FOOD CHEMISTRY
·
2025
·
IF 9.8
Xiang-Shu Hu,Xin Jing,Jing-Wen Mei,Fu-Xiang Liu,Pei-Yong Feng,Jiayi Xu,Yue-Jun Liu
Hydrogels have emerged as ideal materials for sensor fabrication due to their tunable mechanical properties, flexibility, and biocompatibility. However, their high-water content makes them prone to freezing at low temperatures, which compromises their conductivity and mechanical integrity, limiting their use in cold environments. To address this issue, we present a novel hydrogel system consisting of a polyacrylamide (PAM) backbone, a binary solvent system of water and ethylene glycol (EG), and functional materials including polyvinyl alcohol (PVA) and modified MXene. The addition of modified MXene as a conductive filler significantly enhances the hydrogel's conductivity, enabling it to maintain its performance even at low temperatures. Furthermore, the introduction of EG effectively lowers the freezing point of the hydrogel to −36.9 °C, ensuring robust frost resistance. The resulting hydrogel not only shows exceptional low-temperature stability but also exhibits high sensitivity. Moreover, the hydrogel demonstrates rapid responsiveness and high accuracy when being integrated as sensors to detect human motion and ammonia concentrations. These results highlight the potential of MXene-enhanced hydrogels for applications in freshness detection of raw meat and human motion tracking, particularly in cold environments.
研究领域:
材料科学
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传感器技术
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
Science China-Technological Sciences
·
2024
·Vol. 67
·期 12
·3801-3811
·
IF 4.4
Bai YiJie,Tang TianQi,He YuRong
Smart windows, capable of dynamically regulating indoor heat, offer a promising avenue for effectively reducing energy consumption. Hydrogel-based smart windows are excellent at thermal modulation and daylighting, but they are difficult to commercialize globally due to problems like winter ice formation, which can affect thermal insulation, daylighting, and structural integrity, as well as an impractical cloud point temperature ( t cp ). To solve these issues, a ternary anti-freezing system consisting of ethylene glycol (EG), glycerol, and water is proposed. With the t cp regulated at 31.6°C, the system strikes a balance between outstanding daylighting (91.89%) and solar modulation ability (78.32%). Furthermore, the system shows resilience even below −30.0°C and long-term stability, which qualifies it for use in densely populated regions even with severely cold weather. To further illustrate the distinct impacts of EG and glycerol, the optical characteristics and t cp of binary systems containing EG and water as well as glycerol and water were examined. The durability test includes severely cold temperature of −30.0°C and solar exposure temperature of 60.0°C. This work would offer insights to advance the field’s understanding of anti-freezing capability modification in smart windows and advance the development of environmentally and energy-efficiently designed buildings.
研究领域:
材料科学
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能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 14
·4753-4765
·
IF 6.4
Haiyang Liao,Wenzhao Zhong,Jieling Han,Yeqi Xiao,Tieming Xiao,Xiao Sun,Guixin Cui,Jie Huang
Presently, it is necessary to develop fully flexible sensors for the next generation of wearable electronics, and in this case, hydrogel-based flexible sensors are highly attractive due to their unique mechanical performances. However, the low-temperature freezing and bending fatigue of hydrogels severely hinder their application in flexible sensors. Herein, a polymeric dual-function hydrogel (DF-hydrogel) integrating self-healing and anti-freezing properties was prepared by building a dual dynamic network for application as ionic skin with excellent and reliable sensing performances. In DF-hydrogel, ethylene glycol (EG) and disulfide bonds were anchored in the molecular structure of double-bond-capped water-based polyurethane crosslinkers (DB-waPU) and subsequently introduced into the molecular backbone of the hydrogel via free radical polymerization. A multi-hydrogen bonding network was formed by the copolymerization of acrylamide with 2-ureido-4[1H]-pyrimidinone (UPy)-functionalized 1-vinylimidazole ionic liquid. Due to the dual dynamic network, DF-hydrogel exhibited exceptional self-healing capabilities and mechanical properties such as high healing efficiency, stretchability, compressibility, and self-adhesion. The anchored EG molecule in the polymer backbone endowed the hydrogel with intrinsic freeze-resistance without compromising its mechanical properties. The introduced poly(ionic liquid) provided free ions to the hydrogel, enhancing its ionic conductivity up to 9.6 mS cm−1 in the absence of applied electrolyte salts. The DF-hydrogel-based ionic skins exhibited rapid, reversible, and dependable resistance changes with a wide range of strain sensing capabilities (10–300%). Moreover, a prototype 2D sensor array was fabricated to detect strains or pressures in two dimensions, strongly showing potential for the preparation of electronic skin, touch-pads, biosensors, and other 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
