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Publications (8)9.56 Total impact

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    ABSTRACT: Magnetic composite particles immobilized with metal affinity ions show high potential in the phosphoproteome mass-spectrometric (MS) analysis. However, the preparation of this kind of materials still suffers from complicated synthesis procedure and high cost. In this work, the magnetic nanostructured composite microspheres (MPCS) incorporated into N-methylene phosphonic chitosan were first fabricated via a facile one-pot synthesis strategy and titanic ions (Ti4+) were subsequently immobilized onto the MPCS to form MPCS-Ti4+ affinity particles. The uniform spherical MPCS-Ti4+ affinity particles with abundant chelated titanic ions have a particle size distribution between 126 nm and 280 nm and they are superparamagnetism with a saturation magnetization (Ms) value of 44.75 emu g-1. The amount of the immobilized Ti4+ ions was estimated to be 11.6 wt% by the EDS. The MPCS-Ti4+ exhibited excellent dispersibility in the aqueous solution, highly affinity selectivity for phosphopeptides and quite fast magnetic separation process within 10 s as well as good reusability. Thus, the prepared magnetic MPCS-Ti4+ nanostructured affinity materials will possess great potential in phosphoproteome research.
    J. Mater. Chem. B. 08/2014;
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    ABSTRACT: The flower-like multifunctional affinity microspheres prepared by a facile solvothermal synthesis and subsequent calcination process consist of magnetic core and hierarchical meso-/macroporous TiO2 shell. The hierarchical porous structure of the flower-like affinity microspheres is constructed by the macroporous shell from the stacked mesoporous nano-petals which are assembled by small crystallites. The affinity microspheres own relatively large specific surface area of 50.45 m2 g-1 and superparamagnetism with a saturation magnetization (Ms) value of 30.1 emu g-1. We further demonstrate that they can be applied for rapid and effective purification of phosphoproteins, in virtue of their selective affinity, porous structure and strong magnetism. In addition, the affinity microspheres can also be used for enrichment of phosphopeptides, and the selectivity is greatly improved due to the increase of mass transport and prevention of the possible "shadow effect" resulting from the smaller and deeper pores by taking advantage of the unique porous structure. Overall, this work will be highly beneficial for future applications in the isolation and identification of phosphorylated biomolecules.
    ACS Applied Materials & Interfaces 03/2013; · 5.90 Impact Factor
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    ABSTRACT: In this paper, we report fabrication and characterization of the luminomagnetic microspheres (denoted as Fe3O4@SiO2–[Eu(DBM)3phen]Cl3). The fluorescent magnetic microspheres were synthesized via preparing Eu(DBM)3phen]Cl3@SiO2–NH2 nanoparticles first by combination of the solvent precipitation method and the Stöber method, followed by grafting the fluorescent nanoparticles onto Fe3O4. The morphological, textural, magnetic and photoluminescence properties were well-characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), superconducting quantum interference device (SQUID), and photoluminescence spectra. The experimental results show that the core–shell structured luminomagnetic microspheres with an average size of ca. 570 nm possessed high magnetization saturation value (61.7 emu/g) with a negligible coercivity and strong red emission peak (614 nm) from 5D0–7F2 transition of Eu3+ ions, indicating that they have potential applications for optical imaging and time-resolved fluorescence spectroscopy.
    Materials Letters. 01/2013; 97:187–190.
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    ABSTRACT: The luminescent complex terbium (III)-trimesic acid (TMA)-1,10-phenanthroline (phen) nanorod was synthesized in the polyvinylpyrrolidone (PVP) matrix by a co-precipitation method. The chemical formula of the synthesized complex was speculated to be PVP/TbL(phen)0.5 x 7H2O by inductively coupled plasma-atomic emission spectroscopy (ICP-AES), elemental analysis and Fourier-transform infrared spectroscopy (FTIR). The X-ray diffraction pattern (XRD) of PVP/TbL(phen)0.5 x 7H2O indicated that it was a crystalline complex. The transmission electron microscopy (TEM) result showed that the complex was nanorods with diameters of about 80-100 nm. The thermogravimetric curve (TGA) analysis exhibited that the complex has good stability below 400 degrees C. UV-Vis diffuse reflectance spectra showed that there is a maximum absorption at 300 nm. The photoluminescence analyses (PLA) showed that the synthesized complex emitted the characteristic green fluorescence of Tb (III) ions under ultraviolet light excitation. The emission peaks of PVP/TbL(phen)0.5 x 7H2O at 488, 542, 581, and 618 nm using 278 nm as exciting wavelength can be assigned to the 5D4 --> 7F6, 5D4 --> 7F5, 5D4 --> 7F4, and 5D4 --> 7F3 electron transitions of the Tb3+ ions, respectively.
