Examensarbeten för masterexamen // Master Theses
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- Post3D Cellulose structures by bottom-up fabrication: A feasibility study evaluating 3D printing of cellulose(2013) Markstedt, Kajsa; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- Post3D Gold Nanoparticle Gradient Structures and Control of Gold Nanorods by Localized Surface Plasmon Resonance(2016) Penders, Jelle; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostA Laboratory Ageing Process of Lignin-Integrated Asphalt(2023) Fornman, Jakob; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering; Westman, Gunnar; Jansson, Lars
- PostAdditives and their effect on the properties of winter diesel fuels(2018) ENGSTRÖM, VIKTOR WALL; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostAlkali and zinc chlorides in waterwall tube corrosion: Effects of pure salts and mixtures(2014) Slomian, Andreas; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostAll-day hair manageability for textured hair types. A revision of the current anti-frizz technologies and suggestions for the future(2016) Bengtsson, Matilde; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostAn investigation of foaming properties of the hemicellulose galactoglucomannan(2018) Fredriksson, Jessica; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostAnalysis of cellulose ether hydrogels for medical device application(2022) Hellström, Sofia; Sjölander, Linnea; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Larsson, Anette; Iselau, Frida; Westling, ÅsaIntermittent catheterisation is done with a single-use catheter, by persons that, for some medical reason, cannot urinate voluntarily. At Wellspect HealthCare intermittent catheters are produced, under the name of LoFric®. Even though the company already has put a lot of effort in reducing its carbon footprint there is a great interest in making the catheters partly or wholly biobased. The catheter is coated with a hydrogel, polyvinylpyrrolidone (PVP), a fossil-based, hydrophilic and slippery coating attached to a fossil-based polyolefin-based elastomer (POBE) catheter tube. There are a lot of biobased material replacement options. Nevertheless, there are specific and high demands on a medical product that must be met. In turn, this puts specific and high demands on a possible biobased replacement. The aim of this study was to investigate biobased polymers as candidates for the hydrogel coating and for the catheter tube, and to evaluate their properties and compare them to the coating properties of PVP and POBE. It was discovered that cellulose ethers could easily form hydrogels with citric acid and successfully coat the POBE catheter. Cellulose ethers crosslinked with citric acid have previously been used as hydrogels for medical applications, but, to the extent of our knowledge, not as coatings for intermittent catheters. Thermoplastic starch (TPS) showed potential as a future POBE replacement, but is in need of further investigation. Neither cellulosebased hydrogels or TPS catheter reached the standard of the LoFric® materials but showed great promise and potential for improvement. These biobased materials, analysed in this study, showed potential to, in future, possibly replace the fossil-based parts of the current LoFric® catheter. This might improve the sustainability of the product further. However, a conversion to a biobased material does not guarantee improvement in sustainability. A life cycle assessment should eventually be carried out.
