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Surface reactions and segregation in...

Strong, John A.

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Surface reactions and segregation in Langmuir-Blodgett monolayers and bilayers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Surface reactions and segregation in Langmuir-Blodgett monolayers and bilayers./
作者:	Strong, John A.
面頁冊數:	510 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5499.
Contained By:	Dissertation Abstracts International64-11B.
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3113531
ISBN:	049661024X

Surface reactions and segregation in Langmuir-Blodgett monolayers and bilayers.
Strong, John A.

Surface reactions and segregation in Langmuir-Blodgett monolayers and bilayers. - 510 p.

Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5499.

Thesis (Ph.D.)--State University of New York at Buffalo, 2004.

This dissertation summarizes two research projects investigating major aspects of the behavior of the surfaces of thin films. The first project concerned the segregation to the air interface of a Langmiur-Blodgett monolayer of low surface energy poky (dimethyl-siloxane) through a dense L-B overlayer of higher surface energy poly(methyl-methacrylate). It was found that the longer chains of PDMS were over-represented at the air interface and that, therefore, enthalpy predominates as the driving force for surface segregation in this system. Entropy would have favored an over-represerntation of shorter PDMS chains at the air interface. The second project investigated the effects of aging, both in air and in vacuum, on L-B films of the fatty alcohols tetradecanol, oetadecanol and eicosanol. Of particular interest were the products of reaction of the films with oxygen (i.e. a fatty acid) and sulfur, which could be obtained either from the lab atmosphere or as a contaminant already present on the silver substrate. The cleaning procedure for the silver mirror substrates resulted in a surface that was much rougher than in previous work, which complicated comparisons, and resulted in very rapid reaction of the films with oxygen and sulfur due to the disorder in the films caused by the underlying roughness. These reactions were sufficiently rapid that quantification of the reaction rates was, unfortunately, not possible.

ISBN: 049661024XSubjects--Topical Terms:

586156
Chemistry, Analytical.

Surface reactions and segregation in Langmuir-Blodgett monolayers and bilayers.
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502 $a Thesis (Ph.D.)--State University of New York at Buffalo, 2004.
520 $a This dissertation summarizes two research projects investigating major aspects of the behavior of the surfaces of thin films. The first project concerned the segregation to the air interface of a Langmiur-Blodgett monolayer of low surface energy poky (dimethyl-siloxane) through a dense L-B overlayer of higher surface energy poly(methyl-methacrylate). It was found that the longer chains of PDMS were over-represented at the air interface and that, therefore, enthalpy predominates as the driving force for surface segregation in this system. Entropy would have favored an over-represerntation of shorter PDMS chains at the air interface. The second project investigated the effects of aging, both in air and in vacuum, on L-B films of the fatty alcohols tetradecanol, oetadecanol and eicosanol. Of particular interest were the products of reaction of the films with oxygen (i.e. a fatty acid) and sulfur, which could be obtained either from the lab atmosphere or as a contaminant already present on the silver substrate. The cleaning procedure for the silver mirror substrates resulted in a surface that was much rougher than in previous work, which complicated comparisons, and resulted in very rapid reaction of the films with oxygen and sulfur due to the disorder in the films caused by the underlying roughness. These reactions were sufficiently rapid that quantification of the reaction rates was, unfortunately, not possible.
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