmission electron microscope (STEM) images based on the frozen lattice approximation. Unlike existing software packages, the code is optimized to perform well on highly parallelized computing clusters, combining distributed and shared memory architectures. This enables efficient calculation of large lateral scanning areas of the specimen within the frozen lattice approximation and fine-grained sweeps of parameter space.
March 10, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28334551/using-micro-patterned-surfaces-to-inhibit-settlement-and-biofilm-formation-by-bacillus-subtilis
#19
Siyuan Chang, Xiaodong Chen, Shuo Jiang, Jinchun Chen, Lin Shi
Biofilm is a biological complex caused by bacteria settlement to the substrates, their subsequent reproduction and secretion. This phenomena reduce heat transfer efficiency and cause significant losses in treated sewage heat recovering systems. This paper describes a physical approach to inhibit the bacteria settlement and biofilm formation by Bacillus subtilis, which is the dominant genera in the treated sewage. Here, the micro-patterned surfaces with different characteristics (stripe and cube) and dimensions (1 μm to 100 μm) were fabricated as surfaces of interest...
March 23, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28334370/differences-in-climbing-ability-of-cimex-lectularius-and-cimex-hemipterus-hemiptera-cimicidae
#20
Dae-Yun Kim, Johan Billen, Stephen L Doggett, Chow-Yang Lee
The climbing abilities of two bed bug species, Cimex lectularius L. and Cimex hemipterus (F.), were determined by evaluating their escape rates from smooth surface pitfall traps using four commercial bed bug monitors (Verifi Bed Bug Detector, ClimbUp Insect Interceptor, BlackOut Bed Bug Detector, and SenSci Volcano Bed Bug Detector). All detectors were used in the absence of lures or attractants. Unlike C. lectularius, adult C. hemipterus were able to escape from all traps. On the other hand, no or a low number nymphs of both species escaped, depending on the evaluated traps...
March 15, 2017: Journal of Economic Entomology
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