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Sample preparation for scanning electron microscopy

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https://www.readbyqxmd.com/read/28437700/nanomolar-electrochemical-detection-of-caffeic-acid-in-fortified-wine-samples-based-on-gold-palladium-nanoparticles-decorated-graphene-flakes
#1
Kokulnathan Thangavelu, Nehru Raja, Shen-Ming Chen, Wei-Cheng Liao
Amalgamation of noble metal nanomaterials on graphene flakes potentially paves one way to improve their physicochemical properties. This paper deals with the simultaneous electrochemical deposition of gold and palladium nanoparticles on graphene flakes (Au/PdNPs-GRF) for the sensitive determination of caffeic acid (CA). The physiochemical properties of the prepared Au/PdNPs-GRF was characterized by using numerous analytical techniques such as scanning electron microscopy, electron dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, Raman spectroscopy and electrochemical impedance spectroscopy...
April 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28437133/the-impact-of-the-centrifuge-characteristics-and-centrifugation-protocols-on-the-cells-growth-factors-and-fibrin-architecture-of-a-leukocyte-and-platelet-rich-fibrin-l-prf-clot-and-membrane
#2
David M Dohan Ehrenfest, Nelson R Pinto, Andrea Pereda, Paula Jiménez, Marco Del Corso, Byung-Soo Kang, Mauricio Nally, Nicole Lanata, Hom-Lay Wang, Marc Quirynen
L-PRF (leukocyte- and platelet-rich fibrin) is one of the four families of platelet concentrates for surgical use and is widely used in oral and maxillofacial regenerative therapies. The first objective of this article was to evaluate the mechanical vibrations appearing during centrifugation in four models of commercially available table-top centrifuges used to produce L-PRF and the impact of the centrifuge characteristics on the cell and fibrin architecture of a L-PRF clot and membrane. The second objective of this article was to evaluate how changing some parameters of the L-PRF protocol may influence its biological signature, independently from the characteristics of the centrifuge...
April 24, 2017: Platelets
https://www.readbyqxmd.com/read/28429292/preparation-of-chloramphenicol-amino-acid-combinations-exhibiting-enhanced-dissolution-rates-and-reduced-drug-induced-oxidative-stress
#3
Vanesa B Sterren, Virginia Aiassa, Claudia Garnero, Yamila Garro Linck, Ana K Chattah, Gustavo A Monti, Marcela R Longhi, Ariana Zoppi
Chloramphenicol is an old antibiotic agent that is re-emerging as a valuable alternative for the treatment of multidrug-resistant pathogens. However, it exhibits suboptimal biopharmaceutical properties and toxicity profiles. In this work, chloramphenicol was combined with essential amino acids (arginine, cysteine, glycine, and leucine) with the aim of improving its dissolution rate and reduce its toxicity towards leukocytes. The chloramphenicol/amino acid solid samples were prepared by freeze-drying method and characterized in the solid state by using Fourier transform infrared spectroscopy, powder X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, and solid-state nuclear magnetic resonance...
April 20, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28428976/sem-and-afm-studies-of-two-phase-magnetic-alkali-borosilicate-glasses
#4
N Andreeva, M Tomkovich, A Naberezhnov, B Nacke, A Filimonov, O Alekseeva, P Vanina, V Nizhankovskii
The morphology and composition of four types of two-phase alkali borosilicate glasses with magnetic atoms prepared by inductive melting have been studied. The results of scanning electron microscopy point to uniform distribution of Na, Si, and O atoms in these samples while magnetic iron atoms form ball-shaped agglomerates. The magnetic properties of these agglomerates have been confirmed by magnetic force microscopy. Atomic force microscopy had shown that in these samples two different morphological structures, drop-like and dendrite net, are formed...
