A coupling model analysis of dynamics of concentrated colloidal suspensions

被引:22
作者
Ngai, KL [1 ]
Rendell, RW [1 ]
机构
[1] USN, Res Lab, Washington, DC 20375 USA
来源
PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES | 1998年 / 77卷 / 02期
关键词
D O I
10.1080/13642819808204989
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Recent dynamic light scattering measurement on concentrated suspensions of 'hard-sphere' colloidal particles by Segre and Pusey (1996, Phys. Rev. Lett., 77, 771) are compared with the theoretical results calculated by the coupling model. The calculated normalized intermediate scattering function decays exponentially at both short and long times, f(Q, short t) proportional to exp[-D-S(Q)Q(2)t] and f(Q, long t) proportional to exp [-D-L(Q)Q(2)t] respectively, with D-L(Q) and D-S(Q) having the same Q dependence. The ratio D-L(Q)/D-S(Q) decreases rapidly with volume fraction phi. At intermediate times, the decay of f(Q, t) is slower and nonexponential, becomes increasing slower and extends to longer times as phi increases. There is good agreement between theory and experiment. It is also pointed out that the diffusional dynamics found in concentrated colloidal suspensions are general and shared by other densely packed interacting systems.
引用
收藏
页码:621 / 631
页数:11
相关论文
共 37 条
  • [1] DYNAMIC LIGHT-SCATTERING STUDY OF CONCENTRATED MICROGEL SOLUTIONS AS MESOSCOPIC MODEL OF THE GLASS-TRANSITION IN QUASI-ATOMIC FLUIDS
    BARTSCH, E
    ANTONIETTI, M
    SCHUPP, W
    SILLESCU, H
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1992, 97 (06) : 3950 - 3963
  • [2] CROSSOVER FROM DEBYE TO NON-DEBYE DYNAMICAL BEHAVIOR OF THE ALPHA-RELAXATION OBSERVED BY QUASI-ELASTIC NEUTRON-SCATTERING IN A GLASS-FORMING POLYMER
    COLMENERO, J
    ARBE, A
    ALEGRIA, A
    [J]. PHYSICAL REVIEW LETTERS, 1993, 71 (16) : 2603 - 2606
  • [3] ION DYNAMICS IN GLASS-FORMING SYSTEMS .2. CONDUCTIVITY SPECTRA ABOVE THE GLASS TRANSFORMATION TEMPERATURE
    CRAMER, C
    FUNKE, K
    BUSCHER, M
    HAPPE, A
    SAATKAMP, T
    WILMER, D
    [J]. PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1995, 71 (04): : 713 - 719
  • [4] ION DYNAMICS IN GLASS-FORMING SYSTEMS .1. CONDUCTIVITY SPECTRA BELOW THE GLASS TRANSFORMATION TEMPERATURE
    CRAMER, C
    FUNKE, K
    SAATKAMP, T
    [J]. PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1995, 71 (04): : 701 - 711
  • [5] FAST AND SLOW DYNAMICS IN THE ONE-DIMENSIONAL PHI-4 LATTICE MODEL - A MOLECULAR-DYNAMICS STUDY
    FLACH, S
    SIEWERT, J
    [J]. PHYSICAL REVIEW B, 1993, 47 (22): : 14910 - 14922
  • [6] SLOW RELAXATION AND PHASE-SPACE PROPERTIES OF A CONSERVATIVE SYSTEM WITH MANY DEGREES OF FREEDOM
    FLACH, S
    MUTSCHKE, G
    [J]. PHYSICAL REVIEW E, 1994, 49 (06): : 5018 - 5024
  • [7] PRIMARY RELAXATION IN A HARD-SPHERE SYSTEM
    FUCHS, M
    HOFACKER, I
    LATZ, A
    [J]. PHYSICAL REVIEW A, 1992, 45 (02): : 898 - 912
  • [8] JUMP RELAXATION MODEL AND COUPLING MODEL - A COMPARISON
    FUNKE, K
    [J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1994, 172 : 1215 - 1221
  • [9] RELAXATION PROCESSES IN SUPERCOOLED LIQUIDS
    GOTZE, W
    SJOGREN, L
    [J]. REPORTS ON PROGRESS IN PHYSICS, 1992, 55 (03) : 241 - 376
  • [10] GRAESSLEY WW, 1982, ADV POLYM SCI, V47, P67