Surface properties of submicrometer silica spheres modified with aminopropyltriethoxysilane and phenyltriethoxysilane

Wu, Zhijian; Xiang, Hong; Kim, Tae-Hoon; Chun, Myung Suk; Lee, Kangtaek

doi:10.1016/j.jcis.2006.08.055

Cited by 167 publications

(127 citation statements)

References 30 publications

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“…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. This value is, however, lower than was found previously in the literature for 150 nm diameter silica nanoparticles prepared from 3-aminopropyl-triethoxysilane [40]. We assume that this difference is mainly due to the incomplete surface modification of our silica nanoparticles.…”

Section: Aminopropyl Silica Sol In Watercontrasting

confidence: 63%

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 Watercontrasting

confidence: 63%

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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“…According to Wua et al (2006) the weight loss below 150°C was due to water evaporation. The weight loss for PTES-SBA-15 sample during first region does not differ much with pure SBA-15.…”

Section: Resultsmentioning

confidence: 99%

“…A new material with larger pore called Santa Barbara Amorphous-15 (SBA-15) has been of recent interest. This type of mesoporous silica with amorphous, hexagonal shape and two-dimension has characteristics of narrow pore size distribution, thermally stable, inert, harmless and cheap (Wua et al, 2006). Their thick wall leads to high thermal and mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

“…Modifed SBA-15 using PTES produces particle with more uniform size and shape (Wua et al, 2006). One of significant characteristics of PTES is its hydrophobic nature of phenyl group.…”

Section: Introductionmentioning

confidence: 99%

“…This hydrophobic nature can be improved by adjusting ratio of phenyl loading and grafting phenyl loaded sample with trimethylchlorosilane (Gokulakrishnana et al, 2013). Due to its hydrophobic characteristics, PTES particle shows low water vapour adsorption (Wua et al, 2006) and small weight loss during TGA analysis (Gokulakrishnana et al, 2013). Because of incorporation of hydrophobic molecule, the hydrothermal stability of membrane can be improved (Li et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermogravimetric Analysis (TGA) Profile at Different Calcination Conditions for Synthesis of PTES-SBA-15

Rahmat

Sadon

Yusof

2017

American Journal of Applied Sciences

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The aim of this work is to study the effects of calcination condition on the properties of mesoporous silica, SBA-15 modified with phenyl group of organosilane. Functional group SBA-15 were synthesized and hydrothermally aged. The surfactant template was conventionally removed by calcination at varied temperature and duration. Thermogravimetric Analysis (TGA) was employed to characterize the pure and modified SBA-15. The TGA profile presented here would include modified SBA-15 functionalized using two different methods, directsynthesis and post-grafting. The characterization profile from TGA showed that the temperature of calcination has large influence in determining the effectiveness of surfactant removal and incorporation of alkoxysilane into pure silica whether by post-grafting or direct synthesis method. However, the duration of calcination does not significantly affect these characteristics. Besides, mesoporous structure of SBA-15 by post-grafting method shows higher degree of functionalization than that of direct-synthesis.

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Advancement of Surface by Applying a Seemingly Simple Sol‐gel Oxide Materials

Krzak

Borak

Łukowiak

et al. 2016

Advanced Surface Engineering Materials

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Surface properties of submicrometer silica spheres modified with aminopropyltriethoxysilane and phenyltriethoxysilane

Cited by 167 publications

References 30 publications

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

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

Thermogravimetric Analysis (TGA) Profile at Different Calcination Conditions for Synthesis of PTES-SBA-15

Advancement of Surface by Applying a Seemingly Simple Sol‐gel Oxide Materials

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