COLLOID AND POLYMER SCIENCE
·
2013
·Vol. 291
·期 9
·2191-2202
·
IF 2.161
Zhao Yingyuan,Du Wei,Sun Limei,Yu Li,Jiao Jingjing,Wang Rui
Calcium carbonate (CaCO 3 ) nanocrystals with controllable polymorph and morphology have been successfully synthesized with the aid of an effective control agent, a halogen-free, low-cost ionic liquid surfactant, 1-butyl-3-methylimidazolium dodecylsulfate ([C 4 mim][C 12 SO 4 ]) in a supersaturated aqueous solution. For the first time, facile preparation of pure lens-like vaterite, sheet-like calcite, and peanut-like aragonite was all achieved in the [C 4 mim][C 12 SO 4 ] aqueous solution through changing the concentration, temperature, and initial pH value and adding magnesium ions. Washed by water and ethanol, all the aggregates were free of [C 4 mim][C 12 SO 4 ] and can be stable at least 1 month in air. The crystal form of the aggregates changed from pure calcite to pure vaterite at room temperature only through increasing [C 4 mim][C 12 SO 4 ] concentration. Formation of the ordered CaCO 3 structures is mainly ascribed to the aggregation of the primary nanoparticles whose formation mechanism is related to the change of supersaturation. This study can provide a facile and environment-friendly method to fabricate CaCO 3 crystal aggregates with various morphologies and polymorphs and can be used for large-scale industrial production and biomimetic synthesis.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 66
·期 3
·512-517
·
IF 1.66
Cui Hongtao,Wang Minmin,Ren Wanzhong,Liu Yan,Zhao Yunan
Silica monoliths embedded with high concentration of γ-Fe 2 O 3 or TiO 2 nanoparticles were prepared by a sol–gel procedure designed according to the inherent properties of oxide colloids. In the first step, highly dispersible oxide nanoparticles were produced using an in situ modification sol–gel strategy. Then, these particles were re-dispersed in silicon alkoxide-containing solution to form a stable colloidal solution. The hydrolysis and condensation reactions of alkoxide were catalyzed by an organic base (morpholine). Due to the large molecule size of morpholine, the electric double layer on the surface of colloidal particles was not compressed by the ionized morpholine molecules. The colloidal solution thus remained stable during the gelation process. Through this procedure, oxide nanoparticles could be immobilized homogeneously in the pores of a silica matrix, forming highly transparent and crack-free monoliths.
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 11
·2831-2839
·
IF 2.41
Yang Yi,Gao Hejun,Lu Fei,Zheng Liqiang
Poly-(vinyl alcohol) (PVA) proton-conducting composite membranes were prepared using succinic acid (SA) as a cross-linking agent and Brønsted acidic ionic liquid (BAIL) as a proton source. The incorporated BAILs resulted in a relatively high proton conductivity compared with PVA/SA membrane without BAILs. The proton conductivities of PVA/SA/BAIL composite membranes increased versus the BAIL content. In addition, the optimal resultant proton conductivity of PVA/SA/BAIL composite membrane under dry condition could reach 0.4 mS/cm at 140 °C, which was higher than that of PVA/sulfosuccinic acid (SSA) composite membrane (0.032 mS/cm), PVA/SSA/5-aminotetrazole membrane (0.022 mS/cm at 130 °C), and PVA/chlorosulfonic acid/glutaraldehyde membrane (0.0585 mS/cm at 90 °C) measured at the same condition. It was notable that the PVA/SA/BAIL composite membranes could reach high thermal stability up to 150 °C, which was higher than that of traditional PVA membranes (below 80 °C).
