Preparation of silane-coated TiO2 nanoparticles in supercritical CO2

García‐González, Carlos A.; Fraile, Julio; López‐Periago, Ana M.; Domingo, Concepción

doi:10.1016/j.jcis.2009.06.035

Cited by 45 publications

(13 citation statements)

References 59 publications

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“…For the in situ surface-functionalized samples, the mass loss (at 230–460 °C) was assigned to the combustion of the organic part of the silane. The average surface coverages (molecules per square nanometer) of the nanoparticles were calculated based on the specific surface area and the mass loss due to combustion of the organic part, considering loss of C, H, and N of the silanes [ 35 ] ( Table 1 ).…”

Section: Resultsmentioning

confidence: 99%

Functionalized TiO₂ nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents

Dalod¹,

Henriksen

Grande³

et al. 2017

Beilstein J. Nanotechnol.

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A simple, robust and versatile hydrothermal synthesis route to in situ functionalized TiO2 nanoparticles was developed using titanium(IV) isopropoxide as Ti-precursor and selected silane coupling agents (3-aminopropyltriethoxysilane (APTES), 3-(2-aminoethylamino)propyldimethoxymethylsilane (AEAPS), and n-decyltriethoxysilane (DTES)). Spherical nanoparticles (ca. 9 nm) with narrow size distribution were obtained by using DTES or by synthesis performed without silane coupling agents. Rod-like nanoparticles along with 9 nm spherical nanoparticles were formed using aminosilane coupling agents because of a combination of oriented attachment of nanoparticles and specific adsorption of the aminosilane on crystallographic faces of anatase nanoparticles. The nanoparticles were functionalized in situ and became hydrophobic as silanes reacted to form covalent bonds on the surface of TiO2. The versatility of the aqueous synthesis route was demonstrated, and by selecting the type of silane coupling agent the surface properties of the TiO2 nanoparticles could be tailored. This synthesis route has been further developed into a two-step synthesis to TiO2–SiO2 core–shell nanoparticles. Combustion of the silane coupling agents up to 700 °C leads to the formation of a nanometric amorphous SiO2 layer, preventing growth and phase transition of the in situ functionalized nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Functionalized TiO₂ nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents

Dalod¹,

Henriksen

Grande³

et al. 2017

Beilstein J. Nanotechnol.

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“…In this case, sterile conditions were achieved since starch aerogels were gelified under steam sterilization conditions and the solvent exchange to ethanol, being one of the most commonly used antiseptic agent worldwide, promotes the preservation of the sterile conditions. Moreover, during the supercritical drying of the starch gels the high diffusivity of scCO 2 can penetrate the intricate geometry of nanostructured materials like agglomerates of nanoparticles, cyclodextrins, or aerogels, which have been exploited for certain biomedical applications like drug impregnation, encapsulation, or surface treatments [51,52,53] and was herein exploited to favor the sterilizing effect of scCO 2 . Nevertheless, a specific sterilization method should be developed for bio-based aerogels since sterile conditions during all the aerogel processing steps for other biopolymer sources or the lack of environmental contamination during the handling and/or packaging cannot always be guaranteed.…”

Section: Resultsmentioning

confidence: 99%

Sterile and Dual-Porous Aerogels Scaffolds Obtained through a Multistep Supercritical CO2-Based Approach

et al. 2019

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Aerogels from natural polymers are endowed with attractive textural and biological properties for biomedical applications due to their high open mesoporosity, low density, and reduced toxicity. Nevertheless, the lack of macroporosity in the aerogel structure and of a sterilization method suitable for these materials restrict their use for regenerative medicine purposes and prompt the research on getting ready-to-implant dual (macro + meso)porous aerogels. In this work, zein, a family of proteins present in materials for tissue engineering, was evaluated as a sacrificial porogen to obtain macroporous starch aerogels. This approach was particularly advantageous since it could be integrated in the conventional aerogel processing method without extra leaching steps. Physicochemical, morphological, and mechanical characterization were performed to study the effect of porogen zein at various proportions (0:1, 1:2, and 1:1 zein:starch weight ratio) on the properties of the obtained starch-based aerogels. From a forward-looking perspective for its clinical application, a supercritical CO2 sterilization treatment was implemented for these aerogels. The sterilization efficacy and the influence of the treatment on the aerogel final properties were evaluated mainly in terms of absence of microbial growth, cytocompatibility, as well as physicochemical, structural, and mechanical modifications.

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“…16-0027. It is considered that the low solubility of metal ions and the high reaction rate under the supercritical condition lead to rapid nucleation in the reaction [16]. Furthermore, the rapid nucleation occurred in supercritical fluids, promoting the formation of YBO 3 phase.…”

Section: Methodsmentioning

confidence: 99%

Photoluminescence properties of YBO3:Eu3+ phosphors prepared via the solvothermal synthesis under supercritical conditions

Chen

Hsu

2010

Journal of Alloys and Compounds

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Preparation of silane-coated TiO2 nanoparticles in supercritical CO2

Cited by 45 publications

References 59 publications

Functionalized TiO₂ nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents

Functionalized TiO₂ nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents

Sterile and Dual-Porous Aerogels Scaffolds Obtained through a Multistep Supercritical CO2-Based Approach

Photoluminescence properties of YBO3:Eu3+ phosphors prepared via the solvothermal synthesis under supercritical conditions

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Preparation of silane-coated TiO2 nanoparticles in supercritical CO2

Cited by 45 publications

References 59 publications

Functionalized TiO2 nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents

Functionalized TiO2 nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents

Sterile and Dual-Porous Aerogels Scaffolds Obtained through a Multistep Supercritical CO2-Based Approach

Photoluminescence properties of YBO3:Eu3+ phosphors prepared via the solvothermal synthesis under supercritical conditions

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Functionalized TiO₂ nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents

Functionalized TiO₂ nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents