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Sample preparation for scanning electron microscopy

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https://www.readbyqxmd.com/read/29791140/correlative-stimulated-emission-depletion-and-scanning-ion-conductance-microscopy
#1
Philipp Hagemann, Astrid Gesper, Patrick Happel
Correlation microscopy combining fluorescence and scanning probe or electron microscopy is limited to fixed samples due to the sample preparation and nonphysiological imaging conditions required by most probe or electron microscopy techniques. Among the few scanning probe techniques that allow imaging of living cells under physiological conditions, scanning ion conductance microscopy (SICM) has been shown to be the technique that minimizes the impact on the investigated sample. However, combinations of SICM and fluorescence microscopy suffered from the mismatch in resolution due to the limited resolution of conventional light microscopy...
May 25, 2018: ACS Nano
https://www.readbyqxmd.com/read/29789457/enhanced-catalytic-reduction-of-4-nitrophenol-driven-by-fe%C3%A2-o%C3%A2-au-magnetic-nanocomposite-interface-engineering-from-facile-preparation-to-recyclable-application
#2
Yue Chen, Yuanyuan Zhang, Qiangwei Kou, Yang Liu, Donglai Han, Dandan Wang, Yantao Sun, Yongjun Zhang, Yaxin Wang, Ziyang Lu, Lei Chen, Jinghai Yang, Scott Guozhong Xing
In this work, we report the enhanced catalytic reduction of 4-nitrophenol driven by Fe₃O₄-Au magnetic nanocomposite interface engineering. A facile solvothermal method is employed for Fe₃O₄ hollow microspheres and Fe₃O₄-Au magnetic nanocomposite synthesis via a seed deposition process. Complementary structural, chemical composition and valence state studies validate that the as-obtained samples are formed in a pure magnetite phase. A series of characterizations including conventional scanning/transmission electron microscopy (SEM/TEM), Mössbauer spectroscopy, magnetic testing and elemental mapping is conducted to unveil the structural and physical characteristics of the developed Fe₃O₄-Au magnetic nanocomposites...
May 22, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29787948/preparation-and-application-of-a-molecular-capture-for-safety-detection-of-cosmetics-based-on-surface-imprinting-and-multi-walled-carbon-nanotubes
#3
Fang Wang, Xiaoyan Li, Junjie Li, Chen Zhu, Min Liu, Zongyuan Wu, Li Liu, Xuecai Tan, Fuhou Lei
A novel composite material for prednisone molecular capture (PS-MC) was prepared by surface imprinting technique in combination with a polyethylene filter plate coated with multi-walled carbon nanotubes for the first time. PS-MC was achieved by using prednisone as the template molecule, 3-aminopropyltriethoxysilane as the monomer, and tetraethoxysilane as the cross-linker. The structure, morphology, and thermal stability of the prepared PS-MC were studied by fourier-transform infrared spectrometry, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and thermogravimetric analysis...
May 14, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29784355/highly-selective-and-sensitive-chemiluminescence-biosensor-for-adenosine-detection-based-on-carbon-quantum-dots-catalyzing-luminescence-released-from-aptamers-functionalized-graphene-magnetic-%C3%AE-cyclodextrin-polymers
#4
Yuanling Sun, Chaofan Ding, Yanna Lin, Weiyan Sun, Hao Liu, Xiaodong Zhu, Yuxue Dai, Chuannan Luo
In this work, a highly selective and sensitive chemiluminescence (CL) biosensor was prepared for adenosine (AD) detection based on carbon quantum dots (CQDs) catalyzing the CL system of luminol-H2 O2 under alkaline environment and CQDs was released from the surface of AD aptamers functionalized graphene @ magnetic β-cyclodextrin polymers (GO@Fe3 O4 @β-CD@A-Apt). Firstly, GO@Fe3 O4 @β-CD and CQDs were prepared and characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), UV-Vis absorption spectra (UV), fluorescence spectra (FL), fourier transform infrared (FTIR) and X-ray powder diffraction (XRD)...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784350/graphene-oxide-based-composite-monolith-as-new-sorbent-for-the-on-line-solid-phase-extraction-and-high-performance-liquid-chromatography-determination-of-%C3%A3-sitosterol-in-food-samples
#5
Beijiao Cui, Bin Guo, Huimin Wang, Doudou Zhang, Haiyan Liu, Ligai Bai, Hongyuan Yan, Dandan Han
A composite monolithic column was prepared by redox initiation method for the on-line purification and enrichment of β-sitosterol, in which graphene oxide (GO) was embedded. The obtained monolithic column was characterized by scanning electron microscopy (SEM) and nitrogen adsorption-desorption isotherm measurement, which indicated that the monolith possessed characteristics of porous structure and high permeability. Under the optimum conditions for extraction and determination, the calibration equation was y = 47...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29782162/water-and-fertilizer-integrated-hydrogel-derived-from-the-polymerization-of-acrylic-acid-and-urea-as-a-slow-release-n-fertilizer-and-water-retention-in-agriculture
#6
Dongdong Cheng, Yan Liu, Guiting Yang, Aiping Zhang
To reduce the preparation cost of superabsorbent and improve the N release rate at the same time, a novel low cost superabsorbent (SA) with the function of N slow release was prepared by chemical synthesis with neutralized acrylic acid (AA), urea, potassium persulfate (KPS) and N,N'-methylenebisacrylamide (MBA). The influence order of influence factors on water absorbency property was determined by orthogonal L18(3)7 experiment. Based on the optimization results of orthogonal experiment, the effects of single factor on the water absorption were studied, and the highest water absorbency (909 g/g) was obtained on the conditions: 1...
