• Title, Summary, Keyword: natural material

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Preparation and Characterization of Natural Material Extracted from Germinated Brown Rice

  • Lim, Ki-Taek;Choi, Jeong Moon;Lim, Won-Chul;Kim, Jangho;Cho, Hong-Yon;Chung, Jong Hoon
    • Journal of Biosystems Engineering
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    • v.39 no.3
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    • pp.235-243
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    • 2014
  • Purpose: The aim of this study was to prepare and evaluate a natural material extracted from germinated brown rice (GBR). Herein, we evaluated whether the natural material could positively activate the biological effects seen during bone formation, including enhancement of metabolic activity, osteogenesis, and the expression of vascular endothelial growth factor (VEGF), one of the growth factors in human osteoblast-like cells. Methods: The natural material was created by a hot water extraction process after being soaked for 2~3 days in tap water and dried at $50^{\circ}C$. The material was characterized using field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Fourier transformed infrared (FTIR) spectroscopy. The biological behaviors of the material were also investigated; we performed tests to assess cell cytotoxicity, metabolic activity, osteogenic markers related to bone formation, and VEGF. Results: The EDX, XRD, and FTIR results for the natural material indicated the presence of organic compounds. The natural material caused positive increases in cell metabolic activity and mineralized bone formation without cytotoxicity. The protein levels in the extract for the $6.25{\mu}g/mL$, $12.25{\mu}g/mL$, $25{\mu}g/mL$, $50{\mu}g/mL$, and $100{\mu}g/mL$ groups were significantly different from that for the control. Conclusions: The GBR-based natural material was easy to prepare and had characteristics of a potential biomaterial. The biocompatibility of this natural material was evaluated using in vitro techniques; our findings indicate that this novel material is promising for agricultural and biological applications.

(A) Study on Natural Dyeing of polyester(I) - Ginseng Microcapsules - (폴리에스테르의 천연염색 처리 방법에 관한 연구(I) - 인삼 마이크로캡슐을 중심으로 -)

  • Min, Kyung-Hae
    • Fashion & Textile Research Journal
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    • v.10 no.4
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    • pp.560-565
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    • 2008
  • Plantae of the natural material has been broadly used on cloth dyeing by it's specific properties such as eco-friendly and innoxious. However dyeing with natural material on synthetic fiber is nearly impossible due to poor affinity between natural material and synthetic fiber. The method which is binding with micro-capsulized natural material to cloth, used in this study, has low change on quality by external influence. Also this method has high ability in spray effect by broken capsule which comes to pressure and friction when the treated cloth was dressed. And this method is applicable widely from natural fiber to synthetic fiber. The purpose of this study is to develop the multi-functional synthetic material with micro-capsulized Ginseng on PET. Moreover, it was driven by comparison of colormetric properties and fastness between regular dip-dyeing method and binding with micro-capsulized material method. Dyeability showed a little bit low exhaustion but the PET treated by micro-capsule was more or less better than the dip dyed PET. Through the SEM(Scanning Electron Microscope) of PET treated by micro-capsule, it has good residence of capsules even after 5 or 10 times washing. Wash and light fastness were revealed some different grades by each condition but showed high level, in most and the micro-capsulized PET was more improver than regular dip dyed PET.

A Multifunctional Material Based on Triphenylamine and a Naphthyl Unit for Organic Light-Emitting Diodes, Organic Solar Cells, and Organic Thin-Film Transistors

  • Kwon, Jongchul;Kim, Myoung Ki;Hong, Jung-Pyo;Lee, Woochul;Lee, Seonghoon;Hong, Jong-In
    • Bulletin of the Korean Chemical Society
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    • v.34 no.5
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    • pp.1355-1360
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    • 2013
  • We have developed a new multifunctional material, 4,4',4"-tris(4-naphthalen-2-yl-phenyl)amine (2-TNPA), which can be used as a blue-emitting and hole-transporting material in organic light-emitting diodes (OLEDs), as well as a donor material in organic solar cells (OSCs) and an active material in organic thin-film transistors (OTFTs). The OLED device doped with 3% 2-TNPA shows a maximum current efficiency of 3.0 $cdA^{-1}$ and an external quantum efficiency of 3.0%. 2-TNPA is a more efficient hole-transporting material than 4,4'-bis[N-(naphthyl-N-phenylamino)]biphenyl (NPD). Furthermore, 2-TNPA shows a power-conversion efficiency of 0.39% in OSC and a field-effect mobility of $3.2{\times}10^{-4}cm^2V^{-1}s^{-1}$ in OTFTs.

