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- 저자 : Zeeshan Khatri (검색결과 5 건)
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Zein/Cellulose Acetate Hybrid Nanofibers: Electrospinning and Characterization
Shamshad Ali,김성훈,Zeeshan Khatri,오경화,김익수 한국고분자학회 2014 Macromolecular Research Vol.22 No.9
Protein based scaffolds are preferred for tissue engineering and other biomedical applications owing totheir unique properties. Zein, a hydrophobic protein, is a promising natural biodegradable polymer. However, electrospunstructures prepared from Zein have poor mechanical and wetting properties. Cellulose acetate (CA) is aneconomical, biodegradable polymer having good mechanical and water retention properties. The aim of presentstudy was to fabricate a novel material by electrospinning Zein/CA blends. A series of Zein/CA hybrid nanofiberswere electrospun and characterized. The attenuated total reflectance-Fourier transform infrared spectroscopy (ATRFTIR)spectrum showed the characteristic peaks of both Zein and CA, and was composition dependent. The X-rayphotoelectron spectrometry (XPS) curves of Zein/CA blends demonstrated a similar profile to that of pristine Zeinnanofibers. Thermogravimetric analyser (TGA) studies confirmed that the Zein/CA hybrid nanofibers have a higherdegradation temperature and better thermal stability than pristine Zein nanofibers. The glass transition temperature(Tg) of Zein/CA hybrid nanofibers was also increased in comparison to pure Zein nanofibers as revealed by differentialscanning calorimetry (DSC). Zein/CA hybrid nanofibers have hydrophilic surface character as revealed bywater contact angle (WCA) analysis. SEM imaging showed bead free morphology of the electrospun nanofibers. The average nanofiber diameter decreased for Zein/CA blends with increasing CA composition. The electrospunZein/CA hybrid nanofibers may be used for tissue engineering scaffolds and for other biomedical materials.
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Shamshad Ali,김성훈,Zeeshan Khatri,오경화,김익수 한국고분자학회 2014 Macromolecular Research Vol.22 No.5
A series of poly(ε-caprolactone) (PCL)/cellulose acetate (CA) ultrafine fiber webs were prepared viaelectrospinning followed by deacetylation in an aqueous alkaline solution to convert CA into cellulose (CEL). Thewetting properties of PCL/CA and PCL/CEL blends were evaluated to investigate wicking behavior. The results showedthat the conversion of PCL/CA into PCL/CEL leads to an improved wettability. Attenuated total reflectance-Fouriertransform infrared (ATR-FTIR) study revealed that CA was completely converted into CEL after deacetylation, andPCL/CEL blends exhibited characteristics peaks of both constituent fibers. The differential scanning calorimetry (DSC)analysis demonstrated that the PCL/CA ultrafine fibers were partially miscible in PCL/CA ultrafine fibers. The fiber morphologyunder field emission scanning electron microscopy (FE-SEM) showed that the electrospun ultrafine fibers were beadfree. The crystallinity of PCL-CEL, (1:4) blend was greatly decreased in comparison to the treated PCL as revealed bywide angle X-ray diffraction (WAXD) measurements. The potential applications of PCL/CEL webs include liquidbiofilters, biosensor and biomedical materials.
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샴샤드 알리,파르크 아흐메드,지산 카트리,김성훈,Ali, Shamshad,Ahmed, Farooq,Khatri, Zeeshan,Kim, Seong Hun The Korean Fiber Society 2015 한국섬유공학회지 Vol.52 No.2
For the first time, the photochromic spiropyran dye [1'-3'-dihydro-1',3',3'-trimethyl-6-nitrospiro [2H-1-benzopyran-2,2'-(2H)-indole] (indole) was successfully embedded as a guest molecule into the poly(${\varepsilon}$-caprolactone) (PCL) host polymer matrix via the electrospinning technique. The resulting PCL/Indole electrospun fibers exhibit photo-switchable properties without losing depth of color upon alternate irradiation with ultraviolet (UV) and visible light. We found that patterned color images could be recorded on the photochromic PCL/Indole electrospun fiber mats using photo-masked UV irradiation. Subsequent irradiation of the mat with visible light completely erased the recorded patterned color image. The transformation of indole from the colorless form to the colored form upon UV irradiation was confirmed by UV-visible spectrophotometry, fluorescence micrography, and water contact angle measurements. Field emissionscanning electron microscopy images revealed the smooth morphology of the PCL/Indole electrospun fibers. Additionally, the average diameter of the PCL/Indole electrospun fibers was significantly lower than that of the PCL electrospun fibers. Good to excellent ratings were achieved for the washing fastness of the PCL/Indole electrospun fiber mats.
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Nadir Hussain,Sana Ullah,Muhammad Nauman Sarwar,Motahira Hashmi,Muzamil Khatri,Takumi Yamaguchi,Zeeshan Khatri,김익수 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
Antibacterial products have paid much more attraction all over global world. In this study, a novel and economicalrout has been studied for antibacterial product, ultrafine nylon-6 (NY-6 NFS) nanofibers impregnated into garlic sour wassynthesized by electrospinning method. The morphology of impregnated nanofiber mats was characterized by electronmicroscopy (SEM). Fourier transform infrared spectroscopy (FTIR) was used to analyze the chemical interaction of Nylon-6nanofiber mats and garlic sour. The antibacterial activities of impregnated garlic sour samples G-1, G-2 and G-3 wereevaluated against Escherichia coli and Staphylococcus aureus bacteria by using disc diffusion method. It was found that thegarlic sour has played a vital role for antibacterial activity. The nanofiber mats impregnated into garlic sour showed excellentantibacterial activity. It was observed that the antimicrobial effect for Escherichia coli and Staphylococcus aureus was morethan 99 %. The excellent hydrophobic property which revealed water contact angle was examined with dropping method andTGA were examined excellent thermal degradation rate of NY-6 NFS and impregnated garlic sour samples. NY-6 NFSshowed good mechanical strength according to ASTM D-638 standard. The obtained results indicate that the NY-6 NFSimpregnated in garlic sour is a promising antibacterial product that can be utilized as antibacterial wound dressing.
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