ACS Applied Electronic Materials
·
2024
·
IF 4.3
Dawei Gu,Guanglun Luo,Guangshan Zhou,Yimin Zhou,Yuanyuan Lou,Yi Liang,Yongwu Peng,Pengfei Shen,Baisong Pan,Guinan Chen,Bangchun Wen
Piezoresistive sensors hold promising prospects in various fields such as health monitoring, human–computer interaction, and robot sensing. To meet diverse application requirements, the development of multifunctional piezoresistive sensors possessing high sensitivity, mechanical robustness, and thermal insulation properties is imperative. In this study, we report the fabrication of a high-performance MXene-based aerogel, denoted as MXene/CNC/WPU, via unidirectional freeze-casting of cellulose nanocrystals, waterborne polyurethane, and Ti3C2Tx MXene, facilitated by hydrogen bonding. The resulting three-dimensional interconnected layered microstructure imparts the MXene/CNC/WPU aerogel-based piezoresistive sensor with remarkable features including high piezoresistive linear sensitivity (224.42 kPa–1), exceptional mechanical stability (up to 500 compressing cycles), and rapid response time (0.15 s), along with the ability to withstand compression strains of up to 80% (corresponding to 42 kPa). Furthermore, the piezoresistive sensor demonstrates real-time detection capabilities for various human physiological signals such as swallowing, blowing, finger and wrist bending. Moreover, the MXene/CNC/WPU aerogel, with a thickness of 1.5 cm, exhibits outstanding thermal insulation performance, generating a temperature gradient of approximately 150 °C at 210 °C. These remarkable attributes underscore its potential applications in health monitoring and high-temperature protection.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hui-Ya Wang,Deyun Liu,Kaina Zhang,Chen Qian,Yubin Dong,Naharullah Jamaluddin,Juan Matmin,Yaofeng Zhu
Intelligent microwave absorption (MA) materials capable of dynamic regulation are becoming an urgent challenge owing to increasingly complex application conditions. The desirable shape memory polymer enables porous structure with self-fixable and recoverable mechanical deformation. Herein, helix carbon nanotubes/polyaniline/polyurethane aerogels (HCNTs/PANI/WPU, HPWA) were developed through directional freezing. Both component modulation and shape transformation are simultaneously constructed to achieve dynamically adjustable MA property under mechanical deformation responses. Specially, smart HPWA-2 possesses the minimum reflection loss ( RL min ) of –65.58 dB and effective absorption bandwidth (EAB) of 3.13 GHz at a simulated thickness of 3.95 mm. More importantly, HPWA-2 achieves dynamically tunable MA property with RL min of –39.9 dB and EAB of 2.84 GHz in original shape, while it obtains unexpected RL min of –66.6 dB and EAB exceeding 4.2 GHz as varying compression strain to 20 %. The real-time regulation of RL min and EAB along with frequency is attributed to adjustable complex permittivity driven by compressing and releasing of pore channels based on micro-capacitor theory. The hydrogen bonding between PANI and WPU strengthens the porous walls to ensure stable shape deformation and recovery. Besides, the radar cross section reduction reaches –39.74 dB∙m 2 when the incidence theta is 0°. This integration of MA property and shape memory effect would provide another insight for designing intelligent absorbers.
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高影响因子
POLYMER
·
2024
·
IF 4.1
Yanghang Liu,Heyu Zhang,Tao Zhang,Yuefei Ding,Siqi Zhang,Dan Yu,Wei Wang
Gas sensors are crucial in various applications such as environmental monitoring, industrial safety, and air quality control. However, many of these sensors still encounter significant challenges, including complex fabrication processes, low sensitivity, and poor stability. This study presents the development of a novel photochromic sensor using spiropyran (SP), waterborne polyurethane (WPU), and cellulose nanofiber (CNF) aerogel, aiming to overcome these challenges and provide highly sensitive detection of acidic gases. Under ultraviolet (UV) irradiation, the SP component in the aerogel isomerizes to its open-ring merocyanine (MC) form, which is further protonated to protonated merocyanine (MCH) in the presence of acid vapors. Systematic testing reveals that the SP/WPU/CNF aerogel sensor exhibits a rapid response time of 20 s under UV light irradiation and retains 75 % of its photoresponsivity after 20 cycles, demonstrating excellent durability. Additionally, the sensor exhibits a response time of 20 s to acidic gases, with a color change from purple to yellow when exposed to HCl gas at concentrations as low as 1 ppm. After undergoing five protonation and recovery cycles, the sensor maintains a certain level of acid responsiveness. These exceptional properties highlight the potential of the SP/WPU/CNF aerogel-based sensor to be a highly sensitive, efficient, and stable solution for acidic gas detection.
