title: Atomic force microscopy images of lyotropic lamellar phases.
abstract: For the very first time, atomic force microscope images of lamellar phases were observed combined with a freeze fracture technique that does not involve the use of replicas. Samples are rapidly frozen, fractured, and scanned directly with atomic force microscopy, at liquid nitrogen temperature and in high vacuum. This procedure can be used to investigate micro-structured liquids. The lamellar phases in Sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/water and in C12E5/water systems were used to asses this new technique. Our observations were compared with x-ray diffraction measurements and with other freeze fracture methods reported in the literature. Our results show that this technique is useful to image lyotropic lamellar phases and the estimated repeat distances for lamellar periodicity are consistent with those obtained by x-ray diffraction.
authors.affiliation: Instituto de Física, Universidad Nacional Autonoma de Mexico, P.O. Box 20-364, D. F. México, 01000 México.
authors.forename: C
authors.initials: C
authors.lastname: Garza
authors.forename: L T
authors.initials: LT
authors.lastname: Thieghi
authors.forename: R
authors.initials: R
authors.lastname: Castillo
mesh_terms: D004143:Dioctyl Sulfosuccinic Acid / Q000737:chemistry*; D004987:Ethers / Q000737:chemistry*; D005615:Freezing; D018625:Microscopy, Atomic Force / Q000295:instrumentation / Q000379:methods*; D011092:Polyethylene Glycols / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D004987:Ethers; D014867:Water; D004143:Dioctyl Sulfosuccinic Acid; C077053:pentaethylene glycol monododecyl ether; D011092:Polyethylene Glycols