SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Hongran Zhao,Tong Zhang,Rongrong Qi,Jianxun Dai,Sen Liu,Teng Fei,Geyu Lu
Mesoporous silicas loading hydrophilic materials composites were widely used in humidity sensors during the last decade. However, the physical mixing process used for loading the hydrophilic materials in the channel of mesoporous silicas is hard to guarantee their uniform dispersion, and there is no strong force to bind the host and guest materials together. To solve above problems, novel vinyl functionalized mesoporous silicas (SBA-15-vinyl) were chemically modified with hydrophilic sodium p -styrenesulfonate (SSS) with free radical polymerization . The chemical and porous structures of the obtained hybrid materials (SBA-15-PSSx) were characterized by fourier transform infrared spectroscopy (FT-IR), elemental analyses (EA), X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and N 2 adsorption-desorption. The humidity sensing properties of the sensors based on SBA-15-vinyl and SBA-15-PSS indicate the introduction of PSS could effectively enhance the sensing properties of SBA-15-vinyl. The impedance of the optimized sensor changed by more than three orders of magnitude over the relative humidity (RH) range of 11%–95%, with rapid response to RH change.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCES AND NUTRITION
·
2019
·
IF 2.792
Yuanfeng Wu,Yuke Shen,Ye Zhu,Jothame Mupunga,Ligen Zou,Chao Liu,Shiwang Liu,Jianwei Mao
After consuming broccoli, isothiocyanates can be produced by the hydrolytic action of myrosinase from plant and/or microbiota. Using male C57BL/6 mice, the present study investigated the effects of broccoli ingestion on the myrosinase-like activity, NAD(P)H:quinone oxidoreductase 1 (NQO1) activity, diversity and composition of the gut microbiota. Compared with the control group, continuously feeding raw or hydrolysed broccoli increased the myrosinase-like activities of the colon and caecum contents, and also improved the NQO1 activity of the colon mucosa. Significant difference between the broccoli and control feeding groups were found. 16S rRNA gene sequencing indicated that broccoli ingestion profoundly affected the composition of the gut bacteria community. The correlation between the gut bacterial community composition and microbiota myrosinase-like activity was also studied. However, one type of glucosinolate, sinigrin, had no effect on these activities, indicating that broccoli component(s), other than glucosinolate, had increased the NQO1 and myrosinase-like activities.
研究领域:
营养学
·
微生物学
·
分子生物学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 5
·1266-1281
·
IF 2.7
Zhou F. Y.,Xu J. C.,Hong B.,Peng X. L.,Zeng Y. X.,Li J.,Ge H. L.,Wang X. Q.
Mesoporous SnO 2 nanospheres are synthesized by template-free solvothermal method, and then reduced graphene oxide (rGO) nanosheets are anchored on SnO 2 nanospheres (SnO 2 @rGO nanocomposites) by hydrothermal method. The gas-sensing results indicate that rGO nanosheets greatly affect the formaldehyde (HCHO) gas-sensing properties, which the response to 100 ppm HCHO gas increases with the rGO content and reach the maximum of 113.56 at 190 °C for SnO 2 @0.5%rGO sensor. Owing to the huge surface area and conductivity, rGO nanosheets absorb more oxygen molecules and extract electrons from SnO 2 nanospheres, leading to the thicker electron depletion layer of SnO 2 nanospheres. Furthermore, p-n heterojunctions at the interface of rGO nanosheets and SnO 2 nanospheres further increase the thickness of electron depletion layer. However, SnO 2 @0.8%rGO sensor presents the lower response for the new conductive pathways between the surface rGO nanosheets due to the excess of rGO content.
