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Moriana Torro, Rosana
Publications (2 of 2) Show all publications
Requena, R., Jimenez-Quero, A., Vargas, M., Moriana Torro, R., Chiralt, A. & Vilaplana, F. (2019). Integral Fractionation of Rice Husks into Bioactive Arabinoxylans, llulose Nanocrystals, and Silica Particles. ACS Sustainable Chemistry and Engineering, 7(6), 6275-6286
Open this publication in new window or tab >>Integral Fractionation of Rice Husks into Bioactive Arabinoxylans, llulose Nanocrystals, and Silica Particles
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2019 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 7, no 6, p. 6275-6286Article in journal (Refereed) Published
Abstract [en]

Rice husk is an important agricultural by-product that has not been exploited yet to full capacity for advanced applications. The feasibility of obtaining high-value products such as bioactive hemicelluloses and cellulose nanocrystals (CNCs) from rice husk is here demonstrated in a cascade biorefinery process using subcritical water extraction (SWE) prior to bleaching and acid hydrolysis and compared to traditional alkali pretreatments. The proposed SWE process enables the isolation of bioactive arabinoxylans with phenolic acid moieties, thus preserving their antioxidant and anti- bacterial properties that are lost during alkaline conditions. Bioactive Additionally, SWE can be combined with subsequent arabinoxylan Silica particles bleaching and acid hydrolysis to obtain CNCs with large aspect ratio, high crystallinity, and thermal stability. The hydrothermal process also enables the recovery of silica particles that are lost during the alkali step but can be recovered after the isolation of the CNCs. Our biorefinery strategy results in the integral valorization of rice husk into their molecular components (bioactive arabinoxylans, cellulose nanocrystals, and silica particles), which can be used as additives for food applications and as reinforcing agents in biocomposite materials, respectively.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
Keywords
Rice husk, Subcritical water extraction, Xylans, Cellulose nanocrystals, Biorefinery
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-248332 (URN)10.1021/acssuschemeng.8b06692 (DOI)000461978200074 ()2-s2.0-85062832429 (Scopus ID)
Note

QC 20190410

Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-04-10Bibliographically approved
Mendoza Alvarez, A. I., Moriana Torro, R., Hillborg, H. & Strömberg, E. (2019). Super-hydrophobic zinc oxide/silicone rubber nanocomposite surfaces. SURFACES AND INTERFACES, 14, 146-157
Open this publication in new window or tab >>Super-hydrophobic zinc oxide/silicone rubber nanocomposite surfaces
2019 (English)In: SURFACES AND INTERFACES, ISSN 2468-0230, Vol. 14, p. 146-157Article in journal (Refereed) Published
Abstract [en]

This study presents comparative assessments on hydrophilic and hydrophobic ZnO nanoparticles and their deposition methods on the surface hydrophobicity of silicone rubber (PDMS) and glass substrates. The influence on the surface hydrophobicity and wettability of all the variables regarding the deposition methodologies and the interaction of the nanoparticles with the substrates were within the scope of this study. The different surfaces created by spraying, dipping and drop-pipetting deposition methods were assessed by static contact angle measurements and contact angle hysteresis from advancing and receding angles, as well as by the calculation of the sliding angle and the surface energy parameters. An accurate methodology to determine the contact angle hysteresis was proposed to obtain repetitive and comparative results on all surfaces. All the measurements have been correlated with the morphology and topography of the different surfaces analysed by FE-SE microscopy. The spray-deposition of hydrophobic ZnO nanoparticles on PDMS resulted in super-hydrophobic surfaces, exhibiting hierarchical structures with micro-and nanometer features which, together with the low surface energy, promotes the Cassie-Baxter wetting behavior. This study provides the fundamental approach to select critically the most promising combination in terms of materials and deposition techniques to create silicone-based super-hydrophobic surfaces with potential to be applied in high voltage outdoor insulation applications.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2019
Keywords
Super-hydrophobicity, Self-cleaning surface, PDMS, ZnO nanoparticles, Nanocomposite surfaces, High-voltage insulator
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-246243 (URN)10.1016/j.surfin.2018.12.008 (DOI)000459836200019 ()2-s2.0-85058703161 (Scopus ID)
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-04Bibliographically approved
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