Journal
LANGMUIR
Volume 28, Issue 10, Pages 4614-4617Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la204985d
Keywords
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Funding
- Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-FG02-05ER15720]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0923370] Funding Source: National Science Foundation
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Polymeric surfactants were prepared by quaternization of poly(4-chloromethylstyrene) with N,N-dimethyl-N-n-dodecylamine and N,N-dimethyl-N-n-octylamine to give 1 and 2, respectively. Each of these polymers formed stable monolayers at the air/water interface. Injection of poly(acrylic acid) (PAA) beneath the surface of these films led to a substantial increase in their cohesiveness (i.e., gluing), as evidenced by a dramatic increase in their surface viscosity. Examination of monolayers of 1 by atomic force microscopy, after being transferred to silicon wafers that were surface-modified with n-octadecyltrichlorosilane, showed that the presence of PAA leads to intact film. In contrast, transfer of unglued monolayers resulted in poor coverage. Comparison of the barrier properties of single glued and unglued LB bilayers formed in the presence and in the absence of PAA have shown that PAA minimizes defect formation within these ultrathin assemblies.
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