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Sample preparation for scanning electron microscopy

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https://www.readbyqxmd.com/read/29342422/magnetic-mesoporous-molecularly-imprinted-polymers-based-on-surface-precipitation-polymerization-for-selective-enrichment-of-triclosan-and-triclocarban
#1
Xuemei Wang, Pengfei Huang, Xiaomin Ma, Xinzhen Du, Xiaoquan Lu
Novel magnetic mesoporous molecularly imprinted polymers (MMIPs) were prepared based on surface precipitation polymerization using Triclosan (TCS) as template and methacrylic acid as functional monomer. The synthesized MMIPs-TCS were applied to the adsorbent of magnetic solid-phase extraction (MSPE) coupled with HPLC for the enrichment and determination of TCS. The MMIPs-TCS were characterized by fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption transmission, and vibrating sample magnetometry...
January 10, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29342088/synthesis-and-characterization-of-wo%C3%A2-graphene-nanocomposites-for-enhanced-photocatalytic-activities-by-one-step-in-situ-hydrothermal-reaction
#2
Xiaoxiao Hu, Peiquan Xu, Hongying Gong, Guotao Yin
Tungsten trioxide (WO₃) nanorods are synthesized on the surface of graphene (GR) sheets by using a one-step in-situ hydrothermal method employing sodium tungstate (Na₂WO₄·2H₂O) and graphene oxide (GO) as precursors. The resulting WO₃/GR nanocomposites are characterized by X-ray diffraction, Raman spectroscopy, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The results confirm that the interface between WO₃ nanorod and graphene contains chemical bonds...
January 17, 2018: Materials
https://www.readbyqxmd.com/read/29339615/adsorption-performance-of-polydopamine-modified-attapulgite-granular-adsorbent-for-methylene-blue
#3
Weisheng Zheng, Hailing Wang, Zhaolian Zhu, Peng Wei
Polydopamine-modified granule organo-attapulgite adsorbent (PDA-GOAT) was facilely prepared via a dip-coating approach. The samples were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Surface area and pore size were calculated from the Brunauer-Emmett-Teller method by N2 adsorption-desorption isotherm. The adsorption behaviour of methylene blue (MB) onto PDA-GOAT was systematically investigated. The experimental data revealed that the adsorption process fitted well with the pseudo-second-order kinetics equation and the adsorption isotherm fitted better with the Langmuir model...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339135/quantitative-monitoring-the-anti-solvent-crystallization-and-storage-process-for-nandrolone-by-near-infrared-spectroscopy
#4
Xia Zeng, Xinnuo Xiong, Hongqin Yang, Bin Tang, Qiaohong Du, Quan Hou, Zili Suo, Hui Li
A novel hydrate (SH2O) of nandrolone (NT) was prepared by anti-solvent methods. The crystallization processes with two schemes (A and B) were monitored by in-line near-infrared (NIR) spectroscopy. The amounts of SH2O in powder samples obtained by the anti-solvent crystallization and storage process were quantified by NIR combined with chemometrics methods. In-line NIR spectra from 4500 to 8000 cm-1 were chosen to capture physicochemical changes during the whole crystallization process. The combination of the principal component (PCA) results with offline characterization (scanning electron microscopy, powder x-ray diffraction, NIR) data showed that both schemes yielded high purity SH2O products, but the crystallization speed of Scheme B was significantly accelerated...
January 12, 2018: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29338270/effect-of-calcium-on-the-microstructure-and-corrosion-behavior-of-microarc-oxidized-mg-xca-alloys
#5
Yaokun Pan, Chuanzhong Chen, Rui Feng, Hongwei Cui, Benkui Gong, Tingting Zheng, Yarou Ji
Magnesium alloys are potential biodegradable implants for biomedical applications, and calcium (Ca) is one kind of ideal element being examined for magnesium alloys and biodegradable ceramic coatings owing to its biocompatibility and mechanical suitability. In this study, microarc oxidation (MAO) coatings were prepared on Mg-xCa alloys to study the effect of Ca on the microstructure and corrosion resistance of Mg-xCa alloys and their surface MAO coatings. The electrochemical corrosion behavior was investigated using an electrochemical workstation, and the degradability and bioactivity were evaluated by soaking tests in simulated body fluid (SBF) solutions...
