Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 21
·8266-8277
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IF 8.067
Zhihui Xie,Zhuo Chen,Xiangshu Hu,Hao-Yang Mi,Jian Zou,Heng Li,Yuejun Liu,Zhi Zhang,Yinghui Shang,Xin Jing
Hydrogel based flexible sensors have been considered as promising wearable devices in human–machine interactions, which are of great significance in mobile communications, personal healthcare, and intelligent robots. To meet the requirements of practical applications especially in harsh environments, a multifunctional strain sensor was designed and fabricated based on the polydopamine–reduced oxide graphene/poly(3,4-ethylenedioxythiophene):poly(4-styrene sulfonate) (PEDOT:PSS)/polyacrylamide composite organohydrogel (PCOH) using ethylene glycol (Eg)–H2O binary solvent as the replacement medium, which displayed an excellent anti-freezing property (−40 °C for 24 h) owing to the low freezing point of the Eg in the PCOH, high self-healing efficiency (92% tensile strength and 90% elongation at break), excellent stretchability (1350%), high sensitivity (a gauge factor of 3.19 with the strain ranging from 0 to 500%), fast response time (90 ms), long durability (800 cycles), and a wide temperature detection range (−40 °C to 60 °C), respectively. When used as a strain sensor, it was able to detect various human motions such as finger, wrist, and knee movements, and facial micro-expressions. Moreover, we also attached the flexible sensor to the yoga equipment or a neck brace for practical applications, and it could also detect the movements of the human body. Specifically, as a wearable human–machine interface device, a smart glove that takes advantage of the excellent properties of the PCOH was developed for hand gesture recognition via transmitting data to a smart phone with a real-time display via a bluetooth wireless system. Thus, these multifunctional PCOH based strain sensors have broad application prospects in human–machine interactions, sports training, and personal healthcare.
研究领域:
材料科学
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生物医学工程
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柔性电子
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DOI
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Zhiyu Zhang,Sha Liu,Haihu Tan
Hydrogels have broad application prospects in biomedicine, energy, and tissue engineering due to their high water content, adjustable physicochemical properties, and flexibility. In general, the poor stretchability and adhesion of hydrogels limit their application in flexible wearable electronics. In this work, a composite hydrogel (GM hydrogel) with excellent adhesion, stretchability, and conductivity was prepared by a one-pot synthesis process through the hydrogen-bonding interaction between P(AM-co-AA)) and gallic acid (GA). Natural plant polyphenol GA not only enhances the mechanical properties of the hydrogel (maximum tensile strain of 890% and maximum tensile stress of 238 kPa) but also gives the hydrogel adhesion (9 kPa). GM hydrogel can be further used to construct strain sensors and self-powered sensors. GM hydrogel strain sensors can be attached to finger joints to monitor and distinguish the angles of finger joint bending. Self-powered sensors based on GM hydrogels can stably transmit encrypted signals. Therefore, multifunctional GM hydrogels can be used for electronic skin, human motion monitoring, and wearable biosensors.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
Small Methods
·
2025
·
IF 9.1
Lei Wang,Jingrui Li,Meng Zong,Yi Liu,Jianfeng Zhu,Limin Wu,Renchao Che
Fabrication of gel-based microwave absorbers is an effective strategy for overcoming the shortcomings of conventional powder-like absorbers, such as complicated processes and undesirable properties. However, the present gel-based microwave absorbers generally consist of a polymer skeleton and a liquid dispersion medium and suffer from leakage of the dispersion medium. In this study, a novel gel-like poly(ionic liquid) (PIL) microwave absorber with excellent properties is prepared. A maximum reflection loss (RL max ) of −58.8 dB GHz and an effective absorption bandwidth (EAB) of 10.56 GHz are achieved, which is mainly ascribed to high ionic conduction loss derived from lower glass transition temperature (T g ). Furthermore, the prepared PILs consisted of cationic imidazole-containing alkoxy moieties as the polymer chain and bis(trifluoromethanesulfonyl) imide (TFSI − ) as the counter ion in the absence of a dispersion medium. The PILs displayed stretchability and adhesive and self-healing abilities, thus providing a new candidate for developing high-efficiency microwave absorbers for practical applications.
