• Advances in nano research
• /
• 제10권2호
• /
• pp.191-210
• /
• 2021

To compare the antifungal effect of two nanomaterials (NMs), nanoparticles of zinc oxide were synthesized by a chemical route and zinc oxide-based nanobiohybrids were obtained using green synthesis in an extract of garlic (Allium sativum). The techniques of X-Ray Diffraction (XRD), Infrared (IR) and Ultraviolet Visible (UV-Vis) absorption spectroscopies and Scanning (SEM) and Transmission Electron Microscopies (TEM) were used to determine the characteristics of the nanomaterials synthesized. The results showed that the samples obtained were of nanometric size (< 100 nm). To compare their antifungal capacity, their effect on Cercospora sp. was evaluated. Test results showed that both nanomaterials had an antifungal capacity. The nanobiohybrids (green route) gave an inhibition of fungal growth of ~72.4% while with the ZnO-NPs (chemical route), inhibition was ~87.1%. Microstructural studies using High Resolution Optical Microscopy (HROM) and ultra-structural analysis using TEM carried out on the treated strains demonstrated the effect of the nanofungicides on the vegetative and reproductive structures, as well as on their cell wall. To account for the antifungal effect presented by ZnO-NPs and ZnO nanobiohybrids on the fungi tested, effects reported in the literature related to the action of nanomaterials on biological entities were considered. Specifically, we discuss the electrical interaction of the ZnO-NPs with the cell membrane and the biomolecules (proteins) present in the fungi, taking into account the n-type nature of the ZnO semiconductor and the electrical behavior of the fungal cell membrane and that of the proteins that make up the protein crown.

• Bulletin of the Korean Chemical Society
• /
• 제31권11호
• /
• pp.3451-3453
• /
• 2010

• 동굴
• /
• 제85호
• /
• pp.21-24
• /
• 2008

The chlorophyta and thebryophyta are became extinct by the shutting out the light and low temperature in caves. Whenever they get the conditions, they grow again immediately. It is necessary to keep the illumination distance over 2m and use the indirect light. The effect of lamp light and temperature is very important in the control of green contamination but the water and moisture in caves are essential factors in green contamination in the show caves. It's better to get rid of green alae and mosses at early stage for the control of the increase of green contamination. They must be isolated completely without the dispersion with moist pieces of cloth or sponge. It is necessary to shut out the cave route periodically for the restoration of cave environments and ecosystem. It's better to use the lamp keeping illumination and restricting the ascension of heat for the control of green contamination.

• Bulletin of the Korean Chemical Society
• /
• 제34권5호
• /
• pp.1388-1390
• /
• 2013

Macroporous $SnO_2$ foam was successfully synthesized via a simple soft-chemical route by hybridization between alkylamine and tin(IV) oxide. According to X-ray diffraction (XRD) analysis, the as-prepared $SnO_2$ foam had a highly ordered lamella structure along the crystallographic c-axis, which transformed to a rutile phase after thermal treatment at $300^{\circ}C$. X-ray absorption spectroscopy (XAS) at the Sn K-edge revealed that $SnO_2$ particles in the hybrid material maintained their nanosized structure after hybridization with alkylamine. Scanning electron microscope (SEM) images clearly showed that the as-prepared $SnO_2$ foam had a macroporous structure. This synthetic route can be extended to the development of open frameworks with good electrochemical properties in battery applications.

• Journal of Electrochemical Science and Technology
• /
• 제2권3호
• /
• pp.157-162
• /
• 2011

We report a simple route for synthesizing multi-dimensional structured silicon anode materials from commercially available bulk silicon powders via metal-assisted chemical etching process. In the first step, silver catalyst was deposited onto the surface of bulk silicon via a galvanic displacement reaction. Next, the silver-decorated silicon particles were chemically etched in a mixture of hydrofluoric acid and hydrogen peroxide to make multi-dimensional silicon consisting of one-dimensional silicon nanowires and micro-scale silicon cores. As-synthesized silicon particles were coated with a carbon via thermal decomposition of acetylene gas. The carbon-coated multi-dimensional silicon anodes exhibited excellent electrochemical properties, including a high specific capacity (1800 mAh/g), a stable cycling retention (cycling retention of 89% after 20 cycles), and a high rate capability (71% at 3 C rate, compared to 0.1 C rate). This process is a simple and mass-productive (yield of 40-50%), thus opens up an effective route to make a high-performance silicon anode materials for lithiumion batteries.

