Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development

Nanning, China

Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development

Nanning, China
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Chen W.,Guangxi University | Liu D.,Guangxi University | Wu W.,Guangxi University | Wu W.,Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2017

A series of Dy3+ doped Co–Ni–Zn ferrites with the formula Co0.5Ni0.25Zn0.25DyxFe2−xO4 0≤x≤0.24) have been successfully synthesized using the solvothermal method. X-ray diffraction and scanning electron microscope examinations indicate that a highly-crystallized cubic Co0.5Ni0.25Zn0.25DyxFe2−xO4 with rod-like morphology is obtained when the precursor is calcined at 1000 °C in air for 3 h. Single phase Co0.5Ni0.25Zn0.25Fe2O4 is obtained at 650 °C, but all samples consist of the main spinel phase in combination of a small amount of a foreign Dy2O3 phase after doping Dy. When the precursor is calcined at 1000 °C, the lattice parameter of the ferrites initially increase after doping Dy, but then become smaller with increasing Dy content. The addition of Dy content results in a reduction of crystallite size, attributed that the binding energy of Dy3+–O2− is larger than that of Fe3+–O2−. Dy3+ substitution can decrease the remanence (Mr) and coercivity (Hc) of Co0.5Ni0.25Zn0.25DyxFe2−xO4 samples, which are very desirable characteristics for high density data storage devices. © 2016 Elsevier B.V.


Chen W.,Guangxi University | Wu W.,Guangxi University | Wu W.,Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development | Wu X.,Guangxi University | And 3 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2017

Co0.5Ni0.3Zn0.2AlxFe2−xO4 (0.0 ≤ x ≤ 0.21) rods are synthesized by a solvothermal method using glycol as template and surfactant. X-ray diffraction, scanning electron microscope, and vibrating sample magnetometer are employed to evaluate structural, morphology, and magnetic properties of the as-prepared ferrites. The X-ray diffraction analysis indicates that single phase spinel ferrites are obtained when the precursor is calcined above 750 °C in air for 3 h. After being calcined at 950 °C, the lattice parameters of the ferrites initially decrease with increase in Al3+ content, but then increase (x = 0.21). The addition of Al3+ ion decreases the average crystallite size. This is because the electron orbital tends to be completed. The scanning electron microscope micrographs of the synthesized samples show the presence of large-area arrays of ferrite rods. The possible formation mechanism for the synthesis of ferrites rods has been preliminarily explained. Magnetic property tests indicates that when the Al3+ doping amount is increased from 0 to 0.21, the specific saturation magnetization (Ms) values initially increase from 74.37 to 80.01 emu/g and then decrease to 76.77 emu/g, while the coercivity (Hc) values increase from 245.61 to 345.96 Oe at first, then decrease to 317.04 Oe. The results can be explained by Neel’s two sublattice and Yafet-Kittle configuration models. © 2017 Springer Science+Business Media New York


Shao X.,Guangxi University | Zheng X.,Guangxi University | Zou W.,Guangxi University | Luo Y.,Guangxi University | And 5 more authors.
Electrochimica Acta | Year: 2017

Three-dimensional free-standing nanoarray electrodes with hierarchical structure grown on carbon cloth substrate have attracted great interest for flexible energy storage devices. However, the direct growth of active material with a large mass loading on carbon fibers is difficult because of the hydrophobic nature. Herein, “two-step” growth route is adopted to achieve high-loading Ni-Co carbonate hydroxide nanowire arrays, in which the effect of electrochemical pre-activation is discussed. A facile and novel process is used to boost the areal capacity by converting Ni-Co carbonate hydroxide nanowires to hydroxide nanowire-supported nanoplate arrays in an alkaline solution. The areal capacity of the as-soaked free-standing Ni-Co hydroxide nanoarrays electrode increases from 856 mC·cm−2 (152 C·g−1) to 1944 mC·cm−2 (348 C·g−1) and 3028 mC·cm−2 (542 C·g−1) at 2 mA·cm−2 after soaking for 8 h and 16 h. The electrochemical pre-activation is important for achieving high mass loading as well as high rate capability. Moreover, the as-soaked electrode is employed as the positive electrode for hybrid supercapacitor. The device possesses a high areal capacitance of 1.47 F·cm−2 at 1 mA·cm−2, a large energy density of 6.7 mWh·cm−3 at 11.6 mW·cm−3. This work gives an insight for designing high-loading three-dimensional electrodes and paves a new way to construct binder-free film electrode for high-performance hybrid supercapacitor applications. © 2017 Elsevier Ltd


