Materials Today Chemistry
·
2022
·
IF 7.613
S. Cai,G. Zhang,L. Wang,T. Jian,J. Xu,F. Su,Y. Tian
Fluorescent sensors with low detection limits and fast responses have caused significant attention for their application in medical diagnoses. Herein, we described the construction of ratiometric nanofibers (NFs) for sensing breath ammonia (NH 3 ), which was an important biomarker for Helicobacter pylori ( Hp ) affection, by integrating of a ‘turn on’ fluorescent probe of fluorescein (FLU, green emission) and a ‘turn off’ fluorescent probe of difluoroboron-curcumin analog (BFC, red emission). Such NFs were constructed by coaxial electrospinning using thermoplastic polyurethane (TPU) with FLU as the shells and polyvinyl pyrrolidone (PVP) with BFC as the cores. The core/shell structures of NFs provided independent channels for the chosen fluorophores and enabled the sensor with low humid interferences, high mechanical properties and outstanding NH 3 sensing performance. This nanofibers-based sensor showed superior sensitivity with an NH 3 theoretical detection limit of ∼7.16 ppb, quick response time of ∼2.2 s, high selectivity and reversibility for NH 3 , and excellent stability in various conditions, especially under high humid conditions. Furthermore, because of the use of two probes with reverse sensing trends in the red and green emitting windows, the ratiometric sensor showed clear color changes when tracing NH 3 , which was visualized by eyes and cameras easily. Preliminary tests for Hp infection subjects showed that the NH 3 changing levels before and after urea-pill ingestion were much higher than those healthy subjects. Thus, an appropriate combination of polymeric matrixes with NH 3 -sensitive probes in the form of dual-emission coaxial NFs as the ratiometric sensor is expected to be used as a simple approach/tool for monitoring trace NH 3 concentrations and broadening the sensing design strategy.
研究领域:
医学诊断
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材料科学
·
生物化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Wenxuan Zhao,Biao Zhao,Zhengchen Wu,Ke Pei,Yuetong Qian,Kaicheng Luo,Chunyang Xu,Min Liu,Min Wang,Jincang Zhang,Renchao Che
Intrinsically conductive polymers have attracted much attention in the electromagnetic interference (EMI) shielding field because of their high conductivity and favorable flexibility. Delocalized π-electrons migrating along the conjugated long-chain structures can form a current. Based on this special conductive mechanism, the doping process significantly influences the conductivity and EMI shielding efficiency (SE). However, it is challenging to investigate the influence of the doping process on EMI shielding performance, which would enable the optimization of dopant selection. In this study, dopant engineering was explored for controllable conductivity, EMI SE, and mechanical properties. Polypyrrole (PPy) doped with various dopants serves as a conductive coating owing to its adjustable conductivity and abundant functional groups. Elastic thermoplastic polyurethane was chosen as the porous framework because of its high tensile strength, and magnetic nanoparticles supplied the magnetic loss in the 3D network. Eventually, the composite film showed the best properties when PPy was doped with sodium p-toluenesulfonate. The film exhibited an average SE of 26.3 dB in the X band and a specific SE of 1563.17 dB cm2 g–1 with a thickness of merely 0.2 mm. This film withstood a tensile stress of 16.0 MPa, while the breaking elongation ratio reached 538.0%. After 10,000 cyclic bending, 92.3% of the EMI shielding property was retained. In summary, this study highlights the most suitable dopant for EMI shielding applications and provides a prospective alternative for advanced, flexible, and smart devices.
