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Fabrication of nanometer-scale structures :Self-assembled monolayers and magnetic particles

Record Type:	Electronic resources : Monograph/item
Title/Author:	Fabrication of nanometer-scale structures :
Reminder of title:	Self-assembled monolayers and magnetic particles
Author:	Love, John Christopher.
Description:	284 p.
Notes:	Adviser: George M. Whitesides.
Notes:	Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2431.
Contained By:	Dissertation Abstracts International65-05B.
Subject:	Chemistry, Physical.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3131910
ISBN:	0496791508

Fabrication of nanometer-scale structures :Self-assembled monolayers and magnetic particles
Love, John Christopher.

Fabrication of nanometer-scale structures :Self-assembled monolayers and magnetic particles [electronic resource] - 284 p.

Adviser: George M. Whitesides.

Thesis (Ph.D.)--Harvard University, 2004.

Magnetic particles are used commonly in biology for separating whole cells, organelles, and biomolecules, and for applying mechanical forces to single cells. Three types of magnetic particles were synthesized: (i) composite nanoparticles of iron oxide coated with 2--3 nm gold nanoparticles (Chapter 4); (ii) fluorescent silica (200 nm) coated on one hemisphere with a thin film of nickel and a precious metal (Chapter 5); and (iii) rods containing patterned section of diamagnetic and ferromagnetic metals (Chapter 6). The tunable physical properties of the particles included the magnetic character (superparamagnetic, ferromagnetic), the geometry of the magnetic field, and the surface chemistry. A soft lithographic method for localizing magnetic particles to specific regions of single cells was developed by generating elastomeric objects with micron-scale patterns of embedded magnetic materials (Chapter 7).

ISBN: 0496791508Subjects--Topical Terms:

226924
Chemistry, Physical.

Fabrication of nanometer-scale structures :Self-assembled monolayers and magnetic particles
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502 $a Thesis (Ph.D.)--Harvard University, 2004.
520 # $a Magnetic particles are used commonly in biology for separating whole cells, organelles, and biomolecules, and for applying mechanical forces to single cells. Three types of magnetic particles were synthesized: (i) composite nanoparticles of iron oxide coated with 2--3 nm gold nanoparticles (Chapter 4); (ii) fluorescent silica (200 nm) coated on one hemisphere with a thin film of nickel and a precious metal (Chapter 5); and (iii) rods containing patterned section of diamagnetic and ferromagnetic metals (Chapter 6). The tunable physical properties of the particles included the magnetic character (superparamagnetic, ferromagnetic), the geometry of the magnetic field, and the surface chemistry. A soft lithographic method for localizing magnetic particles to specific regions of single cells was developed by generating elastomeric objects with micron-scale patterns of embedded magnetic materials (Chapter 7).
520 # $a SAMs result from the spontaneous organization of molecules adsorbed to a surface and represent one class of organic nanostructures (Chapter 1). The combination of microcontact printing---a soft lithographic technique for transferring organic molecules to surfaces---and the ability of SAMs to protect the underlying surface from wet chemical etchants made it possible to fabricate micro- and nanostructures of palladium and gold-palladium with lateral dimensions as small as 50 nm. SAMs on thin films of palladium and gold-palladium resist chemical etchants better than those on gold (Chapters 2--3, Appendix X--XI). The metallic structures generated have fewer defects (pinholes and etch pits) and less edge roughness than structures formed on gold. The enhanced etch contrast between bare and SAM-functionalized regions of the palladium results from a thin (10--20 A) layer of palladium sulfide that forms between the organic monolayer and the bulk metal.
520 # $a The development of technologies based on nanometer-scale objects requires new methods for making small (1--100 nm) structures. Part I of this thesis describes the synthesis and characterization of self-assembled monolayers (SAMs) of alkanethiolates on palladium and gold-palladium alloys, and their use for fabricating metallic micro- and nanostructures by microcontact printing and selective chemical etching. Part II describes the development of new types of magnetic particles and methods for manipulating them.
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