使用纳米矿物氧化物的液态金属油乳液玻璃化,Advanced Materials Interfaces

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使用纳米矿物氧化物的液态金属油乳液玻璃化
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2023-03-21 , DOI: 10.1002/admi.202202527
Seoung Young Ryu ₁ , Hyunji Lee ₁ , Younggi Hong ₂ , Harshad Bandal ₃ , Munju Goh ₂ , Hern Kim ₃ , Joohyung Lee ₁

Affiliation

Ga 和 Ga 基合金最近作为“液态金属 (LMs)”受到广泛关注，具有低毒性、低熔点、高流动性和高导电性的综合优势。为增强可加工性和新应用而修改 LM 的一种重要方法是将它们定制成悬浮在液体介质中的胶体微滴。在这项研究中，油基胶体系统的独特玻璃化行为显示为悬浮的 LM 微滴，这些微滴是由作为固体流变改性剂添加的各种矿物氧化物 (MO) 纳米颗粒诱导的。由于 MO 表面和 LM 的氧化皮之间的极性相互作用，MO 对非极性油介质中悬浮的 LM 液滴的表面表现出高亲和力。因此，即使是微量添加的 MOs (Φ _MO < 0.01) 将自由流动的 LM 悬浮液 (Φ _MO ≈ 0.55) 转化为高粘弹性流体，从而实现高级加工（例如 3D 打印）。在高 MO 负载量（Φ _MO ≥ 0.1）下，获得了具有前所未有的高流变强度的乳液，其特征是屈服应力≈10 ⁴ Pa。在高度玻璃化的乳液中，部分烧结效应是由高样品内部应力引起的，这提高了乳液的热物理性质可能对多种实际应用有用。

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Vitrification of Liquid Metal-in-Oil Emulsions Using Nano-Mineral Oxides

Ga and Ga-based alloys have recently received significant attention as “liquid metals (LMs)” with the combined advantages of a low toxicity, low melting point, high fluidity, and high conductivity. An important method for modifying LMs for enhanced processabilities and new applications is to tailor them into colloidal microdroplets suspended in a liquid medium. In this study, the unique vitrification behavior of oil-based colloidal systems is shown with suspended LM microdroplets induced by various mineral oxide (MO) nanoparticles that are added as solid rheology modifiers. MOs exhibit a high affinity for the surfaces of suspended LM droplets in an apolar oil medium due to the polar interaction between the MO surface and the oxide skin of the LM. Thus, even minute amounts of added MOs (Φ_MO < 0.01) transform a free-flowing LM suspension (Φ_MO ≈ 0.55) into a highly viscoelastic fluid that enables advanced processing (e.g., 3D printing). At high MO loadings (Φ_MO ≥ 0.1), an emulsion with unprecedentedly high rheological strength is obtained, characterized by a yield stress of ≈10⁴ Pa. In highly vitrified emulsions, partial sintering effects are induced by high internal sample stress, which improves the thermophysical properties of emulsions that may be useful for several practical applications.

更新日期：2023-03-21

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