• 제목/요약/키워드: dispersibility

검색결과 215건 처리시간 0.026초

Novel Convenient Method to Determine Wettability and Dispersibility of Dairy Powders

  • Lee, Jeae;Chai, Changhoon;Park, Dong June;Lim, Kwangsei;Imm, Jee-Young
    • 한국축산식품학회지
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    • 제34권6호
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    • pp.852-857
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    • 2014
  • This study was carried out to develop a simple, convenient, and reproducible testing device to determine wettability and dispersibility of dairy powders. The testing device consists of a sieve ($150{\mu}m$) attached to a sample chamber, sensors mounted on a supporting body and a main control unit containing a display panel. The sensors detect the difference in electrical resistance between air and water. A timer is automatically triggered by the sensor when the bottom of sample-loaded chamber contacts water in the petri dish. Wettability and dispersibility of commercial skim milk powders (SMPs) produced at different heating strengths (low-, medium-, and high-heat SMP) are compared using the new testing device. Wettability of the SMPs were correlated with particle size and are found to increase in the order of medium-, low-, and high-heat SMP regardless of the amount of sample tested. Dispersibility of SMPs showed the same trend and high heat-SMP which has the smallest particle size resulted in the lowest dispersibility. Unlike existing methods, the new testing device can determine both wettability and dispersibility of powders and successfully detected differences among the samples.

Effects of Injection Conditions on Dispersibility of TiO2 in Polymerization of Poly(ethylene terephthalate)

  • Park, Seong-Yoon;Kim, Hak-Yong;Jin, Fan-Long;Park, Soo-Jin
    • Bulletin of the Korean Chemical Society
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    • 제31권10호
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    • pp.2893-2896
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    • 2010
  • In this study, the optimal preparation conditions in the polymerization process of poly(ethylene terephthalate) (PET) were studied in detail. As a result, the dispersibility of $TiO_2$ was significantly improved by the addition of dispersant and steric hinderance additives into $TiO_2$/ethylene glycol (EG) slurry during the esterification step. The addition sequence of $TiO_2$/EG slurry and stirring also affected the dispersibility of $TiO_2$. The SEM results showed that some $TiO_2$ particles were agglomerated in the PET matrix. The full dull (FD) PET chip and fiber were prepared according to the optimal preparation conditions. The FD PET fiber exhibited a better dispersibility than that of the FD PET chip.

Effects of Intercalant on the Dispersibility of Silicate Layers in Clay- dispersed Nanocomposite of Poly(styrene-co-acrylonitrile) Copolymer

  • Ko, Moon-Bae;Park, Min;Kim, Junkyung;Choe, Chul-Rim
    • Macromolecular Research
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    • 제8권2호
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    • pp.95-101
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    • 2000
  • Clay/poly(styrene-co-acrylonitrile) copolymer (SAN) hybrids have been prepared by simple meltmixing of two components, SAN and organophilic clays with a twin screw extruder. Effects of intercalant on the dispersibility of silicate layers in clay-dispersed nanocomposite were studied by using five different organophilic clays modified with the intercalants of different chemical structures and different fractions of intercalant. The dispersibility of 10-$\AA$-thick silicate layers of clay in the hybrid was investigated by using an X-ray diffractometer and a transmission electron microscope. It was found that if the fraction of intercalant in the organophilic clay becomes too high, SAN is difficult to intercalate into the inter-gallery of silicate layers in the hybrid prepared at 180$\^{C}$, and thus the hybrid shows poor dispersibility of silicate layers. The flexural modulus of the hybrid increases as the dispersibility of silicate layers in the hybrid increases.

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다공성 분체가 CNTs의 분산성에 미치는 영향 (Effect of Porous Powder on CNTs Dispersibility)

  • 이건철;김영민
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2020년도 봄 학술논문 발표대회
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    • pp.199-200
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    • 2020
  • In this study, the effect of porous powders on the dispersibility and strength properties of CNTs was examined.As a result of the experiment, it was found that in the case of incorporation of CNT, the compressive strength property was significantly improved by improving the dispersibility of CNT.

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용액혼합법에 따른 나노복합재료 분산성 및 전기적 특성 (Dispersibility, Electrical Property of Nano-Composite by Solution Mixing Method)

  • 양훈;박대희
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2008년도 춘계학술대회 논문집 센서 박막재료연구회 및 광주 전남지부
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    • pp.73-74
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    • 2008
  • In this paper, we have investigated dispersibility, volume resistivity of nano-composite by solution mixing method. Dispersibility measured by FE-SEM(Field Emission Scanning Electron Microscope. And volume resistivity measured by ASTM D991. To expect interaction used dual filler system. But, dual filler system had influence on polymer complex. So, polymer chain mobility doesn't resist.

