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Sample preparation for scanning electron microscopy

Jun Tao, Peili Huo, Zongheng Fu, Jin Zhang, Zhen Yang, Dengfeng Zhang
The preparation of activated carbon (AC) using tea residue as precursor was fully addressed in this work. The preparation process mainly incorporated two-step pyrolysis and activation using NaOH. The influence of activation temperature ranging between 500 and 700 (o)C on the properties of the obtained AC sample was investigated. The physicochemical properties of the prepared AC sample were characterized using N2 adsorption/desorption, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS)...
September 22, 2017: Environmental Technology
Francis D Krampa, Yaw Aniweh, Gordon A Awandare, Prosper Kanyong
A conducting polymer-based composite material of poly(3,4-ethylenedioxythiophene) (PEDOT): poly(4-styrenesulfonate) (PSS) doped with different percentages of a room temperature ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF₄]), was prepared and a very small amount of the composite (2.0 µL) was drop-coated on the working area of a screen-printed carbon electrode (SPCE). The SPCE, modified with PEDOT:PSS/IL composite thin-film, was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), profilometry and sessile contact angle measurements...
July 26, 2017: Sensors
Yanqiu Zhang, Baojiu Chen, Sai Xu, Xiangping Li, Jinsu Zhang, Jiashi Sun, Hui Zheng, Lili Tong, Guozhu Sui, Hua Zhong, Haiping Xia, Ruinian Hua
To realize photothermal therapy (PTT) of cancer/tumor both the photothermal conversion and temperature detection are required. Usually, the temperature detection in PTT needs complicated instruments, and the therapy process is out of temperature control in the present investigations. In this work, we attempt to develop a novel material for achieving both the photothermal conversion and temperature sensing and control at the same time. To this end, a core-shell structure with NaYF4:Er(3+)/Yb(3+) core for temperature detection and NaYF4:Tm(3+)/Yb(3+) shell for photothermal conversion was designed and prepared...
September 19, 2017: Scientific Reports
Hideo Kawabata, Kazushige Isobe, Taisuke Watanabe, Toshimitsu Okudera, Masayuki Nakamura, Masashi Suzuki, Jietsu Ryu, Yutaka Kitamura, Hajime Okudera, Kazuhiro Okuda, Koh Nakata, Tomoyuki Kawase
The platelet-rich fibrin-like matrix (PRFM) is usually prepared onsite and immediately used for regenerative therapy. Nonetheless, to meet the clinical necessity of preserving the PRFM without quality deterioration, we developed a method for preparation of PRFMs from short-term-stored whole blood (WB) samples. In this study, to evaluate the practical expiration date of storage, we extended the storage time of WB samples from 2 to 7 days and assessed the quality of the resulting PRFMs. WB samples collected with acid-citrate-dextrose were stored with gentle agitation at ambient temperature...
September 18, 2017: Biomedicines
Tamás Gábor Weiszburg, Katalin Gherdán, Kitti Ratter, Norbert Zajzon, Zsolt Bendő, György Z Radnoczi, Ágnes Takács, Tamás Váczi, Gábor Varga, György Szakmány
Although gilt silver threads were widely used for decorating historical textiles, their manufacturing techniques have been elusive for centuries. Contemporary written sources give only limited, sometimes ambiguous information, and detailed cross-sectional study of the microscale soft noble metal objects has been hindered by sample preparation. In this work, to give a thorough characterization of historical gilt silver threads, nano- and microscale textural, chemical and structural data on cross sections, prepared by focused ion beam milling, were collected, using various electron-optical methods (high-resolution scanning electron microscopy (SEM), wavelength-dispersive electron probe microanalysis (EPMA), electron back-scattered diffraction (EBSD) combined with energy-dispersive electron probe microanalysis (EDX), transmission electron microscopy (TEM) combined with EDX, and micro-Raman spectroscopy...
September 19, 2017: Analytical Chemistry
Fayaz Ali, Sher Bahadar Khan, Tahseen Kamal, Yasir Anwar, Khalid A Alamry, Abdullah M Asiri
Nanoparticles were synthesized on the surface of green nanocomposite based on carbon black dispersed in chitosan (CB-CS) fibres. The nanoparticles were monometallic Co, Ag and Cu and bimetallic Co + Cu and Co + Ag. The CB-CS fibres were prepared and introduced into separate metal salt solutions containing Co(2+), Ag(+) and Cu(2+) and mixed Co(2+)+Cu(2+) and Co(2+)+Ag(+) ions. The metal ions immobilized on the surface of CB-CS were reduced using sodium borohydride (NaBH4) as reducing agent to synthesize the corresponding zero-valent metal nanoparticles-loaded CB-CS fibres...
