Xuewu Ge

University of Science and Technology of China, Luchow, Anhui Sheng, China

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Publications (126)316.86 Total impact

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    ABSTRACT: Bi2WO6 has great potential applications in the field of photocatalyst due to its excellent visible-light photocatalytic performance. This work studied the detailed morphological evolution of Bi2WO6 particles synthesized in a simple hydrothermal system induced by the stabilizer poly (vinyl pyrrolidone) (PVP). The XRD and HRTEM results show PVP won’t change the crystal structure of Bi2WO6, but the distribution of PVP on the initially formed Bi2WO6 nanosheets will induce the crystal growth, resulting in a distinct morphology evolution of Bi2WO6 with the increase of the concentration of PVP. At the same time, with the increase of the molecular weight of PVP, the morphology of Bi2WO6 varied from simple sheet-like (S-BWO) to some complicated morphology, such as flower-like (F-BWO), red blood cell-like (B-BWO), and square-pillar-like (SP-BWO). The photocatalytic performances of Bi2WO6 with various morphologies on the decomposition of RhB under visible light irradiation reveal that S-BWO has the best photocatalytic performance, while SP-BWO has the worst. This work not only gives the explanation of the inductive effect of PVP molecular chains on the morphological formation of Bi2WO6 particles, but also provides the controllable way to the preparation of Bi2WO6 with various morphologies taking advantage of the stabilizer PVP.
    No preview · Article · Feb 2016 · Applied Surface Science
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    ABSTRACT: The preparation of efficient and practical biomacromolecules imprinted polymer materials is still a challenging task due to the spatial hindrance caused by the large size of template and target molecules in the imprinting and recognition process. Herein, we provided a novel pathway to coat a NIR-light responsive lysozyme-imprinted polydopamine (PDA) layer on a fibrous SiO2 (F-SiO2) microsphere grown up from a magnetic Fe3O4 core nanoparticle. The magnetic core-shell structured lysozyme-imprinted Fe3O4@F-SiO2@PDA microspheres (MIP-lysozyme) can be easily separated by a magnet and have a high saturation adsorption capacity of lysozyme of 700 mg/g within 30 min due to the high surface area of 570 m2/g and the mesopore size of 12 nm of the Fe3O4@F-SiO2 support. The MIP-lysozyme microspheres also show an excellent selective adsorption of lysozyme (IF > 4). The binding thermodynamic parameters studied by ITC proves that the lysozyme should be restricted by the well-defined 3D structure of MIP-lysozyme microspheres. The MIP-lysozyme can extract lysozyme efficiently from real egg white. Owing to the efficient NIR light photothermal effect of PDA layer, the MIP-lysozyme microspheres show the controlled release property triggered by NIR laser. The released lysozyme molecules still maintain good bioactivity, which can efficiently decompose E. coli. Therefore, this work provides a novel strategy to build practical NIR-light-responsive MIPs for the extraction and application of biomacromolecules.
    No preview · Article · Dec 2015 · ACS Applied Materials & Interfaces
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    ABSTRACT: The preparation of highly crosslinked polymer microspheres through the polymerization reaction in an alcohol-water solution without any stabilizer is still a difficult task. Here, we first reported a facile preparation of monodispersed highly-crosslinked microspheres through the polymerization of ethyleneglycol dimethacrylate (EGDMA) in an alcohol-water solution in the presence of a small amount of hydrophilic comonomer with a high reactivity ratio in a sealed autoclave at above the boiling point of the solvent, which can be considered as a solvothermal precipitation polymerization process. The formation mechanism of the poly(ethyleneglycol dimethacrylate) (PEGDMA)-based microspheres involving an initial nucleation process and the grow process of the microspheres was proposed and confirmed by the composition and distribution of the hydrophilic comonomer in the oligomers and microspheres, which were analyzed by 1H and 13C CP-MAS solid NMR spectra, elemental mapping, and XPS. This work opens a new economic and environmental-friendly way to prepare highly-crosslinked functional PEGDMA-based microspheres.
