Particle size, uniformity, and mesostructure control of magnetic core/mesoporous silica shell nanocomposite spheres

2006 ◽  
Vol 21 (12) ◽  
pp. 3080-3089 ◽  
Author(s):  
Wenru Zhao ◽  
Jianlin Shi ◽  
Hangrong Chen ◽  
Lingxia Zhang
Keyword(s):  
Particle Size ◽  
Mesoporous Silica ◽  
Pore Diameter ◽  
Magnetic Core ◽  
Silica Shell ◽  
Synthesis Mechanism ◽  
Synthesis Conditions ◽  
Starting Solution ◽  
Size Uniformity ◽  
Acidic Conditions

Well-structured and monodisperse nanocomposite spheres with a magnetic core/mesoporous silica shell structure (MCMS) were obtained. The effects on the structure and morphology of the MCMS spheres were investigated under various synthesis conditions, including reaction time, quantity of silicate sources of tetraethoxysilane (TEOS) and n-octadecyltrimethoxysilane (C18TMS), ratio of TEOS/C18TMS, and ratio of H2O/EtOH in the starting solution. The particle size of the MCMS spheres and pore diameter are tunable in a certain range with 100% yield. A synthesis mechanism of the mesoporous silica shell was proposed that proceeds via three main stages. The silica shell proved to be effective on protecting the cores from leaching out in acidic conditions.

Fabrication of Uniform Magnetic Nanocomposite Spheres with a Magnetic Core/Mesoporous Silica Shell Structure

2005 ◽  
Vol 127 (25) ◽  
pp. 8916-8917 ◽  
Author(s):  
Wenru Zhao ◽  
Jinlou Gu ◽  
Lingxia Zhang ◽  
Hangrong Chen ◽  
Jianlin Shi
Keyword(s):  
Mesoporous Silica ◽  
Shell Structure ◽  
Magnetic Core ◽  
Silica Shell ◽  
Magnetic Nanocomposite

scholarly journals Synthesis of Magnetic Core–Mesoporous Silica Shell Nanoparticles Using Anionic Surfactant and Their Application for Ketoprofen Control Release

2012 ◽  
Vol 41 (10) ◽  
pp. 1357-1359 ◽  
Author(s):  
Ahmed Mohamed El-Toni ◽  
Aslam Khan ◽  
Joselito Puzon Labis ◽  
Mohamed Abbas Ibrahim ◽  
Mansour Al-hoshan
Keyword(s):  
Mesoporous Silica ◽  
Anionic Surfactant ◽  
Control Release ◽  
Magnetic Core ◽  
Silica Shell ◽  
Shell Nanoparticles

Au capped magnetic core/mesoporous silica shell nanoparticles for combined photothermo-/chemo-therapy and multimodal imaging

Biomaterials ◽  
2012 ◽  
Vol 33 (3) ◽  
pp. 989-998 ◽  
Author(s):  
Ming Ma ◽  
Hangrong Chen ◽  
Yu Chen ◽  
Xia Wang ◽  
Feng Chen ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Multimodal Imaging ◽  
Magnetic Core ◽  
Silica Shell ◽  
Shell Nanoparticles

Plasmolysis-Inspired Nanoengineering of Functional Yolk–Shell Microspheres with Magnetic Core and Mesoporous Silica Shell

2017 ◽  
Vol 139 (43) ◽  
pp. 15486-15493 ◽  
Author(s):  
Qin Yue ◽  
Jialuo Li ◽  
Yu Zhang ◽  
Xiaowei Cheng ◽  
Xiao Chen ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Magnetic Core ◽  
Silica Shell

scholarly journals Design of hybrid protein-coated magnetic core-mesoporous silica shell nanocomposites for MRI and drug release assessed in a 3D tumor cell model