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Sheng Zhang,Junyin Cheng,Bo Song,Shun Linghu,Yijun Tang,Qing Li,Lei Chen
Winter sports have gained popularity in recent years. These sports and activities, however, come with some health concerns, particularly in harsh and extremely cold conditions. A self-heating, flexible, and smart conductive material that can monitor body health in extreme conditions would thus be highly desirable. Inspired by the structure of a spider-web, a flexible pressure sensor was developed by depositing a CNTs/CuS composite coating on a fabric surface with a cellulose-entangled structure constructed by hydroxypropyl methyl cellulose (HPMC). The obtained flexible pressure sensor demonstrated stable physiological signal detection and temperature insensitivity during photothermal heating, attributed to the water-retention capacity of HPMC. In addition, it exhibited excellent electrical conductivity (resistance of 10 Ω cm−1), deicing (181s), sterilization (≈99.99%), UV resistance (UPF ≈ 13 926), environmental adaptability (−78 °C to 50 °C) and high sensitivity (13.25 ± 0.123 kPa−1). This coating process can be applied to various garments, offering new possibilities for designing and preparing wearable multifunctional sensors.
研究领域:
材料科学
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生物医学工程
·
智能纺织品
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Jia Yang,Qiong Kang,Bin Zhang,Xiyu Tian,Shuzheng Liu,Gang Qin,Qiang Chen
Ionic conductive hydrogel-based sensors have been capturing growing attention in various areas, but still cannot satisfy the operating requirements of next generation wearable electronics. Herein, inspired by biosystems, we demonstrate ionic conductive supramolecular hydrogels with simple one-step method based on salting-out effect and multiple hydrogen bond interactions. The supramolecular hydrogels exhibit high toughness and strength, quick self-recovery, high sensitive sensing performance as well as good self-healing, fatigue and frost resistances in mechanical and sensing properties, and can monitor large and subtle movements and physiological activities of the human body sensitively, quickly and stably. Thus, it provides a convenient and promising way to obtain stretchable sensors of excellent comprehensive properties, which have tremendous application potential as wearable electronic devices in harsh environments.
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
Small
·
2024
·
IF 13
Jiajun Yang,Guang Liu,Kaiteng Zhang,Ping Li,Haipeng Yan,Yu Yan,Yingdong Zheng,Zehui Zhao,Liwen Zhang,Xiaolin Liu,Guang Yang,Huawei Chen
Precisely controlling the directional motion trajectories of droplets on anisotropic 3D functional surfaces has great application potential in self-cleaning, drug delivery, and droplet power generation, but it also faces huge challenges. Herein, inspired by the microcone structure in the heart of sunflowers, a nanoneedle-modified microcone array surface (NMAS) is reported. The surface is created using a combination of nanosecond laser direct engraving and electroforming and is subsequently fluorinated. Through programmable control of the laser spot, the geometric parameters and inclination angle of the microcone can be quickly and finely adjusted, thereby achieving precise control of the droplet bouncing trajectory. The results show that droplets can achieve programmable multiple bouncing behaviors on patterned functional surfaces, including gravity-defying hopping and directional water transport. It is worth noting that this functional surface has delayed freezing and anti-freezing effects. Furthermore, this functional surface has a wide range of potential applications, including surface self-cleaning, droplet capture, and droplet-based chemical microreactions, especially in the field of anti-icing operations. This opens up a new way for the directional transport of droplets on biomimetic functional surfaces.
