• 한국세라믹학회지
• /
• 제54권3호
• /
• pp.222-227
• /
• 2017

Flake-type micro hollow silica was synthesized by precipitation method using an $Mg(OH)_2$ inorganic template and sodium silicate and ammonium sulfate as the silica precursors. We investigated the effects of the silica precursor concentration on the shape, shell thickness, and surface of the hollow silica. When the concentration of the silica precursor was 0.5 M, the hollow silica had a smooth and translucent thin shell, but the shell was broken. On the other hand, the shell thickness of the hollow silica changed in the range of 12 nm to 18 nm with the increase of the precursor concentration from 0.7 M to 1.1 M. Simultaneously, unintended spherical silica satellites were created on the shell surface. The number of satellites and the size rose according to the increased concentration of silica precursor. The reason for the formation of spherical silica satellites is that the $NH_4OH$ nucleus generated in the synthesis of hollow silica acted as another silica reaction site.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 2부
• /
• pp.105-109
• /
• 2011

This study is concerned with the development of the SL inorganic floor covering. First, volatile organic compounds, inorganic test profile on the SL through the flooring is environment-friendly inorganic noncombustible floor finishes the event of fire toxic gases (such as volatile organic compounds) emissions have been identified as not at all. Second, SL-breathable material, the concrete floor to prevent aging, long life, which are three levels of noise, shock-absorbing function was decreased. Third, SL economic analysis of mineral flooring terrazzo tile floors compared with the normal material. On a terrazzo tile cost 13,500 won ~ 24,500 won, but It have found that, in terms of labor SL 36,899 won ~ 38,899 won flooring mineral balance. Occurs in the total amount when compared with terrazzo tile floors and 25,399 won 3T, 5T and economical analysis concludes that the original 12,399 won.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
• /
• pp.221-226
• /
• 2001

Chloride diffusion effect of cement paste, freezing and thawing test, carbonation of concrete specimen were carried out using inorganic coating material. According to the chloride ions diffusion test, it is elucidated that permeability and diffusion coefficient of Cl￣ ions and apparent coefficient of coated cement paste is smaller than plain cement paste. A durability of coated concrete specimen was enhanced by the experiment result of concrete carbonation and freezing thawing test.

• 한국염색가공학회:학술대회논문집
• /
• 한국염색가공학회 2009년도 학술발표대회
• /
• pp.116-117
• /
• 2009

In this study, As a previous stage to manufacture disposable tent for military camouflage, we examine possibility of inorganic material absorption on PET surface. In order to, we created unevenness by sputtering process on PET surface and made absorption with Zirconium (ZIA) that has nano particles. and we went on study to its effect.

• Corrosion Science and Technology
• /
• 제14권2호
• /
• pp.64-75
• /
• 2015

Single $TiO_2$ coating prepared by sol-gel process usually experiences cracks in coating layer. In order to prevent cracks, an inorganic-organic hybrid $TiO_2-SiO_2$ coating was synthesized by combining precursors with an organic functional group. Five different coatings with various ratios of (1:8, 1:4, 1:1, 1:0.25 and 1:0.125) titanium alkoxide (TBOT, Tetrabutylorthotitanate) to organo-alkoxysilane (MAPTS, ${\gamma}$-Methacryloxy propyltrimethoxysilane) on carbon steel substrate were made by sol-gel dip coating. The prepared coatings were analyzed to study the coating properties (surface crack, thickness, composition) by scanning electron microscope (SEM), focused ion beam (FIB), and Fourier transform infrared spectroscopy (FT-IR). Potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) were also performed to evaluate the corrosion characteristics of the coatings. Crack free $TiO_2-SiO_2$ hybrid coatings were prepared with the optimization of the ratio of TBOT to MAPTS. The corrosion rates were significantly decreased in the coatings for the optimized precursor ratio without cracks.

