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RISS 인기검색어
- 검색키워드
- 저자 : Zahra Moridi Mahdieh (검색결과 3 건)
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Zahra Moridi Mahdieh,Shahla Shekarriz,Faramarz Afshar Taromi 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1
In situ synthesis coating method of textile fabric is an efficient strategy to reduce the time and energies incomparison with ex situ synthesis methods. A facile in situ synthesis method was used to make TiO2-Ag nanoparticles (NPs)coated fabric and compared with a traditional ex situ synthesis method by a photo-reduction approach. The effect of silverconcentration was assessed for both methods. The corona discharge treatment was used to increase the adhesion of thecoating to the surface of the fabric. The FESEM and map showed more even distribution of the TiO2-Ag NPs coated fabricfor in situ method in comparison with ex situ. DLS analysis was employed for determining the average particle size of theNPs colloids and show the fewer colloids average size of the in situ method than ex situ. The elemental analysis of the EDSand ICP showed a significant efficiency of the in situ synthesis method for silver nitrate reduction that leads to an increase inthe nanoparticles concentration on the surface. Self-cleaning and antibacterial activity have been increased by in situsynthesis coating method in comparison with ex situ method. The enhancement of silver nitrate concentration led to aconsiderable increase in silver content for in situ method in comparison with ex situ method. However, the self-cleaningimprovement showed a critical concentration at silver nitrate of 0.005 w/v%. The wash durability of the coated fabricsshowed a significant increase in durability for in situ synthesis. The measurement of the mechanical strength of the fabricsshowed no significant change with both methods of coating.
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Conductive chitosan/multi walled carbon nanotubes electrospun nanofiber feasibility
Zahra Moridi Mahdieh,Akbar Khodaparast Haghi,Vahid Mottaghitalab,Negin Piri 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.1
The current study focuses on the electrospinning of chitosan (CHT)/multi walled carbon nanotubes (MWNTs)composite nanofiber using a highly stable dispersion. The acetic acid (1-100%) and trifluoroacetic acid/dichloromethane (TFA/DCM 70 : 30) was tested as solvent, and the TFA/DCM (70 : 30) is most preferred for fiber formation process with acceptable electrospinnability. Moreover, a new protocol was used to establish proper technique for preparation of electrospinning solution. FT-IR spectroscopy utilized to infer the extent of interaction between CHT polymer chain and MWNT filaments. A quite simple technique was employed to show the stability of electrospinning solution before nanofiber formation process. Scanning electronic microscope (SEM) was employed to show the influence of spinning parameters on surface morphology of electrospun fiber. Under optimized condition, homogeneous and beadfree CHT/MWNTs nanofibers and known physical characteristics were prepared. The formation of conducting nanofibers based on CHT nanocomposites can be considered as a significant improvement in electrospinning of CHT/CNT dispersion. The direct outcome of the current study includes the homogeneous CHT/MWNTs nanofibers with an average diameter of 275 nm and a conductivity of 9×10−5 S/cm. These results are extremely important for further investigation regarding biomedical applications.
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Fatemeh Emami,Shahla Shekarriz,Zahra Shariatinia,Zahra Moridi Mahdieh 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5
Nylon 6 fabric with self-cleaning properties was prepared by corona discharge pre-treatment and coating with TiO2 nanoparticles (NPs) using pad-dry-cure technique. The self-cleaning property was studied by discoloration of methylene blue (MB), ketchup, tea and coffee stains from the corona+TiO2 treated nylon-6 fabric. Color difference (ΔΕ*), reflectance (R) and K/S of MB stain were investigated by diffuse reflectance spectrophotometry. The MB stain was almost completely removed from the corona+TiO2 treated nylon surface after 24 h under UV light/daylight irradiation. Both of these phenomena (corona and TiO2) led to an increase in the discoloration of stains under UV and daylight irradiations. The EDS analysis showed an increase in the concentration of deposited TiO2 NPs coating after corona treatment. The FE-SEM images revealed that the surface of nylon 6 was coarser after the corona treatment. Also, the FE-SEM micrographs exhibited that a uniform layer of TiO2 NPs was formed on the corona treated nylon fabric. The corona+TiO2 treated nylon illustrated antibacterial activity against E. coli and B. subtillis microorganisms. The EDS and FE-SEM analysis confirmed that after 5 washing cycles, the amount of TiO2 NPs was higher on the surface of corona+TiO2 treated nylon than that of the fabric only treated with TiO2 without corona pretreatment. This result justifies that the corona+TiO2 treated nylon fabric with appropriate self-cleaning property can be applied cost-effectively in the textile industry.
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