研究领域:
材料科学
·
电子工程
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Ting-Ting Li,Sheng Chu,Xianjin Hu,Hai-Tao Ren,Ching-Wen Lou,Jia-Horng Lin
In extreme environments, the simultaneous requirements of puncture resistance, acid and alkali resistance, and chemical corrosion resistance are crucial for the design of safety protection materials. To address these requirements, this study employed a “scratch coating” technique, combining modified silica nanoparticles (nano F–SiO2) and thermoplastic polyurethane elastomers (TPU) with aramid fabrics. This approach ensured that the composites were both soft and puncture resistant. Additionally, a simple and cost-effective spraying method was utilized to create a multifunctional coating comprising nanosilica, micron-polytetrafluoroethylene (PTFE), and fluorinated alkyl silane. Furthermore, the study investigated the effect of different lamination angles of the fabric on puncture resistance. The results demonstrated that the soft composite exhibited outstanding puncture resistance, resistance to strong acids and bases, and super-double sparsity. Notably, the maximum puncture resistance reached 515.50 N, which was 33.02 times higher than that of the pure fabric (15.61 N). Similarly, the maximum knife puncture resistance reached 247.42 N, representing a 10.77-fold increase compared to that of the pure aramid fabric (22.97 N). Notably, the obtained coating demonstrated outstanding superhydrophobicity with a water contact angle of 163.8° and a sliding angle of 3.2°. It exhibited remarkable durability when immersed in acidic or basic solutions for 120 h and exposed to outdoor conditions for more than 30 days. Importantly, the micronano coating displayed exceptional stability even when subjected to highly corrosive chemicals such as concentrated sulfuric acid (98%) and sodium hydroxide (40%) for up to 12 h. In summary, this study introduces a novel approach and method for designing flexible puncture-resistant composites with multifunctional properties. It offers valuable insights and contributes to advancements in the field of protective materials..
研究领域:
材料科学
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防护材料
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纳米技术
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Xin Jin,Deli Li,Haoxuan Fu,Baoyun Sun,Yanhai Yang,Naisheng Guo,Jiupeng Zhang
Research on asphalt fatigue and self-healing performance can more accurately model the damage and self-healing evolution principles in practical applications. In order to analyze the rationality of evaluation indexes based on rheology to evaluate the self-healing properties of TPU modified asphalt, a dynamic shear rheometer (DSR) was used in this study to perform time, temperature, and frequency sweep tests of TPU modified asphalt for analyzing the fatigue self-healing properties of TPU modified asphalt over a broader range of temperatures and loading frequencies. This method can improve the accuracy of the fatigue failure determination criteria of TPU modified asphalt and clarify the material performance parameters of TPU asphalt modifiers. The results showed that the increase in hard segment content ( C h ) and isocyanate radical index ( r ) can effectively alleviate the decrease in shear deformation resistance of modified asphalt caused by the increase in N (load repetition). N f50 (the number of loads when the normalized modulus drops to 0.5) is more suitable to evaluate the fatigue life of TPU modified asphalt compared with N p20 (the number of loads when the DER - N curve is offset by 20% deviation from the linear undamaged line) and N 2 (the number of load times corresponding to the intersection point of the tangent line of the DER – N fitted curve and the undamaged line). The degree of self-healing will also increase with the increase in C h and r . Besides, the higher the healing temperature and the healing time, the longer the fatigue life. The effects of the self-healing evaluation index ( HI ) on the self-healing index of TPU modified asphalt were as follows: healing temperature > healing time > soft segment > C h > r > degree of damage > degree of aging > deg r ee of self-healing.
研究领域:
材料科学
·
土木工程
·
道路工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Lei Xing,Linze Li,Yu Liu,Junyi Ren,Guilei Guo,Yifan Chen,Yu Zheng,Bin Sun
Fibrous yarn-based wearable devices have attracted increasing interest in human motion detection. However, challenges remain in the fabrication process and the sensing performance of fibrous yarns. In this work, a highly stretchable graphene (GR)/thermoplastic polyurethane (TPU) strain sensor was prepared based on one-step electrospun TPU nanofibrous yarns. Owing to the electrical conductive pathways constructed by GR, the strain sensor exhibits a large strain range (>140%), a high sensitivity of 46.19, and an excellent durability after more than 10 000 stretching–releasing cycles. With these outstanding properties, textiles based on the strain sensor can be adopted for monitoring various human motions. Moreover, the precise position of an object on the textile can be accurately detected. With a safe temperature of 37.8 °C for the human skin under the maximum operating voltage, the strain sensor shows great potential for the next generation of wearable electronics.