研究领域:
材料科学
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仿生学
·
表面工程
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Chao Yang,Dalie Liu,Sheng Wang,Shiyu Zhou,Yan Lv,Yihua Ni,Zhongjin Ni
Flexible hydrogels have received significant attention for their excellent mechanical properties, fast response and good strain sensitivity. However, relatively little research has been conducted on the investigation of hydrogels that exhibit frost resistance, water retention, and transparency characteristics. In this paper, a new flexible strain sensors material was prepared by introducing calcium chloride (CaCl 2 ) and hydrolysed keratin (HK) into the polyvinyl alcohol (PVA) system through complex chemical bond. The PVA/CaCl 2 /HK hydrogel exhibited excellent mechanical properties, with a tensile strength of 1.578 MPa and a maximum strain of 934 %. Moreover, it showed high transparency, with a transmittance of up to 90 %. The hydrogel demonstrated remarkable water retention properties with about 8 hours of dry resistance under constant temperatures of 40 °C, 60 °C, 80 °C and 100 °C. Additionally, it had excellent frost resistance with a glass transition temperature of −23 °C, making it environmentally tolerant and capable of maintaining long-term stability. Notably, during the experiment, the PVA/CaCl 2 /HK hydrogel exhibited excellent electrical conductivity and self-powered performance, with a power supply capacity of approximately 14.6 mV. The results of this work provide a promising direction for the development of electronic materials for powered hydrogel strain sensors.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Zhihao Yue,Yuanyuan Wang,Zhuyue Lan,Ke Hu,Shitao Shi,Jiayi Zhang,Qingyu Meng,Yujing Nie,Qingfeng Sun,Xiaoping Shen
Ice buildup is a safety hazard for infrastructure, transportation and power lines. However, superhydrophobic anti-icing surfaces as well as traditional mechanical and chemical means can hardly coordinate the high anti-icing efficiency with the durable reusability, energy expenditure or environmental impact. Herein, a sustainable, low-cost and dual-action bilayer bamboo (BLB) sheet is developed by bamboo carbonization and surface hydrogel coating. This BLB laminate consisting of a carbonized bamboo (CB) substrate as photo-absorber and thermal insulator and a gel layer as absorber and heat spreader exhibit highly efficient anti-freezing and de-icing performances by converting solar illumination to heat and ion-specifically inhibiting heterogeneous ice nucleation (HIN). This BLB shows remarkable comprehensive performances of low ice adhesion (τ ice ≈ 0 kPa above −25 °C), good photothermal conversion effectiveness (k T =0.52), great recyclability (switchable dual modes), and enhanced HIN inhibition (T H = −25 °C and t H = 1322 s). We provide the single and synergistic mechanisms governing the photothermal trapping and ion-induced HIN inhibition. We demonstrate the frozen drop melting, ice block self-moving and large-area snow removing efficacy on BLB as a convenient and long-lasting anti-icing biomass-based covering material via laboratory-scale and outdoor experiments.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Mingqiang Hu,Dezhan Ye,Xing Qian,Yanhu Zhan,Xiancai Jiang
Traditional ionic conductive hydrogel was prepared by chemically crosslinking the polymer chains to form network. However, the chemically crosslinked ionic conductive hydrogel usually showed limited elongation at break and high hysteresis during stretching process. Here, a simple strategy of synthesizing fully physically crosslinked ionic conductive supramolecular hydrogel without chemical crosslinker was purposed. Hydrophilic salt not only act as the ion supplier, but also provide the spatial confinement effect to form the completely physically crosslinked hydrogel. Firstly, CaCl 2 was used as the representative salt. The optimal PVA/PAM/CaCl 2 ionic conductive hydrogel (PPC), showed excellent tensile performance (2400.3 ± 140.63 %), anti-freezing performance (−28.8 °C), high conductivity (4.8 ± 0.01 S/m), excellent stability at room temperature, low hysteresis, and high transparency. The conductivity of PPC showed no sensitivity to the tensile strain. This innovative combination enables PPC ionic conductive hydrogel to have extraordinary versatility. The flexible all-solid-state supercapacitor assembled with PPC ionic conductive hydrogel as the electrolyte has a high area specific capacitance (136.9 mF/cm 2 ). The prepared supercapacitor can maintain good stability under certain tensile deformation (The capacitance retention rate was 87.7 % when stretched at 200 %). Moreover, other high hydrophilic salts including LiCl, ZnCl 2 , MgCl 2 and AlCl 3 were used to prepare ionic conductive PVA/PAM hydrogel to verify the universality of this preparation method.