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2014
·Vol. 302
·期 1
·575-581
·
IF 1.415
Dai Ying,Zhang Anyun
A new supermolecular recognition agent named tetra - tert -butyl-calix[4]-bis[(4-methly-1,2-phenylene-crown-6] ( Tert ButylCalixC) was synthesized. Batchwise experiments of extraction of Na(I), K(I), Rb(I), Cs(I), Sr(II), Ba(II), Ru(III) and Fe(III) from aqueous solution with Tert ButylCalixC/ o -nitroanisole were carried out. Effects of HNO 3 concentration, contact time and temperature on the extraction behavior were examined. The equilibrium established within 30 min implied a fast extraction kinetics. The optimal operation temperature was 298 K. Stoichiometry of Tert ButylCalixC and Cs(I) by electrospray ionization mass spectrometry characterization revealed 1:1 molar ratio. It was observed that the extraction system of Tert ButylCalixC/ o -nitroanisole was effective for selective removal of Cs(I), showing remarkable separation performance.
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
·
2014
·Vol. 8
·期 2
·420-427
·
IF 1.802
Li Yanling,Zhao Fengchun,Zhao Longyu,Yang Zhengyou
For simultaneously monitoring two classes of organophosphorus pesticide residues in food samples, a polyclonal antibody against a dual-generic hapten immunogen, which was prepared by conjugating two generic haptens ( O , O -dimethyl thiophosphate hapten and O , O -diethyl phosphate hapten) to the same carrier protein BSA, was raised and used to develop a broad-specificity competitive indirect enzyme-linked immunosorbent assay. With the optimized conditions, the developed immunoassay was able to detect 11 organothiophosphate pesticide and 5 organophosphate pesticide residues with detection limits of 0.018–0.135 μg/mL and 0.013–0.171 μg/mL, respectively. Recoveries of paraoxon-ethyl, fenamiphos, parathion-methyl, and fenthion from spiked samples ranged between 85.8 and 105.5 %. The results indicated that the immunoassay developed in this study is suitable for high-throughput screening of these low-molecular-weight contaminants in food samples.
✓ 已验证
产品关联
DOI
高影响因子
AMINO ACIDS
·
2014
·Vol. 46
·期 9
·2219-2229
·
IF 3.653
Ruan Zheng,Yang Yuhui,Zhou Yan,Wen Yanmei,Ding Sheng,Liu Gang,Wu Xin,Liao Peng,Deng Zeyuan,Assaad Houssein,Wu Guoyao,Yin Yulong
This study was conducted to investigate effects of chlorogenic acid (CGA) supplementation on serum and hepatic metabolomes in rats. Rats received daily intragastric administration of either CGA (60 mg/kg body weight) or distilled water (control) for 4 weeks. Growth performance, serum biochemical profiles, and hepatic morphology were measured. Additionally, serum and liver tissue extracts were analyzed for metabolomes by high-resolution 1 H nuclear magnetic resonance-based metabolomics and multivariate statistics. CGA did not affect rat growth performance, serum biochemical profiles, or hepatic morphology. However, supplementation with CGA decreased serum concentrations of lactate, pyruvate, succinate, citrate, β-hydroxybutyrate and acetoacetate, while increasing serum concentrations of glycine and hepatic concentrations of glutathione. These results suggest that CGA supplementation results in perturbation of energy and amino acid metabolism in rats. We suggest that glycine and glutathione in serum may be useful biomarkers for biological properties of CGA on nitrogen metabolism in vivo.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 7
·1-12
·
IF 2.278
Zhao Lianhong,Yan Xiufang,Jie Zhiqiang,Yang Hong,Yang Shiping,Liang Jie
