國立虎尾科技大學 |

Self-Assembled Molecular Nanomaterials and Their Applications.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Self-Assembled Molecular Nanomaterials and Their Applications./
Author:	Cho, Yukio.
Description:	1 online resource (159 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
Contained By:	Dissertations Abstracts International85-10B.
Subject:	Chemistry. -
Online resource:	click for full text (PQDT)
ISBN:	9798381958317

Self-Assembled Molecular Nanomaterials and Their Applications.
Cho, Yukio.

Self-Assembled Molecular Nanomaterials and Their Applications. - 1 online resource (159 pages)

Source: Dissertations Abstracts International, Volume: 85-10, Section: B.

Thesis (Ph.D.)--Massachusetts Institute of Technology, 2024.

Includes bibliographical references

Self-assembly of small molecules in water provides a bottom-up strategy to generate highly ordered nanostructures with dimensions on molecular (<10 nm) length scales. However, molecular self-assembled nanomaterials have traditionally been employed mostly in biological applications due to two critical and inherent constraints: 1) The nanostructures lack cohesive interactions for stability outside of an aqueous environment, and 2) Modifying their functionality, often attributes to the surface chemistry of nanostructures, without disturbing molecular packing is challenging. This dissertation explores a new self-assembling platform called "aramid amphiphiles (AAs)". These AAs incorporate hallmark features of Kevlar, the renowned material used in bulletproof vests, to enhance cohesive intermolecular interaction and suppress dynamic motion of constituent molecules. In this study, a spontaneous self-assembly of AAs with various functionalities into one dimensional, high-aspect-ratio AA nanomaterials in water has been observed. These nanomaterials not only exhibit remarkable mechanical strength but also maintain stability outside of an aqueous environment, where the initial driving force of self-assembly is typically absent. Leveraging their mechanical robustness and high aspect-ratios morphologies, these individual nanomaterials can undergo shear alignment to form hierarchically ordered macroscopic material that is mechanically flexible and stable in air. Furthermore, the enhanced intermolecular cohesion also provides an alternative pathway to circumvent the previously mentioned second constraint. This is accomplished through the use of domain-selective thermal decomposition, a process that strategically removes the thermally labile hydrophilic domains while maintaining the thermally stable internal cohesive domain of AA nanomaterials.This dissertation also broadens the potential applications of AA nanomaterials by tailoring the surface chemistry functionality of constituent AAs. For example, the AA nanomaterials can be modified to dissociate lithium salt and exhibit lithium-ion conductivity by incorporating an oligomer form of polyethylene oxide. The resulting AA solid-state membrane, composed of molecular self-assembled nanomaterial, enables a unique feature of reversibility. This feature facilitates easier separation of different components, thus enhancing battery recycling - a technology that is currently economically impractical and technically challenging. Moreover, the AAs can be tailored to self-assemble into high-aspect-ratio, rigid nanotubes with the surface functionality to immobilize metal nanoparticles. The sub-nm diameter metal nanoparticles are highly catalytically active, but they are often not cost-effective to separate from solution due to their size. Assembling these metal nanoparticles onto the AA nanotubes not only maintain the high surface-volume ratio necessary for effective catalysis, but also enables the assemblies to be separated from the solution and reused through a simple filtration process. This dissertation thereby paves the way for using molecular self-assembly to create advanced, nanostructured, solid-state molecular materials.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798381958317Subjects--Topical Terms:

593913
Chemistry.
Subjects--Index Terms:

Molecular nanomaterialsIndex Terms--Genre/Form:

554714
Electronic books.

Self-Assembled Molecular Nanomaterials and Their Applications.
LDR:04618ntm a22003977 4500 001 1146477
005 20240812064625.5
006 m o d
007 cr bn ---uuuuu
008 250605s2024 xx obm 000 0 eng d
020 $a 9798381958317
035 $a (MiAaPQ)AAI31091440
035 $a (MiAaPQ)MIT1721_1_153323
035 $a AAI31091440
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Cho, Yukio. $3 1471869
245 1 0 $a Self-Assembled Molecular Nanomaterials and Their Applications.
264 0 $c 2024
300 $a 1 online resource (159 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
500 $a Advisor: Ortony, Julia H.;Chiang, Yet-Ming.
502 $a Thesis (Ph.D.)--Massachusetts Institute of Technology, 2024.
504 $a Includes bibliographical references
520 $a Self-assembly of small molecules in water provides a bottom-up strategy to generate highly ordered nanostructures with dimensions on molecular (<10 nm) length scales. However, molecular self-assembled nanomaterials have traditionally been employed mostly in biological applications due to two critical and inherent constraints: 1) The nanostructures lack cohesive interactions for stability outside of an aqueous environment, and 2) Modifying their functionality, often attributes to the surface chemistry of nanostructures, without disturbing molecular packing is challenging. This dissertation explores a new self-assembling platform called "aramid amphiphiles (AAs)". These AAs incorporate hallmark features of Kevlar, the renowned material used in bulletproof vests, to enhance cohesive intermolecular interaction and suppress dynamic motion of constituent molecules. In this study, a spontaneous self-assembly of AAs with various functionalities into one dimensional, high-aspect-ratio AA nanomaterials in water has been observed. These nanomaterials not only exhibit remarkable mechanical strength but also maintain stability outside of an aqueous environment, where the initial driving force of self-assembly is typically absent. Leveraging their mechanical robustness and high aspect-ratios morphologies, these individual nanomaterials can undergo shear alignment to form hierarchically ordered macroscopic material that is mechanically flexible and stable in air. Furthermore, the enhanced intermolecular cohesion also provides an alternative pathway to circumvent the previously mentioned second constraint. This is accomplished through the use of domain-selective thermal decomposition, a process that strategically removes the thermally labile hydrophilic domains while maintaining the thermally stable internal cohesive domain of AA nanomaterials.This dissertation also broadens the potential applications of AA nanomaterials by tailoring the surface chemistry functionality of constituent AAs. For example, the AA nanomaterials can be modified to dissociate lithium salt and exhibit lithium-ion conductivity by incorporating an oligomer form of polyethylene oxide. The resulting AA solid-state membrane, composed of molecular self-assembled nanomaterial, enables a unique feature of reversibility. This feature facilitates easier separation of different components, thus enhancing battery recycling - a technology that is currently economically impractical and technically challenging. Moreover, the AAs can be tailored to self-assemble into high-aspect-ratio, rigid nanotubes with the surface functionality to immobilize metal nanoparticles. The sub-nm diameter metal nanoparticles are highly catalytically active, but they are often not cost-effective to separate from solution due to their size. Assembling these metal nanoparticles onto the AA nanotubes not only maintain the high surface-volume ratio necessary for effective catalysis, but also enables the assemblies to be separated from the solution and reused through a simple filtration process. This dissertation thereby paves the way for using molecular self-assembly to create advanced, nanostructured, solid-state molecular materials.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Chemistry. $3 593913
650 4 $a Nanoscience. $3 632473
650 4 $a Molecular chemistry. $3 1179636
653 $a Molecular nanomaterials
653 $a Self-assembly
653 $a Small molecules
653 $a Aramid amphiphiles
655 7 $a Electronic books. $2 local $3 554714
690 $a 0565
690 $a 0431
690 $a 0485
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Massachusetts Institute of Technology. $b Department of Materials Science and Engineering. $3 1471868
773 0 $t Dissertations Abstracts International $g 85-10B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31091440 $z click for full text (PQDT)