2017: TheScientificWorldJournal
https://www.readbyqxmd.com/read/28427663/fast-sono-assisted-ferrofluid-mediated-silver-super-adsorption-over-magnesium-ferrite-copper-sulfide-chalcogenide-with-the-aid-of-multivariate-optimization
#5
Ali Asghar Rezaei, Mostafa Hossein Beyki, Farzaneh Shemirani
This research focuses on the development of a fast ultrasonic assisted ferrofluid mediated methodology to obtain the optimum conditions for silver adsorption from aqueous solutions. For this purpose magnesium ferrite-copper sulfide chalcogenide was synthesized and employed as an efficient nanosorbent. The sorbent was characterized with energy-dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD) and vibrational sample magnetometry (VSM) techniques...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28426229/nanofabricated-catalyst-particles-for-the-investigation-of-catalytic-carbon-oxidation-by-oxygen-spillover
#6
Carl Justin Kamp, Hector Hugo Perez Garza, Hans O A Fredriksson, Bengt Herbert Kasemo, Bengt Andersson, Magnus Skoglundh
The catalytic oxidation of carbon by molecular oxygen was studied using C/Pt, Pt/C, Pt/Al2O3/C, Pt/CeO2/C, Al2O3/C and CeO2/C model samples prepared by hole-mask colloidal lithography. By this technique the degree of contact between platinum and carbon was controlled with high precision. The oxidation of carbon was monitored using atomic force microscopy and scanning electron microscopy. The results show that Pt in direct contact with carbon catalyzes the oxidation of carbon by spillover of dissociated oxygen from Pt to carbon...
April 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28421988/composite-magnetic-nanoparticles-cufe2o4-as-a-new-microsorbent-for-extraction-of-rhodamine-b-from-water-samples
#7
Ali Roostaie, Farzad Allahnoori, Shokooh Ehteshami
In this work, novel composite magnetic nanoparticles (CuFe2O4) were synthesized based on sol-gel combustion in the laboratory. Next, a simple production method was optimized for the preparation of the copper nanoferrites (CuFe2O4), which are stable in water, magnetically active, and have a high specific area used as sorbent material for organic dye extraction in water solution. CuFe2O4 nanopowders were characterized by field-emission scanning electron microscopy (SEM), FTIR spectroscopy, and energy dispersive X-ray spectroscopy...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28417177/in-situ-hydrothermal-synthesis-of-titanium-dioxide-nanorods-on-titanium-wire-for-solid-phase-microextraction-of-polycyclic-aromatic-hydrocarbons
#8
Yu Tian, Juanjuan Feng, Yanan Bu, Xiuqin Wang, Chuannan Luo, Min Sun
Titanium dioxide nanorods were prepared on the surface of titanium wire by hydrothermal synthesis for use as a solid-phase microextraction (SPME) fiber. The morphology of the SPME coating was observed by scanning electron microscopy (SEM). Employed in conjunction with gas chromatography (GC), the fiber was investigated with five polycyclic aromatic hydrocarbons (PAHs) and three terphenyls in direct-immersion extraction mode. Various parameters were optimized, such as the extraction time, the stirring rate, the extraction temperature, the ionic strength of the sample solution, and the desorption time...
April 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28415551/a-biodegradable-az91-magnesium-alloy-coated-with-a-thin-nanostructured-hydroxyapatite-for-improving-the-corrosion-resistance
#9
T M Mukhametkaliyev, M A Surmeneva, A Vladescu, C M Cotrut, M Braic, M Dinu, M D Vranceanu, I Pana, M Mueller, R A Surmenev
The main aim of this study was to investigate the properties of an AZ91 alloy coated with nanostructured hydroxyapatite (HA) prepared by radio frequency (RF) magnetron sputtering. The bioactivity and biomineralization of the AZ91 magnesium alloy coated with HA were investigated in simulated body fluid (SBF) via an in vitro test. Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) analyses were performed. The samples were immersed in SBF to study the ability of the surface to promote the formation of an apatite layer as well as corrosion resistance and mass change of the HA-coated AZ91 alloy...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415474/palladium-nanoparticles-in-electrochemical-sensing-of-trace-terazosin-in-human-serum-and-pharmaceutical-preparations
#10
Yasaman Sefid-Sefidehkhan, Khadijeh Nekoueian, Mandana Amiri, Mika Sillanpaa, Habibollah Eskandari
