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Sample preparation for scanning electron microscopy

Azam Jangju, Khalil Farhadi, Mehdi Hatami, Samireh Amani, Farzan Esmali, Aisan Moshkabadi, Fatemeh Hajilari
A simple method for the simultaneous and trace analysis of four synthetic food azo dyes including carmoisine, ponceau 4R, sunset yellow and allura red from some foodstuff samples was developed by combining dispersive μ-solid-phase extraction and high-performance liquid chromatography with diode array detection. Zein-modified magnetic Fe3 O4 nanoparticles were prepared and used for μ-solid-phase extraction of trace amounts of mentioned food dyes. The prepared modified magnetic nanoparticles were characterized by scanning electron microscopy and FTIR spectroscopy...
January 18, 2017: Journal of Separation Science
Behrouz Akbari-Adergani, Gholam-Hossein Sadeghian, Alireza Alimohammadi, Zahra Esfandiari
In this study, a new separation technique based on membrane extraction is described for the determination of melamine in dry milk. The water-compatible cellulose acetate membrane, which is photo-grafted by melamine imprinted nanospheres, was prepared by placing the membrane into the polymerization solution containing methacrylic acid as functional monomer, ethylene glycol dimethacrylate as cross-linker, acetonitrile as porogen and melamine as the template molecule. The characterization of the polymeric membrane was performed by Fourier transmission infrared spectroscopy and scanning electron microscopy...
January 18, 2017: Journal of Separation Science
Vida Jodaian, Akram Shahrjerdi, Pari Mirahmadpour
A new zinc complex, [Zn(mq)2], (mq = 2-methyl-8-hydroxyquinoline) was prepared via an electrochemical route from the oxidation of zinc metal in the presence of 2-methyl-8-hydroxyquinoline in a fast and facile process. The complex was fully characterized by means of NMR and IR spectra and elemental analysis. The nanostructure of the prepared compound was obtained by sonoelectrochemical process and studied by scanning electron microscopy, X-ray powder diffraction, IR spectroscopy and elemental analysis. Thermal stability of crystalline bulk and nano-size samples of the prepared compound was studied by thermal gravimetric and differential thermal analysis...
January 17, 2017: Journal of Fluorescence
Morteza Sasani Ghamsari, Sanaz Alamdari, Wooje Han, Hyung-Ho Park
Nanoscale ZnO is one of the best choices for ultraviolet (UV) protection, not only because of its antimicrobial properties but also due to its potential application for UV preservation. However, the behavior of nanostructured thin ZnO films and long-term effects of UV-radiation exposure have not been studied yet. In this study, we investigated the UV-protection ability of sol gel-derived thin ZnO films after different exposure times. Scanning electron microscopy, atomic force microscopy, and UV-visible optical spectroscopy were carried out to study the structure and optical properties of the ZnO films as a function of the UV-irradiation time...
2017: International Journal of Nanomedicine
Dongqin Tan, Jing Jin, Fang Li, Xiaoli Sun, Dhanjai, Yuwen Ni, Jiping Chen
Magnesium oxide microspheres functionalized with phenyltrichlorosilane (PTS-MgO) were synthesized by surface modification through silanization reaction, which was confirmed by Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetry analysis (TGA) and N2 adsorption-desorption. The result indicated that PTS-MgO not only possessed the ability of enhancing the retention with PAHs, but also weakening the interference from chlorinated compounds. As a sorbent for the matrix solid-phase dispersion (MSPD) extraction, PTS-MgO was used to selectively extract seven dioxin-like polycyclic aromatic hydrocarbons (DL-PAHs) from soil samples...
March 1, 2017: Analytica Chimica Acta
Sarah C Motshekga, Suprakas Sinha Ray
Disinfection of bacterially-contaminated drinking water requires a robust and effective technique and can be achieved by using an appropriate disinfectant material. The advanced use of nanomaterials is observed as an alternative and effective way for the disinfection process and water treatment as a whole. Hence, the inactivation of Escherichia coli (E. coli) using chitosan-Bentonite (Cts-Bent) composites was studied in a fixed bed column. Cts-Bent composites were synthesized using in situ cross-linking method using Bent-supported silver and zinc oxide nanoparticles...
January 3, 2017: Water Research
Hamdy Ibrahim, Andrew D Klarner, Behrang Poorganji, David Dean, Alan A Luo, Mohammad Elahinia
Mg-Zn-Ca alloys have grabbed most of the recent attention in research attempting to develop an Mg alloy for bone fixation devices due to their superior biocompatibility. However, early resorption and insufficient strength remain the main problems that hinder their use. Heat treatment has previously been thoroughly studied as a post-shaping process, especially after the fabrication of complex parts (e.g. porous structures) by 3D-printing or powder metallurgy. In this work, the effect of heat treatment on Mg-1...
