• 보존과학연구
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• 통권32호
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• pp.89-98
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• 2011

철 부식화합물은 부식인자들과 함께 다양한 결정구조를 가지며 2가지 이상의 부식화합물들이 혼합되어 존재하므로 각각의 특성을 밝혀내기가 매우 어렵다. 본 연구는 표준 철 부식물을 대상으로 Raman Micro-Spectroscopy 분석을 실시하여 표준 Raman Data 확보를 목적으로 수행하였다. 표준 철 부식물에 대한 신뢰성을 향상시키기 위하여 SEM-EDS 분석과 XRD 분석을 추가로 실시하였다. SEM-EDS 분석결과 모두 표준 철 부식물의 구성성분과 일치하였으나 Goethite의 경우 철 이외의 비철금속 성분이 검출되었다. XRD 분석 결과 모두 표준 철 부식물의 구조와 일치 하였으나 Iron sulfate($FeSO_4{\cdot}6H_2O$)의 경우 Rozenite($FeSO_4{\cdot}4H_2O$)로 확인되었다. Raman Micro-Spectroscopy 분석결과 기존에 연구되었던 수산화철, 산화철의 Wavenumber에서 새로운 peak이 발견되었는데 이는 레이저 파장의 변화에 따른 것으로 사료 된다. 염화철과 황산철에서 Wavenumber가 새롭게 확인되어 표준 Raman Data 8건을 확보하였다. Raman Micro-Spectroscopy는 적은양의 시료를 이용하여 물질의 특성과 구조를 비교적 간단하게 분석 할 수 있어 미세한 부분이나 시료의 양이 한정된 문화재에 활용도가 높을 것으로 판단된다.

• 한국토양환경학회지
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• 제4권3호
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• pp.85-93
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• 1999

유기 염소계 화합물과 니트로기 방향족 화합물 같은 난분해성 유해물질을 처리함에 있어, 0가 철 분말의 사용은 최근에 가장 활발히 논의되고 있는 기술 가운데 하나이다. 본 연구에서는 나노크기의 0가 철 분말을 실험실에서 만들어 유기 염소계 화합물의 탈염소화 반응과 니트로기 방향족 화합물의 니트로기 변환실험을 혐기성 회분식 반응조에서 실시하였다. 매우 큰 비표면적과 높은 반응성을 가지고 있는 나노크기 0가 철 입자는 10mg/$\ell$로 농도수용액상에 존재하는 TCE, 클로로포름, 니트로 벤젠, 니트로 톨루엔, 디니트로 밴젠, 디니트로 톨루엔등의 물질을 상온.상압의 조건에서 빨리 제거할 수 있었다. 본 연구에서는 반응 시간 30분 안에 TCE는 에탄으로, 클로로포름은 메탄으로 탈염소화 되었고, 니트로기 방향족 화합물의 니트로기는 모두 아민기로 변환되었다. 이러한 결과들은 유기 염소계 화합물과 니트로기 방향족 화합물 같은 난분해성 유해물질로 오염된 지하수나토양을 복원함에 있어, 나노크기의 0가 철 분말을 이용한 화학적 처리기술의 잠재성을 나타내주는 것이다.

• 한국세라믹학회지
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• 제11권2호
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• pp.22-30
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• 1974

This study was carried out to investigate the species of iron compounds in kaolin mineral and the bonding relation between the major kaolin and its subordinate iron compound existing as incidental mineral in common clay by means of chemical composition, X-ray diffraction, thermal differential and thermogravimetrie analysis for the application of clays in the field of ceramic raw material. The domestic clay are produced abounduntly in many places, but San-Cheong kaolin, Chu-An clay, and Yeong-Am clay were selected as samples in this experiment because of their frequent utilization in porcelain industry. Two kinds of samples with low and high iron content are picked up respectively from the place of production and elutriated under two micron size to determine the properties and concentration of iron compound very fine particles or colloidal substance of low crystalline grade. Therefore, hydrothermal treatment in autoclave was conducted considering the existence of low crystalline grade of iron compounds known as an amorphoue state in X-ray diffraction pattern furthermore, de-iron treatment of hydrothermal compound was done in order to identify the related iron compound before and after hydrothermal reaction and iron compound which is one of the samples was synthesized for the determination of their compounds state in more detail. The obtained results in this study are as follows: In San-Cheong kaolin, Chu-An clay and Yeong-Am clay 1) It is proved that species accompanying iron compound is $\alpha$-FeOOH form. 2) Iron compound is composed of very fine particles or colloidal substance. 3) The iron substance encircles the fine parts of clay minerals under 2 micron and acts as cementizing agent.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 총회 및 춘계학술발표회
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• pp.58-61
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• 2002

