Synthesis and Characterization of Surface-Grafted Magnesium Oxide Whiskers with poly(L-lactide)

2013 ◽  
Vol 820 ◽  
pp. 41-44
Author(s):  
Wei Wen ◽  
Bing Hong Luo ◽  
Cai Rong Li ◽  
Wan Xu ◽  
Chang Ren Zhou
Keyword(s):  
Electron Microscope ◽  
Magnesium Oxide ◽  
Solution Method ◽  
Magnesium Carbonate ◽  
X Ray Diffraction ◽  
Vibration Absorption ◽  
Transmission Electron ◽  
Stretching Vibration ◽  
Vibration Absorption Peak

Firstly, Magnesium oxide (MgO) whiskers were prepared by calcination of magnesium carbonate (MgCO3)whiskers which were obtained by solution method. Then, surface-grafted MgO whiskers with poly (L-lactide) were synthesized by bulk ring-opening polymerization ofL-lactide onto the surface of MgO whiskers. The MgO whiskers and surface-grafted MgO whiskers were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), x-ray diffraction (XRD) and fourier transformation infrared (FTIR). Results showed that MgO whiskers diameter in the range of 0.02-0.5μm, the length is between 10-80μm and well dispersed. A new characteristic stretching vibration absorption peak of C=O apppeared in the IR spectrum of the surface-grafted MgO whiskers, which suggested that poly (L-lactide) chains were successfully grafted on the surface of MgO whiskers.

Synthesis and Characterization of Sr3MgSi2O8:Eu2+, Dy3+ Phosphor Prepared by a Chemical Solution Method

2011 ◽  
Vol 675-677 ◽  
pp. 1089-1092 ◽  
Author(s):  
Wen Pan ◽  
Ning Hui Wang ◽  
Guo Feng Li ◽  
Gui Ling Ning
Keyword(s):  
Solution Method ◽  
Intermediate Phase ◽  
Precursor Solution ◽  
X Ray Diffraction ◽  
Calcination Process ◽  
Chemical Solution Method ◽  
Transmission Electron ◽  
Dispersion Media ◽  
Better Than

A novel synthesis route for the production of Sr3MgSi2O8:Eu2+,Dy3+ sub-micron quasisphere phosphor powder is reported. Both the host and activator cations were co-precipitated in water-ethanol mixed solutions and precipitation was performed with analytical grade ammonium citratetribasic. As the dispersion media, optimum concentration for PEG in the precursor solution is determined to be 0.08 g/mL. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and fluorescence spectrophotometer were employed to characterize the phosphor. The effect of the calcining temperature on the crystalline particle and luminescence properties of Sr3MgSi2O8:Eu2+,Dy3+ is systematically discussed. Sr3MgSi2O8:Eu2+,Dy3+ single phased quasi-sphere phosphor was achieved by calcining the asprecipitated precursor at 1100°C. Sr2SiO4 was identified as the intermediate phase during the calcination process. Despite the small particle size, the emission intensities were higher by the present method. However, the afterglow characteristic was not better than that prepared by solidstate reaction in the comparable condition.

Preparation and characterization of iron oxide nanoparticles coated with chitosan for removal of Cd(II) and Cr(VI) from aqueous solution

2014 ◽  
Vol 70 (6) ◽  
pp. 1004-1010 ◽  
Author(s):  
Th. I. Shalaby ◽  
N. M. Fikrt ◽  
M. M. Mohamed ◽  
M. F. El Kady
Keyword(s):  
Electron Microscope ◽  
Magnetic Nanoparticles ◽  
Magnetic Nanomaterials ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Toxic Heavy Metals ◽  
Transmission Electron ◽  
Magnetite Fe3o4 ◽  
Co Precipitation

This study investigated the applicability of magnetite Fe3O4 nanoparticles coated with chitosan (CMNs) for the removal of some toxic heavy metals from simulated wastewater. Magnetic nanomaterials were synthesized using the co-precipitation method and characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, and Fourier transformer infrared spectroscopy. The magnetic properties of the prepared magnetic nanoparticles were determined by a vibrating-sample magnetometer. Batch experiments were carried out to determine the adsorption kinetics of Cr(VI) and Cd(II) by magnetic nanoparticles. It is noteworthy that CMNs show a highly efficient adsorption capacity for low concentration Cr(VI) and Cd(II) ions solution, which can reach 98% within 10 min.

