2010
DOI: 10.1039/c0sm00085j
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Lamellar phase separation in a centrifugal field. A method for measuring interbilayer forces

Abstract: We present a novel method for measuring interbilayer forces in lamellar liquid crystals of amphiphilewater systems. In a centrifuge the gravitational effect is easily strong enough to produce clearly observable concentration gradients. During the experiment the concentration profile in the test-tube is monitored using NMR imaging of the deuterium quadrupole splitting in the lamellar phase, by temporarily transferring the sample into a NMR spectrometer. We also present a theoretical analysis of the experiment, … Show more

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Cited by 15 publications
(20 citation statements)
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“…Comparing the results of Eq. (12) with the existing experimental data [26], we find that the present results are in good agreement with the experimental results (Fig. 2).…”
Section: Model Of Undulation Forcesupporting
confidence: 92%
See 1 more Smart Citation
“…Comparing the results of Eq. (12) with the existing experimental data [26], we find that the present results are in good agreement with the experimental results (Fig. 2).…”
Section: Model Of Undulation Forcesupporting
confidence: 92%
“…He asserted that the undulation force essentially varies with c −3 , where c is the separation between neighboring membranes [20]. Although some assumptions and simplifications were introduced in Helfrich's investigations [20,21], his results were still supported by succeeding studies, including theoretical [1,[22][23][24][25] and experimental work [11,26], as well as computational simulations [27,28]. Recently, Freund [29] reexamined the entropic force under conditions in which some of Helfrich's assumptions [20] were abandoned.…”
Section: Introductionmentioning
confidence: 99%
“…e . 16 , and with ( iii ) a low enough value of the membrane lateral tension.
Figure 2Typical evolution of a C 10 E 3 solution that has experienced shearing during sample preparation. Images are taken from Supplementary Movie M2, during quenching at 30 °C.
…”
Section: Resultsmentioning
confidence: 99%
“…In the W + L α two phase region, the lamellar phase can often be fragmented into unilamellar vesicles 15 . The bending rigidity of the C 10 E 3 bilayer was determined to be 5 k B T at room temperature 16 . Vesicles, lamellar phase and sponge phase represent different topologies of the bilayer.…”
Section: Introductionmentioning
confidence: 99%
“…24,27,49,50 Despite the fact that these NMR and MRI methods have been extensively used for investigating macroscopic domain alignment in liquid crystals, 8,9,14,15,18,19,21,23,24,26,27,40,44,[49][50][51][52][53][54][55] there are so far no reported studies where the full order tensor has been mapped with spatial resolution. In principle, such tensor maps could be obtained by acquiring spatially resolved 2 H spectra 24,27,[55][56][57] for multiple orientations of the main magnetic field. 58 Unfortunately, such an experimental approach would require combinations of NMR hardware that are exceedingly rare.…”
Section: Introductionmentioning
confidence: 99%