SURFACE CHARACTERIZATION OF COATED POWDERS - AL2O3-SIO2-COATED TIO2

被引:21
作者
JOHANSSON, LS [1 ]
LOSOI, T [1 ]
机构
[1] KEMIRA OY VUORIKEMIA,SF-28840 PORI,FINLAND
关键词
D O I
10.1002/sia.740170503
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The aim of this study has been to find experimental strategies to characterize surface structures of coated powders. We have studied hydrous alumina + silica-coated TiO2 pigments using different XPS methods, isoelectric points (ieps) and x-ray fluorescence (XRF). We tested especially the applicability of a simple XPS analysis method introduced by Tougaard et al. Coated TiO2 powders were analysed qualitatively with ieps, XPS surface concentrations, XPS depth profiling, and Ti 2p photoemission peak-to-background ratio D. The ratio D, together with surface concentrations, was found to characterize well the quality of the coating. Differences in surface layers were affirmed also by ieps and XPS profiling. The asymptotic value of D for uncoated, uncontaminated TiO2 powder, interpolated from qualitative results, was approximately 25 eV. This is within 25% of the predicted universal constant (25.2 eV) for transition metals and alloys. Coating layer thicknesses were calculated from XRF and XPS data, the latter assuming an exponential attenuation model with superfical carbon. Based on the value of D, Ti 2p photoelectron mean path lengths (R) also were calculated from the experimental equation by Tougaard. We found good correlation between the results from conventional XPS layer calculations and the Tougaard equation. The methods are independent of each other. Together, they seemed to give more reliable information on the non-ideal powder surfaces studied than either of the methods alone.
引用
收藏
页码:230 / 236
页数:7
相关论文
共 22 条
  • [1] BLAKEY DC, 1988, ANTIBODY IMMUNOCONJ, V1, P1
  • [2] BRIGGS D, 1983, PRACTICAL SURFACE AN
  • [3] PRECIPITATION OF ALUMINOSILICATES ON THE SURFACE OF TITANIUM-DIOXIDE
    BRUNI, M
    VISCA, M
    GARBASSI, F
    MELLOCERESA, E
    [J]. INDUSTRIAL & ENGINEERING CHEMISTRY PRODUCT RESEARCH AND DEVELOPMENT, 1985, 24 (04): : 579 - 586
  • [4] CROSS YM, 1979, SURF INTERFACE ANAL, V1, P1
  • [5] SURFACE STUDIES OF TIO2 PIGMENT WITH ESPECIAL REFERENCE TO THE ROLE OF COATINGS
    DAY, RE
    EGERTON, TA
    [J]. COLLOIDS AND SURFACES, 1987, 23 (1-2): : 137 - 155
  • [6] DREILING MJ, 1978, SURF SCI, V71, P231, DOI 10.1016/0039-6028(78)90330-8
  • [7] XPS ANALYSIS OF UNCOATED AND SILICA-COATED TITANIUM-DIOXIDE POWDERS
    EGERTON, TA
    PARFITT, GD
    KANG, Y
    WIGHTMAN, JP
    [J]. COLLOIDS AND SURFACES, 1983, 7 (04): : 311 - 323
  • [8] ACID SITES TITRATION AND XPS ANALYSIS OF TIO2 PIGMENTS
    FISICARO, E
    VISCA, M
    GARBASSI, F
    CERESA, EM
    [J]. COLLOIDS AND SURFACES, 1981, 3 (03): : 209 - 219
  • [9] QUANTITATION OF COVERAGES ON ROUGH SURFACES BY XPS - AN OVERVIEW
    FULGHUM, JE
    LINTON, RW
    [J]. SURFACE AND INTERFACE ANALYSIS, 1988, 13 (04) : 186 - 192
  • [10] EVALUATION OF XPS FOR THE QUANTITATIVE-DETERMINATION OF SURFACE COVERAGES - FLUORIDE ADSORPTION ON HYDROUS FERRIC-OXIDE PARTICLES
    FULGHUM, JE
    LINTON, RW
    [J]. JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 1989, 49 (02) : 101 - 118