JOURNAL OF POLYMER RESEARCH
·
2014
·Vol. 21
·期 6
·1-8
·
IF 1.897
Yue Zhouying,Cai Yang-Ben,Xu Shiai
A new symmetrical diamine that contains benzimidazole ring, 6,6’-bis[2-(4-aminophenyl)benzimidazole], was synthesised directly from p -aminobenzoic acid and 3,3’-diaminobenzidine via benzimidazolisation condensation. The diamine monomer was polymerised with various commercial dianhydrides by a conventional two-step polymerisation reaction to obtain the corresponding polyimides. The obtained polyimides were amorphous and could be used to produce flexible, yet tough, transparent films exhibiting excellent thermal stability with glass transition temperatures of 334 °C to 412 °C and 5 % weight loss temperatures above 540 °C in nitrogen. These polymers also demonstrated outstanding mechanical properties with a tensile strength of 177 MPa to 224 MPa and a tensile modulus of 3.5 GPa to 5.7 GPa. The excellent thermal and mechanical properties of these polyimides are most likely attributable to the rigid-rod structure and the presence of hydrogen bond between the macromolecular chains.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 12
·7877-7891
·
IF 5.044
Ma Jianhua,Pu Haihong,He Pengxin,Zhao Qiangli,Pan Shaoxue,Wang Yaowu,Wang Chen
Multifunctional fibers have attracted widespread attention due to applications in flexible smart wearable devices. However, simultaneously obtaining a strong and functional woven fiber is still a great challenge owing to the conflict between the properties mentioned above. Herein, mechanically strong and highly conductive cellulose/carbon nanotube (CNT) composite fibers were spun using an aqueous alkaline/urea solution. The microstructure as well as physical properties of the resulting fibers were characterized via scanning electron microscopy, infrared spectroscopy, mechanical and electrical measurement. We demonstrated that carboxylic CNTs can be well dispersed in alkali/urea aqueous systems which also dissolved cellulose well. The subsequent wet spinning process aligned the CNTs and cellulose molecules inside the regenerated composite fiber well, enhancing the interaction between these two components and endowing the composite fiber having a 20% CNT loading with an excellent mechanical strength of 185 MPa. Benefiting from the formation of conductive paths, the composite fiber with the diameter of about 50 μm possessed an electrical conductivity value in the range of 64–1274 S/m for 5–20 wt% CNT loading. This excellent mechanical strength and high electrical conductivity enable the composite fiber to exhibit a great potential in joule heating; the heating temperature of cellulose/CNT-20 fiber reached more than 55 °C within 15 s at 9 V. In addition, the multifunctional filaments are further manufactured as a water sensor to measure humidity. This work provides a potential material that can be applied in the fields of wearable electronics and smart flexible fabrics. Graphic abstract
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高影响因子
MICROCHIMICA ACTA
·
2014
·Vol. 181
·期 9
·911-916
·
IF 3.719
Deng Hao-Hua,Li Guang-Wen,Liu Ai-Lin,Chen Wei,Lin Xin-Hua,Xia Xing-Hua
We demonstrate a sensitive and rapid colorimetric assay for selective detection of copper ions based on the strong coordination between Cu(II) ions and the tetrahydroxyaurate anions [Au(OH) 4 ] − on the surface of thermally treated bare gold nanoparticles (GNPs). The method for making the unmodified GNPs is simple and results in a nanomaterial with a highly specific response to Cu(II). The thermal treatment of the bare GNPs and the recognition of Cu(II) ions is accomplished in a single step within 5 min. The presence of Cu(II) causes the color to change from red to purple-blue. The limit of detection (LOD) is 0.04 μM of Cu(II) when using UV–vis spectrometry and ratioing the absorbances at 650 and 515 nm, respectively. The method also is amenable to bare eye (visual) inspection and in this case has an LOD of 2.0 μM of Cu(II).
