• Title/Summary/Keyword: nanoclay

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Experimental evaluation of the performance of self-compacting concrete contains nano clay and nano egg shell

  • Hilal, Nahla N.;Hadzima-Nyarko, Marijana
    • Advances in concrete construction
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    • v.13 no.5
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    • pp.349-360
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    • 2022
  • The rising prices of landfills and the lack of cement production are motivating researchers to be more interested in using wastes to produce concrete mixtures materials. The use of waste materials such as eggshell and matakoline waste not only reduces landfill costs and space, but also reduces the cost of cement production for the concrete mixture. However, recycling waste materials has become critical in order to effectively manage environmental sustainability. The purpose of this paper is to investigate the appropriate properties of self-compacting concrete (SCC) by incorporating waste materials such as crushed ceramics as coarse aggregate and nano egg shell (NES) and nanoclay (NC) as cement replacements. Fresh properties of SCC, such as segregation, flow time and diameter, V-funnel, H2/H1 ratio, and fresh unit weight of concrete mixtures, as well as hardened properties, such as 7, 14, and 28 days compressive strength and 28 and 90 days flexural strength, were measured for this purpose. The presence of NC in the SCC mixture enhanced the compressive strength of the concrete when 5% of NES was added or in the case without the addition of NES compared to the control mixture. The flexural strength enhanced with the incorporation of NC in the SCC increased the flexural strength of the concrete compared to the control mixture, but the incorporation of 5% of NES decreased the flexural strength compared to the mixtures with NC. These results prove the possibility of using crushed ceramics as the coarse aggregate, and NES and NC as substitutes for 5, 7, and 10% of the cement in SCC, because the properties of such SCC in hardened and fresh states are satisfactory.

Hybrid Nanocomposites: Processing and Properties

  • Shi, Y.;Kanny, K.;Jawahar, P.
    • Advanced Composite Materials
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    • v.18 no.4
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    • pp.365-379
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    • 2009
  • Epoxy/S2-glass reinforced composites (SGRPs) infused with Cloisite 30B nanoclays were manufactured using the vacuum assisted resin infusion molding (VARIM) process. Prior to infusion, the matrix and clays were thoroughly mixed using a direct mixing technique (DMT) and a high shear mixing technique (HSMT) to ensure uniform dispersion of the nanoclays. Structures with varying clay contents (1-3 wt%) were manufactured. Both pristine and SGRP nanocomposites were then subjected to mechanical testing. For the specimens manufactured by DMT, the tensile, flexural, and compressive modulus increased with increasing the clay content. Similarly, the tensile, flexural, compressive, interlaminate shear and impact strength increased with the addition of 1 wt% clay: however the trend reversed with further increase in the clay content. Specimens manufactured by HSMT showed superior properties compared to those of nanocomposites containing 1 wt% clay produced by DMT. In order to understand these phenomena a morphological study was conducted. Transmission electron microscopy (TEM) micrographs revealed that HSMT led to better dispersion and changed the nanoclay structure from orderly intercalation to disorderly intercalation giving multi-directional strength.

Thermal, Dielectric Properties Characteristics of Epoxy-nanocomposites for Organoclay of Several Types (여러종류의 Organoclay에 대한 에폭시-나노콤포지트의 열적, 유전특성에 관한 연구)

  • Park, Jae-Jun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.6
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    • pp.538-543
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    • 2008
  • Nanostructured materials are attracting increased interest and application. Exciting perspectives may be offered by electrical insulation. Epoxy/Organoclay nanocomposites may find new and upgraded applications in the electrical industry, replacing conventional insulation to provide improved performances in electric power apparatus, e.g, high voltage motor/generator stator winding insulation, dry mold transformer, etc. In the paper work, the electrical and thermal properties of epoxy/organoclay nanocomposites materials were studied. The electrical insulation characteristics were analyzed through the permittivity characteristics. by analyzing the permittivity spectra, it was found that dielectric constant becomes smaller with increase frequency and becomes larger with increase temperature. This indicates restriction of molecular motion and strong bonds at the epoxy/organoclay nanocomposites. The morphology of nanocomposites obtained was examined using TEM and X-ray diffraction. It has been shown that the presence of polar groups leads to an increased gallery distance and partial exfoliation. Nevertheless, full exfoliation of clay platelets has not been achieved.

