POLYMER
·
2022
·
IF 4.432
Sizhao Zhang,Jing Wang,Kunming Lu,Guangyu Xu,Zhao Wang,Yunyun Xiao,Hui Ji,Zhouyuan Yang,Yue Yang,Shixian Xiong,Zhengquan Li
Polybenzoxazine (PBZ) aerogels are potential thermal insulation and ablative material for thermal protection system in aerospace. However, obtaining the excellent properties of thermal insulation and compression strength remain a formidable challenge at an extreme temperature. Here we proposed a new strategy by optimizing the nanoporous networking structure and pore size distribution to prepare PBZ aerogel (PAs-Fx), which could be self-extinguished in 0.24 s only once departing the outer flame, and the compressive stress of PAs–F10 reached up to 6.62 MPa at the strain of 10%. PAs–F10 presented great advantage in thermal insulation property (although the hot surface existed in the atmosphere at 302.4 °C, the temperature of cold surface remained at only 112.4 °C when heat flow was stable). Even burning the hot surface with 1200 °C outer flames for 30 min, the highest temperature of the cold surface only reached 254 °C at the heat balance state, moreover, the prominent shape-keeping property was confirmed after ultra-high temperature burning. We also found that PAs–F10 has superior compressive strengths which are 5.52 and 9.38 MPa at 10% strain in the conditions of ambient temperatures for 150 and −50 °C, respectively. PAs-Fx could also retain the excellent compression property after treating cryogenically in liquid nitrogen (−196 °C). The work would be a great promise in the application of ablative thermal insulation materials in a great measure in the future.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Runze Jin,Donghui Guo,Lijie Qu,Baosheng Xu
Toughening of epoxy resin (EP) is a common topic in the research of high-performance matrix for advanced composite materials. When the material is at extreme temperatures, the toughening requirements of EP will become more prominent. To this end, we designed a multi-scale interface to improve the strength and toughness of an EP at extreme temperatures simultaneously. A multi-scale interface layer was fabricated within the EP system using CuO nanorods (NRs) and epoxy-based cage-type polysiloxane (EP-POSS) as the toughening phase. By changing the content of CuO NRs and EP-POSS, regulating the multi-scale interface structure between the two, thereby further regulating the mechanical properties of the system. When the relative contents of the CuO NRs and EP-POSS were 1:1, the mechanical properties of EP/NP-CuO were optimised at room temperature(RT) and 77 K. The tensile strength increased by 75.9 % and 97.3 %, respectively, compared to the pure EP. The fracture toughnesses increased by 83.1 % and 58.9 %, respectively, compared to the pure EP. The improvement in mechanical performance is mainly attributed to the multi-scale interface structure between NP-CuO and EP, which effectively consumes the energy and stress required during deformation.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Tianyi Dai,Bo Zhang,Jing Wang,Jiajia Deng,Junbin Xu,Hongbing Jia
Wearable strain sensors have aroused myriad of interest in the domain of electronic skin, soft robotics, and biomedicine. Organogels for wearable strain sensors require desirable stretchability, sensing stability, self-healing property, and a wide working temperature range. However, the synthesis of such organogels typically involves complex and time-consuming processes. Herein, we proposed a rapid copolymerization method for organogels composed of poly(acrylic acid- co -acrylic amide) (P(AA-co-AM)), phytic acid (PA), liquid metal (LM), and polyethylene oxide (PEO). The dispersion of GaInSn in PA solution (GaInSn-PA) was synthesized and employed to initiate the copolymerization of acrylic acid (AA) and acrylic amide (AM), which significantly reduced polymerization time to 2–3 min at room temperature. The release of Ga 3+ ions from the LM facilitated cross-linking of P(AA-co-AM) chains through coordination bonds, while also imparted conductivity to the organogel. The synergistic effect between hydrogen bonds and metal coordination bonds extensive within the polymer chains imparted exceptional stretchability (1079 % strain) and self-healing efficiency (98 % at 60 °C) to the organogel. Consequently, the resulting strain sensor demonstrated the ability to accurately monitor both subtle and large human motion, exhibiting remarkable repeatability and durability across a wide temperature range (-20 °C∼40 °C). In addition, the integration of strain sensors on limbs for robotic control through limb movements underscored its practical viability. This optimized fabrication approach and structural design strategy set a new precedent for the development of organogel strain sensors in various applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Zhenming Li,Junfang Zhang,Yu Li,Haoyang Jiang,Jianguo Tang
