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New Effects of Aging and Lattice Intercalation on Surface Properties of Titanate Nanobelts.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	New Effects of Aging and Lattice Intercalation on Surface Properties of Titanate Nanobelts./
作者:	Williams, Roger.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2013,
面頁冊數:	165 p.
附註:	Source: Dissertations Abstracts International, Volume: 74-11, Section: B.
Contained By:	Dissertations Abstracts International74-11B.
標題:	Inorganic chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3559592
ISBN:	9781303048074

New Effects of Aging and Lattice Intercalation on Surface Properties of Titanate Nanobelts.
Williams, Roger.

New Effects of Aging and Lattice Intercalation on Surface Properties of Titanate Nanobelts. - Ann Arbor : ProQuest Dissertations & Theses, 2013 - 165 p.

Source: Dissertations Abstracts International, Volume: 74-11, Section: B.

Thesis (Ph.D.)--University of Arkansas, 2013.

This item must not be added to any third party search indexes.

Titanate nanobelts (NBs) have structural characteristics beyond that of clays. Due to a negatively charged lattice matrix of edge-shared TiO 6-octahedra, the location of intercalated cations within the interlayer space may dictate the charge-conductions. This environment may in turn govern the lattice-framework's stability and surface properties, based upon our preliminary data. On that basis, these nanomaterials have been found in our lab to possess superb biological compatibility that is closely related to the types of the intercalated cations. In addition, a prolonged agitation was proven to enable us to manipulate the titanate NBs' length. In a parallel study, a ripening was observed in the post-synthesis aging process at room temperature (RT). This process implied, for the first time, a new way of changing the NBs' aspect ratio in nanosynthesis. This novel post-synthesis manipulation of aspect ratio has enabled us to successfully improve our yield of the NB-membrane by four folds, which is significant in scale-up fabrication of the NB-entangled membranes, which have shown interest as a proton exchange membrane (PEM) in fuel cells (PEMFC) and gas sensing capabilities. PEMFCs provide the highest power density in comparison with all other fuel cell types currently available. In order to improve the fuel cells efficiency, further advancements into enhancing the thermal stability while maintaining adequate hydration levels of the PEM membrane is continually sought after. Unfortunately, the polymer structure of Nafion© membranes structural stability and water retention falls short at elevated temperatures. However, based on our preliminary data, intercalated titanate NBs/Nafion © composites may hold the key to overcoming these technological drawbacks. Lastly, aging and surface modification of titanate materials has been used to attain the high selectivity and sensitivity in electrochemical sensing when applied to an electrode surface. Our initial findings suggest that the intercalated titanate NBs is ideal for use on an interdigitated electrode surface for direct sensing of relative humidity at different percentages.

ISBN: 9781303048074Subjects--Topical Terms:

3173556
Inorganic chemistry.
Subjects--Index Terms:

Aging

New Effects of Aging and Lattice Intercalation on Surface Properties of Titanate Nanobelts.
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500 $a Source: Dissertations Abstracts International, Volume: 74-11, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Tian, Ryan.
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506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a Titanate nanobelts (NBs) have structural characteristics beyond that of clays. Due to a negatively charged lattice matrix of edge-shared TiO 6-octahedra, the location of intercalated cations within the interlayer space may dictate the charge-conductions. This environment may in turn govern the lattice-framework's stability and surface properties, based upon our preliminary data. On that basis, these nanomaterials have been found in our lab to possess superb biological compatibility that is closely related to the types of the intercalated cations. In addition, a prolonged agitation was proven to enable us to manipulate the titanate NBs' length. In a parallel study, a ripening was observed in the post-synthesis aging process at room temperature (RT). This process implied, for the first time, a new way of changing the NBs' aspect ratio in nanosynthesis. This novel post-synthesis manipulation of aspect ratio has enabled us to successfully improve our yield of the NB-membrane by four folds, which is significant in scale-up fabrication of the NB-entangled membranes, which have shown interest as a proton exchange membrane (PEM) in fuel cells (PEMFC) and gas sensing capabilities. PEMFCs provide the highest power density in comparison with all other fuel cell types currently available. In order to improve the fuel cells efficiency, further advancements into enhancing the thermal stability while maintaining adequate hydration levels of the PEM membrane is continually sought after. Unfortunately, the polymer structure of Nafion© membranes structural stability and water retention falls short at elevated temperatures. However, based on our preliminary data, intercalated titanate NBs/Nafion © composites may hold the key to overcoming these technological drawbacks. Lastly, aging and surface modification of titanate materials has been used to attain the high selectivity and sensitivity in electrochemical sensing when applied to an electrode surface. Our initial findings suggest that the intercalated titanate NBs is ideal for use on an interdigitated electrode surface for direct sensing of relative humidity at different percentages.
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