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In contrast to the work of Whetten and Schaaf 27 and Kimura et al., 30 Au1-Au4 are not monodisperse. Therefore, the CD measured represents the average over all particle sizes in the sample. The weak CD, attributed to artifacts, measured for Au1 and Au2, however, are reproducibly positive for different preparations (prepared on different days with the same set of starting materials). For example, the CD spectra of Au1 and the CD spectra of the concentration dependence were measured for different preparations of Au1 (see Fig. S2 and S3 in ESI). We are currently trying to determine the nature of these artifacts, and the contributions from multiple scattering of particle aggregates in solutions. Time-dependent dynamic light scattering (DLS) measurements show that all particles, Au1-Au4, aggregate in solution as indicated by a significant increase in the size of the particle aggregates over the time frame of the CD measurements
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These interactions would also facilitate aggregation of particles in solution. Contributions from circular differential scattering due to the formation of cluster aggregates were not discussed in previous experimental reports 27,29,30 on chiral gold nanoparticles For an example, see:
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C. Bustamante I. Tinoco, Jr. M. F. Maestre Proc. Natl. Acad. Sci. U. S. A. 1983 80 3568
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Tinoco Jr., I.2
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27144549231
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Further electro-optical investigations will be reported in due course Alkylthiols used in self-assembled monolayers (SAMs) are known to promote homeotropic anchoring of N-LCs such as 5CB (here LC2):
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The sharp boundaries between birefringent and homeotropic areas appear similar to textures shown for patterned surfaces reported by Clark and Lee - a result of chiral symmetry breaking at the interface between parallel and homeotropically aligned domains in the absence of a chiral phase. See:
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Li, F.2
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Cheon, C.I.5
Glushchenko, A.6
Reshetnyak, V.Y.7
Sluckin, T.J.8
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