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Sample preparation for scanning electron microscopy

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https://www.readbyqxmd.com/read/28314192/one-pot-preparation-of-conductive-composite-containing-boronic-acid-derivative-for-non-enzymatic-glucose-detection
#1
Wen Wang, Liyan Kong, Jiaming Zhu, Liang Tan
The composite consisting of poly(azure A), gold nanoparticles and 4-mercaptophenylboronic acid (PAA-AuNPs-MPBA) was prepared on the glassy carbon electrode surface by using a one-pot electropolymerization protocol. The generation of poly(azure A) film, the reduction of HAuCl4 and the binding of MPBA on metallic gold were simultaneously achieved in the cyclic voltammetric scan process, which was verified by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy measurements...
March 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28301973/beneficial-reuse-of-brest-harbor-france-dredged-sediment-as-alternative-material-in-road-building-laboratory-investigations
#2
Walid Maherzi, Mahfoud Benzerzour, Yannick Mamindy-Pajany, Eleanor Van Veen, Mohamed Boutouil, Edine Abriak Nor
ABSRACT The scarcity of natural aggregates promotes waste reuse as secondary raw material in the field of civil engineering. This article focuses on the beneficial reuse of marine dredged sediments in road building. Thus, mixtures of raw sediments and dredged sand collected from Brest Harbour (Bretagne, France) were treated with road hydraulic binders. Formulation were prepared and characterized as recommended by the French Technical Guidelines for soil treatment with lime and/or hydraulic binders. Mechanical resistance results are quite similar for the both hydraulic binders suggesting a similar reactivity with the studied sediment sample...
March 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28301333/a-new-micromechanical-approach-for-the-preparation-of-graphene-nanoplatelets-deposited-on-polyethylene
#3
Ubaldo Coscia, Mariano Palomba, Giuseppina Ambrosone, Gianni Barucca, Marcello Cabibbo, Paolo Mengucci, Riccardo de Asmundis, Gianfranco Carotenuto
An advantageous micromechanical technique to deposit large area graphene nanoplatelet thin films on low density polyethylene substrate is proposed. This method is based on the application of shear stress and friction forces to a graphite platelets/ethanol paste on the surface of a polymeric substrate and it allows to obtain a continuous film of superimposed nanoplatelets mainly made of 13-30 graphene layers. X-ray diffraction, atomic force and transmission electron microscopy measurements support the occurrence of a partial exfoliation of the graphite platelets due to shear stress and friction forces applied during film formation...
March 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28291792/synthesis-and-characterization-of-porous-silicon-as-hydroxyapatite-host-matrix-of-biomedical-applications
#4
A Dussan, S D Bertel, S F Melo, F Mesa
In this work, porous-silicon samples were prepared by electrochemical etching on p-type (B-doped) Silicon (Si) wafers. Hydrofluoric acid (HF)-ethanol (C2H5OH) [HF:Et] and Hydrofluoric acid (HF)-dimethylformamide (DMF-C3H7NO) [HF:DMF] solution concentrations were varied between [1:2]-[1:3] and [1:7]-[1:9], respectively. Effects of synthesis parameters, like current density, solution concentrations, reaction time, on morphological properties were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements...
2017: PloS One
https://www.readbyqxmd.com/read/28289762/extraction-and-preconcentration-of-organophosphorus-pesticides-in-water-by-using-a-polymethacrylate-based-sorbent-modified-with-magnetic-nanoparticles
#5
Susana Meseguer-Lloret, Sagrario Torres-Cartas, Mónica Catalá-Icardo, Ernesto F Simó-Alfonso, José M Herrero-Martínez
A polymethacrylate-based sorbent modified with magnetic nanoparticles (MNPs) has been synthesized and used as sorbent for solid-phase extraction (SPE) and magnetic solid-phase extraction (MSPE) of three organophosphorus pesticides (phosmet, pirimiphos-methyl, and chlorpyrifos) in water samples followed by high-performance liquid chromatography-diode array detection. The sorbent was prepared from a glycidyl methacrylate-based polymer, modified with a silanizing agent, followed by immobilization of MNPs on the surface of the material...
