{'fraction_non_alphanumeric': 0.027433050293925537, 'fraction_numerical': 0.006531678641410843, 'mean_word_length': 5.410041841004184, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Preparation and characterization of antimicrobial microfiltration : PEO / PVDF membranes doped Ag + nanoparticles

Polyvinylidene fluoride (PVDF) is fit membranes material, ultra filtration and microfiltration hollow due to its excellent thermal stability and chemical resistance to aggressive reagents like organic solvents. In our study, PEO/PVDF hollow membranes were prepared with different concentrations of PEO (≤10 wt.%) and 10 wt.% of AgNO3 nanoparticles which have been used in many bactericidal fields by casting solution using alcohol as nonsolvent. The structural, morphology and thermal properties of the membranes were studies by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-/Vis absorption spectroscopy , FT-IR absorption spectra , Differential scanning calorimetry (DSC) and determination of activation energy. The results revealed that the addition of PEO and AgNO3 formed micropores. Pore size and the porosity were decreased with increase of PEO main phases of PVDF and the compatibility with micropores were observed. In addition, the stretching vibration band at 1107cm was disappeared attributed to the specific interaction between the fluorine in PVDF and carbon connected to oxygen of PEO. The intensities of some bands which belonging to γ-phase was increased. This is useful in some technical applications. Moreover, the values of both melting temperature and the degree of crystallinity were decreased with increase of PEO which related to miscibility and homogeneity of the membranes.