JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 2
·1-11
·
IF 2.101
Du Yingying,Yang Ping,Matras-Postolek Katarzyna,Wang Junpeng,Che Quande,Cao Yongqiang,Ma Qian
A silanization process was employed to transfer hydrophobic quantum dots (QDs) prepared via an organic route at high temperature into water phase. The QDs were further coated with a thin organic SiO 2 shell to form QDs@SiO 2 composite nanoparticles by ligand exchange or remaining initial organic ligands on the surface. In this study, QDs with different ligands, either trioctylphosphine oxide (TOPO) or oleic acid (OA), were employed to investigate the effects of ligands on the reverse micelles in preparing QDs@SiO 2 nanoparticles. In the preparing process, hydrophobic QDs were silanized by partially hydrolyzed tetraethyl orthosilicate (TEOS). For TOPO-capped CdSe QDs, surface TOPO ligands were completely replaced by partially hydrolyzed TEOS. As for OA-capped CdSe/Cd
x
Zn 1− x
S QDs, surface OA ligands were partially replaced. It was found that the ligand exchange drastically reduced the photoluminescence (PL) efficiency of CdSe QDs. Furthermore, the cytotoxicity studies of QDs@SiO 2 have been carried out in detail. The results indicate that CdSe/Cd
x
Zn 1− x
S QDs@SiO 2 composite nanoparticles exhibit lower cytotoxicity compared with CdSe QDs@SiO 2 , because the SiO 2 shell and remained OA ligand layer can effectively prevent the leakage of toxic Cd 2+ ions. Meanwhile, it was found that these CdSe/Cd
x
Zn 1− x
S QDs@SiO 2 nanocomposites could keep excellent PL properties even for 24 h incubating with Siha cells, which indicating that our prepared composite nanoparticles are potentially applicable for cell imaging in biological systems.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 10
·2543-2555
·
IF 3.125
Zhang Yanjie,Du Shuaijing,Feng Zijie,Du Yingxiang,Yan Zhi
In recent years, chiral ionic liquids (CILs) have attracted more and more attention in the field of enantioseparation. In this study, two novel spirocyclic chiral ionic liquids, 1-butyl-3-methylimidazolium(T-4)-bis[(2 S )-2-(hydroxy-κO)-3-methylbutanoato-κO]borate (BMIm + BLHvB − ) and 1-butyl-3-methylimidazolium (T-4)-bis[(α S )-α-(hydroxy-κO)-4-methylbenzeneacetato-κO]borate (BMIm + BSMB − ), were applied for the first time in capillary electrophoresis (CE) to establish synergistic systems for enantiomeric separation. Significantly improved separations of five tested analytes were observed in the CILs synergistic systems based on three β-cyclodextrin derivatives (CD), compared with conventional single CD separation systems. Several principal parameters such as CILs concentration, cyclodextrin concentration, buffer pH, and applied voltage were systematically investigated with BMIm + BLHvB − /hydroxypropyl-β-CD selected as a model system to optimize the enantioseparation. Molecular modeling was applied to further demonstrate the chiral recognition mechanism of the CILs/hydroxypropyl-β-CD synergistic system, which showed a good agreement with the experimental results.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 6
·6188-6192
·
IF 1.798
Wu Yeqiu,Jin Guangya,Liu Zhijian,He Tao
Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ /Bi 3+ particles with spherical morphology are synthesized by microwave-assistant hydrothermal process. The results show that cubic phase Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ /Bi 3+ particles with uniform size and spherical shape are obtained. The doping Eu 3+ and Bi 3+ ion have no influence on the phase and morphology of samples. In the hydrothermal process, the fast and homogeneous microwave heating benefits the formation of samples with uniform size and spherical shape. Both Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ /Bi 3+ show dominant red emission originating from the 5 D 0 → 7 F 2 transition of Eu 3+ . The codoping Bi 3+ can enhance the intensity of Eu 3+ emission.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 3
·823-831
·
IF 1.385
Yuan Junjie,Xiong Jun,Wang Jiahong,Ding Wenjing,Yang Lei,Zhang Ming,Zhu Wenshuai,Li Huaming
A supported catalyst was synthesized on the mesoporous materials with ionic liquid modified by the silicontungstic acid (HSiW-IL/SBA-15). A series of characterization, such as XRD, N 2 adsorption desorption, SEM, TEM and XPS analysis showed that HSiW was successfully immobilized onto the IL modified SBA-15 and maintained the SBA-15 mesoporous structure. Compared with HSiW and HSiW/SBA-15, the catalyst HSiW-IL/SBA-15 had excellent catalytic activity for oxidative desulfurization of fuels. After analysis, the high activity of HSiW-IL/SBA-15 was attributed to the catalyst with large specific surface area, pore size and hydrophobic performance, which had a better wettability for fuel. The catalyst had a good recycling performance, and the sulfur removal still remained 96.4 % after eight times cycle.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 9
·4320-4327
·
IF 2.302
Dai Fei,Chen Feng,Wang Tao,Feng Shaoguang,Hu Chunlin,Wang Xinling,Zheng Zhen