Due to the strong coordination of Cu(II) ions with the tetrahydroxyaurate anions [Au(OH) 4 ] - on the thermally treated bare GNPs, Cu(II) can directly induce the aggregation of the GNPs, resulting in an obvious color change from wine-red to purple-blue.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 27
·期 2
·1966-1973
·
IF 1.569
Lu Changyu,Guan Weisheng,Hoang Tuan K. A.,Guo Jifeng,Gou Haigang,Yao Yiliang
In this work, Fe-series (Fe, Co, Ni) doped titanate nanotubes were synthesized via a simple, one pot hydrothermal process using commercial TiO 2 powder as the precursor. The samples were characterized by X-ray diffraction, nitrogen adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy, and UV–Vis. SEM and TEM results show that regularly uniform nanotubes were obtained and they possess homogeneous tubular structures with open ends. There is no significantly morphological and structural difference between TiNTs and Fe-series doped TiNTs. Furthermore, the photocatalytic properties of TiNTs and Fe-series doped TiNTs were studied using the degradation of ciprofloxacin. Fe-series doped TiNTs exhibit higher catalytic activities than those of TiNTs and commercial TiO 2 .
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 9
·5596-5605
·
IF 4.682
Wang Meng,Chen Ming,Wang Qiuping,Yan Liqiang,Li Lin,Wang Xiuli,Wu Xiongzhi,Lei Chenghong
In this work, antimicrobial agent polylysine was deliberately used to functionalize carbon nanotubes and activated carbon to load antimicrobial enzyme lysozyme. Antimicrobial activity of the loaded lysozyme on polylysine-functionalized carbon materials was significantly enhanced, and the functionalizing agent exhibited its own apparent antimicrobial activity as well. Remarkably, antimicrobial ɛ-polylysine synergistically enhanced antimicrobial activity of loaded lysozyme on its functionalized carbon nanotubes to more than five times as high as the activity of free lysozyme in solution, in sharp contrast to that of loaded lysozyme on unfunctionalized carbon nanotubes or activated carbon, or functionalized activated carbon. The actual antimicrobial activity of loaded lysozyme on functionalized carbon nanotubes was applied with Bacillus subtilis , exhibiting much faster digesting lysis of the bacteria in comparison with free lysozyme. The results indicate that polylysine on carbon nanotubes played a dual role as the functionalizing and antimicrobial agent as expected. Synergistic and potent antimicrobial activities from combined action of antimicrobial enzyme and antimicrobial agent on carbon nanotubes provide a new antimicrobial protection for food and beverage industry and other biochemical processes.
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高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·552-561
·
IF 5.693
Yan Jia,Niu Yanfei,Wu Chunhua,Shi Zhengjun,Zhao Ping,Naik Nithesh,Mai Xianmin,Yuan Bingnan
As antimicrobial agents, essential oils (EOs) have been used by more and more companies as alternatives to traditional chemicals. In the study, seven EOs from Pinus massoniana , cinnamon , Star anise , Litsea cubeba , Cinnamomum camphora , Lemon eucalyptus , and Camphor from Guangxi were researched for their antifungal performances and chemical components. With the help of the diffusion in a disc way as well as the minimum inhibitory concentration (MIC) to three fungi, the antifungal impacts and the bamboo slices anti-mold tests of these EOs were studied. The compositions of these oils were identified. Litsea cubeba EO, Anise EO, and Cinnamon EO exhibited super antifungal activity against Trichoderma viride , Aspergillus niger , and Penicillium citrinum . Treated by Cinnamon EO, Anise EO, or Litsea cubeba EO, few molds were observed on the surface of bamboo chips, which showed that these EOs had a good antifungal effect on molds of bamboo. Graphical abstract Antifungal effect of seven essential oils on bamboo
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高影响因子
Nano Research
·
2021
·Vol. 15
·期 1
·528-534
·
IF 8.897
Shen Chenqi,Wang Pengtang,Li Leigang,Huang Xiaoqing,Shao Qi
Syngas (CO + H 2 ) is the incredibly important feedstock for producing synthetic fuels and various value-added chemicals. CO 2 electrochemical reduction to syngas is an environmental-friendly and sustainable approach, but still challenging to produce tunable syngas with a wide ratio of CO/H 2 . Herein, by modulating the structure and phase, we have successfully obtained a series of copper-indium (Cu-In) catalysts, which are efficient for producing syngas with tunable CO/H 2 ratios. A series of CuIn bimetallic catalysts with different structures from hollow sphere to two-layer hollow sphere and different phases from CuO to Cu 2 O are developed. We find that the CO and H 2 are the only gaseous products, in which the CO/H 2 ratios can be readily tuned from 1.2 ± 0.1 to 9.0 ± 1.5 by simply controlling the thermal annealing temperature. It also exhibits high durability during a 10-h test. The unique performance is attributed to the modulated In enrichment on the Cu surfaces during the CO 2 reduction reaction, which causes the differences in binding energies for key reaction intermediates, thus resulting in the tunable composition of syngas. The present work emphasizes a simple yet efficient phase and structure modulating strategy for designing potential electrocatalysts for producing syngas with widely tunable CO/H 2 ratios.
