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Sample preparation for scanning electron microscopy

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https://www.readbyqxmd.com/read/28219034/preparation-of-core-shell-nanostructure-fe3o4-peg400-so3h-as-heterogeneous-and-magnetically-recyclable-nanocatalyst-for-one-pot-synthesis-of-substituted-pyrroles-by-paal-knorr-reaction-at-room-temperature
#1
Fahimeh Bonyasi, Malak Hekmati, Hojat Veisi
An efficient procedure has been proposed for the loading of sulfonic acid groups on the surface of polyethylene glycol 400 (PEG400)-encapsulated Fe3O4 nanoparticles to synthesize a core-shell Fe3O4@PEG400-SO3H nano catalyst. Surface functionalization of magnetic particles in such a way is a refined method of bridging the gap amongst heterogeneous and homogeneous catalysis. The procured nano catalyst was classified through Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), wavelength-dispersive X-ray spectroscopy (WDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), BET, and back titration...
February 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28217859/aminosilanized-magnetic-carbon-microspheres-for-the-magnetic-solid-phase-extraction-of-bisphenol-a-bisphenol-af-and-tetrabromobisphenol-a-from-environmental-water-samples
#2
Sheng-Xiang Gong, Xiao-Li Wang, Wei Liu, Ming-Lin Wang, Xia Wang, Zheng-Wu Wang, Ru-Song Zhao
Aminosilanized magnetic carbon microspheres as a novel adsorbent were designed and fabricated. And the adsorbent was used for the magnetic solid-phase extraction of bisphenols at trace levels from environmental water samples before liquid chromatography with tandem mass spectrometry analysis. The structure, surface and magnetic behavior of the as-prepared aminosilanized magnetic carbon microspheres were characterized by elemental analysis, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, and vibrating sample magnetometry...
February 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28214626/green-synthesis-of-a-novel-flower-like-cerium-vanadate-microstructure-for-electrochemical-detection-of-tryptophan-in-food-and-biological-samples
#3
J Vinoth Kumar, R Karthik, Shen-Ming Chen, S Marikkani, A Elangovan, V Muthuraj
In this present investigation, we introduced a novel electrochemical sensor for the detection of tryptophan (TRP) based on green pompoms flower-like cerium vanadate (CeVO4). The flower-like CeVO4 microstructure was prepared by the simple hydrothermal treatment with the assistance of urea for the first time. The as-prepared flower-like CeVO4 microstructure was characterized by various analytical and spectroscopic techniques such as X-ray diffraction, Raman spectroscopy fourier transform infrared spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy studies...
February 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28214624/effect-of-cobalt-loading-on-the-solid-state-properties-and-ethyl-acetate-oxidation-performance-of-cobalt-cerium-mixed-oxides
#4
M Konsolakis, S A C Carabineiro, G E Marnellos, M F Asad, O S G P Soares, M F R Pereira, J J M Órfão, J L Figueiredo
Cobalt-cerium mixed oxides were prepared by the wet impregnation method and evaluated for volatile organic compounds (VOCs) abatement, using ethyl acetate (EtAc) as model molecule. The impact of Co content on the physicochemical characteristics of catalysts and EtAc conversion was investigated. The materials were characterized by various techniques, including N2 adsorption at -196°C, scanning electron microscopy (SEM), X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS) to reveal the structure-activity relationship...
