Giedrius Janusas – författare

In recent years, various technologies dedicated to the formation of micro- and nanostructures have been intensively developed. Microstructures and nanostructures are manufactured from various materials with different parameters in a wide range of industrial sectors. These structures are used in devices such as biosensors, optical devices, microfluidic devices, electronic components, fluid mixing devices, particle separation or mixing devices, and single-molecule analysis devices. In this book technologies are being developed for the formation of nano/micro structures that allow the creation of new types of functional elements used in bioengineering. A magnetostrictive converter was developed and studied for the formation of microstructures in polymers, and a newly developed technology using mechanical vibrations during the chemical process was used to form aluminum nanopores. The synergy of these two technologies ensures the creation of a new type of functional elements used in bioengineering. It is presented how to replace the piezoelectric transducer with a magnetostrictive transducer in order to improve hot embossing technology for formation microstructures in polymers. The improved transducer would not only allow for the formation of structures at higher temperatures but would also eliminate the need for an additional heating element which generates a significant amount of heat during the process, thus optimising the device. The important aspects of this system include determining the working parameters of the structure formation which affect the quality and reproducibility of the structures. Research related to nanostructured nanoporous membranes has been receiving a lot of attention from scientists and businesspeople, which is why it is important to develop technologies and deepen knowledge about the chemical and physical processes that take place during fabrication to solve the challenges related to nanostructured membranes. Having it in mind this book presents a novel fabrication technology of nanoporous AAO membranes using vibrations, including production processes, their parameters, and a description of the properties of the fabricated membranes. Moreover, the book presents a technology for replicating the geometry of the AAO membrane in a biocompatible chitosan membrane, when nanopillars are formed on the surface of the chitosan membrane. It also presents the relationships and interactions studied between various parameters, which is achieved by presenting sets of experimental results. Combining these technologies the manufacturing of functional elements and their application to bioengineering. The book will be useful for researchers not only in Mechanical Engineering but also for Material Science and Chemical Engineering. It could be used for master and Ph.D. students too.

This book brings together a collection of groundbreaking research papers, offering an in-depth exploration of the latest developments, methodologies, and future possibilities of natural fiber composites in the dynamic field of materials science and engineering. Within these pages, it discovers the intricate world of fabrication techniques for hybrid composites based on natural fibers and various matrix materials. This book unravels the secrets behind the enhanced mechanical properties of natural fiber hybrids, showcasing remarkable tensile strength, flexural strength, and modulus improvements. It explores the impact of alkaline treatments on the mechanical properties of reinforcement materials through detailed morphological studies and FTIR analyses. Comparative studies between epoxy-matrix-based and EcoPoxy (Bio resin) matrix-based hybrid composites reveal intriguing insights, while investigations into basalt and E-glass woven-fiber-based epoxy hybrid composites with graphite filler material showcase superior mechanical properties. Moreover, this book goes beyond presenting findings; it sets the stage for future research. Proposals for further investigations include exploring diverse chemical treatments for natural fibers, studying the effects of various filler materials, analyzing moisture absorption behavior, and expanding the application scope of natural fiber hybrid composites. Whether you''re an experienced researcher, an engineering enthusiast, or a student entering the captivating realm of materials science, this book will be a valuable resource. This book takes a profound journey into the advancements, challenges, and potential applications of natural fiber hybrid composites, shaping the future of sustainable engineering solutions and innovative materials with advancements in natural fiber hybrid composites.

This book presents the most important aspects of analysis of dynamical processes taking place on the human body surface. It provides an overview of the major devices that act as a prevention measure to boost a person‘s motivation for physical activity. A short overview of the most popular MEMS sensors for biomedical applications is given. The development and validation of a multi-level computational model that combines mathematical models of an accelerometer and reduced human body surface tissue is presented. Subsequently, results of finite element analysis are used together with experimental data to evaluate rheological properties of not only human skin but skeletal joints as well. Methodology of development of MOEMS displacement-pressure sensor and adaptation for real-time biological information monitoring, namely “ex vivo” and “in vitro” blood pulse type analysis, is described. Fundamental and conciliatory investigations, achieved knowledge and scientific experience about biologically adaptive multifunctional nanocomposite materials, their properties and synthesis compatibility, periodical microstructures, which may be used in various optical components for modern, productive sensors‘ formation technologies and their application in medicine, pharmacy industries and environmental monitoring, are presented and analyzed. This book also is aimed at research and development of vibrational energy harvester, which would convert ambient kinetic energy into electrical energy by means of the impact-type piezoelectric transducer. The book proposes possible prototypes of devices for non-invasive real-time artery pulse measurements and micro energy harvesting.