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When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
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Updated: Mar 18, 2026

Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface
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Water Sorption and Drying Behavior of Crosslinked Dextrans.

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  • 1a Department of Natural Sciences, Faculty of Science and Engineering, Tokyo Denki University.

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Crosslinked dextran gels with lower crosslink density absorb more water and exhibit greater sorption hysteresis. Drying rates also depend on crosslink density, indicating network flexibility influences water behavior.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Dextran gels are widely used in various applications due to their biocompatibility and tunable properties.
  • Understanding the water sorption and drying behavior of these gels is crucial for optimizing their performance.
  • Crosslink density significantly influences the physical and chemical properties of polymer networks.

Purpose of the Study:

  • To investigate the effect of crosslink density on the water sorption and drying characteristics of crosslinked dextran gels.
  • To elucidate the relationship between network flexibility and water-induced changes in dextran gels.

Main Methods:

  • Sorption isotherms were measured to quantify water uptake.
  • Drying rates were monitored under controlled conditions.
  • The influence of varying crosslink densities on these properties was systematically studied.

Main Results:

  • Gels with lower crosslink density exhibited higher water sorption capacity.
  • Significant sorption and desorption hysteresis was observed, more pronounced in less crosslinked gels.
  • Drying rates were found to be dependent on the crosslink density of the dextran gels.

Conclusions:

  • The flexibility of the polymer network, dictated by crosslink density, is a key factor governing water sorption and drying behavior.
  • Lower crosslink density leads to a more adaptable network, facilitating greater water exchange.
  • These findings provide insights for designing dextran-based materials with tailored hydration properties.