• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
• /
• pp.714-717
• /
• 2004

알루미노 보로실리케이트계 유리 기본조성 중 알칼리 토류 산화물의 종류 및 함량 변화에 따른 저유전율/저 LTCC 배선 기판의 저온 소성 거동 및 유전 특성을 조사하였다 알칼리 토류 산화물의 종류 및 함량 변화를 통해서 LTCC의 적정 소성온도인 $875^{\circ}C$ 부근을 포함하는 넓은 대역으로 소성수축이 시작되는 온도를 제어할 수 있었으며 유리 프리트와 알루미나 필러의 배합 비율의 변화에 따른 소성거동 및 유전특성의 변화 거동을 조사하였다. 알칼리 토류 산화물 중 유리 조성내의 CaO의 함량이 증가할수록 유리전이점 및 연화점을 증가하는 경향을 보였으며, 알루미나 필러의 첨가량이 증가할수록 소성수축이 시작되는 온도영역은 상향되고 유전율 및 품질계수는 증가하였다. 알칼리 토류 산화물의 조성과 필러인 알루미나의 함량을 제어함으로서 $875^{\circ}C$에서 18% 이상의 선수축율과 유전율 $5.1\sim5.5$ 및 유전손실 0.1% 이하의 우수한 특성을 갖는 저온소결용 LTCC 배선 기판을 얻을 수 있었다.

• 한국재료학회지
• /
• 제9권8호
• /
• pp.804-809
• /
• 1999

테오스(TEOS)를 출발물질로 사용하여 건조조절제(DCCA;Dying Control Chemical Additives)를 첨가하지 않고, 솔-젤 법을 이용하여 Si(001) 단결정 기판 위에 실리카 박막을 제조하였다. 박막은 스핀 코팅 방법으로 테오스 =1 몰, 염산=0.05몰의 조건하에 메탄올, 증류수의 첨가량을 변화시키면서 젤화 완료시간, 박막의 두께, 균열 발생 여부, 박막의 결정성 등을 조사하였다. 그 결과 솔의 제화 완료시간은 메탄올 첨가량이 8몰일 때 가장 긴 640시간이었다. 코팅된 박막의 두께는 메탄올 첨가량이 많아질수록 감소하였다. 소결은 승온 속도$0.6^{\circ}C$/min으로 $500^{\circ}C$에서 1시간 행하였으며, 메탄올 첨가량이 0.8몰, 2몰일 때는 표면에서 균열이 발생하여 worm-like grain 구조를 가졌고, 메탄올 4몰인 경우에는 국부적으로 균열이 발생하였으나, 메탄올 양이 8몰 이상에서는 균열이 발생하지 않았다. 즉, 솔-젤 공정에서 균열 방지를 위해 첨가되는 건조조절제(DMF)를 첨가하지 않고도 용매인 메탄올과 증류수 혼합비를 조절, 표면장력을 제어함으로써 균열없는 박막을 제조하였다.

• Macromolecular Research
• /
• 제12권6호
• /
• pp.564-572
• /
• 2004

Modem applications could benefit from multifunctional materials having anisotropic optical, electrical, thermal, or mechanical properties, especially when coupled with locally controlled distribution of the directional response. Such materials are difficult to engineer by conventional methods, but the electric field-aided technology presented herein is able to locally tailor electroactive composites. Applying an electric field to a polymer in its liquid state allows the orientation of chain- or fiber-like inclusions or phases from what was originally an isotropic material. Such composites can be formed from liquid solutions, melts, or mixtures of pre-polymers and cross-linking agents. Upon curing, a 'created composite' results; it consists of these 'pseudofibers' embedded in a matrix. One can also create oriented composites from embedded spheres, flakes, or fiber-like shapes in a liquid plastic. Orientation of the externally applied electric field defines the orientation of the field-aided self-assembled composites. The strength and duration of exposure of the electric field control the degree of anisotropy created. Results of electromechanical testing of these modified materials, which are relevant to sensing and actuation applications, are presented. The materials' micro/nanostructures were analyzed using microscopy and X-ray diffraction techniques.

