『Abstract
High-resolution in situ X-ray specular reflectivity was used
to measure the structures of orthoclase (001) and (010) cleavage
surfaces in contact with deionized water at 25℃. X-ray reflectivity
data demonstrate a high degree of structural similarity between
these two orthoclase-water interfaces. Both interfacial structures
include cleavage along the plane of mineral bond breakage resulting
in surfaces terminated by non-bridging oxygens; structured water
within 5Åof the orthoclase surface (consisting of adsorbed species
at the surface and layered water above the surface), with a featureless
water profile beyond 5Å; substitution of outermost K+
ions by an oxygen containing species (presumably H3O+);
and small structural displacements of the near surface atoms.
The interfacial water structure, in comparison with recent results
for other mineral-water interfaces, is intermediate between the
minimal structure found at calcite-, barite-, and quartz-water
interfaces and the more extensive structure found at the muscovite-water
interface.』
『高分解能現位置X線正反射法が、25℃において脱イオン水と接する正長石の(001)と(010)劈開面の構造を測定するために使われた。X線反射法のデータは、これら2つの正長石−水界面間で構造的類似性が非常に高いことを示す。両方の界面構造は、終端が非橋かけ酸素で終わる鉱物結合破断面に沿った劈開;5Åを超えた特徴のない水断面をもつ、(表面に吸着した化学種と、表面上の層状水からなる)正長石表面の5Å以内にある構造化した水;酸素を含む化学種(おそらくH3O+)による最外部のK+イオンの置換;および表面近くの原子の小さな構造転位、を含んでいる。他の鉱物−水界面についての最近の結果に比べて、この界面水構造は、方解石−水、重晶石−水、石英−水の界面で見られる微小な構造と、白雲母−水界面で見られるもっと広範囲の構造の中間的なものである。』
1. Introduction
2. Experimental details
3. Orthoclase (001)- and (010)-water interface structures
3.1. Comparison of reflectivity data and best-fit models
3.2. Detailed description of structural models
3.3. Description of the best-fit models
3.3.1. Orthoclase (001)
3.3.2. Orthoclase (010)
4. Summary and conclusion
Acknowledgments
References