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高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2024
·Vol. 22
·期 1
·1-23
·
IF 10.6
Deng Zihan,Yang Chuan,Xiang Tingwen,Dou Ce,Sun Dong,Dai Qijie,Ling Zhiguo,Xu Jianzhong,Luo Fei,Chen Yueqi
Osteoarthritis (OA) is a common degenerative joint disease that can cause severe pain, motor dysfunction, and even disability. A growing body of research indicates that gut microbiota and their associated metabolites are key players in maintaining bone health and in the progression of OA. Short-chain fatty acids (SCFAs) are a series of active metabolites that widely participate in bone homeostasis. Gold nanoparticles (GNPs) with outstanding anti-bacterial and anti-inflammatory properties, have been demonstrated to ameliorate excessive bone loss during the progression of osteoporosis (OP) and rheumatoid arthritis (RA). However, the protective effects of GNPs on OA progression are not clear. Here, we observed that GNPs significantly alleviated anterior cruciate ligament transection (ACLT)-induced OA in a gut microbiota-dependent manner. 16S rDNA gene sequencing showed that GNPs changed gut microbial diversity and structure, which manifested as an increase in the abundance of Akkermansia and Lactobacillus . Additionally, GNPs increased levels of SCFAs (such as butyric acid), which could have improved bone destruction by reducing the inflammatory response. Notably, GNPs modulated the dynamic balance of M1/M2 macrophages, and increased the serum levels of anti-inflammatory cytokines such as IL-10. To sum up, our study indicated that GNPs exhibited anti-osteoarthritis effects via modulating the interaction of “microbiota-gut-joint” axis, which might provide promising therapeutic strategies for OA.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 14
·16484-16495
·
IF 3.056
He Xingyu,Min Xiaobo,Peng Tianyu,Ke Yong,Zhao Feiping,Sillanpää Mika,Wang Yunyan
Ball-milling is considered as an economical and simple technology to produce novel engineered materials. The ball-milled microscale zero valent iron/pyrite composite (BM-ZVI/FeS 2 ) had been synthesized through ball-milling technology and applied for highly efficient sequestration of antimonate (Sb(V)) in aqueous solution. BM-ZVI/FeS 2 exhibited good Sb(V) removal efficiency (≥ 99.18%) at initial concentration less than 100 mg Sb(V)/L. Compared to ball-milled zero valent iron (ZVI) and pyrite (FeS 2 ), BM-ZVI/FeS 2 exhibited extremely higher removal efficiency due to the good synergistic adsorption effect. BM-ZVI/FeS 2 showed efficient removal performance at broad pH (2.6–10.6). Moreover, the coexisting anions had negligible inhibition influence on the Sb(V) removal. The antimony mine wastewater can be efficiently remediated by BM-ZVI/FeS 2 , and the residual Sb(V) concentrations (< 0.96 μg/L) can meet the mandatory discharge limit in drinking water (5 μg Sb/L). Experimental and model results demonstrated that endothermic reaction and chemisorption were involved in Sb(V) removal by BM-ZVI/FeS 2 . The XRD and XPS analyses confirmed that the complete corrosion of ZVI occurred on BM-ZVI/FeS 2 after Sb(V) adsorption, resulting in the enhanced Sb(V) sequestration. Mechanism analyses showed that the excellent removal performance of BM-ZVI/FeS 2 was ascribed to the high coverage of iron (hydr)oxide oxidized from ZVI. Because of the advantages of economical cost, high Sb(V) removal capacity and easy availability, BM-ZVI/FeS 2 offers a promising adsorbent for Sb(V) remediation.