    No preview · Article · Dec 2015
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    ABSTRACT: The combination of NIR photothermal therapy and chemotherapy is considered as the promising technique for future cancer therapy. The key point of this technique is the design and synthesis of photothermal agents with high-efficiency photothermal effects and high chemical drug loading capacity. Herein, submicron-sized raspberry-like hollow-structured polypyrrole microspheres (H-PPy) were facilely prepared through in situ polymerization of pyrrole on monodispersed polystyrene (PS) template microspheres with a diameter of 220 nm, followed by the chemical etching of PS templates. The prepared H-PPy microspheres show rapid and remarkable photothermal effects in water under NIR laser irradiation (808 nm) only for 5 min. Further, a model small molecular drug, (S)-(+)-camptothecin (CPT), was loaded into the void core by a simple dispersion–permeation process through the micro-pores on the raspberry-like PPy shell, with a loading capacity of 0.14 mg/(mg H-PPy). The MTT assay and the in vitro NIR-laser triggered release behavior indicated that pure H-PPy microspheres have good biosafety, but the release of loaded CPT into H-PPy microspheres can be achieved with remarkable spatial/temporal resolution after NIR laser irradiation, which results in excellent synergistic effect of photothermal and chemical ablation on HeLa cells, as proved by fluorescence microscopy. This work provides convenient synthesis of a promising cancer therapy agent with high drug-loading capacity and efficient NIR light photothermal effects, which can perfectly achieve the synergistic NIR photothermal therapy and chemotherapy of PPy microspheres.
    No preview · Article · Nov 2015 · Journal of Materials Chemistry B
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    ABSTRACT: Although RAFT polymerization in a homogeneous system has been widely studied, RAFT mediated polymerization on a solid–liquid surface has rarely been mentioned. In this work, a two-step consecutive RAFT polymerization of methyl methacrylate (MMA) and acrylic acid (AA) on the sulfonated polystyrene (SPS) microspheres dispersed in water was achieved under γ-ray radiation. As a result, poly(acrylic acid) (PAA)-grafted cagelike porous SPS/PMMA microspheres with distinct pH-responsive release properties have been fabricated. The RAFT mediated polymerization on the surface of porous microspheres has been discussed in detail based on the 1H NMR spectra combined with the 2D 1H–13C heteronuclear singular quantum correlation (HSQC) spectra. This work not only enriches the mechanism of heterogeneous surficial RAFT polymerization, but also indicates that γ-ray radiation induced RAFT mediated polymerization on a solid–liquid surface should be a practical technique for the fabrication of porous materials with subtle controllable surface properties.
    No preview · Article · Sep 2015 · Polymer Chemistry
  • Yunyun Xie · Jie Wang · Mozhen Wang · Xuewu Ge
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    ABSTRACT: Fibrous cyano-modified mesoporous SiO2 microspheres with specific surface area of ca. 300m(2)g(-1) have been successfully fabricated respectively by in-situ synthesis and post-modification methods, based on the hydrolysis of ethyl silicate in the presence of (2-cyanoethyl)triethoxysilane at a certain condition. TEM observations show that the average diameters of the prepared fibrous cyano-modified SiO2 microspheres by these two methods are 68 and 211nm, respectively. The N2 adsorption-desorption isotherms analysis on the fibrous SiO2 microspheres show sharp peaks in the 10-20nm range. After the cyano groups transformed to amidoxime groups, the adsorption behavior of the fibrous amidoxime-functionalized mesoporous SiO2 microspheres for Fe(3+), Cu(2+), and Pb(2+) was investigated. The results show that the prepared SiO2 microspheres can selectively adsorb Pb(2+). The maximum equilibrium adsorption capacity for Pb(2+) could reach 284mg/g. The desorption of Pb(2+) in 2M HNO3 completes within 60min. The efficiency of the desorption is as high as 96.2%. This work provides the methods to prepare amidoxime-functionalized SiO2 microsphere with high specific surface area and total pore volume, which has the potential to be applied as an efficient adsorbent for specific heavy metal ions. Copyright © 2015. Published by Elsevier B.V.