January 16, 2018: Biointerphases
https://www.readbyqxmd.com/read/29337099/facile-preparation-and-characterization-of-ph-sensitive-mt-cmc-nanocomposite-hydrogel-beads-for-propranolol-controlled-release
#6
Hassan Farhadnejad, Seyed Alireza Mortazavi, Mohammad Erfan, Behzad Darbasizadeh, Hamidreza Motasadizadeh, Yousef Fatahi
The main aim of the present study was to design pH-sensitive nanocomposite hydrogel beads, based on carboxymethyl cellulose (CMC) and montmorillonite (Mt)-propranolol (PPN) nanohybrid, and evaluate whether the prepared nanocomposite beads could potentially be used as oral drug delivery systems. PPN-as a model drug-was intercalated into the interlayer space of Mt clay mineral via the ion exchange procedure. The resultant nanohybrid (Mt-PPN) was applied to fabricate nanocomposite hydrogel beads by association with carboxymethyl cellulose...
January 11, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29334076/pt-decorated-mos-sub-2-sub-nanoflakes-for-ultrasensitive-resistive-humidity-sensor
#7
Debasree Burman, Sumita Santra, Panchanan Pramanik, Prasanta Kumar Guha
In this work, we report the fabrication of a low power, humidity sensor where platinum nanoparticles (NPs) decorated few-layered Molybdenum disulphide (MoS<sub>2</sub>) nanoflakes have been used as the sensing layer. A mixed solvent was used to exfoliate the nanoflakes from the bulk powder. Then the Pt/MoS<sub>2</sub> composites were prepared by reducing Pt NPs from chloroplatinic acid hexahydrate using a novel reduction technique using sulfide salt. The successful reduction and composite preparation were confirmed using various material characterization tools like Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy and UV-visible spectroscopy (UV-Vis)...
January 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29333771/-effect-of-hydrofluoric-acid-concentration-on-the-surface-morphology-and-bonding-effectiveness-of-lithium-disilicate-glass-ceramics-to-resin-composites
#8
Qian Hailan, Ren Lingyan, Nie Rongrong, Meng Xiangfeng
OBJECTIVE: This study aimed at determining the influence of hydrofluoric acid (HF) in varied concentrations on the surface morphology of lithium disilicate glass ceramics and bond durability between resin composites and post-treated lithium disilicate glass ceramics. METHODS: After being sintered, ground, and washed, 72 as-prepared specimens of lithium disilicate glass ceramics with dimensions of 11 mm×13 mm×2 mm were randomly divided into three groups. Each group was treated with acid solution [32% phosphoric acid (PA) or 4% or 9...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29332839/magnetic-solid-phase-extraction-based-on-magnetic-multiwalled-carbon-nanotubes-for-the-simultaneous-enantiomeric-analysis-of-five-%C3%AE-blockers-in-the-environmental-samples-by-chiral-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#9
Zhaokun Wang, Xue Zhang, Shenmeng Jiang, Xingjie Guo
In this work, the magnetic multiwalled carbon nanotubes (Mag-MWCNTs) were prepared by self-assembly method and characterized by scanning electron microscopy, X-ray powder diffraction, energy dispersive X-ray and vibrating sample magnetometer. Then, these synthetic Mag-MWCNTs were used as sorbents to extract five β-blockers (atenolol, metoprolol, esmolol, pindolol and arotinolol) by magnetic solid-phase extraction. The target analytes adsorbed on Mag-MWCNTs were eluted and determined on a chiral α-acid glycoprotein column coupled with a triple quadrupole mass spectrometry...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29327003/carbon-dots-as-absorbance-promoter-probes-for-detection-of-cu-ii-ions-in-aqueous-solution-central-composite-design-approach
#10
S A R Shahamirifard, M Ghaedi, M Montazerozohori, A Masoudiasl
In this work, the use of carbon dots (CDs) as a complexing agent and sensitizer in a polymeric matrix for determination of copper(ii) by UV-vis spectroscopy is reported for the first time. A new and highly selective Schiff base, namely, (N',N'''E,N',N'''E)-N',N'''-((((2-hydroxypropane-1,3-diyl)bis(oxy))bis(2,1-phenylene))bis(methan-ylylidene))di(isonicotinohydrazide) (NHBMDI), was also incorporated in the polymeric matrix. For the first time, the membrane composition of the proposed optical sensor including NHBMDI as the ionophore, tetraphenylborate (NaTPB) as the anionic additive, dibutyl phthalate (DBP) as the plasticizer and polyvinyl chloride (PVC) as the immobilizer was optimized through central composite design combined with the desirability function approach (DFA) because this method saves material and time consumption and is therefore cost effective...