研究领域:
材料科学
·
环境科学
·
化学工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yonghuan Zhao,Yang Meng,Pengxiang Yu,Xiaoxiao Hu,Juanjuan Su,Jian Han
The demand for photothermal fabrics requires more efficient photothermal nanoparticles and more stable interface binding fastness. Nanohybrid coating is considered as used as an efficient method to reach the goal. In this study, a nanohybrid of reduced graphene oxide-zinc-aluminum layered double metal hydroxide (RGO-LDH) was filled to WPU coating to prepare the photothermal textiles. RGO-LDH nanohybrid was surface modified by polydopamine (PDA) to improve the dispersion in WPU. In comparison to the pure WPU film, the WPU nanocomposite film exhibited enhanced water resistance, mechanical properties, and scratch resistance with the inclusion of nanohybrid filler at a 1 wt% concentration. Furthermore, the nanohybrid/WPU coated fabric showed excellent anti-ultraviolet (anti-UV) and photothermal conversion performance. The surface temperature of the nanohybrid/WPU coated fabric rose to 64 °C when exposed to a xenon lamp. After undergoing various durability tests including wearing, washing, folding, and bending, it was confirmed that the modified fabric had outstanding photothermal stability. This work provides a new strategy to fabricate the photothermal textile with excellent warming effect and weather resistance.
研究领域:
材料科学
·
纺织工程
·
纳米技术
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DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Yuanzhang Jiang,Xuyi Wang,Yanting Han,Dakai Gong,Yingchun Gu,Lin Tan
Waterborne polyurethanes (WPUs) are known for their eco-friendliness and adaptability in various industries. However, the quest for multifunctional materials has created a demand for WPUs with self-healing, recyclable, and antimicrobial properties. In this study, we introduce a universal approach to doping FeCl 3 and poly(acrylic acid) (PAA) into carboxyl group containing WPUs that promotes dynamic coordination bonding between Fe 3+ and -COO - groups of PAA and WPUs. WPU/Fe/PAA-5.5 with 5.5 wt % PAA stands out with excellent mechanical properties, strong self-healing capabilities and an impressive >90% antimicrobial rate. Importantly, these supramolecular films proved to be highly recyclable by facile hot-pressing, which can maintain good antimicrobial properties after multiple cycles. This research will shed light on the multifunctionalization of WPU.
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高影响因子
Bioactive Materials
·
2020
·
IF 8.724
Mingxue Chen,YangYang Li,Shuyun Liu,Zhaoxuan Feng,Hao Wang,Dejin Yang,Weimin Guo,Zhiguo Yuan,Shuang Gao,Yu Zhang,Kangkang Zha,Bo Huang,Fu Wei,Xinyu Sang,Qinyu Tian,Xuan Yang,Xiang sui,Yixin Zhou,Yufeng Zheng,Quanyi Guo
Tissue engineering provides a promising avenue for treating cartilage defects. However, great challenges remain in the development of structurally and functionally optimized scaffolds for cartilage repair and regeneration. In this study, decellularized cartilage extracellular matrix (ECM) and waterborne polyurethane (WPU) were employed to construct WPU and WPU-ECM scaffolds by water-based 3D printing using low-temperature deposition manufacturing (LDM) system, which combines rapid deposition manufacturing with phase separation techniques. The scaffolds successfully achieved hierarchical macro‐microporous structures. After adding ECM, WPU scaffolds were markedly optimized in terms of porosity, hydrophilia and bioactive components. Moreover, the optimized WPU-ECM scaffolds were found to be more suitable for cell distribution, adhesion, and proliferation than the WPU scaffolds. Most importantly, the WPU-ECM scaffold could facilitate the production of glycosaminoglycan (GAG) and collagen and the upregulation of cartilage-specific genes. These results indicated that the WPU-ECM scaffold with hierarchical macro‐microporous structures could recreate a favorable microenvironment for cell adhesion, proliferation, differentiation, and ECM production. In vivo studies further revealed that the hierarchical macro‐microporous WPU-ECM scaffold combined with the microfracture procedure successfully regenerated hyaline cartilage in a rabbit model. Six months after implantation, the repaired cartilage showed a similar histological structure and mechanical performance to that of normal cartilage. In conclusion, the hierarchical macro‐microporous WPU-ECM scaffold may be a promising candidate for cartilage tissue engineering applications in the future.