In this approach, palladium nanoparticle film was simply fabricated on the surface of carbon paste electrode by electrochemical deposition method. The film was characterized using scanning electron microscopy, electrochemical impedance spectroscopy and cyclic voltammetry. The prepared electrode exhibited an excellent electrocatalytic activity toward detection of trace amounts of terazosin, which is an antihypertensive drug. Under the optimum experimental conditions, a linear range of 1.0×10(-8)-1.0×10(-3)molL(-1) with a detection limit of 1...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415435/developing-an-electrochemical-sensor-based-on-a-carbon-paste-electrode-modified-with-nano-composite-of-reduced-graphene-oxide-and-cufe2o4-nanoparticles-for-determination-of-hydrogen-peroxide
#11
Ali Benvidi, Mohammad Taghi Nafar, Shahriar Jahanbani, Marzieh Dehghan Tezerjani, Masoud Rezaeinasab, Sudabeh Dalirnasab
In this paper, a highly sensitive voltammetric sensor based on a carbon paste electrode with CuFe2O4 nanoparticle (RGO/CuFe2O4/CPE) was designed for determination of hydrogen peroxide (H2O2). The electrocatalytic reduction of H2O2 was examined using various techniques such as cyclic voltammetry (CV), chronoamperometry, amperometry and differential pulse voltammetry (DPV). CuFe2O4 nanoparticles were synthesized by co-precipitation method and characterized with scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) techniques...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28414987/effects-of-different-radiation-doses-on-the-microhardness-superficial-morphology-and-mineral-components-of-human-enamel
#12
Sandra Ribeiro de Barros da Cunha, Felipe Paiva Fonseca, Pedro Augusto Minorin Mendes Ramos, Cecília Maria Kalil Haddad, Eduardo Rodrigues Fregnani, Ana Cecília Corrêa Aranha
OBJECTIVE: To evaluate the effects of three different radiotherapy doses (20, 40, and 70Gy) on the microhardness, superficial morphology, and mineral content (based on Ca and P values) of three different depths of human enamel (cervical, middle, and occlusal). DESIGN: Thirty-four third molars were cut, separated, and prepared. Microhardness samples (n=30) were embedded in acrylic resin and then polished, and depths were delimited. Microhardness tests were performed on cervical, middle, and occlusal enamel pre- and post-radiotherapy with a load of 50g for 30s...
April 10, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28411819/an-electrochemical-bisphenol-a-sensor-based-on-one-step-electrochemical-reduction-of-cuprous-oxide-wrapped-graphene-oxide-nanoparticles-modified-electrode
#13
Rongguang Shi, Jing Liang, Zongshan Zhao, Aifeng Liu, Yong Tian
Bisphenol A (BPA), as an important industrial material, has been widespread concerned in recent years as its endocrine disrupting effect. This study reported a novel bisphenol A sensor via a facile one step electrochemical reduction of graphene oxide (rGO) and cuprous oxide (Cu2O) nanocomposite modified glassy carbon electrodes. The characterization of the fabricated sensor was performed by scanning electron microscopy and X-ray spectroscopy. The prepared Cu2O-rGO electrode presented fast response, high sensitivity and low background current...
July 1, 2017: Talanta
https://www.readbyqxmd.com/read/28411807/a-sensitive-and-disposable-indium-tin-oxide-based-electrochemical-immunosensor-for-label-free-detection-of-mage-1
#14
Burçak Demirbakan, Mustafa Kemal Sezgintürk
MAGE-1 (MAGE, for melanoma antigen), was identified by virtue of its processing and cell surface expression as a tumor-specific peptide bound to major histocompatibility complexes which was reactive with autolytic T cells. 3-Glycidoxypropyltrimethoxysilane (3-GOPS) is frequently employed for the preparation of dense heterometal hybrid polymers which are used, e.g., for hard coatings of organic polymers and contact lens materials in the optical industry. In this study, we have improved a new immunological biosensor with indium tin oxide (ITO)...
July 1, 2017: Talanta
https://www.readbyqxmd.com/read/28411434/synthesis-and-characterization-of-nife2o4-cu-nanoparticles-as-a-magnetically-recoverable-catalyst-for-reduction-of-nitroarenes-to-arylamines-with-nabh4
#15
Behzad Zeynizadeh, Iman Mohammadzadeh, Zahra Shokri, Seyed Ali Hosseini
In this research, a simple and efficient method for synthesis of magnetically separable NiFe2O4@Cu nanocomposite under co-precipitation conditions was described. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic absorption spectroscopy (AAS), Brunauer-Emmett-Teller (BET) and vibrating sample magnetometer (VSM) analyses confirmed the construction of NiFe2O4@Cu nanoparticles. The prepared core-shell nanocomposite showed a satisfactory catalytic activity for NaBH4 reduction of nitroarenes to arylamines...
