Tunable chitosan-alginate capsules for a controlled release of crystallisation inhibitors in mortars
Plasters and renders used in historic monuments are vulnerable to degradation caused by salt weathering. Crystallisation inhibitors (molecules/ions that alter salt crystallisation) mixed into mortars have shown promising results in mitigating salt damage by inhibiting salt crystallisation, promoting...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2023-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | https://www.matec-conferences.org/articles/matecconf/pdf/2023/05/matecconf_smartincs2023_02011.pdf |
| _version_ | 1797835216958521344 |
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| author | Kamat Ameya Palin Damian Lubelli Barbara Schlangen Erik |
| author_facet | Kamat Ameya Palin Damian Lubelli Barbara Schlangen Erik |
| author_sort | Kamat Ameya |
| collection | DOAJ |
| description | Plasters and renders used in historic monuments are vulnerable to degradation caused by salt weathering. Crystallisation inhibitors (molecules/ions that alter salt crystallisation) mixed into mortars have shown promising results in mitigating salt damage by inhibiting salt crystallisation, promoting salt transport to the evaporating surface, and modifying crystal habit. However, past research suggests that inhibitors easily leach out from mortars, meaning their long-term positive effect is lost. Encapsulation of an inhibitor within a mortar is a potential solution to minimise leaching. Herein, capsules composed of a polyelectrolyte complex of calcium alginate coated in chitosan are investigated for the controlled diffusive release of sodium ferrocyanide, a known NaCl crystallisation inhibitor. Capsules with varying chitosan-calcium alginate ratios are prepared using the extrusion dripping technique. The release of the inhibitor from capsules in solutions of various pH values ranging from 7–13 is investigated. Results show that increasing the capsule’s chitosan to calcium alginate ratio reduces the inhibitor release for all studied solution pH values compared to pure calcium-alginate capsules. Therefore, a controlled inhibitor release can be obtained by tuning the chitosan-alginate ratio. In future, additional tests will be performed to find suitable capsule compositions for optimising their performance when mixed in mortars. |
| first_indexed | 2024-04-09T14:50:38Z |
| format | Article |
| id | doaj.art-18bed1a428e84d61a4fa70fd2b24feb3 |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-04-09T14:50:38Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-18bed1a428e84d61a4fa70fd2b24feb32023-05-02T09:34:12ZengEDP SciencesMATEC Web of Conferences2261-236X2023-01-013780201110.1051/matecconf/202337802011matecconf_smartincs2023_02011Tunable chitosan-alginate capsules for a controlled release of crystallisation inhibitors in mortarsKamat Ameya0Palin Damian1Lubelli Barbara2Schlangen Erik3Delft University of Technology, Heritage and TechnologyUniversity of Cambridge, Department of EngineeringDelft University of Technology, Heritage and TechnologyDelft University of Technology, Materials and EnvironmentPlasters and renders used in historic monuments are vulnerable to degradation caused by salt weathering. Crystallisation inhibitors (molecules/ions that alter salt crystallisation) mixed into mortars have shown promising results in mitigating salt damage by inhibiting salt crystallisation, promoting salt transport to the evaporating surface, and modifying crystal habit. However, past research suggests that inhibitors easily leach out from mortars, meaning their long-term positive effect is lost. Encapsulation of an inhibitor within a mortar is a potential solution to minimise leaching. Herein, capsules composed of a polyelectrolyte complex of calcium alginate coated in chitosan are investigated for the controlled diffusive release of sodium ferrocyanide, a known NaCl crystallisation inhibitor. Capsules with varying chitosan-calcium alginate ratios are prepared using the extrusion dripping technique. The release of the inhibitor from capsules in solutions of various pH values ranging from 7–13 is investigated. Results show that increasing the capsule’s chitosan to calcium alginate ratio reduces the inhibitor release for all studied solution pH values compared to pure calcium-alginate capsules. Therefore, a controlled inhibitor release can be obtained by tuning the chitosan-alginate ratio. In future, additional tests will be performed to find suitable capsule compositions for optimising their performance when mixed in mortars.https://www.matec-conferences.org/articles/matecconf/pdf/2023/05/matecconf_smartincs2023_02011.pdf |
| spellingShingle | Kamat Ameya Palin Damian Lubelli Barbara Schlangen Erik Tunable chitosan-alginate capsules for a controlled release of crystallisation inhibitors in mortars MATEC Web of Conferences |
| title | Tunable chitosan-alginate capsules for a controlled release of crystallisation inhibitors in mortars |
| title_full | Tunable chitosan-alginate capsules for a controlled release of crystallisation inhibitors in mortars |
| title_fullStr | Tunable chitosan-alginate capsules for a controlled release of crystallisation inhibitors in mortars |
| title_full_unstemmed | Tunable chitosan-alginate capsules for a controlled release of crystallisation inhibitors in mortars |
| title_short | Tunable chitosan-alginate capsules for a controlled release of crystallisation inhibitors in mortars |
| title_sort | tunable chitosan alginate capsules for a controlled release of crystallisation inhibitors in mortars |
| url | https://www.matec-conferences.org/articles/matecconf/pdf/2023/05/matecconf_smartincs2023_02011.pdf |
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