Study on Preparation and Characterization of the SiO2 Photonic Crystal

2018 ◽  
Vol 773 ◽  
pp. 123-127
Author(s):  
Yun Gao Cai ◽  
Xin Qi Li
Keyword(s):  
Photonic Crystals ◽  
Colloidal Particles ◽  
Water Solution ◽  
Mixed Solvents ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
Scanning Electron Microcopy ◽  
Hexagonal Arrangement ◽  
The Stöber Method

SiO2colloidal particles at the size range of 270-910 nm were synthesized by hydrolysis of ethyl silicate (TEOS) in the mixed solvents of TEOS and water under the catalysis of ammonium water solution; the effect of the addition manner of the mixed solution of TEOS and ethanol through immediateness and drop by drop were discussed; besides, two dimentional (2-D) SiO2photonic crystals (PCs) with hexagonal arrangement structure were successfully prepared by the gravity sedimentation method. The X-ray diffraction (XRD) and scanning electron microcopy (SEM) were employed to analyze the crystallinity and morphology of the synthesized SiO2colloidal particles and the 2-D SiO2photonic crystals, the results show that during the progress of the synthesized SiO2colloidal particles by the Stöber method, the addition manner of the mixed solution of TEOS and ethanol through drop by drop instead of immediateness could avoid the double-sized SiO2colloidal particles in a certain extent effectively. The reasons for the experimental results in this investigation have been discussed.

scholarly journals Synthesis and characterization of biomorphic CeO2 obtained by using egg shell membrane as template

2014 ◽  
Vol 8 (2) ◽  
pp. 81-85 ◽  
Author(s):  
Marija Prekajski ◽  
Biljana Babic ◽  
Dusan Bucevac ◽  
Jelena Pantic ◽  
Jelena Gulicovski ◽  
...  
Keyword(s):  
Water Solution ◽  
New Technology ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Shell Membrane ◽  
Bet Method ◽  
Egg Shell Membrane ◽  
Egg Shell ◽  
Chicken Eggs

A new technology based on bio-templating approach was proposed in this paper. Egg-shell membrane (ESM) has been employed as a natural biotemplate. Fibrous oxide ceramics was prepared by wet impregnation of biological template with water solution of cerium nitrate. The template was derived from membranes of fresh chicken eggs. Repeated impregnation, pyrolysis and final calcination in the range of 600 to 1200?C in air resulted in template burnout and consolidation of the oxide layers. At low temperatures, the obtained products had structure which corresponded to the negative replication of biological templates. Unique bio-morphic CeO2 microstructures with interwoven networks were synthesized and characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD), whereas low-temperature nitrogen adsorption (BET) method was used in order to characterize porous properties.

scholarly journals Preparation and Characterization of Ni(OH)2and NiO Mesoporous Nanosheets

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Changyu Li ◽  
Shouxin Liu
Keyword(s):  
Decomposition Method ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
Sodium Dodecylbenzenesulfonate ◽  
Single Crystalline ◽  
X Ray ◽  
Thermal Decomposition Method ◽  
Transmission Electron

Mesoporous nanosheets of single-crystallineβ-nickel hydroxide (β-Ni(OH)2) were successfully synthesized via a facile hydrothermal method using Ni(NO3)2 · 6H2O as precursor in a mixed solution of sodium hydroxide (NaOH) and sodium dodecylbenzenesulfonate (SDBS). Single-crystalline nickel oxide (NiO) mesoporous nanosheets can be obtained through a thermal decomposition method usingβ-Ni(OH)2mesoporous nanosheets as precursor. The influences of SDBS and hydrothermal treatment were carefully investigated; the results showed that they played important roles in the formation ofβ-Ni(OH)2mesoporous nanosheets. The as-obtainedβ-Ni(OH)2and NiO were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermal gravity-differential thermal analysis (TG-DTA), and specific surface area, and pore size test.

