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. 2017 Jan 27;114(7):E1046–E1053. doi: 10.1073/pnas.1620427114

Table 3.

Mean nanophase composition and corresponding proton balanced composition, mean Mn AOS for the sample suite, and surface enthalpy

Phases Average composition Average composition with proton balance Mean Mn AOS SE(hyd), J/m2*
CR2 K0.11·MnO1.94·0.37H2O K0.11H0.12MnO2·0.37H2O 3.78 ± 0.01 0.77 ± 0.10
NaBi Na0.09·MnO1.82·0.52H2O Na0.09·H0.36MnO2·0.52H2O 3.56 ± 0.01 0.69 ± 0.13
KBi K0.21·MnO1.87·0.33H2O K0.21H0.27MnO2·0.33H2O 3.52 ± 0.01 0.55 ± 0.11
CaBi Ca0.12·MnO1.81·0.72H2O Ca0.12H0.38MnO2·0.72H2O 3.50 ± 0.01 0.41 ± 0.11
CaMnO Ca0.39MnO2.34·0.42H2O Ca0.05MnO2·0.42H2O 3.89 ± 0.01 0.75 ± 0.11
CaMnO Ca0.43MnO2.27·0.31H2O Ca0.16MnO2·0.31H2O 3.68 ± 0.01 0.57 ± 0.12

Cryptomelane: CR2, NaBi, KBi, and CaBi (Bi, birnessite) are from the present work.

*

Surface enthalpies are for the hydrous surfaces [SE(hyd)].

Samples of Ca–Mn–oxide nanosheets (6).