MATERIALS LETTERS
·
2022
·
IF 3.574
Zhenzhan Yan,Li Yang,Jimin Han,Wenchao Tong
In this work, we chose graphene oxide , lead acetate, and polyvinyl alcohol as precursor materials, and prepared spherical carbon-based lead azide composites in which nano-level lead azide was uniformly distributed in the graphene sheet layer. Detailed characterization shows that due to the excellent thermal and electrical conductivity of the graphene sheet, the electrostatic sensitivity of LA/C/GA (lead azide/carbon/graphene) is reduced from 0.11 J to 1.84 J, and the flame sensitivity is increased from 8 cm to 43 cm. The performance of LA/C/GA is better than previously reported pure LA (lead azide) and most modified LA materials.
研究领域:
材料科学
·
爆炸物化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shuang Wang,Li Yang,Wenchao Tong,Qian Yu,Jiexin He,Long Li
The main bottlenecks limiting the practical application of primary explosives are the contradiction between safety and detonation performance, as well as the inherent brittleness of powder charge. Traditional methods to improve sensitivity performance such as adding carbon nanomaterials or embedding metal–organic framework (MOF) structure methods are mostly powders, which are inherently brittle and unsafe. Here, we report three types of typical azide aerogels that can be directly prepared and obtained in this paper by combining electrospinning with aerogel. Their electrostatic sensitivity and flame sensitivity were significantly improved and could be detonated successfully at an initiation voltage of 25 V, demonstrating good ignition performance. This enhancement is primarily due to the porous carbon skeleton structure evolved from a three-dimensional nanofiber aerogel, which has good thermal and electrical conductivity characteristics and can also uniformly load azide particles, contributing to improved explosive system sensitivity. The most important aspect of this method is that it can directly prepare molded explosives, which can be matched with the micro-electrical-mechanical system (MEMS) process, and it offers a new idea for the preparation of high-security molded explosives.
研究领域:
材料科学
·
爆炸化学
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产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2025
·
IF 9.7
Yang Lu,Miao Zhouyu,Dong Yanjuan,Yu Hou-Yong
Bionic electronic skin (e-skin) with intrinsic compressibility and stretchability holds significant potential in robotic haptics, enabling robots to perceive and interact with objects of various shapes effectively. However, creating a biomimetic e-skin with precise dual-signal decoupling remains a challenge. To address this, we present a bifunctional sensor inspired by the spider-hunting mechanism, which captures signals during predation. This sensor is constructed using pressure-stretched multilayer electrospinning of nanofibers-polyvinyl alcohol (CNC-PVA), followed by gas-phase polypyrrole (PPy) polymerization. The innovative superimposed design of the homologous multilayer sensing module, combined with a conductive nanofiber network structure, enables remarkable multi-signal self-decoupling capabilities. Key features of this sensor include high-pressure sensitivity (14.8 kPa −1 for 0–21 kPa) and an impressively fast response time of 57 ms. As a pressure sensor, it demonstrates repeatability over 5 cycles, while as a stretching sensor, it achieves high sensitivity (gauge factor, GF=1.22) and remains stable over 1000 cycles. Furthermore, this self-decoupled sensing system can independently detect dual signals (shape and weight of objects), thereby empowering robots to recognize and handle various objects more effectively. This multifunctional, low-cost sensor offers an advanced solution to overcome problems in functional e-skin for enhanced robotic object manipulation and recognition capabilities.
研究领域:
材料科学
·
仿生学
·
机器人技术
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 33
·期 1
·235-245
·
IF 3.665
Zhihui Pan,Yingru Huang,Haoyong Guo,Tingjian Huang,Gang Wen,Huarong Yu,Junguo He
An advanced dual pH- and temperature-sensitive hydrogel (NASH2.5) was optimally synthesized through modification of N-isopropylacrylamide (NIPAM) hydrogel with introducing 5 mol% acrylic acid (AA) and 2.5 wt% sewage sludge ash (SSA). The swelling kinetic results showed that NASH2.5 exhibited both high equilibrium swelling ratio and swelling rate, which was attributed to the higher porous structure as shown in scanning electron microscope, and the more hydrogen bonding formed inside of the hydrogel as investigated in Fourier transform infrared spectrometer. In addition, its curve was better fitted to the pseudo-second-order model, indicating that the water absorption process was dominated by chemisorption through forming the hydrogen bonding among the water molecules and carboxyl/silanol groups of the hydrogel. Compared with the pure NIPAM hydrogel, the water transport mechanism switched from Case I diffusion to Case II diffusion by introduction of AA and further SSA. Furthermore, through the results of the deswelling kinetics in pH value change (from 9 to 4 and 2, respectively), temperature value change (from 25 to 40, 50, and 60°C, respectively), and dual pH and temperature values changes, NASH2.5 not only presented a high pH sensitivity, but also showed high sensitive to temperature by achieving high water recovery ratio in rapid dehydrated rate. Therefore, the dual stimuli-sensitive hydrogel with the simultaneously high performance of swelling and deswelling would provide a suitable alternative for specific applications such as pollutant adsorption.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
OPTICAL FIBER TECHNOLOGY
·
2023
·
IF 2.7
Yaxun Zhang,Jinjian Yu,Piliang Liu,Chen Liu,Xiaoyun Tang,Zhihai Liu,Yu Zhang,Libo Yuan
The ability to monitor temperature and humidity simultaneously is critical for biomedical and industrial production. We demonstrate a novel temperature and humidity optical fiber sensor based on a photopolymer and polydimethylsiloxane for dealing with temperature cross-sensitivity problem. The low-frequency signal and the high-frequency signal in the interference spectrum were obtained by filtering. Due to structural and material properties, the low-frequency signal is only temperature dependent, while the high-frequency signal is affected by temperature and humidity. Temperature and humidity signals rely on different interferometric mechanisms for measurement to achieve negligible crosstalk . The sensor exhibits a high temperature sensitivity of 1.88 nm/°C by measuring the shift of an interference dip wavelength in the low-frequency signal. The humidity sensitivity is up to 0.282 nm/%RH due to the excellent water absorption capacity of the photopolymer. High accuracy, good repeatability, and stability enable the sensor to measure ambient temperature and humidity. We believe the sensor has excellent potential in environmental monitoring, biomedicine, and human–machine interface.
