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- W2008779962 abstract "Combined studies by atomic force microscopy, x-ray reflectivity, and Fourier transform infrared spectroscopy on transition-metal stearate ($M$-St, $M$ $=$ Mn, Co, Zn, and Cd) Langmuir-Blodgett films clearly indicate association of bidentate coordination of the metal-carboxylate head group to layer-by-layer growth as observed in MnSt and CoSt and partially in ZnSt. Crossover to islandlike growth, as observed in CdSt and ZnSt, is associated with the presence of unidentate coordination in the head group. Morphological evolutions as obtained from one, three, and nine monolayers (MLs) of $M$-St films are consistent with Frank van der Merwe, Stranski-Krastanov, and Volmer Weber growth modes for $M=mathrm{Mn}$/Co, Zn, and Cd, respectively, as previously assigned, and are found to vary with number ($n$) of metal atoms per head group, viz. $n=1$ (Mn/Co), $n=0.75$ (Zn), and $n=0.5$ (Cd). The parameter $n$ is found to decide head-group coordination such that $n=1.0$ corresponds to bidentate and $n=0.5$ corresponds to unidentate coordination; the intermediate value in Zn corresponds to a mixture of both. The dependence of the growth mode on head-group structure is explained by the fact that in bidentate head groups, with the in-plane dipole moment being zero, intermolecular forces between adjacent molecules are absent and hence growth proceeds via layering. On the other hand, in unidentate head groups, the existence of a nonzero in-plane dipole moment results in the development of weak in-plane intermolecular forces between adjacent molecules causing in-plane clustering leading to islandlike growth." @default.
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- W2008779962 date "2011-04-07" @default.
- W2008779962 modified "2023-09-27" @default.
- W2008779962 title "Crossover from layering to island formation in Langmuir-Blodgett growth: Role of long-range intermolecular forces" @default.
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- W2008779962 doi "https://doi.org/10.1103/physreve.83.041604" @default.
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