Hydrogel skin-like sensors, widely applied in wearable electronics, have attracted considerable attention due to their feasibility, tissue-like compliance, and biocompatibility. However, freezing intolerance, moisture evaporation and less durability in the extreme environments would result in performance degradation (signal-sensing disturbance and low sensitivity). Herein, an ionogel with extreme temperature (-80℃-100℃) tolerance, fatigue durability was developed and exhibited high sensitivity in a wide working range (-30℃-80℃) as the temperature and strain sensor. The ionogel was prepared by a facile one-step polymerization method from a homogeneous pre-gel solution containing ionic liquid, monomers and crosslinkers. The tough ionogel exhibited high strength (1.25 MPa), mechanical enhancement (50 %) and good fatigue resistance (100 % strain for 1000 cycles). When assembled into the wearable strain and temperature sensor, it effectively detected various human motions through electrical signal outputs. Owing to the thermal stability of ionic liquid, the ionogel exhibited excellent long-term cyclic sensing performance. Furthermore, it exhibits high temperature sensitivity (TCR= −1.57 %/℃), freezing and thermal tolerance, meanwhile maintaining reliable sensing capability in the temperature range of −30℃-80℃. Thus, the ionogel could realize the wide temperature range detection in extreme environments, providing an innovative solution to the healthcare monitoring, artificial intelligence, and sensory devices.
研究领域:
材料科学
·
生物医学工程
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Cuiwen Liu,Ru Zhang,Peiwen Li,Jinqing Qu,Pengjie Chao,Zongwen Mo,Tao Yang,Ning Qing,Liuyan Tang
Hydrogel strain sensors with extreme temperature tolerance have recently gained great attention. However, the sensing ability of these hydrogel strain sensors changes with temperature, resulting in the variety of output signals that causes signal distortion. In this study, double-network hydrogels comprising SiO2 nanoparticles composed of polyacrylamide and phytic acid-doped polypyrrole were prepared and applied on strain sensors with a wide sensing range, high adhesiveness, and invariable strain sensitivity under flame and cold environments. The hydrogels had stable conductivity, excellent adhesive strength of up to 79.7 kPa on various substrates, and high elongation of up to 1896% at subzero temperature and after heating. They also exhibited effective flame retardancy with low surface temperature (71.2 °C) after 1200 s of heating (200 °C) and antifreezing properties at a low temperature of −20 °C. Remarkably, even under cold temperature and heat treatment, the hydrogel-based strain sensor displayed consistent sensing behaviors in detecting human motions with a broad strain range (up to 500%) and steady gauge factor (GF, ∼2.90). Therefore, this work paves the way for the applications of hydrogel sensors in robotic skin, human–mechanical interfaces, and health monitoring devices under harsh operating environments.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2023
·Vol. 10
·期 5
·1865-1874
·
IF 13.3
Guohui Yang,Xiaofang Zhang,Ruijia Wang,Xu Liu,Jianming Zhang,Lu Zong,Hongsheng Yang
Graphene aerogels (GAs) possess workable deformation and sensing properties at extreme temperatures. However, their poor tensile properties have restricted their applications in stretchable electronic devices, smart soft robots, and aerospace. Herein, an ultra-stretchable and elastic graphene aerogel with record elongation from −95% to 400% was achieved by constructing a highly crimped and crosslinked graphene network using a microbubble-filled GA precursor by a simple compress-annealing process. This conductive aerogel with near zero Poisson's ratio showed rubber-like but temperature-invariant elasticity from 196.5 °C to 300 °C, and special strain insensitivity from 50% to 400% tensile strain and high sensitivity below 50% tensile strain. Therefore, it can be used as a highly stretchable but strain-insensitive conductor under extreme environments, in which these polymer-based stretchable conductive materials are not workable. Moreover, this work provides new thoughts on constructing inorganic ultra-stretchable materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhilin Chen,Jia Chen,Xianbo Hou,Liming Chen
The development of flexible and foldable aerogels for thermal protection in harsh environments has been a long-term challenge as high porosity and weak interface connection can result in typical brittleness. Herein, a remarkable polymerization-regulated strategy was proposed to prepare polyimide (PI) aerogel films with high flexibility and efficient thermal insulation in extreme temperatures by using a facile phase-separation (PS-PI films) method. The polymerization degree of monomers was innovatively used to regulate the flexibility and mechanical properties of PS-PI films by slightly regulating the proportion of monomers. The results showed that the PI aerogel film realized the transition from brittleness to high flexibility, and the tensile strength and fracture strain of PS-PI films were increased by 3 times (11.7 MPa) and 4 times (18.7 %), respectively. Besides, a finite element model was established to analyze the tensile deformation process, revealing the destruction mechanism of aerogel film. The prepared PS-PI film also exhibited robust mechanical properties and efficient thermal insulation properties at extreme temperatures (−130 to 300 °C). The developed PS-PI film possessed high flexibility and efficient thermal-insulated performance at extreme temperatures, which could be a potential candidate for thermal protection in aerospace, energy, and buildings.