January 12, 2018: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/29320722/biodegradation-and-ecotoxicological-impact-of-celluose-nanocomposites-in-municipal-solid-waste-composting
#11
Shoboo Salehpour, Mehdi Jonoobi, Masoud Ahmadzadeh, Valentina Siracusa, Fatemeh Rafieian, Kristiina Oksman
Biodegradable nanocomposites were prepared from polyvinyl alcohol (PVA) and cellulose nanofiber (CNF) by using liquid nitrogen, freeze drying and hot press techniques. The effect of CNF content on the biodegradability of the films was investigated by visual observation, scanning electron microscopy (SEM), weight loss, CO2 evolution, differential scanning calorimetry, measuring the amount of mineralized carbon of the specimens buried in municipal solid waste. Ecotoxicity was evaluated by plants growth tests with cress and spinach...
January 7, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29318313/preparation-and-characterization-of-chromium-doped-ni-cu-zn-nano-ferrites
#12
Bajarang Laxman Shinde, Laxman Appa Dhale, Venkat S Suryavanshi, Kishan Shankarrao Lohar
Chromium doped Ni-Cu-Zn nano ferrites with chemical formula Ni0.2Cu0.2Zn0.6Fe2-xCrxO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) were prepared by using sol-gel auto combustion method. The prepared precursors of Chromium substituted Ni-Cu-Zn ferrites were sintered at 500 °C for 4h. Compositional stoichiometry were confirmed from EDAX patterns. The XRD data revealed that the all samples possess a single phase cubic spinel structure. The Lattice constant, X-ray density, hopping lengths and crystallite size determined from XRD data decreases with increase in Cr3+ concentration...
December 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/29318291/magnetically-recyclable-fe3o4-go-nh2-h3pmo12o40-nanocomposite-synthesis-characterization-and-application-in-selective-adsorption-of-cationic-dyes-from-water
#13
Saeed Farhadi, Mohammad Hakimi, Mansoureh Maleki
In this study, the PMo12O403- polyanion was immobilized chemically on amino functionalized magnetic graphene oxide nanosheets. The as-prepared ternary magnetic nanocomposite (Fe3O4/GO-NH2/H3PMo12O40) was characterized by powder X-ray powder diffraction (XRD), fourier transformation infrared spectroscopy (FTIR), Raman spectroscopy, energy dispersive spectroscopy (EDX), field emission scanning electron microscopy (FESEM), BET surface area measurements, magnetic measurements (VSM) and atomic force microscopy (AFM)...
December 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/29316667/uv-vis-induced-degradation-of-phenol-over-magnetic-photocatalysts-modified-with-pt-pd-cu-and-au-nanoparticles
#14
Izabela Wysocka, Ewa Kowalska, Konrad Trzciński, Marcin Łapiński, Grzegorz Nowaczyk, Anna Zielińska-Jurek
The combination of TiO₂ photocatalyst and magnetic oxide nanoparticles enhances the separation and recoverable properties of nanosized TiO₂ photocatalyst. Metal-modified (Me = Pd, Au, Pt, Cu) TiO₂/SiO₂@Fe₃O₄ nanocomposites were prepared by an ultrasonic-assisted sol-gel method. All prepared samples were characterized by X-ray powder diffraction (XRD) analysis, Brunauer-Emmett-Teller (BET) method, X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), Mott-Schottky analysis and photoluminescence spectroscopy (PL)...
January 7, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29316234/extraction-and-identification-of-matrine-type-alkaloids-from-sophora-moorcroftiana-using-double-templated-molecularly-imprinted-polymers-with-hplc-ms-ms
#15
Xingbin Ma, Hongling Lin, Jiyu Zhang, Yongxin She, Xuzheng Zhou, Xiaozhong Li, Yan Cui, Jing Wang, Tsdan Rabah, Yong Shao
Double-templated molecularly imprinted polymers with specific recognition of three matrine-type alkaloids were prepared using matrine and oxymatrine as the template molecules. An approach based on double-templated molecularly imprinted solid-phase extraction coupled with high performance liquid chromatography and tandem mass spectrometry was then developed to extract and purify matrine, oxymatrine, and sophocarpine from Sophora moorcroftiana in the Tibetan plateau herbs. The polymers were characterized by FTIR spectroscopy and scanning electron microscopy...
