4.3 Article

Microfiber Textiles of Adsorbing Materials for Heat Transformations

Journal

HEAT TRANSFER ENGINEERING
Volume 43, Issue 19, Pages 1652-1663

Publisher

TAYLOR & FRANCIS INC
DOI: 10.1080/01457632.2021.2000736

Keywords

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Funding

  1. DICEAM (Department of Civil, Energetic, Environmental and Materials Engineering, Mediterranean University of Reggio Calabria)
  2. MiSE (Ministry of Economic Development) with CNR (National Research Council)

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The study focuses on producing hybrid microfibers adsorbent materials using electrospinning technique, and characterizing the thermal stability and water sorption properties of SAPO-34 and silica gel microfibers. The experimental results showed that PMMA as carrier exhibited good mechanical properties and breathability, validating its potential as an ideal component for adsorption applications.
Adsorbent materials made of hybrid, inorganic/organic, microfibers can be easily produced by electrospinning. Due to the presence of a polymeric component, microfibers coatings and textiles are intended for adsorption heat transformers driven by low-temperature heat sources. In this work, two different systems, SAPO-34 and silica gel microfibers with an adsorbing particles concentration of 68 wt%, have been electrospun using polymethylmethacrylate (PMMA) as polymeric carrier. The thermal stability of hybrid microfibers coatings were characterized by thermogravimetric analysis in the temperature range 25-500 degrees C while water sorption properties were evaluated measuring isobars at 10 mbar and 40 mbar by vacuum thermogravimetry. The mechanical properties of hybrid microfibers were measured by a specially developed micro-tensile tester. Adsorption measures demonstrated that PMMA/SAPO-34 and PMMA/silica gel microfibers maintained all water sorption characteristics of the original adsorbent materials and that PMMA did not occlude the adsorbents porosity. PMMA resulted an ideal component for its thermal stability, good affinity with the adsorbent phases and mechanical resistance. From this point of view, the addition of SAPO-34 powder has been shown to improve the tensile strength of PMMA/SAPO-34 fabrics compared to pure PMMA microfibers.

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