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Sound absorption properties of porous composites fabricated by a hydrogel templating technique

Published online by Cambridge University Press:  29 July 2013

Marius Rutkevičius ,
Georg H. Mehl ,
Vesselin N. Paunov ,
Qin Qin ,
Philip A. Rubini ,
Simeon D. Stoyanov  and
Jordan Petkov
Marius Rutkevičius*
Affiliation:
Department of Chemistry, The University of Hull, Hull, HU6 7RX, United Kingdom
Georg H. Mehl
Affiliation:
Department of Chemistry, The University of Hull, Hull, HU6 7RX, United Kingdom
Vesselin N. Paunov*
Affiliation:
Department of Chemistry, The University of Hull, Hull, HU6 7RX, United Kingdom
Qin Qin
Affiliation:
The Acoustics Research Centre, School of Engineering, The University of Hull, Hull, HU6 7RX, United Kingdom
Philip A. Rubini
Affiliation:
The Acoustics Research Centre, School of Engineering, The University of Hull, Hull, HU6 7RX, United Kingdom
Simeon D. Stoyanov
Affiliation:
Unilever R&D Vlaardingen, 3133 AT, Vlaardingen, The Netherlands; and Laboratory of Physical Chemistry and Colloid Science, Wageningen University, 6703 HB Wageningen, The Netherlands; and Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, United Kingdom
Jordan Petkov
Affiliation:
DP4-8A, Unilever Discover Port Sunlight, Bebington, Wirral, CH63 3JW, United Kingdom
*
a)Address all correspondence to these authors. e-mail: M.Rutkevicius@hull.ac.uk
b)e-mail: V.N.Paunov@hull.ac.uk
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Abstract

We have used a hydrogel templating technique followed by the subsequent evaporation of water present to fabricate porous cement and porous PDMS composites, and we have analyzed their sound absorption properties. All experiments were carried out with hydrogel slurries of broad bead size distributions. Porous PDMS and cement composites were produced with porosities of up to 80% and 70%, respectively. Scanning electron microscope analysis shows fibrous domains within the voids created by the hydrogel in the cement samples and open pore network in the PDMS composites of initial hydrogel content higher than 70 vol%. Sound absorption was improved with respect to control nonporous samples in all composites with porosities higher than 60 vol%, where an open pore structure was formed. The porous PDMS and porous cement produced by this method show better sound absorption at 200–400 Hz and 1200–1800 Hz frequency ranges when compared with the sound absorption in the intermediate frequencies range between 400 and 1000 Hz.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 17: Focus Issue: Advances in the Synthesis, Characterization, and Properties of Bulk Porous Materials , 14 September 2013 , pp. 2409 - 2414
Copyright
Copyright © Materials Research Society 2013 

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References

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