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21	Electromechanical Behavior of Chemically Reduced Graphene Oxide and Multi-walled Carbon Nanotube Hybrid Material Benchirouf, Abderrahmane, Müller, Christian, Kanoun, Olfa 14 May 2016 (has links) In this paper, we propose strain-sensitive thin films based on chemically reduced graphene oxide (GO) and multi-walled carbon nanotubes (MWCNTs) without adding any further surfactants. In spite of the insulating properties of the thin-film-based GO due to the presence functional groups such as hydroxyl, epoxy, and carbonyl groups in its atomic structure, a significant enhancement of the film conductivity was reached by chemical reduction with hydro-iodic acid. By optimizing the MWCNT content, a significant improvement of electrical and mechanical thin film sensitivity is realized. The optical properties and the morphology of the prepared thin films were studied using ultraviolet-visible spectroscopy (UV-Vis) and scanning electron microscope (SEM). The UV-Vis spectra showed the ability to tune the band gap of the GO by changing the MWCNT content, whereas the SEM indicated that the MWCNTs were well dissolved and coated by the GO. Investigations of the piezoresistive properties of the hybrid nanocomposite material under mechanical load show a linear trend between the electrical resistance and the applied strain. A relatively high gauge factor of 8.5 is reached compared to the commercial metallic strain gauges. The self-assembled hybrid films exhibit outstanding properties in electric conductivity, mechanical strength, and strain sensitivity, which provide a high potential for use in strain-sensing applications. info:eu-repo/classification/ddc/539 ddc:539 info:eu-repo/classification/ddc/542 ddc:542
22	Sustainable water treatment processes : Scenarios for a better environment in Håbo municipality / Hållbar vattenreningsprocess : Scenarion för en bättre omgivning i Håbo kommun Trozell, Oskar, Wiman, Daniel, Wiggins, Elis, Stigenberg, Elin, Bergström, Alva, Andersson, Emilia January 2021 (has links) Clean drinking water is a vital part of our society and a basic human right. With an ever growing population and a decreasing quality of raw water, new methods need to be introduced to keep up with the demand for clean, biostable, and sustainable production of drinking water. The aim of this study is to evaluate Håbo municipality’s increasing usage of chemicals in their water treatment process and to investigate current and future possible technologies for water treatment for Håbo to make their process more sustainable. In this study four scenarios of different cost and change of today’s water treatment plants are presented, while our overall recommendation is to build a new facility. A new plant with new treatment methods such as ultrafiltration is most in line with Håbo municipality’s vision of decreasing chemical usage and sustainability, all while maintaining the water quality. Due to Håbo’s growing population and today’s water plants running close to maximum capacity, a new facility with a larger capacity should be considered. Drinking water treatment Water treatment Drinking water Sustainable drinking water Sustainable water treatment Filtration Water disinfection Chemical reduction Water treatment Ultrafiltration Ozone Active carbon filtration Infiltration UV-radiation Environment affection vattenteknik membran Reningsteknik filtrering vattenrening desinfektion vattenreningsverk dricksvatten ozonering kolfilter Engineering and Technology Teknik och teknologier

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Electromechanical Behavior of Chemically Reduced Graphene Oxide and Multi-walled Carbon Nanotube Hybrid Material

Sustainable water treatment processes : Scenarios for a better environment in Håbo municipality / Hållbar vattenreningsprocess : Scenarion för en bättre omgivning i Håbo kommun