Synthesis and application of organic thin film modified surfaces.
Item
-
Title
-
Synthesis and application of organic thin film modified surfaces.
-
Identifier
-
AAI3169999
-
identifier
-
3169999
-
Creator
-
Xu, Chang.
-
Contributor
-
Adviser: Charles Michael Drain
-
Date
-
2005
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Chemistry, Polymer | Chemistry, Physical
-
Abstract
-
The theme of this dissertation is surface modification with thin organic films. In particular, this thesis focuses on self-assembled monolayers and polymer brushes, which are elaborated in the introduction. Following the introduction, tribology behaviors of OTE SAMs on a nanometer scale asperity are presented in chapter 2. Despite most tribology study of SAMs based on atomic flat surface, surfaces naturally occurring are rarely flat. Most surfaces in contact are composed of nanometer scale asperities. Interaction between those asperities dominates the tribology behaviors between surfaces. With silica nanoparticles and AFM tips as mimic of asperities, our work provides new insights of how the underlying surface geometries will affect the SAMs tribology behaviors.;The majority of this thesis is focus on surface modification with polymer brushes. Chapter 3 introduces micro-channel confined surface initiated polymerization (muSIP), a versatile method of engineering surface initiated polymerization. muSIP enables the formation of polymer brushes of complex surface structure. Micrometer level polymer brush patterns were generated with muSIP. This method was further exploited to synthesize statistic polymer brushes gradient on surface.;Chapter 4 focuses on the synthesis and characterization of gradient statistical copolymer brushes of MMA and HEMA. Gradient statistical copolymer brushes with gradual increase of HEMA segment concentration from surface was synthesized by gradual addition of HEMA to a MMA polymerization solution. The gradient nature of the polymer brushes is evidenced by the gradual change of surface water contact angle measurement. The solvent responsibility of the gradient polymer brushes was also studied.;A combinatorial approach to study the properties of block copolymer brush is detailed in Chapter 5. A serial of block copolymer brush gradients were synthesized. Base on those gradient substrates, we explored how the thickness of each block affects the solvent responsibility of the polymer brushes.;Chapter 6 expands our research from surface modification and characterization to application. The interaction between surface and porphyrin nanoparticle was studied. It was found that the aggregation behavior of porphyrin on surface in greatly affected by surface energy. The strong interaction between porphyrin nanoparticles and surface results in breaking down and collapse of nanoparticles on hydrophilic surface.
-
Type
-
dissertation
-
Source
-
PQT Legacy CUNY.xlsx
-
degree
-
Ph.D.