Study for Natural Frequency of Offshore Wind Turbine Tower (해상 풍력 발전용 Tower의 고유 진동 해석에 관한 연구)

  • Won, Jong-Bum;Lee, Kang-Su;Son, Choong-Yul
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1296-1301
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    • 2006
  • The Object of this paper which study for natural frequency of Offshore Wind Turbine Tower with Composite Material and Steel. The Composit Material Tower consist of shell type and stiffened shell type which is made by the method of Filament Winding. And the component of Composite material is used by the Roving RS220PE-535. The Steel Material Tower consist of shell type and stiffened shell type which is made of Mild steel. The Type of Stiffener is hats. This paper compare the Composit Material Offshore Wind Turbine Tower with the Steel Material Offshore wind Turbine Tower and study for Natural Frequency and Mode Shapes.

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AMPK Activators from Natural Products: A Patent Review

  • Uddin, Mohammad Nasir;Sharma, Govinda;Choi, Hong Seok;Lim, Seong-Il;Oh, Won Keun
    • Natural Product Sciences
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    • v.19 no.1
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    • pp.1-7
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    • 2013
  • AMP-activated protein kinase (AMPK) is a major cellular energy sensor and master regulator of metabolic homeostasis. On activation, this cellular fuel sensing enzyme induces a series of metabolic changes to balance energy consumption via multiple downstream signaling pathways controlling nutrient uptake and energy metabolism. This pivotal role of AMPK has led to the development of numerous AMPK activators which might be used as novel drug candidates in the treatment of AMPK related disorders, diabetes, obesity, and other metabolic diseases. Consequently, a number of patents have been published on AMPK activators from natural products and other sources. This review covers the patented AMPK activators from natural products and their therapeutic potential in treatment or prevention of metabolic diseases including diabetes and obesity.

A Study on the industrialization of a natural dye-Dyeing yellowish colours with onion skin- (천연염료의 산업화에 관한 연구-양파껍질을 이용한 황색계열 염색-)

  • 노은희
    • Archives of design research
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    • v.20
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    • pp.211-217
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    • 1997
  • Natural dyes don't pollute the environments in contrast to artifical dyes. The cloths dyed with natural material can be developed into insect-proof clothing and bedding. With natural tint, they can also produce natural images. The purpose of this paper is to show the way to develop the natural dye material easily available at cheap cost, to produce high value added products in terms of dyeing a wide range of colors by using this material, and to suggest the way for farmers to cultivate the onions in their idle land, thus gaining additidnal income. In the process of dyeing natural cloth with onion skin produced largely in Mooan, Chonnam, we were able to extract a wide spectrum of colours from yellow to pale brown and gray. Having reaped good results in the various endurance tests(of washing, friction, water, sweat, sunlight), this material is estimated to be highly worthy of industrialization.

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The electrochemical properties of hybrid carbon as a negative active material for lithium ion batteries (리튬이온전지용 음극 활물질 하이브리드형 탄소의 전기화학적 특성)

  • Yang, Dong-Bok;Park, Yong-Pil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.27-30
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    • 2004
  • Different types of hybrid negative materials on pitch based carbon and natural graphite for lithium ion batteries were studied. Two types of active materials were prepared, that is, pitch based graphite carbon, and pitch based carbon impregnating natural graphite. The specific capacity, capacity recovery in high temperature condition, and other electrochemical properties were achieved for these materials. We found that addition of natural graphite type to the pitch based carbon can significant1y improve the specific capacity and interfacial resistance. However, use of natural graphite will cause a serious capacity loss in the high temperature condition owing to its increasing interface resistance. The specific capacity ranged from 321 to 348 mAh/g and the maximum specific capacity was obtained in the case of pitch based carbon impregnating natural graphite.

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Natural vibration of the three-layered solid sphere with middle layer made of FGM: three-dimensional approach

  • Akbarov, Surkay D.;Guliyev, Hatam H.;Yahnioglu, Nazmiye
    • Structural Engineering and Mechanics
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    • v.57 no.2
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    • pp.239-263
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    • 2016
  • The paper studies the natural oscillation of the three-layered solid sphere with a middle layer made of Functionally Graded Material (FGM). It is assumed that the materials of the core and outer layer of the sphere are homogeneous and isotropic elastic. The three-dimensional exact equations and relations of linear elastodynamics are employed for the investigations. The discrete-analytical method proposed by the first author in his earlier works is applied for solution of the corresponding eigenvalue problem. It is assumed that the modulus of elasticity, Poisson's ratio and density of the middle-layer material vary continuously through the inward radial direction according to power law distribution. Numerical results on the natural frequencies related to the torsional and spheroidal oscillation modes are presented and discussed. In particular, it is established that the increase of the modulus of elasticity (mass density) in the inward radial direction causes an increase (a decrease) in the values of the natural frequencies.