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Professor Qu Lijun of Qingdao University and Professor Zhang Xueji of Shenzhen University collaborated on "ACS NANO": a smart sportswear with self-sensing and coolness based on multi-scale disordered hole fibers
2019-12-27 Source: Polymer Technology

Smart clothing has broad application prospects in wearable fields such as human health monitoring and adaptive. However, current wearable sensors often limit the sensing capability and wearable experience because they are difficult to integrate seamlessly with ordinary clothing.

In order to try to solve this problem and give clothing comfort, the team of Professor Qu Lijun of Qingdao University and the team of Professor Zhang Xueji of Shenzhen University cooperated to prepare an elastic fiber (MPPU) with a multi-scale disordered porous structure through microfluidic spinning technology. The fiber has very good thermal conductivity and can bring people a comfortable feeling of contact and coolness. After being modified by graphene, the research found that the fiber has excellent tensile and temperature sensing properties, and can be used as a sensing unit to seamlessly produce the integration of strain, temperature sensing and coolness through ordinary textile weaving methods. Smart sportswear in one (Figure 1).

Figure 1. Smart sportswear is an elastic fiber made using microfluidic spinning technology and graphene post-treatment. It is constructed by conventional weaving methods and has both self-induction and self-cooling properties. This kind of smart clothing has extensive application potential in human health monitoring and adaptation.

Figure 2. The molding mechanism and self-cooling effect of MPPU fibers. a) Schematic diagram of the radial porous structure formation process. b) Time scale of MPPU fiber formation process and cross-section SEM photos at different time nodes. MPPU 10 纤维纳米和微孔的尺寸分布。 c) Size distribution of nano and micropores of MPPU 10 fibers. d) Comparison of ordinary fabrics and MPPU fabrics. 10面料的红外光线透过率。 e) Infrared light transmittance of cotton, Lycra, MPPU 10 fabric. f) Mechanical properties of MPPU elastic fibers. 10纤维的拉伸行为。 g, h) Tensile behavior of MPPU 10 fiber under 50g load.

Microfluidic spinning technology is a new spinning technology in recent years. Using the laminar flow characteristics and diffusion characteristics of microfluids, the fiber can be adjusted by changing the microchannel design, fluid viscosity, and fluid velocity in the microchannel. The structure and size have unique advantages and broad application prospects in the preparation of controllable structure and designable fiber materials. In this paper, microfluidic spinning technology is used to prepare a polyurethane elastic fiber with a multi-scale disordered porous structure by controlling the concentration of the spinning solution and the flow rate ratio of the microfluid in the chip channel. An exploratory study was performed (Figure 2). Compared with ordinary fabrics, the unique multi-scale disordered porous structure makes MPPU fibers have a higher transmittance to human body's infrared radiation, making the microenvironment temperature between skin and clothing lower by at least 2.5 ° C than cotton fabrics of the same thickness. And the MPPU fiber modified by graphene also has high strain coefficient (GF) and thermal resistance coefficient (TCR), so it has real-time strain and temperature sensing capabilities, which can be used to monitor body temperature, track the state of human movement, and collect heart rate Isometric signals (Figure 3).

Figure 3. Schematic diagram of smart sportswear and its application in human motion and vital signal monitoring. a) The front, back and side views of the smart sportswear are designed with 9 sensing areas. Response curve of G @ MPPU sensing area: b) swallowing, c) talking, d) stretching exercise, e) walking, f) breast expansion, g) breathing, h) lateral twist, i) pulse, j) finger bending. k, l) Schematic and photo of wireless monitoring based on Bluetooth. m) Data of various finger bending movements received through the mobile phone APP.

The above results were recently published in the academic journal ACS NANO (Impact Factor: 13.093). The title of the paper is "Multiscale Disordered Porous Fibers for Self-Sensing and Self-Cooling Integrated Smart Sportswear". The co-first author of the paper is Hu Xilihe , a PhD student at Qingdao University Associate Professor Tian Mingwei , co-corresponding author Professor Qu Lijun of Qingdao University, Professor Zhang Xueji of Shenzhen University , and Professor Xu Tailin of Beijing University of Science and Technology, Qingdao University is the first unit, and Beijing University of Science and Technology, Manchester University and Shenzhen University are cooperative units.

Qingdao University's Intelligent Wearable Technology Research Center was established in June 2018. It integrates electronics, machinery, materials, physics, chemistry, biology, medicine and other multi-disciplines and technologies, combining new material development, new sensing methods and new sensing technologies. Device construction and design. Recently in flexible textile sensors (Nano Lett. 2019, 19, 6592? 6599; Macromol. Mater. Eng., 2019, 1900244; IND. ENG. CHEM. RES., 2019, 58.14, 5737; COMPOS. PART. A-APPL S, 2019, 117, 202), smart fibers (Carbon, 2019, 152, 106; J. ALLOY. COMPD., 2019, 782, 986; CARBOHYD. POLYM., 2014, 111, 456;), functional textiles (ACS APPL MATER INTER, 2019, 11 , 46278; IND. ENG. CHEM. RES., 2018, 57.40, 13437; APPL. SURF. SCI., 2016, 377, 141; Carbon, 2016, 96, 1166; Carbon, 2015, 95, 625; APPL. SURF. SCI., 2014,317,505; Carbon, 2014, 80,565) and other research directions have made a series of research results.

Paper link: http://doi.org/10.1021/acsnano.9b06899

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