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Seiichiro Nagayama Katsumi Katoh Eiko Higashi Katsuyuki Nakano Kosuke Kumagae Hiroto Habu Yuji Wada Mitsuru Arai 《Journal of Thermal Analysis and Calorimetry》2014,118(2):1215-1219
Ammonium nitrate (AN) is an affordable oxidant; however, it undergoes crystal structure transformations accompanied by a change in volume at comparatively low temperatures (approx. 30, 80, and 125 °C) and exhibits high hygroscopicity. Both these properties are particularly problematic for the industrial application of AN. In a previous study, we prepared spray-dried particles comprising three components: AN, potassium nitrate (PN) as a phase stabilizer, and a polymer (e.g., polyvinyl alcohol, carboxymethylcellulose salt, and styrene-butadiene latex), which was confirmed to provide effective moisture proofing. In the present study, the crystal transformation behavior of AN/PN/Polymer particles is investigated by observing their thermal behavior by differential scanning calorimetry. The results reveal that phase-stabilized AN can be successfully prepared by the addition of PN. In addition, an intriguing possibility was identified in that carboxymethylcellulose ammonium salt and polyvinyl alcohol, which were both added as polymer components for moisture proofing, also acted as phase stabilizers for AN crystal transformation. 相似文献
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Computer simulations of the shear flow for the suspensions of oblong-particles were performed using nonequilibrium Brownian
Dynamics (BD). The model particle is a rigid body made up of linearly connected spheres with the interparticle potential of
a repulsive Lennard-Jones potential. The length-over-width ratios of the oblong-particles used in the present calculations
are 5/3 and 3. In the concentrated suspensions high orientation is easily induced by shear at low shear rates. The systems
of the oblong-particles exhibit the structural transition that causes the significant change in the rheological properties
at high shear rates. Furthermore, the dependence of the length-over-width ratio of the particle is examined.
Received: 16 June 1997 Accepted: 3 February 1998 相似文献
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