東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Linked to FindBook

Google Book

Amazon

博客來

Direct, Additive-Free Processing of Carbon Nanotubes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Direct, Additive-Free Processing of Carbon Nanotubes./
Author:	Chiou, Kevin.
Description:	1 online resource (93 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 82-01, Section: B.
Contained By:	Dissertations Abstracts International82-01B.
Subject:	Nanoscience. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27993401click for full text (PQDT)
ISBN:	9798658369716

Direct, Additive-Free Processing of Carbon Nanotubes.
Chiou, Kevin.

Direct, Additive-Free Processing of Carbon Nanotubes. - 1 online resource (93 pages)

Source: Dissertations Abstracts International, Volume: 82-01, Section: B.

Thesis (Ph.D.)--Northwestern University, 2020.

Includes bibliographical references

Carbon nanotubes (CNTs) have exceptional properties and are mass-producible at the ton scale as aggregated powders, but their difficulty in processing is a significant barrier to widespread use. Even after decades of research, there still isn't a solvent for CNTs that is massively available, easily removable, and non-damaging. The need for an effective solvent highlights the impact of my discovery that cresols, a group of naturally occurring and mass-produced methylphenols, are unexpectedly effective solvents for CNTs. They can homogenize CNTs up to tens of weight percent, without additional dispersing agents or nanotube functionalization. The outstanding processability comes from cresols' charge-transfer complexation capability between the phenolic hydroxyl groups and the aromatic surface of CNT, which separates CNTs and stabilize the solution. Since charge-transfer interactions are electrostatic in nature, the complexes are stable against solvents with low dielectric constants. When these solvents dilute dispersion of nanotubes in m-Cresol, the complexes stay stable and keeps m-cresol attracted to nanotubes' aromatic surface. Affinity of m-cresol to CNT assists the initial disentanglement of nanotube aggregates, and complexed solvent molecules help to keep CNT stable in dispersion.In a good solvent, separated nanotubes become outstretched like dissolved polymer molecules. This nanotube mixture displays viscoelastic properties typical of polymer solutions. With increasing CNT concentrations, nanotube mixtures can continuously transition between dilute dispersions, thick pastes, free-standing gels, and kneadable, playdough-like materials. These four highly processible states are immediately usable for different processing techniques such as Langmuir-Blodgett film assembly, blade coating, air-spray coating, 3D printing, and sculpting. In addition to being a solvent for CNT, m-cresol demonstrates that simple phenols can process various conjugated carbon nanomaterials. This concept was demonstrated by dispersing CNT with the aid of either 3,4-xylenol or vanillin. m-Cresol also disperses Carbon black and graphite, and this shows that various carbon nanomaterials behave similarly in complexing with phenols. These proofs of concepts demonstrate that carbon nanomaterials can be made more accessible by using phenols as processing aids and adapting existing equipment to process these nanomaterials.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798658369716Subjects--Topical Terms:

587832
Nanoscience.
Subjects--Index Terms:

Carbon nanotubeIndex Terms--Genre/Form:

542853
Electronic books.

Direct, Additive-Free Processing of Carbon Nanotubes.
LDR:03673nmm a2200361K 4500 001 2357517
005 20230725053501.5
006 m o d
007 cr mn ---uuuuu
008 241011s2020 xx obm 000 0 eng d
020 $a 9798658369716
035 $a (MiAaPQ)AAI27993401
035 $a AAI27993401
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Chiou, Kevin. $3 3698047
245 1 0 $a Direct, Additive-Free Processing of Carbon Nanotubes.
264 0 $c 2020
300 $a 1 online resource (93 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: 82-01, Section: B.
500 $a Advisor: Huang, Jiaxing.
502 $a Thesis (Ph.D.)--Northwestern University, 2020.
504 $a Includes bibliographical references
520 $a Carbon nanotubes (CNTs) have exceptional properties and are mass-producible at the ton scale as aggregated powders, but their difficulty in processing is a significant barrier to widespread use. Even after decades of research, there still isn't a solvent for CNTs that is massively available, easily removable, and non-damaging. The need for an effective solvent highlights the impact of my discovery that cresols, a group of naturally occurring and mass-produced methylphenols, are unexpectedly effective solvents for CNTs. They can homogenize CNTs up to tens of weight percent, without additional dispersing agents or nanotube functionalization. The outstanding processability comes from cresols' charge-transfer complexation capability between the phenolic hydroxyl groups and the aromatic surface of CNT, which separates CNTs and stabilize the solution. Since charge-transfer interactions are electrostatic in nature, the complexes are stable against solvents with low dielectric constants. When these solvents dilute dispersion of nanotubes in m-Cresol, the complexes stay stable and keeps m-cresol attracted to nanotubes' aromatic surface. Affinity of m-cresol to CNT assists the initial disentanglement of nanotube aggregates, and complexed solvent molecules help to keep CNT stable in dispersion.In a good solvent, separated nanotubes become outstretched like dissolved polymer molecules. This nanotube mixture displays viscoelastic properties typical of polymer solutions. With increasing CNT concentrations, nanotube mixtures can continuously transition between dilute dispersions, thick pastes, free-standing gels, and kneadable, playdough-like materials. These four highly processible states are immediately usable for different processing techniques such as Langmuir-Blodgett film assembly, blade coating, air-spray coating, 3D printing, and sculpting. In addition to being a solvent for CNT, m-cresol demonstrates that simple phenols can process various conjugated carbon nanomaterials. This concept was demonstrated by dispersing CNT with the aid of either 3,4-xylenol or vanillin. m-Cresol also disperses Carbon black and graphite, and this shows that various carbon nanomaterials behave similarly in complexing with phenols. These proofs of concepts demonstrate that carbon nanomaterials can be made more accessible by using phenols as processing aids and adapting existing equipment to process these nanomaterials.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Nanoscience. $3 587832
650 4 $a Engineering. $3 586835
650 4 $a Materials science. $3 543314
653 $a Carbon nanotube
653 $a Cresol
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0565
690 $a 0794
690 $a 0537
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Northwestern University. $b Materials Science and Engineering. $3 1058406
773 0 $t Dissertations Abstracts International $g 82-01B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27993401 $z click for full text (PQDT)