http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 주제어 : MgO nanoparticle (검색결과 11 건)
- 무료
- 기관 내 무료
- 유료
-
Suresh, Joghee,Pradheesh, Ganeshan,Alexramani, Vincent,Sundrarajan, Mahalingam,Hong, Sun Ig Elsevier 2018 Advanced powder technology Vol.29 No.7
<P><B>Abstract</B></P> <P>Green synthesis is an ecofriendly novel technology and attractive research area for the production of metal oxide nanoparticles in bio-medical and chemical applications. The green perspective includes solvents, reductants or stabilizing agents obtained from a natural resource as they are non-toxic and ecofriendly. In this study, a sustainable green synthetic strategy to synthesize magnesium oxide nanoparticles by employing <I>Costus pictus</I> D. Don plant leaf extract as a reducing agent. The successful formation of magnesium oxide nanoparticles was confirmed by comprehensive characterization techniques. The presence of biomolecules and metal oxides were confirmed by Fourier transform Infrared (FT-IR) spectral data analysis. The X-ray diffraction (XRD) revealed the formation of pure cubic MgO crystalline nanoparticles. The surface morphology of MgO particles observed by Scanning electron microscope (SEM) showed the hexagonal-shaped MgO crystallites. The average size of biosynthesized MgO nanoparticles was measured to be around 50 nm by Transmission Electron Microscopy (TEM). The mechanism for the formation of MgO nanoparticles was suggested in this study. The biosynthesized magnesium oxide particles showed good antimicrobial and exhibited maximum inhibition rate for MgO nanoparticles at 200 µg showing efficient anticancer activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Green chemical approach was used to synthesize hexagonal shaped MgO nanoparticles. </LI> <LI> Aglycone steroid biomolecules play an important role in formation of nanoparticles. </LI> <LI> Hexagonal MgO nanoparticles was confirmed by FTIR, XRD, SEM and TEM analysis. </LI> <LI> Biosynthesized MgO exhibited significant antimicrobial and anticancer activities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Schematic diagram of MgO nanoparticles using <I>costus pictus</I> leaf extract.</P> <P>[DISPLAY OMISSION]</P>
-
Synthesis of terraced and spherical MgO nanoparticles using flame metal combustion
Chae, Sukbyung,Lee, Heesoo,Pikhitsa, Peter V.,Kim, Changhyuk,Shin, Seungha,Kim, Do Heui,Choi, Mansoo Elsevier 2017 Powder technology Vol.305 No.-
<P><B>Abstract</B></P> <P>Controlled synthesis of unconventional spherical/terraced MgO nanoparticles that show a unique optical property was done via the flame metal combustion method. We investigated the optimal condition for selectively producing these spherical/terraced MgO nanoparticles over conventional cubic MgO nanoparticles. Furthermore, it was possible to control the proportion of the morphology of generated MgO nanoparticles using different carrier gases. The size distribution of the MgO nanoparticles was measured to understand the surface-induced growth mechanism of the spherical/terraced MgO nanoparticles, which was different from that of cubic MgO nanoparticles grown from the normal molecule condensation. In addition, the catalytic property of the Li-doped spherical/terraced MgO particles was investigated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spherical/terraced MgO nanoparticles were synthesized using flame metal combustion. </LI> <LI> Terrace/spherical and cube MgO were synthesized selectively by changing gas condition. </LI> <LI> Particle size distribution could be controlled by flame length. </LI> <LI> Flame-made Li/MgO catalyst nanoparticles showed high methane conversion efficiency. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
-
Thermoelectric Properties of Bi2Te2.7Se0.3 Nanocomposites Embedded with MgO Nanoparticles
Sung-Jae Joo,Ji-Hee Son,Bok-Ki Min,이지은,Bong-Seo Kim,Byungki Ryu,Su-Dong Park,이희웅 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.8
Bi2Te2.7Se0.3 bulk materials containing x vol% MgO nanoparticles (average particle size 100 nm, x = 0, 0.5, 1.0, 1.5) were synthesized by using high-energy ball milling and plasma- activated sintering (PAS) without any special process for nanoparticle dispersion. A microstructure investigation using a scanning electron microscope (SEM) confirmed that MgO nanoparticles were properly dispersed in the Bi2Te2.7Se0.3 matrix and that the grain size was smaller in MgO-containing samples due to suppressed grain growth. The resistivity and the maximum Seebeck coefficient of Bi2Te2.7Se0.3 increased with increasing MgO content whereas the thermal conductivity decreased in the measurement temperature range of 298 K - 573 K. As a result, the maximum dimensionless figure of merit, ZTmax, increased about 8.5% in this study, from 0.806 for pristine Bi2Te2.7Se0.3 to 0.875 when x = 1.5. The ZTmax was observed to shift to lower temperature, the electron concentration to decrease, and the electron mobility to increase with increasing x, which were explained using a hypothesis that the TeBi antisite defect concentration decreased as the MgO content increased. In summary, the addition of MgO nanoparticles has been shown to be a simple and effective method to improve the low-temperature thermoelectric properties of n-type Bi2Te3 materials.
