Properties of surface-modified colloidal particles

被引:0
|
作者
Joan M. Breiner
Michael A. Anderson
Harry W. K. Tom
Robert C. Graham
机构
[1] University of California,Department of Environmental Sciences
[2] University of California,Department of Physics
来源
Clays and Clay Minerals | 2006年 / 54卷
关键词
Contact Angle; Hydrophobic Surface; Kaolinite; Montmorillonite; Pyrophyllite; Quartz; Trimethylchlorosilane;
D O I
暂无
中图分类号
学科分类号
摘要
The reactivity of colloidal particles is regulated by their surface properties. These properties affect the wettability, flocculation-dispersion characteristics, ion exchange, sorption capacities and transport of inorganic colloids. Most studies have focused on hydrophilic, charged-particle surfaces, often ignoring the alterations in surface properties produced by the adsorption of natural organic matter, surfactants and other compounds. Adsorption of these substances can potentially render a surface substantially more hydrophobic. Nevertheless, comparatively little is known about changes in surface properties and reactivity of minerals upon sorption of hydrophobic organic compounds. In this study, the properties of four minerals (kaolinite, pyrophyllite, montmorillonite and Min-U-Sil®) and two inorganic materials (X-ray amorphous Al hydroxide and X-ray amorphous Si oxide) were compared before and after treatment with the common silylating agent, trimethylchlorosilane (TMCS). The samples were characterized by measurements of total carbon, cation exchange capacity (CEC), particle size, specific surface area (SSA), electrophoretic mobility, contact angle, particle aggregation, and by X-ray diffraction and diffuse reflectance infrared spectroscopy. For the layer silicates, surface coverage was limited to ∼2% trimethyl silane (TMSi). TMSi covered 7.5% of the Min-U-Sil® surface and 33% of the X-ray amorphous Si oxide. Treatment did not affect the structure of the minerals but reduced the CEC, SSA and electrophoretic mobilities. Water contact angles increased to between 18 and 114° with treatment. While the apolar characteristic of the surfaces decreased minimally with treatment, the Lewis acid/base properties were substantially reduced and interfacial free energy shifted from positive to negative values indicating a more hydrophobic surface character. For all the samples except kaolinite, these changes affected the stability of the colloids in suspension depending upon solution pH. Although the grafting of TMSi altered colloidal mineral surface properties and increased their hydrophobicity, these changes were not sufficient to predict colloid aggregation behavior.
引用
收藏
页码:12 / 24
页数:12
相关论文
共 50 条
  • [1] Properties of surface-modified colloidal particles
    Breiner, JM
    Anderson, MA
    Tom, HWK
    Graham, RC
    CLAYS AND CLAY MINERALS, 2006, 54 (01) : 12 - 24
  • [2] SURFACE-MODIFIED POLYMER PARTICLES AND FIBERS
    BAUMAN, BD
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1995, 210 : 136 - IEC
  • [3] RHEOLOGICAL PROPERTIES OF NON-MODIFIED AND N-ALKYL SURFACE-MODIFIED COLLOIDAL SILICA SOLS
    LEE, G
    RUPPRECHT, H
    JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1985, 105 (01) : 257 - 266
  • [4] Preparation and Properties of Polylactide Bio-composites with Surface-modified Silica Particles
    Jaikaew, Narisara
    Petchsuk, Atitsa
    Opaprakasit, Pakorn
    CHIANG MAI JOURNAL OF SCIENCE, 2018, 45 (05): : 2059 - 2068
  • [5] Colloidal Crystal Films Consisting of Silica Particles Surface-modified with Polyacrylates Containing Branched Alkyl Chains
    Mishima, Takuya
    Matsuura, Sawa
    Iwata, Naoto
    Furumi, Seiichi
    JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY, 2024, 37 (06) : 573 - 578
  • [6] Microstructure and properties of Cu matrix composites reinforced with surface-modified Kovar particles
    Meng, Tao
    Wang, Ri-chu
    Cat, Zhi-yong
    Yao, Ying-jun
    TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 2024, 34 (10) : 3251 - 3264
  • [7] Stability of colloidal solutions containing various surface-modified cadmium sulfide particles under stationary illumination
    Uchihara, T
    Kamiya, T
    Maedomari, S
    Ganeko, M
    Kinjo, S
    Tamaki, Y
    Kinjo, A
    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2000, 130 (01) : 63 - 69
  • [8] Adsorption of surface-modified colloidal gold particles onto self-assembled monolayers: A model system for the study of interactions of colloidal particles and organic surfaces
    Fan, HY
    Lopez, GP
    LANGMUIR, 1997, 13 (02) : 119 - 121
  • [9] CORROSION PROPERTIES OF SURFACE-MODIFIED MATERIALS
    MELETIS, EI
    HOCHMAN, RF
    JOURNAL OF METALS, 1987, 39 (12): : 25 - 27
  • [10] ANTISTATIC PROPERTIES OF SURFACE-MODIFIED POLYESTERS
    UCHIDA, E
    UYAMA, Y
    IKADA, Y
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1990, 199 : 41 - MACRO