Graphical abstract
研究领域:
材料科学
·
传感器技术
·
纳米科技
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2013
·Vol. 292
·期 3
·653-660
·
IF 2.161
Luo Jing,Zhou Qun,Sun Jun,Liu Ren,Liu Xiaoya
Well-defined water-dispersible polyaniline (PANI) nanoparticles were synthesized by in situ chemical oxidative polymerization of aniline in the presence of an amphiphilic P(AMPS- co -VM) copolymer micelle. P(AMPS- co -VM) copolymer was prepared by the free radical polymerization of 7-(4-vinylbenzyloxyl)-4-methyl-coumarin (VM) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) which can self-assemble into micelles in aqueous solution. Here, P(AMPS- co -VM) copolymer micelle is used not only as soft template but also as acid dopant in our reaction system. The structure, size, and morphology of PANI nanoparticles were characterized by various experimental techniques. It is found that the morphology and the size of the PANI nanoparticles strongly depend on the molecular characteristics of the P(AMPS- co -VM) copolymer. The synthesized PANI nanoparticles behaved as particulate emulsifier for the stabilization of oil-in-water emulsions.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
LIFE SCIENCES
·
2019
·
IF 3.448
Zhaopeng Yan,Bin Zang,Xiaoying Gong,Jiangyue Ren,Rui Wang
Aims Acute pancreatitis (AP) is usually complicated with multiple organ insufficiency, including renal injury. Hyperlipidemia is regarded as a risk factor to induce AP. High-fat diet-induced hyperlipidemic pancreatitis (HP) increased nowadays and showed more severe symptoms and complications than other AP. However, detailed mechanisms or mediators involved in HP complicated with acute renal injury were less studied. Here, we aimed to study how miR-214 expresses in the HP and whether miR-214 has functions to regulate pathological kidney damages induced by HP. Main methods Sprague-Dawley rats were adopted to establish HP model complicated with acute renal injury through long-term high-fat diet and sodium taurocholic injection. Models were injected with LV-rno-miR-214-3p or LV-anti-rno-miR-214-3p to exogenously regulate miR-214-3p to study its impacts on HP via a series of molecular and histological experiments. Key findings MiR-214-3p was found to be up-regulated in the kidney, pancreas and serum of HP rats and also could intensify the pathological alterations, kidney and pancreas damages and fibrosis induced by HP. Inflammatory response in HP was enhanced when miR-214-3p was overexpressed. Besides, miR-214-3p up-regulation was showed to inhibit PTEN expression but increased P-Akt levels in the HP kidney, which might be a possible mechanism to induce severe symptoms of pancreatitis. Knockdown of miR-214-3p showed opposite effects. Significance MiR-214-3p is indicated to exacerbate the tissue damages and inflammatory response caused by HP complicated with acute renal injury, which may provide a novel therapeutic perspective targeting miR-214-3p to treat HP with acute renal injury.
研究领域:
分子生物学
·
病理学
·
药理学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Yong Wang,Chengxin Zeng,Liting Wu,Yalin Dong,Yu Zhang,Dingyi Yang,Wen Hu,Jian Hao,Hongzhe Pan,Rusen Yang
Two-dimensional (2D) carbon nitride sheets (CNs) with nanoscale thickness have great potential in solar energy conversion owing to their intrinsic bandgap. However, their photocatalytic efficiency falls far below the practical requirements because the generated electron-hole pairs rapidly recombine. We construct a metal-free 2D p–n junction heterophotocatalyst from CNs and violet phosphorene (VP) using a simple electrostatic self-assembly method. The experimental results and density functional theory calculations show that the built-in electric field of the p–n junction promotes photogenerated carrier transport at the heterojunction interface, thereby promoting the separation of photogenerated electron-hole pairs. Under visible-light illumination, the visible-light photocatalytic hydrogen and CO production rates of the CNs/VP heterojunction were increased by 5.85 and 1.51 times, respectively, when compared to that of CNs . This study provides new insights into the design of metal-free heterogeneous photocatalysts with high catalytic activity.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xiaomin Tang,Ting Huang,Shixin Zhang,Wei Wang,Huaili Zheng
