SURFACE ENGINEERING
·
2018
·
IF 1.978
G. Luo,Z. Jin,Y. Dong,J. Huang,R. Zhang,J. Wang,M. Li,Q. Shen,L. Zhang
The wear resistance and transparency properties of superhydrophobicity are most important issue essential for the application of superhydrophobic materials in industry. In this paper, we successfully prepared good wear resistance PU/SiO2 (polyurethane/silica) composite superhydrophobic coating with the double-step sol–gel route. The PU and SiO2 coating occurs crosslinking reaction forming composite superhydrophobic coating. The superhydrophobic coating surface is characterised by environmental scanning electron microscope and other testing methods, the results show that the PU/SiO2 composite superhydrophobic coating surface has excellent superhydrophobic properties and the Sa value was 332.5 nm. We used the pressure of 5 KPa to verify the wear resistance which the PU/SiO2 composite superhydrophobic coating surface exhibits good wear resistance, the water contact angle (WCA) still remains 138.7° after the abrasion resistance test. The PU/SiO2 composite superhydrophobic coating has high transparency in the visible light. The largest WCA of PU/SiO2 composite superhydrophobic coating could reach 162.1°.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Food & Function
·
2014
·Vol. 5
·期 7
·1520-1528
·
IF 2.907
Ye-wei Huang,Huan-huan Xu,Su-min Wang,Yi Zhao,Yu-min Huang,Run-bo Li,Xuan-jun Wang,Shu-mei Hao,Jun Sheng
Caffeine is present in a number of dietary sources consumed worldwide. Although its pharmacokinetics has been intensively explored, little is known about complexed caffeine (C-CAF) in aqueous extraction of fermented Pu-er tea. The major components of C-CAF are oxidative tea polyphenols (OTP) and caffeine. Furthermore, the C-CAF can be precipitated in low pH solution. After administering the same amount of total caffeine and comparing the peak level of plasma caffeine with the coffee (contains 0.11 ± 0.01% C-CAF) group, the results showed that the caffeine/OTP (contains 66.67 ± 0.02% C-CAF) group and the instant Pu-er tea (contains 23.18 ± 0.02% C-CAF) group were 33.39% and 25.86% lower, respectively. The concentration of the metabolites of caffeine supports the idea that the absorption of the C-CAF was inhibited in mice. Congruent with this result, the amount of caffeine detected in mice excrement showed that more caffeine was eliminated in the caffeine/OTP group and the Pu-er tea group. The locomotor activity tests of mice demonstrated that the stimulating effect of caffeine in caffeine/OTP and Pu-er tea was weaker than in coffee. Our findings demonstrate that caffeine can be combined with OTP and the absorption of C-CAF is inhibited in mice, thus decreasing the irritation effect of caffeine. This may also be developed as a slow release formulation of caffeine.
研究领域:
药理学
·
茶学
·
动物生理学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER SCIENCE SERIES B
·
2025
·
IF 1
Tiantai Kang,Yang Liangjiong,Yang Ying,Jiang Hao,Jiang Yan,Zhang Hongwen
In this study, a new type of raspberry epoxy resin composite particle had been proposed. First, a reaction-induced phase separation method was used to solidify epoxy resin in PPG1000 to prepare homogeneous macromolecular epoxy resin microspheres (EMs). Then, a sol–gel method was used to hydrolyze tetraethoxysilane (TEOS) to prepare nanoparticles of silicon dioxide. In alkaline conditions, the two microspheres were compounded by isocyanate-terminated polyurethane oligomers (PU) to prepare raspberry-shaped EP-PU@SiO 2 composite particles. By adjusting the content of PU, the wettability of the composite particles (110°~156°) can be controlled. The surface morphology of the composite particles was observed via scanning electron microscopy (SEM). The test results indicate that, under the circumstance of the same mass ratio of EMs/SiO 2 , when the content of PU is relatively low, there is essentially no SiO 2 attached to the surface of EMs; when the content of PU is relatively high, a raspberry-like structure is observed. Furthermore, the influence of different EMs/SiO 2 mass ratios on the wettability of the composite microspheres was examined. Although the degree of infiltration may differ slightly, it is not significant. This indicates that PU is the decisive factor in controlling the wettability of the EP-PU@SiO 2 composite particles. When the PU content is 400% and the mass ratio of EMs to SiO 2 is 1 : 1, the static water contact angle of the EP-PU@SiO 2 composite microspheres attains the maximum value of 156.2°.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 25
·期 2
·437-445
·
IF 2.5
Huang Peijun,Liu Yan,Chen Zhuoming,Zheng Yuansheng,Vasilovna Khammatova Venera,Faritovich Gainutdinov Ruslan,Xin Binjie
Polypyrrole (PPy) is one of the most widely researched conductive polymers due to its high electrical conductivity, good thermal and environmental stability, oxygen resistance, heterocyclic structure, non-toxicity, and simple synthesis method, and is an excellent candidate for electric heating materials. For better application in textile heating, a polyurethane (PU) film is used as a substrate and dopamine (PDA) is used as a multifunctional platform for the secondary reaction on the film to immobilize the polypyrrole on the surface of the film, making it a smart wearable element. By varying the amount of PPy to control its direct oxidative polymerization reaction, materials with good electrical conductivity and flexibility were obtained. It has a fast electrothermal response at low operating voltages (up to 118 °C after 20 s at 5 V), good flexibility, light weight and uniform heat distribution. It has significant advantages compared to other electrical heating materials.
