• Title, Summary, Keyword: Organic-inorganic composite material

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Microwave Properties of Organic-inorganic Composite Material Antenna with Various Fabrication Method of Conduction Material (전도체 형성 방법에 따른 유무기 복합재료 안테나의 고주파 특성)

  • Park, Sang-Hoon;Seong, Won-Mo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.9
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    • pp.832-837
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    • 2006
  • Antennas were fabricated by physical(adhesive) and chemical(deposition+plating) method on organic-inorganic composite material. And antennas were measured dielectric constant and gain. Dielectric constant of antennas were fabricated by physical method was decreased with increase of adhesive tape thickness and number of conduction material composition. But antennas were fabricated by chemical method was reached to 90 % of dielectric material. Gain of antennas were fabricated by physical method was decreased with increase of adhesive tape thickness. But they were unrelated with conduction material composition. The other side antennas were fabricated by chemical method excelled more 0.8 dBic than antennas were fabricated by physical method in gain of antenna. Finally, chemical method can expect excellent product process because it can produce smaller size, higher gain and elimination of many handworks.

A Study on Organic/Inorganic Materials Deposition Using SAW-ED System (SAW-ED 시스템을 이용한 유/무기 소재 증착에 관한 연구)

  • Kim, Hyun Bum;Kim, Kyung Hwan;Ghayas, Siddiqi;Lim, Jong Hwan;Yang, Hyoung Chan;Choi, Kyung Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.5
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    • pp.100-108
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    • 2016
  • In various industries, many researches studies have been done in using nano thin film fabrication technology. In the field of printed electronics, various electronic devices can be fabricated using a direct printing process of on multiple functional materials. It has the advantages of low prices, environment-friendly environmentally friendly, flexibleility, large scale, mass production produced, simple process and so on. In this study, a viable thin film fabrication technology has beenwas introduced using the surface acoustic wave mechanism for thin film deposition. Fabrication of thin films using organic, inorganic and composite of organic/inorganic materials have been were analyzed through the experimental research. In this experiment, organic material MEH:PPV, inorganic material ZnO and composite material MEH:PPV/ZnO have been depo sited as thin films.

Bio-Inspired Synthesis of a Silicate/PMMA Composite

  • Nam, Kyung Mok;Lee, Yoon Joo;Kwon, Woo Teck;Kim, Soo Ryong;Shin, Dong-Geun;Lim, Hyung Mi;Kim, Hyungsun;Kim, Younghee
    • Journal of the Korean Ceramic Society
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    • v.51 no.1
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    • pp.7-10
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    • 2014
  • Abalone shell is composed of 95 wt% $CaCO_3$ platelets and 5 wt% of a protein-rich organic matrix which acts as an adhesive layer, connecting aragonite tablets, thus maintaining the structural integrity of the composite. By mimicking abalone shell, we prepared a silicate plate/polymer nanocomposite by infiltrating PMMA between silicate layers and warm-pressing them at $200^{\circ}C$ for 1 h under 15 tons to make organic-inorganic composite materials. To examine the organic-inorganic composite materials after the warm-pressing procedure, the composite sample was analyzed with FE-SEM and TG. The bending strengths and densities of the composites prepared by a silicate plate and PMMA after the warm-pressing process were ~140 MPa and 1.5, respectively.

Biomimetic Preparation of Boron Nitride /PMMA Composite (생체모방기술을 이용한 Boron Nitride /PMMA 복합체 제조)

  • Nam, Kyung Mok;Lee, Yoon Joo;Kim, Bo Yeon;Kwon, Woo Teck;Kim, Soo Ryong;Shin, Dong Geun;Kim, Young Hee
    • Journal of the Korean Ceramic Society
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    • v.51 no.2
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    • pp.103-106
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    • 2014
  • Nacre is an organic-inorganic composite material; it is composed of $CaCO_3$ platelet and protein. The microstructure of nacre is a matrix that is similar to bricks and mortar. Technology inspired by nature is called biomimetic technology. In this study, to make high thermal conducting ceramic composite materials using biomimetic technology, a porous green body was prepared with BN platelets. PMMA was infiltrated into the porous green body to make a composite. The microstructure of the composite was observed with FESEM, and the thermal properties were measured. The thermal conductivity of the prepared organic-inorganic composite was 4.19 $W/m{\cdot}K$.

Study on Water Vapor and Oxygen Transmission Rates in Inorganic Composite Films to improvement life-time of OLEDs (유기EL의 수명향상을 위한 혼합무기박막의 투습율 및 투산소율 특성 연구)

  • Kim, Young-Min;Lee, Joo-Won;Kim, Jong-Moo;Park, Jung-Soo;Sung, Man-Young;Jang, Jin;Ju, Byeong-Kwon;Kim, Jai-Kyeong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.189-192
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    • 2004
  • To improvement life-time of the organic light emitting diodes(OLEDs). We investigate the inorganic composite film based on MgO and $SiO_2$ to protect from the moisture and oxygen. The inorganic composite films are added the base materials to the co-operate materials using the mixed process and it is deposited on plastic substrate by e-beam evaporator. In order to analyze as kinds of inorganic materials, Water Vapor method of Transmission Rate (WVTR) and Oxygen Transmission Rate (OTR) are measured by Permatran equipment(MOCON Corp.). For comparison. an MgD- and $SiO_2$-based composite film has lower values of WVTR and OTR than inorganic composite/compound films of ones. The results obtained here shows that this film is suitable for passivation layer to extend the life-time of OLEDs.

