Novel In-situ Precipitation Process to Engineer Low Permeability Porous Composite

Scientific Reports
Swambabu VaranasiWarren Batchelor

Abstract

Inspired by the natural precipitation of minerals in soil and rocks, a novel, simple and industrially scalable in-situ precipitation process to produce low permeability porous composites is presented. This process relies on capillary flow in wettable porous composites to absorb and store liquid. In this process, a porous composite first absorbs a salt solution, after which the composite is dipped in a second salt solution. Salts are selected such as they react to form an insoluble precipitate. As big pores absorb more liquid than small pores, the precipitated particles are formed specifically for each pore. In this paper, precipitation of CaCO3 nanoparticles in cellulose nanofibre (CNF) films was demonstrated as an example. Precipitation of 1 wt% of CaCO3 nanoparticles in the CNF film reduced the pore volume by 50%, without changing the density. This reduced the water vapour and oxygen transmission rates by one order of magnitude to 4.7 g/m2.day and 2.7 cc/m2.day, respectively. The barrier properties of in-situ precipitated composites showed superior performance to previously reported CNF films in literature. The concept is general and of very high industrial interest as it can easily be retrofitted to current continuous indust...Continue Reading

References

Feb 24, 2011·Biomacromolecules·Hongyang MaBenjamin Chu
May 10, 2012·Biomacromolecules·Chun-Nan WuAkira Isogai
Apr 12, 2013·Nanoscale·Masaya NogiKatsuaki Suganuma
Mar 10, 2015·Materials Science & Engineering. C, Materials for Biological Applications·M Isabel González-SánchezPolina Prokopovich
May 1, 2015·Comprehensive Reviews in Food Science and Food Safety·Atefe RezaeiMilad Fathi

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Citations

Nov 9, 2019·ACS Applied Materials & Interfaces·Oriol CusolaM Blanca Roncero

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Methods Mentioned

BETA
membrane filtration
Scanning Electron Microscopy

Software Mentioned

ImageJ
Image J

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