February 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213265/magnetic-mixed-hemimicelles-dispersive-solid-phase-extraction-based-on-ionic-liquid-coated-attapulgite-polyaniline-polypyrrole-fe3o4-nanocomposites-for-determination-of-acaricides-in-fruit-juice-prior-to-high-performance-liquid-chromatography-diode-array-detection
#5
Xiaoling Yang, Kexin Qiao, Fang Liu, Xiaoling Wu, Miyi Yang, Jing Li, Haixiang Gao, Sanbing Zhang, Wenfeng Zhou, Runhua Lu
In this research, a novel method using magnetic mixed hemimicelles dispersive solid-phase extraction (MMHDSPE) based on C16mimBr-coated attapulgite/polyaniline-polypyrrole/Fe3O4 (ATP/PANI-PPY/Fe3O4) nanocomposites were investigated for enrichment and separation of three acaricides in fruit juice. In this method, we combined the simplicity and speed of dispersive solid-phase extraction, the advantages of mixed hemimicelles and the facility of the phase separation of the magnetic nanoparticles to develop a simple, rapid, sensitive, and effective method for detecting target analytes from the juice samples...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213238/preparation-and-evaluation-of-magnetic-core-shell-mesoporous-molecularly-imprinted-polymers-for-selective-adsorption-of-tetrabromobisphenol-s
#6
Xuemei Wang, Pengfei Huang, Xiaomin Ma, Huan Wang, Xiaoquan Lu, Xinzhen Du
Novel magnetic mesoporous molecularly imprinted polymers (MMIPs) with core-shell structure were prepared by simple surface molecular imprinting polymerization using tetrabromobisphenol-S (TBBPS) as the template. The MMIPs-TBBPS were characterized by fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption transmission, and vibrating sample magnetometry. The resultant MMIPs-TBBPS were successfully applied magnetic solid-phase extraction (MSPE) coupled with HPLC determination of TBBPS in spiked real water samples with recoveries of 77...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28207835/identification-of-plant-cells-in-black-pigments-of-prehistoric-spanish-levantine-rock-art-by-means-of-a-multi-analytical-approach-a-new-method-for-social-identity-materialization-using-cha%C3%A3-ne-op%C3%A3-ratoire
#7
Esther López-Montalvo, Clodoaldo Roldán, Ernestina Badal, Sonia Murcia-Mascarós, Valentín Villaverde
We present a new multi-analytical approach to the characterization of black pigments in Spanish Levantine rock art. This new protocol seeks to identify the raw materials that were used, as well as reconstruct the different technical gestures and decision-making processes involved in the obtaining of these black pigments. For the first of these goals, the pictorial matter of the black figurative motifs documented at the Les Dogues rock art shelter (Ares del Maestre, Castellón, Spain) was characterized through the combination of physicochemical and archeobotanical analyses...
2017: PloS One
https://www.readbyqxmd.com/read/28206760/nano-engineered-eggshell-silver-tailored-co-polyester-polymer-blend-film-with-antimicrobial-properties
#8
Boniface J Tiimob, Gregory Mwinyelle, Woubit Abdela, Temesgen Samuel, Shaik Jeelani, Vijaya K Rangari
In this study, the reinforcement effect of different proportions of eggshell/silver nanomaterial (ES-Ag) on structural and antimicrobial properties of 70/30 poly (butylene-co-adipate terephthalate)/polylactic acid (PBAT/PLA) immiscible blends were investigated. The ES-Ag was synthesized using a single step ball milling process, and characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). These results confirmed the existence of silver nanoparticles (Ag NPs) in the interstitial spaces of the eggshell particles...
February 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28195398/preparation-of-magnetic-mesoporous-silica-composite-for-the-solid-phase-microextraction-of-diazinon-and-malathion-before-their-determination-by-high-performance-liquid-chromatography
#9
Alireza Bazmandegan-Shamili, Ali Mohammad Haji Shabani, Shayessteh Dadfarnia, Masoud Rohani Moghadam, Mahboubeh Saeidi
A novel magnetic mesoporous silica material was synthesized and used as the sorbent for the magnetic solid-phase microextraction of diazinon and malathion before their quantification by high-performance liquid chromatography with UV detection. The sorbent was synthesized by a surfactant-templated one-pot sol-gel procedure using SiO2 -coated Fe3 O4 as the magnetic support, cetyltrimethylammonium bromide as the template and tetraethyl orthosilicate as the silicon source. The characteristics of the prepared sorbent were investigated using FTIR spectroscopy, scanning electron microscopy, and X-ray diffraction...
February 13, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28194874/preparation-and-characterization-of-a-silk-fibroin-calcium-sulfate-bone-cement
#10
Fuzhan Zhang, Hai Zhu, Genlin Wang, Jile Xie, Yunxia Tao, Wei Xia, Huilin Yang
This study aimed to prepare and characterize a silk fibroin/calcium sulfate (SF/CS) bone cement. SF solutions of the following concentrations 3, 4.5, 6, 7.5, and 9 g/L were used to prepare bone cement samples with SF-to-CS ratios of 0.35, 0.40, 0.45, 0.50, and 0.55 mL of SF solutions (or water as control) per g of CS. Compressive strength, setting time, degradation when immersed in phosphate-buffered saline, X-ray diffraction, Fourier infrared spectroscopy, and scanning electron microscopy were used to characterize the SF/CS bone cement...
