FIBERS AND POLYMERS
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2017
·Vol. 18
·期 8
·1512-1522
·
IF 1.113
Li Qiaoping,Xu Bin,Wang Yan,Zhuang Linghua,Wang Qiang,Li Chao,Xu Xiaoqing,Wang Guowei
3-methyl-1-ethoxycarbonylimidazolium chloride ([EtMIM]Cl), was synthesized for white hide powder dissolution. White hide powder was successfully dissolved in [EtMIM]Cl, and regenerated from methanol. The dissolution data and thermodynamic parameter of white hide powder in [EtMIM]Cl and [BMIM]Cl were studied. Hydrogen bond basicity (β) and general polarizability (π*) of ILs were determined. The white hide powders were characterized by FT-IR, XRD, and TGA. The results showed that the maximum solubility of white hide powder in [EtMIM]Cl was higher than that in [BMIM]Cl at same dissolution temperature. At same temperature and same solid content, the dissolution time of white hide powder in [EtMIM]Cl was shorter than that in [BMIM]Cl. Density functional theory (DFT) simulation showed that two kinds of hydrogen bonds (C-H/O and C-H/Cl) and eight strong hydrogen bonds are found in [EtMIM]Cl/GPH, while seven hydrogen bonds are found in [BMIM]Cl/GPH. The carboxylic acid ester cationic group in [EtMIM] + has more electronegative ester groups and stronger electronic cloud density oxygen atoms than alkyl group in [BMIM] + , [EtMIM]Cl is easier to destroy the intermolecular or intramolecular hydrogen bonds in white hide powder, so as to accelerate the dissolution of white hide powder in [EtMIM]Cl. The molecular simulation results indicated that both Cl − anions and [EtMIM] + cation played important roles in the white hide powder dissolution.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 19
·4627-4635
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IF 3.431
Li Hongji,Wang Zirun,Wang Xiaonan,Jiang Jiaqi,Xu Yeqing,Liu Xiqing,Yan Yongsheng,Li Chunxiang
Novel molecularly imprinted polymers (MIPs) based on the technique of surface-enhanced Raman scattering (SERS) were successfully prepared. Firstly, ZnO nanorods were fabricated with Ag by reduction of Ag + on the surface of the ZnO nanorods. Then, ZnO/Ag heterostructures were used as the substrate, rhodamine 6G was used as the template molecule, acrylamide was used as the functional monomer, ethylene glycol dimethacrylate was used as the cross-linker, and 2,2′-azobis(2-methylpropionitrile) was used as the initiator to prepare the ZnO/Ag MIPs (ZOA-MIPs). Through characterization analysis, it was proved that the novel ZOA-MIPs exhibited excellent SERS properties and selectivity. Under the optimal conditions, there was a good linear relationship ( R
2 = 0.996) between the Raman signal (at 1654 cm -1 ) and the concentration of the templates, and the detection limit was 10 -13 mol L -1 . It was also proved that the ZOA-MIPs had the property of self-cleaning, resulting in good reusability. It is envisaged that the sensitivity of SERS coupled with the selectivity of MIPs could result in a promising chemosensor for practical applications.
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PubMed
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2016
·Vol. 311
·期 1
·655-661
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IF 0.983
Wang Zhifen,Zhang Jianying,Chen Jiang,Zhang Zhiqiang,Zheng Qing,Li Jinying,Wu Tao
A through-diffusion method was used to investigate the Re(VII) (as a surrogate to 99 Tc(VII)) diffusion in compacted illite-, hematite- and limonite-montmorillonite mixtures. The effective diffusion coefficient D
e values were in the range of (4.29–6.71) × 10 −11 m 2 /s at pH 3.0 and (3.44–5.72) × 10 −11 m 2 /s at pH 9.0, respectively. Compared to montmorillonite, both D
e and α values enhanced at least three-folds in montmorillonite mixtures, indicating that the impurities changed the diffusion path. Interestingly, the K
d values of (0.63–3.94) × 10 −4 kg/m 3 were found in montmorillonite mixtures. However, the change of D
a value was less than two-folds, indicating that the illitization and iron corrosion of a back-fill material had no obvious influence on Re(VII) diffusion velocity.
