Science China-Technological Sciences
·
2024
·Vol. 67
·期 7
·2125-2132
·
IF 4.4
Zhu JingYu,Liu YaDong,Xie RuiJie,Zhao YuHan,Wang Feng,Liu YunQing,Zha BaoLi,Wu JianSheng,Huo FengWei
Flexible heaters with personal thermal management capabilities have great potential in thermal therapy applications due to their excellent flexibility, low power consumption, and portability. However, manufacturing wearable heating devices that are breathable, wear resistant and conformal for long-term use is still challenging. To address these issues, we designed a leather heater using breathable, biocompatible, and tailorable leather as the substrate through a simple in-situ polymerization polypyrrole strategy. This heater exhibits excellent heating and mechanical properties (reaching 64°C at a voltage of 5 V with efficient Joule heat generation of 2286 W/m 2 and uniform temperature distribution, and functioning properly after 1000 cycles of bendability tests). In addition, this heater displays better wear resistance and water vapor permeability rate (38.04 g/(m 2 h)). The cuttable and sewable of leather gives the strategy ability to be flexibly designed to mold the heater to the specific requirements of different body parts, providing a new approach to wearable thermal therapy.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Progress in Natural Science-Materials International
·
2024
·
IF 4.8
Qinli Ye,Jinhui Lin,Guoxiang Wang,Shuwen Zeng,Tao Jiang,Xiang Gao,Muhammad Danang Birowosuto,Wei Xiong,Chenjie Gu
Infrared thermography technology is a noninvasiveness and real-time imaging method, it has attracted enormous attentions for blood flow imaging. However, the implementation of infrared thermography technology is still limited by the poor imaging quality caused by the low temperature discrimination between the target blood vessel and background. Herein, we reported a flexible and low-cost MXene based photothermal microheater for enhancing the infrared imaging of blood flow. In the experiment, MXene films with specific thickness was prepared by vacuum filtering different concentrations of MXene colloidal solutions. Thereafter, the microheaters were fabricated by assembling the MXene films on the PU tape/PDMS substrate, and then sealed with another layer of pure PDMS film on the top of MXene film. The photothermal performance of the microheaters were evaluated by using an 808-nm laser as the exciting source. Experimental results show that the optimal microheater (MXene content: 17.5 mg) can reach a safe temperature of 41.5 °C with 43.9 s under the light irradiation of 100 mW·cm −2 . Moreover, it can be stabilized at the equilibrium temperate for over 25 min. Finally, the above optimal microheater was used to accurately heat the simulated blood vessel. It shows that temperature difference of 3.3 °C can be induced between the heated blood vessel and environment. As a result, it significantly enhances the quality of the infrared imaging of the blood flow in the simulated vascular network.
研究领域:
生物医学工程
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材料科学
·
医学影像学
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2020
·
IF 2.762
Yuxin Zheng,Chen Zhang,Haihua Liu
A new flow calorimeter is developed to analyze the isobaric heat capacity of liquid. The characteristics of calorimeter have been studied at temperatures from 293 K to 353 K and pressures from 0.1 MPa to 15 MPa. The design of the calorimeter includes the innermost part of the calorimeter with two thick-walls, aluminum shields and microheater. The function of thick-walls with aluminum shields is to replace the conventional constant temperature bath for minimizing heat loss and precisely controlling the temperature of calorimeter. In order to verify the feasibility and reliability of the apparatus, the heat loss is checked by pure water under given pressure and various temperatures. The heat capacity of toluene, heptane and cyclohexane are measured at various temperatures and pressures. The experimentally measured data as a whole is in good agreement with the literature values available. Compared with the literature data, the experimental results by using the new calorimeter show that the deviations are less than 2%.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Yongqing Zhang,Jiahang Zhou,Lingui Hu,Yunbo Li
Silver nanowires (AgNWs) films are a promising alternative to indium tin oxide (ITO) as transparent conductors, but their adhesion and thermal stability are limited. We prepared a transparent conductive film by bonding PEDOT:PSS with graphene and AgNWs on a hydrophilically treated polyethylene terephthalate (PET) substrate. This improved the film’s thermal stability and reduced resistivity due to enhanced adhesion. The sheet resistance of the flexible AgNWs/GR/PEDOT:PSS composite film decreased to about 20 Ω/sq at approximately 80 % transmittance, with minimal changes after bending tests, indicating good adhesion to PET. The composite film also demonstrated excellent stability under long-term storage and high temperatures (up to 106 °C). Joule heating evaluations revealed an average heating rate of 7.19 °C/s at low bias voltages (6.0–12.0 V), highlighting its potential for flexible transparent heaters in future electric heating devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Tong Wu,Song Ren,Wasim Akram,Tingshan Li,Xiangyu Zhu,Xinran Li,Li Niu,Haojun Fan,Zhe Sun,Jian Fang
A three-dimensional (3D) hierarchical microfiber bundle-based scaffold integrated with silver nanowires (AgNWs) and porous polyurethane (PU) was designed for the Joule heater via a facile dip-coating method. The interconnected micrometer-sized voids and unique hierarchical structure benefit uniform AgNWs anchored and the formation of a high-efficiency 3D conductive network. As expected, this composite exhibits a superior electrical conductivity of 1586.4 S/m and the best electrothermal conversion performance of 118.6 °C at 2.0 V compared to reported wearable Joule heaters to date. Moreover, the durable microfiber bundle–PU network provides strong mechanical properties, allowing for the stable and durable electrothermal performance of such a composite to resist twisting, bending, abrasion, and washing. Application studies show that this kind of Joule heater is suitable for a wide range of applications, such as seat heating, a heating jacket, personal thermal management, etc.
