JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 20
·期 7
·2055-2062
·
IF 2.327
Chen Yalin,Mei Tao,Chen Yi,Wang Jianying,Li Jinhua,Fu Yang,Dai Guangchao,Wang Sheng,Xiong Weilai,Wang Xianbao
In this study, we prepared the porphyrin/reduced graphene oxide (porphyrin/RGO) nanocomposite which combined the excellent electrical conductivity and high specific surface area of RGO and the catalytic effect on the oxidation of guanine and adenine of porphyrin for simultaneous detection of guanine and adenine. Since the nanocomposite had remarkable synergistic effect between porphyrin and RGO, the modified glassy carbon electrode (GCE) exhibited excellent electrochemical catalytic activities and high sensitivity toward the detection of guanine and adenine. The nanocomposite was successfully applied to simultaneous quantitative detection of guanine and adenine with a linear range covering 0.05–150 and 0.2–100 μM, respectively, and the detection limits (LOD) ( S / N = 3) were estimated to be 0.016 μM for guanine and 0.06 μM for adenine. The porphyrin/RGO/GCE was applied for simultaneous detection of trace amounts of guanine and adenine in hydrochloric calf thymus DNA. Moreover, the porphyrin/RGO/GCE was simply fabricated and displayed good reproducibility.
研究领域:
分析化学
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生物医学工程
·
材料科学
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 32
·期 10
·1413-1418
·
IF 1.42
Li Hua-jie,Yu Zhong,Wang Shuang-ping,Zhang Li-ming,Yang Li-qun
Photosensitizer (photosan)-encapsulated micelles were prepared by self-assembly of Photosan with two amphiphilic polysaccharide derivatives, including the cholesteryl conjugated sodium alginate derivative (CSAD) and the deoxycholic acid group conjugated chitosan derivative (DA-Chit). The results of UV-Vis and fluorescence spectroscopy indicated that the hydrogen bonding strength dominated the micelle formation. Methyl viologen was used as a model quencher of photosan. Using the steady-state fluorescence technology, the quenching constants were determined to be 2.05, 1.88 and 0.30 L/mmol for the free photosan, the photosan-CSAD micelle and the photosan-DA-Chit micelle, respectively. This suggested that photosan was protected from quenching of methyl viologen by the polysaccharide micelles. In addition, the protection effect of the photosan-DA-Chit micelle was significantly stronger than that of the photosan-CSAD micelle. The photosan-DA-Chit micelle is thus anticipated for protection of photoactivity of photosan during the blood circulation process in vivo .
研究领域:
药剂学
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生物化学
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DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
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2021
·Vol. 19
·期 1
·1-13
·
IF 10.435
Chen Tong,Chu Qiang,Li Mengyang,Han Gaorong,Li Xiang
Electrodynamic therapy (EDT) has recently emerged as a potential external field responsive approach for tumor treatment. While it presents a number of clear superiorities, EDT inherits the intrinsic challenges of current reactive oxygen species (ROS) based therapeutic treatments owing to the complex tumor microenvironment, including glutathione (GSH) overexpression, acidity and others. Herein for the first time, iron oxide nanoparticles are decorated using platinum nanocrystals (Fe 3 O 4 @Pt NPs) to integrate the current EDT with chemodynamic phenomenon and GSH depletion. Fe 3 O 4 @Pt NPs can effectively induce ROS generation based on the catalytic reaction on the surface of Pt nanoparticles triggered by electric field (E), and meanwhile it may catalyze intracellular H 2 O 2 into ROS via Fenton reaction. In addition, Fe 3+ ions released from Fe 3 O 4 @Pt NPs under the acidic condition in tumor cells consume GSH in a rapid fashion, inhibiting ROS clearance to enhance its antitumor efficacy. As a result, considerable in vitro and in vivo tumor inhibition phenomena are observed. This study has demonstrated an alternative concept of combinational therapeutic modality with superior efficacy.
