TEMPO oxidation and high-speed blending as a combined approach to disassemble bacterial cellulose
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The aim of this study was to obtain bacterial cellulose (BC) nanofibrils by using a high speed blender on BC previously oxidized with 2,2,6,6-tetramethyl-1-piperidinoxyl (TEMPO) radical. The resulting oxidized nanofibrillated bacterial cellulose (BCOXNF) was characterized chemically, thermally, and morphologically, presenting high crystallinity index (92%), great dispersion stability (zeta potential, − 52 mV) and appropriate morphology (40 nm in diameter). In addition, freeze dried nanofibrils were evaluated for their redispersibility in water, in order to check whether the process was effective in preventing hornification (nanofibril aggregation upon drying). In fact, the obtained material presented better redispersibility in water (zeta potential, − 63 mV) after freeze drying when compared to non-oxidized BC.
KeywordsBacterial cellulose TEMPO Cellulose nanofibrils Oxidation
The authors gratefully acknowledge the financial support of the Empresa Brasileira de Pesquisa Agropecuária (Embrapa, 02.14.03.012.00.00 and 03.14.04.007.00.00) and the Ceará Foundation for the Support of Scientific and Technological Development (FUNCAP, PR2-0101-00023.01.00/15), as well as the Ceará Federal Institute (IFCE) for the FTIR analyses, and Celli R. Muniz (Embrapa Agroindustria Tropical) for the SEM analyses. They also thank FUNCAP (PEP-0094-0001.01.37/14, BMD-008-00350.01.04/14), CAPES (2017SLR-17925), and the CNPq (145098/2016-8, 129977/2014-4) for the scholarships granted to authors Nascimento, Lima, Pereira, Barros, and Barroso respectively. Feitosa thanks INCT-INOMAT. Authors Azeredo and Rosa thank CNPq for their Research Productivity fellowships (302381/2016-3 and 305504/2016-9 respectively).
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