Epoxy adhesive as an engineering material has more and more applications in industry. But to date, water resistance of the adhesive is still a very difficult problem to be solved. By mimicking mussel adhesive proteins, dopamine (DA) was applied as one of the two curing agents of epoxy adhesive to improve the water resistance of the adhesive, and the other was phenethylamine (PEA). The effects of the contents of DA on both adhesion property and water absorption of epoxy/PEA/DA adhesives were investigated in detail. The results of lap shear test (LST) showed that the adhesion strength of the epoxy adhesives after the introduction of proper amount of DA was still up to 7 MPa even after the sample was immersed in water for over 230 days. And then the effects of metal ions Zn(II) and Fe(III) on the adhesion properties of the epoxy adhesives were also further studied. It was found that the adhesion strength of the adhesives, when the content of DA was no more than 5 wt%, can be further increased through the complexation of a small quantity of ferric ions with DA. The coordination mechanism of catechol with Fe(III) ions in the system has been investigated by both UV/Vis spectra and XRD curves. The results testified that more bis-catecholate complexes form at high DA: Fe ratios and thus the adhesives have higher cohesion strength for having more regular structures after curing. In a word, the introductions of proper amount of DA and metal ion endow the epoxy adhesive better water resistance and excellent adhesion properties.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 8
·1-7
·
IF 2.02
Liao Bo,Lv Han,Deng Xiaoting,He Benqiao,Liu Qingquan
Spiropyran-modified silicon quantum dots (Si QDs) were successfully fabricated through covalently linking the aminated Si QDs and spiropyrans. In comparison with Si QDs, the fluorescence emission peaks of the Si QDs in the spiropyran-modified Si QDs always locate at 525 nm irrespective of the excitation wavelengths. The spiropyran-modified Si QDs showed reversible photoluminescence. Blue-green fluorescence of the spiropyran-modified Si QDs could be gradually switched off, and red fluorescence could be gradually switched on with UV irradiation. The process could be reversible with visible light irradiation. The reversibly switchable photoluminescence of the spiropyran-modified Si QDs using UV and visible light irradiation could also be multiply repeated with good stability. Therefore, the spiropyran-modified Si QDs could be a promising candidate in many potential application areas such as photo-switch, data storage, and biolabeling and bioimaging.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 24
·5697-5709
·
IF 3.431
Qi Feifei,Jian Ningge,Qian Liangliang,Cao Weixin,Xu Qian,Li Jian
A simple and efficient three-step sample preparation method was developed and optimized for the simultaneous analysis of illegal anionic and cationic dyes (acid orange 7, metanil yellow, auramine-O, and chrysoidine) in food samples. A novel solid-phase extraction (SPE) procedure based on nanofibers mat (NFsM) was proposed after solvent extraction and freeze-salting out purification. The preferred SPE sorbent was selected from five functionalized NFsMs by orthogonal experimental design, and the optimization of SPE parameters was achieved through response surface methodology (RSM) based on the Box-Behnken design (BBD). Under the optimal conditions, the target analytes could be completely adsorbed by polypyrrole-functionalized polyacrylonitrile NFsM (PPy/PAN NFsM), and the eluent was directly analyzed by high-performance liquid chromatography-diode array detection (HPLC-DAD). The limits of detection (LODs) were between 0.002 and 0.01 mg kg −1 , and satisfactory linearity with correlation coefficients ( R > 0.99) for each dye in all samples was achieved. Compared with the Chinese standard method and the published methods, the proposed method was simplified greatly with much lower requirement of sorbent (5.0 mg) and organic solvent (2.8 mL) and higher sample preparation speed (10 min/sample), while higher recovery (83.6–116.5%) and precision (RSDs < 7.1%) were obtained. With this developed method, we have successfully detected illegal ionic dyes in three common representative foods: yellow croaker, soybean products, and chili seasonings.
Schematic representation of the process of the three-step sample preparation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-9
·
IF 2.833
Luo Xiaona,Ma Kai,Jiao Tifeng,Xing Ruirui,Zhang Lexin,Zhou Jingxin,Li Bingbing
The effective synthesis and self-assembly of graphene oxide (GO) nanocomposites are of key importance for a broad range of nanomaterial applications. In this work, a one-step chemical strategy is presented to synthesize stable GO-polymer Langmuir composite films by interfacial thiol-ene photopolymerization at room temperature, without use of any crosslinking agents and stabilizing agents. It is discovered that photopolymerization reaction between thiol groups modified GO sheets and ene in polymer molecules is critically responsible for the formation of the composite Langmuir films. The film formed by Langmuir assembly of such GO-polymer composite films shows potential to improve the mechanical and chemical properties and promotes the design of various GO-based nanocomposites. Thus, the GO-polymer composite Langmuir films synthesized by interfacial thiol-ene photopolymerization with such a straightforward and clean manner, provide new alternatives for developing chemically modified GO-based hybrid self-assembled films and nanomaterials towards a range of soft matter and graphene applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 4
·1109-1116
·
IF 4.58
Xia Jie,Zhuang Yu-Ting,Yu Yong-Liang,Wang Jian-Hua
Carbon polymer dots (CPDs) were prepared by a one-pot aqueous synthetic route from ascorbic acid and diethylenetriamine at room-temperature. The CPDs under 350-nm excitation exhibit blue fluorescence peaking at 430 nm with a quantum yield of 47%. Other features include an average diameter of 5 nm, a fluorescence that is independent of the excitation wavelength, good water dispersibility and photostability, and excellent biocompatibility. The CPDs are shown to be viable fluorescent probes for ferric ion which acts as a strong quencher. The response to Fe(III) is linear in the 0.2 to 10 μM concentration range, and the detection limit is 0.1 μM. The probe was applied to the determination of Fe(III) in environmental waters and to intracellular imaging of ferric ions in HeLa cells.