March 14, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28284767/fabrication-and-evaluation-of-a-fluorophilic-adsorbent-for-multiple-monolithic-fiber-solid-phase-microextraction-of-fluorobenzenes
#6
Yanmei Huang, Xiaojia Huang
A new type of highly fluorinated monolith (HFM) was fabricated and used as adsorbent of multiple monolithic fiber solid-phase microextraction (MMF-SPME). To prepare the HFM, a fluorinated monomer, 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl acrylate was in situ copolymerized with dual cross-linkers (divinylbenzene and ethylenedimethacrylate). The fabrication parameters including the content of monomer and porogenic solvent in the polymerization mixture were optimized to obtain expected extraction performance and life span...
March 3, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28284308/enzymatic-biosensor-based-on-entrapment-of-d-amino-acid-oxidase-on-gold-nanofilm-mwcnts-nanocomposite-modified-glassy-carbon-electrode-by-sol-gel-network-analytical-applications-for-d-alanine-in-human-serum
#7
Yalda Shoja, Amir Abbas Rafati, Javad Ghodsi
Sensing and determination of d-alanine is studied by using an enzymatic biosensor which was constructed on the basis of d-amino acid oxidase (DAAO) immobilization by sol-gel film onto glassy carbon electrode surface modified with nanocomposite of gold nanofilm (Au-NF) and multiwalled carbon nanotubes (MWCNTs). The Au-NF/MWCNT nanocomposite was prepared by applying the potentiostatic technique for electrodeposition of Au-NF on the MWCNT immobilized on glassy carbon electrode surface. The modified electrode is investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), linear sweep voltammetry (LSV) and cyclic voltammetry(CV) techniques...
May 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28283247/environmentally-friendly-and-non-polluting-solvent-pretreatment-of-palm-samples-for-polyphenol-analysis-using-choline-chloride-deep-eutectic-solvents
#8
Najing Fu, Runqiu Lv, Zhixin Guo, Yiwei Guo, Xiaoyu You, Baokun Tang, Dandan Han, Hongyuan Yan, Kyung Ho Row
In this work, choline chloride (ChCl) deep eutectic solvents (DESs) were evaluated for the pretreatment of palm samples in the analysis of polyphenols, such as protocatechuic acid, catechins, epicatechin, and caffeic acid. During the enrichment step of the pretreatment, eight DESs comprising ChCl with ethylene glycol (EG), glycerol (Gly), xylitol (Xyl), phenol (Ph), formic acid (FA), citric acid (CiA), oxalic acid (OA), or malonic acid (MA), were prepared and applied to the reflux extraction of polyphenols from palm samples...
February 21, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28281077/iron-based-adsorbent-prepared-from-litchi-peel-biomass-via-pyrolysis-process-for-the-removal-of-pharmaceutical-pollutant-from-synthetic-aqueous-solution
#9
Vitória Segabinazzi Foletto, Ananda Bulegon Ferreira, Eric da Cruz Severo, Gabriela Carvalho Collazzo, Edson Luiz Foletto, Guilherme Luiz Dotto
A porous iron-based adsorbent obtained from litchi peel via pyrolysis process was prepared in this work, in order to evaluate its adsorptive potential for the removal of a pharmaceutical dye (amaranth) from aqueous solution. The material was characterized by X-ray diffraction, nitrogen adsorption-desorption isotherms, and scanning electron microscopy. Several isotherm and kinetic models were tested aiming to represent the amaranth dye adsorption. The prepared sample presented magnetic property, and a mesoporous texture constituted of graphite and three iron-based phases...
March 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28274863/microfluidic-aided-fabrication-of-nanoparticles-blend-based-on-chitosan-for-a-transdermal-multidrug-delivery-application
#10
Mohammad Shamsi, Payam Zahedi, Hedayatollah Ghourchian, Sara Minaeian
The aim of this work was to provide a microfluidic-aided fabrication of nanoparticles based on chitosan/poly(N-isopropylacrylamide-co-acrylic acid)/cellulose laurate [CS/P(NIPAAm-co-AAc/CL] blend for transdermal multidrug delivery applications. The scanning electron microscopy (SEM) and dynamic light scattering (DLS) results showed that the diameter sizes of samples were in the range from 200 to 300nm along with a narrow size distribution. Also, the CS-based nanoparticles containing tretinoin and clindamycin phosphate prepared using microfluidic technique exhibited a sustained control release of the drugs as well as minimum inhibitory and bactericidal concentrations compared to the samples fabricated via bulk mixing method...