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Nano Research
·
2016
·Vol. 10
·期 2
·690-703
·
IF 8.893
Ding Jie,Liang Tingxizi,Zhou Ying,He Zhiwei,Min Qianhao,Jiang Liping,Zhu Junjie
Drug resistance renders standard chemotherapy ineffective in the treatment of connective tissue growth factor (CTGF)-overexpressing breast cancer. By co-embedding the breast tumor cell-penetrating peptide (PEGA-pVEC) and hyaluronic acid (HA) as a targeting media, novel cascaded targeting nanoparticles (HACT NPs) were created on a rattle mesoporous silica (rmSiO 2 ) scaffold for the pinpoint delivery of siRNAs along with an anticancer drug, aiming at overcoming the drug resistance of CTGF-overexpressing breast cancer in vivo . The targeting nanoparticles selectively accumulated in the vasculature under the guidance of the PEGA-pVEC peptide, cascaded by receptor-mediated endocytosis with the aid of another targeting agent, HA, presenting a greater in vivo tumor targeting ability than single targeting ligand vectors. In addition, an HA shell prevented the leakage of therapeutic drugs during the cargo transport process, until the hyaluronidase (HAase)-triggered degradation upon lysosomes entering, guaranteeing a controllable drug release inside the target cells. When the protective shell disintegrates, the released siRNA took charge to silence the gene associated with drug resistance, CTGF, thus facilitating doxorubicin-induced apoptosis. The cascaded targeting media (PEGA-pVEC and HA) advances precision-guided therapy in vivo , while the encapsulation of siRNAs into a chemotherapy drug delivery system provides an efficient strategy for the treatment of drug resistance cancers.
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MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 1
·137-145
·
IF 4.831
Dai Liming,Du Xiaojiao,Jiang Ding,Chen Wei,Zhu Mingyue,Wang Kun
The authors have coupled ultrafine α-Fe 2 O 3 nanocrystals to N-doped graphene (NG) to obtain a novel material for use in a photoelectrode. The presence of NG is shown to strongly affect the morphology and size of the α-Fe 2 O 3 nanocrystals formed on the NG sheets, and to improve their photoelectrochemical (PEC) activity. Interestingly, the PEC performance of the nanocomposite is closely correlated to the size of the α-Fe 2 O 3 nanocrystals in that small nanocrystals display better PEC properties. The photocurrent of α-Fe 2 O 3 -NG is nearly 3.3-fold stronger than that of α-Fe 2 O 3 nanocrystals. Based on the remarkable PEC performance of this nanocomposite, a PEC sensor was constructed for the sensitive determination of 1,4-dihydroxybenzene (HQ). Its photocurrent increases with the HQ concentration in the range from 3.0 nM to 3.3 μM, and the detection limit is 1.0 nM (at an S/N ratio of 3). In our perception, the study presented here can serve as a basis for a better understanding of the relationship between morphologies and PEC performance of such nanomaterials. Conceivably, it may be extended to other PEC sensing system and to other fields associated with nanotechnology.
Ultrafine α-Fe 2 O 3 nanocrystals were prepared via coupling with N-doped graphene (NG) substances (α-Fe 2 O 3 -NG). They exhibit superior photoelectrochemical (PEC) performance and have been successfully utilized for PEC-based sensing.
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JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 24
·期 3
·679-683
·
IF 1.385
Li Xueai,He He,Ren Lili
The monolithic hydrophobic mesoporous alumina aerogels were successfully synthesized by acid–base sol–gel polymerization of aluminium chloride hexahydrate (AlCl 3 ·6H 2 O) in deionized water/alcohol solution (v/v = 3:7). To minimize shrinkage during drying, alumina hydrogels were aged in tetraethylorthosilicate (TEOS)/acetonitrile solution, and modified using trimethylchlorosilane (TMCS)/acetonitrile solution. Properties of the final product were examined by contact angle measurement, FTIR, FESEM, TEM and BET analyses. Surface modification was confirmed by FTIR spectroscopy. It was found that hydrophobic property of the alumina aerogels was affected by the contents of TMCS. When the molar ratio of TMCS to AlCl 3 ·6H 2 O is 0.35, hydrophobic alumina aerogels shows lower bulk density (0.453 g/cm 3 ) and higher surface area (495 m 2 /g) than those of unmodified alumina aerogels (0.933 g/cm 3 , 413 m 2 /g).