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
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Daijun Chen,Xiaoli Zhao,Xinran Wei,Jialin Zhang,Dan Wang,Hao Lu,Pengxiang Jia
Conductive hydrogels have shown great potential in the field of flexible strain sensors. However, their application is greatly limited due to the low conductivity and poor mechanical properties at subzero temperatures. Herein, an ultrastretchable, tough, antifreezing, and conductive cellulose hydrogel was fabricated by grafting acrylonitrile and acrylamide copolymers onto the cellulose chains in the presence of zinc chloride using ceric ammonium nitrate as the initiator. The resulting hydrogel exhibited ultrastretchability (1730%), excellent tensile strength (160 kPa), high elasticity (90%), good toughness (1074.7 kJ/m3), and fatigue resistance property due to the existence of dipole–dipole and multiple hydrogen-bonding interactions on the hydrogel network. In addition, the introduced zinc chloride endowed the cellulose-based hydrogel with remarkable electric conductivity (1.54 S/m) and excellent antifreezing performance (−33 °C). Finally, the hydrogel showed high sensitivity and stability to monitor human activities. In summary, this work presented a facile strategy to construct conductive hydrogel with excellent antifreezing and mechanical properties simultaneously, which showed great potential for wearable strain sensors.
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
Advanced Sensor Research
·
2024
·Vol. 3
·期 11
·2400063
·
IF 0
Ruxue Yang,Shaolin Zhao,Zhantong Tu,Haowen Hu,Xiyue Chen,Xin Wu
Recently, significant progress has been made regarding conductive hydrogels-based flexible sensors in health detection, electronic skin, soft robots, etc. However, the requirement of bonding with the substrate through the adhesive tape, brokenness sensitivity, and degradation of performance under low-temperature environments, strongly limit the wide applications of conductive hydrogels in flexible sensors. To solve these problems, this study introduces lithium chloride (LiCl) into poly(vinyl alcohol)/tannic acid/polyacrylamide (PVA/TA/PAM) hydrogels to endow the hydrogels with excellent conductivity and antifreeze properties. In addition, the addition of tannic acid (TA) and zwitterionic 3-[Dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azaniumyl]propane-1-sulfonate (SBMA) enables the hydrogel to have good self-healing performance (after 72 h of healing at 20 °C, the healing efficiency of fracture stress is 24%, and the healing efficiency of fracture strain is 52%) and adhesion (the adhesion strength to paper at 20 °C is 14.12 KPa). The sensors based on PVA/TA/PAM composite hydrogels exhibit good sensibility, stability, and durability, and can respond quickly to human joint activities (finger bending, wrist bending, arm bending, and leg bending). Therefore, the multifunctional PVA/TA/PAM composite hydrogel demonstrates significant potential for applications in flexible strain sensors under extreme environments.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
DOI
Small
·
2025
·
IF 12.1
Yuan Guo,Yuping Duan,Shude Gu,Xiaoji Liu,Zeng Fan,Huifang Pang,Lujun Pan
The rational design of the aerogel pore structure facilitates the maximum excitation of the materials physicochemical properties, which enables the modulation of their electromagnetic performance. However, the controllable adjustment of the aerogel pore structure remains a significant challenge. Here, the freeze-thawing process and thermal annealing treatment are introduced to prepare reduced graphene oxide (rGO)/iron (Fe)/carbon nanocoil (CNC) aerogels. The composite aerogels with tunable pore structure are obtained by adjusting the content of CNC. Both experiments and simulations confirm that the pore structure with the addition of CNC presents a continuous 3D conductive network, which improves the conductivity loss and polarization loss. Meanwhile, the amorphous carbon structure within the CNC causes structural defects, which further enhance the polarization loss. Therefore, the rGO/Fe/CNC aerogel with optimized pore structure has lightweight and efficient electromagnetic wave absorption. At an ultra-low filling ratio of 0.8 wt%, the effective absorption bandwidth reaches 7.9 GHz and the optimal reflection loss is −43.5 dB. In addition, due to the 3D continuous network interwoven of aerogels and the temperature stability of carbon nanomaterials, composite aerogels have excellent thermal insulation, antifreeze performance, and hydrophobicity. This multifunctional absorber has great potential for application in complex and changing electromagnetic environments.
研究领域:
材料科学
·
电磁学
·
热力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）