pH Affects Sol–Gel Formation of Core–Shell Mesoporous Silica Coatings on Polyamide

2013 ◽  
Vol 52 (2) ◽  
pp. 779-784 ◽  
Author(s):  
Junia N. M. Batista ◽  
Emerson H. de Faria ◽  
Paulo S. Calefi ◽  
Katia J. Ciuffi ◽  
Eduardo J. Nassar ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Sol Gel ◽  
Core Shell ◽  
Gel Formation ◽  
Silica Coatings

scholarly journals Orienting the Pore Morphology of Core-Shell Magnetic Mesoporous Silica with the Sol-Gel Temperature. Influence on MRI and Magnetic Hyperthermia Properties

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 971
Author(s):  
Alexandre Adam ◽  
Ksenia Parkhomenko ◽  
Paula Duenas-Ramirez ◽  
Clémence Nadal ◽  
Geoffrey Cotin ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Pore Size ◽  
Sol Gel ◽  
Specific Area ◽  
Magnetic Hyperthermia ◽  
Core Shell ◽  
Pore Morphology ◽  
Channel Network ◽  
Size And Morphology

The controlled design of robust, well reproducible, and functional nanomaterials made according to simple processes is of key importance to envision future applications. In the field of porous materials, tuning nanoparticle features such as specific area, pore size and morphology by adjusting simple parameters such as pH, temperature or solvent is highly needed. In this work, we address the tunable control of the pore morphology of mesoporous silica (MS) nanoparticles (NPs) with the sol-gel reaction temperature (Tsg). We show that the pore morphology of MS NPs alone or of MS shell covering iron oxide nanoparticles (IO NPs) can be easily tailored with Tsg orienting either towards stellar (ST) morphology (large radial pore of around 10 nm) below 80 °C or towards a worm-like (WL) morphology (small randomly oriented pores channel network, of 3–4 nm pore size) above 80 °C. The relaxometric and magnetothermal features of IO@STMS or IO@WLMS core shell NPs having respectively stellar or worm-like morphologies are compared and discussed to understand the role of the pore structure for MRI and magnetic hyperthermia applications.

Silica Coatings Pigmented with Core-Shell Particles for High-Temperature Radiation Heat Shields

2012 ◽  
Vol 512-515 ◽  
pp. 1074-1077
Author(s):  
Guang Hai Wang ◽  
Yue Zhang ◽  
Yu Feng Chen
Keyword(s):  
High Temperature ◽  
Volume Fraction ◽  
Sol Gel ◽  
Core Shell ◽  
Radiation Heat ◽  
Hollow Glass ◽  
Silica Coatings ◽  
Infrared Transmittance ◽  
Ft Ir ◽  
Shell Particles

Hollow glass micro-beads uniformly coated by a shell of titania with thickness of 50 to 300 nm, were fabricated by wet chemical methods. The pigments were dispersed in silica coatings，then the pigmented coatings were deposited on quartz substrates by sol-gel spin-coating method with a thickness of about 80 µm. SEM, TEM and FT-IR techniques were used to characterize the microstructure and properties of the coatings. FT-IR indicated average infrared transmittance of coatings containing the core-shell particles was significantly lower than that of coatings containing no functional particles or containing hollow glass micro-beads, when the volume fraction of core-shell particles was just 5%. In view of its low infrared transmittance, pigmented silica coatings may find applications in high-temperature heat-insulating materials for reducing radiation heat transfer.

Selective basic etching of bifunctional core–shell composite particles for the fabrication of organic functionalized hollow mesoporous silica nanospheres

2016 ◽  
Vol 40 (1) ◽  
pp. 825-831 ◽  
Author(s):  
Zhenhui Liu ◽  
Lianxi Chen ◽  
Xinshan Ye ◽  
Huogen Yu ◽  
Jie Li ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Sol Gel ◽  
Etching Process ◽  
Composite Particles ◽  
Core Shell ◽  
Silica Nanospheres ◽  
Hollow Mesoporous Silica ◽  
Shell Composite ◽  
Mesoporous Silica Nanospheres

Bifunctional particles were synthesized by a two-step sol–gel reaction of organosilanes, and hollow or rattle-type structures could be fabricated via the basic etching process.

Synthesis of core–shell-structured mesoporous silica nanospheres with dual-pores for biphasic catalysis

2019 ◽  
Vol 43 (15) ◽  
pp. 5833-5838 ◽  
Author(s):  
Juan Wei ◽  
Like Zou ◽  
Yulong Li ◽  
Xiaoming Zhang
Keyword(s):  
Mesoporous Silica ◽  
Sol Gel ◽  
Core Shell ◽  
Silica Nanospheres ◽  
Biphasic Catalysis ◽  
Sol Gel Process ◽  
Oil Water ◽  
Mesoporous Silica Nanospheres

A combination of a sol–gel process and oil–water biphase stratification was developed to fabricate dual-pore structured MSN.

Silica Interlayer Formation of Mesoporous Silica Coatings on Hydroxyapatite Granules

2017 ◽  
Vol 758 ◽  
pp. 19-23 ◽  
Author(s):  
Yoshiyuki Yokogawa ◽  
Atsumasa Shishido ◽  
K. Hiroyasu
Keyword(s):  
Mesoporous Silica ◽  
Magnetron Sputtering ◽  
Protein Adsorption ◽  
Adsorption Capacity ◽  
Sol Gel ◽  
Dip Coating ◽  
Silica Coatings ◽  
Vis Spectroscopy ◽  
Coating Method ◽  
Dip Coating Method

Mesoporous silica (MPS) coatings on hydroxyapatite (HAp) granules and their protein adsorptive capabilities were studied. MPS particles were coated on HAp granules using a dip-coating method, but the HAp granules were not totally covered by the MPS particles. A silica interlayer was formed on the HAp granules via magnetron sputtering or the sol-gel method prior to the coating of the MPS. The HAp granules coated with the silica interlayer were fully covered by the MPS particles. An silica interlayer may offer bonding between the HAp granules and MPS coating. The adsorption of protein on the MPS-coated HAp granules was evaluated by UV-VIS spectroscopy. The adsorption capacity of protein on the HAp granules was improved by the MPS coatings on the HAp granules, and that of the HAp granules coated with the silica interlayer showed a higher protein adsorption capacity.

scholarly journals Ammonia-vapour-induced two-layer transformation of mesoporous silica coatings on various substrates

Vacuum ◽  
2021 ◽  
pp. 110415
Author(s):  
Lenke Kócs ◽  
Borbála Tegze ◽  
Emőke Albert ◽  
Csaba Major ◽  
András Szalai ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silica Coatings ◽  
Ammonia Vapour
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