| 1. |
- Garskaite, Edita, et al.
(författare)
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Assessing aspects of solution-based chemical synthesis to convert waste Si solar cells into nanostructured aluminosilicate crystals
- 2024
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Ingår i: CrystEngComm. - : Royal Society of Chemistry. - 1466-8033. ; 26:17, s. 2221-2334
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Tidskriftsartikel (refereegranskat)abstract
- The end-of-life recycling of crystalline silicon photovoltaic (PV) modules and the utilisation of waste is of fundamental importance to future circular-economy societies. In the present work, the wet-chemistry synthesis route – a low-temperature dissolution–precipitation process – was explored to produce aluminosilicate minerals from waste c-Si solar cells. Nanostructured crystals were produced in an alkaline medium by increasing the reaction temperature from room temperature to 75 °C. The morphology of the produced crystals varied from nanolayered aggregates to rod-shaped crystals and was found to be dependent on the temperature of the reaction medium. Chemical and phase composition studies revealed that the synthesised compounds consisted of structurally different phases of aluminosilicate minerals. The purity and elemental composition of produced crystals were evaluated by energy dispersive spectroscopy (EDS) and micro X-ray fluorescence (μXRF) analysis, confirming the presence of Al, O, and Si elements. These results give new insights into the processing of aluminosilicate minerals with sustainable attributes and provide a possible route to reducing waste and strengthening the circular economy.
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| 2. |
- Garskaite, Edita, et al.
(författare)
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Flammability and Tribological Properties of Pine Sapwood, Reinforced with Sodium Metasilicate and Non-food Oil
- 2020
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Ingår i: Wood & Fire Safety. - Cham : Springer International Publishing. ; , s. 114-119
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Konferensbidrag (refereegranskat)abstract
- Modification of Scots pine (Pinus sylvestris L.) sapwood using aqueous formulations of Na2SiO3 via vacuum-pressure technique and subsequent treatment with cashew nut-shell liquid (CNSL) is reported. Morphology, elemental distribution within wood matrix, and structural properties of wood-composites were investigated by FE-SEM/EDS, FTIR analysis. Microstructure and density of modified wood blocks were further assessed by X-ray computed tomography. The flammability of Na2SiO3-CNSL-wood composites was evaluated simultaneously performing thermogravimerical (TG) and FTIR gas analysis; the results showed that maximum weight loss for the modified wood was obtained at up to 70 °C lower temperatures compared to the untreated wood, whilst substantially reducing terminal weight losses. The coefficient of friction significantly increased after the CNSL treatment compared to that of untreated wood, but addition of Na2SiO3 to CNSL eliminated most of the friction increase. Enhanced tribological properties along with industrial wood-impregnation method suggest that wood modification using Na2SiO3 in combination with CNSL has a potential for the exploration of a broader range of wood material properties in agreement with sustainable material management.
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| 3. |
- Raudoniene, J., et al.
(författare)
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Textured WO3 and WO3 : Mo films deposited from chemical solution on stainless steel
- 2018
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Ingår i: Thin Solid Films. - : Elsevier. - 0040-6090 .- 1879-2731. ; 653, s. 179-187
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Tidskriftsartikel (refereegranskat)abstract
- Tungsten trioxide (WO3) and molybdenum-doped tungsten trioxide (WO3:Mo) films were deposited on stainless steel surface by a chemical aqueous solution approach using dip-coating technique. The deposited 5, 10 and 15-layer films were homogeneous and continuous. The surface morphology and crystallinity of the produced films were dependent on the metal cation species and concentration of PVA in the solution. FE-SEM analysis revealed the formation of textured WO3 film surfaces having spike-like nanostructures. The values of the static water contact angle measured on the film surface showed that deposited WO3 films can exhibit both hydrophilic and hydrophobic nature, while WO3:Mo films showed hydrophilic behavior. Tribological properties of the deposited films were evaluated in deionized water. All three coatings retained a lubricating layer much better than original steel, demonstrating major reduction in friction and wear. Particularly effective were PVA-free WO3 films, whose friction coefficient stayed under 0.2 for over 2000 cycles. Excellent tribological, hydrophobic and hydrophilic properties along with simple deposition methods suggest very promising potential of WO3 and WO3:Mo coatings in industrial applications.
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