Polymer Chains of a Large Persistence Length in a Polymer Brush Require a Lower Force to Be Compressed Than Chains with a Short Persistence Length
Source abstract
Abstract
The force on a polydisperse polymer brush with chains of increasing persistence length, LP, is obtained by numerical simulations. Unexpectedly, the force needed to compress a stiff brush is smaller than that for a soft brush. This is due to the ordering of the largest polymer chains in bundles, which buckle when LP grows releasing pressure, thus reducing the force. Stiffer brushes lose translational entropy, increasing the entropy of the solvent. Our predictions agree with optical tweezer force spectroscopy and ellipsometry measurements on polymer brushes. Clues for the interpretation of experiments on human cervical epithelial cells that are covered with polymer-like brushes are offered, which find that cancer cells are softer than normal ones.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Polymer Surface Interaction Studies · Force Microscopy Techniques and Applications · Adhesion, Friction, and Surface Interactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Posgrado en Ciencias Naturales e Ingeniería, Universidad Autónoma Metropolitana Unidad Cuajimalpa, Ciudad de México 05300, Mexico
Departamento de Ciencias Naturales, Universidad Autónoma Metropolitana Unidad Cuajimalpa, Ciudad de México 05300, Mexico
Departamento de Química, Universidad Autónoma Metropolitana Unidad Iztapalapa, Av. San Rafael Atlixco 186, Ciudad de México 09340, Mexico
División de Ingeniería Química y Bioquímica, Tecnológico de Estudios Superiores de Ecatepec, Av. Tecnológico s/n, Ecatepec, Estado de México 55210, Mexico
Funding
Consejo Nacional de Ciencia y Tecnolog?a
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