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Advanced Fiber Materials
·
2025
·
IF 21.3
Du Jiani,Li Tian,Li Jiatong,Tang Jingyuan,Zhang Runhua,Liu Yanan,Feng Jiamin,Meng Fanbin
Fabrics have attracted significant attention in the field of electromagnetic shielding due to their unique grid structure, high electrical conductivity, and flexibility. To enrich the research of textiles for microwave absorption, two-dimensional transition metal carbide (MXene)-enhanced reduced graphene oxide-based fabrics (MXene/RGO fabrics) were synthesized in this paper by using wet spinning–ionic cross-linking–chemical reduction strategy. MXene/RGO fabrics achieve a minimum reflection loss of − 58.3 dB at 17.6 GHz and a thickness of 2.4 mm, with an effective absorption bandwidth of 4.92 GHz. In addition, the combination of electromagnetic finite element simulation technology and test results was used to further elucidate the response mode and loss mechanism of MXene/RGO fabrics. The MXene/RGO composite fibers exhibit a tuned attenuation ability and impedance matching performance, which is attributed to the increased polarization relaxation loss caused by the large number of heterogeneous interfaces between RGO, MXene, and TiO 2 particles, as well as the appropriate electrical conductivity (16.6 S/cm). MXene/RGO fibers exhibit excellent microwave absorption performance, mechanical strength (534 MPa), easy modification, and fatigue resistance, promising stable absorption of electromagnetic waves in complex environments, thereby expanding the application scenarios of fabrics in the field of microwave absorption. Graphical
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 27
·1-11
·
IF 2.8
Wang Haohuan,Gong Wen,Yuan Ying,Wu Jinsuo,Wen Sen,Liu Xianghua
The overall performance of 3D printed epoxy resin falls short of meeting the demands for the production and advancement of insulating components in electrified transportation equipment. This article introduces an approach for enhancing the dielectric characteristics of a composite epoxy resin oriented with hexagonal boron nitride by incorporating nano-alumina. Consequently, a 3D printed composite epoxy resin comprising nano-alumina and hexagonal boron nitride is successfully fabricated, demonstrating exceptional physical, chemical, and dielectric properties. The research findings unveil that, when the filler content reaches 3 wt% for nano-alumina and 27 wt% for hexagonal boron nitride, the micro-nano composite epoxy resin exhibits impressive mechanical characteristics while maintaining a significant degree of thermally conductive anisotropy. Specifically, at this precise filler content, the interlayer compatibility within the micro-nano composite epoxy resin experiences a substantial improvement, ultimately resulting in outstanding dielectric performance with a maximum volume resistivity of 5.5 × 10 15 Ω∙cm and a surface resistivity of approximately 6.2 × 10 14 Ω. Furthermore, the micro-nano composite epoxy resin, with in-plane-oriented hBN, exhibits the highest dielectric strength, achieving a peak value of 35.7 kV∙mm −1 at the mentioned filler content. This investigation offers valuable insights into the development of high-performance 3D printed insulation components.
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JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Zhao Fengju,Guo Hui,Yang Wei,Guo Lili,Li Jiaxin,Chen Hanqi
Acetylcholinesterase (AChE) plays an important role in the treatment of human diseases, environmental security and global food supply. In this study, the simple fluorescent indicators and MnO 2 nanosheets were developed and integrated to establish a ratiometric fluorescence sensing system for the detection of AChE activity. Two fluorescence signals could be recorded independently at the same excitation wavelength, which extended the detection range and enhanced the visibility of results. Fluorescence of F-PDA was quenched by MnO 2 nanosheets on account of inner filtering effect. Meanwhile, the nonfluorescent OPD was catalytically oxidized to 2,3-diaminophenazine by MnO 2 nanosheets. The acetylcholine (ATCh) was catalytically hydrolyzed by AChE to enzymatic thiocholine, which decomposed MnO 2 to Mn 2+ , recovered the fluorescence of F-PDA and reduced the emission of ox-OPD. Utilizing the fluorescence intensity ratio F 468 /F 558 as the signal readout, the ratiometric fluorescence method was established to detect AChE activity. Under the excitation wavelength of 410 nm, the ratio F 460 /F 558 against the AChE concentration demonstrated two linear relationships in the range 0.05 -1.0 and 1.0–50 U·L − 1 with a limit of detection (LOD) of 0.073 U·L − 1 . The method was applied to the detection of AChE activity and the analysis of the inhibitor Huperzine-A. Due to the advantages of high sensitivity and favorable selectivity, the method possesses an application prospect in the activity deteceion of AChE and the screening of inhibitors. Graphical Abstract
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JOURNAL OF MATERIALS SCIENCE
·
2024
·
IF 3.5
Sun Haiyang,Ou Junfei,Cheng Liang,Sun Lingyan,Lu Yalin,Liu Wenchang
