title: Time and distance dependence of reversible polymer bridging followed by single-molecule force spectroscopy.
abstract: Polymer bridging between surfaces plays an important role in a range of fundamental processes in the material and life sciences. Bridges formed by main-chain reversible polymers differ from their covalent analogs in that they can dynamically adjust their size and shape in response to external stimuli and have the potential to reform following bond scission. In this work, the time and distance dependence of main-chain reversible polymer bridge formation are studied using an atomic force microscope. The bridging process was studied using single-molecule force spectroscopy, and its dependence on the distance between surfaces and equilibration time was probed. The number of bridges formed decreases as the gap width increases, from approximately 2 bridges per 14 s equilibration at separations of 5-15 nm to approximately 0.5 bridges per 14 s equilibration at separations of 35-45 nm. The kinetics of bridge formation appear to be slightly faster at smaller separations.
authors.affiliation: Department of Chemistry, Department of Mechanical Engineering and Materials Science, and Center for Biologically Inspired Materials and Material Systems, Duke University, Durham, North Carolina 27708-0346, USA.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Serpe
authors.forename: Monica
authors.initials: M
authors.lastname: Rivera
authors.forename: Farrell R
authors.initials: FR
authors.lastname: Kersey
authors.forename: Robert L
authors.initials: RL
authors.lastname: Clark
authors.forename: Stephen L
authors.initials: SL
authors.lastname: Craig
mesh_terms: D001483:Base Sequence; D002412:Cations / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000737:chemistry*; D004247:DNA / Q000737:chemistry; D018625:Microscopy, Atomic Force; D011108:Polymers / Q000737:chemistry*; D013057:Spectrum Analysis; D013213:Starch / Q000737:chemistry; D013997:Time Factors
chemical_list: D002412:Cations; D003432:Cross-Linking Reagents; D011108:Polymers; D013213:Starch; D004247:DNA