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Optical, Compositional, and Structural Identification and Characterization of Fibrous Zeolites.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Optical, Compositional, and Structural Identification and Characterization of Fibrous Zeolites./
作者:	Pourtabib, Kristina P.
面頁冊數:	1 online resource (148 pages)
附註:	Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
Contained By:	Dissertation Abstracts International78-11B(E).
標題:	Geology. -
電子資源:	click for full text (PQDT)
ISBN:	9780355044867

Optical, Compositional, and Structural Identification and Characterization of Fibrous Zeolites.
Pourtabib, Kristina P.

Optical, Compositional, and Structural Identification and Characterization of Fibrous Zeolites. - 1 online resource (148 pages)

Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

Zeolites are a group of aluminosilicate minerals containing various channel and cage structures that allow for the exchange of cations and H2O. Many of fibrous and/or acicular zeolite samples share similar hand sample characteristics making identification by more detailed means essential. Most of the zeolite minerals can be distinguished based on differences in composition, structure and optics. The two zeolite minerals erionite and offretite contain many overlapping properties that make differentiation problematic at times. Erionite is listed as a Group I carcinogen meaning that it is known to cause cancer in humans and animals alike, although the mechanisms by which erionite induces cancer are still unclear. Conversely, offretite does not possess these carcinogenetic properties. Being able to accurately distinguish erionite from other zeolite species will allow for analytical testing laboratories to develop more accurate means of recognizing erionite in an unknown sample.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355044867Subjects--Topical Terms:

670379
Geology.
Index Terms--Genre/Form:

554714
Electronic books.

Optical, Compositional, and Structural Identification and Characterization of Fibrous Zeolites.
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100 1 $a Pourtabib, Kristina P. $3 1183430
245 1 0 $a Optical, Compositional, and Structural Identification and Characterization of Fibrous Zeolites.
264 0 $c 2017
300 $a 1 online resource (148 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
500 $a Adviser: Mickey E. Gunter.
502 $a Thesis (Ph.D.) $c University of Idaho $d 2017.
504 $a Includes bibliographical references
520 $a Zeolites are a group of aluminosilicate minerals containing various channel and cage structures that allow for the exchange of cations and H2O. Many of fibrous and/or acicular zeolite samples share similar hand sample characteristics making identification by more detailed means essential. Most of the zeolite minerals can be distinguished based on differences in composition, structure and optics. The two zeolite minerals erionite and offretite contain many overlapping properties that make differentiation problematic at times. Erionite is listed as a Group I carcinogen meaning that it is known to cause cancer in humans and animals alike, although the mechanisms by which erionite induces cancer are still unclear. Conversely, offretite does not possess these carcinogenetic properties. Being able to accurately distinguish erionite from other zeolite species will allow for analytical testing laboratories to develop more accurate means of recognizing erionite in an unknown sample.
520 $a The zeolites in this study were analyzed using Electron Probe Microanalysis (EPMA) for composition, Selected Area Electron Diffraction on the Transmission Electron Microscope (SAED, TEM) and Single Crystal X-Ray Diffraction (SCXRD) for structure, and the Spindle Stage for optics. Erionite and offretite both are hexagonal minerals with differing unit cell sizes and space groups. The unique space group symmetry of erionite, P63/ mmc, causes diffraction constraints (i.e. systematic absences) when using SAED on the TEM, while the diffraction pattern of offretite does not show diffraction constraints. Compositionally erionite is more Ca-rich than offretite, which is more Mg-rich, and optically, erionite and offretite have overlapping refractive indices.
520 $a Zeolite minerals are prone to dehydration due to the abundant H 2O in their structure. Dehydration greatly affects the migration of extraframework cations into and out of certain cage and channel structures. Cation migration and the reorientation of H2O molecules can have large influences on the compositional, structural, and optical changes observed in these minerals. Prominent intergrowths, overgrowths, and stacking offsets in erionite and offretite, along with other zeolite minerals, will also directly reflect changes in mineral properties. This study aims to use multiple means of identification to differentiate the fibrous and acicular zeolite species, especially that of erionite and offretite.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Geology. $3 670379
655 7 $a Electronic books. $2 local $3 554714
690 $a 0372
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Idaho. $b Geology. $3 1183431
773 0 $t Dissertation Abstracts International $g 78-11B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10263665 $z click for full text (PQDT)