January 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Sergii G Nedilko, Sergiy Revo, Vitalii Chornii, Vasyl Scherbatskyi, Kateryna Ivanenko, Maksym Nedielko, Yurii Sementsov, Mykola Skoryk, Andrii Nikolenko, Victor Strelchuk
Micro/nanosized carbon materials were prepared by electrochemical exfoliation method in the forms of the colloids and thin films. Scanning electronic microscopy, optical and luminescent microscopy, and Raman scattering and luminescent spectroscopy were applied for characterization of materials. The wide photoluminescence band in the visible spectral region was observed for each of the samples. The shape of the photoluminescence band depends on excitation wavelength and on the size of the particles. At least two components with maxima at ~580 and ~710 nm can be distinguished in the photoluminescence spectra...
December 2017: Nanoscale Research Letters
Borja Rodríguez-Cabo, Iago Rodríguez-Palmeiro, Raquel Corchero, Rosario Rodil, Eva Rodil, Alberto Arce, Ana Soto
The photocatalytic degradation of wastewater containing three industrial dyes belonging to different families, methyl orange (MO), methylene blue (MB) and Rhodamine B (RhB), was studied under UV-Vis irradiation using synthesised silver chloride nanoparticles. The nanocatalyst was prepared by a dissolution/reprecipitation method starting from the bulk powder and the ionic liquid trihexyl(tetradecyl)phosphonium chloride, [P6 6 6 14]Cl, without addition of other solvents. The obtained catalyst was characterised by UV-Vis absorbance, X-ray powder diffraction, transmission electron microscopy and scanning electron microscopy...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Caroline Saucier, P Karthickeyan, V Ranjithkumar, Eder C Lima, Glaydson S Dos Reis, Irineu A S de Brum
Activated carbon (AC)/CoFe2O4 nanocomposites, MAC-1 and MAC-2, were prepared by a simple pyrolytic method using a mixture of iron(III)/cobalt(II) benzoates and iron(III)/cobalt(II) oxalates, respectively, and were used as efficient adsorbents for the removal of amoxicillin (AMX) and paracetamol (PCT) of aqueous effluents. The synthesized nanocomposites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM)...
January 7, 2017: Environmental Science and Pollution Research International
Amirhassan Amiri, Hamid Reza Saadati-Moshtaghin, Farokhzad Mohammadi Zonoz, Azadeh Targhoo
In this work, aminopropyl modified silica-coated magnetite nanoparticles with Wells-Dawson heteropoly acid (P2W17Fe@APSCMNPs) was first synthesized and underwent highly efficient magnetic solid-phase extraction (MSPE) of aromatic amines from aqueous samples. The resulted nanomaterials were characterized with different physicochemical techniques such as Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM). Aniline, N,N-dimethylaniline, o-toluidine and 3-chloroaniline were selected as target compounds...
December 31, 2016: Journal of Chromatography. A
Erum Nosheen, Syed Mujtaba Shah, Zafar Iqbal
This article provides a facile one step synthesis of CdS (cadmium sulphide) and CdS/rGO (reduced graphene oxide CdS nanocomposites) using DMF (N, N-Dimethyl formamide) both as a solvent and a reducing agent for the reduction of grapheme oxide. XRD (X-ray diffraction), FESEM (Field emission scanning electron microscopy), EDX (Elemental dispersive X-ray analysis), TEM (Transmission electron microscopy), UV-Vis (UV-visible) and Raman spectroscopy have been employed for the characterization of prepared samples...
December 30, 2016: Journal of Photochemistry and Photobiology. B, Biology
Licheng Wang, Wei Fan, Shuman Li, Yong Jia, Xiudan Hou, Xusheng Wang, Shuai Wang, Yong Guo
As a novel solid-phase extraction material, zinc sulfide nanosheets were prepared by a simple method and were used to extract flavonoids. We used scanning electron microscopy to show its nanosheet morphology and energy dispersive X-ray spectroscopy and powder X-ray diffraction to confirm its chemical and phase compositions. Coupled to a high-performance liquid chromatography, the zinc sulfide nanosheets were packed into a micro-column and were used to extract four model flavonoids to examine its extraction ability...
