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Tytuł:
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Leakage-proof microencapsulation of phase change materials by emulsification with acetylated cellulose nanofibrils.
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Autorzy:
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Shi X; Department of Bioproducts and Biosystems, Aalto University, Espoo 02150, Finland.
Yazdani MR; Department of Mechanical Engineering, Aalto University, Espoo 02150, Finland. Electronic address: .
Ajdary R; Department of Bioproducts and Biosystems, Aalto University, Espoo 02150, Finland.
Rojas OJ; Department of Bioproducts and Biosystems, Aalto University, Espoo 02150, Finland; Bioproducts Institute, Departments of Chemical & Biological Engineering, Chemistry, and Wood Science, 2360 East Mall, The University of British Columbia, Vancouver, BC V6T 1Z3, Canada. Electronic address: .
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Źródło:
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Carbohydrate polymers [Carbohydr Polym] 2021 Feb 15; Vol. 254, pp. 117279. Date of Electronic Publication: 2020 Oct 21.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Publication: <1992-> : Barking : Elsevier Applied Science Publishers
Original Publication: London [Eng.] : Applied Science Publishers, c1981-
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MeSH Terms:
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Cellulose/*analogs & derivatives
Nanofibers/*chemistry
Acetylation ; Capsules ; Cellulose/chemistry ; Cellulose/ultrastructure ; Colloids ; Drug Stability ; Emulsions ; Hot Temperature ; Microscopy, Electron, Scanning ; Nanofibers/ultrastructure ; Paraffin/chemistry ; Phase Transition ; Rheology ; Suspensions ; Thermogravimetry
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Contributed Indexing:
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Keywords: Acetylated cellulose nanofibril; Encapsulation; Heat storage; PCM; Paraffin; Phase change material
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Substance Nomenclature:
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0 (Capsules)
0 (Colloids)
0 (Emulsions)
0 (Suspensions)
3J2P07GVB6 (acetylcellulose)
8002-74-2 (Paraffin)
9004-34-6 (Cellulose)
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Entry Date(s):
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Date Created: 20201228 Date Completed: 20210407 Latest Revision: 20210407
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Update Code:
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20240105
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DOI:
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10.1016/j.carbpol.2020.117279
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PMID:
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33357855
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We use acetylated cellulose nanofibrils (AcCNF) to stabilize transient emulsions with paraffin that becomes shape-stable and encapsulated phase change material (PCM) upon cooling. Rheology measurements confirm the gel behavior and colloidal stability of the solid suspensions. We study the effect of nanofiber content on PCM leakage upon melting and compare the results to those from unmodified CNF. The nanostructured cellulose promotes paraffin phase transition, which improves the efficiency of thermal energy exchange. The leakage-proof microcapsules display high energy absorption capacity (ΔH m = 173 J/g) at high PCM loading (up to 80 wt%), while effectively controlling the extent of supercooling. An excellent thermal stability is observed during at least 100 heating/cooling cycles. Degradation takes place at 291 °C, indicating good thermal stability. The high energy density and the effective shape and thermal stabilization of the AcCNF-encapsulated paraffin points to a sustainable solution for thermal energy storage and conversion.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
