Design Rules for Fluorocarbon-Free Omniphobic Solvent Barriers in Paper-Based Devices

详细信息    查看全文

• 作者：Sana Jahanshahi-Anbuhi ; Kevin Pennings ; Vincent Leung ; Balamurali Kannan ; John D. Brennan ; Carlos D. M Filipe ; Robert H. Pelton
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 18, 2015
• 年：2015
• 卷：7
• 期：45
• 页码：25434-25440
• 全文大小：345K
• ISSN：1944-8252

文摘

The utility of hydrophobic wax barriers in paper-based lateral flow and multiwell devices for containment of aqueous solvents was extended to organic solvents and challenging aqueous surfactant solutions by preparation of a three layer barrier, consisting of internal pullulan impregnated paper barriers surrounded by external wax barriers. When paper impregnated with pullulan solution dries, the polymer forms solvent blocking lenses in the paper structure. Lens formation was illustrated by forming pullulan lenses in glass capillaries. The lens shapes were less curved compared to the predictions of a model based upon minimizing surface area. For barriers on Whatman # 1 filter paper, the pullulan molecular weight must be greater than 鈭?0 kDa, the mass fraction of pullulan in the barrier zone must be at least 32%, and there are restrictions on the minimum width of the pullulan impregnated zone.