March 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28411421/influence-of-the-silver-deposition-method-on-the-activity-of-platforms-for-chemometric-surface-enhanced-raman-scattering-measurements-silver-films-on-zro2-nanopore-arrays
#16
Marcin Pisarek, Jan Krajczewski, Ewa Wierzbicka, Marcin Hołdyński, Grzegorz D Sulka, Robert Nowakowski, Andrzej Kudelski, Maria Janik-Czachor
Deposition of plazmonic metal nanoparticles on nanostructured oxide templates is an important part in preparation and design of suitable substrates for surface-enhanced Raman scattering (SERS) measurements. In this contribution we analyze the influence of the Ag deposition methods (magnetron sputtering and evaporation in vacuum, which are often used interchangeably) on SERS activity of the resultant Ag-n/ZrO2/Zr composite samples fabricated. We found that deposition of the same amount of Ag (0.020mg/cm(2)) on the ZrO2 nanoporous layers using magnetron sputtering and evaporation in vacuum leads to formation of two different surface morphologies, which can be distinguished on the basis of high-resolution scanning electron microscopy (HR-SEM) measurements...
April 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28410800/superparamagnetic-graphene-oxide-based-dispersive-solid-phase-extraction-for-preconcentration-and-determination-of-tamsulosin-hydrochloride-in-human-plasma-by-high-performance-liquid-chromatography-ultraviolet-detection
#17
Yaser Pashaei, Fatemeh Ghorbani-Bidkorbeh, Maryam Shekarchi
In the present study, superparamagnetic graphene oxide-Fe3O4 nanocomposites were successfully prepared by a modified impregnation method (MGOmi) and their application as a sorbent in the magnetic-dispersive solid phase extraction (M-dSPE) mode to the preconcentration and determination of tamsulosin hydrochloride (TMS) in human plasma was investigated by coupling with high performance liquid chromatography-ultraviolet detection (HPLC-UV). The structure, morphology and magnetic properties of the prepared nanocomposites were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and vibrating sample magnetometry (VSM)...
March 19, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28410540/moderated-surface-defects-of-ni-particles-encapsulated-with-nio-nanofibers-as-supercapacitor-with-high-capacitance-and-energy-density
#18
Yifan Zhang, Mira Park, Hak Yong Kim, Soo-Jin Park
Nickel oxide is a promising material for supercapacitors owing to its high theoretical specific capacitance; however, its practical capacitance is far below the theoretical limit. In this work, we report a novel Ni/NiO composite supported by carbon nanofibers as a pseudocapacitor electrode. Characterization of this sample by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller analysis, and contact angle measurements revealed that Ni nanoparticles were uniformly dispersed on the surface of the nanofibers, leading to strong metal-metal oxide interactions and the formation of oxygen vacancies...
April 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28402143/a-ph-independent-instantaneous-release-of-flurbiprofen-a-study-of-the-preparation-of-complexes-their-characterization-and-in-vitro-vivo-evaluation
#19
Han-Bing Wang, Fei-Fei Yang, Gai Xiu-Mei, Bing-Chao Cheng, Jin-Yu Li, Hao Pan, Xing-Gang Yang, Wei-San Pan
In this study, furbiprofen/hydroxypropyl-β-cyclodextrin (HPβCD) inclusion complexes were prepared to improve the drug dissolution and facilitate its application in hydrophilic gels. Inclusion complexes were prepared using a supercritical fluid (SCF) processing and a conventional optimized co-lypholization (OCL) method was employed as a reference. The entrapment efficacy (EE) and drug loading (DL) of both methods were investigated. Evaluation of drug dissolution enhancement was conducted in deionized water as well as buffer solutions of different pH...
April 12, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28395235/enhanced-removal-of-phosphate-and-nitrate-ions-from-aqueous-media-using-nanosized-lanthanum-hydrous-doped-on-magnetic-graphene-nanocomposite
#20
Hamid Rashidi Nodeh, Hassan Sereshti, Elham Zamiri Afsharian, Nina Nouri
A novel nanocomposite adsorbent based on nanosized lanthanum hydroxide doped onto magnetic reduced graphene oxide (MG@La) was synthesized and used for removal of phosphate and nitrate ions from river and sewage media. The composition, surface properties and morphology of the as prepared adsorbent were studied using Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM). The influence of main parameters on the efficiency of removal process including adsorbent dosage, salt addition, solution pH, contact time, and concentration of the analytes were thoroughly investigated...
April 6, 2017: Journal of Environmental Management
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