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Single-walled metal oxide nanotubes ...

Kang, Dun-Yen.

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Single-walled metal oxide nanotubes and nanotube membranes for molecular separations.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Single-walled metal oxide nanotubes and nanotube membranes for molecular separations./
Author:	Kang, Dun-Yen.
Description:	177 p.
Notes:	Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.
Contained By:	Dissertation Abstracts International74-03B(E).
Subject:	Chemical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3531736
ISBN:	9781267739872

Single-walled metal oxide nanotubes and nanotube membranes for molecular separations.
Kang, Dun-Yen.

Single-walled metal oxide nanotubes and nanotube membranes for molecular separations. - 177 p.

Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.

Thesis (Ph.D.)--Georgia Institute of Technology, 2012.

Single-walled nanotubes have been considered essential "building-blocks" in nanotechnology and emerging materials for molecular recognition-based applications, such as molecular sensing, catalysis, and separations. Two critical obstacles in the development of functional nanotube-based devices are: (a) the difficulty of creating diverse functionality at the interior surfaces of single-walled nanotubes, and (b) the lack of effective approaches for fabricating scalable technological platforms with nanotube materials. This thesis describes my work addressing key fundamental issues in nanotube science and technology; particularly regarding the synthesis, characterization, and functionalization of single-walled metal oxide nanotubes (SWNTs) (Chapters 2, 3, 4),and approaches for applying SWNTs in scalable separation platforms for potentially achieving high performance (Chapters 5, 6, 7).

ISBN: 9781267739872Subjects--Topical Terms:

560457
Chemical engineering.

Single-walled metal oxide nanotubes and nanotube membranes for molecular separations.
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100 1 $a Kang, Dun-Yen. $3 3186467
245 1 0 $a Single-walled metal oxide nanotubes and nanotube membranes for molecular separations.
300 $a 177 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.
500 $a Advisers: Sankar Nair; Christopher W. Jones.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2012.
520 $a Single-walled nanotubes have been considered essential "building-blocks" in nanotechnology and emerging materials for molecular recognition-based applications, such as molecular sensing, catalysis, and separations. Two critical obstacles in the development of functional nanotube-based devices are: (a) the difficulty of creating diverse functionality at the interior surfaces of single-walled nanotubes, and (b) the lack of effective approaches for fabricating scalable technological platforms with nanotube materials. This thesis describes my work addressing key fundamental issues in nanotube science and technology; particularly regarding the synthesis, characterization, and functionalization of single-walled metal oxide nanotubes (SWNTs) (Chapters 2, 3, 4),and approaches for applying SWNTs in scalable separation platforms for potentially achieving high performance (Chapters 5, 6, 7).
520 $a The above, rather ambitious, objectives were addressed in a step-wise manner in this work. First, I acquired a detailed fundamental understanding of the inner surface properties of aluminosilicate SWNTs (Chapter 2). The investigations included elucidating molecular level details of dehydration and dehydroxylation phenomena in aluminosilicate single-walled nanotubes with a combination of several temperature-dependent solid-state characterization techniques. Critical information from this study enables a number of subsequent processes such as interior modification, molecular transport, and controlled delivery of molecules.
520 $a In Chapter 3, a successful post-synthesis interior functionalization methodology is discussed, with the appropriately dehydrated or dehydroxylated nanotubes as the starting materials. Through surface reactions involving organosilane precursors and the inner wall of the nanotube, diverse organic entities can be immobilized at the inner surface of aluminosilicate nanotubes and thereby the hydrophilicity and interior surface properties can be tailored. This study was the first unambiguous demonstration of covalent modification of the interior of single-walled nanotube materials.
520 $a The investigations in Chapter 4 reveal a direct (in situ) route for synthesizing organic-functionalized alumino-silicate nanotubes via the use of organosilanes with functional groups in the synthesis itself (as opposed to post-synthesis modification). This work creates a one-step route for the incorporation of functional groups at the interior of nanotubes, thus bypassing the limitations of the low functional group loading as well as additional processing steps in the post-synthesis functionalization methodology of Chapter 3. The two functionalization methods developed (post-synthesis and direct functionalization) together may enable a range of applications of nanotube materials, including separations, catalysis, and molecular capture/encapsulation/storage.
520 $a The direction of the work then turned to the fabrication of nanotube-containing membranes. In view of the absence of a good predictive model for the performance of nanotube-containing membranes, Chapter 5 describes the development of analytical models for quantitatively predicting the separation properties of composite membranes containing (nano)tubular fillers.
520 $a These models provide useful guidance for evaluating/optimizing existing nanotube-based membranes as well as preparing nanotube-based membranes with novel device architectures and enhanced separation performance.
520 $a In Chapter 6, the fabrication and characterization of free-standing nanotube/ polymer composite membranes with good organic-inorganic interface adhesion and good nanotube dispersion is discussed. A detailed investigation of the structure and propreties of these membranes (at nano-, micro-, and macro- length scales) is presented. It is shown that hese nanocomposite membranes could be effectively used to construct scalable membrane separation devices. This work is the first demonstration of a defect-free membrane containing well-dispersed nanotube materials. Molecular level insights on the morphological changes of polymer chains due to nanotube incorporation have also been carefully investigated.
520 $a In order to further develop nanotube membranes of potential technological interest, Chapter 7 presents the development of prototype thin supported composite membranes (< 500 nm) with bare and amine-functionalized nanotubes, and a preliminary evaluation of their CO2/CH4 separation performance. A significant improvement (nearly one order of magnitude) of membrane permeance and slightly enhanced CO2/CH4 selectivity (with incorporation of amine-functionalized nanotubes) was observed. Although this prototype thin membrane is far from being optimized, an important finding is that the observed performance enhancement is likely due to a portion of incorporated nanotubes spanning across the membranes, thereby providing direct mass transport pathways for molecules. This study is, for the first time, a demonstration that functional nanotube materials can be incorporated in scalable thin film/membrane platforms and act as molecular transport channels through the thin film.
520 $a Chapter 8 presents my conclusions and a brief discussion of potential directions for future research.
590 $a School code: 0078.
650 4 $a Chemical engineering. $3 560457
650 4 $a Inorganic chemistry. $3 3173556
650 4 $a Materials science. $3 543314
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710 2 $a Georgia Institute of Technology. $3 696730
773 0 $t Dissertation Abstracts International $g 74-03B(E).
790 $a 0078
791 $a Ph.D.
792 $a 2012
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3531736