研究领域:
材料科学
·
高分子科学
·
电气工程
·
纳米技术
·
化学合成
✓ 已验证
DOI
高影响因子
Symmetry-Basel
·
2025
·Vol. 17
·期 5
·773
·
IF 2.2
Qingfang Zhang,Yi Li,Xingyu Wang,Xiaoyu Zhang,Shuyi Liu,Hengyi Yuan,Xiaodong Yang,Da Li,Zeping Jin,Yujian Zhang,Yutong Liu,Zhengmai Bian
In recent years, flexible piezoresistive sensors based on polydimethylsiloxane (PDMS) matrix materials have developed rapidly, showing broad application prospects in fields such as human motion monitoring, electronic skin, and intelligent robotics. However, achieving a balance between structural durability and fabrication simplicity remains challenging. Traditional methods for preparing PDMS flexible substrates with high porosity and high stability often require complex, costly processes. Breaking through the constraints of conventional material systems, this study innovatively combines the high elasticity of polydimethylsiloxane (PDMS) with the stochastically distributed porous topology of a sponge-derived biotemplate through biomimetic templating replication technology, fabricating a heterogeneous composite system with an architecturally asymmetric spatial network. After 5000 loading cycles, uncoated samples experienced a thickness reduction of 7.0 mm, while PDMS-coated samples showed minimal thickness changes (2.0–3.0 mm), positively correlated with curing agent content (5:1 to 20:1). The 5:1 ratio sample demonstrated exceptional mechanical stability. As evidenced, the PDMS film-encapsulated architecturally asymmetric spatial network demonstrates superior stress dissipation efficacy, effectively mitigating stress concentration phenomena inherent to symmetric configurations that induce matrix fracture, thereby achieving optimal mechanical stability. Compared to the pre-test resistance distribution of 10–248 Ω, after 5000 cyclic loading cycles, the uncoated samples exhibited a narrowed resistance range of 10–50 Ω, while PDMS-coated samples maintained a broader resistance range (10–240 Ω) as the curing agent ratio increased (from 20:1 to 5:1), demonstrating that increasing the curing agent ratio helps maintain conductive network stability. The 5:1 ratio sample displayed the lowest resistance variation rate attenuation—only 3% after 5000 cycles (vs. 80% for uncoated samples)—and consistently minimal attenuation at all stages, validating superior electrical stability. Under 0–6 kPa pressure, the 5:1 ratio device maintained a linear sensitivity of 0.157 kPa−1, outperforming some existing works. Human motion monitoring experiments further confirmed its reliable signal output. Furthermore, the architecturally asymmetric spatial network of the device enables superior conformability to complex curvilinear geometries, leveraging its structural anisotropy to achieve seamless interfacial adaptation. By synergistically optimizing material composition and structural design, this study provides a novel technical method for developing highly durable flexible electronic devices.
