摘要
Many temperature indicators or sensors show color changes for materials used in food and medical fields.However, they are not helpful for a color-blind person or children who lack judgment. In this paper, we introduce simply fabricated and more useful low-temperature indicator(~30 °C) for devices that actuates using paraffin-infiltrated multiwalled carbon nanotube(MWCNT) coiled yarn. The density difference of MWCNT yarn provides large strain(~330 %)when heat causes the melted polymer to move. Furthermore, the MWCNT yarn decreases the melting point of paraffin.These properties allow control of the actuating temperature. In addition, mechanical strength was enhanced by MWCNT than previously reported temperature-responsive actuators based on shape memory polymers. This simply fabricated temperature indicator can be applied in latching devices for medical and biological fields.
Many temperature indicators or sensors show color changes for materials used in food and medical fields.However, they are not helpful for a color-blind person or children who lack judgment. In this paper, we introduce simply fabricated and more useful low-temperature indicator(~30 °C) for devices that actuates using paraffin-infiltrated multiwalled carbon nanotube(MWCNT) coiled yarn. The density difference of MWCNT yarn provides large strain(~330 %)when heat causes the melted polymer to move. Furthermore, the MWCNT yarn decreases the melting point of paraffin.These properties allow control of the actuating temperature. In addition, mechanical strength was enhanced by MWCNT than previously reported temperature-responsive actuators based on shape memory polymers. This simply fabricated temperature indicator can be applied in latching devices for medical and biological fields.
基金
supported by the Creative Research Initiative Center for Self-powered Actuation and the Korea US Air Force Cooperation Program Grant No.2013K1A3A1A32035592 in Korea
Support at the University of Texas at Dallas was provided by Air Force Office of Scientific Research grants FA9550-15-1-0089 and AOARD-FA2386-13-4119
NASA grants NNX14CS09P and NNX15CS05C,
the Robert A.Welch Foundation Grant AT-0029
the Australian Research Council and the Australian National Fabrication Facility