May 21, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29781624/helium-ion-microscopy-as-a-high-resolution-probe-for-complex-quantum-heterostructures-in-core-shell-nanowires
#7
Christian Pöpsel, Jonathan Becker, Nari Jeon, Markus Döblinger, Thomas Stettner, Yeanitza Trujillo Gottschalk, Bernhard Loitsch, Sonja Matich, Marcus Altzschner, Alexander W Holleitner, Jonathan Finley, Lincoln J Lauhon, Gregor Koblmueller
Core-shell semiconductor nanowires (NW) with internal quantum heterostructures are among the most complex nanostructured materials to be explored for assessing the ultimate capabilities of diverse ultrahigh-resolution imaging techniques. To probe the structure and composition of these materials in their native environment with minimal damage and sample preparation calls for high-resolution electron or ion microscopy methods, which have not yet been tested on such classes of ultra-small quantum nanostructures...
May 21, 2018: Nano Letters
https://www.readbyqxmd.com/read/29778953/multipath-fabrication-of-hierarchical-cual-layered-double-hydroxide-carbon-fiber-composites-for-the-degradation-of-ammonia-nitrogen
#8
Xiaoming Peng, Min Wang, Fengping Hu, Fengxian Qiu, Tao Zhang, Hongling Dai, Zan Cao
In this work, a series of flower-like CuAl layered double hydroxides (LDHs) and hierarchical CuAl/carbon fiber-LDH (CuAl/CF-LDH) materials were synthesized, and these materials were used as catalysts for the degradation of ammonia nitrogen from simulated wastewater. The morphologies and structures of the materials were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy (RS), X-ray diffraction (XRD), and the Brunauer-Emmett-Teller (BET) technique...
May 17, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29777568/cost-efficient-magnetic-nanoporous-carbon-derived-from-citrus-peel-for-the-selective-adsorption-of-seven-insecticides
#9
Yuantao Zhou, Shurui Cao, Cunxian Xi, Jiuyan Chen, Lei Zhang, Xianliang Li, Guomin Wang, Zhiqiong Chen
A magnetic solid-phase extraction adsorbent that consisted of citrus peel-derived nanoporous carbon and silica-coated Fe3 O4 microspheres (C/SiO2 @Fe3 O4 ) was successfully fabricated by co-precipitation. As a modifier for magnetic microspheres, citrus peel-derived nanoporous carbon was not only economical and renewable for its raw material, but exerted enormous nanosized pore structure, which could directly influence the type of adsorbed analytes. The C/SiO2 @Fe3 O4 also possessed the advantages of Fe3 O4 microspheres like superparamagnetism, that could be easily separated magnetically after adsorption...