March 6, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28274088/synthesis-and-characterization-of-highly-intercalated-graphite-bisulfate
#11
Marcella Salvatore, Gianfranco Carotenuto, Sergio De Nicola, Carlo Camerlingo, Veronica Ambrogi, Cosimo Carfagna
Different chemical formulations for the synthesis of highly intercalated graphite bisulfate have been tested. In particular, nitric acid, potassium nitrate, potassium dichromate, potassium permanganate, sodium periodate, sodium chlorate, and hydrogen peroxide have been used in this synthesis scheme as the auxiliary reagent (oxidizing agent). In order to evaluate the presence of delamination, and pre-expansion phenomena, and the achieved intercalation degree in the prepared samples, the obtained graphite intercalation compounds have been characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRD), infrared spectroscopy (FT-IR), micro-Raman spectroscopy (μ-RS), and thermal analysis (TGA)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28273236/three-dimensional-structure-and-cytokine-distribution-of-platelet-rich-fibrin
#12
Meng-Yi Bai, Ching-Wei Wang, Jyun-Yi Wang, Ming-Fang Lin, Wing P Chan
OBJECTIVES: Previous reports have revealed that several cytokines (including platelet-derived growth factor-BB, transforming growth factors-β1 and insulin-like growth factor-1) can enhance the rate of bone formation and synthesis of extracellular matrix in orthopaedics or periodontology. This study aimed to determine the concentration of cytokines within platelet-rich fibrin microstructures and investigate whether there are differences in the different portions of platelet-rich fibrin, which has implications for proper clinical use of platelet-rich fibrin gel...
February 1, 2017: Clinics
https://www.readbyqxmd.com/read/28272356/influence-of-se-n-codoping-on-the-structural-optical-electronic-and-photocatalytic-properties-of-tio%C3%A2
#13
Yelda Y Gurkan, Esra Kasapbasi, Nazli Turkten, Zekiye Cinar
Se(4+) and N(3-) ions were used as codopants to enhance the photocatalytic activity of TiO₂ under sunlight irradiation. The Se/N codoped photocatalysts were prepared through a simple wet-impregnation method followed by heat treatment using SeCl₄ and urea as the dopant sources. The prepared photocatalysts were well characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-diffuse reflectance spectroscopy (UV-DRS), scanning electron microscopy (SEM) and Raman spectroscopy. The codoped samples showed photoabsorption in the visible light range from 430 nm extending up to 580 nm...
March 7, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28267486/renewable-hybrid-nanocatalyst-from-magnetite-and-cellulose-for-treatment-of-textile-effluents
#14
Ana Carolina Cunha Arantes, Crislaine das Graças Almeida, Ligiane Carolina Leite Dauzacker, Maria Lucia Bianchi, Delilah F Wood, Tina G Williams, William J Orts, Gustavo Henrique Denzin Tonoli
A hybrid catalyst was prepared using cellulose nanofibrils and magnetite to degrade organic compounds. Cellulose nanofibrils were isolated by mechanical defibrillation producing a suspension used as a matrix for magnetite particles. The solution of nanofibrils and magnetite was dried and milled resulting in a catalyst with a 1:1 ratio of cellulose and magnetite that was chemically and physically characterized using light, scanning electron and transmission electron microscopies, specific surface area analysis, vibrating sample magnetometry, thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray diffraction, catalytic potential and degradation kinetics...
May 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28266787/pipette-tip-solid-phase-extraction-based-on-deep-eutectic-solvent-modified-graphene-for-the-determination-of-sulfamerazine-in-river-water
#15
Lingling Liu, Weiyang Tang, Baokun Tang, Dandan Han, Kyung Ho Row, Tao Zhu
A green and novel deep-eutectic-solvent-modified graphene was prepared and worked as a neutral adsorbent for the rapid determination of sulfamerazine in a river water sample by pipette-tip solid-phase extraction. Compared with conventional graphene, deep-eutectic-solvent-modified graphene can change the surface of graphene with wrinkled structure and higher selective extraction ability. The properties of deep-eutectic-solvent-modified graphene and graphene were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis...
