Specific surface area, density and microstructure of frost flowers
Specific surface area, density and microstructure of frost flowers
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霜花的比表面积、密度及微观结构
DOI：
10.1029/2005gl023245
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发表时间：
2005
影响因子：
5.2
通讯作者：
K. Severin
中科院分区：
文献类型：
--
作者：
F. Dominé;A. Taillandier;W. Simpson;K. Severin
霜花通常生长在新的海冰上。它们被认为具有高比表面积(SSA)，为多相反应提供了场所。我们在77K下用甲烷吸附法测量了霜花的表面积，得到了185cm2/g(+80−50)cm~2/g，远低于其他人的推测。其密度为0.02g/cm~3。我们计算出霜花的总表面积为1.4m2/m2冰面，因此它们不会显著增加冰面面积。应该重新考虑它们作为强化多相反应场所的作用。霜花通常也生长在淡水中，幼小的海冰上的盐水对它们的生长并不是必需的。照片和电子显微镜显示了中空和凹陷的结构，这是生长非常快的晶体的典型特征。凝结霜花的盐水极大地干扰了它们的生长。
Frost flowers often grow on new sea ice. They are thought to have a high specific surface area (SSA) that provides sites for heterogeneous reactions. We have measured the SSA of frost flowers using CH4 adsorption at 77 K and obtained a value of 185 (+80 −50) cm2/g, much lower than inferred by others. Their density is 0.02 g/cm3. We calculate that the total surface area of frost flowers is 1.4 m2 per m2 of ice surface, so that they do not increase the ice surface area significantly. Their role as sites for enhanced heterogeneous reactions should be reconsidered. Frost flowers also commonly grow on fresh water and the saline brine seen on young sea ice is not necessary for their growth. Photo‐ and electro‐micrographs reveal hollow and concave structures, typical of very fast growing crystals. The brine that wicks up frost flowers considerably perturbs their growth.