Comparison of colloidal effective charges from different experiments

被引:86
作者
Wette, P [1 ]
Schöpe, HJ [1 ]
Palberg, T [1 ]
机构
[1] Univ Mainz, Inst Phys, KOMET 336, D-55099 Mainz, Germany
关键词
D O I
10.1063/1.1480010
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
We present measurements of effective charges in de-ionized aqueous suspensions of highly charged spherical latex colloids. For crystalline ordered samples the shear modulus G was measured using torsional resonance spectroscopy. It increases with increasing particle number density n. From fits of theoretical expressions based on a Debye-Huckel-type pair interaction potential, an effective charge Z(G)* was derived. On the other hand the effectively transported charge Z(sigma)(*) was determined from the n dependence of the suspension conductivity. Both effective charges are independent of n within experimental error. For most species they scale with the ratio of radius to Bjerrum length. For all species, however, Z(sigma)* is found to be systematically larger than Z(G)* by some 40%. (C) 2002 American Institute of Physics.
引用
收藏
页码:10981 / 10988
页数:8
相关论文
共 53 条
[1]   CHARGE RENORMALIZATION, OSMOTIC-PRESSURE, AND BULK MODULUS OF COLLOIDAL CRYSTALS - THEORY [J].
ALEXANDER, S ;
CHAIKIN, PM ;
GRANT, P ;
MORALES, GJ ;
PINCUS, P ;
HONE, D .
JOURNAL OF CHEMICAL PHYSICS, 1984, 80 (11) :5776-5781
[2]   Ionic condensation and charge renormalization in colloidal suspensions [J].
Belloni, L .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1998, 140 (1-3) :227-243
[3]   Colloidal interactions [J].
Belloni, L .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2000, 12 (46) :R549-R587
[4]   DYNAMICAL TEST OF INTERACTION POTENTIALS FOR COLLOIDAL SUSPENSIONS [J].
BITZER, F ;
PALBERG, T ;
LOWEN, H ;
SIMON, R ;
LEIDERER, P .
PHYSICAL REVIEW E, 1994, 50 (04) :2821-2826
[5]   SMALL-ANGLE NEUTRON-SCATTERING STUDY OF IONIC NONIONIC MIXED MICELLES [J].
BUCCI, S ;
FAGOTTI, C ;
DEGIORGIO, V ;
PIAZZA, R .
LANGMUIR, 1991, 7 (05) :824-826
[6]  
*CECAM, 1999, P CECAM WORKSH EFF I, P28
[7]  
CHAIKIN PM, 1987, PHYSICS COMPLEX SUPE, P65
[8]   When like charges attract: The effects of geometrical confinement on long-range colloidal interactions [J].
Crocker, JC ;
Grier, DG .
PHYSICAL REVIEW LETTERS, 1996, 77 (09) :1897-1900
[9]   Electrophoretic mobility of interacting colloidal spheres [J].
Evers, M ;
Garbow, N ;
Hessinger, D ;
Palberg, T .
PHYSICAL REVIEW E, 1998, 57 (06) :6774-6784
[10]   UNDERSTANDING COLLOIDAL CHARGE RENORMALIZATION FROM SURFACE-CHEMISTRY - EXPERIMENT AND THEORY [J].
GISLER, T ;
SCHULZ, SF ;
BORKOVEC, M ;
STICHER, H ;
SCHURTENBERGER, P ;
DAGUANNO, B ;
KLEIN, R .
JOURNAL OF CHEMICAL PHYSICS, 1994, 101 (11) :9924-9936