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|Section2= |Section3= }} Bromocyclohexane (also called Cyclohexyl bromide, abbreviated CXB) is an organic compound with the chemical formula C6H11Br. It is used to match the refractive index of PMMA for example in confocal microscopy of colloids. A mixture of cis-decalin and CXB can simultaneously match optical index and density of PMMA.〔Wiederseiner, S., Andreini, N., Epely-Chauvin, G. & Ancey, C. Refractive-index and density matching in concentrated particle suspensions: a review. Experiments in Fluids 50, 1183–1206 (2010).doi:(10.1007/s00348-010-0996-8 )〕 Due to the moderate dielectric constant of CXB (ε = 7.9 〔http://www.deltacnt.com/99-00032.htm〕), PMMA acquires charges that can be screened by the addition of salt (e.g. tetrabutyl ammonium bromide), leading to a very good approximation of colloidal hard sphere.〔Royall, C. P., Poon, W. C. K. & Weeks, E. R. In search of colloidal hard spheres. Soft Matter (2012). doi:(10.1039/c2sm26245b )〕 A drawback is that CXB is a good solvent for PMMA, causing it to swell over time, which may lead to a poor determination of particle radii and determination of solid volume fraction.〔Poon, W. C. K., Weeks, E. R. & Royall, C. P. On measuring colloidal volume fractions. Soft Matter 8, 21 (2012). doi:(10.1039/c1sm06083j )〕 == Synthesis == Bromocyclohexane can be prepared by the free radical substitution of bromine to the cyclohexane ring at high temperatures or in presence of electromagnetic radiation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bromocyclohexane」の詳細全文を読む スポンサード リンク
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