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Flow 1H dynamic nuclear polarization...

Salido, Sandra Irene.

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Flow 1H dynamic nuclear polarization studies in normal liquids and supercritical fluid carbon dioxide.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Flow 1H dynamic nuclear polarization studies in normal liquids and supercritical fluid carbon dioxide./
作者:	Salido, Sandra Irene.
面頁冊數:	71 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0734.
Contained By:	Dissertation Abstracts International64-02B.
標題:	Chemistry, Physical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3082607
ISBN:	0496304585

Flow 1H dynamic nuclear polarization studies in normal liquids and supercritical fluid carbon dioxide.
Salido, Sandra Irene.

Flow 1H dynamic nuclear polarization studies in normal liquids and supercritical fluid carbon dioxide. - 71 p.

Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0734.

Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2003.

Flow 1H dynamic nuclear polarization (DNP) experiments of small probe molecules (i.e. chloroform and benzene) were conducted in normal liquids (i.e. neat benzene, deuterated benzene, chloroform) and supercritical fluid CO2. Initial data collected on the 14N NMR line width of acetonitrile in normal liquids and SF CO2 resulted in a 2--6 factor increase in the molecular motion of the molecule in the SF---the result of which corresponds to the expected factor increase in DNP signal enhancements in the low viscosity fluid. Observed DNP signal enhancements were 2--5 times greater in the supercritical fluid versus the normal liquids in both the solid-liquid intermolecular transfer (SLIT) and liquid-liquid intermolecular transfer (LLIT) experiments. Significant changes in the electron spin-spin (T1S) and spin-lattice (T 2S) relaxation times of the nitroxide radical TEMPO in neat benzene, deuterated benzene, and SF CO2 were noted; the T1ST 2S product (calculated from DNP saturation plots) of the LLIT DNP data were compared.

ISBN: 0496304585Subjects--Topical Terms:

560527
Chemistry, Physical.

Flow 1H dynamic nuclear polarization studies in normal liquids and supercritical fluid carbon dioxide.
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245 1 0 $a Flow 1H dynamic nuclear polarization studies in normal liquids and supercritical fluid carbon dioxide.
300 $a 71 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0734.
500 $a Chair: Harry Dorn.
502 $a Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2003.
520 $a Flow 1H dynamic nuclear polarization (DNP) experiments of small probe molecules (i.e. chloroform and benzene) were conducted in normal liquids (i.e. neat benzene, deuterated benzene, chloroform) and supercritical fluid CO2. Initial data collected on the 14N NMR line width of acetonitrile in normal liquids and SF CO2 resulted in a 2--6 factor increase in the molecular motion of the molecule in the SF---the result of which corresponds to the expected factor increase in DNP signal enhancements in the low viscosity fluid. Observed DNP signal enhancements were 2--5 times greater in the supercritical fluid versus the normal liquids in both the solid-liquid intermolecular transfer (SLIT) and liquid-liquid intermolecular transfer (LLIT) experiments. Significant changes in the electron spin-spin (T1S) and spin-lattice (T 2S) relaxation times of the nitroxide radical TEMPO in neat benzene, deuterated benzene, and SF CO2 were noted; the T1ST 2S product (calculated from DNP saturation plots) of the LLIT DNP data were compared.
520 $a Due to the high pressures and elevated temperatures necessary for optimum flow DNP with SF CO2 (e.g. P = 2310 psi, T = 313 K), high pressure flow cells were developed (and, also, adapted to a commercially available probe in the NMR regime) using PEEK (polyetheretherketone) material.
590 $a School code: 0247.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Analytical. $3 586156
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773 0 $t Dissertation Abstracts International $g 64-02B.
790 1 0 $a Dorn, Harry, $e advisor
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791 $a Ph.D.
792 $a 2003
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