- PostAntibiotic and Drug Delivery Properties of Nanosized Calcium Phosphate Surfaces(2017) Aonsamang, Panida; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostAntiseptic microspheres embedded in nonwoven fiber materials(2019) Jakobsen, Petrus; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostApplication of amorphous classification system and glass forming ability in pre-formulation design of small organic molecules(2022) Kirithivasan, Mathumitha; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Öhrström, Lars; Putra, Okky; Corner, Phil
- PostAtom probe tomography proteomics(2017) Pihl, Astrid; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostAzetidinium Salts: preparation, reactivity and their adaptation to stereoselective synthesis(2023) Pattabhiraman, Ajay Srinivaasan; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering; Westman, Gunnar; Zacharias, Savannah
- PostBed agglomeration behavior in biomass firing FBC conditions(2020) Tropp, Frida; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Leion, Henrik; Zavenhoven, MariaWhen fossil fuels are phased out and replaced with biomass in energy conversion in fluidized beds, ash-related problems like fouling, sintering, and agglomeration are likely to increase. Agglomeration in a fluidized bed can cause defluidization and result in high operating costs. Biomass with high alkali content like agriculture residue and waste is especially problematic. Since the composition of the fuel is hard to change, a possible solution to the problems could be using alternative bed materials that counteract the agglomeration tendency of the biomass fuel. Therefore, this study focuses on agglomeration phenomena in fluidized beds using alternative bed materials in an attempt to avoid defluidization of the bed. In this study, two byproducts from the steel industry, blast furnace slag, and oxide scales, were tested as bed materials in a laboratory-scale bubbling fluidized bed reactor. Both fuel and salt experiments were performed at 850°C and 900°C. Sunflower seed shell pellets were used as fuel and were fed to the reactor until defluidization occurred or until 700 g had been fed. The salt K2CO3, a synthetic ash component, was added to the reactor in batches of 0.5 g/10 min until defluidization occurred or until a total of 10 g had been fed. The results from the experiments with the two bed materials were also compared to previous studies performed in the same reactor using silica sand as bed material. After each experiment, the bed was examined and analyzed with scanning electron microscope coupled with an energy dispersive X-ray analyzer (SEM-EDX). In the experiments with blast furnace slag, bed agglomerates were found to have been formed around sand particles and potassium silicate glued the particles together. In the oxide scale bed, potassium gathered around the particles, and only very small amounts of potassium silicate could be found after combustion with sunflower seed shell pellets. Both blast furnace slag and oxide scales proved to be able to withstand higher weight percentages of potassium in the bed before defluidization occurred compared to silica sand. This indicates that they could be more suitable bed materials than silica sand for fuels with a high potassium content such as sunflower seed shell pellets.
- PostBioorthogonal design of cancer cell death inducing molecular chimeras(2018) Lindroth, Rickard; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostCarbene catalyzed tribezoin condensation(2020) Barrestål, Simon; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Öhrström, Lars
- PostCarbohydrate Synthesis - Modifications on Cellobiose(2019) Axelsson, Nicolas; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostCatalytic exhaust emission cleaning(2015) Billskog, Fredrik; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostCatalytic reduction of carbon dioxide for production of green fuels(2015) Velin, Peter; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostCharacterisation of Molecular Solar Thermal (MOST) Energy Storage Materials in Miniature Windows(2022) Szolnoky, Clara; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Moth-Poulsen, KasperFinding and developing alternative ways of capturing and storing energy which lead us in the direction of a more sustainable society is one of today’s major challenges. One of these emerging methods is by using molecule solar thermal energy storage (MOST) systems. The principle of the system is a photo-switching process which occurs when the parent molecule is irradiated causing it to form a high energy isomer. As the isomer switches back to the original molecule, energy is released in the form of heat. These molecules can be integrated into different types of matrices such as solutions and films. In this Master’s thesis, the MOST-system are investigated by incorporating the MOST-molecules or photo-switches in thin polystyrene films and monitoring the absorbance of the photochromic materials as a function of film thickness when subjected to irradiation. The project is divided in to two parts; the first consisting of small scale tests of the films in lab. Specifically two molecules are investigated, a norbornadiene and an azobenzene. The photochromic materials are exposed to both LED light using a solar simulator and natural solar radiation for various amounts of time over a number of days and the absorbance is monitored to understand the behaviour of the molecules in films. The second part of the project consists of integrating the materials as windows on a larger scale in a model house and observing the effects of the indoor environment of the house by measuring temperature. The discoveries from the first part of the project show that the absorbance of the films generally decrease over time with increasing film thickness. When exposed to natural solar radiation, the norbornadiene molecule showed a significant level of degradation compared to the azobenzene. The azobenzene was therefore selected for further testing in the windows of the model house. The experiments from the outdoor setup demonstrated that it is highly likely that the windows containing the MOST-molecules have an affect on the heating of the indoor environment during the night. However, the differences were still small and requires further investigation with larger concentrations of the molecule.