Anti-icing solutions combining printed electronics and nanotexturing of Al alloys

Aluminum superhydrophobic (SHP) surfaces have been prepared by the combination of chemical microtexturing and surface functionalization with long-chained polyfluoroalkyl moieties. On the opposite side to the modified surface self-limiting heating element has been printed using carbon based possitive temperature coefficient (PTC) inks. Different heater configurations were tested to optimize heater design. Results showed that the combination of both strategies was able to maintain the aluminum surface ice free under tested conditions. The developed hybrid system showed good performance under anti-icing conditions with potential to be applied in aircraft systems

Direct Acrylation of Soybean Oil and the Influence of the Acrylation Degree on Waterborne Acrylic Systems

Publisher Copyright: © 2024 by the authors.The direct acrylation of soybean oil was investigated by the activation of soybean oil’s (SO’s) internal fatty unsaturation with acidic catalysts. The effect of the catalyst and the reactant ratio with respect to the unsaturation and reaction time on the direct acrylation process were explored. ASO (acrylated soybean oil) with acrylation degrees (the number of acrylate molecules introduced in a triglyceride molecule) between 1.6 and 2.55 were obtained. The effect of the ASO acrylation degree on copolymerization processes was investigated. The resulting monomers were successfully copolymerized with meth(acrylate) monomers by the miniemulsion polymerization process, favoring the droplet nucleation mechanism and showing conversions higher than 97%. The acrylic–ASO copolymers presented lower Tg and higher hydrophobicity and oleophobicity than the acrylic copolymer.Peer reviewe

Silver and copper screen-printed temperature sensors on flexible substrates: The impact of ink sintering conditions and composition

Publisher Copyright: © 2024 Wiley-VCH GmbH.Fully screen-printed silver and copper temperature sensors were studied up to 100°C. The influence of the processing conditions and the composition of three silver and one copper commercial inks is analyzed in this study. The curing temperature is extremely relevant to stabilize the initial resistance of silver sensors, especially for those printed with the lowest solid content ink. All printed sensors showed good linear behavior in the range of 25–100°C (R2 > 0.999) except for those fabricated with the lowest solid content silver ink, which also displayed the highest hysteresis and drift. The temperature coefficient of resistance (TCR) obtained for the copper sensors was 3.367 × 10−3 K−1 and for the three silver sensors, it ranged between 2.723 × 10−3 to 2.963 × 10−3 K−1. This TCR is higher than values reported for inkjet-printed resistive temperature detectors. Overall, this work demonstrates that low-cost, linear, screen-printed temperature sensors can be successfully fabricated on flexible substrates.Peer reviewe