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Mendoza, Ana
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Publications (2 of 2) Show all publications
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
Mendoza, A., Hillborg, H. & Strömberg, E. (2015). Superhydrophobic self-regenerative silicone rubber nanocomposites for electrical outdoor insulation. In: ICCM International Conferences on Composite Materials: . Paper presented at 20th International Conference on Composite Materials, ICCM 2015, 19 July 2015 through 24 July 2015. International Committee on Composite Materials
Open this publication in new window or tab >>Superhydrophobic self-regenerative silicone rubber nanocomposites for electrical outdoor insulation
2015 (English)In: ICCM International Conferences on Composite Materials, International Committee on Composite Materials , 2015Conference paper, Published paper (Refereed)
Abstract [en]

The overall objective of this project is to develop new structural composite materials for high voltage outdoor insulation applications using silicone rubber (PDMS) coated with micro- and nanoparticles. The goal is to obtain hierarchical superhydrophobic surfaces, with antifogging, antifouling and self-cleaning ability. This will minimize surface leakage currents and subsequent surface flash over of the insulator. In order to achieve both the superhydrophobic and self-cleaning ability, a combination of different surface chemistry of the particles has been investigated. Three different deposition techniques, including spraying of ROD ultrasonicated ZnO suspensions were investigated. Pure silicone rubber (SYLGARD® 184) was coated with hydrophobic and hydrophilic inorganic micro- and nanoparticles (ZnO). The effect of the different factors, such as particle surface chemistry and the deposition method, on the hydrophobicity of the surface has been investigated using static and dynamic contact angle measurements. The objective has been to achieve the highest static contact angle combined with the lowest possible hysteresis. The results showed that the spraying method was more suitable when using PDMS as matrix. The link between superhydrophobicity and the surface structure has been assessed by Scanning Electron Microscopy. The next step towards a self-regenerative composite material is approached by the incorporation of the optimal functionalised nanoparticles into the bulk material. The dynamic behaviour of silicone rubber presents a challenge for the stability of micro- and nanocomposites. Different mechanical techniques and methods of integration are being investigated for improvement of the homogeneity of the composites. Preliminary studies have been performed evaluating the effect of the curing time of the PDMS on the degree of incorporation of the nanoparticles in the surface and uniformity within the bulk. The behaviour of the nanocomposite and the evolution of the different properties with time and environmental conditions will be studied in the next phase of the project. 

Place, publisher, year, edition, pages
International Committee on Composite Materials, 2015
Keywords
Nanocomposites, PDMS, Self-regenerative, Superhydrophobic, ZnO
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-236918 (URN)2-s2.0-85053104760 (Scopus ID)
Conference
20th International Conference on Composite Materials, ICCM 2015, 19 July 2015 through 24 July 2015
Funder
Swedish Energy Agency
Note

Funding text: Financial support given by Energimyndigheten, Elforsk and ABB Corporate Research Center through the Elektra program is gratefully acknowledged.

QC 20181211

Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2018-12-11Bibliographically approved
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