Dataset for ''Stable cellulose nanofibril microcapsules from Pickering emulsion templates''

We used cationized cellulose nanofibrils (CCNF)-stabilized Pickering emulsions (PE) as templates, and the electrostatic interactions were induced by adding the oxidized cellulose nanofibrils (OCNF) at the oil/water interface to form sustainable microcapsules (MCs). The oppositely charged cellulose nanofibrils enhanced the solidity of interfaces allowing the encapsulation of Nile red (NR) dye in sunflower oil droplets. This dataset provides the raw data of the dye release study from these MCs under different conditions, such as through diffusion, centrifugation and mechanical stirring at various pH environments.

Keywords:
Pickering emulsions, encapsulation, microcapsules, cellulose nanofibrils
Subjects:
Materials sciences
Medical and health interface

Cite this dataset as:
Shi, H., Hossain, Z., Califano, D., Callaghan, C., Ekanem, E., Scott, J., Mattia, D., Edler, K., 2022. Dataset for ''Stable cellulose nanofibril microcapsules from Pickering emulsion templates''. Bath: University of Bath Research Data Archive. Available from: https://doi.org/10.15125/BATH-01110.

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Data

Dataset.zip
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Creative Commons: Attribution 4.0

This dataset contains the raw data of the dye release study, zeta potential and diameter of the microcapsules prepared using oppositely charged cellulose particles.

Creators

Hui Shi
University of Bath

Zakir Hossain
University of Bath

Ekanem Ekanem
University of Bath

Janet L Scott
University of Bath

Davide Mattia
University of Bath

Karen Edler
University of Bath

Contributors

University of Bath
Rights Holder

Documentation

Data collection method:

Quantification of Nile red (NR) release: For the dye release study, NR was dissolved in SFO at a weight fraction of 0.00275 wt%. The Pickering emulsions and various microcapsules (1st, 2nd and 3rd MCs) were prepared in a 50 mL centrifuge tube (Falcon). Then, 5 mL of pure sunflower oil (NR-free) was added carefully on the top of the PE and MCs (10 mL) suspension along the tube wall. These were then stored at room temperature, allowing for any NR to diffuse from the PE or MCs phase to the top oil layer. The absorbance of the upper oil layer was measured using a UV-Visible spectrophotometer (Agilent 8453) at 520 nm after 1 and 7 days. The NR released was calculated from the calibration curve, and the percentage of dye release with respect to its initial concentration reported. Dye release studies were also conducted under different applied force fields, namely centrifugation and mechanical stirring at room temperature. In the case of centrifugation, the above-mentioned PE and MCs (10 mL of sample + 5 mL of dye-free fresh oil) were centrifuged at 8000 rpm for 10 min and then allowed to diffuse for 1 and 7 days before taking the absorbance of the upper oil layer at 520 nm. For mechanical stirring studies, the samples were stirred at 2000 rpm for 10 min using an overhead stirrer (propeller dimension 14.5 mm x 12 mm and Falcon tube internal diameter ~27 mm) and then allowed to diffuse for 1 and 7 days. To separate the oil layer from the blend, a short centrifugation (8000 rpm for 2 min) was done after 1 and 7 days just before the absorbance measurement. In addition, a dye release study on the most stable MCs (3rd MCs) was done in different pH environments (4.0, 5.0, 6.5 and 8.5). The pH of the as-prepared MCs was ~6.5 (without any adjustment); therefore, the lower and higher pH values were obtained using HCl (0.1 M) and NaOH (0.1 M) solution, respectively. All dye release experiments were repeated in triplicate and error bars report the standard deviation for each data point. Surface charge: The ζ-potential of the OCNF (0.05 wt%), CCNF(0.05 wt%), PE and MCs suspensions was measured using a Zetasizer (Malvern Zetasizer Nano ZSP®, UK). PE/MC samples (100 µL) were diluted using DI water (900 µL) before the measurement. The samples (~850 µL) were injected in the folded capillary electrode cell and equilibrated at 25 oC for 120 s before measuring as an average of 5 from 100 scans each. The ζ-potential was calculated using Henry's law utilizing the Smoluchowski model loaded in the Zetasizer software (Malvern). Microcapsule diameter: The diameter of microcapsules was measured from the optical micrograph images using ImageJ software.

Funders

Engineering and Physical Sciences Research Council (EPSRC)
https://doi.org/10.13039/501100000266

Biodegradable Microbeads and Microspheres
EP/P027490/1

Publication details

Publication date: 23 February 2022
by: University of Bath

Version: 1

DOI: https://doi.org/10.15125/BATH-01110

URL for this record: https://researchdata.bath.ac.uk/id/eprint/1110

Related papers and books

Shi, H., Hossain, K. M. Z., Califano, D., Callaghan, C., Ekanem, E. E., Scott, J. L., Mattia, D., and Edler, K. J., 2022. Stable Cellulose Nanofibril Microcapsules from Pickering Emulsion Templates. Langmuir, 38(11), 3370-3379. Available from: https://doi.org/10.1021/acs.langmuir.1c03025.

Contact information

Please contact the Research Data Service in the first instance for all matters concerning this item.

Contact person: Zakir Hossain

Departments:

Faculty of Science
Chemistry

Research Centres & Institutes
Centre for Sustainable and Circular Technologies (CSCT)