March 7, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28266182/introduction-of-a-coiled-solid-phase-microextraction-fiber-based-on-a-coating-of-animal-bone-waste-for-chromatographic-analysis
#16
Habib Razmi, Samaneh Farrokhzadeh
We attempt to introduce animal bone waste as a coating material with an organic-inorganic structure for the fabrication of a coiled solid-phase microextraction fiber for the first time. The coiled fiber was simply prepared with the use of copper wire and coated with bone waste suspension through the dip-coating method. The bone waste coating was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction analysis. It was applied as new type of solid-phase microextraction fiber for preconcentration of polycyclic aromatic hydrocarbons before determination by high-performance liquid chromatography with UV detection...
March 7, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28262316/an-imprinted-interpenetrating-polymer-network-for-microextraction-in-packed-syringe-of-carbamazepine
#17
Sara Asgari, Habib Bagheri, Ali Es-Haghi, Roya AminiTabrizi
An imprinted interpenetrating polymer network (IPN) was synthesized and used as a medium for isolation of carbamazepine from urine samples. The polymer network consisted of a homogeneous polystyrene-sol gel hybrid constructed by in-situ radical polymerization method. In this process, within the sol-gel reaction duration, styrene monomer could penetrate into the reaction mixture and after the polymerization initiation, a monolithic IPN structure was prepared. The scanning electron microscopy (SEM) image and energy dispersive spectroscopy (EDX) are indications of the polystyrene dispersion at nano- to micro-meter level in the sol gel matrix...
March 31, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28261988/a-core-shell-titanium-dioxide-polyaniline-nanocomposite-for-the-needle-trap-extraction-of-volatile-organic-compounds-in-urine-samples
#18
Solmaz Banihashemi, Habib Bagheri
We synthesized a titanium dioxide-polyaniline core-shell nanocomposite and implemented it as an efficient sorbent for the needle-trap extraction of some volatile organic compounds from urine samples. Polyaniline was synthesized, in the form of the emeraldine base, dissolved in dimethyl acetamide followed by diluting with water at pH 2.8, using the interfacial polymerization method. The TiO2 nanoparticles were encapsulated inside the conducting polymer shell, by adapting the in situ dispersing approach. The surface characteristics of the nanocomposite were investigated by Fourier transform infrared spectrometry, scanning electron microscopy and transmission electron microscopy...
March 6, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28259094/prediction-of-the-hydroxypropyl-cellulose-poly-vinyl-alcohol-ratio-in-aqueous-solution-containing-papaverine-hydrochloride-in-terms-of-drug-loaded-electrospun-fiber-formation
#19
Adrienn Kazsoki, Péter Szabó, Romána Zelkó
Papaverine hydrochloride loaded electrospun fibers were prepared for buccal drug delivery with the aim of improving the oral bioavailability of the crystalline drug, which can be achieved by the increased solubility and by the circumvention of the intensive first pass metabolism. The water soluble hydroxypropyl cellulose (HPC) was chosen as a mucoadhesive polymer. In order to improve the electrospinnability of HPC, the also mucoadhesive poly(vinyl alcohol) (PVA) was used. During the experiments, the total polymer concentration was kept constantly at 15% (w/w), and only the ratio of the two polymers was changed...
February 22, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28254326/direct-electrochemistry-and-electrocatalysis-of-lobetyolin-via-magnetic-functionalized-reduced-graphene-oxide-film-fabricated-electrochemical-sensor
#20
Bolu Sun, Xiaodan Gou, Ruibin Bai, Ahmed Attia Ahmed Abdelmoaty, Yuling Ma, Xiaoping Zheng, Fangdi Hu
A novel lobetyolin electrochemical sensor based on a magnetic functionalized reduced graphene oxide/Nafion nanohybrid film has been introduced in this work. The magnetic functionalized reduced graphene oxide was characterized by fourier transform infrared spectroscopy, atomic force microscope, X-ray diffraction, transmission electron microscopy and thermogravimetric analysis. The scanning electron microscopy characterized the morphology and microstructure of the prepared sensors, and the electrochemical effective surface areas of the prepared sensors were also calculated by chronocoulometry method...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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