Paper

• 2010
• 2009
• 2008
• 2007
• Before 2007

Representative Papers

Abstract: A simple method for fabricating environmentally stable superhydrophilic wool fabrics is reported here. An ultrathin silica layer coated on the wool altered both the surface roughness and the surface energy of the fiber and endowed the wool fabrics with excellent water absorption. The process of coating silica sols was dependent on an acid solution of low pH, which influenced the electrostatic interactions between nanoparticles and wool fibers. The morphology and composition of silica-sol-coated wool fabrics were characterized by a combination of SEM, TEM, EDX, FTIR, and XPS measurements. The possible mechanism and size effect of silica nanoparticles on the hydrophilic property of wool fabric were discussed. The washing fastness of the superhydrophilic wool fabrics in perchlorethylene and water was alsoevaluated. This study shows that wool fabrics modified by optical transparence, hemical stability, and nontoxic silica sols are promising in constructing smart textiles.

Abstract: A practical glucose biosensor was developed by combining the intrinsic peroxidase-like activity of Fe3O4 nanoparticles (Fe3O4 NPs) and the anti-interference ability of the nafion film. Glucose oxidase (GOD) was simply mixed with Fe3O4 NPs and cross-linked on the Pt electrode with chitosan (Cs) medium by glutaraldehyde, and then covered with a thin nafion film. The biosensor showed high sensitivity (11.54μAcm−2mM−1), low detection limit (6×10−6 M), and good storage stability. A linear calibration plot was obtained in the wide concentration range from 6×10−6 to 2.2×10−3 M. The modified electrode could virtually eliminate the interference during the detection of glucose. Furthermore, the biosensor was successfully applied to detect glucose in human serum sample. This fabrication of glucose biosensor was of considerable interest due to its promise for simple procedure and optimizing conditions in practical application
　

Abstract: The interaction between nanoparticles (NPs) and cells has been studied extensively, but the effect of particle shape on cell behavior has received little attention. Herein three different shaped monodisperse mesoporous silica nanoparticles (MSNs) of similar particle diameter, chemical composition and surface charge but with different aspect ratios (ARs, 1, 2, 4) were specially designed. Then the effects of particle shape of these three different shaped particles on cellular uptake and behavior were studied. The results indicated that these different shaped particles were readily internalized in A375 human melanoma (A375) cells by nonspecific cellular uptake. Particles with larger ARs were taken up in larger amounts and had faster internalization rates. Likewise, it was also found that particles with larger ARs had a greater impact on different aspects of cellular function including cell proliferation, apoptosis, cytoskeleton formation, adhesion and migration. These results show that nanoparticles should no longer be viewed as simple carriers for biomedical applications, but can also play an active role in mediating biological effects. Therefore, our findings may provide useful information for the development of new strategies for the design of efficient drug delivery nanocarriers and therapeutic systems and provide insights into nanotoxicity.

Dong Chen, Linlin Li, Fangqiong Tang, Shuo Qi

Abstract: Silica nanorattles are fabricated by means of selective etching of ingeniously designed organic-inorganic hybrid silica spheres with a three-layer sandwich structure. The size (95-645 nm), shell thickness, and core diameter of the monodisperse nanorattles can be precisely controlled, even in gram-scale production. This method is also shown to be promising for development as a general method for synthesis of rattle-type functional nanomaterials.
　

Bo Peng, Zhengtao Deng, Fangqiong Tang, Dong Chen, Xiangling Ren and Jun Ren

Abstract: Challenges are emerging that demand facile approaches to control the self-assembly of nanocrystal morphology-specific higher-order architectures. Herein, we show a novel reversible wet-chemical approach to control the self-assembly of ZnS nanocrystals into well-defined, uniform, three-dimensional, aspect-ratio-tuned, micrometer-scale, self-healing architectures, which resemble chloroplast in shape. We can control the aspect ratio and the chemical potential of the 3D chloroplast-shaped architectures by adjusting the concentration of ammonia and the ratio of S2−ions to Zn²⁺ ions. Possible mechanism of the controllable self-assembly is proposed. This self-assembly concept can also be applicable to a wide range of other transition-metal sulfide chloroplast-shaped architectures, such as CdS, CuS, and Ag2S.The present study could open a new avenue to understand the important nanocrystal self-assembly phenomenon.

