• Title/Summary/Keyword: hollow particle

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Studies on the Application of High-Gloss Plastic Pigment for Paper Coating(I) (종이도공용 고광택 유기안료의 적용에 관한 연구 -유기안료의 종류가 도공지 품질에 미치는 영향-)

  • 이용규;박규재;정경모
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.32 no.3
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    • pp.32-38
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    • 2000
  • This study was carried out to determine the effect of the type of plastic pigment on the coat-ing structure and printability of coated paper. Three kinds of plastic pigments(solid-bead type binder type and hollow type) were used for hti purpose. IN this research it was observed that particle shape and structure of plastic pigment had influenced the rheology of coating color the state of packing and the properties of coated paper. Inorganic pigments used in this research were platelike kaolin clay and rhombic calcium carbonate. Three kinds of plastic pigments were blended with two inorganic pigments respec-tively. The combination of pigments were carried out(1) to determined the effect of particle structure of plastic pigment on the state of dispersion of coating color(2) to observe the effect of calendering temperature on the property of coated paper prepared with different plastic pigments. The data indicated that binder and hollow type plastic pigment gave the best results in improving the properties of coated paper such as paper gloss opacity and air pet-meability.

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Ignition Characteristics Analysis of Pseudospark Discharge using Hybrid Fluid-Particle(Monte Carlo) Method (복합 유체-입자(몬테칼로)법을 이용한 유사스파크 방전의 기동 특성 해석)

  • 주흥진;심재학;강형부
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1997.11a
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    • pp.270-274
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    • 1997
  • The numerical model that can describe the ignition of the pseudospark discharge using hybrid fluid-particle method has been developed. The evolution process of the discharge has been divided into four phases along the potential distribution. After the plasma enters in the hollow cathode, the confining effect which is one of hollow cathode properties occurs and the electron current on anode rises rapidly. As the plasma expands successively, the sheath contracts and as the electric field in the sheath increases, the field-enhanced thermionic emission(Schottky emission) occurs. From numerical results, the physical mechanism that causes the rapid current rise in the ignition of the pseudospark discharge could be identified.

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The Effect of Particle Size Distribution on the Physical and Optical Properties of Cenosphere (세노스피어(Cenosphere)의 입도 분포에 따른 물리적 특성 및 광학적 특성 평가)

  • Lee, Won-Jun;Hwang, Hae-Jin;Han, Kyu-Sung;Hwnag, Kwang-Taek;Cho, Woo-Suk;Kim, Jin-Ho
    • Korean Journal of Materials Research
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    • v.27 no.7
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    • pp.353-358
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    • 2017
  • Recycled cenosphere, which is a hollow shaped particle from fly ash, has become attractive as a building material due to its light weight and excellent heat insulation and soundproof properties. In this paper, we investigated the effect of cenosphere size on the physical and optical properties. High brightness of cenosphere as raw material is required for a wide range of ceramics applications, particularly in fields of building materials and industrial ceramic tiles. Cenospheres were sorted by particle size; the microstructure was analyzed according to the cenosphere size distribution. Cenospheres were generally composed of quartz, mullite, and amorphous phase. Colour measurement corresponding to chemical composition revealed that the contents of iron oxide and carbon in the cenospheres were the major factors determining the brightness of the cenospheres.

Micron-Sized Hollow Plastic Pigment (마이크론 크기의 중공 유기 안료)

  • Choi, Gwang-Sik;Kim, Yang-Soo;Jung, Hoon-Sang;Jang, Seo-Won;Kim, Nam-Seon
    • Polymer(Korea)
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    • v.33 no.5
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    • pp.463-468
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    • 2009
  • Syntheses of monodisperse and micron-sized hollow plastic pigment (HPP) were carried out through the core-shell reaction. The effects of the reaction parameters, such as the particle size, molecular weight, the swelling time, agitation rate, and the solid contect were investigated. This micron-sized HPP could be made by using the alkali soluble core with at least bigger than 200 nm size. To obtain a higher opacity ratio, the swelling time and molecular weight of the core should be controlled. The agitation rate affected the particle's morphology. To prevent the shell destruction, the agitation rate must be sufficiently low in case of the syntheses of micron-sized HPP. In this study, micron-sized HPP exhibiting the high hiding power and narrow particle distribution could be obtained.

Design optimization of a hollow shaft through MATLAB and simulation using ANSYS

  • Mercy, J. Rejula;Stephen, S. Elizabeth Amudhini;Edna, K. Rebecca Jebaseeli
    • Coupled systems mechanics
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    • v.11 no.3
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    • pp.259-266
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    • 2022
  • Non-Traditional Optimization methods are successfully used in solving many engineering problems. Shaft is one of important element of machines and it is used to transmit power from a machine which produces power to a machine which absorbs power. In this paper, ten non-traditional optimization methods that are ALO, GWO, DA, FPA, FA, WOA, CSO, PSO, BA and GSA are used to find minimum weight of hollow shaft to get global optimal solution. The problem has two design variables and two inequality constraints. The comparative results show that the Particle Swarm Optimization outperforms other methods and the results are validated using ANSYS.

Effect of the Surfactant Concentration on the Formation of Water Glass-based Porous Hollow Silica Microsphere (Porous한 물유리 기반 실리카 중공 미세구 형성에 대한 계면활성제 농도의 영향)

  • Lee, Jihun;Kim, Younghun;Kim, Taehee;Park, Hyung-Ho
    • Journal of the Microelectronics and Packaging Society
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    • v.28 no.4
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    • pp.79-83
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    • 2021
  • In this study, hollow silica microspheres (HSM) of various sizes formed according to the concentration of surfactants using water glass as a precursor, which is advantageous for commercialization due to its lower unit cost compared to conventional silicon alkoxide (tetraethyl orthosilicate, TEOS) was synthesized. The physical properties of the silica hollow microspheres according to the concentration of surfactant were analyzed using Fourier transform infrared, contact angle measurement, Brunauer-Emmett-Teller and Barrett-Joyner-Halenda analyzers and field emission scanning electron microscopy. When porous water glass-based hollow silica spheres were prepared by adding a surfactant at an appropriate concentration, it was confirmed that excellent hollow silica spheres were formed with a specific surface area of 169 m2/g, an average particle size of 25.3 ㎛, and a standard deviation of 6.25.

Preparation of polymer composites containing hollow magnetic particles and measurement of their electromagnetic properties (중공 자성입자를 포함한 복합재료 제조 및 전자파 특성 측정)

  • Yi, Jin-Woo;Lee, Sang-Bok;Kim, Jin-Bong;Lee, Sang-Kwan;Park, Ki-Yeon
    • Composites Research
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    • v.21 no.2
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    • pp.31-35
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    • 2008
  • In order to design light weight and high efficient electromagnetic wave absorbing materials, hollow magnetic particles have been introduced in this study. The electroless plating method has been utilized to coat Ni and Fe on the substrates of synthesized polystyrene particles of submicron size. Removing polystyrene particles by heat treatment resulted in hollow structures. Observation by SEM, TEM and EDS confirmed the surface morphology and coating thickness of Ni and Fe. Polymeric composites containing hollow particles were tested in order to compare the electromagnetic properties between Ni coated and Fe costed particles. The composite of 30 wt% Fe hollow particles showed the higher complex permeability than Ni hollow particles or the conventional barium ferrite particles.