Polymer Chemistry
·
2020
·Vol. 11
·期 37
·6066-6072
·
IF 5.342
Shuangyu Xiong,Lian Duan,Xinjian Cheng
Some new chitosan-based fluorescent hydrogels have been successfully prepared by grafting coumarin derivatives onto chitosan via a Schiff base forming reaction or acid amine condensation reaction. It is worth noting that hydrogels synthesized by the Schiff base forming reaction can be used as a good fluorescent sensor for the selective recognition, detection and adsorption of Fe2+ ions in aqueous solution. Among them, the adsorption efficiency of 1 g of a fluorescent hydrogel to Fe2+ ions can reach 63.2 mg. In addition, after being further modified, hydrogels still retain the ability to identify and adsorb Fe2+. Therefore, this probe optimizes the synthetic route to chitosan-based fluorescent sensors and expands the practical application value of fluorescent hydrogels.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zeyi Wang,Xuejie Zou,Zhiwei Yang,Jian Wang,Qian Chen,Chengjie Pei,Zhiwei Wang,Mengwei Dong,Jian Zhang,Hai Li,Xiao Huang
Wearable temperature sensors with high sensitivity and stability hold great potential for human health monitoring. However, hydrogels, which are commonly used for wearable devices, often show poor thermal and electrical conductivity and are susceptible to dehydration and freezing. Herein, we developed a frost- and dehydration-resistive temperature sensor based on Fe2+/Ti2CTx/κ-carrageenan (CA)-polyacrylamide (PAM) hydrogel. The Fe2+ ions within the hydrogel existed in two forms: as free ions and bonded ions. The free Fe2+ ions could complex with water molecules, resulting in the improved resistance to dehydration and freezing, as well as enhanced ionic conductivity in the hydrogel. On the other hand, the remaining Fe2+ ions acted as linkers to form coordination bonds with the sulfate groups of CA chains, resulting in the greatly enhanced mechanical strength of the hydrogel. In addition, the Ti2CTx nanosheet-based fillers formed a well-defined porous laminar structure, which reduced the phonon scattering and improved the phonon adsorption within the hydrogel. The Fe2+/Ti2CTx/CA-PAM hydrogel sensor exhibited excellent temperature sensing performance including a good linearity (R2 = 0.998) within a broad working range (−10 to 60 °C), high resolution (0.1 °C), and good repeatability. Furthermore, the sensor was integrated into a wireless system for continuous monitoring of body temperature, demonstrating its potential in healthcare monitoring, electronic skins, and intelligent robots.
研究领域:
材料科学
·
生物医学工程
·
电子皮肤
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yaxin Xu,Peipei Li,Xiaojun Hu,Haoyu Chen,Ying Tang,Yu Zhu,Xiaohua Zhu,Youyu Zhang,Meiling Liu,Shouzhuo Yao
Nanozymes are considered as ideal substitutes for nature enzymes; however, the enzyme activity and the relevant detection sensitivity in actual samples still need to be further improved. Here, a nanomaterial of CuO NP-POM composed of polyoxometalate (POM) decorated with copper oxide nanoparticles (CuO NPs), which possessed tetraenzyme mimetic activities including oxidase (OXD)-, peroxidase (POD)-, catalase (CAT)-, and glutathione peroxidase (GPx)-like activities was developed. The corresponding catalytic performances, mechanisms, and kinetics were systematically investigated. Based on the POD-like activity of a CuO NP-POM nanocomposite, a colorimetric sensing platform for ascorbic acid (AA) was built with the detection limit of 15 nM, depending on the fact that AA can efficiently react with the oxidation product of TMB, which was catalyzed by CuO NP-POM on the basis of the POD-like activity. A simple fluorometric sensor for Fe2+ was developed on the basis of the GPx-like activity of CuO NP-POM with the detection limit of 8.0 nM. CuO NP-POM can weaken the fluorescence of the isoindole derivative derived from GSH and o-phthalaldehyde (OPA) due to the excellent GPx-like activity, which can accelerate the catalysis of GSH into GSSG in the presence of H2O2. However, in the presence of Fe2+, the fluorescence was recovered owing to the fact that the Fenton reaction between Fe2+ and H2O2 could reduce GSSG into GSH. The proposed colorimetric and fluorometric sensors have been successfully applied in detecting AA and Fe2+ in several food and biological samples. This work not only developed a nanocomposite with enhanced multinanozyme activity but also offered rapidly detection methods for the analysis of specific targets via the special nanozyme activities.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Meice Lu,Li Zhou
Fluorescent carbon quantum dots (CQDs) can be prepared by sonochemistry with low cost and high efficiency. However, ultrasonic synthesis of CQDs with responsive fluorescence towards environmental stimuli remains a big challenge. Herein, we report a simple one-step method to fabricate versatile nitrogen-doped CQDs (NCQDs) by ultrasonic treatment of dopamine in dimethylformamide for 8 h. The obtained NCQDs simultaneously possess superior water dispersibility and stability, bright and stable fluorescence against variations of pH and ionic strength, low cytotoxicity and high photostability. Moreover, the fluorescence of NCQDs showed sensitive quenching phenomenon towards Fe 2+ ions both in water and in the interior of cancer cells. The emission intensity of NCQDs exhibited good linear relationship ( R 2 = 0.9987) with the concentration of Fe 2+ ions in the range of 0–50 μM. The limit of detection can reach as high as 38 nM. Meanwhile, the NCQDs also exhibited temperature-dependent fluorescence with favorable linear relationship ( R 2 = 0.9965) in the range of 283–358 K, and thus can server as a nanothermometer to sense temperature both in water and in cells.
