Forced desorption of polymers from interfaces

Staple, Douglas B.; Geisler, Michael; Hugel, Thorsten; Kreplak, Laurent; Kreuzer, H. J.

doi:10.1088/1367-2630/13/1/013025

Cited by 20 publications

(26 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The corresponding detachment distance of the cantilever tip R (detachment height), Fig. 7b, reveals a specific sigmoidal shape in agreement with the results based on the Master Equation [23]. At low velocities of pulling, v c , when the chain still largely succeeds in relaxing back to equilibrium during detachment, an interesting entropy effect is manifested in Fig.…”

Section: Resultssupporting

confidence: 86%

“…To this end we used the second order Runge -Kutta (RK) algorithm for stochastic differential-algebraic equations (see Appendix B for more details). The advantage of the stochastic differential equations approach as compared to the Master Equation method [23] is that the former one gives a more detailed (not averaged) dynamic information corresponding to each individual force-displacement trajectory (as is often in an experiment). The result of averaging over 300 runs is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Force spectroscopy of polymer desorption: theory and molecular dynamics simulations

et al. 2014

View full text Add to dashboard Cite

Forced detachment of a single polymer chain, strongly adsorbed on a solid substrate, is investigated by two complementary methods: a coarse-grained analytical dynamical model, based on the Onsager stochastic equation, and Molecular Dynamics (MD) simulations with a Langevin thermostat. The suggested approach makes it possible to go beyond the limitations of the conventional Bell-Evans model. We observe a series of characteristic force spikes when the pulling force is measured against the cantilever displacement during detachment at constant velocity vc (displacement control mode) and find that the average magnitude of this force increases as vc increases. The probability distributions of the pulling force and the end-monomer distance from the surface at the moment of the final detachment are investigated for different adsorption energies ε and pulling velocities vc. Our extensive MD simulations validate and support the main theoretical findings. Moreover, the simulations reveal a novel behavior: for a strong-friction and massive cantilever the force spike pattern is smeared out at large vc. As a challenging task for experimental bio-polymer sequencing in future we suggest the fabrication of a stiff, super-light, nanometer-sized AFM probe.

show abstract

Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Force spectroscopy of polymer desorption: theory and molecular dynamics simulations

et al. 2014

View full text Add to dashboard Cite

show abstract

“…From experimental point of view tearing off a strongly adsorbed chain is a rather common and important situation. 2,34,35…”

Section: Self-avoiding Chains: Strong Adsorptionmentioning

confidence: 99%

Coil-bridge transition in a single polymer chain as an unconventional phase transition: Theory and simulation

Klushin

Skvortsov

Polotsky

et al. 2014

The Journal of Chemical Physics

View full text Add to dashboard Cite

The coil-bridge transition in a self-avoiding lattice chain with one end fixed at height H above the attractive planar surface is investigated by theory and Monte Carlo simulation. We focus on the details of the first-order phase transition between the coil state at large height H ⩾ Htr and a bridge state at H ⩽ Htr, where Htr corresponds to the coil-bridge transition point. The equilibrium properties of the chain were calculated using the Monte Carlo pruned-enriched Rosenbluth method in the moderate adsorption regime at (H/Na)tr ⩽ 0.27 where N is the number of monomer units of linear size a. An analytical theory of the coil-bridge transition for lattice chains with excluded volume interactions is presented in this regime. The theory provides an excellent quantitative description of numerical results at all heights, 10 ⩽ H/a ⩽ 320 and all chain lengths 40 < N < 2560 without free fitting parameters. A simple theory taking into account the effect of finite extensibility of the lattice chain in the strong adsorption regime at (H/Na)tr ⩾ 0.5 is presented. We discuss some unconventional properties of the coil-bridge transition: the absence of phase coexistence, two micro-phases involved in the bridge state, and abnormal behavior in the microcanonical ensemble.

show abstract

“…2B), combined with a strong adhesion. Curves of this kind are typically associated with unpeeling of polymers or bers [7,27].…”

Section: Introductionmentioning

confidence: 99%

AFM Investigation of Biological Nanostructures

et al. 2012

View full text Add to dashboard Cite

Nanostructures created by living organisms, optimized through millions of years of evolution, can be a valuable inspiration for nanotechnology. We employ atomic force microscopy to examine such structures in materials created by common organisms caddisy and diatoms. Caddisy larvae are well known for their ability to spin silk, which serves as an adhesive tape to glue various materials and collect food in aqueous environment. Atomic force microscopy imaging of caddisy silk, performed for the rst time by our team, has shown that its surface is patterned with 150 nm extensions a feature related to its exceptional underwater sticking abilities. Results of force spectroscopy of protein structures found on the surface are also shown. A characteristic feature of diatoms is that they are encased within a unique silica cell wall called frustules, patterned with 200 nm pores, which allow cellular interaction with the environment. We perform atomic force microscopy imaging of frustules in living diatoms as well as adhesion measurements inside pores.

show abstract

Forced desorption of polymers from interfaces

Cited by 20 publications

References 30 publications

Force spectroscopy of polymer desorption: theory and molecular dynamics simulations

Force spectroscopy of polymer desorption: theory and molecular dynamics simulations

Coil-bridge transition in a single polymer chain as an unconventional phase transition: Theory and simulation

AFM Investigation of Biological Nanostructures

Contact Info

Product

Resources

About