Lim Taekyung, Jeong Sang-Mi, Kim Gun Hee, Seo Keumyoung, Seo Hee Sung, Yang Jonguk, Ju Sanghyun
Major in Nano·Semiconductor, School of Electronic Engineering, Kyonggi University Suwon Gyeonggi-do 16227 Republic of Korea
RSC Adv. 2024 Feb 26;14(10):6856-6864. doi: 10.1039/d3ra08377b. eCollection 2024 Feb 21.
Among different heat-responsive polymers, hydroxypropyl cellulose (HPC) is biodegradable and is widely used in products that are harmless to the human body, such as food and pharmaceuticals. When the temperature of the hydrogel-type HPC increases, the hydrophilic bonds between the HPC molecules break, and the HPC molecules aggregate owing to the hydrophobic bonds. Therefore, light transmittance may vary because the aggregated HPC molecules scatter light. This study investigated the implementation of a display using the thermoreversible phase transition of HPC. Herein, a near-infrared (NIR) laser was irradiated only to a local area to control the surface temperature and enable the effective operation of the thermoreversible phase transition of HPC. For this, cesium tungsten oxide (CTO), which absorbs NIR light and generates heat, was mixed with the HPC hydrogel to improve the photothermal effect. Moreover, by additionally mixing carbon nanotubes (CNTs) with high thermal conductivity, the heat generated from the CTO is quickly transferred to the HPC hydrogel, and the heat of the HPC hydrogel is quickly cooled through the CNTs after stopping the NIR laser irradiation. The produced NIR-writing CTO-CNT-HPC (CCH) thermoresponsive display exhibited a fast thermoresponsive time. The CCH thermoresponsive display developed in this study can be applied in situations that require fast display response times, such as interactive advertising, property exhibitions, navigation systems for car, schedule information, event information, and public announcements.
在不同的热响应聚合物中，羟丙基纤维素（HPC）是可生物降解的，并且广泛应用于对人体无害的产品中，如食品和药品。当水凝胶型HPC的温度升高时，HPC分子之间的亲水键断裂，HPC分子由于疏水键而聚集。因此，由于聚集的HPC分子散射光，透光率可能会发生变化。本研究调查了利用HPC的热可逆相变实现显示器的情况。在此，仅对局部区域照射近红外（NIR）激光以控制表面温度，并使HPC的热可逆相变有效运行。为此，将吸收NIR光并产生热量的氧化铯钨（CTO）与HPC水凝胶混合以提高光热效应。此外，通过额外混合具有高导热性的碳纳米管（CNT），CTO产生的热量迅速传递到HPC水凝胶，并且在停止NIR激光照射后，HPC水凝胶的热量通过CNT迅速冷却。所制备的近红外写入CTO-CNT-HPC（CCH）热响应显示器表现出快速的热响应时间。本研究中开发的CCH热响应显示器可应用于需要快速显示响应时间的情况，如交互式广告、房产展览、汽车导航系统、日程信息、活动信息和公共公告。