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Properties of Silica-SBR Compounds Using Cellulose Dispersant Applicable to Tire Tread Rubber

  • Kim, Jung Soo;Kim, Dong Hyun
    • Elastomers and Composites
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    • 제55권3호
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    • pp.176-183
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    • 2020
  • Silica-styrene butadiene rubber (Silica-SBR) compounds have been used in the preparation of tire treads. The silica dispersibility of silica-SBR compounds is related to the processability, mechanical properties, and wear resistance of tires. Recently, in order to improve the silica dispersibility of the silica-SBR compounds, the wet masterbatch (WMB) process was introduced, which is a method of mixing rubber in the water phase. We aimed to improve the silica dispersibility of the silica-SBR compounds by preparing a silica dispersant applicable to the WMB process. For this purpose, cellulose, 2-hydroxyethyl cellulose, and cellulose acetate were employed as a silica dispersant. The silica dispersibility of the compounds was measured by a moving die rheometer. Improvement in the processability of silica-SBR compounds was evaluated by the Mooney viscometer. The wear resistance of silica-SBR compounds using a cellulose dispersant was improved by up to 29%.

Particle Dispersibility Improvement of Polyester Fibers with a New Line Injection

  • Park, Seong-Yoon;Kim, Hak-Yong;Jin, Fan-Long;Park, Soo-Jin
    • Bulletin of the Korean Chemical Society
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    • 제31권9호
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    • pp.2637-2643
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    • 2010
  • In order to develop a new line injection system for spin draw yarn (FD SDY) fibers, the effect of various parameters in extrusion and melt line conditions on the dispersion and distribution of $TiO_2$ particles within FD PET fibers was investigated. As a result, the dispersibility of $TiO_2$ particles in a PET matrix is found to depend on the particle size and its surface characteristics. Surface modification of $TiO_2$ by dimethyl polysiloxane resulted in the improved dispersibility and affinity of $TiO_2$ particles in the PET matrix. Especially, residence time, mixing temperature, and mixing shear rate in the new line injection system under the SDY spinning process were very important parameters to minimize the agglomeration of $TiO_2$ particles. The FD SDY prepared by the new line injection system was superior to those using the polymerization process and the conventional masterbatch chip dosing process in the color-L and color-b values of the fibers.

Butyl 및 Hexyl기가 도입된 다중벽 탄소나노튜브의 분산성 (Dispersibility of multi-walled carbon nanotubes functionalized with butyl and hexyl group)

  • 유정현;남병욱
    • 한국산학기술학회논문지
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    • 제11권7호
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    • pp.2713-2718
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    • 2010
  • 탄소나노튜브의 분산성을 개선하고자 다중벽 탄소나노튜브(multi-walled carbon nanotube, MWNT)를 초음파 반응기에서 butyllithium 및 hexyllithium solution을 이용하여 표면을 화학적으로 개질하였다. 개질된 MWNT는 적외선 분광분석 및 라만분광법을 이용하여 MWNT에 알킬기가 도입되었는지를 확인하였다. 또한, 열중량분석기를 이용하여 알킬기가 MWNT에 도입된 함량을 분석하였으며, MWNT 및 개질된 MWNT를 다양한 용매에 따른 분산성을 조사하였다. 그 결과 유기물의 함량은 5% 내외로 분석되었고 일정 범위내의 용해도 상수를 갖는 용매에 분산성이 개선됨을 확인하였다.

Effect of Particle Size on the Solubility and Dispersibility of Endosperm, Bran, and Husk Powders of Rice

  • Lee, Jeong-Eun;Jun, Ji-Yeon;Kang, Wie-Soo;Lim, Jung-Dae;Kim, Dong-Eun;Lee, Kang-Yeol;Ko, Sang-Hoon
    • Food Science and Biotechnology
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    • 제17권4호
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    • pp.833-838
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    • 2008
  • Size effects of rice product powders on physical properties including suspension stability were investigated in this study. Endosperm, bran, and husk powders of rice with different size particles were prepared using the pin crusher or the ultrafine air mill. The physical properties of the powders were examined using particle size analysis, scanning electron microscopy, and spectrophotometry. The peak of the volume-weighted particle distribution of ultrafine endosperm particles was at $5.4\;{\mu}m$ whereas those of the bran and the husk appeared at 65 and $35\;{\mu}m$, respectively. Ultrafine particles of the endosperm and the husks dispersed better than larger-sized particles. As time elapsed, the dispersibility decreased, but the ultrafine particles were precipitated at the slowest rate. Our results suggest that ultrafine particles, including future nanosized particles, provide improved solubility and dispersibility resulting in better stability in the food colloidal suspension.

그라비아 케미칼 프린팅 기술을 이용한 고내구성 재귀반사 코팅 직물 제조연구 (Development of Highly Durable Retroreflective Coating with Gravure Chemical Printing)

  • 양성용;김보민;박혜지;김규환;박재형
    • 한국염색가공학회지
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    • 제35권2호
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    • pp.98-106
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    • 2023
  • The recent surge in night walkers and pedestrian traffic accidents has led to an increased interest in retro-reflection-based products, leading to several studies on retro-reflection. Nonetheless, achieving high durability and dispersibility of retro-reflective glass beads in viscous polyurethane coating resin remains challenging. To address this issue, this study conduct to functionalize the surface of glass beads for covalent conjugation to coating resin to enhance their dispersibility and durability in the coating resin. The study evaluated the dispersibility, chemical composition, and retro-reflection properties of the functionalized glass beads and coating resin. The results showed that the functionalized glass beads conjugated to the polyurethane coating resin and exhibited excellent dispersibility, high durability, and maintained retro-reflection efficiency.