Fundação de Amparo a Pesquisa no Estado do Rio Grande do Sul / The development of products with antimicrobial, inhibitory or even lethal action has attracted considerable attention in widely different research and applications fields. The present work studies the obtaining of an antimicrobial material derived from activated carbon submitted to adsorption in a medium with silver ions. It s divided into five chapters, dealing respectively of: introduction (subject s delimitation; research objectives; study s structure); literature review (antimicrobial materials, metal ions, activated carbon impregnated with silver (ACIS); ACIS s details of obtaining and applications); materials and methods (type of research, experiments, characterization tests); results and discussions and conclusions. To characterize the material obtained, in addition to the surface area analysis, inhibitory and bactericidal effects of the samples were evaluated by microbiological testing with different bacteria. About the experimental methodology, it was tested the effects of the silver ions impregnated on coal in cultures of bacteria Escherichia coli and Staphylococcus aureus from different strains. These effects were evaluated by minimum inhibitory concentration and minimum bactericidal concentration tests. The results for the material obtained confirmed the action of silver as an important antibacterial agent. / O desenvolvimento de produtos com ação antimicrobiana, inibitória ou mesmo letal, tem atraído considerável atenção nos mais distintos campos de pesquisa e aplicações. O objetivo deste estudo foi obter um material antimicrobiano a partir de carvão ativado submetido à adsorção em um meio com íons de prata. O trabalho está dividido em cinco capítulos, tratando respectivamente de: introdução (delimitação do tema; objetivos da pesquisa; estrutura do estudo); fundamentação teórica (materiais antimicrobianos; íons metálicos; carvão ativado impregnado com prata (CAIP); detalhes de obtenção e aplicações do CAIP); materiais e métodos (tipo de pesquisa; experimentos; testes de caracterização); resultados e discussões e considerações finais da autora. Para a caracterização do material obtido, além de análise de área superficial, avaliaram-se os efeitos inibitório e bactericida das amostras através de testes microbiológicos com diferentes bactérias. Quanto à metodologia experimental aplicada, foram testados os efeitos da presença de íons de prata no carvão em culturas de bactérias Escherichia coli e Staphylococcus aureus de diferentes cepas. Tais efeitos foram avaliados através de testes de concentração mínima inibitória e concentração mínima bactericida. Os resultados referentes ao material obtido confirmaram a ação da prata como um importante agente antibacteriano.

<p>  </p> <p>Printed electronics (PE) is one of the fastest growing technologies in the 21^st century. Recent reports have shown that PE market will reach 4.9 billion by 2032. PE refers to additive deposition of materials to fabricate electrical circuits, interconnects, and devices. </p> <p>The quest for developing nondestructive processes that enables additive manufacturing of low-cost PEs on heat-sensitive substrates with novel functionalities has resulted in several recent developments in the field which includes investigation of selective and optical sintering processes such as photonic sintering and laser sintering, to name a few. Broadly, this dissertation is an effort to study these sintering technologies for additive manufacturing of bimodal (metal/metal, metal/inorganic, and metal/organic) printed material compositions.  </p> <p>In the first section, nondestructive sintering technologies is combined with chemical sintering to develop bimodal metallic conductive pastes for the fabrication of biodegradable and non-biodegradable printed devices for applications in food packaging and wireless smart drug delivery.</p> <p>Next, a process is developed via near-infrared (NIR) technology to enable soldering and mounting electrical components onto printed materials using low-temperature bimodal metal/organic solder pastes. The developed optimized process is used to fabricate a flexible printed hybrid device for remote assessment of the wound exudate absorption in dressings.</p> <p>Lastly, laser processing is used to fabricate an antibacterial bimodal silver containing glass ceramics coating directly on temperature-sensitive polymeric surgical meshes. The integrated bioceramic coating on the mesh exhibits long-lasting antibacterial properties against Gram-positive and Gram-negative strains of bacteria. </p> <p>The results of this dissertation will open a new route of research to fabricate low-cost devices with bimodal materials with applications in medical device, healthcare, and packaging industries. </p> <p><br></p>