MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Yue-Jie Bai,Li-Ying Liu,Xun-Kai Duan,Guang-Xuan Zhang,Chao Wang,Xin-Yu Zhou,Changhao Wang,Bing-Rong Wang,Xiao-Lin Wei,Ru-zhi Wang
To further develop sensing materials for NO 2 gas detection practical application, the operating temperature of the sensor should be significantly reduced. In this paper, In 2 O 3 flowers were prepared by the microwave-assisted hydrothermal method . Then, In 2 O 3 was doped using TAA (thioacetamide). The prepared S-doped In 2 O 3 flowers have good gas sensitivity and significantly reduced operating temperature. When exposed to 10 ppm NO 2 gas, the corresponding response was 250 at 118 °C. It can be demonstrated by the first principle calculations, in which the doping of S atoms changes the electron structure of In 2 O 3 from semiconductor to metal with a lower potential barrier. Then, significantly affects the electron crossing the intergranular potential barriers. Therefore, the operating temperature of the sensor can be reduced. Our research results will provide new research ideas and technical approaches for designing, fabricating, and applying a new generation of In 2 O 3 gas sensors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Yongsheng Chen,Erpei Wang,Zihao Wei,Yanfang Zheng,Rian Yan,Xiang Ma
Herb plant organs are aboundant in phytochemicals and possess multiple bioactivities. Investigation in the phytochemicals of herb plants organs and associated functionalities essential to explore the potential and deepened the understanding of herb plants. In this study, phytochemicals, antioxidant activity, and α-glucosidase inhibitory activity of leaf, flower, peel, root and seed herb plant organ extracts were investigated. A combination of colorimetric assays and high performance liquid chromatography were applied, and the cellular antioxidant activity was evaluated in the HepG2 model. Results show that leaf and flower organs had the highest total phenolics, flavonoids, flavonols and proanthocyanidins contents. Flower organ possessed the highest 2,2-diphenyl-1-picrylhydrazyl, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) radical scavenging activity, cellular antioxidant activity and α-glucosidase inhibitory activity. Leaf organ had the strongest oxygen radical absorbance capacity and glucose consumption. Ferulic acid, salicylic acid, chlorogenic acid and epigallocatechin gallate were the common phytochemical compounds in plant organs. Phytochemical contents showed significant positive correlations ( p < 0.05) with antioxidant and hypoglycemic effects. Results revealed that compared with other plant organs in this study, flower organ possessed excellent antioxidant and glucose regulating activities and could provide basis for the development of related health food and products for the diabetes patients.
研究领域:
植物学
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药理学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Hongyuan Shang,Hui Xu,Qingyun Liu,Yukou Du
Hydrogen sulfide (H 2 S) could be directly produced in mammals and recognized as a third gasotransmitter, which are closely associated with physiological and pathological processes. However, the detailed mechanism remains unclear, mainly due to a lack of robust sensors to accurately and quantitatively detect its concentrations in biological samples. Herein, for the first time, we develop a new electrochemical sensor for the detection of H 2 S based on the chemical reaction between copper oxide (CuO and Cu 2 O) and hydrogen sulfide (including H 2 S and HS − ) at a neutral solution (pH 7.4). Interestingly, when Na 2 S exists, copper and its oxide can be converted into Cu 2 S and CuS, resulting in an increase in the oxidation peak current of Cu 2 S-CuS with the increase of Na 2 S concentration, which is a direct evidence confirming the excellent sensor for the H 2 S detection. More importantly, the linear relationship between the oxidation peak currents of Cu 2 S-CuS and Na 2 S concentration is observed from 0.4 μM to 400 μM with a low detection limit of 0.2 μM, and satisfying selectivity. The developed strategy may have a great potential for further understanding the roles that biological H 2 S plays in biological systems.
