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Connections Between Acid-Base Interactions and the Work of Adhesion

Wilson, Michael Charles
http://rave.ohiolink.edu/etdc/view?acc_num=akron1586439939982267

Abstract Details

2020, Doctor of Philosophy, University of Akron, Polymer Science.
Biological systems have developed a number of strategies to adhere underwater. In studying the materials which they use, more robust technologies can be made for applications. One facet of these adhesives, which must be characterized, is creating bonds between the glue and a surface. In trying to understand the connection between creating strong bonds between molecules and behavior seen in interfacial phenomena, I use the framework proposed by Fowkes, which considers the thermodynamic work of adhesion in dispersive and acid-base interaction components. In order to measure interfacial interactions, I use interface-sensitive sum frequency generation spectroscopy (SFG). The frequency shift of molecular vibrations of sapphire surface hydroxyl groups can be examined in SFG and can be connected to the enthalpy of acid-base interactions. My research involves verifying this calculation, by correlating the frequency shift seen in SFG with the acid-base parameters of Drago and Wayland. It is found that SFG can be used to measure the strength of interfacial acid-base interactions. Further, this measured enthalpy of acid-base interactions can be connected with interfacial phenomena including adsorption and adhesion. Binary liquid mixtures are brought in contact with the sapphire surface, and the difference in the works of adhesion of each liquid with the sapphire surface are calculated using the adsorption isotherm measured from SFG. This is compared with the calculated difference in work of adhesion from the Fowkes framework. The values are seen to correlate well with that from adsorption, connecting interfacial molecular interactions with macroscopic phenomena. Using adhesion measurements and the Johnson-Kendall-Roberts contact mechanics theory, the work of adhesion values calculated are compared with the calculated works of adhesion using the Fowkes theory. Bridging the connection between molecular interactions and macroscopic phenomena can aid in understanding interfacial phenomena in biological systems, but can also support the design of new molecules for adhesive applications.
Ali Dhinojwala (Advisor)
Hunter King (Committee Chair)
Abraham Joy (Committee Member)
Mesfin Tsige (Committee Member)
Adam Smith (Committee Member)
167 p.
Chemistry; Physical Chemistry; Polymers
Adhesion; Adsorption; Acid-base Interactions; Sum Frequency Generation

Recommended Citations

Citations

  • Wilson, M. C. (2020). Connections Between Acid-Base Interactions and the Work of Adhesion [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1586439939982267

    APA Style (7th edition)

  • Wilson, Michael. Connections Between Acid-Base Interactions and the Work of Adhesion. 2020. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1586439939982267.

    MLA Style (8th edition)

  • Wilson, Michael. "Connections Between Acid-Base Interactions and the Work of Adhesion." Doctoral dissertation, University of Akron, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1586439939982267

    Chicago Manual of Style (17th edition)

akron1586439939982267
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This open access ETD is published by University of Akron and OhioLINK.