Biobased Spore Microcapsules for Asphalt Self-Healing

Alpizar-Reyes, Erik; Concha, José L.; Martin-Martinez, Francisco; Norambuena-Contreras, Jose

doi:10.1021/acsami.2c07301

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Biobased Spore Microcapsules for Asphalt Self-Healing

Erik Alpizar-Reyes

, José L. Concha, Francisco Martin-Martinez, Jose Norambuena-Contreras

ACS Applied Materials & Interfaces, Volume: 14, Issue: 27, Pages: 31296 - 31311

Swansea University Authors: Francisco Martin-Martinez, Jose Norambuena-Contreras

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DOI (Published version): 10.1021/acsami.2c07301

Abstract

Asphalt pavements and bituminous composites are majorly damaged by bitumen aging and fatigue cracking by traffic load. To add, maintenance and reparation of asphalt pavements is expensive and also releases significant amounts of greenhouse gases. These issues can be mitigated by promoting asphalt se...

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Published in:	ACS Applied Materials & Interfaces
ISSN:	1944-8244 1944-8252
Published:	American Chemical Society (ACS) 2022
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa60631
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first_indexed	2022-08-05T12:16:34Z
last_indexed	2023-01-13T19:20:54Z
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spelling	v2 60631 2022-07-26 Biobased Spore Microcapsules for Asphalt Self-Healing a5907aac618ec107662c888f6ead0e4a Francisco Martin-Martinez Francisco Martin-Martinez true false 73c6854ebb10465fbf7faab297135641 0000-0001-8327-2236 Jose Norambuena-Contreras Jose Norambuena-Contreras true false 2022-07-26 Asphalt pavements and bituminous composites are majorly damaged by bitumen aging and fatigue cracking by traffic load. To add, maintenance and reparation of asphalt pavements is expensive and also releases significant amounts of greenhouse gases. These issues can be mitigated by promoting asphalt self-healing mechanisms with encapsulated rejuvenators. The ability of the required microcapsules to be resilient against high temperatures, oxidation, and mechanical stress is essential to promote such self-healing behavior without compromising the field performance of the asphalt pavement. This work proposes, for the first time, the use of extremely resistant biobased spores for the encapsulation of recycled oil-based rejuvenators to produce more resilient self-healing pavements. Spore encapsulants were obtained from natural spores (Lycopodium clavatum) by applying different chemical treatments, which enabled the selection of the best morphologically intact and clean spore encapsulant. The physical, morphological, and physicochemical changes were examined using fluorescence images, ATR-FTIR, SEM, size distribution, XRD, TGA and DSC analyses. Sunflower oil was used as the encapsulated rejuvenator with an optimal sol colloidal mixture for sporopollenin–oil of 1:5 (gram-to-gram). Vacuum, passive, and centrifugal encapsulation techniques were tested for loading the rejuvenator inside the clean spores and for selecting the best encapsulation technology. The encapsulation efficiency and the profiles of the accelerated release of the rejuvenator from the loaded spores over time were studied, and these processes were visualized with optical and inverted fluorescence microscopy. Vacuum encapsulation was identified as the best loading technique with an encapsulation efficiency of 93.02 ± 3.71%. The rejuvenator was successfully encapsulated into the clean spores, as observed by optical and SEM morphologies. In agreement with the TGA and DSC, the microcapsules were stable up to 204 °C. Finally, a self-healing test was conducted through fluorescence tests to demonstrate how these biobased spore microcapsules completely heal a crack into an aged bitumen sample in 50 min. Journal Article ACS Applied Materials & Interfaces 14 27 31296 31311 American Chemical Society (ACS) 1944-8244 1944-8252 spores; sporopollenin; spore microcapsules; rejuvenators; biobased spore microcapsules; aged bitumen; bituminous materials; asphalt self-healing 13 7 2022 2022-07-13 10.1021/acsami.2c07301 COLLEGE NANME COLLEGE CODE Swansea University The authors thank the funding given by the National Research and Development Agency (ANID) through the Research Projects FONDECYT Postdoctoral no. 3200227 and FONDECYT Regular no. 1190027. The authors wish to thank the financial support given by the University of Bío-Bío for his internal PhD scholarship granted. 2024-07-22T15:15:04.3175285 2022-07-26T10:35:33.3620952 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry Erik Alpizar-Reyes 0000-0002-1920-1465 1 José L. Concha 2 Francisco Martin-Martinez 3 Jose Norambuena-Contreras 0000-0001-8327-2236 4