An alternative to pump and treat groundwater remediation is the use of reactive barriers. Zero valent iron (ZVI) is particularly useful as a reductant of chlorinated hydrocarbons because of its low cost and lack of toxicity ZVI can drive the dechlorination of chlorinated organic compounds and the reduction of chromium from the Cr(Ⅵ) to the Cr(III) state. The contaminants in subsurface environment usually exist as the mixed compounds. Therefore, the objective of this research is to study the effect of the other compounds on TCE removal by ZVI. The removal mechanism of TCE by ZVI is separated the dechlorination and sorption. TCE removal by ZVI slightly increased in presence of naphthalene as the non-reduced compound. TCE removal by ZVI remarkable decreased in presence of carbon tetrachloride, nitrate, and chromate as the reduced compounds. This research suggests that the effect of the coexisted compounds on the removal chlorinated compounds by reactive barrier technology should be considered for practical application.

• BMB Reports
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• 제43권10호
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• pp.683-687
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• 2010

Previous studies have shown that one of the primary causes of increased iron content in the brain may be the release of excess iron from intracellular iron storage molecules such as ferritin. Free iron generates ROS that cause oxidative cell damage. Carnosine and related compounds such as endogenous histidine dipetides have antioxidant activities. We have investigated the protective effects of carnosine and homocarnosine against oxidative damage of DNA induced by reaction of ferritin with $H_2O_2$. The results show that carnosine and homocarnosine prevented ferritin/$H_2O_2$-mediated DNA strand breakage. These compounds effectively inhibited ferritin/$H_2O_2$-mediated hydroxyl radical generation and decreased the mutagenicity of DNA induced by the ferritin/$H_2O_2$ reaction. Our results suggest that carnosine and related compounds might have antioxidant effects on DNA under pathophysiological conditions leading to degenerative damage such as neurodegenerative disorders.

• Bulletin of the Korean Chemical Society
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• 제15권6호
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• pp.424-427
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• 1994

Effects of iron compounds in known biomimetic oxidation systems (Gif IV and GoAgg II) have been studied on activity and ketone/alcohol selectivity of cyclohexane oxidation. Both ketone/alcohol ratio and cyclohexane conversion were affected by counter-ion Z of iron compounds Z-Fe. When Z has a more electron withdrawing property, the reactivity is increased and the formation of ketone is favored. From these experimental results, a new mechanism is proposed for the biomimetic oxidation system.

• 한국재료학회지
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• 제33권9호
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• pp.353-359
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• 2023

This study investigated the growth behavior and characteristics of compounds formed at the interface between a liquid Al-Si-Cu alloy and solid cast iron. Through microstructural analyses, it was observed that various AlFe and AlFeSi phases are formed at the interface, and the relative proportion of each phase changes when small amounts of strontium are added to the Al alloy. The results of the microstructural analysis indicate that the primary phases of the interfacial compounds in the Al-Si-Cu base alloy are Al₈Fe₂Si and Al_4.5FeSi. However, in the Sr-added alloys, significant amounts of binary AlFe intermetallic compounds such as Al₅Fe₂ and Al₁₃Fe₄ formed, in addition to the AlFeSi phases. The inclusion of Sr has a slight diminishing effect on the rate at which the interfacial compounds layer thickens during the time the liquid Al alloy is in contact with the cast iron. The study also discusses the nano-indentation hardness and micro-hardness of the interfacial phases.