研究领域:
材料科学
·
电子工程
·
生物医学工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Ruiqi Liu,Fu Wan,Bowen Liu,Penghui Ai,Shufan Li,Da Yang,Weigen Chen
Stretchable wearable electronics urgently require safe, flexible, and high-energy–density storage solutions. Aqueous zinc-ion batteries (AZIBs) show great promise due to their inherent safety, low cost, and environmental friendliness. Nevertheless, their large-scale practical implementation is hindered by unconstrained Zn dendrite growth and undesirable parasitic reactions occurring on Zn anodes. To mitigate these limitations, we developed a composite gel electrolyte based on thermoplastic polyurethane and polyvinyl alcohol (TPU/PVA). The semi-interpenetrating polymer network (semi-IPN) formed between TPU and PVA synergistically enhances both mechanical robustness and ionic transport. The electrolyte exhibits high ionic conductivity (42.7 mS cm −1 ) and Zn 2+ transference number (0.83). Its mechanical toughness suppresses dendrite growth, while polar groups promote uniform Zn deposition via solvation regulation. The Zn//Zn symmetric cell achieves stable cycling for more than 2500 h at 0.5 mA cm −2 , and runs for 2400 h at −20 °C. For the Zn//MnO 2 full cell, it delivers a specific capacity of 172 mAh g −1 at 5 A g −1 , and retains 95.8% of its initial capacity after 2000 cycles. Flexible pouch cells based on TPU/PVA also display stable performance under bending, highlighting their potential for flexible electronics. This work offers a viable electrolyte design strategy for high-performance, safe, and flexible zinc-ion batteries.
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DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Wei Chen,Xiuchuan Jing,Zhuang Li,Yongxi Ma,Hongda Gu,Haiqing Miao,Zhong Wang,Guohe Wang
Attaching flexible resistive strain sensors to human skin enables response detection of behaviours towards real-time physiological monitoring. However, current flexible resistive strain sensors hinder themselves from practical applications due to their low sensitivity, small linear working range, and poor wearing comfort. In this research, a conductive thermoplastic polyurethane (TPU) membrane is fabricated using TEMPO modified nanocellulose (TNC) decorated with carbon quantum dots (CQDs) to prepare flexible highly sensitive, and breathable strain sensors. Results show that the mechanical property and strain response range of the TPU membrane is significantly enhanced by CQDs-TNC. The TPU membrane also exhibits the highest sensitivity (GF= 49.4 in the 30∼80 % strain range) and a wide response range (0–80 %). At 5 %wt of CQDs-TNC, the membrane displays the highest elongation at break (389.8 %) with maximum breaking stress approaching 9.7 MPa. The CQDs-TNC/TPU membrane exhibits fast response and recovery times (85 ms and 93 ms), low hysteresis (8.9 %), and excellent dynamic cyclic strain performance (1000 stretch/release cycles). The CQDs/TMC/TPU-resistive strain sensor (CTT-RSS) sensor well conforms to human joints, and accurately produces real-time regular resistance strain responses based on human movements. In all, this study contributes a novel research design for fabricating flexible and sensitive sensor to the development of smart textiles.