Migration of Nanoclay in Immiscible Polymer Blends

  • Kim, Yong-Kyoung;Ahn, Kyung-Hyun;Lee, Seung-Jong;Hong, Joung-Sook
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.366-366
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    • 2006
  • Five sandwiched multilayers consisting of PBT(Polybutyleneterephthalate), PS(Polystyrene) and clay were prepared to investigate the migration mechanism of clay in the polymer blend system. Rheometry (RMS800) was used to apply well-defined shear on the above multilayer samples in order to well understand dominant factors controlling the migration. Applied shear force was enough to move clay tactoids to the interface, if either long time or high shear was available, but it was not sufficient to separate into individual platelets of clay. The morphology evolution was subsequently studied in term of scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HR-TEM), respectively.

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Improving the Properties of Industrial Polyurethane with Nanoclay, Hectorite

  • Seydibeyoglu, M.O.;Guner, F.S.;Ece, I.;Isci, S.;Gungor, N.
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.281-281
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    • 2006
  • In this study, the polyurethane which has versatile applications has been reinforced with the natural clay, hectorite. The hectorite has better properties than montmorillonite. There are studies on polyurethane and montmorillonite but polyurethane and hectorite composite is published first time. Polyurethane is industrial polyurethane which makes the study to be applicable to the industry. Exfoliated structure has been obtained without using organic modifiers due to the hydrophilic nature of the polymer matrix and the mineral clay. Mechanical properties have been improved as well.

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Structural and Dielectric Properties of Epoxy-Organoclay Nanocomposites using Power Ultrasonic Dispersion (초음파 분산을 이용한 Epoxy-Organoclay 나노콤포지트 구조적 그리고 유전특성에 관한 연구)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.9
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    • pp.1572-1578
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    • 2008
  • The effect of the organoclay_10A nanoparticles on the DSC and Structural and Dielectrics Properties(1Hz-1MHz) for epoxy/Organoclay_10A Nanocomposites has been studied. Dielectric properties of epoxy-Organoclay nanocomposites were investigated at 1, 3, 5, 7, 9 filler concentration by weight. Epoxy nanocomposites samples were prepared with good dispersion of layered silicate using power ultrasonic method in the particles. As structural analysis, the interlayer spacing have decreased with filled nanoparticles contents increase using power ultrasonic dispersion. The maximum increase interlayered spacing was observed to decease for above 5wt% clay loading. The other hand, as decrease with concentration filler of the layered silicate were increased dispersion degree of nanoparticles in the matrix. The interesting dielectric properties for epoxy based nanocomposites systems are attributed to the large volume fraction of interfacesin the bulk of the material and the ensuring interactions between the charged nanoparticle surface and the epoxy chains.

Evaluation of physical properties and non-flammability of Nylon6 using melamine-based halogen-free flame retardant. (멜라민계 난연제를 이용한 Nylons 의 난연성 및 물리적 특성 평가)

  • Kim Dong-Hak;Ryu Kwan-Suk
    • Proceedings of the KAIS Fall Conference
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    • 2004.11a
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    • pp.296-298
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    • 2004
  • 본 연구에서는 압출성형에서 Nylon6 를 기재로 멜라민계 난연제를 사용하여 난연성 및 물성평가를 비교, 분석하였다. 멜라민계 난연제를 선택한 이유는 탈할로겐화 추세에 일조를 하며 연기가 적고, 생분해를 하는 물질이기 때문에 큰 장점이 있다. 또한 새로운 제품 및 적용범위를 발굴하기가 상대적으로 용이하다는 장점이 있기 때문에 멜라민계 난연제를 선택하였다. 난연 Test는 UL-94 측정방법을 이용하였고 물성평가는 UTM 측정기기로 인장강도, 연신율, 굴곡강도, 굴곡탄성율 측정하였다. 또 충격강도 시험기로 충격강도를 측정하였고, 물성평가 경우에는 난연제로 인한 물성저하를 최소화 하기위해 Nano-clay 를 첨가하여 비교하였다. 연구결과는 난연 Test 경우 난연제의 함량이 $5wt\%$ 이상이면 V0급으로 나왔고 물성평가에서는 Nanoclay를 첨가한 실험이 물성저하를 대처할 수 있을 정도의 결과로 보여 진다.