研究领域:
材料科学
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电磁学
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产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2020
·Vol. 12
·期 5
·660-669
·
IF 5.342
Lun Zhang,Dong Wang,Liqiang Xu,Aimin Zhang
Supramolecular elastomers, possessing excellent mechanical, reusable adhesivity, and rapid self-healing properties, are essential for use in various applications. Herein, we developed a novel polyamide-urea elastomer with metal–ligand interactions and hydrogen bonds forming synergetic double dynamic bonds. Physical crosslinking endows the polyamide-urea elastomer with extreme stretchability and rapid self-healing ability at room temperature. The representative polyamide-urea elastomer, DPPy1–Fe2, can be stretched to 40× its original length without breaking, and has extraordinary notch-insensitive elongation of up to 3500%. Meanwhile, DPPy1–Fe2 can fully restore its elasticity modulus within 5 min at room temperature, and the elongation also reaches 3000% after 30 min of healing. In addition, the unique dynamic bonds of the supramolecule enable it to repeatedly and firmly adhere to different surfaces. The shear strength of DPPy1–Fe2 is restored to an appreciable 80% after the first detachment–reattachment cycle, with it still possessing excellent adhesive strength after multiple cycles. As a result, the supramolecular elastomer shows outstanding stretchability, tear-resistance, quick self-repairing, and reusable adhesivity, which will facilitate the progress of intelligent adhesivity and flexible electronics.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Shuai Sun,Yijiao Xue,Xiaodong Xu,Liping Ding,Zhen Jiang,Linghui Meng,Pingan Song,Yongping Bai
It has been highly desirable to develop high-performance thermoplastic polyesters that are strong, tough, and highly stretchable, in addition to high glass transition and excellent optical properties. The performance portfolio is essential for the practical applications of polyesters in high-end areas of aerospace, energy, medical sterilization, and optics. However, current material design strategies have failed to endow polyesters with such integrated performances. Herein, we report the facile synthesis of modified copolyesters with multiple hydrogen bonds (H-bonds) on the main chains via condensed polymerization. The resultant copolyester records a break strain as high as 438% and a large toughness of 106.7 MJ/m3, representing the most stretchable and toughest thermoplastic polyesters so far, while exhibiting a high tensile strength of 59.6 MPa because of intermolecular multiple H-bonding. In addition to achieving an enhanced glass transition temperature (∼85.9 °C), the copolyester films exhibit improved postcrystallization optical transparence and good flexibility due to the grain refinement effect. This work provides an innovative design concept to prepare a new class of advanced polyesters with outstanding mechanical, thermal, and optical properties, thus holding great promise for many potential industrial applications.
研究领域:
材料科学
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高分子化学
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光学材料
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Lin Guan,Yongqi Yang,Fei Jia,Guanghui Gao
Photochromic hydrogels have attracted considerable attention owing to their potential application in optical devices. However, the weak mechanical properties severely limited their applications. Here, a novel photochromic hydrogel with high transparency, high stretchability and rapid photochromic responsiveness has been successfully designed and prepared by introducing a redox photochromic material (Mo) into the hybrid hydrogel. The photochromic hydrogel with rapid photochromic response achieved discoloration process within only 3 s and the fading process could be easily performed under the air environment. Moreover, the ability to rewrite and erase optical information have been implemented on the photochromic hydrogels. Therefore, this strategy of photochromic hydrogel would contribute to design a new generation of optical display devices.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2022
·
IF 13.443
Jinmeng Li,Tian Xu,Zheng Ma,Wang Li,Yongxin Qian,Yang Tao,Yinchao Wei,Qinghui Jiang,Yubo Luo,Junyou Yang
Thermoelectric power generators have attracted increasing interest in recent years owing to their great potential in wearable electronics power supply. It is noted that thermoelectric power generators are easy to damage in the dynamic service process, resulting in the formation of microcracks and performance degradation. Herein, we prepare a new hybrid hydrogel thermoelectric material PAAc/XG/Bi 2 Se 0.3 Te 2.7 by an in situ polymerization method, which shows a high stretchable and self-healable performance, as well as a good thermoelectric performance. For the sample with Bi 2 Se 0.3 Te 2.7 content of 1.5 wt% (i.e., PAAc/XG/Bi 2 Se 0.3 Te 2.7 (1.5 wt%)), which has a room temperature Seebeck coefficient of −0.45 mV K −1 , and exhibits an open-circuit voltage of −17.91 mV and output power of 38.1 nW at a temperature difference of 40 K. After being completely cut off, the hybrid thermoelectric hydrogel automatically recovers its electrical characteristics within a response time of 2.0 s, and the healed hydrogel remains more than 99% of its initial power output. Such stretchable and self-healable hybrid hydrogel thermoelectric materials show promising potential for application in dynamic service conditions, such as wearable electronics.