研究领域:
材料科学
·
电子工程
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Xinyuan Ye,Leqi Li,Zonglei Wang,Yuli Wang,Jiawei Yang,Meiqiong Zheng,Mingzhe Wang,Zichong Ji,Shihong Lin,Yujie Zhang,Jian Luo,Junhong Yi,Pengcheng Zhou,Xuanwen Cao,Xuezhong He,Yan Wang
Long-term, high-fidelity electrophysiological monitoring requires epidermal electrodes that simultaneously offer conformability, breathability, and mechanical durability─attributes rarely achieved in current designs─through a scalable, simple, and low-cost fabrication strategy. We report a 5.2-μm-thick, transparent, air- and vapor-permeable “tattoo” electrode that adheres to the human skin through water-activated hydrogen bonding provided by a NaCl/glycerol/water hydrating solution, echoing the mechanism of temporary tattoos. The fabrication process is easy, efficient, and scalable. The device consists of a poly(vinyl alcohol) matrix reinforced by an electrospun polyurethane nanomesh, yielding an interfacial area adhesion energy of 2060.8 μJ cm–2, and a low skin contact impedance of 21.0 kΩ at 100 Hz. Unlike conventional hydrogel or dry electrodes, our design needs no external adhesive layer, resists dehydration, and withstands everyday mechanical stress while remaining comfortable to wear. It exhibits an air permeance of 0.94 cm3 cm–2 s–1 cmHg–1, a water-vapor transmission rate of 1856.5 ± 36.9 g m–2 day–1, and survives 1000 cycles of 100% uniaxial strain. The electrode also retains >81.4 ± 1.7% of its initial water content after 7 days of storage and maintains its stretchability, adhesion, skin contact impedance, and conductivity even after 60 days. These properties enable reliable, minimized motion artifact acquisition of biosignals during vigorous activities and extended daily use. Finally, we demonstrate wireless surface electromyogram that tracks muscle-recruitment dynamics during strength-training and rehabilitation exercises, including push-ups and climbing, underscoring the potential of the tattoo electrode for real-world wearable health monitoring.
研究领域:
生物医学工程
·
可穿戴电子器件
·
柔性电子器件
·
生物传感器
·
材料科学
·
生物力学
·
健康监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2025
·Vol. 18
·期 7
·1550
·
IF 3.2
Ke Wang,Weifeng Li,Yumei Long
As an environmentally friendly and clean energy technology, solar-driven interfacial evaporation technology has attracted wide attention. However, organic pollutants can easily pollute distilled water during the evaporation of wastewater. In this work, we report a strategy of N-TiO2/C solar absorption with a low bandgap (2.33 eV), excellent light absorption ability, and high photothermal conversion efficiency (48.2%). Black N-TiO2/C was prepared by the sol-gel method in the presence of hexamethylenetetramine as a source of nitrogen and carbon. The simultaneous N doping and C with superior photothermal effect rapidly increased the surface temperature of the material, reduced the recombination rate of electrons and holes, and improved the photocatalytic activity, showing great potential for solar thermal energy conversion. The prepared solar absorbent and polyurethane (PU) were mixed evenly to form a porous N-TiO2/C/PU (NTCP) foam for purifying water. The evaporator produced clean water at a rate of 1.73 kg m−2h−1under the simulated sunlight of 1 sun irradiation. Meanwhile, the evaporator simultaneously photodegraded methylene blue (MB) and rhodamine B (RhB) underwater at a removal rate > 90%. The bifunctional solar water evaporation device combining photocatalytic and photothermal effects holds great potential for water purification.
研究领域:
环境科学
·
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Zhihua Zhao,Shixin Ma,Abu Bakker Md Rahmatullah,Zhuo Chen,Yafang Pan,Lan Wu,Bo Huang
The generation of high levels of ammonia in industries, agricultural sectors, and water treatment plants has triggered the necessity to detect high ammonia concentrations in a flexible way to ensure proactive measures for protecting humans and the environment. Therefore, it is essential to develop highly sensitive multifunctional sensors that have long-term stability, high durability, and a large stretch range. In our work, a novel approach was developed for fabricating flexible sensors consisting of polyurethane (PU) yarn and the loaded Ti 3 C 2 T x /CeO 2 /TiO 2 (abbreviated as MTCe) nanocomposites. The structures and morphology of the yarn-shaped sensors were analysed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and other characterisation methods. In addition, gas and strain responses were recorded and analysed using an AES-4SD flexible electronic device. The response of the yarn-shaped sensors to 100 ppm NH 3 was 42.9 % at room temperature (25 °C), indicating its excellent gas sensitivity. In addition, the sensors exhibited some key advantages, such as a large stretch range (60 %), high sensitivity (up to 385.285), and good durability (200 stretches/releases at 20 % stretch), which may be considered a remarkable achievement in the field of flexible sensor manufacturing for multiple applications.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Zhihua Zhao,Yao Wang,Pu Chen,Lan Wu
In the wake of rapid advancements in the realm of smart textiles, flexible ammonia sensors have garnered significant interest because of its potential implications in environmental monitoring, health diagnosis, and human-machine interaction. Despite their promise, challenges such as limited flexibility, insufficient gas detection sensitivity, and complex production processes have hindered their pragmatic deployment. This study introduces a flexible and multi-functional sensors based on PU-Supported PPy/Ti 3 C 2 T x yarns fabricated through a straightforward in-situ polymerization technique. The gas sensitivity and stretch characteristics of NH 3 gas at ambient temperature were assessed, revealing that the flexible and multi-functional sensors has exceptional sensitivity, stretch range, stability, and durability, which can be employed for detecting human physiological activity and recognising gestures. Its remarkable selectivity and strong reaction to ammonia gas also demonstrate its multi-functionality. This study presents a successful approach for integrating high-performance multifunctional flexible electronic products, with wide-ranging application potential and promising possibilities in future smart textiles and wearable devices.
