Fingerprint texture temperature

However, temperature dependence of the twist (the pitch was determined from fingerprint textures) follows Eq. (1) and in both cases gives positive... 

Chiral dithienylcyclopentene compounds can also be used to induce the cholesteric-isotropic phase transition [36]. A cholesteric polygonal fingerprint texture was exhibited by 10 wt% of 2 as a mesogenic dopant in a conventional achiral nematic 5CB as shown in Figure 5.6a. The cholesteric phase to isotropic transition temperature for the doped 5CB was 42 C. With UV irradiation at 310 nm (30 mW cm ) for 30 s, the sample went into the isotropic phase (Fig. 5.6b) whereas upon visible fight irradiation at 670 nm a reverse process was reached within 30 min (Fig. 5.6c). 

Figure 7 Liquid-crystal textures observed for PyAG-l 8 under the polarizing microscope as a function of temperature (a) and (b) wormlike textures found in the 60°C to 110°C range (c) the pseudofocal conic texture observed at 110°C (d) the transition phase occurring at 130°C, and (e) the cholesteric fingerprint texture observed at 180°C. (Taken from J. Watanabe and Y. Takashina. Polym. J. 24 709, 1992. With permission.)...

The fingerprint texture of a chirally doped chromonic drug N phase. This sample shows the N -t I phase of a 5% solution of arginine in a 22% sample of DSCG at room temperature. The separation of the striations corresponds to 1/2 the pitch of the helicoidal structure. (x300, crossed polars.)... 

Disordered carbons usually exhibit a multiscale organization (structure, microtexture, texture)4. Structurally, they are made of more or less distorted polyaromatic layers, nanometric in size. The spatial association or the layers, from the nanometric to the micrometric scales, gives rise to different microtextures (lamellar, porous, concentric, fibrous, etc.) forming the carbons skeleton4. The multiscale organization is the fingerprint of the kind of precursor and of the formation conditions (temperature, pressure, strains, time, etc.) met either in laboratory experiments or in Nature, and is directly related with numerous properties. 

In summary, the nature of the hybrid therefore allows, to some extent, the control of both texture and morphology of the tin dioxide materials obtained after calcination. Nevertheless, treatment at 500 °C leads to similar BET surface area and mean crystallite size, which shows that annealing at very high temperature erases completely the fingerprint of the organic linker. 

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