    No preview · Article · Apr 2015 · Journal of hazardous materials
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    ABSTRACT: The preparation of super-toughening poly(ethylene terephthalate) (PET) blends has always been a practical and valuable task. In our work, PET resins grafted with poly(acrylic acid) (PAA), termed as PET-g-PAA, were firstly prepared through γ-ray radiation induced graft polymerization, and blended in a partially miscible PET/ethylene-methyl acrylate-glycidyl methacrylate random terpolymer (ST2000) system as the compatibilizer. The impact strength of the PET blends achieves the maximum at a 6 wt% of PET-g-PAA, but without the loss of tensile strength. Furthermore, much less of ST2000 is needed for the blends to possess high impact strength at the existence of PET-g-PAA. The SEM morphological analysis of the impact-fracture surface implies a good interfacial adhesion between ST2000 and PET matrix, which should be ascribed to the effective compatibilization by the in-situ formed PET-g-PAA/ST2000 graft copolymer through the reaction between the -COOH groups and epoxy groups on ST2000.
    No preview · Article · Apr 2015 · Industrial & Engineering Chemistry Research
  • Source
    Lechen Chen · Lizhao Xie · Mozhen Wang · Xuewu Ge
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    ABSTRACT: Three-dimensional inverse opal SnO2/graphene (IO-SnO2/graphene) microspheres with a size of several tens of microns are first prepared by a well-designed two-step calcination of polystyrene (PS) colloidal crystal template balls infiltrated with the sol precursors of SnO2 and graphene oxide. The polystyrene colloidal crystal template balls are formed by the self-assembly of monodispersed PS microspheres confined in water droplets of an inverse emulsion induced by the slow evaporation of water. Characterization with scanning electronic microscopy, Raman spectra, X-ray diffraction and X-ray photoelectron spectroscopy proved the ordered macroporous inverse opal composed of crystalline SnO2 and in situ reduced GO during the calcination. The pore size depends on the PS microspheres. The UV-vis diffusive reflectance spectra show that the light absorption edge of the prepared IO-SnO2/graphene microspheres can shift more than 400 nm. The photoluminescence spectra indicates that the IO structure and the introduction of rGO make the charge carriers transfer fast and retard the hole/electron recombination in the IO-SnO2/graphene microspheres so that their photocatalytic performance on the UV photolysis of methyl orange is considerably better than that of commercial SnO2 nanoparticles. However, the photocatalytic performance also depends on the content of GO. The addition of 0.06 wt% of GO achieves the best photocatalytic effect. Excessive GO will result in a diminished catalytic activity. This work provides a way to fabricate a new morphological SnO2 based materials with enhanced photocatalytic activity, which helps in the exploration of new photocatalysts with high performance.
    Preview · Article · Jan 2015
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    ABSTRACT: Poly(ethylene terephthalate)-g-polyacrylonitrile (PET-g-PAN) composite film with a porous surface was fabricated via gamma-ray-radiation-induced graft polymerization on PET film in an aqueous solution system. The original PET film was first irradiated by gamma ray in the aqueous solution of acrylic acid. Next, the graft polymerization of acrylonitrile (AN) was induced by gamma ray on the surface of the above modified PET film in an aqueous solution of AN. The prepared PET-g-PAN composite film has a smaller static water contact angle than the original PET film. The SEM and AFM images show that the grafted PAN layer on the surface of PET-g-PAN composite film is composed of closely-arranged spherical PAN microspheres with an average diameter of 30 nm. The gaps between the PAN microspheres form fine pores (less than 30 nm) on the surface. The gas barrier property of the PET-g-PAN composite film is much better than that of the original PET film. This work provides a facile and green method to prepare PET-g-PAN composite film with a controllable porous surface morphology by taking advantage of the radiation-induced graft polymerization technique in an aqueous solution system.
    No preview · Article · Jan 2015 · Radiation Physics and Chemistry
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    ABSTRACT: A core–shell structured chitosan (CS)-based gene vector with a sustainable gene transfection effect was designed and successfully prepared in this study. The pEGFP was first combined with the thiolated and N-alkylated chitosan (TACS). Then, hydroxybutyl chitosan grafted with poly(ethylene glycol) (EG–HBC) was coated on the pEGFP-loaded TACS particles. The prepared pEGFP-loaded TACS@EG–HBC particles have a size of about 200 nm and little cytotoxicity. The in vitro and in vivo gene transfection experiments indicate that the pEGFP-loaded TACS@EG–HBC particles possess a better sustainable gene transfection capacity and a high transfection efficiency, which should be attributed to the biodegradation of the CS-based shell, the thiolation and N-alkylation modification on CS cores, and the grafted PEG chains with better biocompatibility. The in vivo gene expression of the loaded pEGFP can persist up to 60 days. This novel gene vector has a theoretical and practical significance for gene therapy with sustained transfection effect.
