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Melting, Solidification and Sintering/Coalescence of Nanoparticles.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
書名/作者:	Melting, Solidification and Sintering/Coalescence of Nanoparticles.
作者:	Wang, Ningyu.
面頁冊數:	253 p.
附註:	Source: Dissertation Abstracts International, Volume: 72-01, Section: B, page: .
Contained By:	Dissertation Abstracts International72-01B.
標題:	Engineering, Industrial.
標題:	Nanotechnology.
ISBN:	9781124342603
摘要、提要註:	The research goal of this work is to develop an understanding of the mechanism of nanoparticle melting, solidification and sintering resulting from a laser-triggered nanoscale spark-plasma heat source. The study is motivated by the fact that physical properties of nanoparticles exhibit a strong size effect due to significant increase of surface area to volume ratio thus affects nanoparticle consolidation and related material processes. Molecular dynamics (MD) is a promising simulation method for understanding of material behaviors at nanometer scales and is selected as a major computational tool for this study.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3435686

Melting, Solidification and Sintering/Coalescence of Nanoparticles.
Wang, Ningyu.

Melting, Solidification and Sintering/Coalescence of Nanoparticles. - 253 p.

Source: Dissertation Abstracts International, Volume: 72-01, Section: B, page: .

Thesis (Ph.D.)--The Ohio State University, 2010.

The research goal of this work is to develop an understanding of the mechanism of nanoparticle melting, solidification and sintering resulting from a laser-triggered nanoscale spark-plasma heat source. The study is motivated by the fact that physical properties of nanoparticles exhibit a strong size effect due to significant increase of surface area to volume ratio thus affects nanoparticle consolidation and related material processes. Molecular dynamics (MD) is a promising simulation method for understanding of material behaviors at nanometer scales and is selected as a major computational tool for this study.

ISBN: 9781124342603Subjects--Topical Terms:

423093
Engineering, Industrial.

Melting, Solidification and Sintering/Coalescence of Nanoparticles.
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100 1 $a Wang, Ningyu. $3 423581
245 1 0 $a Melting, Solidification and Sintering/Coalescence of Nanoparticles.
300 $a 253 p.
500 $a Source: Dissertation Abstracts International, Volume: 72-01, Section: B, page: .
500 $a Adviser: Stanislav I. Rokhlin.
502 $a Thesis (Ph.D.)--The Ohio State University, 2010.
520 $a The research goal of this work is to develop an understanding of the mechanism of nanoparticle melting, solidification and sintering resulting from a laser-triggered nanoscale spark-plasma heat source. The study is motivated by the fact that physical properties of nanoparticles exhibit a strong size effect due to significant increase of surface area to volume ratio thus affects nanoparticle consolidation and related material processes. Molecular dynamics (MD) is a promising simulation method for understanding of material behaviors at nanometer scales and is selected as a major computational tool for this study.
520 $a A reversible nonhomogeneous surface premelting model of Au nanoparticles is demonstrated by our simulations. With temperature increase liquid-like atoms first appear at some vertices and edges of surface facets, then small liquid regions grow and at temperatures close to the particle melting temperature, most of the remaining solid-like surface atoms reside on {111} planes which are most stable against surface premelting. The appearance of a contiguous liquid layer (complete surface premelting) is size dependent and is not observed in very small nanoparticles.
520 $a An integrated molecular dynamics and two-temperature computational model has been developed to study ultrafast laser irradiation of Au nanoparticles at low intensity where surface premelting and solid-liquid phase transition are major interests. Conditions for temporary superheating and stable overcooling were examined carefully. Nonhomogeneous surface premelting mechanism like that in the equilibrium melting was also observed. The appearance of a contiguous liquid layer (complete surface premelting) is size dependent and is not related to surface premelting history. As shown by simulations when temperature of Au nanoparticles is stabilized they are in the thermodynamically equilibrated state and their lattice temperature and fraction of remaining solid atoms are function of only absorbed laser energy and independent on laser pulse duration.
520 $a Microcanonical critical droplet theory (MCD) was applied to interpret the stabilized state of our ultrafast melting simulations. Two forms of melting instability observed in our MD simulations, namely globally stable to metastable state and metastable to catastrophic solid inner core collapse, are also revealed by the MCD theory.
520 $a Systematic study of two Au nanoparticles sintering was conducted. Due to the high surface-to-volume ratio, nanoparticles can be significantly heated by surface energy release during sintering. During sintering in the liquid phase, the initial neck growth can be well described by the viscous flow model. For two particles with initial temperature just below the single particle melting temperature, the initial neck growth is initially controlled by viscous flow and then later by grain boundary diffusion. At initial temperatures well below melting, the sintering process occurs very rapidly and ends with a non-spherical oval particle shape. This is attributed to formation of liquid-like atoms in the neck region.
590 $a School code: 0168.
650 4 $a Engineering, Industrial. $3 423093
650 4 $a Nanotechnology. $3 192698
690 $a 0546
690 $a 0652
710 2 $a The Ohio State University. $b Industrial and Systems Engineering. $3 423582
773 0 $t Dissertation Abstracts International $g 72-01B.
790 1 0 $a Rokhlin, Stanislav I., $e advisor
790 1 0 $a Farson, Dave F. $e committee member
790 1 0 $a Castro, Jose M. $e committee member
790 $a 0168
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3435686