The Fabrication of Nanometer- and Micrometer-Sized Silica Hollow Spheres

2014 ◽  
Vol 998-999 ◽  
pp. 111-114
Author(s):  
Hui Liu ◽  
Fang Yan ◽  
Hong Jie Fang ◽  
Li Dong Zhang
Keyword(s):  
Adsorption Process ◽  
Hollow Spheres ◽  
Shell Structures ◽  
Core Shell ◽  
Drying Process ◽  
Melamine Formaldehyde ◽  
Preparation Methods ◽  
Silica Colloid ◽  
In Situ Coating

Using melamine formaldehyde (MF) microspheres as hard templates and silica colloid as shell precursors, core-shell structures of silica-coated MF microspheres were prepared by the electrostatic adsorption process or spray drying inspired in-situ coating and drying process. Furthermore, nanometer- and micrometer-sized silica hollow spheres were obtained by calcinations in air. The influence of preparation methods and ratio of silica colloid to MF microspheres on the composition, the morphology and size of the core-shell intermediates and the hollow spheres were studied with FTIR, SEM and TEM techniques.

In situ electropolymerised silica–polyaniline core–shell structures: Electrode modification and enzyme biosensor enhancement

2007 ◽  
Vol 52 (5) ◽  
pp. 1865-1870 ◽  
Author(s):  
Xiliang Luo ◽  
Anthony J. Killard ◽  
Aoife Morrin ◽  
Malcolm R. Smyth
Keyword(s):  
Shell Structures ◽  
Core Shell ◽  
Electrode Modification ◽  
Enzyme Biosensor

Preparation of PS@SiO2, PS@TiO2，PS@TiO2/SiO2 Core-Shell Composites by a Spray Drying Process and Their Hollow Spheres after Removing PS Cores by Calcinations

2011 ◽  
Vol 194-196 ◽  
pp. 389-392
Author(s):  
Ling Li ◽  
Hong Liang Li ◽  
Ying Chun Zhu ◽  
Ai Ping Fu ◽  
Yong Wan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Spray Drying ◽  
Hollow Spheres ◽  
Nitrogen Adsorption ◽  
Core Shell ◽  
Drying Process ◽  
The Core ◽  
Adsorption Desorption ◽  
Drying Chamber ◽  
Scanning Electron

Polystyrene (PS) spheres encapsulated core-shell composites of SiO2or TiO2nanoparticles were prepared by the spray drying technique and hollow spheres of SiO2or TiO2nanoparticles were then derived by removing the PS cores with calcinations. The PS spheres were dispersed into the SiO2or TiO2colloids, forming a suspension and then the suspensions were sprayed to form micrometer-sized droplets, as the droplets rush through the drying chamber, the PS spheres were encapsulated into the core of SiO2or TiO2particles due to the high temperatures and the instant evaporation, obtaining PS@SiO2, PS@TiO2or PS@SiO2/TiO2core-shell composites. After removing the PS core by calcination at 550°C, SiO2or TiO2hollow spheres were then derived. The influence of drying temperature, the concentration of the SiO2or TiO2particles and the ratio of PS sphere to the particles on the structures and specific surface area of the hollow spheres were studied with scanning electron microscopy (SEM) and nitrogen adsorption-desorption measurements.

Core–shell structured SnO2 hollow spheres–polyaniline composite as an anode for sodium-ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (40) ◽  
pp. 31465-31471 ◽  
Author(s):  
Xingxing Zhao ◽  
Zhian Zhang ◽  
Fuhua Yang ◽  
Yun Fu ◽  
Yanqing Lai ◽  
...  
Keyword(s):  
Anode Material ◽  
Hollow Spheres ◽  
Rate Capability ◽  
Sodium Ion ◽  
Core Shell ◽  
Sodium Ion Batteries ◽  
Long Cycle Life ◽  
Pani Composite ◽  
Good Rate Capability

SnO2@PANI composite has been synthesized by the in situ polymerization of aniline monomers in the presence of SnO2 hollow spheres. Using as an anode material for sodium-ion batteries, the composite exhibited long cycle life and good rate capability.

scholarly journals Microfluidic Synthesis and Analysis of Bioinspired Structures Based on CaCO3 for Potential Applications as Drug Delivery Carriers

Pharmaceutics ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 139
Author(s):  
Ekaterina V. Lengert ◽  
Daria B. Trushina ◽  
Mikhail Soldatov ◽  
Alexey V. Ermakov
Keyword(s):  
Drug Delivery ◽  
Calcium Carbonate ◽  
Biological Systems ◽  
Shell Structures ◽  
Advanced Materials ◽  
Core Shell ◽  
Synthesis Parameters ◽  
Potential Applications ◽  
New Strategies

Naturally inspired biomaterials such as calcium carbonate, produced in biological systems under specific conditions, exhibit superior properties that are difficult to reproduce in a laboratory. The emergence of microfluidic technologies provides an effective approach for the synthesis of such materials, which increases the interest of researchers in the creation and investigation of crystallization processes. Besides accurate tuning of the synthesis parameters, microfluidic technologies also enable an analysis of the process in situ with a range of methods. Understanding the mechanisms behind the microfluidic biomineralization processes could open a venue for new strategies in the development of advanced materials. In this review, we summarize recent advances in microfluidic synthesis and analysis of CaCO3-based bioinspired nano- and microparticles as well as core-shell structures on its basis. Particular attention is given to the application of calcium carbonate particles for drug delivery.

scholarly journals On the assessment of incorporation of CNT–TiO2 core–shell structures into nanoparticle TiO2 photoanodes in dye-sensitized solar cells

2019 ◽  
Vol 18 (7) ◽  
pp. 1840-1850 ◽  
Author(s):  
H. M. Ghartavol ◽  
M. R. Mohammadi ◽  
A. Afshar ◽  
Y. Li
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Dye Sensitized Solar Cells ◽  
Shell Structures ◽  
Core Shell ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Core–shell nanotubes were synthesized by in situ deposition of TiO2 on non-covalently functionalized CNTs. TiO2 photoanodes decorated with TiO2@CNT showed an increase of 37% in the device's power conversion efficiency.

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