New PDF release: Nano-Surface Chemistry

By Morton Rosoff

Describes hierarchical assemblies in biology and organic tactics that happen on the nanoscale throughout membranes and at interfaces.

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The latter observation rules out the possibility of electrostatic shielding, which would serve to weaken the tip–sample interaction as the solvent permittivity increased. The use of deionized water as a solvent in the same tip–sample system resulted in an adhesive force at least an order of magnitude larger than that of methanol, the medium which had the highest adhesive force of the alcohols. The authors could not explain their results in terms of a single model and thus concluded that a combination of mechanisms must be evoked in order to describe the observed adhesion.

Relationship Between Pull-Off and Adhesion The magnitude of the pull-off force depends on the nature of the tip–sample interaction during contact. Adhesion depends on the deformation of the tip and the sample, because attractive forces are proportional to the contact area. Quantifying the work of adhesion is difficult. The measured magnitude of ⌬␥ is strongly dependent on environment, surface roughness, the rate of pull-off, and inelastic deformation surrounding the contact. An important consideration for the direct physical measurement of adhesion via pulloff measurements is the influence of the precise direction of the applied force.

52 nN, were associated with the interchain interactions of single pairs of DNA oligonucleotides 12, 16, and 20 base pairs in length. Interchain adhesion was studied by immobilizing C20 oligomers on both surfaces and then hybridizing a homopolymer of inosine on one side. The homopolymer was thought to have an average length of 160 bases but was actually composed of a wide distribution of molecular weights, resulting in a broad distribution of rupture lengths. 46 nN. Dammer et al. [61] studied the specific interaction between polyclonal biotin–directed antibodies and biotinylated bovine serum albumin.

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