Surface properties of submicrometer silica spheres modified with aminopropyltriethoxysilane and phenyltriethoxysilane

Zhijian Wu, Hong Xiang, Taehoon Kim, Myung Suk Chun, Kangtaek Lee

Research output: Contribution to journalArticle

114 Citations (Scopus)

Abstract

The surface of submicrometer silica spheres are modified with aminopropyl and phenyl groups through a one-step process. Various experimental techniques, i.e., scanning electron microscopy (SEM), quasi-elastic light scattering (QELS), differential scanning calorimetry (DSC), thermogravimetry (TG), zeta potential measurement, nitrogen sorption, and water vapor and organic dye adsorption are used to comprehensively characterize the pure (TEOS particles) and modified silica particles. The SEM micrographs of the particles demonstrate that the modified particles are spherical with uniform size and shape. The particles modified with aminopropyl groups (APTES particles) show the highest isoelectric point (IEP) and the highest weight loss at 780 °C because of the basic nature of aminopropyl groups and the higher reactivity of aminopropyltriethoxysilane. The particles modified with the phenyl groups (PhTES particles) show the lowest water vapor adsorption because their surface is more hydrophobic than that of TEOS and APTES particles. The organic dye (brilliant blue FCF or BBF) adsorption experiments demonstrate that the adsorption capacity of the particles increases greatly after acidification. This is caused by the protonation of silanol groups and amine groups on the particle surface, which presents an enhanced electrostatic attraction with BBF anions. The APTES particles exhibit the highest dye adsorption due to the hydrophobic attractions and the enhanced electrostatic attractions from aminopropyl groups.

Original languageEnglish
Pages (from-to)119-124
Number of pages6
JournalJournal of Colloid and Interface Science
Volume304
Issue number1
DOIs
Publication statusPublished - 2006 Dec 1

Fingerprint

Silicon Dioxide
Surface properties
Silica
Adsorption
Coloring Agents
Dyes
Steam
Water vapor
Electrostatics
Scanning electron microscopy
Elastic scattering
Acidification
Protonation
Zeta potential
Light scattering
Amines
Anions
Thermogravimetric analysis
Sorption
Differential scanning calorimetry

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

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title = "Surface properties of submicrometer silica spheres modified with aminopropyltriethoxysilane and phenyltriethoxysilane",
abstract = "The surface of submicrometer silica spheres are modified with aminopropyl and phenyl groups through a one-step process. Various experimental techniques, i.e., scanning electron microscopy (SEM), quasi-elastic light scattering (QELS), differential scanning calorimetry (DSC), thermogravimetry (TG), zeta potential measurement, nitrogen sorption, and water vapor and organic dye adsorption are used to comprehensively characterize the pure (TEOS particles) and modified silica particles. The SEM micrographs of the particles demonstrate that the modified particles are spherical with uniform size and shape. The particles modified with aminopropyl groups (APTES particles) show the highest isoelectric point (IEP) and the highest weight loss at 780 °C because of the basic nature of aminopropyl groups and the higher reactivity of aminopropyltriethoxysilane. The particles modified with the phenyl groups (PhTES particles) show the lowest water vapor adsorption because their surface is more hydrophobic than that of TEOS and APTES particles. The organic dye (brilliant blue FCF or BBF) adsorption experiments demonstrate that the adsorption capacity of the particles increases greatly after acidification. This is caused by the protonation of silanol groups and amine groups on the particle surface, which presents an enhanced electrostatic attraction with BBF anions. The APTES particles exhibit the highest dye adsorption due to the hydrophobic attractions and the enhanced electrostatic attractions from aminopropyl groups.",
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Surface properties of submicrometer silica spheres modified with aminopropyltriethoxysilane and phenyltriethoxysilane. / Wu, Zhijian; Xiang, Hong; Kim, Taehoon; Chun, Myung Suk; Lee, Kangtaek.

In: Journal of Colloid and Interface Science, Vol. 304, No. 1, 01.12.2006, p. 119-124.

Research output: Contribution to journalArticle

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