Mechanics of soft interfaces studied with displacement-controlled scanning force microscopy

Goertz, Matthew P.; Moore, Nathan W.

doi:10.1016/j.progsurf.2010.07.003

Cited by 23 publications

(28 citation statements)

References 247 publications

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“…The twin saturated alkyl tails of DSPC molecule and the polar phosphatidylcholine headgroup are connected each other through a glycerol linker [ 20 ], which constitute the long hydrophobic alkyl tails and the hydrophilic headgroup. Langmuir–Blodgett (LB) [ 21 ] technique was used to prepare the phospholipid films, and AFM was used to characterize these obtained LB films.…”

Section: Experimental Sectionsmentioning

confidence: 99%

Nanomechanics of phospholipid LB film studied layer by layer with AFM

Zhu

et al. 2014

Chemistry Central Journal

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BackgroundPhospholipid, a main component of cell membrane, has been explored as a model system of the cell membrane and temporary scaffold materials in recent studies. The mechanical properties of phospholipid layers are essentially interesting since it is involved in several biological processes.ResultsHere, the nanomechanical properties such as indentation force, adhesion force and DMT (Derjaguin-Müller-Toporov) modulus of 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) Langmuir-Blodgett (LB) films were analyzed layer by layer with Atomic Force Microscope (AFM) under deionized water condition.ConclusionsThe penetration distances in the indentation force curves are equal to the thicknesses of phospholipid films, and the yield forces of DSPC LB films in deionized water are smaller than that of similar lipid films in buffered solutions due to the influence of ions. Moreover, the DMT modulus of upper layer DSPC LB film is different from that of monolayer DSPC LB film due to the influence of their different substrates. Our results suggest that environment such as surrounding ions and substrate will strongly influence the measured nano-mechanical properties of the lipid bilayer, especially that of the down layer.Graphical AbstractA process about the exploration of nanomechanics of DSPC LB film.

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Section: Experimental Sectionsmentioning

confidence: 99%

Nanomechanics of phospholipid LB film studied layer by layer with AFM

Zhu

et al. 2014

Chemistry Central Journal

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“…34 Applying forces at the end of the cantilever also enables more accurate measurement of the tip displacement because one does not need to account for the displacement of the base of the cantilever, as in piezoacoustic excitation. This is particularly important when shaking the cantilever well below or above its resonance frequency, where the motion of the cantilever base induced by piezoacoustic excitation can be comparable to or larger than the motion of the tip.…”

Section: Discussionmentioning

confidence: 99%

Modular apparatus for electrostatic actuation of common atomic force microscope cantilevers

Long

Cannara

2015

Review of Scientific Instruments

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Piezoelectric actuation of atomic force microscope (AFM) cantilevers often suffers from spurious mechanical resonances in the loop between the signal driving the cantilever and the actual tip motion. These spurious resonances can reduce the accuracy of AFM measurements and in some cases completely obscure the cantilever response. To address these limitations, we developed a specialized AFM cantilever holder for electrostatic actuation of AFM cantilevers. The holder contains electrical contacts for the AFM cantilever chip, as well as an electrode (or electrodes) that may be precisely positioned with respect to the back of the cantilever. By controlling the voltages on the AFM cantilever and the actuation electrode(s), an electrostatic force is applied directly to the cantilever, providing a near-ideal transfer function from drive signal to tip motion. We demonstrate both static and dynamic actuations, achieved through the application of direct current and alternating current voltage schemes, respectively. As an example application, we explore contact resonance atomic force microscopy, which is a technique for measuring the mechanical properties of surfaces on the sub-micron length scale. Using multiple electrodes, we also show that the torsional resonances of the AFM cantilever may be excited electrostatically, opening the door for advanced dynamic lateral force measurements with improved accuracy and precision.

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“…The characterization of Au probes used in earlier IFM experiments [8] was not reported. IFM probes are not generally believed to wear as much as AFM tips used for imaging, for which even relatively hard silicon nitride tips are known to wear significantly over typical durations of use [24,265]. Kunert, et al [319] recently used lattice Boltzmann simulations to show that during fluid drainage between a spherical probe and a randomly rough surface, the effect of the roughness was to shift the no-slip plane (boundary) of the rough surface to a position between the lowest and farthest extending point.…”

Section: Molecular Shape Of Probe and Substratementioning

confidence: 99%

Studies of the viscoelastic properties of water confined between surfaces of specified chemical nature.

Houston¹,

Grest²,

Moore³

et al. 2010

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This report summarizes the work completed under the Laboratory Directed Research and Development (LDRD) project 10-0973 of the same title. Understanding the molecular origin of the no-slip boundary condition remains vitally important for understanding molecular transport in biological, environmental and energy-related processes, with broad technological implications. Moreover, the viscoelastic properties of fluids in nanoconfinement or near surfaces are not well-understood. We have critically reviewed progress in this area, evaluated key experimental and theoretical methods, and made unique and important discoveries addressing these and related scientific questions. Thematically, the discoveries include insight into the orientation of water molecules on metal surfaces, the premelting of ice, the nucleation of water and alcohol vapors between surface asperities and the lubricity of these molecules when confined inside nanopores, the influence of water nucleation on adhesion to salts and silicates, and the growth and superplasticity of NaCl nanowires.

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Mechanics of soft interfaces studied with displacement-controlled scanning force microscopy

Cited by 23 publications

References 247 publications

Nanomechanics of phospholipid LB film studied layer by layer with AFM

Nanomechanics of phospholipid LB film studied layer by layer with AFM

Modular apparatus for electrostatic actuation of common atomic force microscope cantilevers

Studies of the viscoelastic properties of water confined between surfaces of specified chemical nature.

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