August 28, 2017: Chemosphere
Zahra Bahrololoomi, Azam Dadkhah, Mohammadsadegh Alemrajabi
Introduction: The aim of this study was to evaluate the effect of various concentrations of NaOCl on shear bond strength of composite resin to dentin of primary teeth, prepared with laser and bur. Methods: In this in vitro study, 48 primary molars were sectioned at mesiodistal direction and were randomly divided into 6 groups; G1: bur, G2: bur + NaOCl 2.5%, G3: bur + NaOCl 5.25%, G4: laser, G5: laser + NaOCl 2.5%, G6: laser + NaOCl 5.25%. One-Step Plus adhesive was applied after phosphoric acid gel and NaOCl over the dentin surfaces for all groups, and composite resin cylinders were bonded to the samples...
2017: Journal of Lasers in Medical Sciences
Petra Fiala, Daniel Göhler, Benno Wessely, Michael Stintz, Giovanni Mattia Lazzerini, Andrew Yacoot
Dimensional measurements on nano-objects by atomic force microscopy (AFM) require samples of safely fixed and well individualized particles with a suitable surface-specific particle number on flat and clean substrates. Several known and proven particle preparation methods, i.e., membrane filtration, drying, rinsing, dip coating as well as electrostatic and thermal precipitation, were performed by means of scanning electron microscopy to examine their suitability for preparing samples for dimensional AFM measurements...
2017: Beilstein Journal of Nanotechnology
Juanjuan Wu, Ruiyang Ma, Lin Hao, Chun Wang, Qiuhua Wu, Zhi Wang
A hypercrosslinked organic polymer material (named as PPTPA) was prepared by a simple one-step self-polycondensation of triphenylamine. A series of characterization experiments, including N2 adsorption, scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectra, and thermogravimetric analysis, were carried out to evaluate the morphology, structure and other intrinsic properties of the PPTPA. To investigate its adsorption performance, the PPTPA was used as the solid-phase extraction adsorbent for the extraction of phenylurea herbicides from water, milk and tomato juice samples followed by high-performance liquid chromatographic analysis...
September 6, 2017: Journal of Chromatography. A
F Boorboor Ajdari, E Kowsari, A Ehsani
In the present work, zeolitic imidazolate framework (ZIF-67) was synthesized via chemical routes. For improving the electrochemical performance of the conductive polymer, POAP/ /ZIF-67 composite films were fabricated by POAP electropolymerization in the presence of ZIF-67 as active electrodes for electrochemical supercapacitors. The structural and the valance states of the prepared samples were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Different electrochemical methods, including galvanostatic charge discharge experiments, cyclic voltammetry, and electrochemical impedance spectroscopy, have been applied to study the system performance...
September 1, 2017: Journal of Colloid and Interface Science
Subbiramaniyan Kubendhiran, Balamurugan Thirumalraj, Shen-Ming Chen, Chelladurai Karuppiah
In this work, we describe a simple approach for the preparation of cobalt sulfide/reduced graphene oxide (CoS/RGO) nanohybrids via single step electrochemical method. The electrocatalytic activity of the CoS/RGO nanohybrids was evaluated towards the detection hydrogen peroxide (H2O2). The physiochemical properties of the prepared composite was characterized by means of field emission scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and X-ray powder diffraction patterns...
August 30, 2017: Journal of Colloid and Interface Science
Paolo Tempesti, Giovanni Simone Nicotera, Massimo Bonini, Emiliano Fratini, Piero Baglioni
HYPOTHESIS: Dental decay, asa consequence of exposure to acidic foods and drinks, represents one of the most important tooth pathologies. Recently, enamel and dentinal surface remineralization using hydroxyapatite nano- and microparticles has been proposed; however, commercial remineralizing toothpastes are quite expensive, mostly due to the high costs of hydroxyapatite. Hence, we propose a thermoresponsive hybrid nanocomposite material as filler for tooth defects. The use of thermoresponsive composite particles aims at filling exposed dentinal tubules in response to a change of temperature in the oral cavity...
September 9, 2017: Journal of Colloid and Interface Science
Xiaojing Liang, Licheng Wang, Shuai Wang, Yijing Li, Yong Guo
Packed cartridges have been widely used in solid-phase extraction. However, there are still some drawbacks, such as they are blocked easily and the method is time-consuming. In view of the advantages of monoliths, a monolithic extraction material has been directly synthesized in a glass syringe without any gap between the monolith and syringe's inner wall. The monolithic syringe was modified with graphene oxide by loading a graphene oxide dispersion onto it. The content of graphene oxide and the surface topography of the monolith have been evaluated by elemental analysis and scanning electron microscopy, respectively, which confirmed the successful modification...
