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KR-102960867-B1 - MULTIMODAL WEARABLE SENSOR AND METHOD FOR SIMULTANEOUS MEASURING OF MECHANICAL CHANGE AND TEMPERATURE CHANGE USING THEREOF

KR102960867B1KR 102960867 B1KR102960867 B1KR 102960867B1KR-102960867-B1

Abstract

The present specification relates to a wearable sensor and a method for simultaneously measuring mechanical changes and temperature changes using the same. A multi-mode wearable sensor according to one embodiment of the present invention can individually distinguish each stimulus applied simultaneously and exhibits excellent mechanical strength.

Inventors

  • 문홍철
  • 최원영

Assignees

  • 서울시립대학교 산학협력단

Dates

Publication Date
20260507
Application Date
20230202

Claims (10)

  1. It includes an ion gel comprising a gelator and an ionic liquid, and The above gelator is a random copolymer comprising a domain containing a repeating unit represented by the following chemical formula 1, and a domain containing a repeating unit represented by the following chemical formula 2, and Multimode wearable sensor capable of simultaneously measuring mechanical and temperature changes: [Chemical Formula 1] [Chemical Formula 2] (wherein R 11 is each independently selected from the group consisting of a halogen group, a nitrile group, a nitro group, an amine group, a substituted or unsubstituted C 1 -C 10 alkyl group, a substituted or unsubstituted C 1 -C 10 alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted C 5 -C 14 heteroaryl group, and combinations thereof, and n 11 is 0 to 5, and R 12 is selected from the group consisting of hydrogen, halogen group, nitrile group, nitro group, amine group, substituted or unsubstituted C 1 -C 10 alkyl group, substituted or unsubstituted C 1 -C 10 alkoxy group, substituted or unsubstituted C 5 -C 14 aryl group, substituted or unsubstituted heteroaryl group, and combinations thereof, and R 21 is selected from the group consisting of hydrogen, halogen group, nitrile group, nitro group, amine group, substituted or unsubstituted C 1 -C 10 alkyl group, substituted or unsubstituted C 1 -C 10 alkoxy group, substituted or unsubstituted aryl group, substituted or unsubstituted heteroaryl group, and combinations thereof, and R 22 is selected from the group consisting of substituted or unsubstituted C 1 -C 12 alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heteroaryl groups, and combinations thereof, and n1 and n2 are each independently molar ratios of the repeating unit, where n1 + n2 = 1, n1 is a real number from 0.05 to 0.5, and n2 is a real number from 0.5 to 0.95), Here, the mechanical change and temperature change mentioned above can be measured simultaneously by measuring the resistance and transmittance of the ion gel, respectively.
  2. delete
  3. In paragraph 1, A multimode wearable sensor in which the transmittance of the ion gel changes with the transition of the lower critical solution temperature (LCST) of the ion gel.
  4. In paragraph 1, A multimode wearable sensor in which the above temperature change is measured from the temperature coefficient of transmittance (TCT) derived from the following mathematical formula 1: [Mathematical Formula 1] (Here, t T is the instantaneous transmittance of the ion gel at the measurement temperature, t 0 is the transmittance of the ion gel at the initial temperature, and ΔT is the temperature change).
  5. In paragraph 1, A multi-mode wearable sensor comprising the above gelator in an amount of 30% to 80% by weight relative to the total weight of the ion gel.
  6. In paragraph 1, A multimode wearable sensor in which the number average molecular weight (Mn) of the above gelator is 90 kg/mol to 400 kg/mol.
  7. In paragraph 1, The above gelator is poly(styrene-ran-n-butyl methacrylate) , which is a random copolymer of styrene and n-butyl methacrylate (nBMA), and The above ionic liquid is 1-butyl-3-methyl imidazolium bis(trifluoromethylsulfonyl)imide (1-butyl-3-methyl imidazolium bis(trifluoromethylsulfonyl)imide, [BMI][TFSI], a multimode wearable sensor.
  8. A method for simultaneously measuring mechanical changes and temperature changes applied to a wearable sensor by measuring the resistance and transmittance of an ion gel included in a multi-mode wearable sensor according to one of claims 1 and 3 to 7.
  9. In paragraph 8, A measurement method in which the transmittance of the above ion gel changes due to the transition of the lower critical solution temperature (LCST) of the above ion gel.
  10. In paragraph 8, A measurement method in which the above temperature change is measured from the temperature coefficient of transmittance (TCT) derived from the following mathematical formula 1: [Mathematical Formula 1] (Here, t T is the instantaneous transmittance of the ion gel at the measurement temperature, t 0 is the transmittance of the ion gel at the initial temperature, and ΔT is the temperature change).