研究领域:
材料科学
·
分析化学
·
纳米技术
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Juze Xie,Yangting Ou,Jiawen Yao,Tianxin Luan,Taosheng Zhang,Zhehan Li,Chufeng Sun,Jisheng Pan
The chemical mechanical polishing (CMP) of single-crystal silicon carbide (SiC) faces challenges such as low efficiency and limited service life of the polishing liquid. To address these issues, we encapsulated the Fenton reaction catalyst FeSO 4 within melaminated formaldehyde (MF) resin via in-situ polymerization to form microcapsules. During processing, when these microcapsules come into contact with the workpiece surface, they release Fe 2+ ions that participate in the reaction, generating highly oxidizing species that promote efficient interfacial chemical reactions. Compared with other catalysts like Fe 3 O 4 and Fe-C composites, FeSO 4 exists in the polishing slurry as Fe 2+ , which significantly enhances the efficiency of the Fenton reaction. This study systematically investigates the effects of various process parameters (water-oil ratio, stirring rate, core-wall ratio) on the morphology and particle size distribution of FeSO 4 microcapsules. The results demonstrate that under conditions of a water-oil ratio of 1:25, a stirring rate of 450 rpm, and a core-wall ratio of 1:2, the prepared microcapsules exhibit smooth surfaces, uniform particle sizes, and excellent dispersion properties. When the core-wall ratio decreases from 1:1 to 1:3, the permeation resistance of the microcapsules increases by approximately 1.5 times. Fourier Transform Infrared spectroscopy (FT-IR) confirms the encapsulation of FeSO 4 within MF resin. Thermogravimetric analysis (TGA) reveals the good thermal stability of the microcapsules. Friction and wear test results indicate that the wear area under FeSO 4 microcapsule conditions is 12.491 μm², representing a 30 % increase in material removal rate compared to traditional Fenton reaction catalysts.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
表面工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Hualing He,Qing Jiang,Yuhang Wan,Md Hasib Mia,Xueru Qu,Mi Zhou,Xingyu He,Xiaoqian Li,Min Hong,Zhicai Yu,Siqi Huo
Biopolymer-based temperature-sensing fibers are increasingly employed to realize the eco-friendly concept of wearable electronics. However, keeping their long-term development remains challenging due to limited mechanical robustness and poor environmental tolerance. Herein, a bionic autonomous self-healing thermoelectric (TE) aerogel fiber with visual damage warning function (STDF) inspired by biological skin was prepared via a coaxial wet spinning strategy, which yielded a core-shell heterogeneous structure with a protective sheath with an intrinsic self-healing ability and a temperature-sensing core layer. The core layer of STDF, composed of flexible thermoplastic polyurethane embedded with rigid Ti 3 C 2 T x MXene, effectively minimizes disruptions in continuous conductive pathways during repeated extreme bending. Featuring a synergistic network of reversible hydrogen bonds and dynamic Schiff-base linkages constructed among oxidized alginate, sericin, and tannic acid, the fractured STDF aerogel fiber exhibits exceptional water-responsive self-healing efficiency (97.51% stress recovery). Moreover, the visual damage location in STDF fiber is enabled through a coloration reaction at the damaged interface between the Fe 2+ ions and 1,10-phenanthroline incorporated into the core and sheath layers, respectively. Furthermore, the resultant STDF demonstrates a wide-range temperature-sensing performance at 100–500°C and an ultrasensitive alarm response time (within 2 s) when encountering fires. This work sheds new light on the design of bionic temperature sensing fibers with environment-adaptive self-healing and damage warning abilities for improved reliability and durability in real-world wearable application scenarios.
研究领域:
材料科学
·
纳米技术
·
可穿戴电子器件
·
热电材料
·
自修复材料
·
柔性传感器
·
生物聚合物
·
智能纺织品
·
柔性机器人
·
先进制造技术
✓ 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）