JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 48
·51367
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IF 3.125
Yujiao Gao,Dongning Liu,Yuanyuan Xie,Yiheng Song,Enwen Zhu,Zhuqun Shi,Quanling Yang,Chuanxi Xiong
In recent years, the wearable electronic skin (E-skin) has attracted more and more attention due to high sensitivity, good portability and flexibility. In this work, we used the 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-oxidized cellulose nanofibril (TOCN) as the substrate, and used the in-situ polymerization method to introduce polypyrrole (PPy) into the TOCN substrate. Then, the nylon gauze was used as microstructure template to prepare a TOCN/PPy E-skin with a surface microstructure. This E-skin possessed excellent sensing and mechanical properties. In the pressure range of 0–600 Pa, the sensitivity of E-skin was 3.13 kPa −1 . In addition, the E-skin exhibited ultrafast response/recovery time (≤10 ms), ultralow detection limit of 0.3 Pa, good stability (>9000 cycles) and mechanical strength of up to 117 MPa. Therefore, the TOCN/PPy E-skin has broad development prospects in the fields of artificial intelligence and health monitoring.
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
DOI
高影响因子
Energies
·
2023
·Vol. 16
·期 13
·5112
·
IF 3.2
Jinlin Liu,Yu Wang,Zilong Zhong,Zhou Zhou,Dongliang Chen,Weijie Wang,Shuaixing Mai
Air-conditioning systems account for 40–60% of the energy consumption of buildings, and most of this figure corresponds to the cooling and dehumidification process of air-conditioning units. Compared with traditional compressed air-conditioning systems, solid adsorption dehumidification systems possess good potential to improve indoor air quality and reduce buildings’ energy consumption. However, there are still some problems that prevent the use of solid adsorption dehumidification systems, such as their complexity and high regeneration temperatures. The key to solving the above problem is the discovery of more suitable adsorbents. In this paper, poly N-isopropylacrylamide/polypyrrole (PNIPAm/PPy) hydrogel was selected as the research object, and the performance of the dehumidification material and its potential for application in solid dehumidification systems were studied. It was found that the pore structure of PNIPAm/PPy was relatively complex and that there were abundant pores with uneven pore sizes. The minimum pore size was about 4 μm, while the maximum pore size was about 25 μm, and the pore sizes were mostly distributed between 8 and 20 μm. Abundant and dense pores ensure good hygroscopic and water-releasing properties of the resulting hydrogel. The PPy inside the hydrogel acts as both a hygroscopic and photothermal agent. In an environment with a relative humidity of 90%, 60%, and 50%, the hygroscopic efficiency of PNIPAm/PPy reached 80% in about 75, 100, and 120 min, and the corresponding unit equilibrium hygroscopic capacity values were 3.85 g/g, 3.72 g/g, and 3.71 g/g, respectively. In the initial stage, the moisture absorption increased with the increase in time; then, the increase in moisture absorption decreased. When the temperature was below 40 °C, the hygroscopic performance of PNIPAm/PPy was almost temperature-independent. The PNIPAm/PPy with different thicknesses showed similar moisture absorption efficiency. The lowest desorption temperature of PNIPAm/PPy was 40 °C, which indicates that low-grade energy can be used for material desorption. And the higher the temperature, the faster the desorption rate of PNIPAm/PPy and the higher the desorption amount. It can be seen that the PNIPAm/PPy hydrogel presents good desorption performance and can be used repeatedly.Keywords:heat and mass transfer in porous media;dehumidification material;hydrogel;solid dehumidification system;hygroscopic efficiency;desorption performance
研究领域:
材料科学
·
环境工程
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
BIOMATERIALS
·
2024
·
IF 12.8
Zhuangzhuang Chu,Xingdan Liu,Tong Zhao,Dongya Jiang,Jing Zhao,Xiaohua Dong,Kelvin W.K. Yeung,Xuanyong Liu,Yun Liao,Liping Ouyang
Non-healing diabetic foot ulcers are the knotty public health issue due to the uncontrolled bacterial infection, prolonged inflammation, and inferior vessel remodeling. In this work, polypyrrole (Ppy) was added into the hybrid hydrogel containing polyvinyl alcohol (PVA), polyethylene glycol (PEG), and hyaluronan (HA) to acquire superior mechanism and photothermal ability. The Ppy composited hybrid hydrogel could effectively kill bacteria through accumulating heat on the hydrogel surface. RNA-Seq analysis shows that the heat accumulation could enhance phagosome of macrophage and M1 activation, which further accelerate bacteria clearance. Benefitting from the bacteria clearance, macrophage could transform its phenotype to M2 in Ppy composited hybrid hydrogel group with near infrared light (NIR) stimulation. The related genes expression in keratinization, keratinocyte differentiation, and establishment of the skin barrier in the skin were up-regulated and collagen and vascular endothelial growth factor (VEGF) expression level are also enhanced. In summary, Ppy composited hybrid hydrogel could effectively solve the issues of infection and poor wound healing in diabetic foot ulcers, making it an ideal candidate dressing for the treatment of chronic wounds.
研究领域:
生物医学工程
·
伤口愈合
·
组织工程
·
材料科学
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光热治疗
·
感染控制
·
免疫学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）