Abstract
Nuclear spin relaxation is a particularly useful tool for investigating molecular motion in liquid crystals because there are many motional processes with correlation times in the vicinity of nuclear Larmor frequencies. A partial list of such processes includes molecular reorientation, quasicoherent director fluctuations (1), fluctuations of local order (2), translation-rotation coupling (3, 4), and chemical exchange between “sites” of different degrees of local order (5). It is generally far from trivial to decide what combination of processes is the dominant source of spin relaxation, and measurements over as wide a range of Larmor frequencies as possible are needed. In addition, different motional processes may have characteristically different temperature dependence, although it must be noted that quantitative analysis of the temperature dependence is often hindered by lack of sufficient information about hydrodynamic parameters which appear in director fluctuation theories.
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Vold, R.L., Vold, R.R., Martin, J.F., Nishida, B.C., Selwyn, L.S. (1986). Deuterium Spin Relaxation and Molecular Motion in Liquid Crystals. In: Niccolai, N., Valensin, G. (eds) Advanced Magnetic Resonance Techniques in Systems of High Molecular Complexity. Progress in Inorganic Biochemistry and Biophysics, vol 2. Birkhäuser Boston. https://doi.org/10.1007/978-1-4615-8521-3_19
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