    No preview · Article · Jan 2015 · Journal of Materials Chemistry B
  • Yunlong Wang · Mozhen Wang · Xuewu Ge
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    ABSTRACT: Three-dimensionally ordered macroporous (3DOM) polytetrafluoroethylene (PTFE) has hardly been prepared due to the poor solubility in most of solvents and high melting temperature of PTFE raw material. In this work, monodispersed polystyrene (PS) microspheres and PTFE latex particles were controlled to simultaneously deposit from water. After the deposits were calcinated at 400 oC, a self-supported superhydrophobic 3DOM PTFE film with a static water contact angle of 154° was successfully fabricated. The pore size can be tunable from 1.5 μm to 3 μm, depending on the size of PS microspheres. The prepared 3DOM PTFE film were used as micro-molds and micro-reactors to prepare poly(methyl methacrylate) (PMMA) particles and TiO2 macroporous material, respectively. This work provides a facile method to fabricate 3DOM PTFE materials.
    No preview · Article · Sep 2014 · Langmuir
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    ABSTRACT: Four kinds of 13C-labeled polyacrylonitrile (PAN) samples were prepared respectively by solution polymerization of acrylonitrile (AN) with selective 13C labeling of different molecular sites. The composition and structure of the residues from the thermal treatment of PAN in argon at 250 and 350 °C were quantitatively analyzed in detail by one- and two-dimensional solid-state 13C nuclear magnetic resonance (ssNMR) experiments. Compared with the NMR spectrum of each labeled carbon in AN monomer unit, nine chemical structures created during the heat treatment process have been identified accurately. On this basis, four reaction routes were proposed. It is noted that the main chemical change for PAN started from a cyclization reaction at a relatively low temperature, then experienced an aromazation reaction to form a molecular chain basically composed of isolated pyridine units, instead of the commonly reported ladder structure. This work also shows that the combination of selectively 13C-labeled technique and a high spinning speed of 20 kHz in magic-angle spinning (MAS) NMR experiment could improve the detection sensitivity to nearly 2 orders of magnitude, and provide a clear ssNMR spectra with little peak overlaps, which will be helpful to discover the complex reaction mechanism in the manufacture of carbon fibers with high performance.
    No preview · Article · Jun 2014 · Macromolecules
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    ABSTRACT: A strand displacement reaction-based system was developed for the determination of adenosine triphosphate (ATP). It involved an entropy-driven catalytic cycle that directly employed the ATP aptamer as the catalyst. Introduction of ATP into the system induced the catalyst to form the G-quadruplex conformation and inhibited its catalytic activity. All intermediates in the catalytic cycle processes were identified by polyacrylamide gel electrophoresis analysis. When the oligonucleotides were labeled with a carboxyfluorescein fluorophore and a 4-([4-(dimethylamino)phenyl]azo)benzoic acid quencher, this strand displacement reaction-based catalytic system exhibited a “switch-on” response for ATP. Conditions for detecting ATP, such as the toehold length, concentrations of the catalyst and magnesium ion, and incubation temperature, were optimized to obtain a detection limit of 50 nM and a linear response up to 1400 nM of ATP. This target inhibited catalytic cycle provides an enzyme-free biosensing strategy and has potential application in aptamer-based biosensing.
