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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering
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Published on: March 1, 2016

Temperature responsive surface layers of modified celluloses.

Rasmus Bodvik1, Esben Thormann, Leif Karlson

  • 1Department of Chemistry, Surface and Corrosion Science, Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden.

Physical Chemistry Chemical Physics : PCCP
|January 20, 2011
PubMed
Summary
This summary is machine-generated.

Methylcellulose (MC) and hydroxypropylmethylcellulose (HPMC) layers on silica surfaces compact reversibly with increasing temperature. MC layers showed more prominent compaction due to their lower phase transition temperature.

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Bacterial Cellulose Spheres that Encapsulate Solid Materials
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Published on: February 26, 2021

Area of Science:

  • Polymer science
  • Surface chemistry
  • Materials science

Background:

  • Cellulose derivatives like methylcellulose (MC) and hydroxypropylmethylcellulose (HPMC) are widely used polymers.
  • Understanding their behavior on surfaces is crucial for applications in coatings, drug delivery, and biomaterials.
  • The temperature-dependent properties of adsorbed polymer layers are not fully characterized.

Purpose of the Study:

  • To investigate the temperature-dependent properties of pre-adsorbed methylcellulose (MC) and hydroxypropylmethylcellulose (HPMC) layers.
  • To determine the structural, mass, and viscoelastic changes of these layers on silica and hydrophobized silica surfaces.
  • To compare the behavior of MC and HPMC with respect to temperature variations.

Main Methods:

  • Quartz crystal microbalance with dissipation monitoring (QCM-D) for mass and viscoelasticity.
  • Ellipsometry for layer thickness and refractive index.
  • Atomic force microscopy (AFM) for surface morphology and topography.
  • Adsorption at 25 °C followed by temperature variation from 25 °C to 50 °C.

Main Results:

  • Pre-adsorbed MC and HPMC layers exhibited increased compactness with rising temperature (25 °C to 50 °C).
  • This compaction effect was reversible upon decreasing the temperature.
  • Methylcellulose (MC) showed more pronounced compaction than hydroxypropylmethylcellulose (HPMC), correlating with MC's lower phase transition temperature near 50 °C.
  • High water content was retained in the adsorbed layers even at 50 °C.

Conclusions:

  • The study demonstrates the reversible, temperature-induced compaction of MC and HPMC layers on silica surfaces.
  • The findings highlight the influence of polymer structure (MC vs. HPMC) on thermal response and surface interactions.
  • These results provide valuable insights into the behavior of cellulose derivatives in response to thermal stimuli, relevant for material design and application optimization.