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

Encapsulation and one-dimensional al...

Kang, Youngjong.

Linked to FindBook

Google Book

Amazon

博客來

Encapsulation and one-dimensional alignment of nanomaterials within cross-linked block copolymer micelles.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Encapsulation and one-dimensional alignment of nanomaterials within cross-linked block copolymer micelles./
Author:	Kang, Youngjong.
Description:	215 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-09, Section: B, page: 4839.
Contained By:	Dissertation Abstracts International66-09B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3188581
ISBN:	9780542310430

Encapsulation and one-dimensional alignment of nanomaterials within cross-linked block copolymer micelles.
Kang, Youngjong.

Encapsulation and one-dimensional alignment of nanomaterials within cross-linked block copolymer micelles. - 215 p.

Source: Dissertation Abstracts International, Volume: 66-09, Section: B, page: 4839.

Thesis (Ph.D.)--University of Minnesota, 2005.

Assembly of amphiphilic block copolymers and nanomaterials is described in this thesis. Amphiphilic block copolymers can be spontaneously assembled and crosslinked around inorganic nanomaterials to form permanent core-shell nanostructures without the need for covalent attachment of the polymer to the particle. Single-walled carbon nanotubes (SWNTs) and Au nanoparticles were encapsulated within micelles made from amphiphilic poly(styrene- block-acrylic acid) (PS-b-PAA) or poly(methylmethacrylate- block-acrylic acid) (PMMA-b-PAA) copolymers. Encapsulation was accomplished by simultaneously desolvating the hydrophobic or the hydrophobically modified nanomaterials and the hydrophobic polymer block to localize the nanomaterial within the micelle core. The hydrophilic, outer shells of these micelles were then chemically crosslinked with a difunctional linker molecule. The resulting core-shell architectures were extensively characterized by atomic force microscopy (AFM), electron microscopy (TEM, SEM), dark-field optical microscopy and optical spectroscopy. The structure and physical properties of these nanomaterials were precisely determined by the characteristics of the self-assembled components. For Au nanoparticles, the thickness of shell can be predicted from theoretical models of polymer adsorption onto highly curved surfaces, and controlled by varying the ratio of polymer to available nanoparticle surface area. The thermal conductance measurement of the encapsulated Au nanoparticles shows that the permeability of polymer shells can be easily modulated by organic co-solvents. We also found that the encapsulated nanomaterials can be spontaneously assembled into 1D chains by a morphological transition of polymer micelles from sphere to worm-like structure. Electron microscopy demonstrated that the structure of the resulting 1D chain was precisely dictated by the characteristics of the encapsulated nanomaterials.

ISBN: 9780542310430Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Encapsulation and one-dimensional alignment of nanomaterials within cross-linked block copolymer micelles.
LDR:03133nmm 2200277 4500 001 1827189
005 20061222091116.5
008 130610s2005 eng d
020 $a 9780542310430
035 $a (UnM)AAI3188581
035 $a AAI3188581
040 $a UnM $c UnM
100 1 $a Kang, Youngjong. $3 1916131
245 1 0 $a Encapsulation and one-dimensional alignment of nanomaterials within cross-linked block copolymer micelles.
300 $a 215 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-09, Section: B, page: 4839.
500 $a Adviser: T. Andrew Taton.
502 $a Thesis (Ph.D.)--University of Minnesota, 2005.
520 $a Assembly of amphiphilic block copolymers and nanomaterials is described in this thesis. Amphiphilic block copolymers can be spontaneously assembled and crosslinked around inorganic nanomaterials to form permanent core-shell nanostructures without the need for covalent attachment of the polymer to the particle. Single-walled carbon nanotubes (SWNTs) and Au nanoparticles were encapsulated within micelles made from amphiphilic poly(styrene- block-acrylic acid) (PS-b-PAA) or poly(methylmethacrylate- block-acrylic acid) (PMMA-b-PAA) copolymers. Encapsulation was accomplished by simultaneously desolvating the hydrophobic or the hydrophobically modified nanomaterials and the hydrophobic polymer block to localize the nanomaterial within the micelle core. The hydrophilic, outer shells of these micelles were then chemically crosslinked with a difunctional linker molecule. The resulting core-shell architectures were extensively characterized by atomic force microscopy (AFM), electron microscopy (TEM, SEM), dark-field optical microscopy and optical spectroscopy. The structure and physical properties of these nanomaterials were precisely determined by the characteristics of the self-assembled components. For Au nanoparticles, the thickness of shell can be predicted from theoretical models of polymer adsorption onto highly curved surfaces, and controlled by varying the ratio of polymer to available nanoparticle surface area. The thermal conductance measurement of the encapsulated Au nanoparticles shows that the permeability of polymer shells can be easily modulated by organic co-solvents. We also found that the encapsulated nanomaterials can be spontaneously assembled into 1D chains by a morphological transition of polymer micelles from sphere to worm-like structure. Electron microscopy demonstrated that the structure of the resulting 1D chain was precisely dictated by the characteristics of the encapsulated nanomaterials.
520 $a Because the crosslinked micelle shells are topologically linked to nanoparticles rather than chemically bound, we suggest that the encapsulation approach to core-shell nanostructures might be used to add polymer shells to nanomaterials that lack effective surface chemistries.
590 $a School code: 0130.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 0 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 66-09B.
790 1 0 $a Taton, T. Andrew, $e advisor
790 $a 0130
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3188581