研究领域:
肿瘤学
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纳米医学
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生物材料学
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2016
·Vol. 34
·期 4
·483-490
·
IF 1.811
Zhang Li-na,Song Yi-hu,Zheng Qiang
Poly(methyl methacrylate) (PMMA) based ionomers with different lanthanum (La(III)) contents (PMMA-XLa) synthesized by free radical solution polymerization were applied to poly(vinyl chloride) (PVC) resins as a kind of multifunctional aids, and their performances were evaluated by measuring the static stability time, initial discoloration, transparency, fusion behavior and tensile strength of the modified PVC. The ionomers with proper lanthanum (La(III)) contents show a better thermal stability efficiency in comparison with traditional stabilizer lanthanum stearate. Meantime, they can accelerate PVC plasticization more efficiently than PMMA. The rigid PVC products stabilized with the ionomers present good transparency and enhanced tensile strength.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
Nanoscale Research Letters
·
2012
·Vol. 7
·期 1
·1-6
·
IF 2.726
Sun Li,Luan Weiling,Shan Yue Jin
A capillary micro-reaction was established for the synthesis of Au-Ag alloy nanoparticles (NPs) with a flexible and controllable composition and grain size by tuning the synthesis temperature, the residence time, or the mole ratio of Au 3+ :Ag + . By extending the residence time from 5 to 900 s, enhancing the temperature from 120°C to 160°C, or decreasing the mole ratio of Au 3+ :Ag + from 1:1 to 1:20, the composition of samples was changed continuously from Au-rich to Ag-rich. The particles became large with the increase of the residence time; however, synthesis temperatures showed less effect on the particle size change. The particle size of the Au-Ag alloy NPs with various composition could be kept by adjusting the mole ratio of Au 3+ :Ag + . TEM observation displayed that the as-obtained NPs were sphere-like with the smallest average size of 4.0 nm, which is half of those obtained by the traditional flask method.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 1
·456-465
·
IF 2.599
Boakye Felix Ofori,Fan Meiling,Cai Haopeng,Zhang Haining
Nitrogen-doped porous carbons with uniformed pore structure and large surface area are promising materials as sorbents for acidic gases and electrocatalysts for oxygen-related reactions. Herein, we report the synthesis of nitrogen-doped porous carbon (NPC) materials through carbonization of imidazole-functionalized polyhedral oligomeric silsesquioxane (POSS) at 900 °C followed by removal of POSS blocks. The imidazole moieties act as both nitrogen and carbon sources and the POSS blocks are nano-sized hard templates. The resulting NPC has a surface area of 980 m 2 g −1 with average pore size of 4.7 nm and the pyridinic nitrogen in the formed NPC contribute to about 33% of overall nitrogen species. The carbon dioxide adsorption property and the electrocatalytic performance toward oxygen reduction reaction of the formed NPC are further evaluated. The formed NPC materials exhibit a total carbon dioxide adsorption capacity of 0.30 mmolg −1 at 30 °C under the partial pressure of carbon dioxide of 0.2 bar. Although the formed NPC is less active than commercial Pt/C catalyst for oxygen reduction reaction, the half-wave potential shifts to the negative side by only about 10 mV after 10000 cycling tests, demonstrating the great stability of the formed NPC materials.
研究领域:
材料科学
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环境科学
·
电化学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 327
·期 1
·565-573
·
IF 1.371
Chen Qi,Lu Chuan,Hu Yifu,Liu Yaoyang,Zhou Yu,Jiao Caishan,Zhang Meng,Hou Hongguo,Gao Yang,Tian Guoxin
The extraction behavior of several lanthanide ions (La(III), Nd(III), Sm(III), Gd(III), Yb(III)) from the nitric acid medium using ionic liquid [C 4 mim][NTf 2 ] solvent containing N,N’-dimethyl-N,N’-dioctyl-3-oxadiglycolamide (DMDODGA) was studied. The effects of the concentration of HNO 3 , H + and NO 3 − in aqueous phase, as well as the DMDODGA concentration and temperature on the distribution ratio of Ln(III) were analyzed. The distribution ratio of lanthanide ions into [C 4 mim][NTf 2 ] is much higher than that reported for aliphatic hydrocarbon diluents. The extraction mechanism was demonstrated to agree with the cation-exchange mechanism. The stoichiometric ratio of Ln (III)/DMDODGA complex is 1:3 or 1:4.
研究领域:
化学
·
材料科学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 86
·期 2
·431-440
·
IF 1.745
Sun Xi,Ma Jingtao,Chen Xiaotong,Li Ziqiang,Deng Changsheng,Liu Bing
ZrC–ZrO 2 composite ceramic microspheres were prepared by internal gelation combined with carbothermic reduction using fructose as a chelating agent and carbon source. Fructose in the precursor solution formed complex with zirconium ions, which was conducive to the refining of the microstructure of the sintered composite. ZrC–ZrO 2 composite with ZrC content as high as 60 wt% could be prepared.
In this paper, fructose was used as a chelating agent and an organic carbon source to prepare ZrCO microspheres by internal gelation and carbothermic reduction. The fructose in the precursor solution could form complex with zirconium ions, which was conducive to the refining of the microstructure of the sintered composite. ZrC–ZrO 2 composite with crystal size of ZrO 2 and ZrC in nanometer range and ZrC content as high as 60 wt% could be successfully prepared.
