SELF-ASSEMBLY AND SPREADING OF NONIONIC TRISILOXANE SURFACTANTS

被引:56
作者
TIBERG, F [1 ]
CAZABAT, AM [1 ]
机构
[1] LUND UNIV,S-22101 LUND,SWEDEN
来源
EUROPHYSICS LETTERS | 1994年 / 25卷 / 03期
关键词
D O I
10.1209/0295-5075/25/3/009
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Self-assembly and spreading of ordered structures on solid surfaces is a fundamentally interesting phenomenon, also potentially significant for applications. Here we report on the spreading behaviour of pure trisiloxane oligo(ethylene oxide) surfactants on high- and low-energy surfaces, which in terms of ordering represent two extremes. No specific structure appears as the surfactants spread over a high-energy surface. On low-energy surfaces, however, these surfactants self-assemble into well-defined bilayers. The area covered by the spreading film increases linearly with time, yielding apparent diffusion coefficients that are particularly sensitive to atmospheric humidity. The ability of the surfactant to form bilayers with dense interfacial packing of hydrophobic methyl groups, which enables their spreading over low-energy surfaces, is related to the chemical nature and the geometry of the molecules, while the sensitivity to atmospheric humidity is explained by specific water-ethylene oxide interactions. The conjunction of these properties could be the key feature explaining the <<superspreading>> properties of these ethoxylated trisiloxane surfactants.
引用
收藏
页码:205 / 210
页数:6
相关论文
共 11 条
[1]  
ANANTHAPADADMAN.KP, 1991, COLLOID SURFACE, V44, P281
[2]  
DEGENNES PG, 1990, CR ACAD SCI II, V310, P1601
[3]   THE SPREADING OF LAYERED MICRODROPLETS [J].
FRAYSSE, N ;
VALIGNAT, MP ;
CAZABAT, AM ;
HESLOT, F ;
LEVINSON, P .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1993, 158 (01) :27-32
[4]  
GASKIN RE, 1989, ADJUVANTS AGROCHEMIC, V1, P129
[5]   EXPERIMENTS ON WETTING ON THE SCALE OF NANOMETERS - INFLUENCE OF THE SURFACE-ENERGY [J].
HESLOT, F ;
CAZABAT, AM ;
LEVINSON, P ;
FRAYSSE, N .
PHYSICAL REVIEW LETTERS, 1990, 65 (05) :599-602
[6]  
HILL RM, IN PRESS J PHYS CHGE
[7]   THEORY OF SELF-ASSEMBLY OF HYDROCARBON AMPHIPHILES INTO MICELLES AND BILAYERS [J].
ISRAELACHVILI, JN ;
MITCHELL, DJ ;
NINHAM, BW .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II, 1976, 72 :1525-1568
[8]   PERFORMANCE AND STABILITY OF THE ORGANOSILICONE SURFACTANT L-77 - EFFECT OF PH, CONCENTRATION, AND TEMPERATURE [J].
KNOCHE, M ;
TAMURA, H ;
BUKOVAC, MJ .
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 1991, 39 (01) :202-206
[9]  
ZABKIEWICZ JA, 1989, ADJUVANTS AGROCHEMIC, V1, P141
[10]  
ZHU X, UNPUB COLLOIDS SURF