Preparation and characterization of nano NC/HMX composite particles

2017 ◽  
Vol 24 (1) ◽  
pp. 123-128
Author(s):  
Chongwei An ◽  
Hequn Li ◽  
Binshuo Yu ◽  
Xiaoheng Geng ◽  
Jingyu Wang
Keyword(s):  
Electron Microscope ◽  
Impact Sensitivity ◽  
Composite Particles ◽  
Nano Composites ◽  
Thermal Stimulus ◽  
X Ray Diffraction ◽  
Nano Composite ◽  
Transmission Electron ◽  
Composite Samples

AbstractNano nitrocellulose/cyclotetramethylene tetranitramine (NC/HMX) composite particles were precipitated from their co-solutions by the spray drying method. The nano composite samples were characterized by scanning electron microscope, transmission electron microscope and X-ray diffraction. Impact sensitivity and thermal decomposition properties of nano composites were also measured and analyzed. Results show that the product particles are close to spherical in shape and range from 0.5 μm to 5 μm in size. In the product particles, β-HMX particles with size ranging from 50 nm to 100 nm are uniformly and discretely dispersed in NC binders. The drop height of nano NC/HMX composite particles (66.1 cm) is more than triple as high as that of raw HMX (21.6 cm), exhibiting considerably low impact sensitivity. Moreover, nano composite particles are easier to decompose and decomposed more rapidly than do raw HMX under the thermal stimulus due to the lower peak temperature and activation energy and higher reaction rate. Therefore, nano composites are expected to be candidates filled in high burning rate propellants.

Microstructural Characterization of a Fe-Based Compostie Reinforced by TiC

2011 ◽  
Vol 675-677 ◽  
pp. 835-838
Author(s):  
Jing Wang ◽  
Si Jing Fu ◽  
Hong Cheng
Keyword(s):  
Electron Microscope ◽  
Microstructural Characterization ◽  
Interfacial Structure ◽  
Synthesis Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Tic Particle ◽  
Scanning Electron

The present work reported the preparation of TiC/Fe-based composite by the synthesis reaction from Ti, C and Fe. The sintered composites were characterized by X-ray diffraction, scanning electron microscope and transmission electron microscope. TiC, Fe3C and α-Fe were detected by X-ray diffraction analysis. The scanning and transmission electron micrographs revealed the morphology and distribution of the reinforcements, the microstructure of Fe matrix, the interfacial structure of TiC particle-to-Fe matrix. Moreover, the formation reason of the voids in composite was also discussed.

Synthesis and Characterization of Lamellar Nanostructured Yttrium Films Using Lyotropic Liquid Crystalline Templates

2011 ◽  
Vol 399-401 ◽  
pp. 1915-1918
Author(s):  
Rui Jie Guo ◽  
Xiao Juan Sha ◽  
Lei Lei Cao
Keyword(s):  
Electron Microscope ◽  
Liquid Crystalline ◽  
Electroless Deposition ◽  
Electronic Materials ◽  
X Ray Diffraction ◽  
Regular Array ◽  
X Ray ◽  
Surface Areas ◽  
Transmission Electron

The lamellar nanostructured yttrium films on α-Al2O3 substrates were successfully synthesized by electroless deposition using the lyotropic liquid crystalline templating strategy. The reaction of hydrazine hydrate and Y3+ dissolved within the aqueous domains of the lyotropic liquid crystalline phase produced the nanostructured yttrium films. The low-angle X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM) indicated that the as-resulted films possessed lamellar regular array of nanochannels with periodicity of 6 nm. With well-defined nanochannels and higher surface areas, the nanostructured films may find applications in the field of electronic materials.

Synthesis and Characterization of Nano-Hexaferrites SrFe12O19 by Aqueous Solution Method

2011 ◽  
Vol 306-307 ◽  
pp. 404-409 ◽  
Author(s):  
Jian An Liu ◽  
Mei Mei Zhang ◽  
Yan Fei Zhang ◽  
Shu Jiang Liu
Keyword(s):  
Aqueous Solution ◽  
Magnetic Properties ◽  
Solution Method ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Nanometer Materials ◽  
Transmission Electron ◽  
Fast Synthesis ◽  
Aqueous Solution Method

Nano-hexaferrite SrFe12O19 has been prepared using the aqueous solution method. The structure and magnetic properties of SrFe12O19 have systematically been investigated by X-ray diffraction (XRD), Thermo gravimetric (TG), Fourier transform infrared spectroscopy (FTIR), Transmission Electron Microscopy (TEM), as well as Vibrating Sample Magnetometer (VSM). The XRD and TEM results showed that the samples are composed of SrFe12O19 nano-particles which are on average 70×50nm in dimensions when treated at 1200°C for 2 hours. The magnetic properties indicated that the saturation magnetization and the intrinsic coercivity were 48 Am2/kg and 506KA/m, respectively. The aqueous solution method is generally applicable to produce the nano-hexaferrite SrFe12O19 and is proved to be a promising method for fast synthesis of nanometer materials using nitrate.