研究领域:
材料科学
·
航空航天工程
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 7
·2201509
·
IF 6.8
Rixuan Wang,Picheng Chen,Xinjie Zhou,Luyang Sun,Guoqing Wang,Yuetao Liu,Chuanhui Gao
Ionic conductors have a wide range of development prospects in the field of flexible wearable electronics. The polymerizable deep eutectic solvent is more economical, resistant to extreme temperature, and less toxic than the traditional hydrogels and ionic liquids. In this paper, the supramolecular eutectic gel is prepared by introducing glycol/choline chloride deep eutectic solvent into acrylamide/choline chloride deep eutectic solvent as “hydrogen bond cross-linking density regulator”. Deep eutectic solvents give eutectic gels the ability to resist the low (-25 °C) and high (60 °C) temperatures. By introducing 2-acrylamido-2-methyl-1-propanesulfonic acid into the gel, the adhesion ability of gel on copper sheet can reach 90 kPa and shows good reusability. Due to the complex hydrogen bond interaction in the gel, it has good mechanical properties (strain up to 2300%, stress up to 0.21 MPa). In addition, the ionic conductivity of the gel can reach 0.22 ms cm −1 due to the presence of choline chloride. In addition, since the polymerization is triggered quickly under UV light, this allowed us to print gels of any shape on any surface. Such deep eutectic gels with self-adhesion, intrinsic conductivity, excellent mechanical properties and extreme temperature resistance may have a wide range of applications in the field of motion sensors.
研究领域:
材料科学
·
柔性电子
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yi Zhu,Ling Lin,Yu Chen,Yeping Song,Weipeng Lu,Yanchuan Guo
Flexible sensors based on conductive hydrogel show great potential in electronic skin and human–machine interface. However, pure water in hydrogel inevitably freezes or rapidly evaporates under extreme temperatures, leading to inadequate fulfillment of sensor performances. Herein, a well-designed strategy is reported for fabricating extreme temperature-tolerant gel-based sensors. By immersing a gelatin/polyacrylamide (PAAm)–clay composite (GC) hydrogel into a ZnCl2/water/glycerol system, a phase-transition-tunable gel (PTTGC gel) is obtained with outstanding antifreezing (−82 °C) and long-lasting moisture (70 °C, more than 40 days) properties. Meanwhile, the gel also presents good antibacterial activity and biocompatibility attributing to Zn2+ and gelatin, respectively. Then, a dual-response sensor with a wide operating temperature (−60 to 60 °C) is proposed, presenting high stress and temperature sensitivities and long-term stability. The sensor will meet the needs of the human–machine interface for scientific investigation and data monitoring in polar, desert, etc.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemical Science
·
2025
·
IF 7.4
Zhongming Wang,Zhiyuan He,Zhongsheng Wang,Kecheng Long,Jixu Yang,Shaozhen Huang,Zhibin Wu,Lin Mei,Libao Chen
In overcoming the barrier of rapid Li+ transfer in lithium-ion batteries under extreme temperatures, the desolvation process and interfacial charge transport play critical roles. However, tunning the solvation structure and designing kinetically-stable electrode-electrolyte interface to achieve high-rate charging and discharging remains challenges. Here, a lithium nonafluoro-1-butanesulfonate (NFSALi) additive is introduced to optimize a stability and robust solid electrolyte interface film (SEI), realizing the rapid Li+ transfer process and the structural integrity of electrode materials. The NFSALi-derived thinner, fluorine-rich, and sulfur-containing SEI in nitrile-assistant carbonate electrolytes effectively suppresses decomposition of valeronitrile solvent during high-rate cycling and wide-temperature operation (−40~55 ℃). More importantly, the graphiteǁLiNi0.5Co0.2Mn0.3O2 pouch cell demonstrates a capacity retention of 66.88% after 200 high-rate cycles with 3 C charging and 5 C discharging at a high-temperature condition of 55 °C. This work provides significant guidance to develop inorganic-rich interfacial chemistry for lithium-ion batteries under extreme operating conditions.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 7
