In the field, hollow microcapsules with nanometer thin shells have been prepared by a sequential deposition of polymers and/or nanoparticles on different destructible substrates, e.g. dissolvable microparticles or at the liquid/gas interface. To make these capsules industrial interesting, reducing the number of deposition layers together with avoiding capsule collapse upon drying is a necessity. We show that this can be achieved by adsorbing the strong and renewable cellulose nanofibrils (NFC), anionically and cationicaly modified, on to dissolvable particles. In addition, to increase the shell toughness, the elastic biopolymer xyloglucan (XG) is deposited between each NFC layer. This combination of NFC and XG enables production of shells after only a few deposition layers, withstanding core removal and drying.

Preparation of ultrathin cellulose nanofibril-based hollow capsules using layer-by-layer deposition

245th National Meeting (2013)

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