title	Biobased Spore Microcapsules for Asphalt Self-Healing
spellingShingle	Biobased Spore Microcapsules for Asphalt Self-Healing Francisco Martin-Martinez Jose Norambuena-Contreras
title_short	Biobased Spore Microcapsules for Asphalt Self-Healing
title_full	Biobased Spore Microcapsules for Asphalt Self-Healing
title_fullStr	Biobased Spore Microcapsules for Asphalt Self-Healing
title_full_unstemmed	Biobased Spore Microcapsules for Asphalt Self-Healing
title_sort	Biobased Spore Microcapsules for Asphalt Self-Healing
author_id_str_mv	a5907aac618ec107662c888f6ead0e4a 73c6854ebb10465fbf7faab297135641
author_id_fullname_str_mv	a5907aac618ec107662c888f6ead0e4a_*_Francisco Martin-Martinez 73c6854ebb10465fbf7faab297135641_*_Jose Norambuena-Contreras
author	Francisco Martin-Martinez Jose Norambuena-Contreras
author2	Erik Alpizar-Reyes José L. Concha Francisco Martin-Martinez Jose Norambuena-Contreras
format	Journal article
container_title	ACS Applied Materials & Interfaces
container_volume	14
container_issue	27
container_start_page	31296
publishDate	2022
institution	Swansea University
issn	1944-8244 1944-8252
doi_str_mv	10.1021/acsami.2c07301
publisher	American Chemical Society (ACS)
college_str	Faculty of Science and Engineering
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hierarchy_top_title	Faculty of Science and Engineering
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department_str	School of Engineering and Applied Sciences - Chemistry{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemistry
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description	Asphalt pavements and bituminous composites are majorly damaged by bitumen aging and fatigue cracking by traffic load. To add, maintenance and reparation of asphalt pavements is expensive and also releases significant amounts of greenhouse gases. These issues can be mitigated by promoting asphalt self-healing mechanisms with encapsulated rejuvenators. The ability of the required microcapsules to be resilient against high temperatures, oxidation, and mechanical stress is essential to promote such self-healing behavior without compromising the field performance of the asphalt pavement. This work proposes, for the first time, the use of extremely resistant biobased spores for the encapsulation of recycled oil-based rejuvenators to produce more resilient self-healing pavements. Spore encapsulants were obtained from natural spores (Lycopodium clavatum) by applying different chemical treatments, which enabled the selection of the best morphologically intact and clean spore encapsulant. The physical, morphological, and physicochemical changes were examined using fluorescence images, ATR-FTIR, SEM, size distribution, XRD, TGA and DSC analyses. Sunflower oil was used as the encapsulated rejuvenator with an optimal sol colloidal mixture for sporopollenin–oil of 1:5 (gram-to-gram). Vacuum, passive, and centrifugal encapsulation techniques were tested for loading the rejuvenator inside the clean spores and for selecting the best encapsulation technology. The encapsulation efficiency and the profiles of the accelerated release of the rejuvenator from the loaded spores over time were studied, and these processes were visualized with optical and inverted fluorescence microscopy. Vacuum encapsulation was identified as the best loading technique with an encapsulation efficiency of 93.02 ± 3.71%. The rejuvenator was successfully encapsulated into the clean spores, as observed by optical and SEM morphologies. In agreement with the TGA and DSC, the microcapsules were stable up to 204 °C. Finally, a self-healing test was conducted through fluorescence tests to demonstrate how these biobased spore microcapsules completely heal a crack into an aged bitumen sample in 50 min.
published_date	2022-07-13T15:15:03Z
_version_	1805288947608190976
score	11.028886

Biobased Spore Microcapsules for Asphalt Self-Healing

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