• 한국해양환경ㆍ에너지학회지
• /
• 제5권1호
• /
• pp.19-29
• /
• 2002

본 논문에서는 운송시간과 운송비용으로 구성되는 희생량 모델과 각 운송경로별 CO₂배출량을 고려한 수출입 컨테이너화물의 운송경로 선택에 관하여 고찰한다. 먼저 부산항을 이용하는 수출입 컨테이너화물의 물동량과 운송경로별 분담, 국내외 CO₂배출량 현황, 희생량 모델, 수출입 컨테이너화물의 시간가치에 대하여 간단히 살펴본다. 그리고 서울에서 발생한 수출입 컨테이너화물을 부산항으로 운송하는 경우를 가정하고 희생량 모델을 이용하여 계산한 각 운송경로별 희생량에 기초한 운송경로의 선택에 대하여 고찰한다. 또한 화물의 운송에 의하여 발생하는 CO₂배출량을 고려하여 결정한 환경부하 희생량을 추가한 희생량 모델을 이용한 운송경로의 선택에 대해서도 고찰한다. 본 연구의 결과, 희생량 모델에 기초한 컨테이너화물의 운송경로 선택이 수출입 컨테이너화물의 국내 수송 현황을 잘 나타내고 있는 것을 확인하였다. 또한 연안운송의 운송분담율을 높이기 위해서는 운송시간의 단축이 가장 효과적인 것을 확인하였다.

• 공업화학
• /
• 제21권6호
• /
• pp.694-696
• /
• 2010

용액공정을 이용하여 표면에 알킬기를 도입하고, 붕소(boron) 또는 인(phosphorous)으로 도핑된 실리콘 나노 입자를 합성하였다. 나노 입자의 합성 여부 및 입자크기는 핵자기공명분광기(NMR), 적외선분광기(FT-IR), 자외선가시광선분광기(UV-Vis), 인광분광기(PL)를 이용하여 분석하였다. 마이크로웨이브 소결기를 이용하여 표면의 알킬기를 제거하고, 결정성을 갖는 필름을 제작하였다. 필름의 조각은 $200{\mu}m$ 정도의 크기를 가지며 큐빅구조를 가지고 있다는 것을 전자주사현미경(FE-SEM)과 투과전자현미경(FR-TEM)으로 확인할 수 있었다. 필름의 전도도는 도핑 타입을 통해 조절할 수 있었다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 춘계학술대회 논문집
• /
• pp.496-504
• /
• 2011

The region trunk line railroad route undergoes an influence on a large scale in train operation systematic reorganization. This keynote of the train operation not being to the consumer and not to be is because being to the supplier. The trunk line route user of region supply change of the supplier sensitively, accepts but, the demand unit will be able to change the supply massive demanders does not become and like that to accept this back is not the railroad the mean of transportation which grudge is different a mean of transportation mainly makes use. This hits to neither the gist of GLORY promotions of the railroad public corporation which pursues the railroad use which is ordinary even in the basis of governmental policy of stock of coal small green growth and not to be is arranged. For the railroad use activation of the region trunk line route consequently and to excavate the demand hindrance element and a demand lure element the inside and the outside defines and to observe the fluctuation of use importing in existing train operation systematic fluctuation, with the user tries analyzes the instance of the overseas railroad enterprise about the process which reflects the opinion of the area and improvement under preparing boil.

• Bulletin of the Korean Chemical Society
• /
• 제35권7호
• /
• pp.2148-2150
• /
• 2014

• 한국수소및신에너지학회논문집
• /
• 제27권5호
• /
• pp.562-570
• /
• 2016

At the carbon dioxide capture process using the aqueous amine solution, degradation of absorbents is main factor to reducing the process performance. Also, degradation mechanism of absorbent is important for understanding the environmental risk, route of degradation products, health risk etc. In this study, the degradation products of MEA were studied to clarify mechanism in thermal degradation process. The degradation products were analyzed using a $^1H$ NMR (nuclear magnetic resonance) and $^{13}C$ NMR. The analysis methods used in this study provide guidelines that could be used to develop a degradation inhibitor of absorbent and a corrosion inhibitor.