Author
Y.Q. Dai
Bio: Y.Q. Dai is an academic researcher from Wuhan University. The author has contributed to research in topics: Vacancy defect & Nuclear engineering. The author has an hindex of 2, co-authored 2 publications receiving 42 citations.
Papers
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TL;DR: In this paper, the positron lifetime spectroscopy (PAS) and the coincident Doppler broadening (CDB) technique were combined to identify Ca vacancy (V-Ga) related defects by combining the CDB measurements.
29 citations
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TL;DR: In this article, the free volume properties, structural transition and miscibility behavior of segmented copolymer poly(ethylene oxide) poly(polyethylene terephthalate) (PEO/PET) as a function of the hard segment content (PET) and the temperature were investigated.
15 citations
Cited by
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TL;DR: In this paper, the free volume and water vapor permeability of polyurethane (SPU) membrane were investigated using wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM) techniques.
107 citations
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TL;DR: In this paper, a silver-polycarbonate (Ag-PC) matrix was prepared by a g-radiation-assisted diffusion method, and its antibacterial properties were studied.
Abstract: A silver–polycarbonate (Ag–PC) matrix was prepared by a g-radiation-assisted diffusion method, and its antibacterial properties were studied. Rutherford backscattering spectroscopy, X-ray diffraction, and transmission electron microscopy results showed the diffusion of good, crystalline-structured (face-centered cubic) silver nanoparticles (AgNPs) inside polycarbonate (PC) after irradiation. Ultraviolet–visible spectroscopic results indicated a blueshift in the surface plasmon resonance of the AgNPs; this revealed a particle size decrease with increasing g-radiation dose. This was also supported by the scanning electron microscopy results. The microstructure of the pristine PC and silver-doped PC was monitored with positron annihilation spectroscopy, and it showed decreases in the free-volume hole size and fractional free-volume for Ag–PC and g-ray-irradiated PC. This corroborated the Doppler broadening spectroscopy results. The thermal degradation temperature of PC was increased because of the diffusion of AgNPs in PC. The antibacterial activity of the synthesized Ag–PC matrix was evaluated by the zone of inhibition, and the results demonstrated its bacterial growth inhibition ability. The results indicate the potential to produce an Ag–PC matrix for various applications in medical and food industries. VC 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43729.
90 citations
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TL;DR: In this article, two segmented thermo-sensitive polyurethane (TSPU) membranes with functional gates were synthesized and used for water vapor controllable permeation.
62 citations
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TL;DR: In this paper, a series of blend films from cellulose acetate (CA) and castor oil-based polyurethane (PU) were prepared, and the properties of such blend films were investigated by wide-angle X-ray diffraction (WXRD), infrared, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), positron annihilation lifetime spectroscopy (PALS), thermogravimetric analysis and tensile test.
54 citations
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TL;DR: In this article, the effect of physical aging and side group on the free volume has been studied by positron annihilation lifetime spectroscopy (PALS) and differential scanning calorimeter (DSC).
46 citations