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- Birdsong, Björn K., et al.
(författare)
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Flexible and fire-retardant silica/cellulose aerogel using bacterial cellulose nanofibrils as template material
- 2024
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Ingår i: Materials Advances. - : Royal Society of Chemistry. - 2633-5409.
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Tidskriftsartikel (refereegranskat)abstract
- This study explores the possibility of using various silsesquioxane precursors such as (3-aminopropyl) triethoxysilane (APTES), methyltrimethoxysilane (MTMS), and tetraethyl orthosilicate (TEOS) to produce silsesquioxane-bacterial cellulose nanofibre (bCNF) aerogels. Each precursor allowed to customize the aerogel properties, leading to unique properties suitable for various applications requiring lightweight insulative materials. When utilizing APTES as the silsesquioxane precursor, an aerogel capable of over 90% recovery after compression was formed, making them suitable for flexible applications. When MTMS was used as the precursor, the aerogel retained some compression recovery (80%) but had the added property of superhydrophobicity with a contact angle over 160° due to the presence of CH3 functional groups, enabling water-repellence. Finally, TEOS allowed for excellent thermal insulative properties with a low Peak Heat Release Rate (PHRR), making it a promising candidate for fire-resistant applications. The customization of these aerogel materials was attributed to a combination of the chemical composition of the silsesquioxane precursors and the morphology of the coated bacterial cellulose nanofibres (bCNF), such as CH3 groups found in MTMS enabled for superhydrophobicity. Differences in morphology, such as uniform and smooth silsesquioxane coatings when using APTES or a “pearl-necklace” morphology using TEOS, enabled either compression recovery and flexibility or low thermal conduction. This investigation of silsesquioxane-bCNF provides a good understanding of the importance of the choice of precursor effect on insulating aerogel properties.
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- Nilsson, Klas, et al.
(författare)
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A novel method of joining thin tubes
- 1991
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Ingår i: EUROJOIN 1. - : Institut de Soudure. ; , s. 253-261
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Konferensbidrag (refereegranskat)abstract
- Radiator tubing formed from brass strip, with wall thicknesses from 0.09-0.120 mm (0.0035-0.0047 in.), has been successfully welded at high welding speed using a CO sub 2 laser. A fully penetrated weld was obtained using welding speeds of > 100 m/min (5.47 ft/s) in production like conditions. The laser used for the welding was a 1700 W, Co sub 2 laser with linear polarisation. A tube with a specially designed "Y" joint was formed in a converted lock seam tube machine. There are several advantages to this new type of "Y" joint, such as higher production rate and the possibility of reducing the thickness of the brass strip by 20-30% when compared to material used in high frequency welding. A large number of parameters were studied including the effects of laser power, welding speed, joint geometry and direction of the laser beam polarisation. Two radiators have been made with solder coated, laser welded tubes. These are currently undergoing mechanical testing. Preliminary results of the testing are favourable.
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- Olsson, Jimmy, et al.
(författare)
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Process study on compression moulding of SMC using factorial design
- 2008
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Ingår i: Proceedings of the 19th International Symposium on Transport Phenomena (ISTP-19). - : University of Iceland, Faculty of Industrial Engineering, Mechanical Engineering and Computer Science.
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Konferensbidrag (refereegranskat)abstract
- During compression moulding of sheet moulding compounds, voids are formed that can deteriorate the properties of the final product. A large number of processing and material parameters can however be tuned in order to reduce the amount of voids. A factorial design is here applied to plan an experimental series where, in particular, vacuum assisted mouldings are carried out in a circular shaped mould. One result is that the electrical insulation can be considerably improved by choosing optimal processing conditions. Another is that the size of weld lines can be reduced in the same fashion.
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- Shanmugam, V., et al.
(författare)
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Potential natural polymer-based nanofibres for the development of facemasks in countering viral outbreaks
- 2021
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Ingår i: Journal of Applied Polymer Science. - : Wiley. - 0021-8995 .- 1097-4628. ; 138:27
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Tidskriftsartikel (refereegranskat)abstract
- The global coronavirus disease 2019 (COVID-19) pandemic has rapidly increased the demand for facemasks as a measure to reduce the rapid spread of the pathogen. Throughout the pandemic, some countries such as Italy had a monthly demand of ca. 90 million facemasks. Domestic mask manufacturers are capable of manufacturing 8 million masks each week, although the demand was 40 million per week during March 2020. This dramatic increase has contributed to a spike in the generation of facemask waste. Facemasks are often manufactured with synthetic materials that are non-biodegradable, and their increased usage and improper disposal are raising environmental concerns. Consequently, there is a strong interest for developing biodegradable facemasks made with for example, renewable nanofibres. A range of natural polymer-based nanofibres has been studied for their potential to be used in air filter applications. This review article examines potential natural polymer-based nanofibres along with their filtration and antimicrobial capabilities for developing biodegradable facemask that will promote a cleaner production.
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