    Journal of Nanoscience and Nanotechnology 11/2011; 11(11):9787-90. · 1.15 Impact Factor
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    ABSTRACT: Rare-earth luminescent complex have been attracted increasing interest since they can emit fluorescence using near ultraviolet as excitation wavelength. Nanomaterials have potential applications in optical, electronic, magnetic fields due to their surface effects, volume effects, quantum size effects and macroscopic quantum tunnel effects. Combing the important properties of fluorescence and nanomaterial, the study of nanosized rare earth fluorescence complex is an interesting topic. In this paper, we synthesized ternary luminescence complex nanorods composed of europium (Eu (III))-trimesic acid (H3L)-1,10-phenanthroline (phen) using co-precipitation method in the polyvinylpyrrolidone (PVP) matrix. The elemental analyses of the samples were determined using an Inductively coupled plasma atomic emission spectroscopy (ICP-AES), and the chemical composition PVP/EuL(phen)0.2 5H2O was obtained. The X-ray diffraction (XRD) patterns showed that the resulting nano-sized complex is new substance different from that of two ligands. The transmission electron microscopy (TEM) image indicated that the nano-sized complex was nanorod with the average diameter of about 50 nm. Thermal analysis (TGA) result exhibited that the nano-sized complex is stable under 400 degrees C. UV-Vis diffuse reflectance spectra (DRS) showed that there is the maximum absorption at 260 nm. Photoluminescence analysis (PLA) indicated that the nano-sized complex emits Eu (III) characteristic red luminescence under ultraviolet excitation.
    Journal of Nanoscience and Nanotechnology 11/2010; 10(11):7494-7. · 1.15 Impact Factor
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    ABSTRACT: The nickel hydroxides (β-Ni(OH)2) with different shapes such as hexagonal nanosheets, irregular nanosheets, and nanoparticles were synthesized in the absence of SO42− ions and in the presence of 0.00−3.00 mmol of the added NaOH using a hydrothermal method. The β-Ni(OH)2 phase with brucite-type structure was confirmed by an energy-dispersive spectrum (EDS), Fourier transform infrared spectra (FTIR), and powder X-ray diffraction (XRD). The effect of the free OH− ions and the SO42− ions in the hydrothermal system on morphologies of the Ni(OH)2 products was investigated in detail. In the absence of SO42− ions system, when the added NaOH amount is less than 0.02 mmol, the irregular thin nickel hydroxide nanosheets with thickness of about 20−50 nm were obtained; when the added NaOH amount is between 0.35 and 0.55 mmol, the products have the regular hexagonal morphology with a width of 150−500 nm and thickness of 40−80 nm; while when the added NaOH amount is 1.50−3.00 mmol, the nickel hydroxide products became polyhedral nanoparticles with an average diameter of ca. 50−90 nm. The Ni(SO4)0.3(OH)1.4 nanowires or α-Ni(OH)2 nanowires containing the intercalated SO42− anions can only be obtained in the presence of SO42− ions. They have lengths of several micrometers and widths of 20−30 nm. A possible growth mechanism of the nanosheets, nanoparticles, and nanowires is suggested.
    The Journal of Physical Chemistry C. 06/2010; 114(28):12110–12116.
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    ABSTRACT: The terbium(III)-pyromellitic acid(H4L)-1,10-phenanthroline(phen) luminescent complex was synthesized using a co-precipitation method. The chemical composition of the synthesized complex was speculated to be Tb4L3(phen)0.075·10H2O by elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and Fourier-transform infrared spectroscopy (FT-IR). The X-ray diffraction analytic results indicated that the synthesized complex is a new crystalline complex, whose structure was different from those of other two ligands. The scanning electron microscopy analytic results showed that the product was of spherical crystals with good dispersion property, and the mean diameter of the spheres was about 1-2 μm. The TG-DTA result showed that the complex had good stability below 489 °C. PL spectra showed that the complex emitted characteristic green fluorescence of Tb(III) ion under ultraviolet excitation.
    Journal of Rare Earths 01/2010; 28:47-50. · 1.36 Impact Factor
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    ABSTRACT: A series of novel nanosized amino acid-polyoxometalate compounds were successfully synthesized using a low temperature solid-state chemical reaction method. Their compositions, structures, morphologies, photochromic properties were characterized by ICP-AES/MS, TG/DTA, FTIR, XRD, SEM and UV-Vis diffuse reflectance spectra (DRS), respectively. The elemental analysis results showed that the compounds ((HThr)7PMo12O42•4H2O, (HTyr)7PMo12O42·5H2O, (HSer)7PMo12O42•5H2O and (HGlu)7PMo12O42•4H2O) were obtained. The analyses of the TG/DTA, XRD and FTIR confirmed that the four compounds are new phases different from the corresponding reactants and they are composed of the polyoxometalate anions and the corresponding protonated amino acids, respectively. Observation of the SEM revealed that the particle shape (e.g. (HThr)7PMo12O42·4H2O nanoplates, (HTyr)7PMo12O42•5H2O nanorods, (HSer)7PMo12O42•5H2O and (HGlu)7PMo12O42•4H2O nanoparticles) depended strongly on the structures of amino acids. This implied that the amino acids can play a structural template agent role in synthesis of the Silverton-type polyoxometalate compounds. After irradiated with ultraviolet light, these samples all exhibited photochromism. Their photochromic mechanism may be explained based on Yamase's photochromic model. These photochromic compounds could be applied to the field of photosensitive materials.
    Proc SPIE 07/2009;