January 6, 2017: Journal of Separation Science
Ningning Chen, Juan He, Chaojun Wu, Yuanyuan Li, An Suo, Hongliang Wei, Lijun He, Shusheng Zhang
Novel molecularly imprinted polymers of phthalate esters were prepared by atom transfer radical polymerization using methyl methacrylate as functional monomer, cyclohexanone as solvent, cuprous chloride as catalyst, 1-chlorine-1-ethyl benzene as initiator and 2,2-bipyridyl as cross-linker in the mixture of methanol and water (1:1, v/v). The effect of reaction conditions such as monomer ratio and template on the adsorption properties was investigated. The optimum condition was obtained by an orthogonal experiment...
January 6, 2017: Journal of Separation Science
Mansour Issaoui, Lionel Limousy, Bénédicte Lebeau, Jamel Bouaziz, Mohieddine Fourati
Low-cost tubular macroporous supports for ceramic membranes were elaborated using the extrusion method, followed by curing, debinding, and sintering processes, from a powder mixture containing kaolin, starch, and sand. The obtained substrates were characterized using mercury intrusion porosimetry, water absorption test, water permeability, scanning electron microscopy, and three-point bending test to evaluate the effects of the additives on the relevant characteristics. According to experimental results, adding the starch ratio to the kaolin powder shows a notable impact on the membrane porosity and consequently on the water permeability of the tubular supports, whereas their mechanical strength decreased compared to those prepared from kaolin alone...
January 5, 2017: Environmental Science and Pollution Research International
Marwa Abdel Hafez, Mona Elkateb, Sonia El Shabrawy, Amel Mahmoud, Omar El Meligy
AIM: To evaluate the microleakage of composite restorations following Papain-based chemo-mechanical caries removal compared to the conventional drilling method. The characteristic of the hybrid layer was also studied using scanning electron microscopy. STUDY DESIGN: The sample included thirty freshly extracted and exfoliated primary molars with open proximal carious dentin lesions. Teeth were divided into two equal groups, according to method of caries removal. Following caries removal, cavity preparations were restored with composite resin...
2017: Journal of Clinical Pediatric Dentistry
J Richard McIntosh, Mary K Morphew, Thomas H Giddings
Electron microscopy (EM) can provide images of cells with a spatial resolution that significantly surpasses that available from light microscopy (LM), even with modern methods that give LM "super resolution." However, EM resolution comes with costs in time spent with sample preparation, expense of instrumentation, and concerns regarding sample preparation artifacts. It is therefore important to know the limitations of EM as well as its strengths. Here we describe the most reliable methods for the preservation of fission yeast cells currently available...
January 3, 2017: Cold Spring Harbor Protocols
Manoochehr Farjaminezhad, Mohammad Saber Tehrani, Parviz Aberoomand Azar, Shahab Bohlooli, Syed Waqif Hussain
A high-performance metal oxide-polymer magnetite/polyethylene glycol nanocomposite was prepared and coated in situ on the surface of the optical fiber by sol-gel technology. The magnetite nanoparticles as nanofillers were synthesized by co-precipitation method and bonded with polyethylene glycol as polymer. The chemically bonded coating was evaluated for the headspace-solid phase microextraction of some environmentally important volatile organic compounds, from aqueous samples in combination with gas chromatography and mass spectrometry...
January 2, 2017: Journal of Separation Science
Bruno R Araújo, Luciane P C Romão, Marta E Doumer, Antonio S Mangrich
The aim of this study was to evaluate the interactions of peat, humic acids, and humin with urea dispersed in chitosan, in systems intended for the controlled release of urea. Spheres of chitosan with humic material and urea intentionally added to the media were prepared and characterized by means of elemental analysis (CHN), electron paramagnetic resonance (EPR), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The spheres possessed functional groups related to humic substances that interacted with the chitosan, and the presence of urea in the media was also confirmed after it has been added...
December 29, 2016: Journal of Environmental Management
Sirwan Mohammadiazar, Fatemeh Hasanli, Mehdi Maham, Somayeh Payami Samarin
Electrochemically co-deposited sol-gel/Cu nanocomposites has been introduced as a novel, simple and single step technique for preparation of solid phase microextraction coating to extract methadone (MDN) (a synthetic opioid) in urine samples. The porous surface structure of the sol-gel/Cu nanocomposite coating was revealed by scanning electron microscopy (SEM). Direct immersion-solid phase microextraction (DI-SPME) followed by HPLC-UV determination was employed. The factors influencing the SPME procedure such as the salt content, desorption solvent type, pH and equilibration time were optimized...
December 30, 2016: Biomedical Chromatography: BMC
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