February 14, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28193044/engineered-iro2-nio-core-shell-nanowires-for-sensitive-non-enzymatic-detection-of-trace-glucose-in-saliva
#11
Junjun Wang, Lin Xu, Yang Lu, Kuang Sheng, Wei Liu, Cong Chen, Yang Li, Biao Dong, Hongwei Song
Hierarchical core-shell IrO2@NiO nanowires (NWs) have been designed through two simple steps, which combined electrospinning of IrO2 conductive core and chemical bath deposition growth of ultracontinuous NiO nanoflakes. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy-dispersive X-ray spectrometry mapping, and X-ray photoelectron spectroscopy were employed to characterize the morphologies and structures of the as-prepared samples, and the results were also carefully compared with that of pure NiO nanoflowers and IrO2 NWs...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28190596/facile-and-fast-preparation-of-low-cost-silica-supported-graphitic-carbon-nitride-for-solid-phase-extraction-of-fluoroquinolone-drugs-from-environmental-waters
#12
Andrea Speltini, Federica Maraschi, Roberta Govoni, Chiara Milanese, Antonella Profumo, Lorenzo Malavasi, Michela Sturini
The analytical application of silica-supported graphitic carbon nitride (g-C3N4@silica) for solid-phase extraction (SPE) of fluoroquinolone (FQ) pollutants from water is presented for the first time. g-C3N4@silica was easily and quickly prepared by one-pot thermal condensation of dicyandiamide and characterized by powder X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, Fourier transform infrared spectroscopy and surface area measurements. The novel composite was applied as sorbent for SPE of FQs from water prior high-performance liquid chromatography with fluorescence detection...
February 3, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28183658/antifungal-activity-of-wide-band-gap-thioglycolic-acid-capped-zns-mn-semiconductor-nanoparticles-against-some-pathogenic-fungi
#13
Isam M Ibrahim, Iftikhar M Ali, Batol Imran Dheeb, Qayes A Abas, Asmeit Ramizy, M H Eisa, A I Aljameel
The manganese doped zinc sulfide nanoparticles were synthesized by simple aqueous chemical reaction of manganese chloride, zinc acetate and thioacitamide in aqueous solution. Thioglycolic acid is used as capping agent for controlling the nanoparticle size. The main advantage of the ZnS:Mn nanoparticles of diameter ~2.73nm is that the sample is prepared by using non-toxic precursors in a cost effective and eco-friendly way. The structural, morphological and chemical composition of the nanoparticles have been investigated by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) with energy dispersion spectroscopy (EDS) and Fourier transform infrared (FTIR) spectroscopy...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183589/terbinafine-loaded-wound-dressing-for-chronic-superficial-fungal-infections
#14
Farnoush Asghari Paskiabi, Shahin Bonakdar, Mohammad Ali Shokrgozar, Mohammad Imani, Zahra Jahanshiri, Masoomeh Shams-Ghahfarokhi, Mehdi Razzaghi-Abyaneh
In spite of developing new drugs and modern formulations, the treatments of chronic fungal infections are still challenging. Fibrous wound dressings are new suggestions for the treatment of chronic superficial infections. In the present study, we formulated an antifungal agent, terbinafine hydrochloride (TFH), which is a hydrophobic drug, in wound dressings prepared by electrospun polycaprolactone, polycaprolactone/gelatin (50:50 w/w) and gelatin. To obtain more water-stable meshes, the preparations were treated by glutaraldehyde and their properties were determined before and after treatment...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183011/semi-degradable-porous-poly-vinyl-alcohol-hydrogel-scaffold-for-cartilage-repair-evaluation-of-the-initial-and-cell-cultured-tribological-properties
#15
Yi Cao, Dangsheng Xiong, Kun Wang, Yuxiang Niu
Tissue engineering for articular cartilage repair has shown success in ensuring the integration of neocartilage with surrounding tissue, but the rapid restoration of biomechanical and biotribological functions remains a significant challenge. Poly (vinyl alcohol) (PVA) hydrogel is regarded as a potential articular cartilage replacement for its fair mechanical strength and low surface friction, while its lack of bioactivity limits its utility. Combining the advantages of tissue engineering materials and PVA hydrogel, we developed a semi-degradable porous PVA hydrogel through addition of ploy (lactic-co-glycolic acid) (PLGA) microspheres and salt-leaching technique...
