Interfacial rheology insights: particle texture and Pickering foam stability
Interfacial rheology insights: particle texture and Pickering foam stability
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DOI：
10.1088/1361-648x/acde2c
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发表时间：
2023-09-25
影响因子：
2.7
通讯作者：
Razavi, Sepideh
中科院分区：
文献类型：
--
作者：
Brown, Nick;de la Pena, Alec;Razavi, Sepideh
界面流变学的研究进行建立之间的连接的颗粒负载界面的流变特性和稳定性的皮克林泡沫。研究了气相二氧化硅和球形二氧化硅稳定泡沫的性能，重点考察了泡沫的微观结构和含液量。与十二烷基硫酸钠稳定的泡沫相比，Pickering泡沫表现出气泡粗化的显著减少。滴形张力测量颗粒涂层界面表明，吉布斯稳定性准则是满足两种颗粒类型在各种表面覆盖率，支持所观察到的逮捕气泡粗化颗粒稳定的泡沫。然而，尽管两种颗粒类型的总体泡沫高度相似，但用气相二氧化硅颗粒稳定的泡沫表现出更高的抗液体排出性。这种差异是由于气相二氧化硅颗粒形成的界面网络的较高的屈服应变，相比，由球形胶体颗粒在类似的表面压力下形成的。我们的研究结果强调，虽然这两种颗粒可以产生持久的泡沫，所得的皮克林泡沫可能会表现出变化的微观结构，液体含量和抗不稳定机制，在每种情况下，从各自的界面流变性能。
Interfacial rheology studies were conducted to establish a connection between the rheological characteristics of particle-laden interfaces and the stability of Pickering foams. The behavior of foams stabilized with fumed and spherical colloidal silica particles was investigated, focusing on foam properties such as bubble microstructure and liquid content. Compared to a sodium dodecyl sulfate-stabilized foam, Pickering foams exhibited a notable reduction in bubble coarsening. Drop shape tensiometry measurements on particle-coated interfaces indicated that the Gibbs stability criterion was satisfied for both particle types at various surface coverages, supporting the observed arrested bubble coarsening in particle-stabilized foams. However, although the overall foam height was similar for both particle types, foams stabilized with fumed silica particles demonstrated a higher resistance to liquid drainage. This difference was attributed to the higher yield strain of interfacial networks formed by fumed silica particles, as compared to those formed by spherical colloidal particles at similar surface pressures. Our findings highlight that while both particles can generate long-lasting foams, the resulting Pickering foams may exhibit variations in microstructure, liquid content, and resistance to destabilization mechanisms, stemming from the respective interfacial rheological properties in each case.