May 18, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29773383/superabsorbent-nanocomposite-from-sugarcane-bagasse-chitin-and-clay-synthesis-characterization-and-swelling-behaviour
#10
Maya Sharma, Anjali Bajpai
A nanocomposite comprising crosslinked hybrid polymer network was prepared using chitin and sugarcane bagasse in presence of montmorillonite clay. Chitin and sugarcane bagasse were micro-fibrillated by ultrasonication of their suspension in an ionic liquid 2-hydroxy ethylammonium formate. Optimum reaction conditions were established by variation of amounts of initiator, monomer and crosslinker, and microwave irradiation to obtain nanocomposite with swelling degree above 1000% in 24 h. Slow and steady swelling was observed and the sample swelled to about 15,000% to form a hydrogel in 15 days...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29771925/in-vitro-and-in-vivo-biological-performance-of-porous-ti-alloys-prepared-by-powder-metallurgy
#11
Renata Falchete do Prado, Gabriela Campos Esteves, Evelyn Luzia De Souza Santos, Daiane Acácia Griti Bueno, Carlos Alberto Alves Cairo, Luis Gustavo Oliveira De Vasconcellos, Renata Silveira Sagnori, Fernanda Bastos Pereira Tessarin, Felipe Eduardo Oliveira, Luciane Dias De Oliveira, Maria Fernanda Lima Villaça-Carvalho, Vinicius André Rodrigues Henriques, Yasmin Rodarte Carvalho, Luana Marotta Reis De Vasconcellos
Titanium (Ti) and Ti-6 Aluminium-4 Vanadium alloys are the most common materials in implants composition but β type alloys are promising biomaterials because they present better mechanical properties. Besides the composition of biomaterial, many factors influence the performance of the biomaterial. For example, porous surface may modify the functional cellular response and accelerate osseointegration. This paper presents in vitro and in vivo evaluations of powder metallurgy-processed porous samples composed by different titanium alloys and pure Ti, aiming to show their potential for biomedical applications...
2018: PloS One
https://www.readbyqxmd.com/read/29768839/layered-double-hydroxides-as-precursors-to-ti-4-doped-mgo-nanoparticles-with-tunable-band-gap
#12
Urvashi Sharma, P Jeevanandam
TixMg1-xO solid solutions with tunable band gap are potential candidates for various applications such as photocatalysis, water splitting, dielectrics, etc. Present study reports the synthesis of TixMg1-xO (x = 0.02 to 0.5) solid solution nanoparticles via a simple sol-gel method. First, layered double hydroxides (precursors) are produced by sol-gel method, which on calcination produce the TixMg1-xO solid solutions. The effect of concentration of titanium (introduced as titanium isopropoxide during the synthesis) on the optical properties of TixMg1-xO solid solution nanoparticles has been investigated...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29765652/cell-wall-microstructure-pore-size-distribution-and-absolute-density-of-hemp-shiv
#13
Y Jiang, M Lawrence, M P Ansell, A Hussain
This paper, for the first time, fully characterizes the intrinsic physical parameters of hemp shiv including cell wall microstructure, pore size distribution and absolute density. Scanning electron microscopy revealed microstructural features similar to hardwoods. Confocal microscopy revealed three major layers in the cell wall: middle lamella, primary cell wall and secondary cell wall. Computed tomography improved the visualization of pore shape and pore connectivity in three dimensions. Mercury intrusion porosimetry (MIP) showed that the average accessible porosity was 76...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29765060/iron-specific-signal-separation-from-within-heavy-metal-stained-biological-samples-using-x-ray-microtomography-with-polychromatic-source-and-energy-integrating-detectors
#14
Tsvi Katchalski, Tom Case, Keun-Young Kim, Ranjan Ramachandra, Eric A Bushong, Thomas J Deerinck, Matthias G Haberl, Mason R Mackey, Steven Peltier, Guillaume A Castillon, Nobuko Fujikawa, Albert R Lawrence, Mark H Ellisman
Biological samples are frequently stained with heavy metals in preparation for examining the macro, micro and ultra-structure using X-ray microtomography and electron microscopy. A single X-ray microtomography scan reveals detailed 3D structure based on staining density, yet it lacks both material composition and functional information. Using a commercially available polychromatic X-ray source, energy integrating detectors and a two-scan configuration labelled by their energy- "High" and "Low", we demonstrate how a specific element, here shown with iron, can be detected from a mixture with other heavy metals...
May 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29759648/synthesis-of-magnetic-mesoporous-fe-3-o-4-pei-mof-5-for-the-effective-enrichment-of-malachite-green-and-crystal-violet-in-fish-samples
#15
Zhihui Zhou, Yanqing Fu, Qian Qin, Xin Lu, Xianzhe Shi, Chunxia Zhao, Guowang Xu
A novel, magnetic and mesoporous Fe3 O4 @PEI-MOF-5 material was synthesized for the effective enrichment of malachite green (MG) and crystal violet (CV) in fish samples. The Fe3 O4 @PEI-MOF-5 material was prepared by a facile two-step solvothermal approach in which Fe3 O4 @PEI and MOF-5 were connected through chemical bonds. Characterization of the newly synthesized Fe3 O4 @PEI-MOF-5 material was performed by Fourier transform infrared spectroscopy, X-ray diffractometry, vibrating sample magnetometry, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis and X-ray photoelectron spectroscopy...
