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Reactivity, modification and adsorpt...

The Johns Hopkins University.

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Reactivity, modification and adsorption properties of carbon based surfaces and thin films.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Reactivity, modification and adsorption properties of carbon based surfaces and thin films./
Author:	Gorham, Justin.
Description:	186 p.
Notes:	Adviser: D. Howard Fairbrother.
Contained By:	Dissertation Abstracts International69-12B.
Subject:	Chemistry, Analytical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3339719
ISBN:	9780549937357

Reactivity, modification and adsorption properties of carbon based surfaces and thin films.
Gorham, Justin.

Reactivity, modification and adsorption properties of carbon based surfaces and thin films. - 186 p.

Adviser: D. Howard Fairbrother.

Thesis (Ph.D.)--The Johns Hopkins University, 2009.

To better understand the role that phosphorous atoms play in protecting polymers under extreme environments, I have studied the surface reactions of carbon-phosphide films exposed to atomic oxygen (AO). Results showed that the film's surface carbon atoms were volatilized during AO exposure, producing a higher concentration of surface phosphorous atoms. Ultimately, a highly oxidized, phosphate surface layer developed that was resistant to further AO-mediated erosion below 500 K.

ISBN: 9780549937357Subjects--Topical Terms:

586156
Chemistry, Analytical.

Reactivity, modification and adsorption properties of carbon based surfaces and thin films.
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020 $a 9780549937357
035 $a (UMI)AAI3339719
035 $a AAI3339719
040 $a UMI $c UMI
100 1 $a Gorham, Justin. $3 1030747
245 1 0 $a Reactivity, modification and adsorption properties of carbon based surfaces and thin films.
300 $a 186 p.
500 $a Adviser: D. Howard Fairbrother.
500 $a Source: Dissertation Abstracts International, Volume: 69-12, Section: B, page: 7470.
502 $a Thesis (Ph.D.)--The Johns Hopkins University, 2009.
520 $a To better understand the role that phosphorous atoms play in protecting polymers under extreme environments, I have studied the surface reactions of carbon-phosphide films exposed to atomic oxygen (AO). Results showed that the film's surface carbon atoms were volatilized during AO exposure, producing a higher concentration of surface phosphorous atoms. Ultimately, a highly oxidized, phosphate surface layer developed that was resistant to further AO-mediated erosion below 500 K.
520 $a Atomic hydrogen (AH) is a ubiquitous component of plasma reactors, but its surface reactions with organic films are poorly understood. To better understand AH mediated surface processes, I investigated its reactivity towards two types of self-assembled monolayers (SAMs): alkanethiolate SAMs and semi-fluorinated SAMs (CF-SAMs). AH reactions with alkanethiolate SAMs (CH3(CH 2)nS-Au) adsorbed on Au were studied as a function chain length, and results from these studies highlighted the role that film thickness plays in thin film modification. For example, with short-chain SAMs (n=8,11) the sulfur and carbon atoms desorbed at the same rate indicating complete chain removal upon AH exposure. However, with long-chain SAMs (n=15,17) AH diffusion rates to the film-substrate interface were slower, and the loss of carbon and sulfur was uncorrelated. AH reactions with CF-SAMs adsorbed on SiO2 (CF3(CF2)7(CH2)Si&equiv;) were markedly different than those observed for alkanethiolates. Initially, AH abstracts a hydrogen atom from a C-H bond forming a carbon-centered radical. Subsequent reactions of these radicals with AH led to desorption of the CF-SAM's fluorocarbon component (CF3(CF2)5). By controlling the surface concentration of C-F species with AH, the CF-SAM's wettability could be tuned over a wide range of values.
520 $a To model the effects of naturally occurring macromolecules on activated carbon in aquatic environments, I have used AFM to characterize the adsorption of natural organic matter (NOM) onto highly ordered pyrolytic graphite (HOPG). NOM adsorption increased under acidic conditions and increasing electrolyte concentration. These results indicated that reduced electrostatic repulsions between NOM macromolecules increased aggregation onto HOPG. The presence of Ca2+ was particularly effective in increasing NOM surface adsorption due to its intermolecular complexation capabilities.
590 $a School code: 0098.
650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Chemistry, Physical. $3 560527
690 $a 0486
690 $a 0494
710 2 $a The Johns Hopkins University. $3 1017431
773 0 $t Dissertation Abstracts International $g 69-12B.
790 $a 0098
790 1 0 $a Fairbrother, D. Howard, $e advisor
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3339719