Lu D.-W.,Guangxi University | Wu X.-Y.,Guangxi University | Xie X.,Guangxi University | Yu K.-L.,Guangxi University | And 2 more authors.
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2017

Two novel cinnamic acid oxime ester derivatives were designed and synthesized with o-methoxy cinnamic acid and p-substituted benzaldehyde. Their structures were characterized by mass spectrometry, infrared spectroscopy, and nuclear magnetic resonance. The interaction mechanism of derivatives and human serum albumin (HSA) were explored by molecular docking, fluorescence spectroscopy, UV-visible absorption spectroscopy and site marker competitive experiments.The binding constants and corresponding thermodynamic parameters of the derivative-HSA systems were calculated by Stern-Volmer equation. Combined with UV-Vis absorption spectra, the results indicate that the derivatives can get complexes with HSA respectively and strongly quench the intrinsic fluorescence of HSA, and hydrogen bonds and van der Waals forces are main acting forces. Site marker competitive experiments indicate that the binding of the derivatives to HSA primarily take place in sub-domain ⅡA. The above results verify the prediction of molecular simulation experiment. © 2017, Science Press. All right reserved.


Zhou Y.,Guangxi University | Wu X.,Guangxi University | Wu W.,Guangxi University | Wu W.,Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development | And 2 more authors.
Journal of Superconductivity and Novel Magnetism | Year: 2017

La0.67Ca0.33Mn1−xNixO3 (0 ≤x ≤ 0.3) is synthesized by solid-state reaction at low temperatures, followed by calcination in air. The precursor and its calcined products are characterized by thermogravimetry and differential scanning calorimetry, x-ray powder diffraction, scanning electron microscopy, and vibrating sample magnetometer. A high-crystallized La0.67Ca0.33Mn1−xNixO3 with an orthorhombic structure is obtained when the precursor is calcined at 900∘C in air for 3 h. Crystallite size of La0.67Ca0.33Mn1−xNixO3 increases with the increase of Ni content, attributed to the decrease of lattice strains of the La0.67Ca0.33Mn1−xNixO3 with the increase in Ni content. Nickel substitution can markedly improve coercivity and specific magnetization of La0.67Ca0.33Mn1−xNixO3. The coercive field (9 Oe) of La0.67Ca0.33Mn0.7Ni0.3O3 is higher, even at 293 K, indicating that La0.67Ca0.33Mn0.7Ni0.3O3 continues being ferromagnetic above 260 K (Curie temperature for LCMO). © 2017 Springer Science+Business Media, LLC


Liu F.,Guangxi University | Tang P.,Guangxi University | Ding R.,Guangxi University | Liao L.,Guangxi University | And 4 more authors.
Dalton Transactions | Year: 2017

A glycosylation strategy based on click chemistry was employed to develop a naphthalimide-based Fe3+ fluorescent probe with low cytotoxicity and good water-solubility. The selectivity and sensitivity to Fe3+ of three synthesized naphthalimide-based fluorescent probes follows a Nap-PZ < Nap-OH < Nap-Glc trend, because Nap-PZ was modified with a good water-soluble group. The cytotoxicity follows a Nap-PZ > Nap-OH > Nap-Glc trend, because the exposed toxic group of Nap-PZ was shielded by a good biocompatible group. The detection limit toward Fe3+ ion follows a Nap-PZ (7.40 × 10-6 M) > Nap-OH (2.73 × 10-7 M) > Nap-Glc (4.27 × 10-8 M) trend. Moreover, Nap-Glc could be used to detect Fe3+ in living cells. The fluorescent "off-on" response of Nap-Glc towards Fe3+ could be recognized by the naked eye, and the "off-on" fluorescent mechanism also was demonstrated by theoretical calculations. Therefore, Nap-Glc is a novel glucosyl naphthalimide fluorescent probe for environmental or biological detection of Fe3+ with low cytotoxicity and good water-solubility. © 2017 The Royal Society of Chemistry.


