Hybrid spiropyran–silica nanoparticles with a core-shell structure: sol–gel synthesis and photochromic properties

2010 ◽  
Vol 20 (42) ◽  
pp. 9370 ◽  
Author(s):  
Joachim Allouche ◽  
Aurélie Le Beulze ◽  
Jean-Charles Dupin ◽  
Jean-Bernard Ledeuil ◽  
Sylvie Blanc ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Shell Structure ◽  
Sol Gel ◽  
Core Shell ◽  
Photochromic Properties ◽  
Core Shell Structure ◽  
Sol Gel Synthesis

Sol-gel synthesis of silica/amylose composite particles with core–shell structure

Polymer ◽  
2012 ◽  
Vol 53 (15) ◽  
pp. 3297-3303 ◽  
Author(s):  
Yinhui Li ◽  
Jiwen Hu ◽  
Guojun Liu ◽  
Jinheng Shi ◽  
Wei Li ◽  
...  
Keyword(s):  
Shell Structure ◽  
Sol Gel ◽  
Composite Particles ◽  
Core Shell ◽  
Core Shell Structure ◽  
Sol Gel Synthesis

Preparation and characteristics of calcium carbonate/silica nanoparticles with core-shell structure

2007 ◽  
Vol 294 (1-3) ◽  
pp. 8-13 ◽  
Author(s):  
Hari Bala ◽  
Yishun Zhang ◽  
Haibin Ynag ◽  
Chengyu Wang ◽  
Minggang Li ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Silica Nanoparticles ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure

The Preparation of Fluorescent Nano Dye-Silica Particles by Sol-Gel Process

2007 ◽  
Vol 124-126 ◽  
pp. 651-654 ◽  
Author(s):  
Young Joo Na ◽  
Sang Joon Park ◽  
Ji Hyeon Kim ◽  
Jong Sung Kim
Keyword(s):  
Shell Structure ◽  
Sol Gel ◽  
Silica Nanoparticle ◽  
Fluorescent Dye ◽  
Core Shell ◽  
Fluorescent Intensity ◽  
Sol Gel Process ◽  
Fluorescent Spectrum ◽  
Core Shell Structure ◽  
Trimethoxy Silane

The core-shell structure of dye-silica nanoparticle has been prepared. The dye-silica nanoparticle can be used as a substitute of fluorescent dye for bio analysis. The hybrid organicinorganic nanoparticle was prepared by sol-gel process using organic modified silane as the coupling agent for flourescent dye and silica. The size of the particle was about 50 nm, which was measured by DLS and confirmed by SEM photograph. The fluorescent dye (fluorescein-5-maleimide) was reacted with (3-mercaptopropyl) trimethoxy silane to produce dye-silane compound, followed by the sol-gel reaction with tetraethoxysilane(TEOS) and water to produce core-shell structure. The fluorescent spectrum showed that the fluorescent intensity of dye-silica nanoparticle was higher than that of fluorescent dye.

Preparation, Characterization and Visible-Light Catalytic Activity of Core-Shell Structure NiFe2O4@TiO2 Ferrite Nanoparticles

2016 ◽  
Vol 680 ◽  
pp. 272-277
Author(s):  
Zhou Li Lu ◽  
Peng Zhao Gao ◽  
Rui Xue Ma ◽  
Yu Kun Sun ◽  
Dong Yun Li
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Shell Structure ◽  
Shell Thickness ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Magnetic Core ◽  
Core Shell ◽  
Calcination Temperatures ◽  
Core Shell Structure

The core-shell structure NiFe2O4@TiO2 nanoparticles was successfully prepared using a sol-gel method, the influence of shell thickness and calcination temperatures on the composition, microstructure, magnetic properties and visible-light catalytic activity of the nanoparticles was studied by XRD, TEM, Uv–vis, vibrating sample magnetometer, etc. Results showed the main composition of core in NiFe2O4@TiO2 was spinel ferrite, and the shell was anatase TiO2, and theshell thickness increased significantly with the increase of TiO2 content, ranging from 10nm to 50nm. The Ms and Mr of nanoparticles decreased with the increase of TiO2 content, and no obvious reaction between the magnetic core and shell occurred; visible-light degradation percent of NiFe2O4@TiO2 nanoparticles increased along with the increase of TiO2 content, whereas the recovery rate of it decreased. Degradation percent and the recovery percent of NiFe2O4@TiO2-50 still reached 93.7% and 90.5%, even after 10 cycle times, respectively, possessing the excellent long-term stability.

scholarly journals High Photocatalytic Activity of Fe3O4-SiO2-TiO2Functional Particles with Core-Shell Structure

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Chenyang Xue ◽  
Qiang Zhang ◽  
Junyang Li ◽  
Xiujian Chou ◽  
Wendong Zhang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Photocatalytic Activity ◽  
Shell Structure ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Large Area ◽  
Uniform Size ◽  
Functional Nanoparticles ◽  
Core Shell Structure

This paper describes a novel method of synthesizing Fe3O4-SiO2-TiO2functional nanoparticles with the core-shell structure. The Fe3O4cores which were mainly superparamagnetic were synthesized through a novel carbon reduction method. The Fe3O4cores were then modified with SiO2and finally encapsulated with TiO2by the sol-gel method. The results of characterizations showed that the encapsulated 700 nm Fe3O4-SiO2-TiO2particles have a relatively uniform size distribution, an anatase TiO2shell, and suitable magnetic properties for allowing collection in a magnetic field. These magnetic properties, large area, relative high saturation intensity, and low retentive magnetism make the particles have high dispersibility in suspension and yet enable them to be recovered well using magnetic fields. The functionality of these particles was tested by measuring the photocatalytic activity of the decolouring of methyl orange (MO) and methylene blue (MB) under ultraviolet light and sunlight. The results showed that the introduction of the Fe3O4-SiO2-TiO2functional nanoparticles significantly increased the decoloration rate so that an MO solution at a concentration of 10 mg/L could be decoloured completely within 180 minutes. The particles were recovered after utilization, washing, and drying and the primary recovery ratio was 87.5%.

scholarly journals Preparation, optical properties, and thermal stability of polyvinyl butyral composite films containing core (lanthanum hexaboride)–shell (titanium dioxide)-structured nanoparticles

2021 ◽  
Vol 28 (1) ◽  
pp. 605-612
Author(s):  
Hongbo Tang ◽  
Jian Zhou ◽  
Shengkui Zhong ◽  
Yuchang Su ◽  
Qunwei Shu ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Shell Structure ◽  
Near Infrared ◽  
Sol Gel ◽  
Visible Region ◽  
Polyvinyl Butyral ◽  
Lanthanum Hexaboride ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Structure

Abstract Nano-sized lanthanum hexaboride (LaB6)@ titanium dioxide (TiO2) particles with a core–shell structure has been successfully synthesized via a simple sol–gel method. LaB6@TiO2 particles were used as filler in polyvinyl butyral (PVB) matrix and performance of the TiO2 shell was evaluated. The core–shell nanoparticles were characterized for morphology and structure properties. X-ray diffraction and transmission electron microscope testing results confirm the formation of LaB6–TiO2 core–shell structure. In composite film, LaB6 improved the thermo-decomposing temperature of PVB matrix from 369.2 to 372.8°C, while the same amount of LaB6@TiO2 further increased the temperature to 381.0°C. In addition, TiO2 shell redshifted the maximum transmittance of the film from 605 to 669 nm in the visible region. In the near infrared region, its absorption peak shifted from 1,466 to 1,476 nm. This result will be helpful for the development of transparent and thermal insulating materials.

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