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Study on Nano-Ag Particles Synthesized Through PAMAM Bonded on Organic Film Surfaces after Grafted Amino Groups by Plasma Treatment

Author: LiJuan
Tutor: ChenQiang
School: Beijing Institute of Printing
Course: Materials Physics and Chemistry
Keywords: Amine calibration PAMAM dendrimer Nano Silver Antibacterial
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 108
Quote: 0
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Abstract


In this paper, dielectric barrier discharge technology in organic thin film surface graft polymerization of a certain amount of the amine, this film surface the amine for nuclear, synthesis of dendrimers polyamidoamine macromolecular PAMAM template synthesis of metal nano-Ag particles. The subject comprehensive utilization the plasma graft, plasma chemistry, chemical organic synthesis and inorganic reducing many reactions, the synthesis of new materials. Mainly obtained through experiments the following conclusions: (1) the use of dielectric barrier discharge of ammonia, ethylenediamine, propylene amine grafted amine monomer on the surface of the organic thin film processing, the calibration method and trifluoromethyl isothiocyanate The benzaldehyde derivatives Law precise quantitative calibration of surface amine density, respectively, by UV - visible spectrophotometer and X-ray photoelectron spectroscopy, the measurement of the measurement surface amine. The following conclusions are reached, monomers used ammonia on the film surface modified parameters: discharge time 40s, discharge spacing of 2mm, the monomer flow 400ml/min, 4.91 NH2/nm2 amine concentration is obtained under this condition. Parameters when the monomer is acrylamide: 6min discharge time. The amine concentration is 11.55 NH2/nm2; When the monomer used is ethylenediamine, the amine concentration values ??obtained using different film similar to PET as the base amine concentration of about 0.98NH2/nm2. The sample after the measurement sample surface contact angle, the treated surface becomes more hydrophilic. (2) using the divergent method ethylenediamine core, synthetic the different algebraic polyamide - amine dendrimer alternately by Michael addition and amidation reaction. Fourier transform infrared spectrometer, 1H superconducting NMR spectrometer to characterize its structure, further influencing factors of polyamide - amine dendrimer synthesis and discussion. By changing the ratio of the molar concentration of the reactants, temperature, time and other conditions of polyamide - amine dendrimer synthesis of investigated reaction conditions, to optimize the synthesis of polyamide - amine dendrimer conditions, and by comparing the derived ideal synthesis conditions: the concentration ratio of substantially 1:16; reaction temperature 25 ° C; 24 hours of reaction time. Under this condition, to the amine groups of the surface of the film for the nuclear and methacrylate repeated reaction, 1.0 G-5.0 G PAMAM macromolecular synthesis in the film surface; (3) with silver nitrate as raw materials, sodium borohydride as the reducing agent, In the the PAMAM Dendrimer synthesis of organic thin film surface as a template and stabilizers successfully prepared silver nanoparticles. Research Ag / dendrimer molar ratio of dendrimer algebra on the size and content of the synthesis of nano-silver. Silver nanoparticles obtained by UV - visible spectroscopy (UV-visible), optical microscopy, transmission electron microscopy (TEM), EDS, XPS characterization. The obtained silver particle size increases with the increase of the Ag concentration is reduced, while the increase of PAMAM macromolecules algebra. (4) the synthetic film applied research. The method using the zone of inhibition of the antimicrobial properties of the sample is a qualitative testing, antibacterial properties dependent on the concentration of macromolecules algebra and Ag.

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