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    Preparação e avaliação de membranas de celulose com propriedades condutoras e microbicidas
    (Universidade Federal de São Paulo (UNIFESP), 2020-06-02) Oliveira, Roselaine Da Silva [UNIFESP]; Camilo, Fernanda Ferraz [UNIFESP]; Universidade Federal de São Paulo
    There is a growing interest in developing methods that allow the immobilization of different types of materials (polymers and nanomaterials) in biopolymers. Among them, cellulose (CEL) is of the most indicated because it is natural, abundant, and non-toxic. In this thesis, new methods of immobilizing a conductive polymer and silver nanoparticles on cellulose membranes were developed. In order to overcome the insolubility and difficult processing of cellulose, in these procedures the biopolymer was dissolved in an ionic liquid called 1-butyl-3-methylimidazolium chloride (BMImCl). To simplify the comprehension of this thesis, it was divided into three chapters. In the first chapter (CHAPTER 1), the preparation of electrically conductive cellulose membranes, containing silver nanoparticles and polyaniline (PANI), which is a conductive polymer, will be shown. These membranes (CEL / PANI / Ag) showed high electrical conductivity and catalytic activity toward the reduction of p-nitrophenol. In the second chapter (CHAPTER 2), the preparation of several aqueous and non-aqueous dispersions (1-butanol) of silver nanoparticles (AgNP) with high metal concentration will be presented. A simple and fast method was developed, under mild reaction conditions. The dispersions presented excellent microbicidal activities. In the third chapter (CHAPTER 3) a new method of immobilizing the dispersions of AgNP produced in chapter 2 on cellulose membranes will be presented. These membranes will have their microbiological activity evaluated. An illustration of the chapters of thesis is in Figure 1.