Browsing by Author "Hu, A."
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Article Citation Count: Alarifi, H. A...et.al., "Determination of complete melting and surface premelting pointsof silver nanoparticles by molecular dynamics simulation" Journal of Physical Chemistry C, Vol.117, No.23, pp.12289-12298, (2013).Determination of complete melting and surface premelting pointsof silver nanoparticles by molecular dynamics simulation(Amer Chemical Soc, 2013) Alarifi, H. A.; Atis, M.; Özdoğan, C.; Hu, A.; Yavuz, M; Zhou, Y; 40569A molecular dynamics simulation based on the embedded-atom method was conducted at different sizes of single-crystal Ag nanoparticles (NPs) with diameters of 4 to 20 nm to find complete melting and surface premelting points. Unlike the previous theoretical models, our model can predict both complete melting and surface premelting points for a wider size range of NPs. Programmed heating at an equal rate was applied to all sizes of NPs. Melting kinetics showed three different trends that are, respectively, associated with NPs in the size ranges of 4 to 7 rim, 8 to 10 nm, and 12 to 20 nm. NPs in the first range melted at a single temperature without passing through a surface premelting stage. Melting of the second range started by forming a quasi-liquid layer that expanded to the core, followed by the formation of a liquid layer of 1.8 nm thickness that also subsequently expanded to the core with increasing temperature and completed the melting process. For particles in the third range, the 1.8 nm liquid layer was formed once the thickness of the quasi-liquid layer reached S rim. The liquid layer expanded to the core and formed thicker stable liquid layers as the temperature increased toward the complete melting point. The ratio of the quasi-liquid layer thickness to the NP radius showed a linear relationship with temperature.Article Citation Count: Alarifi, H. A...et.al., "Molecular dynamics simulation of sintering and surfacepremelting of silver nanoparticles" Materials Transactions, Vol.54, No.6, pp.884-889, (2013).Molecular dynamics simulation of sintering and surfacepremelting of silver nanoparticles(Japan Inst Metals, 2013) Alarifi, Hani; Atış, Murat; Özdoğan, Cem; Hu, A.; Yavuz, M.; Zhou, Y.; 40569Sintering of Ag nanoparticles (NPs) is increasingly being used as a driving mechanism for joining in the microelectronics industry. We therefore performed molecular dynamics simulations based on the embedded atom method (EAM) to study pressureless sintering kinetics of two Ag NPs in the size range of (4 to 20 nm), and sintering of three and four Ag NPs of 4 nm diameter. We found that the sintering process passed through three main stages. The first was the neck formation followed by a rapid increase of the neck radius at 50K for 20 nm particles and at 10 K for smaller NPs. The second was characterized by a gradual linear increase of the neck radius to particle radius ratio as the temperature of the sintered structure was increased to the surface premelting point. Different than previous sintering studies, a twin boundary was formed during the second stage that relaxed the sintered structure and decreased the average potential energy (PE). The third stage of sintering was a rapid shrinkage during surface premelting of the sintered structure. Based on pore geometry, densification occurred during the first stage for three 4 nm particles and during the second stage for four 4 nm particles. Sintering rates obtained by our simulation were higher than those obtained by theoretical models generally used for predicting sintering rates of microparticles