September 12, 2017: Journal of Separation Science
Jiangbo Xi, Juan Zhang, Haiyan Zhao
A novel magnetic absorbent based on Fe3O4 hollow nanospheres was developed for polycyclic aromatic hydrocarbons (PAHs) extraction. Fe3O4 hollow nanospheres were prepared by a one-pot facile solvothermal method and its structural properties were characterized by scanning electron microscope (SEM) and analyzer transmission electron microscopy (TEM). It was the first time to use hollow nanospheres which possess high special surface area for magnetic solid-phase extraction (MSPE). The extraction condition of Fe3O4 hollow nanospheres and its performance for PAHs was systematically investigated...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
M Sikora-Jasinska, C Paternoster, E Mostaed, R Tolouei, R Casati, M Vedani, D Mantovani
Recently, Fe and Fe-based alloys have shown their potential as degradable materials for biomedical applications. Nevertheless, the slow corrosion rate limits their performance in certain situations. The shift to iron matrix composites represents a possible approach, not only to improve the mechanical properties, but also to accelerate and tune the corrosion rate in a physiological environment. In this work, Fe-based composites reinforced by Mg2Si particles were proposed. The initial powders were prepared by different combinations of mixing and milling processes, and finally consolidated by hot rolling...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Majid Arvand, Masoomeh Sayyar Ardaki
A new nanocomposite film constructed of poly-l-cysteine/zinc oxide nanoparticles-electrospun copper oxide nanofibers (PLC/ZnO-NPs-CuO-NFs) was prepared on the surface of the graphite electrode (GE). The novel electrode was successfully applied for the simultaneous determination of guanine (G) and adenine (A), two of the most important components of DNA and RNA. The PLC/ZnO-NPs-CuO-NFs/GE enhanced the anodic peak currents of the purine bases conspicuously and could determine them sensitively and separately in 0...
September 15, 2017: Analytica Chimica Acta
Rui M Almeida, Tiago Ribeiro, Luís F Santos
A ytterbium doped active material for thin-disk laser was developed based on aluminosilicate and phosphosilicate glass matrices containing up to 30 mol% YbO1.5. Thick films and bulk samples were prepared by sol-gel processing. The structural nature of the base material was assessed by X-ray diffraction and Raman spectroscopy and the film morphology was evidenced by scanning electron microscopy. The photoluminescence (PL) properties of different compositions, including emission spectra and lifetimes, were also studied...
September 2, 2017: Materials
Clara Correa-Soto, Niraj S Trasi, Paul D Schmitt, Yongchao Su, Zhen Liu, Elise Miller, Narayan Variankaval, Patrick J Marsac, Garth J Simpson, Lynne S Taylor
Various techniques have been used to detect crystallization in amorphous solid dispersions (ASD). However, most of these techniques do not enable the detection of very low levels of crystallinity (<1%). The aim of the current study was to compare the sensitivity of second harmonic generation (SHG) microscopy with powder X-ray diffraction (XRPD) in detecting the presence of crystals in low drug loading amorphous solid dispersions. Amorphous solid dispersions of the poorly water soluble compounds, flutamide (FTM, 15wt...
August 24, 2017: Journal of Pharmaceutical and Biomedical Analysis
Ali Taha, Muhammad Akram, Zaidoon Jawad, Ammar Z Alshemary, Rafaqat Hussain
Microwave assisted wet precipitation method was used to synthesize calcium deficient strontium doped β-tricalcium phosphate (Sr-βTCP) with a chemical formula of Ca2.96-xSrx(PO4)2. Sr-βTCP was reacted with monocalcium phosphate monohydrate [Ca(H2PO4)2.H2O, MCPM] in presence of water to furnish corresponding Sr containing brushite cement (Sr-Brc). The samples were characterized by using X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM)...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Ali Fakhri, Shiva Tahami, Pedram Afshar Nejad
The Best performance drug delivery systems designed with Fe3O4-Ag2O quantum dots decorated cellulose nanofibers which that grafted with Etoposide and Methotrexate. Morphology properties were characterized by Scanning and Transmittance electron microscopy. The crystalline structure of prepared sample was evaluated using by X-ray diffraction. The vibrating sample magnetometer analysis was used for magnetic behavior of samples. The size distributions of Fe3O4-Ag2O QDs/Cellulose fibers nanocomposites indicate that the average diameter was 62...
August 24, 2017: Journal of Photochemistry and Photobiology. B, Biology
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