To improve the deformability of 6061Al–TiC composites, a laminated structure of 6061Al–TiC/6061Al was prepared by combining spark plasma sintering (SPS) and hot roll bonding. T6 treatment was applied to the roll-bonded 6061Al–TiC/6061Al laminated composites. Different contents of TiC nanoparticles were added into the inner 6061Al–TiC composite layers. The effect of the volume fraction of the TiC nanoparticles was revealed on the microstructure characterization, texture evolution and tensile properties. The recrystallization fraction and grain size of the 6061Al–TiC composite layers decreased with increasing TiC nanoparticle volume fraction. The texture in rolled 6061Al–TiC composite layers was characterized by weak Goss and β fiber. After T6 treatment, the texture in the 6061Al was cube component, while the recrystallized grains in the 6061Al–0.2TiC and 6061Al–0.5TiC composite layers exhibited cube and R components, respectively. The tensile strength of the 6061Al–TiC/6061Al laminated composites first increased with the volume fraction of TiC nanoparticles and then decreased when the TiC nanoparticles addition exceeded 0.5 vol%. Whereas, the elongation of the 6061Al–TiC/6061Al laminated composites decreased continuously with increasing the volume fraction of TiC nanoparticles. The ultimate strength and yield strength, respectively reached maximum values of 337 MPa and 316 MPa for the 6061Al–0.5TiC/6061Al laminated composites, and the elongation of the laminated composites was 21.6%. Graphical abstract
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Chemistry Africa-A Journal of the Tunisian Chemical Society
·
2024
·
IF 2.3
Wang Wenchao,An Lianhao,Lei Junrong,Li Dan,Shen Zheluan,Wang Hong,Li Qingyong
Pearl powder has been used in medicine and beauty treatment since ancient times in China. However, it is still unclear whether the biological activities of pearl powder are affected by different extraction methods or not. In this study, we determine the total protein yield, protein molecular weight and biological activities including antioxidant, tyrosinase inhibition and melanogenesis inhibition activities and cytotoxicity of different pearl powder extracts prepared by five different preparation methods. The ultrasonic-assisted extraction (UAE) and microwave-assisted extraction (MAE) of pearl powder were optimized by the response surface method based on total protein yield. Compared with solid-liquid extraction (SLE), the optimized UAE and MAE increased the total protein yield without changing protein molecular weight. In addition, the extract by MAE enhanced the tyrosinase inhibition activity and anti-melanogenesis activity slightly. Acidolysis hydrolyzes macromolecular protein into small molecules with obvious cytotoxicity and low activities. Enzymolysis can hydrolyze macromolecular protein into small molecules with high protein yield and improvement of bioactivities. In the determination of the antioxidant assay, the extract prepared by the enzymolysis showed significant activity. These results suggest that protein molecules of the pearl powder extract are degraded appropriately by enzymolysis to smaller molecules to obtain the enhanced biological activities that can be applied in the cosmetic industry.
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JOURNAL OF PEST SCIENCE
·
2024
·
IF 4.3
Zheng Qun,Yan Wenjuan,Zhu Shiqi,Miao Xiaoran,Wu Jian,Lin Zewei,Huang Suqing,Cheng Dongmei,Xu Hanhong,Zhang Zhixiang,Zhang Peiwen
Gelsemium elegans Benth. ( Loganiaceae ), also known as heartbreak herb, can be used in the manufacture of herbal medicines. Insecticidal activity has also been found and can be used to develop botanical insecticides. This study aimed to reveal the insecticidal mechanism of its extracts against red fire ants and provide strategies for the development of biopesticides and the promotion of green and sustainable agriculture. 16s rRNA, pathohistological, behavioral, and enzyme activity assays were performed to reveal its biological effects, including the effects on non-target organisms. Our results showed that red fire ants exposed to G. elegans extracts exhibited slowed growth, reduced feeding, and decreased aggressiveness. The midgut and its peritrophic membrane of red fire ant were significantly disrupted, the diversity of gut microbial community was reduced, and the balance of microbial composition was disturbed. Significant increases in functional abundance of xenobiotics biodegradation and metabolism pathway and P450s enzyme activity confirmed the toxic stress of G. elegans extract. Functional prediction of Kyoto Encyclopedia of Genes and Genomes pathway showed that the functional abundance of novobiocin biosynthesis, flavonoid biosynthesis, lysosome, proteasome, and wingless/integrated signaling pathways were significantly inhibited in the gut. Besides, G. elegans extracts induced an increase in acetylcholinesterase activity. These results revealed dysregulation of immune system and metabolic functions in red fire ants, as well as toxic effects of G. elegans extracts on physiological functions and nerves. These findings revealed the insecticidal mechanism of G. elegans and supported the development of eco-friendly insecticides for red fire ants.
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危险品化学品经营许可证（带存储）