https://scholars.lib.ntu.edu.tw/handle/123456789/630579
標題: | Solid-like elastic behavior of nanosized concentrated emulsions: Size-dependent Young's and bulk moduli | 作者: | Chang, Hsin Yu Tsao, Heng Kwong YU-JANE SHENG |
關鍵字: | Bulk modulus | Interfacial tension | Jammed structure | Monodisperse concentrated emulsion | Size-dependence | Young's modulus | 公開日期: | 15-六月-2023 | 卷: | 380 | 來源出版物: | Journal of Molecular Liquids | 摘要: | Concentrated emulsions with volume fractions exceeding the critical value have diverse applications in foods, cosmetics, coatings, and pharmaceuticals. They have a jammed structure and tend to exhibit a solid-like behavior. Unfortunately, the mechanical properties of monodisperse concentrated emulsions are challenging to study by experiments or simulations because of thermodynamic instability and droplet coalescence. A mesoscopic simulation method is employed to study the mechanical properties of the concentrated emulsion. Knowledge of the microstructure and interdroplet interaction among monodisperse droplets is not a prerequisite. Effects of the volume fraction (ϕ), droplet diameter (D), and interfacial tension (σ) on Young's modulus (E) and bulk modulus (K) are investigated systematically. For ϕ < ϕc, Young's modulus is absent and the bulk modulus rises with increase ϕ. For ϕ > ϕc, both Young's and bulk moduli are found to grow with increasing ϕ and σ. However, these solid-like properties become more prominent as D is decreased. On the basis of the interfacial energy per unit volume, our simulation results can be well represented by the relations E ∼ ϕ0.13(ϕ-ϕc)1.55(σ/D) and K ∼ ϕ1.06(ϕ-ϕc)0.15(σ/D). Moreover, the relationship for soft materials E = 3 K(1 − 2ν) is satisfied. The Poisson's ratio (ν) is very close to 0.5 but still decreases slightly with increasing ϕ. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/630579 | ISSN: | 01677322 | DOI: | 10.1016/j.molliq.2023.121745 |
顯示於: | 化學工程學系 |
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