2019 ◽  
Vol 30 (17) ◽  
pp. 174001 ◽  
Author(s):  
Mathilde Ménard ◽  
Florent Meyer ◽  
Christine Affolter-Zbaraszczuk ◽  
Morgane Rabineau ◽  
Alexandre Adam ◽  
...  
Keyword(s):  
Drug Release ◽  
Mesoporous Silica ◽  
Tumor Cell ◽  
Cell Model ◽  
Magnetic Core ◽  
Silica Shell ◽  
Hybrid Protein

Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants

2003 ◽  
Vol 68 (10) ◽  
pp. 2019-2031 ◽  
Author(s):  
Markéta Zukalová ◽  
Jiří Rathouský ◽  
Arnošt Zukal
Keyword(s):  
Mesoporous Silica ◽  
Ethylene Oxide ◽  
Sodium Metasilicate ◽  
Spherical Particles ◽  
Structure Directing Agent ◽  
Inorganic Species ◽  
Poly Ethylene Oxide ◽  
Acidic Conditions ◽  
Poly Ethylene ◽  
Hydrolysis Of

A new procedure has been developed, which is based on homogeneous precipitation of organized mesoporous silica from an aqueous solution of sodium metasilicate and a nonionic poly(ethylene oxide) surfactant serving as a structure-directing agent. The decrease in pH, which induces the polycondensation of silica, is achieved by hydrolysis of ethyl acetate. Owing to the complexation of Na+ cations by poly(ethylene oxide) segments, assembling of the mesostructure appears to occur under electrostatic control by the S0Na+I- pathway, where S0 and I- are surfactant and inorganic species, respectively. As the complexation of Na+ cations causes extended conformation of poly(ethylene oxide) segments, the pore size and pore volume of organized mesoporous silica increase in comparison with materials prepared under neutral or acidic conditions. The assembling of particles can be fully separated from their solidification, which results in the formation of highly regular spherical particles of mesoporous silica.

Direct manipulation of particle size and morphology of ordered mesoporous silica by flow synthesis

RSC Advances ◽  
2015 ◽  
Vol 5 (18) ◽  
pp. 13331-13340 ◽  
Author(s):  
T. N. Ng ◽  
X. Q. Chen ◽  
K. L. Yeung
Keyword(s):  
Particle Size ◽  
Mesoporous Silica ◽  
Hollow Spheres ◽  
Ordered Mesoporous Silica ◽  
Direct Manipulation ◽  
Flow Synthesis ◽  
Precise Control ◽  
Ordered Mesoporous ◽  
Particle Size And Morphology ◽  
Size And Morphology

Flow-synthesis of mesoporous silica allows deliberate and precise control over the size and shapes and enables the preparation of complex microstructures (i.e., hollow spheres).

Nanostructured Polymetallic Powders to Create New Functional Materials on its Base

2015 ◽  
Vol 670 ◽  
pp. 49-54 ◽  
Author(s):  
Yuriy A. Zaharov ◽  
Valeriy M. Pugachev ◽  
Kseniya A. Datiy ◽  
Anna N. Popova ◽  
Anastasiya S. Valnyukova ◽  
...  
Keyword(s):  
Particle Size ◽  
Phase Diagrams ◽  
Spatial Organization ◽  
Functional Materials ◽  
Particle Morphology ◽  
Cloud Type ◽  
Synthesis Conditions ◽  
Micron Size ◽  
Common Nature ◽  
20 Nm

In the paper, the particle morphology is considered and the slices of phase diagrams of nanosystems agreeable to the synthesis conditions are constructed according to the data obtained earlier by authors, as well as new results of the study of nanostructured Fe-Co, Fe-Ni, Co-Ni, Fe-Co-Ni, Fe-Pt, Cu-Ni and Ni-Cd powders. It is found that all considered polymetallic systems have common nature of the particle size spatial organization, i.e., 7-20 nm nanocrystals (for different systems) form highly compact aggregates (40-100 nm) which put together into loose porous agglomerates (up to 200-250 nm) and then into unconsolidated micron size formation of cloud type. It is classified uncovered features of nanostructured polymetallic phase diagrams in comparison with phase diagrams of bulk systems. Magnetic properties of nanosystems are studied.

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