Regenerable antimicrobial N -halamine/silica hybrid nanoparticles (NPs) containing chlorinated 5,5-dimethylhydantoinyl (Cl-DMH) groups, Cl-DMH/SiO 2 hybrid NPs, have been prepared by a co-condensation reaction between N -(3-triethoxysilylpropyl)-5,5-dimethylhydantoin (TS-DMH) and tetraethoxysilane (TEOS) and then a chlorination reaction in NaClO solution. The as-synthesized Cl-DMH/SiO 2 NPs were characterized by transmission electron microscopy, Scanning electron microscopy, X-ray photoelectron spectra, Specific surface area, Differential scanning calorimetry, and Fourier transform infrared. Experimental results showed that the size of the as-synthesized Cl-DMH/SiO 2 NPs could be well adjusted by changing the mass ratio of TS-DMH/TEOS and the volume ratio of 28 % NH 4 OH/H 2 O. Antimicrobial tests showed that the as-prepared Cl-DMH/SiO 2 hybrid NPs had excellent antimicrobial activities against both Escherichia coli and Staphylococcus aureus . The minimum inhibitory concentration and minimum bactericidal concentration values of the as-prepared Cl-DMH/SiO 2 hybrid NPs are 15 and 20 μg/mL for S. aureus , 25 and 30 μg/mL for E. coli , respectively. Paper disk diffusion assay showed that smaller-sized Cl-DMH/SiO 2 hybrid NPs have bigger inhibition zone diameters, indicating stronger antimicrobial efficacies. Also, the storage stability and regenerability of Cl-DMH/SiO 2 hybrid NPs were investigated.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2015
·Vol. 22
·期 11
·1-8
·
IF 1.92
Wei Wan-Chu,Feng Shuo,Zheng Cai-Xia,Liang Guo-Dong,Gao Hai-Yang,Wu Qing,Zhu Fang-Ming
Amphiphilic fluorescent diblock copolymers containing a pyrene-labelled polystyrene (PyPS) block, PyPS-block-poly(acrylic acid) (PyPS- b -PAA) and PyPS-block-poly(ethylene oxide) (PyPS- b -PEO) were synthesized by atom transfer radical polymerization (ATRP). All resultant diblock copolymers and intermediates were characterized by nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography (GPC). PyPS- b -PAA in water and PyPS- b -PEO in water or ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide ([EMIM][TFSI]) can self-assemble into spherical nanomicelles with diameters less than 100 nm. Glass transition and fluorescent quantum yield of the core-forming PyPS block confined in the self-assembled spherical nanomicelles were investigated by fluorescence spectroscopy. A dramatic reduction of glass transition temperature ( T
g
) of the PyPS block within PyPS- b -PEO nanomicelles was observed relative to PS or PyPS bulk. However, in aqueous dispersions, the PyPS block within PyPS- b -PAA nanomicelles exhibited an analogous T
g near to PS or PyPS bulk. Moreover, the fluorescent quantum yield of the PyPS block within the self-assembled nanomicelles in aqueous dispersions is much higher than that of PyPS- b -PEO in toluene solution as well as its bulk.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 50
·期 6
·2429-2442
·
IF 2.305
Zhang Han,Xue Yanan,Huang Juan,Xia Xiaoyang,Song Meifang,Wen Kaikai,Zhang Xiaoxiao,Luo Xiaogang,Cai Ning,Long Sihui,Yu Faquan
A charge reversible, magnetic-targeted, and pH-responsive nano therapy system assembled from citraconic-modified dextran (Dex–COOH), glycine-stabilized superparamagnetic iron oxide nanoparticles (SPION–NH 2 ), and doxorubicin (DOX) through electrostatic interaction was designed for delivering therapeutics to tumor cells. Dex–COOH was first synthesized to build the pH-sensitive citraconic amide bond and further render charge reversal upon the cleavage of the linkage. The SPION–NH 2 anchored in the nanocarrier endows the carrier with magnetic migration. The vibrating sample magnetometer analysis exhibits the superparamagnetic behavior, and the magnetic saturation value is estimated to be 39.6 emu (g Fe) −1 . The change of size and the reversal of zeta potential from negative to positive in acidic environment confirmed these expected responsibilities. The DOX-loaded nanocarriers contain DOX up to 13.0 wt%. An in vitro release profile demonstrated an efficient DOX release of 80 % at pH 5.0 while of 27 % at pH 6.8 and 13 % at pH 7.4, suggesting a pH-induced release mechanism. Microscopic images of Prussian blue staining, quantification of cellular iron and protein concentration displayed apparent iron uptake by HeLa cells. Confocal laser scanning microscopy observations revealed that the nanocarriers could efficiently deliver and release DOX into the nuclei of HeLa cells. MTT assays testified that DOX-loaded nanocarrier exhibited high anti-tumor activity with IC 50 of 0.7 μg mL −1 , while plain nanocarriers were practically non-toxic. This drug delivery system has shown the ability to improve the chemotherapeutic efficacy and to reduce the side effects, indicating great potential for delivery of drugs to the targeted sites in patients.