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Contact-active antibacterial aerogels from cellulose nanofibrils.pdf
Colloids and Surfaces B: Biointerfaces 146 (2016) 415–422
Contents lists available at ScienceDirect
Colloids and Surfaces B: Biointerfaces
journal homepage: /locate/colsurfb
Contact-active antibacterial aerogels from cellulose nano?brils
Jonatan Henschen ?, Jose?n Illerg?rd, Per A. Larsson, Monica Ek, Lars W?gberg ?
Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44 Stockholm, Sweden
article info
Article history: Received 25 February 2016 Received in revised form 26 May 2016 Accepted 18 June 2016 Available online 19 June 2016
Keywords: Antibacterial Cellulose nano?brils Aerogel Contact active Polymer adsorption
abstract
The use of cellulose aerogels as antibacterial materials has been investigated by applying a contactactive layer-by-layer modi?cation to the aerogel surface. Studying the adsorption of multilayers of polyvinylamine (PVAm) and polyacrylic acid to aerogels comprising crosslinked cellulose nano?brils and monitoring the subsequent bacterial adhesion revealed that up to 26 mg PVAm g aerogel?1 was adsorbed without noticeably affecting the aerogel structure. The antibacterial effect was tested by measuring the reduction of viable bacteria in solution when the aerogels were present. The results show that 99.9% of the bacteria adhered to the surface of the aerogels. Microscopy further showed adherence of bacteria to the surfaces of the modi?ed aerogels. These results indicate that it is possible to create materials with three-dimensional cellulose structures that adsorb bacteria with very high ef?ciency utilizing the high speci?c surface area of the aerogels in combination with their open structure.
? 2016 Elsevier B.V. All rights reserved.
1. Introduction
Cellulose is an abundant biopolymer used in a wide range of everyday products such as packaging and hygiene and healthcare products. Most cellulose-based products have traditionally been ?at, thin materials based on partly or totally deligni?ed woodbase
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