• 한국복합재료학회:학술대회논문집
• /
• 한국복합재료학회 2004년도 추계학술발표대회 논문집
• /
• pp.65-68
• /
• 2004

A new multifunctional sandwich composite was investigated in this paper. The honeycomb core of this composite was filled with viscoelastic material in order to obtain an improved impact performance. The fillings in the honeycomb cells was hoped to provide the act of energy dissipation in this combined material system. Low-velocity drop-weight test was set up to the specimens with various stacked carbon/epoxy laminate facesheets, $[0/90]_{4s},\;[0/45/-45/90]_{2s}$. Load and energy history were checked and compared for the both groups of specimens, with and without rubber fillings. Further, the damaged faces were inspected visually by ultrasonic C-scan.

• 한국세라믹학회지
• /
• 제38권10호
• /
• pp.876-880
• /
• 2001

The supported and unsupported boehmite ($\gamma$-AlOOH) membranes were prepared using a boehmite sol. The supported membrane was consisted of a porcelain support, two intermediate $\alpha-{Al_2}{O_3}$ layers, and a top boehmite membrane. XRD patterns showed that the supported top membrane had a higher $\theta-$ to $\alpha-{Al_2}{O_3}$ transformation temperature compared to the unsupported membrane. This result was also confirmed from microstructural study of the membrane. The shift in the phase transformation temperature should be explained by difference of a stress generated in the supported top membrane due to interaction between the support layers and the top membrane.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
• /
• pp.348-348
• /
• 2008

In recent, the concept of system-on-package (SOP) for highly integrated multifunctional systems has been paid attention to for the miniaturization and high frequency of electronic devices. In order to realize SOP, co-integration of passive devices, such as capacitors, resistors and inductors, and active devices should be achieved. If ceramic thick films can be grown at room temperature, we expect to be able to overcome many problems in conventional fabrication processes. So, we focused on the aerosol deposition method (ADM) as room temperature fabrication technology. ADM is a novel ceramic coating method based on the Room Temperature Impact Consolidation (RTIC) phenomena. This method has a wide range potential for fabrication of co-integration of passive and active devices. In this paper, I will present the future potential of ADM introducing various ceramic dielectric thick films for the integration of electronic ceramics.

• Korean Chemical Engineering Research
• /
• 제46권1호
• /
• pp.7-14
• /
• 2008

탄소나노튜브는 전기적, 기계적, 열적 특성면에서 모두 탁월한 물성을 나타냄에 따라 복합체 분야에서 가장 이상적인 나노충전재료로 여겨지고 있다. 그에 따라 탄소나노튜브 복합체는 전도성재료, 고강도 경량 특성의 구조재료, 다기능 복합재료 등의 응용에 있어서 그 활용도가 높아지고 있다. 본 총설에서는 탄소나노튜브의 제조방법, 개질, 탄소나노튜브 복합체의 다양한 특성 및 응용 분야에 대한 최근 연구 동향을 설명하고 탄소나노튜브 복합체 상업화에 있어서 앞으로 나아갈 방향에 대하여 다룬다.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
• /
• pp.426-427
• /
• 2005

This research describes a new constructing method of multifunctional biosensor using many kinds of biomaterials. A metal particle and an array was fabricated by photolithographic. Biomaterials were immobilized on the metal particle. The array and the particles were mixed in a buffer solution, and were arranged by magnetic force interaction and self-assembly. A quarter of total Ni dots were covered by the particles. The binding direction of the particles was controllable, and condition of particles was almost with Au surface on top. The particles were successfully arranged on the array. The biomaterial activities were detected by chemiluminescence and electrochemical methods.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
• /
• pp.404-405
• /
• 2006

Microarray-based DNA chips provide an architecture for multi-analyte sensing. In this paper, we report a new approach for DNA chip microarray fabrication. Multifunctional DNA chip microarray was made by immobilizing many kinds of biomaterials on transducers (particles). DNA chip microarray was prepared by randomly distributing a mixture of the particles on a chip pattern containing thousands of m-scale sites. The particles occupied a different sites from site to site. The particles were arranged on the chip pattern by the random fluidic self-assembly (RFSA) method, using a hydrophobic interaction for assembly.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
• /
• pp.472-475
• /
• 2004

Microarray-based DNA chips provide an architecture for multi-analyte sensing. In this paper, we report a new approach for DNA chip microarray fabrication. Multifunctional DNA chip microarray was made by immobilizing many kinds of biomaterials on transducers (particles). DNA chip microarray was prepared by randomly distributing a mixture of the particles on a chip pattern containing thousands of m-scale sites. The particles occupied a different sites from site to site. The particles were arranged on the chip pattern by the random fluidic self-assembly (RFSA) method, using a hydrophobic interaction for assembly.