• 한국세라믹학회지
• /
• 제42권8호
• /
• pp.532-536
• /
• 2005

Thermal shock resistance of structural ceramics is a property that is difficult to quantity, and as such is usually expressed in terms of a number of empirical resistance parameters. These are dependant on the conditions imposed, but one method that can be used is the examination of density, Young's modulus and thermal expansion retention after quenching. For high temperature applications, long-annealing thermal durability, cycle thermal stability and residual mechanical properties are very important if these materials are to be used between $1000^{\circ}C$ and $1300^{\circ}C$. In this study, an excellent thermal shock-resistant material based on $Al_2TiO_5-mullite$ composites of various compositions was fabricated by sintering reaction from the individual oxides and adjusting the composition of $Al_2O_3TiO_2/SiO_2$ ratios. The characterization of the damage induced by thermal shock was done by measuring the evolution of the Young's modulus using ultrasonic analysis, density and thermal expansion coefficients.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
• /
• pp.197-199
• /
• 1987

This paper is investigated on characteristics of photoresist using inorganic a-$Se_{75}Ge_{25}$. The sensitivity of negative photoresist showing insolubility against alkalie solution, with Ag-photodoped, is more prominent than that of positive photoresist used with only a-$Se_{75}Ge_{25}$. It is also showed that the contrast of negative photoresist, ${\gamma}=2.9$, is more prominent than that of positive photoresist, ${\gamma}=1.4$.

• 한국재난정보학회 논문집
• /
• 제12권3호
• /
• pp.292-299
• /
• 2016

건축물에서 단열재는 매우 중요하다. 건축물에 사용하는 단열재는 재료에 따라 유기단열재와 무기단열재로 크게 나누는데 스티로폼이나 우레탄으로 만들어진 유기단열재는 화재에 매우 취약하다. 반면 펄라이트 무기단열재는 불연재이나 습기에 매우 취약하여 사용범위가 제한적이다. 본 연구에서는 단열성능이 보드의 두께가 50mm 이내의 샘플에서 열전도율과 흡수율은 각각 0.05W/mk, 3.0% 이하, 휨강도와 발수율은 각각 $25N/cm^2$, 98% 이상인 무기단열재를 개발하고 열전도 특성을 평가하였다.

• 한국건설순환자원학회논문집
• /
• 제6권4호
• /
• pp.236-244
• /
• 2018

본 연구에서는 시멘트 복합재료와 직접 혼합 가능한 액상 무기재료 활용 자기치유 마이크로 캡슐을 제조하고자 하였다. 액상 무기재료의 기초특성을 평가하였으며, 마이크로 캡슐화를 수행하였다. 또한 본 논문의 포커스는 자기치유 마이크로 캡슐의 치유 효과보다는 시멘트 복합재료에 적용하기 위한 품질 및 제조 특성에 대하여 검토하였다. 자기치유 마이크로 캡슐은 상온에서 안정하고 균열 추종성이 큰 액상 무기재료를 캡슐화하였으며, 수득률은 90% 이상으로 나타났다. 자기치유 마이크로 캡슐의 크기는 합성 교반 속도에 따라 크기를 변화할 수 있었으며, 목표 크기에 대하여 70% 이상 확보할 수 있었다. 또한 자기치유 마이크로 캡슐의 막강화를 통하여 10% 이내의 손실량이 발생하는 것으로 나타났으며, 막 강화를 하지 않은 것과 비교하여 50% 저감할 수 있었다.

• 콘크리트학회논문집
• /
• 제25권3호
• /
• pp.261-269
• /
• 2013

이 연구에서는 산업부산물인 고로슬래그 미분말과 알칼리 활성화제(물유리, 수산화나트륨)를 사용하였다. 또한, 이를 활용하여 철근콘크리트 보에 적용하여 휨성능 평가를 하였다. 주요변수는 W/B, 알칼리 활성화제의 혼입비율, 혼화재의 종류 및 혼입유무로서 총 8개의 실험체를 제작하였으며, 재료 및 구조성능 평가를 위한 실험을 수행한 결과 다음과 같은 결론을 얻었다. 친환경 무기결합재 콘크리트는 초기 경화속도가 빠르며, 고강도 콘크리트의 가능성을 보였다. 또한, 이를 활용한 철근콘크리트 보는 기존 시멘트를 사용한 철근콘크리트 보와 유사한 거동과 파괴양상을 보였다. 친환경 무기결합재 콘크리트가 시멘트 콘크리트를 대체할 수 있는 기초연구로서 향후 건설소재 및 재료분야에 활용할 수 있을 것으로 사료되며, 이러한 특성을 바탕으로 콘크리트 2차 제품 생산과 구조부재를 PC화하여 활용할 경우 생산성 향상, 공기단축 등 효율이 상승될 것으로 보인다.