研究领域:
材料科学
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柔性电子学
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纳米复合材料
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可穿戴传感器
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智能纺织品
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Henglong Dai,Mujing Qu,Jiaxin Duan,Jiajun Hou,Haojie Ding,Xiaohong Chen,Huili Li
Rare earth-based perovskite nanocrystals CsEuX 3 (X = Br, Cl, or I) have emerged as an ideal alternative system to toxic lead-based halide perovskites due to the lead-like characteristics of Eu 2+ ions (similar ionic radius, identical valence state and coordination number) and their unique luminescent properties: narrow-band blue emission with a full width at half maximum (FWHM) ≤ 25 nm from 5d→4f transitions. However, the relatively low photoluminescence quantum yield (PLQY) and poor environmental stability especially for CsEuCl 3 nanocrystals have seriously hindered their applications. To address these issues, a dual strategy based on strontium ion (Sr 2+ ) doping and thermoplastic polyurethane (TPU) coating is proposed to synergistically modify CsEuCl 3 nanocrystals in this paper. TPU@CsEuCl 3 :Sr 2+ nanocrystals films with significantly improved environmental stability and PL properties were successfully prepared. The partial substitution of Sr 2+ for Eu 2+ reduces the surface defects of nanocrystals and mitigates the oxidation of Eu 2+ . As a result, the ratio of Eu 2+ /Eu 3+ increases from 3.9% of undoped sample to 6.0% for CsEuCl 3 :Sr 2+ and PLQY correspondingly enhances from 5.04% to 13.88%. Further encapsulation with flexible TPU introduces a hydrophobic surface that effectively blocks the erosion of water and oxygen in the environment on nanocrystals. The ratio of Eu 2+ /Eu 3+ in the TPU@CsEuCl 3 :Sr 2+ nanocrystals film markedly increases from 6.0% to 39.9%, and PLQY slightly improves to 14.02%. Most importantly, the environmental stability of the film is greatly enhanced. After ultraviolet irradiation in air for 150 min, PL intensity of nanocrystal film still retains 69.5% of its initial value, whereas the undoped and uncoated sample completely loses its luminescent properties after only 60 s.
研究领域:
材料科学
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纳米技术
·
光电子学
·
发光材料
·
钙钛矿纳米晶
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yihui Xia,Xiang Zhang,Liangliang An,Yuhui Xie,Feng Wu,Yi Mei,Delong Xie,Dong Feng
A novel, environmentally friendly flame retardant (FB) composite was developed by integrating cross-linked kraft lignin (FSK) and black phosphorus (BP) for thermoplastic polyurethane (TPU) applications. FSK was prepared by C C Friedel-Crafts crosslinking between benzene rings and amino/silanization between hydroxyl groups of lignin. The FB, with an optimal FSK:BP ratio of 7:3 at 1 wt%, significantly improved the flame retardant properties of TPU. It achieved a limiting oxygen index (LOI) of 30.7%, a 91% increase in char residue, and UL-94 V-0 classification, surpassing the performance of pure TPU. Cone calorimeter tests revealed a 21.26% reduction in total heat release (THR) and a 37.06% reduction in peak heat release rate (PHRR). The flame retardancy mechanism involved BP and FSK's crosslinked structure catalyzing the formation of a stable graphitized char layer, while FSK, through its nitrogen and silicon components, released inert gases such as NH 3 /CO 2 , enhancing the stability of the char layer. The synergistic effect provided dual-phase flame retardancy (condensed-phase and gas-phase) at low additive levels, maintaining mechanical properties (tensile strength: 20.1 MPa). This approach, using biomass-derived lignin and low levels of BP, offers an environmentally friendly alternative to traditional flame retardants, making it a promising strategy for high-safety applications.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Zhang Wentong,Cheng Hengyi,Liu Yanghang,Shi Xianhui,Yu Dan,Wang Wei
Strain sensors exhibiting heightened sensitivity and an expansive sensing range has emerged as a pivotal focal point within contemporary research endeavors, but the enhanced sensitivity on fiber-based sensors still needs to be systematically studied. Herein, this paper presents a novel approach to the preparation of high-performance fiber-based flexible strain sensors, which is achieved by firstly dip coated with DMF and then followed with layer-by-layer self-assembly to develop flexible strain sensors. Wrinkles are successfully formed on the surface of the wet spinning polyurethane (TPU) fiber by dip coating with DMF. The good conductive network is constructed with self-assembling with chitosan (CTS) and MXene layers, which giving the sensor excellent sensing capabilities. The high sensitivity is attributed to the obvious wrinkles on the surface of the fiber-based sensor with wide sensing range caused by the polymer chain segments within the TPU. The wrinkled structure provides more contact sites for the attachment of chitosan and MXene, endowing the sensor with higher sensing performance. The layer-by-layer self-assembly method allows for precise control over the number of assembled layers and the optimized sensor exhibits high sensitivity (713.7), a wide detection range (2–200%), fast response (150 ms), and excellent cyclic stability (3200 tensile cycles). Notably, it demonstrates excellent performance in information recognition and motion signal detection, highlighting its potential applications in smart devices and wearable textiles.