研究领域:
生物医学工程
·
分析化学
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产品关联
DOI
高影响因子
Frontiers in Immunology
·
2023
·
IF 7.3
Zhou Huiji,Zhou Luxian,Li Bo,Yue Rongcai
Introduction: Dendrobium officinale Kimura et Migo (D. officinale) , widely called as “life-saving immortal grass” by Chinese folk, is a scarce and endangered species. The edible stems of D. officinale have been extensively studied for active chemical components and various bioactivities. However, few studies have reported the well-being beneficial effects of D. officinale flowers (DOF). Therefore, the present study aimed to investigate the in vitro biological potency of its aqueous extract and screen its active components.Methods: Antioxidant tests, including 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), the ferric reducing ability of plasma (FRAP), and intracellular reactive oxygen species (ROS) level analyses in primary human epidermal keratinocytes, anti-cyclooxygenase2 (COX-2) assay, anti-glycation assay (both fluorescent AGEs formation in a BSA fructose/glucose system and glycation cell assay), and anti-aging assay (quantification of collagen types I and III, and SA-β-gal staining assay) were conducted to determine the potential biological effects of DOF extracts and its major compounds. Ultra-performance liquid chromatography-electrospray ionisation-quadrupole-time-of-flight-mass spectrometry (UPLC-ESI-QTOF-MS/MS) was performed to investigate the composition of DOF extracts. Online antioxidant post-column bioassay tests were applied to rapidly screen major antioxidants in DOF extracts.Results and discussion: The aqueous extract of D. officinale flowers was found to have potential antioxidant capacity, anti-cyclooxygenase2 (COX-2) effect, anti-glycation potency, and anti-aging effects. A total of 34 compounds were identified using UPLC-ESI-QTOF-MS/MS. Online ABTS radical analysis demonstrated that 1-O-caffeoyl-β-D-glucoside, vicenin-2, luteolin-6-C-β-D-xyloside-8-C-β--D-glucoside, quercetin-3-O-sophoroside, rutin, isoquercitrin, and quercetin 3-O-(6″-O-malonyl)-β-D-glucoside are the major potential antioxidants. In addition, all selected 16 compounds exerted significant ABTS radical scavenging ability and effective AGE suppressive activities. However, only certain compounds, such as rutin and isoquercitrin, displayed selective and significant antioxidant abilities, as shown by DPPH and FRAP, as well as potent COX-2 inhibitory capacity, whereas the remaining compounds displayed relatively weak or no effects. This indicates that specific components contributed to different functionalities. Our findings justified that DOF and its active compound targeted related enzymes and highlighted their potential application in anti-aging.
研究领域:
药理学
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生物化学
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植物科学
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化妆品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Xuezhen Feng,Chao Wang,Shibin Shang,He Liu,Xujuan Huang,Jianxin Jiang,Haibo Zhang
The development of stimulus-responsive materials with multifunctionality is important for achieving bionic artificial intelligence. However, stimulus-responsive cellulose hydrogels that simultaneously change their shape and fluorescent color under a single stimulus are difficult to fabricate. Here smart, multicolor fluorescent cellulose hydrogels were prepared from cellulose, levofloxacin, epichlorohydrin, and lanthanide ions (Eu 3+ or Tb 3+ ). The hydrogels were incorporated with pan paper into synergetic color-changing and shape-morphing actuators (Eu-CLF and Tb-CLF actuators). Besides fluorescing with the metal ligands, levofloxacin possesses antibacterial activity. The fluorescence color of Eu-CLF hydrogel in Tb 3+ solution changed from red to yellow, whereas that of Tb-CLF hydrogel in Eu 3+ solution changed from green to red. Both the Eu-CLF and Tb-CLF hydrogels fluoresced blue and green in alkali and acid solution, respectively. The actuator thus achieves synergetic color-changing and shape-morphing under a single external stimulus (acidic/alkaline switching). Such an activator shaped like a bionic flower and an intelligent octopus-type soft robot with camouflaging ability were then prepared. This study provides an elegant strategy for developing advanced multi-responsive multicolor tunable behaviors for bionic soft robots, biosensors , and camouflaged robots.