Carbon polymer dots (CPDs) are prepared from ascorbic acid and diethylenetriamine (DETA) at room-temperature (RT). The RT-CPDs exhibit excellent optical performance, biocompatibility and selectivity of quenching by ferric ions. This can be applied for determination and intracellular imaging of ferric ion.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Analysis and Testing
·
2017
·Vol. 1
·期 1
·1-7
·
IF 0
Zhou Langjun,Peng Yi,Hu Yuling,Li Gongke
Conjugated microporous polymers (CMPs) are a kind of porous skeleton polymers, which are characterized by extended conjugated skeletons, large specific surface area and structure stability. In this work, a facile and versatile method was developed to fabricate flexible conjugated microporous polymer films for fast detecting the total quantity of developing agents and their oxidation products. Conjugated microporous polymer films were synthesized through in situ one-step approach by Suzuki coupling reaction. With such merits such as intense luminescence, easy synthesis and disposability, the polymer films were employed to detect developers based on fluorescence quenching in the printing wastewater. A linear response to p -benzoquinone, oxidation product of developers, was obtained in the range of 0.05–0.5 μmol·L −1 , with a detection limit of 0.015 μmol·L −1 . The strategy for in situ growth of flexible polyphenylene-conjugated microporous polymer (PP-CMP) films seems to be a very portable and general method for meeting different analytic purposes.
✓ 已验证
产品关联
DOI
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-8
·
IF 2.833
Zhang Z. L.,Men B. Q.,Liu Y. F.,Gao H. P.,Mao Y. L.
Precursor solution of CH 3 NH 3 PbI 3-x Cl x for perovskite solar cells was conventionally prepared by mixing PbCl 2 and CH 3 NH 3 I with a mole ratio of 1:3 (PbCl 2 :CH 3 NH 3 I). While in the present study, CH 3 NH 3 PbI 3-x Cl x -based solar cells were fabricated using the precursor solutions containing PbCl 2 and CH 3 NH 3 I with the mole ratios of 1:3, 1.05:3, 1.1:3, and 1.15:3, respectively. The results display that the solar cells with the mole ratio of 1.1:3 present higher power conversion efficiency and less I-V hysteresis than those with the mole ratio of 1:3. Based on some investigations, it is concluded that the higher efficiency could be due to the smooth and pinhole free film formation, high optical absorption, suitable energy band gap, and the large electron transfer efficiency, and the less I-V hysteresis may be attributed to the small low frequency capacitance of the device.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 42
·期 9
·6959-6973
·
IF 1.833
Danish Muhammad,Gu Xiaogang,Lu Shuguang,Xu Minhui,Zhang Xiang,Fu Xiaori,Xue Yunfei,Miao Zhouwei,Naqvi Muhammad,Nasir Muhammad
The role of reactive oxygen species (ROSs) and effect of solution matrix have been investigated for the degradation of trichloroethylene (TCE). Zeolite-supported nano iron (Z-nZVI) was synthesized as an activator to catalyze sodium percarbonate (SPC) with or without hydroxylamine, i.e. as reducing agent (RA). The probe tests confirmed the generation of OH · and O
−· 2
in the Z-nZVI activated SPC system in absence of the RA, while the presence of RA significantly increased the generation of OH · and O
−· 2
radicals. Scavenger tests demonstrated that OH · was the main ROS responsible for TCE degradation, whereas O
−· 2
also participated in TCE degradation. From the solution matrix perspective, the experimental results confirmed significant scavenging effects of Cl − (1.0, 10.0, and 100 mmol L −1 ) and HCO 3
− (1.0 and 10.0 mmol L −1 ), whereas the scavenging effects were fairly impeded at 100 mmol L −1 concentration of HCO 3
− . On the other hand, a considerable decline in scavenging effect was observed in the presence of RA in tested Cl − and HCO 3
− concentration ranges. In addition, negligible scavenging effects of NO 3
− and SO 4
2− anions were found in all tested concentrations. The effect of initial solution pH on catalytic activity indicated a significant increase in the TCE degradation in the presence of RA even at higher pH value of 9. The results indicated that the Z-nZVI activated SPC system in presence of RA can effectively degrade chlorinated organic solvents, but it is important to consider the intensive existence of anions in groundwater.
✓ 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）