PREPARATION AND CHARACTERIZATION OF PLZT FERROELECTRIC INVERSE OPAL

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2769-2774 ◽  
Author(s):  
SU HUANG ◽  
AI-DONG LI ◽  
YUAN GAO ◽  
DI WU ◽  
YONG ZHANG
Keyword(s):  
Photonic Crystals ◽  
Perovskite Phase ◽  
Inverse Opal ◽  
X Ray Diffraction ◽  
Large Area ◽  
X Ray ◽  
Inverse Opals ◽  
Replication Procedure ◽  
Ferroelectric Perovskite

Ferroelectric inverse opals are promising candidates for tunable photonic crystals due to their electro-optical and elasto-optical properties. In this work, inverse opal photonic crystals of (Pb0.9La0.1)(Zr0.65Ti0.35)O3 (PLZT) were prepared through a self-assembled template replication procedure on a large area (typically 2cm × 1cm). The annealing process was optimized. The surface and cross-section were studied by a scanning electron microscope (SEM). X-ray Diffraction (XRD) results proved that PLZT in the ferroelectric perovskite phase was obtained. A band gap was observed in the transmission spectra and compared with the theoretical value.

scholarly journals Synthesis and Characterization of ZnTe Hierarchical Nanostructures

2012 ◽  
Vol 2012 ◽  
pp. 1-5
Author(s):  
Baohua Zhang ◽  
Fuqiang Guo ◽  
Wei Wang
Keyword(s):  
Photoluminescence Spectrum ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
X Ray Diffraction ◽  
Green Luminescence ◽  
Hierarchical Nanostructures ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron Microcopy

Single-crystalline ZnTe hierarchical nanostructures have been successfully synthesized by a simple thermal evaporation technology. The as-prepared products were characterized with X-ray diffraction (XRD), scanning electron microcopy (SEM), transmission electron microscope (TEM), and photoluminescence spectrum (PL). These results showed that the ZnTe hierarchical nanostructures consisted of nanowires and nanolumps. The room temperature PL spectrum exhibited a pure green luminescence centered at 545nm. The growth mechanism of hierarchical nanostructure was also discussed.

Synthesis and Characterization of CdSe Microspheres via Solvothermal Process

2010 ◽  
Vol 654-656 ◽  
pp. 1142-1145
Author(s):  
Juan Yang ◽  
Chuang Liang Zang ◽  
Xiao Nong Cheng
Keyword(s):  
Electron Microscopy ◽  
Heat Treating ◽  
Reducing Agent ◽  
Wurtzite Structure ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
Zinc Blende ◽  
Transmission Electron

CdSe particles with the wurtzite structure have been synthesized via solvothermal method using a mixed solution of triethylenetetramine (TETA) and de-ionized water (DIW) without adding a reducing agent. It was found that the ball-like CdSe precursor with the zinc-blende phase could be transformed to the wurtzite structure after heat-treating at 580 °C in Ar atmosphere and the obtained microspheres were composed of small CdSe particles. The experimental results were compared with that obtained without TETA and it was speculated that TETA in the mixed solution played a role of reducing agent and solvent. Both the as-prepared products and the annealed powders were systematically characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared absorbance spectroscopy (FTIR).

Characterization of Nano Ni/MgO-ZrO2 Catalysts

2012 ◽  
Vol 629 ◽  
pp. 396-400
Author(s):  
Min Yang ◽  
Dian Jun Han ◽  
Guo Fu Li ◽  
Bo Ning ◽  
Hong Tao Cui
Keyword(s):  
Solid Solution ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Catalytic Systems ◽  
X Ray ◽  
Heterogeneous Catalytic ◽  
Scanning Electron Microcopy ◽  
Co Precipitation ◽  
Reduced State

Catalysts of Ni/MgO-ZrO2 were synthesized by the impregnation method and co-precipitation. They were characterized by X-ray diffraction (XRD), Scanning electron microcopy (SEM). It was observed that the monoclinic ZrO2 turned to tetragonal ZrO2 with the Mg2+ mixed. The tetragonal phase ZrO2 is considered as the desired phase which exhibits both acidity and basicity, and active in many heterogeneous catalytic systems. The NiO-MgO solid solution is also discovered on the surface of catalysts. Since the formation of carbon deposit needs a certain size of metal Ni, so the solid solution inhibited the reduced state Ni agglomeration .