研究领域:
材料科学
·
能源技术
·
纺织工程
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2019
·
IF 0
Nan Zhang,Chun Huang,Shangshang Wan,Ling Kang,Menghan Hu,Yonghua Zhang,Xing Wu,Jian Zhang
An easy-to-fabricate, high-performance, and ultrabendable heater is always essential for the development of flexible devices such as gas sensors. Currently, most of the flexible heaters involve vacuum facilities or special inkjet printers/inks, which leads to complex processes and high fabrication cost. In this work, an innovative polymeric metalization technique was developed on polyimide substrate: in addition to the tunable electrical properties, Ag thin films obtained through the low-temperature solution-based process, the so-called surface modification and ion exchange (SMIE) process, could provide enhanced interfacial adhesion and mechanical stability. With a carbon ink as a masking layer, generated by a common home-/office-use inkjet printer, more than 400 patterned flexible heaters can be batch-fabricated on an A4 size polyimide conveniently. The results indicate that the heaters exhibit good electrical properties as well as superior bending stabilities. For the heaters with dimension of 1 cm × 1 cm, under an applied voltage of 20 Vdc, the maximum temperature achieved is 300 °C. Both the response time and recovery time are less than 15 s. The heaters can bear more than 1200 times bending cycling with a relative resistance change ratio of 0.11%. The developed technology is compatible with current batch fabrication processes such as roll-to-roll and can be employed to develop flexible heaters with high mechanical stability in the future.
研究领域:
材料科学
·
柔性电子
✓ 已验证
产品关联
DOI
Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 4
·1895-1905
·
IF 6.788
Lingyun Xu,Haopeng Wang,Yadong Wu,Zian Wang,Lixin Wu,Longhui Zheng
In recent years, the fabrication of printable graphene inks has attracted considerable attention. However, obtaining green and scalable production of these types of inks with high electrical conductivity using simple methods has always been challenging. Herein, a novel one-step method for preparing graphene inks by microfluidization was developed. Moreover, the resistances of graphene film heaters based on the condensed graphene inks using the screen printing method were adjustable. The results show that the obtained inks contained 1 to 5 layers of graphene with high quality. The prepared graphene films exhibit high electrical conductivity (9.7 × 104 S m−1) and their heaters have fast heat-generating performance; typically, after 5 printing passes, the heater reaches a high temperature of 111 °C within 100 s under 3.0 V, and further rising to a higher temperature of 193.4 °C under 5.0 V. Favorable flexibility and durability are also maintained; specifically, no apparent change of resistance of the graphene film heater can be detected after 5000 times of bending and flexing. The prepared flexible graphene film can be used for heating elements and wearable devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Daozheng Yang,Bing Zhou,Gaojie Han,Yuezhan Feng,Jianmin Ma,Jian Han,Chuntai Liu,Changyu Shen
Flexible transparent heaters based on photothermal energy conversion are highly desired for next-generation electronic devices. However, how to balance the photothermal conversion efficiency and transparency is still a huge challenge. In this work, we demonstrate a flexible polycarbonate (PC) film with balanced photothermal energy conversion performance and transparency obtained from the spraying polypyrrole (PPy)-modified Ti3C2Tx MXene (MXene@PPy) layer. Due to the synergistic light-to-heat effects of MXene and the attached PPy nanoparticles, the resulted transparent film heater (MP-PC) can obtain a satisfying photothermal conversion performance (47.5 °C at 100 mW/cm2) at a low spraying density of MXene and thus show an effective transmittance of 51.61%, simultaneously. Moreover, the photothermal conversion performance reveals an outstanding stability without significant deterioration after exposing to an outdoor environment for seven months. Besides, arising from the excellent surface electrical resistance (413 Ω/sq), the MP-PC film also exhibits an effective Joule heating capacity with a high heating temperature of 108 °C at 24 V input voltage. As one of the promising applications, the MP-PC film exhibits the effectiveness and feasibility as a light-triggered thermal therapy film for human skin in cold environments.
