鉱物粉塵の熱分析による基礎的研究 (第1編) : 石英の粒度とα-β転移温度との関係

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Very fine grains floating in the air are recognized on the human respiratory tract deposits, but past studies have only considered the size of inhaled grains with aerodynamic properties as the focus of concern. However, fine grain reactivity and changeable surface should be understood if there is to be clarification of the effects to the respiratory tract. In this paper, three kinds of finely grond quartz were classified by thermal analysis, and the relationships between α-β transformation temperatures, energies and grain sizes were observed using DTA curves.Pure α-form quartz was ground into three powder types containing grains 1.5μm, 1.0μm and 0.5μm in mode diameter. The relationship between grinding time and mode diameter is given as the following equation:d=3.7925-0.7213lntwhere d denotes mode diameter (μm) and t grinding time (in hours). α-β transformation temperature and energy were found to depend on grain size. Transformation temperature and energy required increase when finer grains are used. Transformation energy was 1.92cal/g at 572.5°C with 1.5μm, 2.2cal/g at 577°C with 1.0μm, and 2.47cal/g at 578°C with 0.5μm quartz powders respectively. The following equation shows the relationship between α-β transformation energy and grain size.Q=2.4764-0.5500dwhere Q denotes transformation energy (cal/g) and d mode diameter (μm). These finding suggest that the finer quartz has higher surface activity and reactivity, which may, in turn, cause more serious effects biologically within the deeper regions of the respiratory tract.
日本衛生学会の論文

鉱物粉塵の熱分析による基礎的研究 (第1編) : 石英の粒度とα-β転移温度との関係

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