Interaction forces between crossed quartz filaments in presence of adsorbed poly (vinyl alcohol)

Knapschinsky, L.; Katz, W.; Ehmke, B.; Sonntag, H.

doi:10.1007/bf01411240

Cited by 19 publications

(5 citation statements)

References 5 publications

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“…Sonntag and co-workers [15] developed an apparatus similar to Derjaguin's [2] where they measured the forces between two crossed quartz filaments. In their apparatus, one filament was attached to a micrometer screw and a piezoelectric column with movement control of about 1 nm.…”

Section: Other Versions Of the Sfamentioning

confidence: 99%

Recent advances in the surface forces apparatus (SFA) technique

et al. 2010

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The surface forces apparatus (SFA) has been used for many years to measure the physical forces between surfaces, such as van der Waals (including Casimir) and electrostatic forces in vapors and liquids, adhesion and capillary forces, forces due to surface and liquid structure (e.g. solvation and hydration forces), polymer, steric and hydrophobic interactions, bio-specific interactions as well as friction and lubrication forces. Here we describe recent developments in the SFA technique, specifically the SFA 2000, its simplicity of operation and its extension into new areas of measurement of both static and dynamic forces as well as both normal and lateral (shear and friction) forces. The main reason for the greater simplicity of the SFA 2000 is that it operates on one central simple-cantilever spring to generate both coarse and fine motions over a total range of seven orders of magnitude (from millimeters to ångstroms). In addition, the SFA 2000 is more spacious and modulated so that new attachments and extra parts can easily be fitted for performing more extended types of experiments (e.g. extended strain friction experiments and higher rate dynamic experiments) as well as traditionally non-SFA type experiments (e.g. scanning probe microscopy and atomic force microscopy) and for studying different types of systems.

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Section: Other Versions Of the Sfamentioning

confidence: 99%

Recent advances in the surface forces apparatus (SFA) technique

et al. 2010

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“…Either the interaction profile is measured at constant chemical potential of all species (such as in force balance and spring devices), or the response to a change of the chemical potential of solvent for example is investigated (such as in osmotic equilibria based methods and as in light, X‐rays or neutrons scattering experiments). Concerning the first category of investigation at constant chemical potential, the techniques use two macroscopic surfaces of the same nature as the particle surfaces, and the force‐to‐distance relation is measured with a deflection method (surface force balances, surface force apparatus, atomic force microscope, etc.). The main difficulty is to make such surfaces or to stick the microscopic particles, without altering the surface chemistry of their interfaces, to the macroscopic surfaces of these devices.…”

Section: Introductionmentioning

confidence: 99%

From Heterocoagulation to Biorecognition: Preparation of Surfaces for Direct Measurement of Their Interactions in a Surface Force Apparatus

Kékicheff

2014

Macromolecular Symposia

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Summary Due to the atomic resolution in surface separation accessible the Surface Force Apparatus technique provides an avenue for investigating the interactions in real systems, provided the model surfaces chosen for study have both equivalent intricate surface chemistry and structural properties. To overcome the difficulty of surface‐altering treatments when preparing suitable surfaces for the SFA and to realize interfaces fully representative of real systems immersed in solvents we have developed different experimental procedures. In particular, adsorption of nanoparticles from bulk colloidal dispersions, controlled solvent flow for coating substrates with polyelectrolytes multilayers, Langmuir Blodgett deposition of phospholipids membranes inserting ligands/receptors, all illustrate how one can get insights into subtle phenomena revealed by the force‐distance profiles when the true colloidal state is maintained, biomaterials are built and molecular recognition is involved.

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“…limited to measurement of (necessarily) attractive vdW interactions between like materials (mica (14), silica (15), gold (16), titania (17)), although it should be noted that, An understanding of the van der Waals (vdW) interactions between surfaces is of fundamental importance to theo-for the mica and silica cases, the vdW contributions were ries of interfacial properties such as colloidal stability and estimated by subtraction of a calculated electrical doublewetting behavior. Historically, the first theory of the vdW layer interaction from the experimental force-distance data.…”

Section: Introductionmentioning

confidence: 99%