Polarity formation

Figure 7.2 Activation and interaction of a heteronuclear pair of atoms. Red dots indicate the activation levels of homonuclear diatomics. Because of the difference in polarity formation of the heteronuclear molecule is favoured.

B.B. Gupta, P. Blanpain and M.Y. Jaffrin, Permeate flux enhancement by pressure and flow pulsations in microfiltration with mineral membranes. /. Membr. Sci., 70 (1992) 257. M.Y. Jaffrin, L.H. Ding and J.M. Laurent, Kinetics of concentration polarization formation in crossflow filtration of plasma from blood experimental results. /. Membr. Sci., 72 (1992) 267. 

Hulliger, J., Polarity formation Markov chain model , in Encyclopedia of Supramolecular Chemistry, Atwood,... 

Fig. 1 Polarity formation for channel-type inclusion compounds. where A-D molecules enter channels, while the crystal grows in the direction of the channels. Orientational selectivity for A-D molecules is assumed to occur independently for each channel (A-and D-sites). (View this art in color at www.dekker.com.)...

From the point of view of optimizing the extent of polarity formation,we may ask for the best type of A-D molecules in order to obtain X close to 1 at lowest possible q. The Markov model gives the answer. Guest molecules providing an A R structure (R fragment... 

Fig. 5 Second-hannonic generation analysis to show polarity formation in the centrosymmetiiccrystal structure of 4 chloro-4 -nitroslilbene. Micrometer thin crystal plate with (001) orientation, grown from the melt, (a) Polarization of the fundamental wave (1064 nm) parallel to the /)-axis. Both the upper and lower h-sectors emit green light. (b) Effect of phase contrast for the lower b-sector. (c) Correspondingly, upper l)-scctor. The change in contrast within sectors allows us to conclude that the average polarization in the lower (b) sector is opposite that in the upper (c) one. (View this art in color at www.dekker.com.)...

In centrosymmetric structures, there are at least two different growth sites (similar to those shown in Fig. 1) for which we may assume independent Markov chains, such as to describe polarity formation by taking into ac-coimt longitudinal ( A >) and transversal (E parallel... 

Bebie. H. Hulliger. J. Eugster, S. Alaga-Bogdanovic. M. Ising model of polarity formation in molecular crystals From the growth model to the asymptotic equilibrium state. Phys. Rev., E 2002, 66, 021605. 

Quintel, A. Hulliger. J. A theoretical base for optimising intermolecular interactions driving polarity formation in channel-type host-guest materials. Chem. Phys. Lett. 1999. 312. 567-571. 

Tian AG, Deng WM. 2008. Lgl and its phosphorylation by aPKC regulate oocyte polarity formation in Drosophila. Development 135(3) 463-471. 

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