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Thermal, Electrical Characteristics according to Contents Variation of Epoxy/Organoclay Nanocomposites for High Voltage Insulation (고압절연용 Epoxy/Organoclay Nanocomposites의 열적, 전기적 특성에 관한 연구)

  • Park, Jae-Jun;Ahn, Ju-No
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.11a
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    • pp.226-227
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    • 2007
  • Nanostructured materials are attracting increased interest and application. Exciting perspectives may be offered by electrical insulation. Epoxy/Organoclay nanocomposites may find new and upgraded applications in the electrical industry, replacing conventional insulation to provide improved performances in electric power apparatus, e.g, high voltage motor/generator stator winding insulation, dry mold transformer, etc. This paper shows that electrical and thermal properties of epoxy/organoclay nanocomposites insulating materials for dsc, dielectric constant, I-V characteristics, breakdown volatge, can improve significantly with respect to the basic, virgin materials.

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Tensile, Thermal and Morphological Properties of Ballmilled Clay/Wood Flour Filled Polypropylene Nanocomposites

  • Lee, Sun-Young;Kang, In-Aeh;Chun, Sang-Jin
    • Journal of the Korean Applied Science and Technology
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    • v.25 no.2
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    • pp.160-167
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    • 2008
  • Nanocomposites with polypropylene/clay/wood flour were prepared by melt blending and injection molding. Thermal, mechanical and morphological properties were characterized. The addition of ballmilled clay, compatibilizer and wood flour significantly improved the thermal stability of the hybrids. The tensile modulus and strength of most hybrids was highly increased with the increased loading of clay, maleated polypropylene (MAPP) and wood flour (WF), compared to the PP/WF hybrids. The tensile modulus and strength of most hybrids were highly increased with the increased loading of ballmilled clay, MAPP and wood flour, compared to the hybrids with PP/WF. The transmission electron microscopy (TEM) photomicrographs illustrated the intercalated and partially exfoliated structures of the hybrids with ballmilled clay, MAPP and wood flour.

Development of surface functional coating thin film utilizing combined processes of plasma activation surface treatment and nanoclay dispersion: In applications for transparent water vapor and oxygen barrier packaging films (플라즈마 활성화 표면처리 공정과 나노클레이 분산 적층 코팅을 이용한 표면 기능성 코팅 박막 개발: 수분 및 산소 차단성이 우수한 투명 포장재)

  • Nam Il Kim;Geug Tae Kim
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.33 no.3
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    • pp.97-103
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    • 2023
  • Barrier films for transparent packaging materials with excellent moisture barrier properties are prepared, utilizing a nanoclay dispersion coating layer formed after a pretreatment process of plasma activation surface treatment process under vacuum at room temperature. Attention is paid on optimizing the coupling additive through the appropriate crosslinking process and optimal dispersion process of the coating process to enhance adhesion. Analysis of the functional coating thin film shows that the water vapor transmission rate is less than 10 g/m2/24 hrs (ASTM F-1249) and the oxygen transmission rate is less than 30 cc/m2/24 hrs (ASTM D3985). It is shown that water barrier properties of coating thin film prepared in this study are greater than conventional untreated films by 10 times or more. The thickness of the transparent gas barrier film is within 0.1 mm, and the transparent gas barrier complex is implemented in two layers. In the study of PET thin film interface characteristics, FT-IR experimental analysis shows the reaction activity was optimized at RDS 1.125 %.