Adhesion interactions between poly(vinyl alcohol) and iron‐oxide surfaces: The effect of acetylation

Abstract

Atomic force microscopy with chemically functionalized colloidal probes was used to study "acidbase" interactions between poly(vinyl alcohol) (PVA) and a metal surface. By using well-defined model surfaces, we have studied the adhesion forces between a hydroxylated surface and cantilever tips with varying hydroxyl content. Decreasing the amount of available hydroxyl groups dramatically reduced the observed adhesion force. The calculated bond energy for each cantilever tip was found to be in the range of typical hydrogen bond energies, i.e., 10 -40 kJ/mol, suggesting that the acid-base interactions are predominately hydrogen bonding. Similarly, the force versus distance curves using PVA functionalized colloidal probes showed a strong dependence on the chemical functionality of the tip and the degree of acetylation of the intervening PVA. It was observed that, with an increase in the acetyl content of the PVA, the adhesion force decreased.

Structure and Mechanical Properties of Mesostructured Functional Hybrid Coatings Based on Anisotropic Nanoparticles Dispersed in Poly(hydroxylethyl methacrylate)

“…The interactions between polymers and iron oxide particles have been extensively studied. ,– In particular, iron oxide particles have been reported to interact with polymer matrices through various interaction modes such as hydrogen-bonding, ionic interactions, , complexation reactions, – , or combinations of these different modes. The choice of this system (PHEMA/iron oxide) was governed both by the careful size and shape control of iron oxide nanoparticles offered by “Chimie Douce” synthesis as well as by the ability of iron oxide and PHEMA to interact with each other.…”

Functionalizing Nanoparticles with Biological Molecules: Developing Chemistries that Facilitate Nanotechnology

“…More commonly, the surface of the IONP is functionalized with an intermediate molecular layer that is subsequently exploited for further conjugation to a wide array of molecular partners. A variety of nucleophiles, such as hydroxy groups, , diols, , carboxylates, − phosphates, , and thiols , have a relatively good affinity for IO surfaces and have been extensively investigated as functional intermediaries for attaining direct conjugation. The nucleophilic character of these moieties is responsible for binding to the electrophilic IO surface through interaction with iron’s empty orbitals, forming a combination of covalent and physisorptive bonds .…”

Preparation and Potential Applications of Super Paramagnetic Nano-Fe3O4

“…The natural polymers commonly used include: glucan [79], proteins [80], starch [81] and polypeptides [82]. The synthetic polymers usually used include: polyethylene glycol [83] and polyvinyl alcohol [84,85].…”