• Title, Summary, Keyword: ultrasonic homogenizer

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Morphology, Thermal, Electrical Properties for Epoxy-Layered Silicate Nanocomposites using Homogenizer +Ultrasonic Dispersion Method (Homogenizer+Ultrasonic을 이용한 Epoxy-Layered Silicate Nanocomposites의 구조적, 열적, 전기적 특성연구)

  • Park, Jae-Jun;Um, Ji-Yong;Lee, Chang-Hun;Kim, Min-Kyu;Baek, Kwan-Hyun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.287-288
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    • 2008
  • 에폭시-층상실리케이트 나노콤포지트의 균질분산과 층상실리케이트내로 침투되는 박리정도를 향상시키기 위해 친환경적 분산기법인 물리적방법으로 Homogenizer와 Power Ultrasonic를 적용한 기법을 실시하였다. Homogenizer의 최적속도를 얻기 위해 분산시킨 나노콤포지트의 박리정도, 유리천이온도를 구할 수 있었고, Homogenizer와 Ultrasonic을 동시에 적용하여 최적시간을 구하기 위해 적용된 나노콤포지트를 절연파괴 강도의 Weibull Plots을 통하여 판단할 수 있는 좋은 결과를 얻을 수 있었다.

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Physicochemical Properties of Physically Modified Rice Starch by Homogenizer (균질기를 이용한 물리적 변성 쌀 전분의 이화학적 특성)

  • Han, Myung-Ryun;Kim, Myung-Hwan
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.34 no.5
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    • pp.700-706
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    • 2005
  • The objectives of this research were to analyze physicochemical properties of physically modified rice starch which was prepared by hydro-shear homogenizer and ultrasonic homogenizer. The 5:1 of water to starch ratio, 20,500 rpm of hydro-shear homogenizer, and 5 sec of pulse and 40 kHz of frequency of ultrasonic homogenizer, which were operated for 10 min. The 1/3 of size reduction of raw rice starch and gelatinized rice starch, and reduced of particle size were achieved by above processing conditions. The homogenization of raw rice starch and gelatinized rice starch were higher values of specific area, transmittance, solubility and swelling power than control. While, these had lower value of apparent viscosity than control. In raw rice starch, the gelatinization characteristics of ultrasonic homogenizer treated rice starch had some higher values of gelatinization temperature, peak temperature and enthalpy than those of control. While, those of hydro-shear homogenizer treated rice starch had similar values to those of control.

Inactivation of Seawater Zooplankton Aretemia sp. using Physical and Chemical Processes (물리·화학적 공정을 이용한 해수 동물성 플랑크톤 Aretemia sp.의 소독)

  • Zheng, Cheng;Kim, Dong-Seog;Park, Young-Seek
    • Journal of Environmental Science International
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    • v.24 no.9
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    • pp.1181-1188
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    • 2015
  • In this study, we discussed about the application of the single physical and chemical treatment processes and the physical-chemical complex treatment processes on the inactivation of Artemia sp. in order to satisfy the USCG Phase II (United States Coast Guard). The results showed that initial disinfection rate of ultrasonic process in single batch process is higher than that of electrolysis. However, the inactivation rate showed slower than electrolysis. The inactivation rate of Artemia sp. on the single continuous treatment process ranked in the following order: homogenizer > electrolysis > ultrasonic process. Inactivation rate of Artemia sp. in continuous homogenizer-electrolysis complex process was reached at 100% immediately. A synergistic effect of ultrasonic-electrolytic complex process was found to be a small. The order of processes in a complex process did not affect the disinfection performance.

