Response Surface Methodology Study on Magnetite Nanoparticle Formation under Hydrothermal Conditions

In a hydrothermal preparation of crystalline magnetite (Fe3O4) nanoparticles, the influence of the experimental parameters (initial molar ratio of ferrous/ferric ions, initial concentration of ferrous ions, and heating time), and their interactions, on the particle formation was studied using response surface methodology (RSM), based on a statistical design of experiments (DOE). As indices indicating particle formation and crystallization, the variation in the particle diameter and crystallite size with the synthesis conditions was examined. The crystallite size was greatly affected by both the initial ferrous/ferric ion molar ratio and the heating time, whereas the particle diameter strongly depended on the heating time, and on the interaction between the initial ferrous/ferric ion molar ratio and the initial concentration of ferrous ions. The results from a statistical analysis suggest that the polycrystalline Fe3O4 nanoparticles form via crystal growth and/or thermal aggregation, after nucleation during hydrothermal treatment

Reaction of layered carbon fluorides CₓF (x=2.5–3.6) and hydrogen

The layered carbon fluorides CₓF (x = 2.5, 2.8, 3.6), generally classified as fluorine–graphite intercalation compounds, were heat-treated in hydrogen gas. These fluorides are more reactive with hydrogen compared to (CF)ₙ and (C₂F)ₙ. Reduction of CₓF to graphite-like carbon starts at about 573 K, and proceeds gradually along with the elevation of temperature. Fluorine atoms in CₓF are eliminated as HF in the reduction process without being substituted by hydrogen atoms. Systematic difference was not found in the average crystallite sizes of the carbon material prepared from CₓF by the reduction with hydrogen and that by the pyrolysis in vacuum. On the other hand, interlayer distance and fluorine content of the former are smaller than those of the latter. In the case that the CₓF precursor maintains a large particle size, the reduced carbon as well as the pyrolytically prepared carbon possesses a foam-like shape due to the exfoliation during the heat treatment

FILM COATING ONTO COHESIVE FINE PARTICLES BY A NOVEL ROTATING FLUIDIZED BED COATER

In this study, film coating onto cohesive fine particles was conducted by using a novel rotating fluidized bed coater (RFBC). In order to avoid the formation of agglomeration, baffle plates were equipped inside the RFBC. Coating experiments were conducted under various operating conditions and the coated particles were evaluated based on their physical properties. As a result, coated particles having extremely small degree of agglomeration and favorable prolonged release property of a tracer material could be obtained

高自殖性シダ植物種における集団の遺伝的構造の特異性の解析

金沢大学理学部研究課題/領域番号:02740346, 研究期間(年度):1990出典：研究課題「高自殖性シダ植物種における集団の遺伝的構造の特異性の解析」課題番号02740346（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-02740346/）を加工して作

同形胞子シダ植物における同倍数性レベルでの網目状進化

金沢大学理学部研究課題/領域番号:04740387, 研究期間(年度):1992出典：研究課題「同形胞子シダ植物における同倍数性レベルでの網目状進化」課題番号04740387（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-04740387/）を加工して作

オオハナワラビ属における網目状進化の葉緑体DNA多型による解析

金沢大学理学部研究課題/領域番号:03740358, 研究期間(年度):1991出典：研究課題「オオハナワラビ属における網目状進化の葉緑体DNA多型による解析」課題番号03740358（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-03740358/）を加工して作