研究领域:
材料科学
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纳米技术
·
柔性电子学
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传感器
·
可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Tongtong Sun,Zekai Zheng,Lingling Cheng,Jingjie Hou,Chenglong Hou,Zhongda Feng,Zhen Wang,Jingqiang Cui
This study investigates the clinical challenges associated with conventional catheters, particularly bacterial adhesion and catheter-associated infections (CAI), which are exacerbated by surface hydrophobicity. To address these issues, a functional modification strategy for thermoplastic polyurethane (TPU) catheters was developed, leveraging the complexation between sodium alginate (SA) and the cationic antimicrobial agent poly (hexamethylene biguanide) hydrochloride (PHMB) to construct a dual-functional composite coating system with combined hydrophilicity and antibacterial properties. A hydrophilic coating was first formed on the TPU surface using 3-glycidoxypropyltrimethoxysilane (KH-560) and polyvinylpyrrolidone (PVP), significantly reducing surface hydrophobicity. Simultaneously, the anionic properties of SA were utilized to complex cationic antimicrobial agents, forming a long-lasting antibacterial functional layer. The modified catheter exhibited a reduction in the coefficient of friction from 1.3 to 0.03, corresponding to a 53 % improvement in lubricity. Compared to unmodified catheters, the coating introduction showed no significant impact on maximum tensile force or hardness, but slightly reduced the bending modulus, enhancing adaptability in vascular environments. Zone of inhibition assay confirmed the strong antimicrobial efficacy of the hydrophilic-antibacterial coating against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). Additionally, cytocompatibility and hemocompatibility verified the biosafety of the modified catheters. By optimizing the composite coating modification, this study successfully achieved efficient synergy between hydrophilicity and antibacterial properties in TPU catheters, providing an innovative solution to reduce the risk of CAI.
研究领域:
生物材料
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生物医学工程
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表面改性
·
抗菌技术
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医疗设备
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高分子科学
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产品关联
DOI
高影响因子
RSC Advances
·
2026
·Vol. 16
·期 16
·14123-14134
·
IF 6.1
Wanwan Liu,Huabin Li,Jingjing Xu,Shuangquan Wu,Zhidong Chen
In the field of self-powered sensing, the demand for materials with enhanced wearing comfort and superior flexibility has become increasingly prominent, driven by the rapid advancement of wearable electronics and intelligent monitoring technologies. Although piezoelectric ceramics exhibit exceptional piezoelectric performance, their inherent brittleness and poor deformability severely restrict their practical applicability in flexible self-powered sensors. In pursuit of addressing the requirement for improved wearing comfort while retaining efficient energy conversion capability, elastomer-based composite fibers have emerged as a promising class of materials and developed rapidly in recent years. Nevertheless, a critical challenge remains in achieving uniform dispersion of fillers within the polymer matrix and the fabrication of defect-free composite fibers under high filler loading, primarily due to the significant surface energy discrepancy between the fillers and the polymer matrix. In this work, a novel thermoplastic polyurethane (TPU) based composite piezoelectric fiber with strong organic–inorganic interfacial adhesion and uniform high-content filler dispersion was proposed, achieved by interfacial modification of PZT and in situ reduced Ag nanoparticles (AgNPs) into TPU via wet spinning for flexible wearable piezoelectric sensors. Notably, even at total inorganic filler loadings surpassing 80 wt%, the resultant composite fibers maintain outstanding mechanical properties, with breaking strength >10 MPa and elongation at break >200%. When optimized with 80 wt% PZT and 3 wt% Ag precursor, the composite fibers, after weaving into fabrics and corona polarization, exhibit ultrahigh piezoelectric output sensitivity of 133 ± 2.1 mV N−1 and ultrafast response time (≈20 ms). This work offers a scalable fabrication route for high-performance piezoelectric fibers, which is helpful for self-powered sensors with better performance and more comfortable use in human motion monitoring and recognition.
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）