研究领域:
光学工程
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生物医学工程
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环境监测
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 106
·87512-87520
·
IF 3.84
Ruiqing Liu,Shuang Liang,Cun Jiang,Xin Wang,Ying Gong,Penghui Li,Zushun Xu,Haibo Xu,Paul K. Chu
Smart polymer-based theranostic agents often have the problem of a low drug release rate and it is difficult for them to reach the site of brain tumors for magnetic resonance imaging (MRI). To synthesize a theranostic agent for brain tumor MRI with a high drug release rate, paramagnetic, pH and temperature-sensitive polymeric particles (PPPs) are synthesized using a simplified processes in this work. These dually sensitive polymeric particles show negligible cytotoxicity against HeLa and glioma (C6) cells. The obtained polymeric particles can effectively be loaded with the anticancer drug doxorubicin (DOX). In vitro drug release measurements exhibit retarded release profiles when subjected to varying pH or temperature. Moreover, DOX-loaded PPPs exhibit obvious antitumor properties for C6 cells. The percentage of cumulative DOX release is higher than 95% when both pH and temperature are changed. The T1-weighted relaxivity values at 3 T are 12.41 mM−1 s−1 (pH = 6.3) and 10.75 mM−1 s−1 (pH = 7.4). In vivo MRI reveals that the PPPs can be effectively imaged in brain tumors (gliomas). These results indicate that the PPPs have great potential in diagnosing and treating glioma.
研究领域:
生物医学工程
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肿瘤学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xincheng Ding,Weibing Zhong,Haiqing Jiang,Mufang Li,Yuanli Chen,Ying Lu,Jun Ma,Ashish Yadav,Liyan Yang,Dong Wang
Wearable piezoresistive sensors have attracted wide attention for application in human activities monitoring, smart robots, medical detection, etc. However, most of the sensing signals collected from the piezoresistive sensor are triggered by coupling forces, such as the combination of tension and pressure. Thus, the piezoresistive sensor would be incapable of accurately monitoring and evaluating specific human motion due to the mutual interference from tension and pressure, as the tension is difficult to be decoupled or eliminated from the coupling forces. Herein a prestretchable conductive yarn (PCY) sensor with pressure sensitivity but tension insensitivity was introduced to remove the disturbance from tension. The PCY-based piezoresistive sensor is tension insensitive (gauge factor of 0.11) but pressure sensitive (sensitivity of 187.33 MPa–1). The fabric-based pressure sensor assembled with cross-arranged PCY weft and warp revealed magnified pressure sensitivity compared with the single PCY yarn sensor, as well as tension insensitivity to strain and tensile angle. Moreover, it possessed benign cyclicity during 5000 cycles of pressing/releasing. Therefore, the fabric piezoresistive sensor based on weaved conductive yarns is suitable for highly accurate and large area pressure detection, such as monitoring massage intensity of acupuncture points.
研究领域:
材料科学
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生物医学工程
·
电子工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Yanfei Zhu,Junhong Ling,Xinyi Xu,Xiao-kun Ouyang,Nan Wang
The high expression of reduced glutathione (GSH) and low pH in tumor sites have encouraged new ideas for targeted drug release. The tumor microenvironment is a crucial target for studying the anti-tumor efficiency of photothermal therapy because the microenvironment plays a key role in cancer progression, local resistance, immune escaping, and metastasis. Herein, active mesoporous polydopamine nanoparticles loaded with doxorubicin and functionalized with N,N′ -bis(acryloyl)cystamine (BAC) and cross-linked carboxymethyl chitosan (CMC) were used to induce simultaneous redox- and pH-sensitive activity to achieve photothermal enhanced synergistic chemotherapy. The inherent disulfide bonds of BAC were able to deplete glutathione, thus increasing the oxidative stress in tumor cells and enhancing the release of doxorubicin. Additionally, the imine bonds between CMC and BAC were stimulated and decomposed in the acidic tumor microenvironment, improving the efficiency of light conversion through exposure to polydopamine. Moreover, in vitro and in vivo investigations demonstrated that this nanocomposite exhibited improved selective doxorubicin release in conditions mimicking the tumor microenvironment and low toxicity towards non-cancerous tissues, suggesting there is high potential for the clinical translation of this synergistic chemo-photothermal therapeutic agent.
