All Outputs (9)

Preparation of Elastomeric Nanocomposites Using Nanocellulose and Recycled Alum Sludge for Flexible Dielectric Materials (2022)
Journal Article
Sun, D., Saw, B. L., Onyianta, A. J., Wang, B., Wilson, C., O'Rourke, D., …Lu, Z. (2023). Preparation of Elastomeric Nanocomposites Using Nanocellulose and Recycled Alum Sludge for Flexible Dielectric Materials. Journal of Advanced Dielectrics, 13(01), Article 2242008. https://doi.org/10.1142/s2010135x22420085

Flexible dielectric materials with environmental-friendly, low-cost and high-energy density characteristics are in increasing demand as the world steps into the new Industrial 4.0 era. In this work, an elastomeric nanocomposite was developed by incor... Read More about Preparation of Elastomeric Nanocomposites Using Nanocellulose and Recycled Alum Sludge for Flexible Dielectric Materials.

Processing and characterisation of water hyacinth cellulose nanofibres-based aluminium-ion battery separators (2021)
Conference Proceeding
Beg, M., Sun, D., Popescu, C., Alcock, K. M., Onyianta, A. J., O'Rourke, D., …Yu, H. (2021). Processing and characterisation of water hyacinth cellulose nanofibres-based aluminium-ion battery separators. In 2021 26th International Conference on Automation and Computing (ICAC). https://doi.org/10.23919/icac50006.2021.9594191

Water hyacinth is an invasive plant that can be converted to high value cellulose nanofibers. This study presents battery separators prepared from water hyacinth cellulose nanofibres (WHCNF) via a freeze-thawing crosslinking method, using polyethylen... Read More about Processing and characterisation of water hyacinth cellulose nanofibres-based aluminium-ion battery separators.

High aspect ratio cellulose nanofibrils from macroalgae Laminaria hyperborea cellulose extract via a zero-waste low energy process (2020)
Journal Article
Onyianta, A. J., O’Rourke, D., Sun, D., Popescu, C., & Dorris, M. (2020). High aspect ratio cellulose nanofibrils from macroalgae Laminaria hyperborea cellulose extract via a zero-waste low energy process. Cellulose, 27(14), 7997-8010. https://doi.org/10.1007/s10570-020-03223-5

Homogeneous high aspect ratio cellulose nanofibrils (CNFs) were prepared from Laminaria hyperborea (LH) seaweed cellulose without any initial mechanical, biological or chemical pre-treatments. Fourier-transform infrared spectrophotometry revealed tha... Read More about High aspect ratio cellulose nanofibrils from macroalgae Laminaria hyperborea cellulose extract via a zero-waste low energy process.

A process for deriving high quality cellulose nanofibrils from Water hyacinth invasive species (2020)
Journal Article
Sun, D., Onyianta, A. J., O’Rourke, D., Perrin, G., Popescu, C., Saw, L. H., …Dorris, M. (2020). A process for deriving high quality cellulose nanofibrils from Water hyacinth invasive species. Cellulose, 27, 3727-3740. https://doi.org/10.1007/s10570-020-03038-4

In this study, surface chemistry, the morphological properties, water retention values, linear viscoelastic properties, crystallinity index, tensile strength and thermal properties of water hyacinth (WH) cellulose were correlated with the degree of m... Read More about A process for deriving high quality cellulose nanofibrils from Water hyacinth invasive species.

Surface Functionality in Nanocellulose Processing and Composite Formulations (2019)
Thesis
Onyianta, A. Surface Functionality in Nanocellulose Processing and Composite Formulations. (Thesis). Edinburgh Napier University. Retrieved from http://researchrepository.napier.ac.uk/Output/2025207

Cellulose nanofibrils (CNF) are cellulose nanomaterials with desirable properties and offer great potentials to be applied in diverse fields. While various pre-treatments have been studied with the aim of reducing the intensity of mechanical fibrilla... Read More about Surface Functionality in Nanocellulose Processing and Composite Formulations.

High-shear rate rheometry of micro-nanofibrillated cellulose (CMF/CNF) suspensions using rotational rheometer (2018)
Journal Article
Vadodaria, S. S., Onyianta, A. J., & Sun, D. (2018). High-shear rate rheometry of micro-nanofibrillated cellulose (CMF/CNF) suspensions using rotational rheometer. Cellulose, 25(10), 5535-5552. https://doi.org/10.1007/s10570-018-1963-4

Suspensions of cellulose micro- and nanofibrils are widely used in coatings, fibre spinning, 3D printing and as rheology modifiers where they are frequently exposed to shear rates > 104 s−1, often within small confinements. High-shear rate rheologica... Read More about High-shear rate rheometry of micro-nanofibrillated cellulose (CMF/CNF) suspensions using rotational rheometer.

The Effects of morpholine pre-treated and carboxymethylated cellulose nanofibrils on the properties of alginate-based hydrogels (2018)
Journal Article
Onyianta, A. J., Castellano, M., Dorris, M., Williams, R. L., & Vicini, S. (2018). The Effects of morpholine pre-treated and carboxymethylated cellulose nanofibrils on the properties of alginate-based hydrogels. Carbohydrate Polymers, 198, 320-327. https://doi.org/10.1016/j.carbpol.2018.06.084

The effects of varying percentage loadings of morpholine pre-treated cellulose nanofibrils (MCNF) and carboxymethylated cellulose nanofibrils (CMCNF) on the aqueous swelling, compressive modulus and viscoelastic properties of calcium-ion-crosslinked... Read More about The Effects of morpholine pre-treated and carboxymethylated cellulose nanofibrils on the properties of alginate-based hydrogels.

Aqueous morpholine pre-treatment in cellulose nanofibril (CNF) production: comparison with carboxymethylation and TEMPO oxidisation pre-treatment methods (2017)
Journal Article
Onyianta, A. J., Dorris, M., & Williams, R. (2017). Aqueous morpholine pre-treatment in cellulose nanofibril (CNF) production: comparison with carboxymethylation and TEMPO oxidisation pre-treatment methods. Cellulose, https://doi.org/10.1007/s10570-017-1631-0

In this study, pulped cellulose fibres were pre-treated with aqueous morpholine prior to mechanical disruption in the production of cellulose nanofibrils (CNF). The properties of the morpholine pre-treated CNF (MCNF) were closely compared with CNF ob... Read More about Aqueous morpholine pre-treatment in cellulose nanofibril (CNF) production: comparison with carboxymethylation and TEMPO oxidisation pre-treatment methods.

The Use of Sedimentation for the Estimation of Aspect Ratios of Charged Cellulose Nanofibrils (2017)
Conference Proceeding
Onyianta, A. J., & Williams, R. (2018). The Use of Sedimentation for the Estimation of Aspect Ratios of Charged Cellulose Nanofibrils. In R. Fangueiro, & S. Rana (Eds.), Advances in Natural Fibre Composites (195-203). https://doi.org/10.1007/978-3-319-64641-1_17

In this study, the aspect ratios of carboxymethylated and TEMPO-oxidised cellulose nanofibrils (CNF) were estimated by gel point analysis using a sedimentation approach. The flocculation and subsequent sedimentation of the CNF aqueous suspensions, wh... Read More about The Use of Sedimentation for the Estimation of Aspect Ratios of Charged Cellulose Nanofibrils.