Zhengtao Deng, Yun Zhang, Jiachang Yue, Fangqiong Tang, and Qun Wei

Abstract:One of the most highlighted and fastest moving interfaces of anotechnology is the application of quantum dots (QDs) in biology. The unparalleled advantages of the size-tunable fluorescent emission and the simultaneous excitation at a single avelength make QDs the great possibility for use in optical encoding detection. In this paper, we report that green and orange CdTe QDs as convenient, cheap, reversible, and effective pH-sensitive fluorescent probes could monitor the proton (H+) flux driven by ATP synthesis for dual simultaneous and independent detection of viruses on the basis of antibody-antigen reactions. A new kind of biosensor (consisting of the mixture of green-QDs-labeled chromatophores and orange-QDs-labeled chromatophores) fluorescent measurement system was established for rapid, simultaneous, and independent detection of two different kinds of viruses (i.e., H9 avian influenza virus and MHV68 virus). It is crucial to find that the green and orange QDs labeled biosensors coexisting in the detection system can work independently and do not interfere with each another in the fluorescence assays. In addition, a primary steady electric double layer (EDL) model for the QDs biosensors was proposed to illustrate the mechanism of simultaneous and independent detection of the biosensors. We believe that the pH-sensitive CdTe QDs based detection system, described in this paper, is an important step toward optical encoding and has a great potential for simultaneous and independent qualitative and quantitative multiple detection systems.
　

Abstract: A mixed-solvent method was developed to coat polystyrene (PS) spheres with smooth, homogeneous shells of amorphous titania by ammonia catalysis. The TEM images showed that, in the presence of ammonia, the thickness of titania shells could be controlled in the range of 8-65 nm by varying the concentration of titanium tetrabutoxide (TBOT) in the ethanol/acetonitrile mixed solvents with an appropriate volume ratio. The diffusion-controlled mechanism of the mixed solvents and the catalysis mechanism of ammonia were investigated. After the calcination of core-shell particles for 2 h at 500 ℃, spherical hollow titania shells could be obtained, and the surfaces of the particles remained quite smooth and homogeneous. TheXRDanalysis indicated that calcination promoted the transformation of amorphous titania into an anatase phase

Zhengtao Deng, Li Cao, Fangqiong Tang, and Bingsuo Zou

Abstract: We report the possible mechanism of forming of CdSe nanocrystals in the high boiling point solvents with long alkane chains and a novel Non-TOP-Based route to zinc-blende CdSe nanocrystals. A new mechanism shows that there exits a redox reaction in the long alkane chain solvents: Se is reduced to H2Se gas; at the same time, the long alkane chains are oxidated to alkene chains; then, the Cd complex reacts with H2Se to form CdSe nanocrystals. Possible chemical reaction equations involved in the process of forming the CdSe nanocrystals have been discussed. The alkene chain and H2Se were detected respectively by a series of experiments to support the new mechanism. Under the guidance of this mechanism, we have developed a much cheaper and greener Non-TOP-Based route for the synthesis of a size series of high-quality zinc-blende (cubic) CdSe nanocrystals. Low-cost, green, and environmentally friendlier reagents are used, without use of expensive solvents such as trioctylphosphine (TOP) or tributylphosphine (TBP). The new route enables us to achieve high-quality CdSe nanocrystals with sharp ultraviolet and visible (UV-vis) absorption peaks, controllable size (2.0-5.0 nm), bright photoluminescence (PL), narrow PL full width of half-maximum (fwhm) (29-48 nm), and high PL quantum yield (up to 60%) without any size sorting.
　

Huang, Zhongbing; Tang, Fangqiong

Abstract: A novel method of fabricating core–shell structure particles, comprising nearly monodisperse polystyrene (PS) spheres as cores and Fe₃O₄ as shells, is submitted. In this research, the magnetite (Fe₃O₄) shell was prepared by seeded growth from the reaction of FeCl₂ with diethylene glycol (DEG) in aqueous solutions. The thickness of the shell were controlled in the range of 0–60 nm by using slow injection. The composition and the structure of the shell were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermogravimetric analysis (TG), and vibrating-sample magnetometry (VSM). It is found that there are some differences between the magnetic composite spheres shelled with Fe₃O₄ and pure Fe₃O₄ particles, such as the size of the magnetites and the ferromagnetic property. Furthermore, the spheres exhibited the superparamagnetic characterization when the thickness of the Fe₃O₄ shell was less than 15 nm.

Laboratory of Controllable Preparation and Application of Nanomaterials

Technical Institute of Physics and Chemistry of CAS

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