研究领域:
材料科学
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能源技术
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生物医学工程
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产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2021
·
IF 6.988
Yajie Zhong,Farzad Seidi,Chengcheng Li,Zhangmin Wan,Yongcan Jin,Junlong Song,Huining Xiao
Hydrogels as a wound dressing, integrated with ultrastretchability, rapid self-healing, and excellent antimicrobial activity, are in high demand, particularly for joint skin wound healing. Herein, a multifunctional and ductile composite hydrogel was developed using poly(vinyl alcohol) (PVA)-borax gel as a matrix that was synergized or dual-reinforced with dopamine-grafted oxidized carboxymethyl cellulose (OCMC-DA) and cellulose nanofibers (CNF). Moreover, neomycin (NEO), an aminoglycoside antibiotic with multifunctional groups, was incorporated into the hydrogel network as both an antibacterial agent and a cross-linker. The dynamic reversible borate ester linkages and hydrogen bonds between OCMC-DA, PVA, and CNF, along with dynamic cross-linking imine linkages between NEO and OCMC-DA, endowed the hydrogel with excellent self-healing ability and stretchability (3300%). The as-reinforced networks enhanced the mechanical properties of hydrogels significantly. More remarkably, the composite hydrogel with improved biodegradability and biocompatibility is pH-responsive and effective against a broad spectrum of bacteria, which is attributed to the controllable release of NEO for steady availability of the antibiotic on the wound location. Overall, the antimicrobial hydrogel with rapid self-healing and reliable mechanical properties holds significant promise as dressing material for wound healing.
研究领域:
生物材料学
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医学工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2023
·
IF 4.6
Guoqiang Lu,Chao Li,Guohua Wang,Jun Nie,Xiaoqun Zhu
Conductive hydrogels have drawn significant attention in the field of stretchable sensors. However, the freezing and drying of water, the introduction of additional ions and ions leakage made the preparation process relatively complicated and significantly limited their long-term stability and safety. In this work, Poly (vinyl alcohol) – based organo-hydrogels were fabricated via photodimerization and freezing-thawing (F-T) cycles of the mixed solution of Polyvinyl alcohol bearing styrylpyridinium group (PVA-SBQ) and Poly (vinyl alcohol) (PVA). The as-prepared PVA-SBQ/PVA organo-hydrogels possessed good stretchability (389%), facture strength (0.39 MPa), conductivity (3.1 *10 −4 S/cm at 25 ℃ and 4 *10 −5 S/cm at −30 ℃) and temperature tolerance (−30 ℃). And the organo-hydrogels displayed a gauge factor of 1.6 at a strain of 100% and a low degree of hysteresis (5.34% at 100% strain). In addition, the as-prepared organo-hydrogels exhibited good low temperature sensing performance, which could monitor strain at − 30 ℃, making the organo-hydrogel suitable for use in the field of strain sensors. Therefore, it is believed that the PVA-SBQ/PVA organo-hydrogels offer a promising prospect for practical applications.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Jingwen Dong,Yuezhan Feng,Kang Lin,Bing Zhou,Fengmei Su,Chuntai Liu
Electromagnetic interference (EMI) shielding fabrics are crucial in addressing the increasingly serious electromagnetic pollution. To meet wearable requirements, stretchability and thermal comfortability are often desired, but which still are challenging. Herein, a stretchable EMI shielding fabric is fabricated via electrospinning coupled with biaxial pre-stretching spraying, in which a block stacking wrinkled silver nanowire (AgNW)/Ti 3 C 2 T x MXene network is coated on one side of electrospun thermoplastic polyurethane (TPU)/polydimethylsiloxane (PDMS) fabric. As expected, the wrinkled structure protects conductive network from fracture during stretching process, so as to realize the strain-invariant electrical conductivity. Thus, the fabric exhibits a stretchable EMI shielding