    No preview · Article · Feb 2014 · Analytical Letters
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    ABSTRACT: A strand displacement reaction (SDR) system that runs solely on oligonucleotides has been developed for the amplification detection of adenosine triphosphate (ATP). It involves a target-induced SDR and an entropy-driven catalytic cycle of two SDRs with five oligonucleotides, denoted as substrate, fuel, catalyst, C-1, and C-2. Catalyst, released from the ATP aptamer–catalyst duplex by ATP molecule, catalyzes the SDRs to finally form the substrate–fuel duplex. All of the intermediates in the catalytic SDR processes have been identified by polyacrylamide gel electrophoresis (PAGE) analysis. The introduction of ATP into the SDR system will induce the ATP aptamer to form G-quadruplex conformation so as to release catalyst and trigger the SDR cycle. When the substrate and C-2 oligonucleotides were labeled with a carboxyfluorescein (FAM) fluorophore and a 4-([4-(dimethylamino)phenyl]azo)benzoic acid (DABCYL) quencher, this SDR catalytic system exhibited a “turn-on” response for ATP. The condition for detecting ATP, such as Mg2+ concentration, has been optimized to afford a detection limit of 20 nM. This work provides an enzyme-free biosensing strategy and has potential application in aptamer-based biosensing.
    No preview · Article · Feb 2014 · Analytical Biochemistry
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    ABSTRACT: This work presents a synthesis of submicron-sized raspberry-like hollow microspheres loaded with corrosion inhibitor (1H-benzotriazole (BTA)) through a multi-stage emulsion polymerization. The combination of hierarchical raspberry-like surface structure and loading of BTA makes the prepared microspheres have good corrosion resistance. When BTA-loaded raspberry-like hollow microspheres are embedded in a water-borne polyurethane film, the obtained composite film can protect the copper from corrosion both in acidic and alkaline corrosive solutions.
    No preview · Article · Jan 2014 · Surface and Coatings Technology
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    ABSTRACT: In this report, we study the formation mechanism of cage-like polymer microspheres fabricated conveniently and efficiently through a swelling-osmosis process of sulfonated polystyrene (SPS) microspheres in a ternary mixed solvent (water/ethanol/heptane). The SEM and TEM observations indicated that the morphology of the final cage-like SPS microspheres is mainly controlled by the composition of the mixed solvent and the swelling temperature. Considering the solubility parameters of related reagents and the low interface tension of heptane and the aqueous solution of ethanol (only 6.9 mN/m), we confirm that the porogen procedure starts from the swelling of SPS microspheres by heptane, followed by the osmosis process of water molecules into the swollen SPS microspheres forced by the strong hydrophilicity of -SO3H group. The water molecules permeated into SPS microspheres will aggregate into water pools, which form the pores after the microspheres are dried. These prepared cage-like SPS microspheres are further served as scaffold for the in situ generated CdS nanoparticles under -ray radiation. The CdS/SPS composite microspheres show great fluorescence performance. This work shows that the cage-like SPS microspheres have a wide industrial application prospect due to their economical and efficient preparation and loading nanoparticles.
    No preview · Article · Nov 2013 · Langmuir
  • Bingxin Li · Yongfei Xu · Mozhen Wang · Xuewu Ge
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    ABSTRACT: In this work, we first reported that the phase separation can take place both inside and outside of a multi-hollow-structured crosslinked seed microspheres swollen by styrene monomers in water during the radiation-induced seeded emulsion polymerization. The phase separation process in these two opposite directions will determine the morphology of final latex particles. First, sulfonated crosslinked polystyrene (SCPS) seed microspheres were swollen by styrene in water. Water will permeate into the SCPS seed microspheres during the swelling process, forced by the osmotic pressure produced by the strong hydrophilicity of the sulfonic acid groups. New aqueous phases are created and stabilized by the hydrophilic -SO3H groups, resulting in a multi-hollow structure of swollen SCPS seed microspheres. When the polymerization of styrene is induced by 60Co -ray radiation, the phase separation of newly-formed polystyrene phase will occur at the seed microsphere-water interface inside and/or outside of the SCPS seed microspheres through adjusting the diameter of seed microsphere, the content of crosslink agent, and the sulfonation degree of SCPS seed microspheres. As a result, SCPS latex particles with a variety of special morphologies, such as spherical multi-hollow, plum-like, and walnut-like latex particles were obtained. The results of this study provide not only a simple and interesting way to design and synthesize multi-hollow polymer latex particles with controllable surface morphologies, but also a better understanding on phase separation mechanism during the swelling and polymerization of monomers in crosslinked amphiphilic polymer networks.
