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Materials chemistry and physics 65건

  1. [해외논문]   Carbon adhered iron oxide hollow nanotube on membrane fouling  

    Muthukumar, Krishnan (Inorganic Materials and Catalysis Division, Council of Scientific and Industrial Research (CSIR), Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), India ) , Shanthana lakshmi, D. (Reverse Osmosis Division, Council of Scientific and Industrial Research (CSIR), Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), India ) , Saxena, Mayank (Reverse Osmosis Division, Council of Scientific and Industrial Research (CSIR), Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), India ) , Jaiswar, Santlal (Marine Biotechnology and Ecology Division, Council of Scientific and Industrial Research (CSIR), Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), India ) , Natarajan, Saravanan (Centre for Nanobiotechnology, VIT University, Vellore 632014, India ) , Mukherjee, Amitava (Centre for Nanobiotechnology, VIT University, Vellore 632014, India ) , Bajaj, H.C. (Inorganic Materials and Catalysis Division, Council of Scientific and Industrial Research (CSIR), Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), India)
    Materials chemistry and physics v.211 ,pp. 468 - 478 , 2018 , 0254-0584 ,

    초록

    Abstract Ultrafiltration membrane's efficiency and antifouling properties can be enhanced by blending with benign tailor made inorganic nano-materials. Carbon adhered Fe 3 O 4 hollow nanotube, nanosheet synthesized from iron alkoxide using iron (III) acetate source refluxed with methanol. The prepared Fe 3 O 4 (nanotubes & nanosheets) were characterised by PXRD, FE-SEM, TEM, FT-IR and elemental analysis. Polymer nanocomposite membranes were prepared by blending PVDF (14 wt%)/Fe 3 O 4 (2 wt%)/DMF and characterised in detail. PVDF/Fe 3 O 4 (hollow nanotube) composite membrane showed enhanced flux property and antifouling efficiency confirmed by BSA rejection and molecular weight cut-off (MWCO). The biofilm formation studies of PVDF/Fe 3 O 4 hollow nanotube composite membrane were evaluated using E. coli, fresh water Bacillus subtilis and marine Bacillus bacteria showed excellent control of biofilm growth by PVDF/Fe 3 O 4 (hollow nanotube) membrane. The antifouling studies of PVDF blank and PVDF/Fe 3 O 4 (holow nanotube) with B. subtilis and P. aeruginosa showed 0.943 ± 0.02, 0.932 ± 0.01 A.U for PVDF blank and 0.88 ± 0.02 and 0.802 ± 0.02 A.U, and this indicates the significant antifouling control arise from the Fe nanomaterial. Highlights Synthesis of carbon adhered iron oxide hollow nanomaterial (tube, sheet). Characterization by PXRD, FE-SEM and HR-TEM. Preparation of PVDF ultrafiltration composition membrane using iron oxide nanomaterial. Effect of nanomaterial on membrane's flux and antibiofouling property. Graphical abstract [DISPLAY OMISSION]

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  2. [해외논문]   Aptamer-functionalized magnetic graphene oxide nanocarrier for targeted drug delivery of paclitaxel  

    Hussien, Nizamudin Awel (Department of Chemistry, Kırıkkale University, Kırıkkale, Turkey ) , Iş (Department of Chemistry, Kırıkkale University, Kırıkkale, Turkey ) , ıklan, Nuran (Department of Bioengineering, Kırıkkale University, Kırıkkale, Turkey) , Tü , rk, Mustafa
    Materials chemistry and physics v.211 ,pp. 479 - 488 , 2018 , 0254-0584 ,