• 한국표면공학회지
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• 제9권2호
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• pp.1-7
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• 1976

The dissolving and growth kinetics of intermetallic compounds for the reaction between solid iron and molten zinc were studied under nitorgen atmosphere over the temperature range between470$^{\circ}C$ and 680$^{\circ}C$. The rates of dissolution of solid iron into molten zinc were obtained under a static conditon, The amount of dissolution of sold iron and the growth of intermetalic compounds could be determined by means of microscopy. The thickness of intermetallic compound at a given temperature increases with increasing time, whereas for a given time decreases with increasing temperature . The rate of dissolution is controlled by the diffusion process of iron in the effective boundary layer of molten zinc over the temperature range 470$^{\circ}$-530$^{\circ}C$, 570$^{\circ}$-620$^{\circ}C$, and 650$^{\circ}$-665$^{\circ}C$, while by the surface reaction over the range 530$^{\circ}$-570$^{\circ}C$ and 620$^{\circ}$-650$^{\circ}C$.

• Nuclear Engineering and Technology
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• 제44권8호
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• pp.945-952
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• 2012

The sorption of selenium ions onto iron and iron compounds as a disposal container material and its corrosion products, and onto bentonite as a buffer material, was studied to understand the behaviors of selenium in a waste repository. Selenite was sorbed onto commercial magnetite very well in solutions at around pH 9, but silicate hindered their sorption onto both magnetite and ferrite. Unlike commercial magnetite and ferrite, flesh synthesized magnetite, green rust and iron greatly decreased selenium concentration even in a silicate solution. These results might be due to the formation of precipitates, or the sorption of selenide or selenite onto an iron surface at below Eh= -0.2 V. Red-colored Se(cr) was observed on the surface of a reaction bottle containing iron powder added into a selenite solution. Silicate influences on the sorption onto magnetite and iron for selenide are the same as those for selenite. Even though bentonite adsorbed a slight amount of selenite, the sorption cannot be ignored in the waste repository since a very large quantity of bentonite is used.

• 대한핵의학회지
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• 제1권2호
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• pp.41-59
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• 1967

This study was aimed; firstly to observe various clinical symptomatology with reiation to the number of Ancylostoma duodenale larvae orally given to the human beings, secondly to evaluate the effects of some drugs like steroid hormones, antihistaminic3 and antitussives, and, thirdly to study the influences of some iron compounds in prevention and treatment of anemia of such origin. Ten healthy volunteers free from the previous history of hookworm infection were divided into 4 groups, to whom various numbers of actively moving filariform Ancylostoma duodenale larvae were orally given; 500 to 4 cases, 250 to 3 cases and 100 to 3 cases. Following were the results: 1. Clinical symptomatology 1. The most frequently encountered symptoms and signs were general malaise, cough and hoar seness. The tracheal itching and pain low back pain, arthralgia, sputum and salivation, acid belching, loss of appetite, abdominal pain and vomiting were also noted. 2. If the larger number of the larvae was given, the clinical symtomatology was more severe. 3. Prednisolone medication caused some improvement of such symptomatology, while the antihistaminics and antitussives like codeine or ephedrine were ineffective. 4. In volunteers whose nutritional conditions were rather poor appeared to show more severe symptomatology. 2. Effects of iron compounds 1. The oral administration of ferrous fumarate induced a slight increase of serum iron levels in the initial stage of the infection, then a decrease from $15{\sim}20$ days later and a recovery after 2 months. 2. The intravenous administration of saccharated ferric oxide induced a steady upkeep of the serum iron levels. 3. The hemoglobin contents also showed the upkeeps after either the oral or intravenous administration of the iron compounds. 4. The iron compounds, therefore, are considered to have the preventive as well as the therapeutic effects on hookworm anemia, which may strongly suggest that hookworm anemia is essentially the iron deficiency type. 3. Hematological changes 1. The severity of hookworm anemia generally correlated with the number of larvae given. 2. The moderate leucocytosis was observed in all cases regardless of the number of larvae given, which reached to a peak in $25{\sim}35$ days. 3. Eosinophilia was observed in all cases, but was more severe in cases given larger number of larvae, which was slightly less evident after the medication of prednisolone. 4. Red cell survival time The red cell survival time determined by $^{51}Cr$ was generally in the normal ranges except for the severe anemia patients.