Preparation and characterization of surface modified silica nanoparticles with organo-silane compounds

Lee, Chang-Hun; Chung, Wonkeun; Kim, Joong Yeon; Kim, Sung Hyun

doi:10.1016/j.colsurfa.2011.04.010

Cited by 54 publications

(34 citation statements)

References 26 publications

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“…The aqueous aminopropyl silica sol is stable at 4ºC for at least three months. becomes more and more negative by increasing the pH due to the dissociation of surface silanol groups in agreement with previous measurements [37][38][39]. The surface charge of the aminopropyl-modified silica nanoparticles becomes positive below pH 6.2 (isoelectric point) due to the protonation of surface amino groups.…”

Section: Aminopropyl Silica Sol In Watersupporting

confidence: 91%

Preparation, purification, and characterization of aminopropyl-functionalized silica sol

Pálmai

Nagy

Mihály

et al. 2013

Journal of Colloid and Interface Science

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A new, simple and "green" method was developed for the surface modification of 20 nm diameter Stöber silica particles with 3-aminopropyl(diethoxy)methylsilane in ethanol. The bulk polycondensation of the reagent was inhibited and the stability of the sol preserved by adding a small amount of glacial acetic acid after appropriate reaction time. Centrifugation, ultrafiltration and dialysis were compared in order to choose a convenient purification technique that allows the separation of unreacted silylating agent from the nanoparticles without destabilizing the sol. The exchange of the solvent to acidic water during the purification yielded a stable colloid, as well. Structural and morphological analysis of the obtained aminopropyl silica was performed using transmission electron microscopy (TEM), dynamic light scattering (DLS) and zeta potential measurements, Fourier-transform infrared (FTIR), 13 C and 29 Si MAS nuclear magnetic resonance (NMR) spectroscopies, as well as small angle X-ray scattering (SAXS). Our investigations revealed that the silica nanoparticle surfaces were partially covered with aminopropyl groups, and multilayer adsorption followed by polycondensation of the silylating reagent was successfully avoided. The resulting stable aminopropyl silica sol (ethanolic or aqueous) is suitable for biomedical uses due to its purity.

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Section: Aminopropyl Silica Sol In Watersupporting

confidence: 91%

Preparation, purification, and characterization of aminopropyl-functionalized silica sol

Pálmai

Nagy

Mihály

et al. 2013

Journal of Colloid and Interface Science

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“…[6,20,22,25,26] Mesoporous silica nanoparticles (MSNs) are ac lass of OMSs that are particularly importanti nt he field of nanomedicine. [19,[28][29][30][31][32][33][34] It can be obtained from organosilanes such as 3-aminopropyltriethoxysilane (APTS, the most commonly employed), 3-aminopropylmethyldiethoxysilane and 3-aminopropyl dimethylethox-ysilane. [22,27] In the variousa pplications mentioned above, the aminopropylf unctional group plays an important role.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Interaction of Water Vapour with Aminopropyl Groups on the Surface of Mesoporous Silica Nanoparticles

et al. 2017

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The interaction of water molecules with the surface of hybrid silica-based mesoporous materials is studied by Si, H and C solid-state NMR and IR spectroscopy, with the support of ab initio calculations. The surface of aminopropyl-grafted mesoporous silica nanoparticles is studied in the dehydrated state and upon interaction with controlled doses of water vapour. Former investigations described the interactions between aminopropyl and residual SiOH groups; the present study shows the presence of hydrogen-bonded species (SiOH to NH ) and weakly interacting "free" aminopropyl chains with restricted mobility, together with a small amount of protonated NH groups. The concentration of the last-named species increased upon interaction with water, and this indicates reversible and fast proton exchange from water molecules to a fraction of the amino groups. Herein, this is discussed and explained for the first time, by a combination of experimental and theoretical approaches.

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“…Modification of silica with a silane coupling agent can change the characteristic surface from hydrophilic to hydrophobic. Surface modification with vinyl-and mercapto-silanes reduces the silica aggregate size without re-agglomeration of the silica, but modification with an aminosilane tends to increase the silica agglomerate size because of its hydrophilicity that leads to the formation of hydrogen bonds between particles/aggregates [7,8]. Organic monomers such as styrene, isoprene, and butadiene have been used to modify the silica surface to obtain a hydrophobic character through in situ polymerization of the monomers adsorbed on the surface via bilayers of surfactants [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Silane grafted natural rubber and its compatibilization effect on silica-reinforced rubber tire compounds

Sengloyluan¹,

Sahakaro²,

Dierkes³

et al. 2017

Express Polym. Lett.

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Abstract. Natural Rubber (NR) grafted with 3-octanoylthio-1-propyltriethoxysilane (NXT) was prepared by melt mixing using 1,1′-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane as initiator at 140°C with NXT contents of 10 and 20 parts per hundred rubber [phr] and initiator 0.1 phr. The silane grafted on NR molecules was confirmed by Fourier transform infrared (FTIR), proton nuclear magnetic resonance ( 1 H-NMR) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM-EDX). Based on 1 H-NMR, the use of 10 and 20 phr (parts per hundred resin) of silane resulted in grafted NXT onto NR of 0.66 and 1.32 mol%, respectively, or a grafting efficiency of approx.38%. The use of NXT-grafted NR as compatibilizer in silica-filled NR compounds, to give a total amount of NXT in both grafted and non-grafted forms in the range of 0.8-6.1 wt% relative to the silica, decreases the Mooney viscosity and Payne effect of the compounds, improves filler-rubber interaction, and significantly increases the tensile properties of the silica-filled NR-compounds compared to the non-compatibilized one. At the same silane-content, the use of silane-grafted NR gives slightly better properties than the straight use of the same silane. With sulfur compensation, the use of NXT-grafted-NR with about 6 wt% NXT relative to the silica gives technical properties that reach the levels obtained for straight use of bis-(3-triethoxysilyl-propyl)tetrasulfide (TESPT) at 8.6 wt% relative to the silica.

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Preparation and characterization of surface modified silica nanoparticles with organo-silane compounds

Cited by 54 publications

References 26 publications

Preparation, purification, and characterization of aminopropyl-functionalized silica sol

Preparation, purification, and characterization of aminopropyl-functionalized silica sol

Investigating the Interaction of Water Vapour with Aminopropyl Groups on the Surface of Mesoporous Silica Nanoparticles

Silane grafted natural rubber and its compatibilization effect on silica-reinforced rubber tire compounds

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