Description

Multimode Wearable Sensor and Method for Simultaneous Measurement of Mechanical Change and Temperature Change Using the Same The present specification discloses a wearable sensor and a method for simultaneously measuring mechanical change and temperature change using the same. [Explanation of Government-Supported R&D] This application was made based on the following research conducted with funding from the Ministry of Science and ICT and support from the National Research Foundation of Korea. <Jasa 1> [Unique Project Number] 1711153985 [Sub-project No.] NRF-2020M3D1A2102869 [Ministry Name] Ministry of Science and ICT [Specialized Research Management Agency] National Research Foundation of Korea [Research Project Name] Nanomaterial Technology Development [Research Project Title] Development of Novel High-Performance Materials and Devices for Automotive Electrochromic Transparent Displays [Organizing Institution] Seoul National University Industry-Academic Cooperation Foundation [Research Period] 2022.01.01~2022.12.31 Sasa 2 [Unique Project Number] 1711156397 [Sub-project No.] NRF-2022R1A2C4001425 [Ministry Name] Ministry of Science and ICT [Specialized Research Management Agency] National Research Foundation of Korea [Research Project Name] Individual Basic Research [Project Title] Development of a Multimodal Stimulation-Responsive Ion Gel-Based Wearable Ionic System [Organizing Institution] Seoul National University Industry-Academic Cooperation Foundation [Research Period] 2022.03.01~2023.02.28 Sensors capable of detecting changes in the external environment and converting them into analyzable digital output signals are core components of wearable electronic devices. In particular, these sensors are receiving significant attention as human-machine interfaces for realizing the Internet of Things (IoT) combined with augmented reality (AR) and virtual reality (VR) technologies, as well as ion-electronic skins for monitoring human movement and medical conditions. To expand the scope and diversity of applications, sensors capable of responding to various stimuli have been developed. For example, Korean Patent Publication No. 10-2022-0038007 proposes a tactile sensor in which capacitance changes in response to one or more external stimuli selected from temperature and pressure. However, conventional sensors rely solely on the electrical properties of conductive materials to generate analyzable digital output signals regardless of the type of external stimulus, measuring both temperature and strain, for instance, through changes in the resistance of a conductor. As such, methods analyzing a single electrical parameter are being used to detect multiple independent environmental changes. According to such conventional sensors, while individual recognition of each stimulus is possible, output signals may overlap when simultaneously exposed to mechanical and temperature changes. In other words, the contribution of each stimulus to the total output signal cannot be separated. To address these issues, a multimode sensor capable of detecting various stimuli using different electrical parameters for each stimulus—for example, measuring resistance for humidity and current for pressure—can be considered. However, this approach is not free from the problem of signal crosstalk because the parameters used are still correlated. Another strategy to separate electrical signals caused by different stimuli is to physically combine two separate sensing units; however, this system is not an integrated platform, and the manufacturing process is relatively complex. Therefore, there is a need to develop a sensor capable of individually distinguishing each simultaneously applied stimulus through changes in two different physical characteristics. FIG. 1 is an image showing the concept of a multi-mode wearable sensor according to one embodiment of the present invention. FIG. 2 is a graph showing the SEC trace of a gelator according to one embodiment of the present invention. FIGS. 3a to 3e are graphs showing the 1H NMR spectra of a gelator according to one embodiment of the present invention. FIGS. 4a to 4c are graphs showing the measurement results of the storage modulus and loss modulus of an ion gel according to one embodiment of the present invention. Figure 5 is a graph showing the low critical solution temperature (LCST) of an ion gel according to one embodiment of the present invention. Figure 6 is an optical microscope image showing the characteristics of an ion gel according to one embodiment of the present invention. Figure 7 is a photographic image showing the transparency of an ion gel according to one embodiment of the present invention. Figure 8 is a graph showing the results of measuring the transmittance of an ion gel according to one embodiment of the present invention. FIG. 9 is a photographic image showing the transparency of an ion gel according to one embodiment of the present invention and a graph showing the transmi