TY - JOUR
T1 - Cryo-TEM of thread-like micelles
T2 - On-the-grid microstructural transformations induced during specimen preparation
AU - Danino, Dganit
AU - Talmon, Yeshayahu
AU - Zana, Raoul
N1 - Funding Information:
Thanks are due to Drs S.J. Candau and G. Porte for the gift of the surfactant samples and stimulating discussions. We thank J. Schmidt and B. Shdemati for expert technical assistance. R.Z. thanks the Mission des Relations Internationales (CNRS, France) for partial financing of his stay at the Technion. The last stages of the work were performed at the Hannah and George Krumholz Cryo-TEM Laboratory. The work at the Technion was supported by the Israel Science Foundation of the Israel Academy of Science and Humanities.
PY - 2000/9
Y1 - 2000/9
N2 - This paper reports a transmission electron microscopy at cryogenic temperature (cryo-TEM) study of the microstructure of aqueous solutions of hexadecylpyridinium chlorate (CPClO3) in the presence of sodium chlorate. Micrographs showed very crumpled bilayer fragments with many creases, coexisting with spheroidal and thread-like micelles, instead of the threadlike micelles expected from previous neutron and light scattering studies of this system. This shows that shear during specimen preparation for cryo-TEM may affect the microstructure of some investigated systems. With the CPClO3/NaClO3 system the shearing of the sample associated to its blotting apparently induces a transformation of the thread-like micelles into bilayer fragments. Other transformations may be also possible in view of the results reported for other systems. However, it is noteworthy that changes of microstructure such as the ones discussed in this paper have been observed only in a relatively small number of the systems investigated by cryo-TEM. Beyond the implications for cryo-TEM, our findings are direct manifestations of shear-induced changes in surfactant solution microstructure.
AB - This paper reports a transmission electron microscopy at cryogenic temperature (cryo-TEM) study of the microstructure of aqueous solutions of hexadecylpyridinium chlorate (CPClO3) in the presence of sodium chlorate. Micrographs showed very crumpled bilayer fragments with many creases, coexisting with spheroidal and thread-like micelles, instead of the threadlike micelles expected from previous neutron and light scattering studies of this system. This shows that shear during specimen preparation for cryo-TEM may affect the microstructure of some investigated systems. With the CPClO3/NaClO3 system the shearing of the sample associated to its blotting apparently induces a transformation of the thread-like micelles into bilayer fragments. Other transformations may be also possible in view of the results reported for other systems. However, it is noteworthy that changes of microstructure such as the ones discussed in this paper have been observed only in a relatively small number of the systems investigated by cryo-TEM. Beyond the implications for cryo-TEM, our findings are direct manifestations of shear-induced changes in surfactant solution microstructure.
KW - Cryo-TEM
KW - Microstructural transformations
KW - Thread like micelles
UR - http://www.scopus.com/inward/record.url?scp=0034002963&partnerID=8YFLogxK
U2 - 10.1016/S0927-7757(00)00418-0
DO - 10.1016/S0927-7757(00)00418-0
M3 - 文章
AN - SCOPUS:0034002963
SN - 0927-7757
VL - 169
SP - 67
EP - 73
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
IS - 1-3
ER -