研究领域:
组织工程学
·
再生医学
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DOI
PubMed
高影响因子
POLYMER
·
2020
·
IF 4.231
Zhuo Zhao,De-Ming Guo,Teng Fu,Xiu-Li Wang,Yu-Zhong Wang
The flame-retardant waterborne polyurethane (WPU) has attracted more and more attentions from academia and industry. However, the addition of conventional flame retardants into WPU will damage the emulsion stability and introduce the potential further risk to demulsification and preparation failure. In this work, a novel flame-retardant approach is proposed, demonstrating outstanding efficiency, excellent compatibility and minimized side effect. A water-soluble ionic liquid 1-methyl-3-((6-oxidodibenzo[c,e] (Akindoyo et al., 2016; Chattopadhyay and Raju, 2007) [1,2]oxaphosphinin-6-yl)methyl)-1-H-imidazol-3-ium-4-methylbenzenesulfonate ([Dmim]Tos) is applied as the additive flame retardant for the WPU dispersions. The resulting WPUs (WPU/[Dmim]Toses) display excellent flame retardancy via a low loading content (max 6.0 wt%) and potential adhesion applicable to industries, while maintaining the major comprehensive performance, including storage stability, mechanical property, thermal stability, transparency, hydrophobicity , etc. Effort from this work, besides of overcoming the explicit drawback, also serves as reference of novel methodologies to solve the compatibility issue between additive agents and WPU.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.9
Pengyu Li,Xiaohua Feng,Yi Liu,Hua Li
Thick microwave-absorbing coatings are essential for electromagnetic stealth and protection applications. However, during thermal spraying processes, the microstructural evolution induced by increasing coating thickness and cumulative thermal exposure significantly alter the dielectric response and absorption performance – a phenomenon that has not been systematically clarified. This study systematically examines the thickness-dependent dielectric behavior of TPU/MWCNTs coatings fabricated via flame spraying, revealing that absorption performance deteriorates sharply beyond a critical thickness of 50 μm. Specifically, as the coating thickness increases from 50 μm to 138 μm, the minimum reflection loss ( RL min ) decreases from −24.8 dB to −14.1 dB, and the effective absorption bandwidth ( EAB ) narrows from 5.2 GHz to 1.0 GHz. To address this issue, an innovative porous structure engineering strategy is proposed, wherein WPU replaces TPU and a water/ethanol co-solvent is employed to promote the formation of vertical pores within the coating. This approach significantly enhances the connectivity of conductive fillers along the thickness direction, effectively balancing polarization loss and conductive loss while optimizing both impedance matching and attenuation. The optimized porous coating achieves an exceptional RL min of −50 dB, an EAB of 5.2 GHz, and a maximum RCS of 29.8 dBm 2 . This structural design strategy not only mitigates the performance degradation in thick coatings but also provides a viable route for fabricating lightweight, broadband, and highly efficient microwave-absorbing coating.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Pengzhen Jin,Chunyan Hu,Jian Zheng,Zhijia Zhu,Baojiang Liu
Addressing global energy and freshwater scarcity requires sustainable, integrated technologies. Inspired by sunflower's water transport mechanisms, we developed a hydrophilic composite aerogel based on polyvinyl alcohol (PVA), chitosan (CS), and waterborne polyurethane (WPU). Incorporating carboxylated multi-walled carbon nanotubes (c-MWCNTs) yielded the BMPCW aerogel, a bifunctional system for simultaneous solar desalination and hydrovoltaic power generation. This design synergizes the aerogel's interfacial evaporation properties with c-MWCNTs' conductivity and photothermal conversion, significantly enhancing water/ion transport and energy conversion efficiency. Under 1 kW m −2 simulated sunlight, the system achieved a high freshwater evaporation rate of 3.41 kg m −2 h −1 and generated an open-circuit voltage of 125.2 mV in 3.5 wt% sodium chloride (NaCl) solution. The BMPCW aerogel exhibits excellent chemical stability, renewability, and maintains robust performance over multiple cycles. Aerogel array devices successfully demonstrated applicability in seawater desalination and powering small electronics. This work highlights the aerogel's potential for distributed energy, smart agriculture, and offshore applications, offering a novel biomaterial strategy and feasible pathway for sustainable clean water and green energy co-production.