Sunlight-Driving Formation and Characterization of Size-Controlled Gold Nanoparticles

2007 ◽  
Vol 7 (2) ◽  
pp. 708-711 ◽  
Author(s):  
Yonglan Luo
Keyword(s):  
Gold Nanoparticles ◽  
Sodium Citrate ◽  
Noble Metal Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron Microcopy ◽  
Uv Visible ◽  
Size Controlled

Exposing a sodium citrate-HAuCl4 aqueous solution to sunlight results in the formation of size-controlled, citrate-capped gold nanoparticles. The gold nanoparticles were characterized by UV-visible, transmission electron microscopy (TEM), scanning electron microcopy (SEM), and X-ray diffraction (XRD) spectroscopic methods. It provides a general methodologyfor the economic, convenient, mild preparation of citrate-capped noble metal nanoparticles.

scholarly journals Preparation and Characterization of TiO2 Nanostructure by TiCl4 Hydrolysis with Additive NaOH

2018 ◽  
Vol 28 (2) ◽  
pp. 100 ◽  
Author(s):  
Rashed Taleb Rasheed
Keyword(s):  
Sodium Hydroxide Solution ◽  
Water Solution ◽  
Ultra Violet ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Atomic Force ◽  
Alcohol Water ◽  
Ft Ir ◽  
Hydrolysis Of

Titanium dioxide (TiO2) nanostructures were synthesized via the hydrolysis of TiCl4 in alcohol / water solution/with sodium hydroxide solution in the ice-bath (0-5 ◦C). The particles were char-acterized by using X-ray diffraction technique (XRD), spectroscopy of Ultra Violet-Visible (UV / Visible) and infrared (FT-IR), atomic force microscope (AFM) and scanning electron micro-scope (SEM) analysis were used in order to gain information about the material, morphology, size and the shape of the particles

Solvothermal Synthesis and Characterization of Hierarchical Calcium Carbonate Spheres

2014 ◽  
Vol 912-914 ◽  
pp. 318-320 ◽  
Author(s):  
Yin Xia Chen ◽  
Xian Bing Ji ◽  
Yu Lian Quan
Keyword(s):  
Calcium Carbonate ◽  
Solvothermal Synthesis ◽  
Mixed Solvents ◽  
Average Diameter ◽  
Synthesis And Characterization ◽  
Solvothermal Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Experimental Parameters

Hierarchical calcium carbonate spheres composed of nanoparticles has been successfully synthesized via a solvothermal process. The structures are fabricated by the reaction of Ca (CH3COO)2with (CO(NH2)2) at 110 °C in diethylene glycolwater mixed solvents in the presence of polyvinylpyrrolidone. The as-prepared products were characterized by field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The characterization results revealed that the average diameter of the hierarchical calcium carbonate spheres is about 5 μm, and the size of the nanoparticals range from 50 to 100 nm. In addition, a small amount of bundle-like aragonite calcium carbonate is also obtained in the experimental parameters.

Preparation and Characterization of a Magnetic Binary System Comprise of γ-Fe2O3 and α-FeO(OH) Nanoparticles

2016 ◽  
Vol 852 ◽  
pp. 264-271
Author(s):  
Xiao Min Gong ◽  
Jian Li ◽  
Jun Ming Li ◽  
Hong Mao
Keyword(s):  
Volume Ratio ◽  
Transformation Method ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Chemically Induced ◽  
Naoh Solution ◽  
Low Crystalline

Magnetic nanoparticles were prepared from a low crystalline ferrihydrite (Fe5O7(OH)·4H2O) precursor by a chemically-induced transformation method using mixed FeCl2/NaOH solution. The products obtained were characterized using a vibrating sample magnetometer, X-ray diffraction, transmission electron microscopy, and energy dispersive X-ray spectroscopy. Experimental results show that while the concentration of NaOH was 0.17 mol/L, and the FeCl2 concentration was increased from 0.09 mol/L to 0.42 mol/L in the mixed solution, the as-prepared products were binary nanoparticle systems comprised of ferrimagnetic γ-Fe2O3 sphere-type particles and antiferromagnetic α-FeO(OH) rod-type particles. The resulting particles were highly crystalline. The volume ratio of γ-Fe2O3 and α-FeO(OH) particles was estimated from magnetization data, which showed that the volume of γ-Fe2O3 particles decreased and α-FeO(OH) particles increased with increasing FeCl2 concentration. Such nanoparticle systems could be suitable for synthesis of binary ferrofluids, which have different behavior to conventional ferrofluids.

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