Examinando por Autor "Collado, Ignacio"

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Energy from Waste: Triboelectric Nanogenerators from Fully Fabric Materials for Smart Textiles. An Introductory Activity for Fine Arts and Design Students
(ACS, 2024-11-15) Collado, Ignacio; Sánchez del Río Saez, José; de la Vega, Jimena; Vázquez-López, Antonio
Smart textile fabrics have arisen as an emerging technology, aiming to integrate advanced functionalities into conventional fabrics. While they are highly valuable in fashion and design, a significant knowledge gap exists between the underlying physical and chemical principles of smart textiles and fashion designers, which might be unfamiliar with those concepts closely related to electronics, physics, engineering, chemistry, or material science. In this article, we present a simple pedagogical experiment as an introduction to smart textiles, focusing on triboelectrification. Triboelectric nanogenerators (TENGs) can transform mechanical energy into electricity via friction or contact between two different layers such as two different fabrics. The activity described here involves assembling TENGs using various textile fabrics, from common fabrics, such as cotton, to recycled fabrics, such as polypropylene from face masks. By carefully selecting textile pairs according to the triboelectric series (a semiempirical approach), the output voltage can be maximized, which is sufficient to power a series of LED lights or even charge a small load, such as a capacitor. This straightforward experiment helps introduce students and researchers from various disciplines to the basic concepts and terminology of TENGs, enabling them to create a micro power generator using commonly available fabrics.
Graphene Oxide/Polylactic Acid-Based Face Mask to Combat H3N2: A Strategy against Influenza
(ACS, 2024-03-14) Vázquez-López, Antonio; de la Vega, Jimena; Collado, Ignacio; Carmona, Franciso Javier; Prádanos, Pedro; Prolongo, Silvia G.; Wang, De-Yi
Personal protective equipment such as face masks has become a fundamental tool to fight against virus-filled airborne droplets, preventing their widespread and the emergence of pandemics. While most face masks avoid the passing of airborne particles via a filtration effect, their protection effectiveness can be further increased by developing techniques based on antiviral coatings, which can inhibit virus replication. Among different coatings, carbon-based coatings are considered very appealing due to their low price and high antiviral properties. Most importantly, proper material selection during mask manufacturing is becoming more crucial as the high demand and consumption of common polypropylene face masks have grown into a huge environmental hazard. Herein, we present a potential face mask system based on nanoplatelets of graphene oxide (GO) spray coated via a simple one-step procedure over a poly(lactic acid) textile fabric, allowing a homogeneous coating. The incorporation of GO does not affect the textile structure nor affect its air permeability, while it increases its water contact angle, potentially preventing droplet trespassing. The antiviral efficiency was tested against Influenza A virus (H3N2) (strain A/Hong Kong/8/68), reaching a high reduction with no cytotoxic effect observed.
MXene multi-functionalization of polyrotaxane based PCMs and the applications in electronic devices thermal management
(Elsevier, 2024-10-01) Yin, Guangzhong; López, Alba Marta; Collado, Ignacio; Vázquez-López, Antonio; Ao, Xiang; Hobson, Jose; Prolongo, Silvia G.; Wang, De-Yi
The aim of this work was to improve the thermal conductivity and electromagnetic shielding of the leakage proof phase change materials (PCMs), in which a polyrotaxane (PLR) was used as a support material to encapsulate PEG 1k or PEG 6k and MXene as multi-functional filler. The PCMs can be processed conveniently by a hot press and the PEG 1k containing samples showed excellent flexibility. We conducted a systematic evaluation of the phase transition behavior of the material, thermal conductivity and electromagnetic shielding performance tests. Notably, the PCMs achieved a high enthalpy values (123.9–159.6 J/g). The PCMs exhibited an increase of 44.3 %, and 137.5 % in thermal conductivity values with higher MXene content (5 wt%) for PLR-PEG6k and PLR-PEG1k, respectively, and show high shape stability and no leakage during and after phase transition. The introduction of MXene can significantly improve the electromagnetic shielding performance of PCM composites. Typically, higher conductive samples (samples which contain high MXene contents) offer a higher EMI SE shielding, reaching a maximum of 4.67 dB at 5.6 GHz for PLR-1K-MX5. These improvements solve the main problems of organic PEG based PCMs, thus making PLR-PEG-MXene based PCMs good candidates for thermoregulators of both solid-state disks and smart phone. It is worth pointing out that the sample PLR-1k-MX5 can decrease 4.3 °C of the reference temperature during cellphone running. Moreover, the temperature of the protecting sheet in the simulated solid state disk with PCM was significantly lower (showing a decreasing of 7.9 °C) compared with the blank sample.