文献类型：期刊文献

英文题名：Tuning Surface Chemistry and Ionic Strength to Control Nanoparticle Adsorption and Elastic Dilational Modulus at Air-Brine Interface

作者：Da, Chang[1,2];Zhang, Xuan[1,2,3];Alzobaidi, Shehab[1,2];Hu, Dongdong[1,2,4];Wu, Pingkeng[1,2];Johnston, Keith P.[1,2]

机构：[1]Univ Texas Austin, McKetta Dept Chem Engn, Austin, TX 78712 USA;[2]Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA;[3]China Univ Petr, Coll Petr Engn, Qingdao 266580, Peoples R China;[4]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：37

期号：19

起止页码：5795

外文期刊名：LANGMUIR

收录：;EI(收录号：20212210416350);WOS:【SCI-EXPANDED(收录号:WOS:000654294100005)】；

基金：We are very thankful to Total S.A. company and the Welch Foundation (F-1319) for the financial support. Shehab Alzobaidi is also supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. (DGE-1610403). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

语种：英文

外文关键词：Phase interfaces - Adsorption - Ligands - Ionic strength - Association reactions - Hydrophobicity - Interface states - Nanoparticles - Surface chemistry

摘要：The relationship between the interfacial rheology of nanoparticle (NP) laden air-brine interfaces and NP adsorption and interparticle interactions is not well understood, particularly as a function of the surface chemistry and salinity. Herein, a nonionic ether diol on the surface of silica NPs provides steric stabilization in bulk brine and at the air-brine interface, whereas a second smaller underlying hydrophobic ligand raises the hydrophobicity to promote NP adsorption. The level of NPs adsorption at steady state is sufficient to produce an interface with a relatively strong elastic dilational modulus E' = d gamma/d ln A. However, the interface is ductile with a relatively slow change in E' as the interfacial area is varied over a wide range during compression and expansion. In contrast, for silica NPs stabilized with only a single hydrophobic ligand, the interfaces are often more fragile and may fracture with small changes in area. The presence of concentrated divalent cations improves E' and ductility by screening electrostatic dipolar repulsion and strengthening the attractive forces between nanoparticles. The ability to tune the interfacial rheology with NP surface chemistry is of great interest for designing more stable gas/brine foams.