Chen W.,Guangxi University | Wu W.,Guangxi University | Wu W.,Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development | Liu D.,Guangxi University | Wu J.,Guangxi University
Journal of Materials Science: Materials in Electronics | Year: 2016

Four kinds of Ni–Cu–Mg based ferrites materials having the general formula Ni0.5Cu0.25Mg0.25DyxFe2−xO4 (0.0 ≤ x ≤ 0.24) have been successfully synthesized using the solvothermal method. X-ray diffraction and scanning electron microscope examinations confirm that a rod-like Ni0.5Cu0.25Mg0.25DyxFe2−xO4 with cubic spinel structure is obtained when the precursor is calcined above 850 °C in air for 3 h. Single phase Ni0.5Cu0.25Mg0.25Fe2O4 is obtained at 850 °C, but all samples consist of the main spinel phase in combination of a small amount of foreign Dy2O3 and/or DyFeO3 phases after doping Dy3+. When the precursor is calcined at 1000 °C, the lattice parameters of the ferrites initially decrease after doping Dy3+(x = 0.08), but then become larger with additional Dy3+ doping. The addition of Dy3+ decreases the average crystallite size, and results in higher coercivity (Hc) and squareness (Mr/Ms) as compared to un-substituted Ni–Cu–Mg ferrites. In this study, Ni0.5Cu0.25Mg0.25Dy0.24Fe1.76O4, obtained at 1000 °C, exhibits the highest coercivity of 149.29 Oe and squareness (0.3055). © 2016 Springer Science+Business Media New York


Wu X.,Guangxi University | Chen W.,Guangxi University | Wu W.,Guangxi University | Li H.,Guangxi University | Lin C.,Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development
Journal of Electronic Materials | Year: 2016

Four types of Co-Ni based ferrites materials with the general formula LixCo0.5Ni0.5−xFe2O4 (0.0 ≤ x≤0.3) were successfully synthesized by thermal decomposition of oxalates in air. The effect of substitution of diamagnetic Li+ ions for partial Ni2+ ions in a spinel lattice on the crystalline structure and the magnetic properties of Co-Ni ferrites was studied. X-ray diffraction examination confirms that a high-crystallized LixCo0.5Ni0.5−xFe2O4 with cubic spinel structure is obtained when the precursor is calcined at 900°C in air for 3 h. The substitution of Li+ ions for partial Ni2+ ions does not change the spinel crystalline structure of MFe2O4, but crystallinity of LixCo0.5Ni0.5−xFe2O4 can be improved. The incorporation of Li+ ions in place of Ni2+ ions in Co-Ni ferrites decreases the average crystallite size and results in higher specific saturation magnetization as compared to un-substituted Co-Ni ferrites. In this study, Li0.1Co0.5Ni0.4Fe2O4, obtained at 900°C, exhibits the highest specific saturation magnetization of 88 emu/g ± 2 emu/g and magnetic moment (3.60 μB ± 0.05 μB). © 2016 The Minerals, Metals & Materials Society


Chen Z.,Guangxi University | Hu W.,Guangxi University | Wang M.,Guangxi University | Wang L.,Guangxi University | And 3 more authors.
Carbohydrate Research | Year: 2016

A glycosyl-rhodamine fluorescent probe with good water-solubility has been designed and synthesized through click reaction. Compared with control compound 1, the obtained target compound (RBGlc-3) could be independently applied for the detection of Hg2+ in water medium, and not disturbed by Ce3+, Eu3+, Ca2+, Cd2+, Fe2+, Ba2+, Co2+, Cu2+, Zn2+, Pb2+, Mg2+, Ni2+, K+, Ag+, Na+, NH4 +, CH3COO-, S2O4 2-, SO4 2-, SO3 2- and Cl-. 1:1 Stoichiometry is the most likely recognition mode of RBGlc-3 toward Hg2+ ion, and the OFF-ON fluorescent mechanism of RBGlc-3 is proposed. © 2016 Elsevier Ltd.


Zhou Y.,Guangxi University | Chen W.,Guangxi University | Shen Y.,Guangxi University | Wu X.,Guangxi University | And 3 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2015

LixCu0.6Mg0.4-xFe2O4 (0.0≤x≤0.3) is obtained by calcining precursor oxalates over 900 °C in air. The precursor and its calcined products are characterized by thermogravimetry and differential scanning calorimetry, X-ray powder diffraction, scanning electron microscopy, and vibrating sample magnetometer. A high-crystallized LixCu0.6Mg0.4-xFe2O4 with a cubic structure is obtained when the precursor is calcined at 900 °C in air for 3 h. The lattice constants of the ferrites decrease after Li+ doping. Magnetic properties of LixCu0.6Mg0.4-xFe2O4 depend on the composition and calcination temperature. Cu0.6Mg0.4Fe2O4 obtained at 900 °C has the highest specific saturation magnetization value, 42.44 emu/g; remanence value of Li0.2Cu0.6Mg0.2Fe2O4 obtained at 900 °C is close to zero. © 2015 Elsevier B.V. All rights reserved.

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