-
-
Synthesis of MgO nanoparticles using starch as precursor medium
김수종,한정화 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.2
Nanocrystalline magnesium oxide (MgO) particles were prepared through liquid phase precursor (LPP) method usingmagnesium nitrate as starting material and starch as an impregnatig matrix. The materials obtained by LPP method weresubsequently annealed at 500-1,100 oC for 1-3 hrs to improve crystallinity and phase purity. Crystallization and the growth ofparticles were accelerated with increasing calcining temperature. Crystallization of MgO started around 500 oC, which thetemperature is pyrolysis of starch, cubic phase generated at 600 oC. Moreover, above 600 oC, calcining time had influence oncrystal growth. The obtained MgO nanoparticles were characterized by powder X-ray analysis (XRD), infrared (IR)spectroscopy, photoluminescence (PL), and field emission scanning electron microscopy (FE-SEM). The PL emission spectrumof MgO nanoparticles exhibits two emission peaks at 560 and 618 nm which are due to various structural defects. The cubiccrystal structure with crystalline size of 30-150 nm, is obtained at the calcination temperature of 500-900 oC.
-
Kumaran, Rangarajulu Senthil,Choi, Yong-Keun,Singh, Vijay,Song, Hak-Jin,Song, Kyung-Guen,Kim, Kwang Jin,Kim, Hyung Joo MDPI 2015 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.16 No.4
<P>Water-dispersible MgO nanoparticles were tested to investigate their cytotoxic effects on oxidative stress gene expression. In this <I>in vitro</I> study, genes related to reactive oxygen species (ROS), glutathione <I>S</I>-transferase (GST) and catalase, were quantified using real-time polymerase chain reactions (molecular level) and molecular beacon technologies (cellular level). The monodispersed MgO nanoparticles, 20 nm in size, were used to treat human cancer cell lines (liver cancer epithelial cells) at different concentrations (25, 75 and 150 µg/mL) and incubation times (24, 48 and 72 h). Both the genetic and cellular cytotoxic screening methods produced consistent results, showing that GST and catalase ROS gene expression was maximized at 150 µg/mL nanoparticle treatment with 48 h incubation. However, the genotoxic effect of MgO nanoparticles was not significant compared with control experiments, which indicates its significant potential applications in nanomedicine as a diagnostic and therapeutic tool.</P>
-
Nazeer Abdul Azeez,Udhayakumar Sreelakshmi,Mani Saranpriya,Dhanapal Mothilal,Vijaykumar Sudarshana Deepa 나노기술연구협의회 2018 Nano Convergence Vol.5 No.23
Surface modification of nanoparticles for biological applications is receiving enormous interest among the research community due to the ability to alchemy the toxic nanoparticles into biocompatible compounds. In this study, the agrowastes of Moringa oleifera and Coriandrum sativum were used to surface modify the magnesium oxide nanoparticles and ferric oxide nanoparticles respectively. The agrowaste amended magnesium oxide nano particles (AMNP) and agrowaste amended ferric oxide nanoparticles (AFNP) were characterized using scanning electron microscope, X-ray diffractometer, Fourier transformed-infra red spectroscope to justify the formation and surface modification of nanoparticles with the organic functional groups from the agro wastes. The surface modified nano particles were tested for their biocompatibility and ability to treat the chlorosis in Glycine max. On comparison between the two metal based nanoparticles, AMNP exhibited better chlorosis treating ability than the AFNP. Both the nano particles showed increased potency at minimal amount, 30 μg and the higher concentrations till 125 μg exhibited down run of the potency which was again enhanced from 250 μg of nanoparticle treatment to plants. Further the surface modified nanoparticles were assessed for biocompatibility on human embryonic kidney (HEK-293) cell line which proved that the cell lines are non-toxic to normal human cells. The size of the particles and the concentration is suggested to be responsible for the effective chlorosis treatment and the organic functional groups responsible for the reduction of toxicity of the particles to the plants.
-
Azizi Navid,Jahanmahin Omid,Homayoon Reza,Khajouei Mohammad 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6
Mixed-matrix membranes (MMMs) composed of suitable CO2-philic polymers and fillers can be attractive candidates for CO2/CH4 and CO2/N2 separation due to their high CO2 permeability, good thermochemical stability, low fabrication cost, and fast production process. In this research, a novel ternary MMM was fabricated via the blending of poly (amide 12-b-ethylene oxide) (PEBAX-1074) with polyethylene glycol (PEG-200) and magnesium oxide (MgO) nanoparticles mixture. The effects of various loadings of the fillers on CO2, N2, and CH4 permeability values through the membranes were studied. Permeation of CO2, N2, and CH4 gases through the resultant membranes at pressures of 2, 4, 6, 8, and 10 bar and temperatures of 25, 35, 45, and 55 °C revealed the superiority of the MMMs for CO2/CH4 and CO2/N2 separation in comparison with the pristine membranes. Particularly, at 25 °C and 2 bar, the CO2 permeability, as well as ideal CO2/CH4 and CO2/N2 selectivity of the optimized MMM containing 40 wt% of PEG-200 and 8 wt% of MgO nanoparticles, rose to 210.1 Barrer, 24.9 and 60.9, corresponding to enhancement of around 225%, 23% and 24% of the CO2 permeability and selectivity compared to the neat membrane, respectively. Thus, the fabricated MMM has a satisfying potential to separate CO2 from N2.
-
김창혁,황창선,신승하,양상선,최만수 한국입자에어로졸학회 2007 Particle and Aerosol Research Vol.3 No.4
Magnesium oxide nanoparticles were synthesized by flame metal combustion method using magnesium powder as precursor under various conditions. Properties of synthesized MgO nanoparticles were investigated by XRD and TEM. XRD analyses revealed that MgO nanoparticles synthesized under diverse conditions have high crystallinity without contamination by precursor magnesium. TEM analyses demonstrated that size distributions can be controlled by varying experimental conditions. Temperature, concentration and residence time in flame, which can be adjusted by gas flow rate and feeding rate, affect size distributions of MgO nanoparticles, and in particular, residence time in flame is the most effective factor.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