Preparation and Characterization of Nanocomposite Ni-Al2O3 Thin Films by Ultrasonic-Electrodeposition Technology

2011 ◽  
Vol 130-134 ◽  
pp. 994-997
Author(s):  
Jin Dong Wang ◽  
Fa Feng Xia
Keyword(s):  
Thin Films ◽  
Electron Microscope ◽  
Steel Substrate ◽  
Al2o3 Nanoparticles ◽  
X Ray Diffraction ◽  
Technological Parameters ◽  
Transmission Electron ◽  
Metallurgical Structure ◽  
Al2o3 Particles

Nanocomposite Ni-Al2O3 thin film containing nanosized Al2O3 particles had been grown on steel substrate by ultrasonic-electrodeposited technology. The optimum technological parameters of nanocomposite Ni-Al2O3 thin films were obtained by experiments and analysis. X-ray diffraction analysis was utilized to detect the crystalline and amorphous characteristics of Ni-Al2O3 thin films. The surface morphology and metallurgical structure were analysed by high resolution transmission electron microscope, and scanning electron microscope. The test results showed that nanocomposite Ni-Al2O3 thin films prepared by proper ultrasonic-electrodeposited method consist of nanometer-sized Al2O3 particles and nickel grains. And the Al2O3 nanoparticles and Ni grains diameters in thin films are about 40nm and 80nm, respectively.

Synthesis and Characterization of MgPSZ-PMMA Composite by Sol-Gel Modification and Direct Foaming Technique Using Egg Whites

2016 ◽  
Vol 720 ◽  
pp. 290-295
Author(s):  
Veni Takarini ◽  
Alfend Rudyawan ◽  
Andri Hardiansyah ◽  
Rifki Septawendar ◽  
Niki Prastomo ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Crystal Size ◽  
Sol Gel ◽  
Porous Structures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Direct Foaming ◽  
Transmission Electron ◽  
Direct Foaming Method

This study prepared Magnesium-Partially Stabilized Zirconia (Mg-PSZ) filler synthesis and direct foaming technique using egg whites, and impregnated by PMMA. The results were evaluated systematically by X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and Transmission Electron Microscope (TEM). XRD results denote that the powder sample of MgPSZ was successfully formed with various crystal size of tetragonal and monoclinic phase. SEM and TEM observations revealed that nanoparticles MgPSZ were in spherical and long rounded shapes. Furthermore, SEM observation revealed that the direct foaming method were also successful in the formation of porous structures which favourable for impregnation process by PMMA. The use of egg whites as a polymer precursor in both methods demonstrates that porous specimens contained nanosized, predominantly tetragonal, Mg-PSZ powders were successfully synthesized. This shall yield an interesting prospect towards cheap, reliable, and biocompatible product to resemble the modulus elasticity of dentin.

scholarly journals Fabrication and characterization of ferrites (Mg and Mn) based on FTIR, XRD, SEM and TEM

2014 ◽  
Vol 8 (3) ◽  
Author(s):  
Tang Ing Hua ◽  
Rita Sundari
Keyword(s):  
Electron Microscope ◽  
Volume Expansion ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Semiconducting Materials ◽  
Thermal Agitation ◽  
X Ray ◽  
Transmission Electron ◽  
Fabrication And Characterization

This study has encountered with the fabrication of ferrites (Mg and Mn) using citric acid as anionic surfactant in sol-gel method followed by calcinations at varied temperatures (300, 600, 800°C) for 2h, respectively. The fabricated ferrites have been characterized by FTIR (Fourier Transform Infrared Spectroscopy), XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope) and TEM (Transmission Electron Microscope). The FTIR spectrum for MnFeO3 shows that some functional groups already removed under 300°C calcination due to several oxidation numbers possessed by Mn leading to more flexibility. The XRD diffractograms for both MgFe2O4 and MnFeO3 show that the transition phase from amorphous to crystalline structure occurred in the temperature range of 300-600°C. The SEM mappings based on the Fe distribution for both MgFe2O4 and MnFeO3 show that more Fe distributed over the ferrites surface at 600 and 800°C, while the SEM mappings for both ferrites (Mg and Mn) show less Fe distribution at 300°C calcination, thus, it indicates more repulsion force bearing by higher amounts of Fe atoms at higher thermal agitation due to volume expansion. The TEM spectra proved that both ferrites existed as crystals after calcined at 600°C. The fabricated ferrites have remarkable electrical properties useful for the manufacture of semiconducting materials.

Synthesis and Characterization of LiZn Ferrites/Carbon Nanotubes (CNTs) Temperature Control Biomaterials

2016 ◽  
Vol 680 ◽  
pp. 189-192
Author(s):  
Zhao Jun Liu ◽  
Kang Ning Sun ◽  
Ai Min Li ◽  
Xiao Ning Sun ◽  
Shu Pin Zhang
Keyword(s):  
Electron Microscope ◽  
Temperature Control ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Transmission Electron ◽  
Subsequent Calcination ◽  
Different Content

In this study, LiZn ferrites with different content of CNTs (1%-9%) were successfully prepared by a sol-gel method. X-ray diffraction pattern exhibit a relatively high crystallinity of the Li0.25Zn0.5Fe2.25O4/CNTs composite, and the CNTs still exist after acid treatment and subsequent heat treatment. Then the composite was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM), the results demonstrate that the particles are nearly spherical in shape and agglomerated to some extent. By a sol-gel method and subsequent calcination, the temperature of LiZn ferrites/CNTs temperature control biomaterials gradually increase and maintain at a certain temperature in the alternating magnetic field, so it can be a potential material used for hyperthermia applications.

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