February 2, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28181395/preparation-of-a-polymer-monolith-modified-with-delaminated-layered-double-hydroxides-for-the-microextraction-of-%C3%AE-agonists
#16
Yufeng Zhou, Haijiao Zheng, Jiutong Ma, Qiong Jia
In the present study, a novel poly(acrylamide-co-N-isopropylacrylamide-co-ethylene dimethacrylate) monolithic column modified with saline-modified delaminated layered double hydroxides was developed and exploited as the stationary phase in polymer monolith microextraction of β-agonists. Transmission electron microscopy, FTIR spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and thermal gravimetric analysis with derivative thermogravimetric determination were employed to characterize the monoliths...
February 8, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28181161/mechanical-dielectric-and-spectroscopic-characteristics-of-micro-nanocellulose-oxide-composites
#17
Maksym Nedielko, Smail Hamamda, Olexander Alekseev, Vitalii Chornii, Mykola Dashevskii, Maksym Lazarenko, Kostiantyn Kovalov, Sergii G Nedilko, Sergii Tkachov, Sergiy Revo, Vasyl Scherbatskyi
The set of composite materials that consist of micro/nanocellulose and complex K2Eu(MoO4)(PO4) luminescent oxide particles was prepared. The composites were studied by means of scanning electron microscopy, XRD analysis, dilatometry, differential scanning calorimetry and thermogravimetric analysis, and dielectric and luminescence spectroscopy.Dependencies of density, crystallinity, relative extension, thermal extension coefficient, dielectric relaxation parameters, intensity and shape of photoluminescence bands on temperature, and content of oxide component were studied...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28168865/preparation-of-magnetic-molecularly-imprinted-polymer-nanoparticles-by-surface-imprinting-by-a-sol-gel-process-for-the-selective-and-rapid-removal-of-di-2-ethylhexyl-phthalate-from-aqueous-solution
#18
Chunying Li, Xiaoguo Ma, Xiaojun Zhang, Rui Wang, Xin Li, Qianjun Liu
Magnetic molecularly imprinted polymer nanoparticles for di-(2-ethylhexyl) phthalate were synthesized by surface imprinting technology with a sol-gel process and used for the selective and rapid adsorption and removal of di-(2-ethylhexyl) phthalate from aqueous solution. The prepared magnetic molecularly imprinted polymer nanoparticles were characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and vibrating sample magnetometry. The adsorption of di-(2-ethylhexyl) phthalate onto the magnetic molecularly imprinted polymer was spontaneous and endothermic...
February 7, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28167274/characterization-of-human-leukocyte-huvec-adhesion-effect-of-cell-preparation-methods
#19
Franca Marino, Laura Schembri, Emanuela Rasini, Monica Pinoli, Angela Scanzano, Alessandra Luini, Terenzio Congiu, Marco Cosentino
OBJECTIVE: Sample manipulation to obtain isolated granulocytes represents a key, and often necessary, step in the in vitro studies. We investigated by the means of flow cytometry and microscopic techniques (both optical microscopy [OM] and scanning electron microscopy [SEM]), the granulocyte-endothelium adhesion and the role of sample manipulation. METHODS: By means of a co-culture method, we have analysed the adhesion of human leukocytes, originated from two different blood samples (fresh venous blood [FB] and buffy coat [BC]), to the human umbilical venous endothelial cell (HUVEC) monolayer...
February 3, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28166408/characterization-of-the-particle-size-and-polydispersity-of-dicumarol-using-solid-state-nmr-spectroscopy
#20
Kassibla Elodie Dempah, Joseph W Lubach, Eric J Munson
A variety of particle sizes of a model compound, dicumarol, were prepared and characterized in order to investigate the correlation between particle size and solid-state NMR (SSNMR) proton spin-lattice relaxation ((1)H T1) times. Conventional laser diffraction and scanning electron microscopy were used as particle size measurement techniques and showed crystalline dicumarol samples with sizes ranging from tens of micrometers to a few micrometers. Dicumarol samples were prepared using both bottom-up and top-down particle size control approaches, via antisolvent microprecipitation and cryogrinding...
February 15, 2017: Molecular Pharmaceutics
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