Adsorption of gelatins on surfactant-free PS nanoparticles

被引:18
作者
Hu, TJ
Gao, J
Auweter, H
Iden, R
Lueddecke, E
Wu, C [1 ]
机构
[1] Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China
[2] Univ Sci & Technol China, Dept Chem Phys, Open Lab Bond Select Chem, Anhua 230026, Peoples R China
[3] BASF AG, Dept Fine Chem, Ludwigshafen, Rhine, Germany
关键词
gelatins; adsorption; nanoparticles;
D O I
10.1016/S0032-3861(02)00353-1
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The adsorption of gelatin chains on polystyrene (PS) latex nanoparticles was investigated by a combination of static and dynamic laser light scattering (LLS). The average mass of gelatin adsorbed on each nanoparticle (m(adsorbed)) was calculated from the absolute scattered intensity, while the hydrodynamic volume (V-shell) of the adsorbed gelatin layer was obtained by dynamic LLS. In pure water, due to long-range electrostatic interaction, gelatin can act as stabilizer or flocculants, depending on the length, type and concentration of gelatin chains used. We found that in pure water, V-shell proportional to m(adsorbed); while in 2 wt% formamide aqueous solution, V-shell proportional to (m(adsorbed))(2), indicating the shifting 2 of the dominate interaction from electrostatic to hydrophobic. The adsorption was saturated at similar to 2 mg/m, nearly independent of pH and temperature. For a saturated adsorption, V-shell increases as the gelatin chain length increases. Our results indicate that the B-type gelatin with a lower molar mass and the pH range 7-9 are better choices for the stabilization of the nanoparticles in pure water. (C) 2002 Elsevier Science Ltd All rights reserved.
引用
收藏
页码:5545 / 5550
页数:6
相关论文
共 41 条
[11]   ADSORPTION OF GELATIN TO SILVER BROMIDE SOL [J].
CURME, HG ;
NATALE, CC .
JOURNAL OF PHYSICAL CHEMISTRY, 1964, 68 (10) :3009-&
[12]   MICROVISCOSITY OF DILUTE LATEX + GELATIN DISPERSIONS DETERMINED BY DYNAMIC LIGHT-SCATTERING [J].
DICKINSON, E ;
LAM, WLK ;
STAINSBY, G .
COLLOID AND POLYMER SCIENCE, 1984, 262 (01) :51-55
[13]  
Gao J, 1999, CHINESE J POLYM SCI, V17, P595
[14]   The ''coil-to-globule'' transition of poly(N-isopropylacrylamide) on the surface of a surfactant-free polystyrene nanoparticle [J].
Gao, J ;
Wu, C .
MACROMOLECULES, 1997, 30 (22) :6873-6876
[15]  
Griffith PC, 1996, LANGMUIR, V12, P2884
[16]   PROBING BIOPOLYMERS WITH SCANNING FORCE METHODS - ADSORPTION, STRUCTURE, PROPERTIES, AND TRANSFORMATION OF GELATIN ON MICA [J].
HAUGSTAD, G ;
GLADFELTER, WL .
LANGMUIR, 1994, 10 (11) :4295-4306
[17]  
HELGA B, 1954, J PHYS CHEM-US, V58, P968
[18]   EFFECT OF PH AND SALT ON THE ADSORPTION AND INTERACTIONS OF AN AMPHOTERIC POLYELECTROLYTE [J].
KAMIYAMA, Y ;
ISRAELACHVILI, J .
MACROMOLECULES, 1992, 25 (19) :5081-5088
[19]   MEASUREMENT OF THE INTERACTION BETWEEN ADSORBED POLYELECTROLYTES - GELATIN ON MICA SURFACES [J].
KAWANISHI, N ;
CHRISTENSON, HK ;
NINHAM, BW .
JOURNAL OF PHYSICAL CHEMISTRY, 1990, 94 (11) :4611-4617
[20]  
KUDISH AT, 1987, ACS SYM SER, V343, P261