Hematite wastewater containing dissolved heavy metals is a potential threat to eco-environment and human health. Flocculation as an efficient and cost effective water treatment technology should be applied in its treatment. A sulfonated chitosan-based flocculant (CS-g-P(AM-AMPS)) was prepared via graft copolymerization. Two synthesis pathways and reaction products with different molecular structure were discovered in processes. CS-g-P(AM-AMPS) possessed the multifarious functional groups that contributed to its excellent performance in hematite wastewater treatment. Bridging, adsorption and entrapment in coagulation-flocculation were enhanced due to CS-g-P(AM-AMPS), and the impressive floc size and high removal efficiency were represented in the treatment as well. Dissolved heavy metals in the wastewater were removed by the chelation of sulfonate group in CS-g-P(AM-AMPS), the adsorption of other functional groups and the co-settlement with flocs. CS-g-P(AM-AMPS) will have the potential application in industrial wastewater treatment for its high flocculation performance, thermal stability and solubility.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Xiaojian Shi,Wenzhi Yang,Shi Qiu,Jinjun Hou,Wanying Wu,Dean Guo
Lipidomics currently is still confronted with challenges from chromatographic separation and lipids identification. Here we report a lipidomics platform by integrating ultrahigh performance supercritical fluid chromatography/quadrupole time-of-flight mass spectrometry (UHPSFC/QTOF-MS) and collision cross section (CCS) measurement using ion mobility spectroscopy/time-of-flight mass spectrometry (IMS/QTOF-MS), aiming to enhance the profiling performance and identification reliability of lipids. The lipidomes extracted from three congeneric Panax species ( P. ginseng , P. quinquefolius , and P. notoginseng ) by methyl tert -butyl ether are comprehensively profiled and compared by use of this platform. A potent UHPSFC/QTOF-MS approach was developed on a 1.7-μm particles packed Torus 2-PIC column using CH 3 OH (in CO 2 ) as a modifier and CH 3 OH/0.2 mM ammonium acetate as the makeup liquid, enabling well resolution of six lipid subclasses by both positive and negative MS E modes. In contrast to the reversed-phase chromatography, “normal-phase” like elution order and better resolution of polar lipids and some lipid isomers were achieved by UHPSFC separation. Pattern recognition chemometric analysis of 60 batches of Ginseng samples ultimately unveiled 24 lipid markers, of which triacylglycerols were the most important. Aside from the automated MS database searching against HMDB and LIPID MAPS, the application of CCS retrieval or CCS prediction improved lipid identification by reducing the possible hits. In conclusion, this integral platform can significantly improve the chromatographic separation and the reliability of lipids identification in lipidomics studies. It is the first report that systematically compares the lipidomic difference of three reputable Panax species, providing useful information for their quality control in addition to ginsenoside analysis.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CELLULAR AND MOLECULAR MEDICINE
·
2021
·Vol. 25
·期 15
·7472-7484
·
IF 5.31
Pengfei Zhu,Zhengchao Wang,Zhenxing Sun,Bokai Liao,Yu Cai
Osteoarthritis (OA) is a common joint disease that mainly affects the diarthrodial joints. Treatments for OA include non-pharmacological interventions, topical and oral therapies, intra-articular therapies and joint surgery. However, all the treatments mentioned above mainly aim to control the symptoms instead of improving or reversing the joint condition. In this research, we observed the effect of recombinant platelet-derived growth factor (PDGF)-BB on OA in a monosodium iodoacetate (MIA)–induced rat model and revealed the possible mechanisms. In vitro, the level of inflammation in the chondrocytes was gradually alleviated, and the apoptosis rate was gradually decreased by PDGF-BB at increasing concentrations. The levels of p-p38, Bax and caspase-3 decreased, and the level of p-Erk increased with increasing PDGF-BB concentration. In vivo, PDGF-BB could significantly reverse chondrocyte and matrix loss. Furthermore, high concentrations of PDGF-BB could alleviate cartilage hyperplasia to remodel the tissue. The level of collagen II was up-regulated, and the levels of collagen X and apoptosis were down-regulated by increasing concentrations of PDGF-BB. In conclusion, recombinant PDGF-BB alleviated OA by down-regulating caspase-3-dependent apoptosis. The effects of PDGF-BB on OA mainly include inhibiting chondrocyte loss, reducing cartilage hyperplasia and osteophyte formation, and regulating collagen anabolism.