研究领域:
材料科学
·
能源技术
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2022
·Vol. 9
·期 7
·1911-1920
·
IF 15.717
Limei Zhang,Kun Jia,Jiao Wang,Jiayou Zhao,Jingda Tang,Jian Hu
Transparent heaters (THs) are widely used for various applications, such as in smart windows, deicers, defoggers, displays, and thermotherapy pads. The rapid development of flexible electronics has led to a demand for flexible and even stretchable THs. At present, most stretchable THs are designed using a combination of electronically conductive networks and flexible polymer materials. Electronic THs still face common challenges, such as a transparency-conductance trade-off, non-uniform heating, and poor interfacial adhesion. In this work, an ionic TH is reported based on a stretchable and transparent ionogel. Joule heating from an ionic current induced by alternating voltage functions as the heating source. This ionogel-based TH exhibits excellent and steady mechanical, optical, electrical, and thermal properties, simultaneously solving the abovementioned three problems relating to electronic THs. Two simple applications of this ionogel-based TH are demonstrated: deicing and boiling water. This reported ionogel-based TH provides a new material choice and heating principle to compete with conventional electronic TH technology.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2023
·
IF 10.9
Min Li,Tao Wang,Xiang-Le Liu,Ze-Long Bao,Peng-Fei Qian,Kun Liu,Yaling Shi,Xianbing Ming,Hong-Zhang Geng
Phosphotungstic acid (PTA) is a highly stable dopant . In this research, transparent conductive films (TCFs) with polyethylene terephthalate as a substrate and PTA/Au secondary p -type doped single-walled carbon nanotubes (SWCNTs) as a conductive layer were prepared by spraying and employed as heating devices. The films had excellent optoelectronic properties (sheet resistance of 46.7 Ω/sq with 87.1% transmittance), mechanical properties (only 0.03 change in sheet resistance after 5000 bending cycles), stability (29.4% change in sheet resistance after one week of exposure to 95% humidity) and electrical heating properties. Transparent flexible heaters (TFHs) made of PTA/Au dual p -type doped SWCNT TCFs have a quick response to temperature changes and outstanding cycling stability. At an operating voltage of 20 V, the temperature of the TFH rapidly reached its maximum steady-state temperature ( T max ) of ∼120 °C within less than 90 s. After 50 cycles at 15 V in the voltage-on-off cycle test, the T max achieved by the TFH did not change appreciably. The results of the performance evaluation indicate that the film has a bright future in flexible wearable devices for warmth, physiotherapy, or deicing/defrosting applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 17
·1-10
·
IF 2.8
Jiang Yizhou,Zhang Yongqing,Zhou Jiahang,Li Yunbo
A high-performance electro-thermal heater needs not only excellent thermal conductivity but high electric conductivity with the aim of a lower operating voltage to generate heat continuously and effectively. The graphene-poly(vinyl alcohol) composite film with carbon nanotubes (CNTs) network structure had been fabricated which has outstanding electrical conductivity and electric heating ability. The influence of CNTs on the electrical conductivity and electro-thermal ability of the composite film materials was investigated by adjusting the ratio of CNTs to Gr. The results show that the Gr sheets and CNTs were successfully connected by chemical bonding using 3-aminopropyltriethoxysilane. The sheet resistivity of Gr/CNTs composite film decreases significantly with the improvement of CNTs content. Besides, the sheet resistivity of Gr/CNTs composite film decreases gradually with the bending times increase. The voltage of 7.0 V can generate a temperature of 143.7 °C, which is not only a human-safe voltage, but also within the support range of most portable power sources. Accordingly, the thin Gr/CNTs composite film supplies a new and simple method preparation of the flexible electro-thermal heater.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 5
·1-16
·
IF 23.2
Ge Fangqing,Peng Jun,Tan Jialing,Yu Weidong,Li Yuning,Wang Chaoxia
Flexible wearable heater plays a critical role in maintaining a consistent human body temperature, particularly during outdoor activities in cold environments, where garment elasticity, stretchability, and mechanical strength are paramount. Thus, there is an urgent demand for the development of flexible wearable heaters. In this study, we have successfully engineered a photo-thermochromic elastic fiber with control over its color properties via a continuous wet-spinning process. Through the incorporation of a modest amount (as little as 0.5%) of photothermally active polyaniline (PANI) and polydopamine (PDA) nanoparticles, this fiber exhibits exceptional photothermal conversion performance compared to pure thermoplastic polyurethane (TPU) fiber. Notably, when exposed to 600 W m −2 irradiation for 600 s, the equilibrium temperature of the photo-thermochromic elastic fiber rises impressively from the ambient 20.0 °C to 53.5 °C. A significant feature of this fiber is its reversible color-changing capability, which can be conveniently controlled by manipulating the light source. This innovative characteristic empowers the user to monitor the fiber’s temperature by observing its color shifts. Furthermore, the fiber boasts exceptional stretchability, with an impressive elongation capacity of up to 500%, and remarkable resistance to washing, enduring up to 25 cycles. Taking this innovation further, we integrate the fiber into a fabric that maintains its superior photothermal conversion performance, mechanical resilience, and the ability to undergo reversible color changes when exposed to sunlight. This stretchable and vibrant photo-thermochromic elastic fiber holds significant promise as an energy-efficient alternative and is poised to find exciting applications in the realm of smart textiles.
研究领域:
材料科学
·
纺织工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）