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Surface composition and orientation ...

Law, George.

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Surface composition and orientation of room temperature ionic liquids.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Surface composition and orientation of room temperature ionic liquids./
Author:	Law, George.
Description:	142 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0760.
Contained By:	Dissertation Abstracts International65-02B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3120768
ISBN:	0496681230

Surface composition and orientation of room temperature ionic liquids.
Law, George.

Surface composition and orientation of room temperature ionic liquids. - 142 p.

Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0760.

Thesis (Ph.D.)--Oregon State University, 2004.

In this thesis, we investigated the surface composition and orientation of both pure room-temperature ionic liquids (Ils) and binary mixtures of the ILs of the type consisting of the 1-alkyl-3-methylimidazolium ([C nmim]+, n = 4, 8, and 12) cation coupled with either [PF6]-, [BF4]-, [Cl]-, or [Br]-. The surfaces of the ILs were examined using both direct recoil spectrometry (DRS) and surface tension measurements. With DRS, a spectral signal produced by a recoiled surface atom indicates the existence of a particular molecular or ionic species at the interface. Derived from the signal are the atomic ratios, which are strongly dependent on the surface orientation of the surface species. The DRS findings are complimented with surface tension measurements, and the thermodynamics properties (surface enthalpy and entropy) derived from such measurements are related to the surface composition and orientation.

ISBN: 0496681230Subjects--Topical Terms:

560527
Chemistry, Physical.

Surface composition and orientation of room temperature ionic liquids.
LDR:02427nmm 2200289 4500 001 1847698
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020 $a 0496681230
035 $a (UnM)AAI3120768
035 $a AAI3120768
040 $a UnM $c UnM
100 1 $a Law, George. $3 1935732
245 1 0 $a Surface composition and orientation of room temperature ionic liquids.
300 $a 142 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0760.
500 $a Adviser: Philip R. Watson.
502 $a Thesis (Ph.D.)--Oregon State University, 2004.
520 $a In this thesis, we investigated the surface composition and orientation of both pure room-temperature ionic liquids (Ils) and binary mixtures of the ILs of the type consisting of the 1-alkyl-3-methylimidazolium ([C nmim]+, n = 4, 8, and 12) cation coupled with either [PF6]-, [BF4]-, [Cl]-, or [Br]-. The surfaces of the ILs were examined using both direct recoil spectrometry (DRS) and surface tension measurements. With DRS, a spectral signal produced by a recoiled surface atom indicates the existence of a particular molecular or ionic species at the interface. Derived from the signal are the atomic ratios, which are strongly dependent on the surface orientation of the surface species. The DRS findings are complimented with surface tension measurements, and the thermodynamics properties (surface enthalpy and entropy) derived from such measurements are related to the surface composition and orientation.
520 $a From the experiments on the neat ILs, the surface compositions of the imidazolium-based ILs were determined. Furthermore, the effects of systematic variations of the cation size (the length of the 1-alkyl chain) and anion identity on the surface orientation of the organic cation were also examined.
520 $a The surfaces of binary mixtures containing &sim;25 mol % of [C12 mim][PF6] or [C12mim][BF4] in [C 4mim][BF4] were also investigated. The DRS and surface tension data of the mixtures were compared to those of the pure components to determine the composition and any changes in the orientations of the cations upon mixing.
590 $a School code: 0172.
650 4 $a Chemistry, Physical. $3 560527
690 $a 0494
710 2 0 $a Oregon State University. $3 625720
773 0 $t Dissertation Abstracts International $g 65-02B.
790 1 0 $a Watson, Philip R., $e advisor
790 $a 0172
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3120768