performance of over 40 dB when subjected to 10–50% uniaxial strains or 21–125% biaxial strains. More importantly, the white TPU/PDMS side and the black AgNW/MXene side enable the fabric passive radiative cooling and heating, respectively. The cooling side exhibits high mid-infrared emissivity (97.5%) and solar reflectance (90%), thus reducing the skin temperature by ≈4.9 °C. The heating side with high solar absorptivity (86.6%) and photothermal effect increased the skin temperature by ≈5 °C. Therefore, the fabirc with stretchable EMI shielding and Janus-type dual-mode personal passive thermal management is promising in future wearable products.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jie Ren,Yunbin Wang,Zhihan Liu,Kai Liu,Xu Xiang
In non-ionic conductive hydrogels, conductivity often conflicts with mechanical properties, posing a challenge in creating hydrogels that strike a balance between conductivity and mechanical properties. Here, we addressed this issue by integrating carboxylated carbon nanotube (CNT) layers in a sandwich structure onto the surface of the cationic hydrogel (P(AM- co -DMDAAC), PAD), followed by dehydration for densification. This approach simultaneously improved the conductivity of the hydrogel while maintaining its stretchability. The stability of the composite structure was ensured through electrostatic interactions, hydrogen bonding, and physical entanglement between the PAD hydrogel and the CNT layer. Additionally, adjusting the water–solid ratio of the hydrogel allows fine-tuning of its conductivity and stretchability. Remarkably, at a 500 % water–solid ratio, the hydrogel achieved a conductivity of 2.3 S/m. By further reducing the water content, the conductivity could be increased to 25 S/m, significantly higher than similar hydrogels. The PAD-CNT hydrogel found applications in swelling response, tunable resistance wires, and as strain sensors. Notably, the sandwich structure enables the PAD-CNT hydrogel to output capacitive signals, exhibiting a more sensitive response in monitoring human movement. Overall, this study introduces a novel composite structure for conductive hydrogels, holding tremendous potential in flexible conductivity and smart response fields.
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 APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Leixin Liu,Shanshan Yuan,Chenxi Guan,Jian Zhou,Yi Yao,Qiliang Zhang,Fangli Gang
Hydrogen sulfide (H 2 S), as a toxic gas, is one of the occupational hazards to workers' health. Traditional H 2 S sensors often suffer from external circuits, measurement systems, liquid-phase reactions, or high detection limits. Herein, a colorimetric sensor for H 2 S detection was developed by incorporating colorimetric dye [lead acetate, Pb(OAc) 2 ] into polyacrylamide (PAM)/polyvinyl alcohol (PVA) hydrogel. Benefitting from the interpenetrating polymer network, non-covalent interactions such as hydrogen bonds and dense internal structure, the hydrogel exhibited excellent adhesion to different substances (adhesion strength up to 14.11 kPa) and mechanical properties (tensile strength up to 116.92 kPa, elongation rate up to 576%). Furthermore, due to the liquid-phase reaction system and excellent [Pb(OAc) 2 ] loading capacity provided by the hydrogel, the prepared sensors exhibited excellent sensing performance response time, sensitivity, and simplicity. The theoretical detection limit of the sensor was 0.69 ppm, and the minimum exposure time required for detection was 14 s. The colorimetric effect of the hydrogels was positively correlated with the addition of Pb(OAc) 2 and the extension of time. The results showed that the color change of PAM/PVA/Pb(OAc) 2 hydrogel can be visible to the naked eye even if the concentration of H 2 S is only 1 ppm. It is expected that this hands-free, arbitrarily adhesive, stretchable hydrogel colorimetric sensor strategy for visual detection of H 2 S will extend toxic gas alarm systems to a new level.
研究领域:
材料科学
·
环境科学
·
生物医学工程
✓ 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）