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Nanocrystals: Synthesis, phase tran...

Tang, Jing.

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Nanocrystals: Synthesis, phase transformation and self-assembly.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nanocrystals: Synthesis, phase transformation and self-assembly./
作者:	Tang, Jing.
面頁冊數:	127 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3476.
Contained By:	Dissertation Abstracts International65-07B.
標題:	Chemistry, Physical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3138369
ISBN:	0496855301

Nanocrystals: Synthesis, phase transformation and self-assembly.
Tang, Jing.

Nanocrystals: Synthesis, phase transformation and self-assembly. - 127 p.

Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3476.

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

Nanocrystals have recently attracted much attention both for their fundamental properties and their many important technological applications. Synthesis of high quality nanocrystals is the first and key step to this area of science. In Chapter 2 and 3, different approaches have been explored to synthesize group IVB transition metal oxide nanocrystals (TiO2, ZrO2 and HfO2) and their binary oxides nanocrystals (HfxZr1-xO2). In Chapter 2, a nonhydrolytic sol-gel method which involves the condensation or cross condensation between a metal halide and metal alkoxide in a strongly coordinating solvent is utilized to synthesize HfO2 and HfxZr1-xO 2 nanocrystals. Monodispersed nanocrystals with different size, shape, and crystallinity are obtained as evidenced by various techniques including TEM, XRD, Raman spectroscopy, and elemental analysis. In Chapter 3, a new organometallic route to TiO2 nanoparticles is described. Bis(cyclooctatetraene)titanium, Ti(COT)2, reacts with dimethylsulfoxide to produce TiO2. Without a coordinating ligand, amorphous TiO2 forms; while with ligands the precipitation is arrested, and TiO2 nanocrystals form.

ISBN: 0496855301Subjects--Topical Terms:

560527
Chemistry, Physical.

Nanocrystals: Synthesis, phase transformation and self-assembly.
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245 1 0 $a Nanocrystals: Synthesis, phase transformation and self-assembly.
300 $a 127 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3476.
500 $a Adviser: Louis Brus.
502 $a Thesis (Ph.D.)--Columbia University, 2004.
520 $a Nanocrystals have recently attracted much attention both for their fundamental properties and their many important technological applications. Synthesis of high quality nanocrystals is the first and key step to this area of science. In Chapter 2 and 3, different approaches have been explored to synthesize group IVB transition metal oxide nanocrystals (TiO2, ZrO2 and HfO2) and their binary oxides nanocrystals (HfxZr1-xO2). In Chapter 2, a nonhydrolytic sol-gel method which involves the condensation or cross condensation between a metal halide and metal alkoxide in a strongly coordinating solvent is utilized to synthesize HfO2 and HfxZr1-xO 2 nanocrystals. Monodispersed nanocrystals with different size, shape, and crystallinity are obtained as evidenced by various techniques including TEM, XRD, Raman spectroscopy, and elemental analysis. In Chapter 3, a new organometallic route to TiO2 nanoparticles is described. Bis(cyclooctatetraene)titanium, Ti(COT)2, reacts with dimethylsulfoxide to produce TiO2. Without a coordinating ligand, amorphous TiO2 forms; while with ligands the precipitation is arrested, and TiO2 nanocrystals form.
520 $a In Chapter 4, with detailed study and analysis, we conclude the concomitant phase and shape change of the nanoparticles observed during the reactions to make HfO2 and Hf rich HfxZr1-xO 2 nanocrystals is a result of the Martensitic phase transformation. The post-synthesis heat-induced phase transformation of the tetragonal Hf xZr1-xO2 (0 ≤ x ≤ 1) nanocrystals is also studied. As temperature increases all the tetragonal nanocrystals transform to monoclinic phase accompanied by the particle size increase as evidenced by XRD and TEM, which confirms that there is a critical size for the phase transformation to occur.
520 $a In Chapter 5, the oxidation of aqueous magnetite (Fe3O 4) nanocrystals to maghemite (Fe2O3) is monitored via the loss of near-IR optical absorbance. The kinetics closely follow the diffusion in a sphere model as suggested by previous literature reports.
520 $a In Chapter 6, the self-assembly of 12-nm PbSe nanocrystals on a graphite surface during the solvent evaporation is analyzed within a van der Waals phase condensation model. The interparticle attractive force, phase separation kinetics, and critical coverage in this system are revealed from the aggregation spatial patterns at different kinetic stages.
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710 2 0 $a Columbia University. $3 571054
773 0 $t Dissertation Abstracts International $g 65-07B.
790 1 0 $a Brus, Louis, $e advisor
790 $a 0054
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3138369