Size Dependence of the Melting Temperature and Mechanisms of the Coalescence/Sintering on the Nanoscale
Open accessAbstract
We have proposed to use the nanoparticle (NP) melting temperature T m to distinguish between the coalescence and sintering processes on the nanoscale. According to our molecular dynamics results, obtained on Au NPs, the coalescence of nanoproplets may be interpreted as a hydrodynamic phenomenon on the nanoscale, and the characteristic coalescence time τ is a linear function of the initial particle radius r 0. In turn, the sintering of two crystalline NPs (T < T m ) relates to a grain boundary formation as a result of an alignment of the crystallographic orientations of the sintering NPs, and in this case a dependence of τ on r 0 has not been revealed.
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In this case, processing temperature (650 °C) is lower than melting point (~2200 °C), and coalescence mechanism relates rather to surface or grain boundary diffusion than to hydrodynamic flows inside droplet; however Frenkel's approach is still valid for rough process characterization.
“In our case, the processing temperature (650 °C) is lower than the melting point (~2200 °C), and the coalescence mechanism relates rather to the surface or grain boundary diffusion than to the hydrodynamic flows inside the droplet; however, Frenkel’s approach is still valid for rough process characterization [83].”
From Control of Columnar Grain Microstructure in CSD LaNiO3 Films (2023) · cites this paper as [83]
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Experimental — accuracy not yet measuredSintering depends on the crystalline orientation of particles because grain boundary energy relates to the degree of misorientation between two particles and gives an energy barrier for particle coalescence.
“It should be noted that sintering depends on the crystalline orientation of particles as the grain boundary energy relates to the degree of misorientation between two particles and gives an energy barrier for particle coalescence [83,85].”
From Control of Columnar Grain Microstructure in CSD LaNiO3 Films (2023) · cites this paper as [83]
Section 5 reports that initially misaligned crystalline Au nanoparticles rotate to align their orientations during sintering, forming a grain-boundary contact. The Conclusion likewise describes orientation alignment as central to sintering. Neither passage says that grain-boundary energy varies with the degree of misorientation or creates an energy barrier to coalescence. (LLM, conf=0.86)
Experimental — accuracy not yet measuredThe characteristic time of coalescence τ follows linear dependence on initial particle radius r0: τ = η σ r0, where η is shear viscosity coefficient and σ is surface tension.
“The characteristic time of coalescence 𝜏 followed the linear dependence on the initial particle radius 𝑟0: τ = η σ 𝑟0, where 𝜂 is the shear viscosity coefficient, and 𝜎 is the surface tension [82,83,84].”
From Control of Columnar Grain Microstructure in CSD LaNiO3 Films (2023) · cites this paper as [83]
Section 4 reports a linear dependence of characteristic coalescence time on initial particle radius in the authors’ Au nanoparticle simulations. But its equation (5) includes a factor of 8/3 rather than the quoted equation τ = ησr0, and the authors say their measured proportionality coefficient differs from that formula’s prediction. (LLM, conf=0.88)
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Research works printed but not linked: 4
- Goudeli E and Pratsinis S E 2015 AIChE Journal 62 589
- Grigorev I S and Meilikhov E Z (eds) 1997 Handbook of Physical Quantities (Boca Raton: CRC Press LLC)
- Nichols F A and Mullins W W 1965 J. Appl. Phys. 36 1826 MMPAM'2019 IOP Conf. Series: Journal of Physics: Conf. Series 1352 (2019) 012044 IOP Publishing doi:10.1088/1742-6596/1352/1/012044
- Alchagirov A B, Alchairov B B, Taova T M and Khokonov Kh B 2001 Trans. Join. Weld. Res. Inst. Osaka. Univ. 30 287
Cited by
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Control of Columnar Grain Microstructure in CSD LaNiO3 Films
Atanova, A. V., Seregin, D. S., Zhigalina, O. M., Khmelenin, D. N., Orlov, G. A., Turkina, D. I., Sigov, A. S., & Vorotilov, K. A. (2023) · Molecules · doi:10.3390/molecules28041938 · Cited by 5 · see citing works
- Authors
- Samsonov, V. M., Alymov, M. I., Talyzin, I. V., & Vasilyev, S. A.
- Affiliations
- Russian Academy of Sciences (RU)
- ORCID
- Vasilyev, S A
- Venue
- Journal of Physics: Conference Series
- Publisher
- IOP Publishing
- Published
- 2019-10-01
- Volume
- 1352
- Issue
- 1
- Pages
- 012044
- ISSN
- 1742-6588 (ISSN-L)
- 1742-6596
- OpenAlex
- W2988237757
- Cited by
- 5
- References
- 0
- Citations by year
- 2023: 3 · 2022: 2
- FWCI
- 3.78
- Type
- conference paper
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- Locations
- Journal of Physics Conference Series (publishedVersion, cc-by)
- Funders
- Ministry of Science and Higher Education of the Russian Federation
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › nanoparticles nucleation surface interactions
- Physical Sciences › Materials Science › Materials Chemistry › Microstructure and mechanical properties
- Physical Sciences › Engineering › Biomedical Engineering › Laser-Ablation Synthesis of Nanoparticles
- Keywords
- coalescence, sintering, size effect, gold nanoparticles, grain boundary formation, coalescence time, molecular dynamics simulation
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