研究领域:
材料科学
·
无机化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 24
·22297-22311
·
IF 2.22
Guan Yiyin,Liu Wenjie,Zuo Shixiang,Yuan Kun,Wu Fengqin,Ji Jinjin,Yao Chao
In this paper, rutile phase titanium oxide/Sb-SnO 2 /anatase phase titanium oxide (TiO 2 (R)/C-TiO 2 (A)) heterostructured nanocomposites were prepared by a sol–gel method and a hydrothermal method. By optimizing the mass ratio between TiO 2 (R) and C-TiO 2 (A), the rod-ball heterostructures of TiO 2 (R)/C-TiO 2 (A) were formed and exhibited enhanced simulated sunlight-driven photocatalytic desulfurization performance. According to the results, the desulfurization rate of TiO 2 (R)/C-TiO 2 (A) was 93.98% after 60 min, which is higher than C-TiO 2 (A) and TiO 2 (R)/TiO 2 (A). In addition, the photocatalytic recyclability test indicated that after three times the reuse of TiO 2 (R)/C-TiO 2 (A) could still reach 85.98%. The enhanced photocatalytic performance could be attributed to the double Z-scheme heterojunction in the TiO 2 (R)/C-TiO 2 (A) and the uniformly structure of rod array, which resulted in the higher separation efficiency of electrons and holes. Furthermore, the results of photocatalytic active radical species trapping experiments showed that the main substances in the photocatalytic reaction are ∙O 2 − and h + . This paper also established the double Z-scheme heterojunction reaction mechanism.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 24
·21177-21184
·
IF 2.195
Zheng Jiahong,Cheng Kangkang,Yu Pengfei
A simple fluorescence sensor for the detection of sulfadimidine (SM 2 ) was fabricated by molecular imprinting technology. Cadmium telluride quantum dots (CdTe QDs) as the fluorescent material, 3-aminopropyltriethoxysilane (APTES) as functional monomer, sulfadimidine as template molecule and tetraethoxysilane (TEOS) as cross-linker, the CdTe QDs were embedded in silica nano-particles by reverse microemulsion method. Under optimal detection condition, response is linear in the 2–30 μmol L −1 SM 2 concentration condition with the detection limit was 0.4 μmol L −1 . In addition, the correlation coefficient was 0.9857 and the imprinting factor was 4.82. The fluorescent probe was successfully applied to the determination of SM 2 in tap water and milk sample with the spiked recoveries ranging from 99.8 to 103.2%. It gets a good specific recognition ability and potential practical application value.
研究领域:
分析化学
·
材料科学
·
环境科学
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DOI
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Li Ruili,Liu Lin,Ju Xiaohua,Feng Ji,Wang Jiemin,Guo Jiangping,He Teng,Chen Ping
The essential role of metal–support interaction in ammonia synthesis was investigated by using a Pr 6 O 11 supported Ru nanoparticles (NPs) catalyst system. Loading of Ru NPs onto the Pr 6 O 11 support with relatively low surface area yields similar metal dispersion with respect to conventional SiO 2 support. The Ru NPs on the Pr 6 O 11 was found to exhibit excellent catalytic performance in ammonia synthesis, superior to free-standing Ru NPs and Ru NPs on conventional SiO 2 support. Detailed structure analysis results reveal that the superior activity of Ru/Pr 6 O 11 can be attributed to the enhanced interaction between the Ru NPs and Pr 6 O 11 , which can modulate the electronic structure of Ru NPs and trigger catalytic ammonia synthesis over Ru NPs on Pr 6 O 11 . Furthermore, nitrogen isotope exchange experiment reveals that superior nitrogen dissociation ability is essential for the excellent activity and intrinsic activity of Ru/Pr 6 O 11 in ammonia synthesis. These findings demonstrate that Pr 6 O 11 can be used as a new kind of support for preparation of efficient Ru-based catalysts for ammonia synthesis, and also open up opportunities for design of Pr 6 O 11 supported metal catalysts for other catalytic reactions. Graphitical Abstract Interaction between the Ru NPs and Pr 6 O 11 can modulate the electronic structure of Ru NPs and trigger catalytic ammonia synthesis over Ru NPs on Pr 6 O 11 .
研究领域:
催化化学
·
材料科学
·
物理化学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Liang Yutao,He Juan,Huang Zhipeng,Li Huayu,Zhang Yunxia,Wang Huige,Rui Chaofan,Li Yuanyuan,You Liqin,Li Kai,Zhang Shusheng
A surface imprinted polymer of type UiO-66-NH2@MIP was prepared by combining molecular imprinted polymers (MIPs) and an amino-functionalized zirconium-based metal-organic framework. Quercetin is used as the virtual template, UiO-66-NH 2 acts as the carrier to which the monomer acrylamide can be copolymerized. The material was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. It was used as a sorbent in a solid-phase extraction column. The extraction conditions were optimized. The adsorption capacities for aflatoxins AFB1, AFB2, AFG1 and AFG2 by this SPE and by the commercial SPE were compared. The method was successfully applied to quantify the aflatoxins in grain. Figures of merit include (a) good linearity (range from 0.20–45 μg·kg −1 ) with R 2 (range from 0.9986–0.9994), (b) low detection limits (90–130 ng·kg −1 ), (c) acceptable reproducibility (1.0–5.9%; for n = 6), and (d) relatively satisfactory recovery rates (74.3–98.6%). The new sorbent has good selectivity and reusability.
UiO-66-NH 2 @MIPs were synthesized with modified UIO-66-NH 2 as core and quercetin as pseudo template. A cartridge was prepared with the polymers as the sorbent, and its performance was compared with different commercial SPE cartridges.
研究领域:
分析化学
·
食品科学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）