Mechanical Properties of Vapor Grown Carbon Fiber/Epoxy Nanocomposites With Different Dispersion Methods

  • Khuyen, Nguyen Quang;Kim, Byung-Sun;Kim, Jin-Bong;Lee, Soo
    • Journal of the Korean Applied Science and Technology
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    • v.24 no.3
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    • pp.264-271
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    • 2007
  • Effect of dispersion methods for Vapor Grown Carbon Fibers (VGCF) in epoxy caused the change in mechanical properties of VGCF/epoxy nanocomposites, such as tensile modulus and tensile strength. The influence of VGCF types - atmospheric plasma treated (APT) VGCF and raw VGCF - and their contents was discussed in detail. Treating VGCF with atmospheric plasma enhanced the surface energy, therefore improved the bonding strength with epoxy matrix. Two different methods used to disperse VGCF were ultrasonic and mechanical homogenizer methods. When using dispersion solutions, the VGCF demonstrated good dispersion in ethanol in both homogenizer and ultrasonic method. The uniform dispersion of VGCF was investigated by scanning electron microscopy (SEM) which showed well-dispersion of VGCF in epoxy matrix. The tensile modulus of raw VGCF/epoxy nanocomposites obtained by ultrasonic method was higher than that of one obtained by homogenizer method. APT VGCF/epoxy nanocomposites showed higher tensile strength than that of raw VGCF/epoxy nanocomposites.

A Study on the Dispersion of Multi-walled Nanotube of MWNT/PMMA Nanocomposites (MWNT/PMMA 나노복합재료 제작시 MWNT의 분산에 관한 연구)

  • 김현철;이상의;김천곤;이정주
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.29-32
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    • 2003
  • Multi -walled carbon nanotube(MWNT)/poly(methyl methacrylate) composites were fabricate d through film casting. Manufacturing process was established using a ultrasonic cleaner and a homogenizer. Acetone was used as a solvent to melt PMMA and mix with MWNT. The ultrasonic cleaner performed an important role in producing MWNT/MMA nanocomposites. Ultrasonic energy was utilized to disperse MWNT in acetone. Also, melting PMMA in acetone and mixing MWNT and PMMA were achieved using the homogenizer. It was confirmed that the nanohlbes were well dispersed in PMMA according to SEM images.

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Emulsion Stability of Water/Oil Emulsified Fuel by associated with Emulsifiers (유화제 종류에 의한 Water/Oil 에멀젼 연료의 유화 안정성)

  • Kim, Moon-Chan;Lee, Chang-Suk;Park, Hea-Kyung
    • Journal of the Korean Applied Science and Technology
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    • v.25 no.3
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    • pp.395-403
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    • 2008
  • In this study, the characteristics of emulsified fuel were studied. The emulsified fuel which was composed of water and diesel was manufactured by using homogenizer and ultrasonic generator. The more the percentage of water contents increases, the more the density increases to the emulsified fuel. However, the viscosity increased in the 60% of water contents and decreased in the 70% of water contents because the O/W type was formed. The 3 minutes's ultrasonic waves during the irradiation time was appropriate of 16,000 rpm. And the energy density of ultrasonic waves was 87.5J/g. The emulsion stability has improved in the lower temperature, the lower percentage of water contents, and the most stable emulsion state was obtained from 20%(w/w) of water contents. Also, the emulsion stability was related to the HLB values of emulsifiers. Especially, the HLB values of emulsifier were appropriate from 4 to 7 values.

Improvement of Platinum Particle Dispersion on Porous Electrode for Phosphoric Acid Fuel Cell (연료전지용 다공성전극에 있어서 백금촉매의 분산성개선)

  • Park, Jung-Il;Kim, Jo-Woong;Lee, Ju-Seong
    • Applied Chemistry for Engineering
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    • v.1 no.2
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    • pp.224-231
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    • 1990
  • To improve the dispersion of platinum catalyst, the effects of carbon black surface treatment, solvents, surfactants, and ultrasonic homogenizing were examined. Upon introducing the hydrophilic groups acting as an anchorage center of the catalyst on the surface of carbon black by oxidation, the migrating and growing of platinum particles(or ions) during reduction could be restricted. When mixed solvents, surfactants, or ultrasonic homogenizer were used to disperse catalysts on the carbon black, the dispersion of catalyst could be improved, due to the good permeation of chloroplatinic acid through the pore of carbon black. Among the impregnation methods, the method using ultrasonic homogenizer with mixed solvent was the most excellent. Using this method the particle sized could be minimized in less than $30A^{\circ}$ and distributed homogeneously.