研究领域:
生物医学工程
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肿瘤学
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纳米医学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yaqi Zhang,Hongliang Wei,Bingya Hua,Chunwang Hu,Wenjing Zhang
Chitosan based hydrogels with multiple stimulus responses have broad application prospects in many fields. Considering the advantages of semi interpenetrating network (IPN) technology and the special temperature and ion responsiveness of polymers containing zwitterionic groups, a semi-IPN hydrogel was prepared through in situ free radical polymerization of N , N -dimethyl acrylamide and [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl) ammonium hydroxide with polyethylene glycol dimethacrylate as a crosslinker and carboxymethyl chitosan as filler. The gel mass fraction and swelling ratio were measured, and the preparation conditions were optimized. The result indicated that the hydrogel possessed a unique thermo-/pH−/ ion-sensitive behavior. The swelling ratio increased with the increase of temperature and ion concentration, and showed a decreasing trend with the increase in pH. In addition, the hydrogel was stable when the stimuli changed. Adsorption behavior of the hydrogel to Eosin Y (EY) was systematically investigated. The adsorption process can be described well by the pseudo-second-order kinetic model and Langmuir isotherm model, indicating that it was a chemical adsorption. The experiments indicated that the hydrogel exhibited good antifouling and reusability features. Therefore, the semi-IPN hydrogel with antifouling properties and thermo-/pH−/ion-sensitivity can be easily manufactured is expected to find applications in water treatment fields.
研究领域:
材料科学
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环境科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2013
·Vol. 70
·期 10
·2675-2689
·
IF 1.332
Cao Zhi-Feng,Jin Yong,Miao Qing,Ma Chun-Yan,Zhang Biao
Novel of temperature and pH sensitive hydrogels composed of polyampholyte (casein) and poly( N -isopropylacrylamide) were successfully synthesized via free radical polymerization. The swelling behavior of the obtained hydrogel was investigated and it was found that the synthesized hydrogel has a sensitivity to temperature, pH, and the crosslinker content. The drug release of this hydrogel was determined with salicylic acid employed as the model drug. It found that the release of salicylic acid from the hydrogel particles was affected by temperature, pH, and the crosslinker content in the copolymer hydrogels. Therefore, the novel pH and temperature sensitive hydrogel seem to be of great promise in pH and temperature sensitive oral drug release systems.
研究领域:
材料科学
·
药学
·
生物医学工程
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 3
·917-928
·
IF 2.573
Zijun Liu,Hongliang Wei,Yuhua Liu,Weikun Li,Songmao Li,Gang Wang,Tao Guo
Herein, interpenetrating network (IPN) hydrogels were successfully prepared for the first time through integrating two cross-linking reactions in water in one pot, including amine-anhydride reaction and subsequent photopolymerization. First, the polymer containing anhydride groups was prepared via free radical copolymerization of maleic anhydride and acrylamide. Second, the as-prepared polymer was dissolved in water with polyacrylamine hydrochloride, N -isopropylacrylamide, polyethylene glycol dimethacrylate, 2-acrylamido-2-methylpropanesulfonic acid, and photoinitiator to obtain a homogeneous transparent solution. Third, the mixed solution was put in water bath of 50°C for 1 h to obtain the first network via the amine-anhydride click reaction. Afterward, the second network was formed by photopolymerization. Finally, the swelling and drug release behavior of the hydrogels were studied with isoniazid as a model drug. The results show the IPN hydrogel possesses pH and temperature sensitivity and their controlled-release behavior can be tuned via adjusting pH and temperature. In view of the advantages of amine-anhydride reaction and photopolymerization, the strategy described here is of significance for the preparation of IPN hydrogel.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junru Wang,Dan Liu,Jianhu Zhang,Feiyan Gong,Xu Zhao,Zhijian Yang
Safety performance under external stimuli plays a crucial role for energetic materials. Therefore, desensitization of high explosive arouses widespread research interests in the field of energetic materials. Nevertheless, synergistically reducing impact and electrostatic spark sensitivities of 1,3,5,7-tetranittro-1,3,5,7-tetrazocane (HMX) remains challenging. Herein, a novel strategy concerning conductive polymer coating was proposed to solve this issue. Theoretically, the polypyrrole (PPy) can form a complete shell and strong interaction with HMX crystals. The HMX@PPy composite has been successfully achieved by in-situ polymerization, exhibiting superior sensitivities (impact: from 7 J to 27.5 J and electrostatic spark: from 0.4 J to 1.68 J) among reported HMX-based energetic materials. In addition, the thermal phase stability of HMX can also be visibly improved with sluggish phase-transition kinetics by introducing PPy coating. The current study provides a design concept for high energy explosives with low sensitivity and improved comprehensive performances.
研究领域:
爆炸物科学
·
材料科学
✓ 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）