研究领域:
材料科学
·
传感器技术
·
智能纺织品
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2017
·
IF 2.603
Ran Zhao,Dong Chen,Hualing Wu
To evaluate effects of Pu-erh ripened tea in hyperuricemic mice, a mouse hyperuricemia model was developed by oral administration of potassium oxonate for 7 d. Serum metabolomics, based on gas chromatography–mass spectrometry, was used to generate metabolic profiles from normal control, hyperuricemic and allopurinol-treated hyperuricemic mice, as well as hyperuricemic mice given Pu-erh ripened tea at three doses. Pu-erh ripened tea significantly lowered serum uric acid levels. Twelve potential biomarkers associated with hyperuricemia were identified. Pu-erh ripened tea and allopurinol differed in their metabolic effects in the hyperuricemic mice. Levels of glutamic acid, indolelactate, L-allothreonine, nicotinoylglycine, isoleucine, l -cysteine and glycocyamine, all involved in amino acid metabolism, were significantly changed in hyperuricemic mice treated Pu-erh ripened tea. Thus, modulating amino acid metabolism might be the primary mechanism of anti-hyperuricemia by Pu-erh ripened tea.
研究领域:
药理学
·
代谢研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Ya Liu,Wenzhu Tang,Gaowei Zhang,Wenhao Chen,Qingze Chen,Chunlin Xiao,Shenghui Xie,Yejun Qiu
Developing stable and efficient electrocatalysts for hydrogen evolution reaction is of great significance for the production of clean hydrogen energy from water splitting. In this work, 3D AgNWs@NiMo/PU electrode was obtained by electrodepositing NiMo alloy onto three-dimensional silver nanowires conductive substrate (3D AgNWs/PU) which was uniformly assembled on the surface of the skeleton of a polyurethane sponge (PU). 3D AgNWs/PU provides good electrolyte permeability, rich active site attachment points, good electronic conductivity and electrocatalytic synergy, which greatly improves the catalytic activity. In addition, 3D AgNWs@NiMo/PU electrode does not need to use adhesive in the process of hydrogen evolution, which can improve the hydrogen evolution performance and stability of the electrode. Specifically, the optimized electrode (AgNWs@NiMo/PU-1200 s) exhibits excellent hydrogen evolution performance by achieving a low overpotential of 32 mV (vs. RHE) at a current density of 10 mA cm −2 , with a Tafel slope of 72 mV dec -1 (in 1 M KOH). More interestingly, it also has good stability after 10 h of stability test. Therefore, this study provides a feasible way to develop stable and efficient 3D HER electrocatalysts.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Food & Function
·
2015
·Vol. 6
·期 6
·2008-2016
·
IF 2.791
Liang Zeng,Jingna Yan,Liyong Luo,Dongying Zhang
Disorders of blood lipid metabolism are the primary risk factors for many diseases. Recently, the effect of Pu-erh tea on blood lipid metabolism has received increasing attention. However, the mechanism underlying its ability to regulate blood lipid metabolism is unclear. We set out to study this through assessing the effects of Pu-erh tea aqueous extract (PTAE) on the central enzymes of blood lipid metabolism, including lipoprotein-associated phospholipase A2 (Lp-PLA2), lecithin: cholesterol acyltransferase (LCAT), 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGR) and pancreatic lipase (PL). We find that the Lp-PLA2, HMRG and PL activities are inhibited by PTAE in a dose-dependent manner and that the LCAT activity tends to increase with increasing PTAE concentrations. Lineweaver–Burk plot analyses reveal that PTAE acts as a competitive inhibitor for HMGR and PL and as a noncompetitive inhibitor for Lp-PLA2. Moreover, we determine that its active ingredients include catechins, gallic acid, caffeine, free amino acids, and soluble sugar. However, the effect of each ingredient and whether any of them have synergistic effects are still unknown. The results suggest that Pu-erh tea has a potent ability to regulate blood lipid metabolism and knowledge of the mechanisms provides insights into its potential therapeutic application as an alternative hypolipidemic drug.
研究领域:
营养学
·
生物化学
✓ 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）