研究领域:
材料科学
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仿生学
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人工智能
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机器人技术
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生物传感器
✓ 已验证
DOI
高影响因子
Small
·
2023
·
IF 13.3
Ran Bi,Xiaohong Li,Xingcheng Ou,Jiaqi Huang,Dantong Huang,Guoliang Chen,Yu Sheng,Wei Hong,Yan Wang,Weijie Hu,Shuang-Zhuang Guo
Resolution control and expansibility have always been challenges to the fabrication of structural color materials. Here, a facile strategy to print cholesteric liquid crystal elastomers (CLCEs) into complex structural color patterns with variable resolution and enhanced expansibility is reported. A volatile solvent is introduced into the synthesized CLC oligomers, modifying its rheological properties and allowing direct-ink-writing (DIW) under mild conditions. The combination of printing shear flow and anisotropic deswelling of ink drives the CLC molecules into an ordered cholesteric arrangement. The authors meticulously investigate the influence of printing parameters to achieve resolution control over a wide range, allowing for the printing of multi-sized 1D or 2D patterns with constant quality. Furthermore, such solvent-cast direct-ink-writing (DIW) strategy is highly expandable and can be integrated easily into the DIW of bionic robots. Multi-responsive bionic butterfly and flower are printed with biomimetic in both locomotion and coloration. Such designs dramatically reduced the processing difficulty of precise full-color printing and expanded the capability of structural color materials to collaborate with other systems.
研究领域:
材料科学
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纳米技术
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生物医学工程
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机器人学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
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2022
·
IF 11.307
Jingwen He,Ze Wu,Bingjue Li,Youqiang Xing,Peng Huang,Lei Liu
Untethered intelligent soft robots capable of autonomous, continuous, directional, and fast movements under external stimuli have great potential in environmental, industrial, military, and medical fields. This paper used an unconventional dual-flow filtration method to prepare a laterally heterogeneous MXene-NiFe 2 O 4 /Polycarbonate bilayer membrane. Based on this, a one-piece untethered soft crawling robot with multi-stimulus synergistic control is developed, which can achieve relatively fast crawling up to 3.77 mm/s and directional turning locomotion. In addition, a cross-shaped robot that can realize biaxial flipping locomotion is developed by using the inverse snapping property of the polycarbonate films under light and humidity excitation. The preparation method has also been extended to unconventional multi-flow filtration and applied to bionic flowers and asymmetric grippers with biological gradients. This work provides an effective way for designing soft crawling robots with fast actuation performance and adjustable trajectories that can be used in areas such as bionic soft robots and biomedical systems.
研究领域:
机器人学
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材料科学
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生物医学工程
·
软体机器人
✓ 已验证
产品关联
DOI
高影响因子
Science Robotics
·
2021
·Vol. 6
·期 53
·
IF 23.956
Shuo Zhang,Xingxing Ke,Qin Jiang,Han Ding,Zhigang Wu
Tunable, soft, and multifunctional robots are contributing to developments in medical and rehabilitative robotics, human-machine interaction, and intelligent home technology. A key aspect of soft robot fabrication is the ability to use flexible and efficient schemes to enable the seamless and simultaneous integration of configurable structures. Here, we report a strategy for programming design features and functions in elastomeric surfaces. We selectively modified these elastomeric surfaces via laser scanning and then penetrated them with an active particle–infused solvent to enable controllable deformation, folding, and functionality integration. The functionality of the elastomers can be erased by a solvent retreatment and reprocessed by repeating the active particle infusion process. We established a platform technique for fabricating programmable and reprocessable elastomeric sheets by varying detailed morphology patterns and active particles. We used this technique to produce functional soft ferromagnetic origami robots with seamlessly integrated structures and various active functions, such as robots that mimic flowers with petals bent at different angles and with different curvatures, low-friction swimming robots, multimode locomotion carriers with gradient-stiffness claws for protecting and delivering objects, and frog-like robots with adaptive switchable coloration that responds to external thermal and optical stimuli.
研究领域:
软体机器人
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材料科学
·
机械工程
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生物医学工程
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人机交互
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智能家庭技术
✓ 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）