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3565-3572
·
IF 4.58
Li Mingshi,Wang Yanying,Ye Xiaoxue,Wang Zhengguo,Wu Tsunghsueh,Li Chunya
Icosahedral gold nanocrystals (AuNCs) were synthesized by using the ionic liquid (IL) 1-(10-bromodecyl)-3-methyl-imidazolium bromide as a morphology-controlling reagent. The novel IL 1,3-di-(3-mercaptopropyl)-imidazolium bromide was employed as a bifunctional monomer to integrate the AuNCs onto the surface of a glassy carbon electrode (GCE) modified with gold nanoparticles. After interaction with thioglycolic acid (TGA) and activation of the carboxy groups, the antibody against squamous cell carcinoma antigen was immobilized on the modified GCE. Residual active sites were blocked with bovine serum albumin. The new materials and the steps for immunosensor fabrication were fully characterized. The reduction in peak current (using hexacyanoferrate as an electrochemical probe) due to the recognition of SCCA is linearly related to the SCCA concentration in the 0.02 to 10 ng mL −1 concentration range. The detection limit is as low as 12.6 pg mL −1 (at an S/N ratio of 3). The assay was applied to the quantitation of SCCA in human serum samples. The accuracy was validated by comparison with an ELISA method. The two methods displayed excellent consistency.
Icosahedral gold nanocrystals were self-assembled onto a gold nanoparticle modified glassy carbon electrode surface by using 1,3-di-(3-mercaptopropyl)-imidazolium bromide ionic liquid as a linker. Antibody for squamous cell carcinoma antigen was immobilized onto the gold nanocrystal based interface to fabricate an immunosensor.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 40
·期 4
·1575-1581
·
IF 0.88
Liu Feng,Wang Meiyan,Teng Xinhuan,Zhang Peizhi,Jiang Lin
A series of 2-(5-methyl-3-(4-chloro/trifluoromethylphenyl)isoxazol-4-yl)-5-arylamino-1,3,4-oxadiazoles were synthesized from 4-chloro/trifluoromethyl benzaldehyde, ethyl acetoacetate, hydroxylamine hydrochloride, hydrazine hydrate, and aryl isocyanate by multi-step reactions. The structures of the target compounds were elucidated by IR, 1 H NMR, MS, and elemental analysis. All these compounds were tested for in vitro antifungal activities against Botrytis cinerea and Rhizoctonia cerealis by the mycelium growth rate method, and the results indicated that some compounds displayed high antifungal activity against Botrytis cinerea.
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高影响因子
Nano Research
·
2020
·Vol. 14
·期 5
·1471-1478
·
IF 8.183
Shao Weiwei,Li Xiaodong,Zu Xiaolong,Liang Liang,Pan Yang,Zhu Junfa,Wang Chengming,Sun Yongfu,Xie Yi
Photooxidation provides a promising strategy for removing the dominant indoor pollutant of HCHO, while the underlying photooxidation mechanism is still unclear, especially the exact role of H 2 O molecules. Herein, we utilize in-situ spectral techniques to unveil the H 2 O-mediated HCHO photooxidation mechanism. As an example, the synthetic defective Bi 2 WO 6 ultrathin sheets realize high-rate HCHO photooxidation with the assistance of H 2 O at room temperature. In-situ electron paramagnetic resonance spectroscopy demonstrates the existence of •OH radicals, possibly stemmed from H 2 O oxidation by the photoexcited holes. Synchrotron-radiation vacuum ultraviolet photoionization mass spectroscopy and H 2 18 O isotope-labeling experiment directly evidence the formed •OH radicals as the source of oxygen atoms, trigger HCHO photooxidation to produce CO 2 , while in-situ Fourier transform infrared spectroscopy discloses the HCOO* radical is the main photooxidation intermediate. Density-functional-theory calculations further reveal the •OH formation process is the rate-limiting step, strongly verifying the critical role of H 2 O in promoting HCHO photooxidation. This work first clearly uncovers the H 2 O-mediated HCHO photooxidation mechanism, holding promise for high-efficiency indoor HCHO removal at ambient conditions.
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高影响因子
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