Synthesis and Characterization of Hollow Silica via PMMA as Template

2006 ◽  
Vol 11-12 ◽  
pp. 551-554 ◽  
Author(s):  
Ji Rui Song ◽  
Li Xiong Wen ◽  
Jian Feng Chen ◽  
Hao Min Ding
Keyword(s):  
Shell Structures ◽  
Hollow Silica ◽  
Uniform Coating ◽  
The Core ◽  
Hollow Silica Spheres ◽  
Promising Agent ◽  
New Material ◽  
Ft Ir ◽  
Hydrolysis Of

Submicrosized porous hollow silica spheres with a diameter of 350 nm and a shell thickness of approximately 10 nm were synthesized by a hydrothermal method using PMMA hollow particles as template. Through the hydrolysis of TEOS, a continuous and uniform coating of SiO2 was deposited over the surface of PMMA cores to form the core-shell structures. After calcining to remove the template, a pure hollow silica structure with holes in the shells was obtained. The as-prepared hollow products were characterized with TEM, SEM, EDS, BET and FT-IR. Its large surface area and hollow morphology will make this new material a promising agent for the applications of catalysts, controlled drug delivery and etc.

Preparation and Characterization of Y3Al5O12 (YAG) from An Alkoxide-Derived Polymer

1992 ◽  
Vol 286 ◽  
Author(s):  
Zhiping Jiang ◽  
Wendell E. Rhine
Keyword(s):  
Infrared Spectroscopy ◽  
Yttrium Aluminum Garnet ◽  
Polymeric Materials ◽  
Pyrolysis Products ◽  
Elemental Analyses ◽  
Yttrium Aluminum ◽  
Ft Ir ◽  
Hydrolysis Of ◽  
Controlled Hydrolysis

ABSTRACTThe controlled hydrolysis of Al(O-sec-Bu)3 and Y(O-iso-Pr)3 or the reaction of Y(OOCCH)3 with partially hydrolyzed Al(O-sec-Bu)3 [AlO0.75(O-sec-Bu)1.5] resulted in the formation of soluble polymeric materials. Pyrolysis of these materials under a flow of oxygen led to the formation of yttrium aluminum garnet (YAG) at 650-1500°C. YAG was the only crystalline phase observed during pyrolysis, and the Al/Y ratio of the pyrolysis products and the starting material was identical. However, infrared spectroscopy indicated that carbonate groups and entrained CO2 existed in the products at temperatures up to 1250°C. The pyrolysis chemistry of the precursors and the microstructure of the products were studied by FT-IR, TGA, XRD, SEM and elemental analyses.

scholarly journals Synthesis of poly(γ-tert-butyl L-glutamate): influence of polymerization conditions

2019 ◽  
Vol 16 (3) ◽  
pp. 25
Author(s):  
Phung Thi Thuy Dung ◽  
Nguyen Thi Le Thu
Keyword(s):  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Attenuated Total Reflection ◽  
Resonance Spectroscopy ◽  
Reaction Conditions ◽  
Tert Butyl ◽  
Ft Ir ◽  
Hydrolysis Of ◽  
Polymerization Conditions

This work presents the synthesis and characterization of poly(γ-tert-butyl L-glutamate) (PtBuLG) via a living ring-opening polymerization procedure of γ-tert-butyl L-glutamate N-carboxyanhydride (tBuLG-NCA). The reaction conditions were investigated to optimize the polymerization yield and molecular weight polydispersity. The synthesized PtBuLG was characterized using nuclear magnetic resonance spectroscopy (NMR), gel permeation chromatography (GPC) and attenuated total reflection-Fourier transform infrared (ATR FT-IR. Finally, hydrolysis of PtBuLG resulted in poly(L-glutamic acid) (PLGA).

Preparation and Characterization of TiO2 Nanoparticle with SiO2 Shell

2011 ◽  
Vol 233-235 ◽  
pp. 1188-1191
Author(s):  
Hong Cai ◽  
Yan Chen ◽  
Yun Ying Wu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Chemical Components ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Bonding Phase ◽  
Hydrolysis Of

Nano-TiO2 particles were prepared by sol-gel method, of which the surfaces were coated by SiO2. The coating was achieved by the hydrolysis of sodium silicate (Na2SiO3) in ammonium chloride (NH4Cl). The surface bonding, phase constitution and chemical components of the samples were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy (XPS). The mechanism of the SiO2 coating process onto TiO2 surface was analyzed. Results show that SiO2 particles were immobilized on the TiO2 surface via Ti—O—Si bondings, which formed at the interface. The SiO2 layer on TiO2 surface was amorphous, the photocatalytic performance was decreased of the TiO2 while its stability was enhanced after surface modification.

Optical and Magnetic Studies of Fe3O4/Au Core/Shell Nanocomposites

2019 ◽  
Vol 18 (05) ◽  
pp. 1850033 ◽  
Author(s):  
Al-Sayed A. M. Al-Sherbini ◽  
Gamal El-Ghannam ◽  
Hesham Yehya ◽  
O. Aied Nassef
Keyword(s):  
Shell Structures ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
Visible Absorption ◽  
The Core ◽  
Transmission Electron ◽  
Surface Poisoning ◽  
Shell Particles

In this paper, we report the synthesis of Fe3O4 nanoparticles which are resistant to surface poisoning, has been adopted. Fe3O4 nanoparticles have been successfully coated with Au in the form of a shell with different sizes (Fe3O4/Au Core/Shell). Adjustment of the components’ ratio makes the shell thickness of the core/shell particles tunable. Thus, the presented route yields well-defined core/shell structures of different sizes in the range 15–57[Formula: see text]nm with varying the proportion of Au noble metal to Fe3O4 nanoparticles. The UV-Visible absorption spectra, X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) were applied for the characterization of the formed core/shell structures. Moreover, magnetic properties of the core/shell nanocomposites were also studied using Vibrating Sample Magnetometry (VSM).

scholarly journals Synthesis and Characterization of Hollow Silica Spheres

2015 ◽  
Vol 8 ◽  
pp. 567-576 ◽  
Author(s):  
Marina N. Gorsd ◽  
Luis R. Pizzio ◽  
Mirta N. Blanco
Keyword(s):  
Synthesis And Characterization ◽  
Silica Spheres ◽  
Hollow Silica ◽  
Hollow Silica Spheres

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

Synthesis and Characterization of Ag@C Core–Shell Structures

Nano LIFE ◽  
2014 ◽  
Vol 04 (03) ◽  
pp. 1441008 ◽  
Author(s):  
Daoli Zhao ◽  
Xuefei Guo ◽  
Tingting Wang ◽  
Yuchuan Zheng ◽  
Linlin Wang ◽  
...  
Keyword(s):  
Shell Structures ◽  
High Yield ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
The Core ◽  
Environmental Friendly ◽  
Core Shell Nanoparticles ◽  
Hydrothermal Methods

Ag @ C core–shell structures were prepared using hydrothermal methods by AgNO 3 reduction with ascorbic acid in the presence of polyacrylamide (PAM). Temperature plays a key role in the formation of the core–shell structures. The roles of reactants, surfactant concentrations and reaction time on the morphologies of core–shell nanoparticles were investigated in detail. This synthetic method is one-pot synthesis, which is fast, high-yield and environmental-friendly for fabrication of Ag @ C core–shell structures. The surface properties of core–shell Ag @ C nanoparticles were characterized by Raman spectroscopy.

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