·2829-2842
·
IF 8.1
Yang Wenke,Liu Hu,Du Houyi,Zhang Minyue,Wang Chunfeng,Yin Rui,Pan Caofeng,Liu Chuntai,Shen Changyu
Pressure sensors represent the cornerstone of artificial tactile sensing. Extensive research has been conducted on high-performance pressure sensors; however, the realization of high sensitivity, wide linear response range, and wide working temperature range remains a tremendous challenge. Here, triethylamine was innovatively applied to achieve the homogeneous dispersion of hydrophobic polyimide fibres (PIFs) in a carbon nanotube (CNT) aqueous dispersion without deteriorating the structure of the fibres, and a robust and superelastic spider web-like PIF/CNT conductive composite aerogel was developed using the freeze-drying and thermal imidization technique for a pressure sensor with a wide linear sensing range (0.01–53.34 kPa), ultralow detection limit (10 Pa), high sensitivity (0.507 kPa −1 ), fast response/recovery time (85/80 ms), stable fast compression response (500 mm min −1 ), and excellent cyclic fatigue resistance (5000 times). Finite element analysis indicates that the hierarchical fibrous network induces a significant linear variation in the contact area between adjacent conductive fibres upon external pressure and contributes to the excellent linear sensing capacity. The pressure sensor is demonstrated to be applicable in human physiology and motion signal detection, electronic skin, and intelligence control. Notably, it also exhibits amazing sensing stability and thermal insulation under extreme temperature conditions, demonstrating much promise for emerging applications such as the sensing unit for space suits and inflatable structures for future lunar/Mars habitats. This work provides a simple but powerful strategy for developing next-generation linear pressure sensors.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Baotian Qiu,Xiudi Xiao,Gang Xu,Guoping Dong
Self-powered electrochromic devices (defined as SECDs) driven by metal electrodes have attracted wide attention due to their low voltage, low energy consumption characteristics, and getting rid of the limitation of external power supplies. However, the applicability in extreme temperature environments is severely hampered by the inadequate choice of electrochromic electrolytes. Herein, we adopt the ethylene glycol-assisted salty PVA-type hydrogel electrolyte with a minimum freezing point as low as −50 °C. Based on the hybrid Zn 2+ and Al 3+ , the ion conductivity of hydrogel electrolyte at room temperature is 1.56 mS cm −1 , and the fracture strain can exceed 300%. The hydrogel electrolyte can maintain average transmittance of 95% within a wide temperature range of −40 °C–60 °C. After freezing at −30 °C, the breaking elongation can reach 352%, and the tensile strength is up to 4.45 MPa. Based on the W 18 O 49 films and the hydrogel electrolyte, the modulation of the SECDs can reach 63%, and the cycle life is more than 1000 times. After building the flexible device, the modulation of the flexible SECDs based on the PEN/ITO substrate is 51% at 25 °C and 43% at −40 °C. What's more, the flexible SECDs can be tailored and worked normally without packaging, which can promote the development of the cryogenic and tailorable application of the flexible SECDs.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 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）