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An Ultrasonic Breaking Action on the Homogeneous Effect of Marine Oil Particles (선박유류 입자의 균질효과에 미치는 초음파 분쇄작용)

  • 이진열;하만식;한원희
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.5 no.2
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    • pp.67-78
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    • 1999
  • Recently, a greater part of all ship use a coarse heavy fuel oil(HFO) over specific gravity(S.G) 1.00/15$^{\circ}C$ and viscosity 3,500 cSt/4$0^{\circ}C$ as the fuel oil of marine boiler or internal combustion engine from the viewpoint of economical ship' operation. The greater plan to improve a combustion methods of heavy fuel oil, such as atomization, homogeneity and emulsification, were contrived and carried out newly, and then applied 20kHz ultrasonic homogenizer to one of test methods. Also, adopted the marine oils(fuel oil and lubricating oil etc.) and sludge oil as test solutions, and its matrix structures were examined with photographs, Especially, it is important at control system of oil pollution, for the sludge oil emulsified, to be recycled as fuel oil of boiler according to 20kHz Ultrasonic homozenizer, and then fuel saving is attained effectively by making sludge oil to be burnt.

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Membrane을 이용한 고분자 합성 신공정

  • 김중현
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.1-4
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    • 1996
  • 유화제의 물리화학적인 성질을 이용하여 O/W와 W/O에멀젼을 제조하는 방법(예:PIT method, D-phase method)은 이제까지 많은 연구가 진행되어 왔으며, colloid mill, homogenizer, ultrasonic emulsifier와 같은 유화장치도 지속적으로 개발 및 개선되고 있다. 하지만 이들 방법은 공정의 정확한 조절이 어려우며, 제조된 에멀젼의 입자크기 분포가 다분산적(polydispersed)이라는 단점을 가지고 있다. 이를 극복하기 위한 방법으로 1980년대 중반에 일본에서 처음으로 개발된 막유화법이 있다. 이 기술은 pouous glass membrane 가운데 기공크기(pore size)가 균일한 SPG(Shirasu Porous Glass)막을 사용하여 균일한 입자분포를 가지는 에멀젼을 제조하는 것이다. 한편 막유화에 사용되는 막이 갖추어야 할 조건은 다음과 같다.

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Structural, Thermal and Mechanical Properties of Nano Composites according to Homogenizer and Power Ultrasonic (균질기와 초음파 동시 분산을 통한 나노콤포지트의 구조적, 열적, 기계적특성)

  • Yeom, Gyoo-Ho;Park, Kwang-Sik;Choe, Seong-Jo;Jeon, Sang-Hoon;Kwak, Young-Hoon;Park, Jae-Jun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.82-82
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    • 2010
  • 에폭시메트릭스 내에서 초음파 및 균질기를 이용하여 층상실리케이트 마이크로 입자의 균질분산을 위하여 사용하였다. 초음파와 균질기를 동시에 사용하여 최적의 적용시간과 충진나노입자 충진함량과의 관계를 연구하기위하여 구조적 특성으로 X-RD, 열적특성으로 DSC, 열적 기계적 특성으로 DMA를 사용하여 특성을 평가하였다. 충진함량 변화에 대해서 층상실리케이트의 층간사이 간격의 변화는 반비례하는 특성을 나타내었고, 충진함량이 증가됨에따라 자체만으로는 크게 응집된 입자의 분산이 미약한 결과로 볼 수 있다. 그러나 Homogenizer와 동시에 분산할 때는 충진함량이 크게 증가하여도 균질한 분산이 이루어졌다.

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