    초록

    Abstract Targeted drug delivery has come out as a golden system owing to its capability to reduce side effects and increase efficacy. The application of graphene oxide (GO) based nanomaterials for targeted delivery has recently attracted several researchers because of their advantageous properties. Herein, we have attempted to prepare aptamer-conjugated magnetic graphene oxide (MGO) nanocarrier, which can specifically target tumor cells. MGO nanocarriers were prepared by attaching Fe 3 O 4 on the layer of GO and then, aptamer (APT) was linked as a targeting moiety. Paclitaxel (PAC), an anti-cancer drug, was also loaded on the nanocarrier. PAC loading and in vitro release results revealed a very good loading performance with entrapment efficiency 95.75% and high pH-responsive release. Cellular toxicity assay showed MGO nanocarriers are biocompatible having cell viability greater than 80% for L-929 fibroblast cell line. Besides, high cytotoxic effect was observed for PAC and PAC loaded MGO (MGO@PAC) on MCF-7 cancer cells, at different drug doses. Furthermore, flow cytometry investigation reveals that the obtained nanocarrier can specifically bind to MCF-7 cancer cells. Therefore, based on the results the prepared superparamagnetic nanocarrier could be considered as a promising agent for cancer drug delivery systems. Highlights MGO nanocarrier was prepared by loading Fe 3 O 4 on GO sheet. MGO was observed to be biocompatible having superparamagnetic characteristics. MGO has showed a very good drug loading performance and pH-responsive release. Aptamer conjugated MGO was found to be specifically targeting MCF-7 cancer cell. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  3. [해외논문]   Synthesis and Magneto–Thermal properties of NiPd nanoparticles  

    Ç (Department of Nanotechnology and Nanomedicine, Hacettepe University, 06800, Beytepe, Ankara, Turkey ) , itoğ (Department of Physics Engineering, Hacettepe University, 06800, Beytepe, Ankara, Turkey ) , lu, Senem (Department of Physics Engineering, Hacettepe University, 06800, Beytepe, Ankara, Turkey) , Coş , kun, Mustafa , Fırat, Tezer
    Materials chemistry and physics v.211 ,pp. 489 - 500 , 2018 , 0254-0584 ,

    초록

    Abstract In this study, two NiPd magnetic alloys, i.e., Ni 30 Pd 70 and Ni 50 Pd 50 , were synthesized for use in magnetic hyperthermia. The alloys were synthesized using the polyol method and identified using a powder X-ray diffractometer (XRD), transmission electron microscope (TEM), scanning electron microscope–energy dispersive X-ray spectrometer, and vibrating sample magnetometer. The magneto–thermal properties were determined using a fiber optic thermometer and induction heating system. The average crystal sizes of the Ni 30 Pd 70 and Ni 50 Pd 50 alloys were determined to be 3.48 ± 0.04 nm and 2.47 ± 0.11 nm, respectively, based on the XRD patterns. The magnetization measurements indicated that Ni 30 Pd 70 sample exhibited paramagnetic property while the Ni 50 Pd 50 alloy shows superparamagnetic and ferromagnetic behaviors at room temperature. The magnetization versus temperature measurements showed that the blocking temperature of the Ni 30 Pd 70 alloy was less than 10 K and the blocking temperature of the Ni 50 Pd 50 alloy was around 155 K. The specific absorption rate values were calculated to range between 0.2 and 7.6 W g −1 based on magneto-thermal experiments under the AC magnetic field ranging from 8.7 to 23.7 kA/m. Highlights NiPd nanoparticles with two different compositions were synthesized by chemical method. Average particle sizes of Ni 30 Pd 70 and Ni 50 Pd 50 nanoparticles are 3.26 ± 0.04 nm and 2.70 ± 0.05 nm, respectively. Ni 30 Pd 70 nanoalloy composition is Ni 36.0±1.1 Pd 64.0±1.1 , Ni 50 Pd 50 alloy composition is Ni 53.3±0.7 Pd 46.7±0.7 . At room temperature, the Ni 30 Pd 70 alloy shows a typical paramagnetic behaviour and the Ni 50 Pd 50 alloy has superparamagnetic property besides ferromagnetic behaviour.

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  4. [해외논문]   Enhanced mechanical and gas barrier properties of poly(ε-caprolactone) nanocomposites filled with tannic acid-Fe(III) functionalized high aspect ratio layered double hydroxides  

    Mao, Long (Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024, PR China ) , Wu, Hui-qing (Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024, PR China ) , Liu, Yue-jun (Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024, PR China ) , Yao, Jin (Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province, Hunan University of Technology, Zhuzhou 412007, PR China ) , Bai, Yong-kang (Institute of Polymer Science in Chemical Engineering, Xi'an Jiao Tong University, Xi'an 710049, PR China)
    Materials chemistry and physics v.211 ,pp. 501 - 509 , 2018 , 0254-0584 ,