研究领域:
材料科学
·
可再生能源
·
环境工程
·
纳米技术
·
可持续技术
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Zecheng Cao,Xiaojiao Kang,Wei Lü,Hongcheng Wang
With the advancement of economic development and the increasing complexity of commodity distribution, efficient and precise anti-counterfeiting measures have garnered significant attention in recent decades. This challenge necessitates the development of flexible films exhibiting both superior mechanical and optical properties to accommodate various anti-counterfeiting applications. This study introduces a composite film comprised of waterborne polyurethane (WPU), gelatin quantum dots (QDs), and glycerol. Glycerol, employed as a plasticizer, enhances the film's plasticity by disrupting hydrogen bonds within the matrix. The tensile strength decreased from 7.7 MPa to 1.73 MPa, while the elongation at break increased from 410 % to 656 %, compared to the samples without glycerol. The resulting films exhibit advantageous properties, including facile preparation, high transmittance, excellent optical properties, and excellent mechanical performance. Additionally, the photoluminescence intensity decreased by only 15 % after being placed in air for 30 days. They demonstrate commendable stability under ambient temperature and environmental conditions, making them suitable for diverse and intricate anti-counterfeiting applications. The emission wavelength of the composite films was tuned by adjusting the cation ratio of the QDs, and the mechanical properties can be adjusted by varying the QD and glycerol contents. This work offers valuable insights for the development of advanced flexible materials for anti-counterfeiting purposes.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 34
·13875-13887
·
IF 4.5
Cheng Hengyi,Zuo Tongcheng,Chen Yixiang,Yu Dan,Wang Wei
With the advent of an ageing society, wearable strain sensors have great prospects for applications in artificial intelligence, motion detection and healthcare, and have attracted much attention from researchers. But the challenges of poor wear comfort, low sensitivity and clumsy appearance still greatly limited their practical applications. To address these problems, a facile strategy for the fabrication of fibrous strain sensors by wet spinning is proposed. Polyvinyl alcohol/waterborne polyurethane/MXene (PVA/WPU/MXene) is the main component to construct the conductive part of the fiber-based materials and aqueous calcium chloride solution is used as a coagulation bath in the spinning process. The relevant physicochemical properties of the resulting conductive fibers were characterized and tested. Though the facile wet-spinning process, an effective conductive network was achieved in the prepared stretchable sensor with excellent mechanical properties and chemical stability and can be woven into various fabric forms according to practical demanding. It was demonstrated that a sensitivity of 5.61 could be obtained with an elongation at break of over 358%. In addition, the sensing and weaving properties of the composite fibers were characterized, and application performance was measured by placing them on the elbow, wrist, and knee. As a result, the PVA/WPU/MXene composite fiber strain sensor displays a linear response, good sensitivity and cyclic stability and has great potential for wearable strain sensors and flexible strain sensors in complex environments
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yanru Yuan,Yingfan Li,Xu Peng,Dong Zhang,Ziyi Xu,Peiyi Gao,Jinghe Guo,Bohan Ding,Yanxiang Wang
With the rapid development of flexible electronics and wireless communication technologies, lightweight and flexible electromagnetic interference (EMI) shielding materials are in high demand. However, conventional homogeneous MXene/polymer composites often exhibit excessive surface reflection and insufficient internal electromagnetic attenuation. In this work, a tannic acid-modified MXene (TA@MXene)/waterborne polyurethane (WPU) composite film with a thickness-direction asymmetric structure was fabricated through a solution-casting process combining gravity-driven sedimentation and solvent evaporation. TA modification improved the dispersion stability of MXene nanosheets and facilitated the formation of an asymmetric conductive structure within the WPU matrix. The resulting composite film exhibited anisotropic electrical conductivity and effective EMI shielding performance in the X-band. At a TA@MXene loading of 12.5 wt%, the film achieved an EMI shielding effectiveness of 34.3 dB and an SSE/t value of 4975 dB cm 2 g −1 . In addition, the composite film maintained good mechanical flexibility, tensile strength, and improved flame-retardant performance. This work demonstrates an effective strategy for constructing multifunctional MXene-based flexible shielding materials through spatial regulation of conductive networks.
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高影响因子
危险品化学品经营许可证（带存储）