Multivalent-Counterion-Induced Surfactant Multilayer Formation at Hydrophobic and Hydrophilic Solid鈥揝olution Interfaces

详细信息    查看全文

• 作者：Jeffrey Penfold ; Robert K. Thomas ; Peixun Li ; Hui Xu ; Ian M. Tucker ; Jordan T. Petkov ; Devinderjit S. Sivia
• 刊名：Langmuir
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：31
• 期：24
• 页码：6773-6781
• 全文大小：469K
• ISSN：1520-5827

文摘

Surface multilayer formation from the anionic鈥搉onionic surfactant mixture of sodium dodecyl dioxyethylene sulfate, SLES, and monododecyl dodecaethylene glycol, Cb>12b>Eb>12b>, by the addition of multivalent Al³⁺ counterions at the solid鈥搒olution interface is observed and characterized by neutron reflectivity, NR. The ability to form surface multilayer structures on hydrophobic and hydrophilic silica and cellulose surfaces is demonstrated. The surface multilayer formation is more pronounced and more well developed on the hydrophilic and hydrophobic silica surfaces than on the hydrophilic and hydrophobic cellulose surfaces. The less well developed multilayer formation on the cellulose surfaces is attributed to the greater surface inhomogeneities of the cellulose surface which partially inhibit lateral coherence and growth of the multilayer domains at the surface. The surface multilayer formation is associated with extreme wetting properties and offers the potential for the manipulation of the solid surfaces for enhanced adsorption and control of the wetting behavior.