    초록

    Abstract Inspired by versatile adhesive ability of mussel adhesion proteins, tannic acid-Fe(III) functionalized high aspect ratio layered double hydroxides (LDHs@TA-Fe(III)) was firstly prepared via a facile and fast deposition of one-step assembled TA-Fe(III) coatings on the surface of layered clay. LDHs@TA-Fe(III)/poly (ε-caprolactone) (PCL) nanocomposites were prepared by blending LDH@TA-Fe(III) and pure PCL via solution casting method to obtain homogeneous films. The results of thermal analysis confirm that LDHs@TA-Fe(III) can act as a nucleating agent. It is revealed that the inclusion of LDHs@TA-Fe(III) up to an appropriate level of content resulted in a remarkable enhancement in the mechanical and gas barrier properties. However, excess LDHs@TA-Fe(III) loadings give rise to a decrease in the mechanical properties. With incorporation of only 1 wt % LDHs@TA-Fe(III), a 47% increase in elongation at break and 21% reduction in the oxygen relative permeability are achieved. The reinforcement effect brought by LDHs@TA-Fe(III) is fairly noteworthy at low clay loadings potentially owing to the strong interfacial interactions between the clay and matrix. Highlights Core-shell structured tannic acid-Fe(III) network complex-coated high aspect ratio LDHs were prepared in-situ . The enhanced mechanical and barrier properties rely on strong interfacial adhesion and compatibility. The presence of surface modified layered clay has a higher impact on free volume holes' density than their size. Graphical abstract [DISPLAY OMISSION]

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  5. [해외논문]   Structural, optical, electronic and magnetic properties of multiphase ZnO/Zn(OH)2/ZnO2 nanocomposites and hexagonal prism shaped ZnO nanoparticles synthesized by pulse laser ablation in Heptanes  

    Awan, Saif Ullah (Department of Electrical Engineering, NUST College of Electrical and Mechanical Engineering, National University of Sciences and Technology (NUST) Islamabad, Pakistan ) , Hasanain, S.K. (Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan ) , Rashid, Jamshaid (Department of Environmental Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan ) , Hussain, Shahzad (Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan ) , Shah, Saqlain A. (Department of Physics, Forman Christian College University, Lahore, Pakistan ) , Hussain, Mian Zahid (Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan ) , Rafique, Mohsin (Department of Physics, COMSATS Institute of Information Technology, Islamabad 44000, Pakistan ) , Aftab, M. (Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan ) , Khan, Rashid (Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan)
    Materials chemistry and physics v.211 ,pp. 510 - 521 , 2018 , 0254-0584 ,

    초록

    Abstract We have studied structural, optical, electronic and magnetic properties of undoped well crystalline hexagonal and non-hexagonal ZnO system. X-ray diffraction (XRD) and high resolution transmission electron micrographs (HRTEM) of air annealed at 550 °C (sample-d) confirmed the presence of hexagonal (wurtzite) single phase ZnO. Raman analysis detected the vibrations of fundamental and second order phonons of Zn and oxygen related species. In Photoluminescence (PL) spectra, we observed that the intensity of UV peak decreases as annealing temperature increases. Broad PL visible band of samples shifted towards lower wavelength due to annealing effects. Fitting of broad PL spectra confirmed the existence of Zinc interstitial (Zn i ), Zinc vacancy (V Zn ) and oxygen vacancy (V o ) defects. To determine the Zn interstitial and vacancy defects Auger peaks were de-convoluted from X-ray photoelectron spectroscopy (XPS) survey scan. Oxygen vacancies are estimated by fitting of asymmetric XPS O-1s spectra. Incomplete oxidation of magnetization versus temperature in the presence of applied field showed the presence of irreversibility in 550 °C annealed-sample. Zn clusters and secondary phases are may be reason of room temperature ferromagnetism in non-hexagonal samples (a-c). While, complex defect (zinc and oxygen vacancies) as observed in electronic and PL data may be responsible for inducing, promoting and stabilizing room temperature ferromagnetism in well crystalline hexagonal ZnO nanoparticles (sample-d). Highlights Well controlled synthesis of nanocomposites and nanoparticles. XRD identify multiple and single phase systems. PL and XPS spectra confirmed the presence of Zn i , V Zn and V o defects. Complex defects may be induce, promote and stabilize RTFM. ZnO is suitable for Spintronics. Graphical abstract [DISPLAY OMISSION]

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