Anhydride modified silica nanoparticles: Preparation and characterization

Barabanova, A. I.; Pryakhina, T. A.; Афанасьев, Е. С.; Zavin, B. G.; Vygodskii, Ya. S.; Аскадский, А.А.; Philippova, Olga E.; Khokhlov, Alexei R.

doi:10.1016/j.apsusc.2011.11.057

Cited by 34 publications

(22 citation statements)

References 18 publications

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“…Different gold coverage on the SiO 2 and TiO 2 cores may be associated with the different content of OH groups on the surface of non-functionalized SiO 2 and TiO 2 cores, which may be up to four times higher for TiO 2 [37,38,39]. The higher number of OH groups on the surface of TiO 2 particles may result in higher number of NH 2 groups after functionalization step and thus provide more anchoring groups for AuNPs binding.…”

Section: Resultsmentioning

confidence: 99%

Application of Turkevich Method for Gold Nanoparticles Synthesis to Fabrication of SiO2@Au and TiO2@Au Core-Shell Nanostructures

et al. 2015

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The Turkevich synthesis method of Au nanoparticles (AuNPs) was adopted for direct fabrication of SiO2@Au and TiO2@Au core-shell nanostructures. In this method, chloroauric acid was reduced with trisodium citrate in the presence of amine-functionalized silica or titania submicroparticles. Core-shells obtained in this way were compared to structures fabricated by mixing of Turkevich AuNPs with amine-functionalized silica or titania submicroparticles. It was found that by modification of reaction conditions of the first method, such as temperature and concentration of reagents, control over gold coverage on silicon dioxide particles has been achieved. Described method under certain conditions allows fabrication of semicontinuous gold films on the surface of silicon dioxide particles. To the best of our knowledge, this is the first report describing use of Turkevich method to direct fabrication of TiO2@Au core-shell nanostructures.

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Section: Resultsmentioning

confidence: 99%

Application of Turkevich Method for Gold Nanoparticles Synthesis to Fabrication of SiO2@Au and TiO2@Au Core-Shell Nanostructures

et al. 2015

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“…The main causes are the increase of real surface area, the removal of surface contaminants and the generation of hydroxyl groups on the surface that increase the probability of interactions between the activated surface and the ethoxy groups of the silane [11,31,32]. Ti_N_TSP contact angle values, however, increased 14 compared to Ti_N due to the hydrophobic behavior of the silane.…”

Section: Discussionmentioning

confidence: 99%

Anhydride-functional silane immobilized onto titanium surfaces induces osteoblast cell differentiation and reduces bacterial adhesion and biofilm formation

Godoy-Gallardo

Guillem-Marti

Sevilla

et al. 2016

Materials Science and Engineering: C

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Bacterial infection in dental implants along with osseointegration failure usually leads to loss of the device. Bioactive molecules with antibacterial properties can be attached to titanium surfaces with anchoring molecules such as silanes, preventing biofilm formation and improving osseointegration. Properties of silanes as molecular binders have been thoroughly studied, but research on the biological effects of these coatings is scarce. The aim of the present study was to determine the in vitro cell response and antibacterial effects of triethoxysilypropyl succinic anhydride (TESPSA) silane anchored on titanium surfaces. X-ray photoelectron spectroscopy confirmed a successful silanization. The silanized surfaces showed no cytotoxic effects. Gene expression analyses of Sarcoma Osteogenic (SaOS-2) osteoblast-like cells cultured on TESPSA silanized surfaces reported a remarkable increase of biochemical markers related to induction of osteoblastic cell differentiation. A manifest decrease of bacterial adhesion and biofilm formation at early stages was observed on treated substrates, while favoring cell adhesion and spreading in bacteria-cell co-cultures.Surfaces treated with TESPSA could enhance a biological sealing on implant surfaces against bacteria colonization of underlying tissues. Furthermore, it can be an effective anchoring platform of biomolecules on titanium surfaces with improved osteoblastic differentiation and antibacterial properties.

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“…This might be due to the structure of the TESPSA, which might have steric hindrance during cross‐linking, resulting in less bonds formation. For example, one evidence of the steric hindrance was found to between the anhydride groups and approaching TESPSA species during immobilizing TESPSA on the surface of nanoparticles …”

Section: Discussionmentioning

confidence: 99%

“…For example, one evidence of the steric hindrance was found to between the anhydride groups and approaching TESPSA | 1913 species during immobilizing TESPSA on the surface of nanoparticles. 42 As shown in Figure 9, the surface modification of MK from hydrophobic to hydrophilic was achieved by compositing it with APTES, however, at pH range 6-7, amino groups on the surface of the cross-linking product should attract protons. This results in a positive charge on cross-linking product particles, making it incompatible with negative silica particles, thus resulting in an unstable suspension.…”

Section: Modification Of Surface Characteristics Of Fillersmentioning

confidence: 99%

Water‐based freeze casting: Adjusting hydrophobic polymethylsiloxane for obtaining hierarchically ordered porous SiOC

et al. 2017

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The hydrophobic properties of methyl poly siloxane (MK) were pushed into the “hydrophilic” range by cross‐linking it with (3‐aminopropyl)triethoxysilane (APTES) and subsequent pyrolysis to enable water‐based freeze casting. Filler properties are investigated by varying the ratios of MK to APTES (1:1, 1:2, 1:3, 1:4, 1:5), and pyrolysis temperatures (400°C, 500°C, 600°C) for the purpose of determining an optimal set of characteristics for freeze casting. Additionally, filler selection for this purpose is facilitated by analysis of zeta potential values and vapor adsorption. It was found that water‐based freeze casting with hybrid fillers, followed by a pyrolysis step (600°C‐700°C), leads to a SiOC ceramic monolith with a lamellar pore morphology and a hierarchically ordered micro/meso/macropore structure. Samples pyrolyzed at 1000°C contain mesopores, having a SSA as high as 51.6 m2/g. The hierarchically porous structure is very promising for applications involving gas or liquid transportation.

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Anhydride modified silica nanoparticles: Preparation and characterization

Cited by 34 publications

References 18 publications

Application of Turkevich Method for Gold Nanoparticles Synthesis to Fabrication of SiO2@Au and TiO2@Au Core-Shell Nanostructures

Application of Turkevich Method for Gold Nanoparticles Synthesis to Fabrication of SiO2@Au and TiO2@Au Core-Shell Nanostructures

Anhydride-functional silane immobilized onto titanium surfaces induces osteoblast cell differentiation and reduces bacterial adhesion and biofilm formation

Water‐based freeze casting: Adjusting hydrophobic polymethylsiloxane for obtaining hierarchically ordered porous SiOC

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