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 12
·1-8
·
IF 2.278
Li Jinjie,Shen Huaibin,Zhou Changhua,Li Ning,Wang Hongzhe,Li Lin Song
We report a facile method for the synthesis of size-controlled triangular CuInS 2 (CIS) semiconductor nanocrystals (NCs) in the organic phase, and then, molecular metal chalcogenide complexes capped CIS NCs can be synthesized by exchanging original organic compounds with (NH 4 ) 4 Sn 2 S 6 inorganic ligands in environmentally benign solvent. The properties of CIS NCs (coated by both organic and inorganic ligands) were characterized by UV–Vis spectroscopy, fourier transform infrared, transmission electron microscopy, X-ray diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy, and dynamic light scattering. CuInS 2 NCs (before and after ligand exchange) films were spin coated on cleaned ITO glass substrates, and the charge transport properties were detected by current-voltage characteristic. We observed that the ligands on the surface of CIS NCs have been exchanged successfully, and the electrical transparency of (NH 4 ) 4 Sn 2 S 6 -CIS NCs films was obviously increased than CIS NCs with organic capping ligands.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2014
·Vol. 45
·期 2
·131-138
·
IF 2.147
Fan Yang,Yang Xin,Cao Zhen,Chen Shufang,Zhu Bing
Mesoporous CuO microspheres with core-in-hollow-shell structure were synthesized by one-pot hydrothermal method, using dicyandiamide as hydrolysis agent and poly(vinylpyrrolidone) as soft template. The as-synthesized CuO microspheres were characterized by powder X-ray diffraction, field-emission scanning electron microscopy and N 2 sorption measurements. The core-in-hollow-shelled CuO microspheres exhibit greatly enhanced amperometric response towards glucose as compared to that of the simple hollow counterpart. The as-developed non-enzymatic glucose sensor exhibited favorable performance with wide linear range (0.005–7.95 mM), sensitivity of 622.2 μA mM cm −2 and low detection limit of 1 μM.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2014
·Vol. 182
·期 3
·879-885
·
IF 3.719
Wu Qiuhua,Zhou Xin,Sun Meng,Ma Xiaoxing,Wang Chun,Wang Zhi
A magnetic microporous carbon material was synthesized from sucrose and using a zeolite as a hard template, followed by the in situ chemical coprecipitation of Fe(II) and Fe(III) ions to impart magnetism. The resulting material was used as a sorbent for the extraction of the phthalic acid esters (PAEs) dimethyl phthalate, diethyl phthalate, diallyl phthalate and di-n-propyl phthalate. Following desorption with acetone, the PAEs were quantified by HPLC. The effects of the amount of the sorbent, extraction time, sample pH, salt addition and desorption conditions were optimized. Under the optimum conditions, the calibration plots are linear in the 0.1–50 ng mL −1 concentration range, and the limits of detection (at an S/N of 3) are at 30 pg mL −1 as demonstrated in the analysis of fruit juice samples.
A magnetic microporous carbon material was successfully synthesized through a hard template method followed by the in situ chemical coprecipitation of Fe 2+ and Fe 3+ . The material was used as an adsorbent to extract four phthalate esters from fruit juice samples prior to their determination by high performance liquid chromatography
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）