    No preview · Article · Nov 2013 · Langmuir
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    ABSTRACT: The adsorption of DNAs in G-quadruplex solution onto 13nm gold nanoparticles (AuNPs) was studied through monitoring of the localized surface plasmon resonance (LSPR) absorbance of 13nm AuNPs at 520 and 650nm (A650/A520) in the solutions of three widely studied guanine-rich sequences, TBA(5'-GGTTGGTGTGGTTGG-3'), PW17(5'-GGGTAGGGCGGGTTGGG-3'), and PSO (5'-GGGTTAGGGTTAGGGTTAGGG-3'). It was found that the degree of adsorption of DNAs in Pb(2+) stabilized G-quadruplex (G-Pb(2+)) solutions is up to 93% after more than 5h of incubation. Furthermore, the lead concentrations in the solutions containing G-quadruplex and AuNP were analyzed by an inductively coupled plasma atomic emission spectrometer. The results showed that Pb(2+) had been released from the G-quadruplexes, which means the G-quadruplexes may be unfolded in the presence of AuNP. This interaction between G-quadruplexes and AuNP demonstrated that long time incubation between DNAs and AuNPs would possibly make it unable to distinguish G-quadruplex from ssDNA. Thus, a biosensing system consisting of PW17 and AuNPs was developed to detect Pb(2+). It was found that the LSPR responses at A650/A520 were sensitive to [Pb(2+)]. However, the sensitivity of the system was interfered by the potential unfolding of PW17-Pb(2+) in the presence of AuNPs. This unexpected adverse effect of AuNPs on DNA-based biosensors should be taken into consideration in the future development of biosensing systems that are based on ssDNA aptamers and unmodified AuNPs.
    No preview · Article · Oct 2013 · Biosensors & Bioelectronics
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    ABSTRACT: A newly designed functionalization type for gold nanoparticles (AuNP) with split aptamer has been developed for the detection of adenosine triphosphate (ATP). The ATP aptamer was split into two parts with their 5′ prime or 3′ prime modified with thiol. Both the 5′ SH and 3′ SH modified strands for each split aptamer fragment were functionalized onto the same AuNP to construct double-functionalized AuNP–DNA conjugates. Thus, the split aptamer can be reassembled into intact folded structure in the presence of ATP molecule with two potential assembly types, which induces the assembly of AuNP–DNA conjugates. In this double-functionalized system, the traditional assembly type might facilitate another assembly type, which was found to give much higher LSPR change in the presence of ATP than the traditional assembly type, and improve the sensitivity for ATP detection. Time courses of the assemble processes with different assembly types, Mg2+ concentrations, and aptamer fragments densities on AuNP were followed using the absorption ratio at 650 nm and 520 nm. ATP response with this newly designed system was investigated using absorption spectra and dynamic light scattering method.
    No preview · Article · Oct 2013 · Talanta
  • Source
    Yongfei Xu · Xueping Ge · Xiang ji · Mozhen Wang · Xuewu Ge
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    ABSTRACT: Novel golf-ball-like polystyrene (PS) microspheres were obtained through gamma-ray-radiation-initiated polymerization of styrene (St) monomers in a Pickering emulsion stabilized by amphiphilic snowman-like PS Janus microspheres, which were synthesized via seed emulsion polymerization of St swollen in poly(acrylic acid)-functionalized crosslinked PS (PA-CPS) seed microspheres. It was found that the stability of the Pickering emulsion and the hole size of the golf-ball-like PS microspheres depend on the geometry of the amphiphilic snowman-like PS Janus microspheres, which can be tuned by the weight ratio of the styrene monomer to PA-CPS seed microspheres (WS-CPS). This work provides a simple strategy to synthesize amphiplailic Janus microspheres and opens a new way to prepare polymer microspheres with holes on the surface.
    Full-text · Article · Sep 2013 · Chemistry Letters

Publication Stats

2k Citations
316.86 Total Impact Points

Institutions

  • 1997-2015
    • University of Science and Technology of China
      • Department of Polymer Science and Engineering
      Luchow, Anhui Sheng, China
  • 2012-2014
    • USTC-CityU Joint Advanced Research Center
      Hong Kong, Hong Kong
  • 1999
    • Nankai University
      • Department of Chemistry
      T’ien-ching-shih, Tianjin Shi, China