May 9, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29759199/determination-and-speciation-of-ultratrace-arsenic-and-chromium-species-using-aluminium-oxide-supported-on-graphene-oxide
#16
Anna Baranik, Anna Gagor, Ignasi Queralt, Eva Marguí, Rafal Sitko, Beata Zawisza
Alumina supported on graphene oxide (Al2 O3 /GO) nanocomposite as new nanosorbent in dispersive micro-solid phase extraction (DMSPE) for As(V) and Cr(III) preconcentration is described. The crucial issue of the study is synthesis of novel nanocomposite suitable for sorption of selected species of arsenic and chromium. Al2 O3 /GO demonstrates selectivity toward arsenates in the presence of arsenites at pH 5 and chromium(III) ions in the presence of chromate anions at pH 6. The Al2 O3 /GO nanocomposite was characterized by scanning electron microscopy (SEM) transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and the Raman spectroscopy...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29757640/supramolecular-properties-of-a-monocarboxylic-acid-functionalized-texas-sized-molecular-box
#17
Ren-Tsung Wu, Xiaodong Chi, Takehiro Hirao, Vincent M Lynch, Jonathan L Sessler
A new carboxylic acid-functionalized "Texas-sized" molecular box TxSB-CO2H has been prepared by combining two separate build-ing blocks via an iodide-catalyzed macrocyclization reaction. A single crystal X-ray diffraction analysis revealed a paired "clip-like" dimer in the solid state. Concentration-dependent behavior is seen for samples of TxSB-CO2H as prepared, as inferred from 1H NMR spectroscopic studies carried out in DMSO-d6. However, in the presence of excess acid (1% by weight of deuterated trifluo-racetic acid; TFA-d1), little evidence of aggregation is seen in DMSO-d6 except at the highest accessible concentrations...
May 14, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29757185/adsorbing-low-concentrations-of-cr-vi-onto-ceo-2-zsm-5-and-the-adsorption-kinetics-isotherms-and-thermodynamics
#18
Jianrui Niu, Xiuxiu Jia, Yaqing Zhao, Yanfang Liu, Weizhang Zhong, Zengli Zhai, Zaixing Li
The CeO2 @ZSM-5 was prepared by the dipping method. We used ZSM-5 and CeO2 as the carrier and load components, respectively. The aim was to reduce the low concentration of Cr(VI) in simulated wastewater (the concentration of Cr(VI) ranged from 0.2 to 1 mg/L). The characteristics of ZSM-5 and CeO2 @ZSM-5 samples were determined by X-ray powder diffraction (XRD), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET)...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29754303/preparation-and-cr-vi-removal-performance-of-corncob-activated-carbon
#19
Hongyan Li, Pei Gao, Jianguo Cui, Feng Zhang, Fang Wang, Jici Cheng
Corncob activated carbon (CCAC) was prepared by a H3 PO4 activation method. The optimum conditions for the preparation of CCAC were determined by orthogonal experiments. The effects of pH, reaction time, CCAC dosage, and hexavalent chromium (Cr(VI)) concentrations on Cr(VI) removal by CCAC were studied. Corn straw activated carbon (CSAC) was also prepared using the optimum preparation conditions determined for CCAC. The properties of samples were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS)...
May 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29753720/enhanced-amperometric-detection-of-paracetamol-by-immobilized-cobalt-ion-on-functionalized-mwcnts-chitosan-thin-film
#20
Shamima Akhter, Wan Jefrey Basirun, Yatimah Alias, Mohd Rafie Johan, Samira Bagheri, Md Shalauddin, Magaji Ladan, Nadzirah Sofia Anuar
In the present study, a nanocomposite of f-MWCNTs-chitosan-Co was prepared by the immobilization of Co(II) on f-MWCNTs-chitosan by a self-assembly method and used for the quantitative determination of paracetamol (PR). The composite was characterized by field emission scanning electron microscopy (FESEM) and energy dispersive x-ray analysis (EDX). The electroactivity of cobalt immobilized on f-MWCNTs-chitosan was assessed during the electro-oxidation of paracetamol. The prepared GCE modified f-MWCNTs/CTS-Co showed strong electrocatalytic activity towards the oxidation of PR...
May 10, 2018: Analytical Biochemistry
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