研究领域:
骨科
·
分子生物学
·
细胞生物学
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shumeng Wu,Caixia Feng,Bingbing Fan,Yonghong Li,He Wang,Yanmei Zhou
Heteroatoms-doped hierarchical porous carbons have attracted considerable interest owing to their efficient utility in supercapacitors . However, the increase of defects tends to sacrifice the electrical conductivity of carbon materials. Therefore, it is of great significance to build a good conductive network by increasing the graphitization degree of porous carbons . Here, this study reports the use of serine phosphate protic salt ([Seri][H 2 PO 4 ]), Pluronic F127 and cobalt nitrate to engineer the N/O/P co-doped hierarchical porous graphitic carbon materials. The Co 2+ catalyzes the graphitization of porous carbons under high temperature. A large number of mesopores, highly doped heteroatoms (O: 4.2 wt%, N: 4.07 wt%, P: 0.81 wt%) and conductive carbon skeleton boost the ultrafast transport of electrons and ions, resulting in high specific capacitance, wide operating voltage and outstanding rate performance. The symmetric supercapacitor assembled in KOH electrolyte shows good frequency response with the scan rate up to 1.5 V s −1 on the working voltage of 0–1.3 V. At the same time, when the power density reaches up to 21.3 kW kg −1 , its energy density remains 8.74 W h kg −1 . Furthermore, the symmetric supercapacitor delivers a high energy density of 81.42 W h kg −1 at the power density of 875 W kg −1 with an ultrahigh working voltage of 3.5 V in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF 4 ) electrolyte. More promisingly, all-solid device based on the optimized sample exhibits outstanding flexibility, which greatly broadens its practicability. This work marks the importance of the balance between porous structure, heteroatom doping and high conductivity for advanced supercapacitors .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 15
·8743
·
IF 6.208
Baojuan Deng,Yadan Luo,Meijiao Peng,Tao Li,Jianwei Su,Yang Wang,Xuelian Xia,Chengqi Feng,Shuangquan Yao
As a green and efficient component separation technology, organic acid pretreatment has been widely studied in biomass refining. In particular, the efficient separation of lignin byp-toluenesulfonic acid (p-TsOH) pretreatment has been achieved. In this study, the mechanism of the atmospheric separation of bagasse lignin withp-TsOH was investigated. The separation kinetics of lignin was analyzed. A non-simple linear relationship was found between the separation yield of lignin and the concentration ofp-TsOH, the temperature and the stirring speed. The shrinking nucleus model for the separation of lignin was established based on the introduction of mass transfer and diffusion factors. A general model of the total delignification rate was obtained. The results showed that the process of lignin separation occurred into two phases, i.e., a fast stage and a slow stage. The results provide a theoretical basis for the efficient separation of lignin byp-TsOH pretreatment.Keywords:p-toluenesulfonic;lignin;mechanism;kinetics;shrinking nucleus model
研究领域:
生物质能
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 93
·51558-51568
·
IF 3.708
Fangzhuan Liu,Lingyu Wang,Qinjian Yin,Bo Jiang
In the present work, the conductive nanocomposite of poly(p-phenylenediamine)(PpPD)/exfoliated graphene nanoplatelets (GNPs) are synthesized via in situ polymerization under acidic conditions by doping different percentages of GNPs. The interactions between PpPD and GNPs are investigated by utilizing infrared spectra (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV-visible, Raman spectra, thermogravimetric analysis (TGA) and X-ray diffraction (XRD). It is observed that the reticular strip-like PpPD are adsorbed on the surface of the GNPs, which can be fabricated by loading different percentages of GNPs. Thermoelectric properties (electrical conductivity, Seebeck coefficient and thermal conductivity) of pellets obtained by cold pressing are determined at room temperature. Compared with pure PpPD, it is observed that the presence of GNPs is an essential component for the improvement of the thermoelectric properties of the resulting nanocomposite, which reach the maximum of 193.245 S m−1 and 58 μV K−1, while the thermal conductivity of the composites relatively maintains low values even with high GNPs content, resulting in the increase in the dimensionless figure of merit (ZT). The highest ZT value of 3.63 × 10−4 has been obtained for the composite containing 50 wt% GNPs at 55 °C.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）