January 5, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29315610/magnetic-dispersive-solid-phase-extraction-based-on-graphene-oxide-fe3-o4-polythionine-nanocomposite-followed-by-atomic-absorption-spectrometry-for-zinc-monitoring-in-water-flour-celery-and-egg
#16
Azar Babaei, Mohsen Zeeb, Ali Es-Haghi
BACKGROUND: Magnetic graphene oxide nanocomposite has been proposed as promising and sustainable sorbent for the extraction and separation of target analytes from food matrices. Sample preparation based on nanocomposite presents several advantages such as desired efficiency, reasonable selectivity and high surface area-to-volume ratio. RESULTS: A new graphene oxide/Fe3 O4 @polythionine (GO/Fe3 O4 @PTh) nanocomposite sorbent was introduced for magnetic dispersive solid-phase extraction (MDSPE) and flame atomic absorption spectrometric (FAAS) detection of zinc (II) in water, flour, celery and egg...
January 9, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29310293/preparation-of-magnetic-mesoporous-poly-melamine-formaldehyde-composite-for-efficient-extraction-of-chlorophenols
#17
Xiaolan Wang, Juntao Wang, Caina Jiao, Lin Hao, Qiuhua Wu, Chun Wang, Zhi Wang
A magnetic mesoporous poly-melamine-formaldehyde composite (M-mPMF) was synthesized by covalent grafting of poly-melamine-formaldehyde onto NH2-Fe3O4 surface. The M-mPMF was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and nitrogen adsorption-desorption isotherms. The result shows that the M-mPMF possesses a high porosity, large surface area and strong magnetism. The extraction performance of the M-mPMF was investigated by using it as the magnetic adsorbent for the extraction of chlorophenols from pond water and honey samples prior to high performance liquid chromatographic analysis...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29302995/preparation-of-curcumin-self-micelle-solid-dispersion-with-enhanced-bioavailability-and-cytotoxic-activity-by-mechanochemistry
#18
Qihong Zhang, Nikolay E Polyakov, Yulia S Chistyachenko, Mikhail V Khvostov, Tatjana S Frolova, Tatjana G Tolstikova, Alexandr V Dushkin, Weike Su
An amorphous solid dispersion (SD) of curcumin (Cur) with disodium glycyrrhizin (Na2GA) was prepared by mechanical ball milling. Curcumin loaded micelles were self-formed by Na2GA when SD dissolved in water. The physical properties of Cur SD in solid state were characterized by differential scanning calorimetry, X-ray diffraction studies, and scanning electron microscope. The characteristics of the sample solutions were analyzed by reverse phase HPLC, UV-visible spectroscopy, 1H NMR spectroscopy, gel permeation LC, and transmission electron microscopy...
November 2018: Drug Delivery
https://www.readbyqxmd.com/read/29286364/techniques-for-investigating-the-anatomy-of-the-ant-visual-system
#19
Fiorella Ramirez-Esquivel, Willi A Ribi, Ajay Narendra
This article outlines a suite of techniques in light microscopy (LM) and electron microscopy (EM) which can be used to study the internal and external eye anatomy of insects. These include traditional histological techniques optimized for work on ant eyes and adapted to work in concert with other techniques such as transmission electron microscopy (TEM) and scanning electron microscopy (SEM). These techniques, although vastly useful, can be difficult for the novice microscopist, so great emphasis has been placed in this article on troubleshooting and optimization for different specimens...
November 27, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29283108/electrochemical-synthesis-of-self-organized-tio2-crystalline-nanotubes-without-annealing
#20
Leonardo Giorgi, Theodoros Dikonimos, Rossella Giorgi, Francesco Buonocore, Giuliana Faggio, Giacomo Messina, Nicola Lisi
The present work demonstrates that, upon anodic polarization in a aqueous fluoride-containing electrolyte, TiO2 nanotube array films can be formed with a well-defined crystalline phase, rather than an amorphous one. The crystalline phase was obtained avoiding any high temperature annealing. We studied of the nanotubes formation in HF/H2O medium and the development of crystalline grains on the nanotube wall and we found a facile way to achieve crystalline TiO2 nanotube arrays through one-step anodization. The film crystallinity resulted to be influenced by the synthesis parameters and the optimization of the electrolyte composition and anodization conditions (applied voltage and time) has been carried out...
December 28, 2017: Nanotechnology
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