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Permeation Properties of Composite Thin Film for Organic Based Electronic Devices

  • Kim, Kwang-Ho;Kim, Hoon;Lee, Joo-Won;Kim, Jai-Kyeong;Ju, Byeong-Kwon;Jang, Jin;Oh, Myung-Hwan;Han, Jeong-In
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.920-923
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    • 2003
  • We fabricated composite materials as a pellet structure with the various kinds of inorganic material powder. The composite materials were deposited onto the plastic film by the electron beam evaporation and water vapor transmission rates (WVTRs) were measured by the MOCON facility. As a result of WVTRs, the composite materials had lower WVTR value than any other inorganic materials. So, these films were proposed to protect the organic light emitting device (OLED) from moisture and oxygen. We can consider that the composite thin-film is one of the more suitable candidates for the thin-film passivation layer in the OLED. And, we are processing the XRD, XPS and EPMA to analyze the property of the composite material. We will also analyze properties of the current-voltage and luminescence for lifetime both the composite thin-film passivated OLED and non-passivated OLED.

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Proton Conductivity and Methanol Transport Behaviour of PVdF/SPEEK/$TiO_2$ Hybrid Membrane (PVdF/SPEEK/$TiO_2$ 하이브리드 막의 프로톤 전도도 및 메탄올 전이현상)

  • You, Sun-Kyung;Kalappa, Preshantha;Park, Soo-Gil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.409-411
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    • 2005
  • A series of inorganic-organic hybrid membranes were prepared with a systematic variation of titanium dioxidenanoparticles content. Their water uptake, methanol permeability and proton conductivity as a function of inorganic oxide content were investigated. The results obtained show that the inorganic oxide network decreases the proton conductivity and water swelling. It is also found that increase in inorganic oxide content leads to decrease of methanol permeability. In terms of the morphology, membranes are homogeneous and exhibit a good adhesion between inorganic domains and the polymer matrix. The properties of the composite membranes are compared with the standard nation membrane.

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Properties of Nano-Hybrid Coating Films Synthesized from Colloidal Silica-Silane (콜로이달 실리카와 실란으로부터 합성된 나노하이브리드 코팅 박막의 특성)

  • Na, Moon-Kyong;Ahn, Myeong-Sang;Kang, Dong-Pil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.232-233
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    • 2006
  • In recent years the interest in organic/inorganic hybrid materials has increased at a fast rate. Nano organic-inorganic hybrid composites have shown advantages for preparing hard coating layers. Especially, nano hybrid composite has low environmental pollution. It has high transparency, hardness, toughness, thermal dissociation temperature, hydrophobicity by using nano sized inorganic material. There are many ways in which these materials may be synthesized, a typical one being the use of silica and silanes using the sol-gel process. The structure of sol-gel silica evolves as a result of these successive hydrolysis and condensation reactions and the subsequent drying and curing. The sol-gel reactions are catalyzed by acids and produce silica sol solutions. The silica sol grows until they reach a size where a gel transition occurs and a solid-like gel is formed. Colloidal silica(CS)/silane sol solutions were synthesized in variation with parameters such as different acidity and reaction time. In order to understand their physical and chemical properties, sol-gel coating films were fabricated on glass. From all sol-gel solutions, seasoning effect of sol-gel coating layer on glass was observed.

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Deposition of Functional Organic and Inorganic Layer on the Cathode for the Improved Electrochemical Performance of Li-S Battery

  • Sohn, Hiesang
    • Korean Chemical Engineering Research
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    • v.55 no.4
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    • pp.483-489
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    • 2017
  • The loss of the sulfur cathode material through dissolution of the polysulfide into electrolyte causes a significant capacity reduction of the lithium-sulfur cell during the charge-discharge reaction, thereby debilitating the electrochemical performance of the cell. We addressed this problem by using a chemical and physical approach called reduction of polysulfide dissolution through direct coating functional inorganic (graphene oxide) or organic layer (polyethylene oxide) on electrode, since the deposition of external functional layer can chemically interact with polysulfide and physically prevent the leakage of lithium polysulfide out of the electrode. Through this approach, we obtained a composite electrode for a lithium-sulfur battery (sulfur: 60%) coated with uniform and thin external functional layers where the thin external layer was coated on the electrode by solution coating and drying by a subsequent heat treatment at low temperature (${\sim}80^{\circ}C$). The external functional layer, such as inorganic or organic layer, not only alleviates the dissolution of the polysulfide electrolyte during the charging/discharging through physical layer formation, but also makes a chemical interaction between the polysulfide and the functional layer. As-formed lithium-sulfur battery exhibits stable cycling electrochemical performance during charging and discharging at a reversible capacity of 700~1187 mAh/g at 0.1 C (1 C = 1675 mA/g) for 30 cycles or more.