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Wide-angle XRD patterns

The simultaneous wide-angle XRD pattern recorded at -8°C in emulsion (Fig. 1, insert) shows a single peak with a SS of 4.21 A on a diffuse peak centered at about 4.5 A corresponding to the X-ray signature of hydrocarbon chains in the liquid state (5). The single peak corresponds to the crystallization of the alkyl chains... [Pg.193]

Lattice parameters calculated from wide-angle XRD patterns of human dental enamel showed no measurable shift when the F content increased from 70 to 670 parts per million (Frazier 1967). However, the 002, 211, 300 and 202 peaks became slightly sharper. The Scherrer formula showed increases in size from 1420 100 to 2740 240, 780 25 to 1030 25 and from 780 20 to 1000 20 A from the 002, 300 and 211 peaks respectively. In the absence of further study, it is not possible to say whether these changes were due to a real increase in size or to a reduction in microstrain. [Pg.434]

Figure 2. Wide-angle XRD patterns of the mesoporous C03O4... Figure 2. Wide-angle XRD patterns of the mesoporous C03O4...
FIGURE 2.20 Wide-angle XRD patterns of different carbon materials (a) CMK-3, (b) an activated carbon, (c) a carbon black, (d) multiwalled carbon nanotubes, and (e) CMK-3 prepared according to Reference 143. (From Kim, T.-W., Park, I.-S., and Ryoo, R. Angew Chem Int Ed. 42 4375-4379, 2003. With permission.)... [Pg.83]

FIGURE 2.24 SAXS patterns of SBA-15 silica template andanOMC sample. (The inset shows the wide-angle XRD patterns of OMC and carbon black XC-72.) (From Sn, F., Zeng, J., Bao, X.Y., Yu, Y, Lee, J.Y., and Zhao, X.S. Chem Mater 17 3960-3967, 2005. With permission.)... [Pg.86]

Fig. 2 Molecular models Illustrating the structural and conformational changes during the transition from (a) cisoid to (b) transoid conformatitni. Optical microscopy images show an extruded fiber sample of the achiral polymer shown in Fig. la. Corresponding wide-angle XRD patterns for the cisoid and transoid conformations are shown below. Reproduced with permission from [50], Copyright 2008 American Chemical Society... Fig. 2 Molecular models Illustrating the structural and conformational changes during the transition from (a) cisoid to (b) transoid conformatitni. Optical microscopy images show an extruded fiber sample of the achiral polymer shown in Fig. la. Corresponding wide-angle XRD patterns for the cisoid and transoid conformations are shown below. Reproduced with permission from [50], Copyright 2008 American Chemical Society...
Figure 9.1 Wide-angle XRD pattern of nano-MHs. Reproduced from reference 36 with permission from the American Chemical Society. Figure 9.1 Wide-angle XRD pattern of nano-MHs. Reproduced from reference 36 with permission from the American Chemical Society.
Fig. 3. Crystalline evolution of triacylglycerols in fat globules of cream. Three-dimensional plots of small- (A) and wide- (B) angle XRD patterns, recorded simultaneously with differential scanning calorimetry (DSC) experiments during heating of cream at 2 C/min from -8 to 50°C. See Figure 1 for other abbreviation. Fig. 3. Crystalline evolution of triacylglycerols in fat globules of cream. Three-dimensional plots of small- (A) and wide- (B) angle XRD patterns, recorded simultaneously with differential scanning calorimetry (DSC) experiments during heating of cream at 2 C/min from -8 to 50°C. See Figure 1 for other abbreviation.
The development during the last few years of methods to obtain wide- and low-angle XRD patterns and IR and Raman spectra from micron-sized regions of tissue is quite notable. These techniques have already provided information on the changes in mineral in different regions of tissue and various stages of mineralization, but much more should be achieved in the future. [Pg.448]

Figure 7(b) shows a typical XRD pattern of oriented clay of odinite and verdine facies minerals. Since the sample was run in the air-dried state, the maximum expected spacing would be 15 A. The odinite spectra have a high background at low angles, a wide, poorly defined peak above 15 A in the air-dried state, and a wide, sharper but asymmetric peak near 7 A. The higher intensity is at 7.2 A. There is a lower intensity band near 7.5 A. The intensity of the total 7 A peak is low compared to the surface area of the wide band above 15 A. These features suggest that odinite is not simply a ferrous 7 A mineral based on a serpentine structure as defined in Bailey (1988). [Pg.3782]

Fig.1. Small- and wide- (insert) angle X-ray diffraction (XRD) patterns recorded at -8°C after quenching of the samples of cream (thick line) and anhydrous milk fat (thin line) from 50°C. Fig.1. Small- and wide- (insert) angle X-ray diffraction (XRD) patterns recorded at -8°C after quenching of the samples of cream (thick line) and anhydrous milk fat (thin line) from 50°C.
We examined the effect of surfactant removal by means of XRD. Fig.2 shows the wide-angle (WA) XRD patterns of mesoporous Ti02 obtained after different CTMACl removal procedures. The XRD patterns show the characteristic of anatase phase (JCPDS 21-1272). Moreover, highly crystalline mesostructure with minor brookite ( ) was obtained when samples were calcined. In fact, the strongest peak in the XRD is sharpened by the calcination at 773 K. On the other hand, the use of cyclohexane and soluble starch improves the cristallinity of the mesoporous Ti02- The crystallite size calculated by the scherer equation fi-om anatase (101) peak is about 23 nm... [Pg.381]

Characterization of periodic mesoporous silicates involved a wide range of techniques. One of the first realizations made was that despite their long-range order, these materials were amorphous in nature, as conclusively demonstrated by Raman spectroscopy, solid-state NMR, and other techniques. As a result, their x-ray diffraction (XRD) patterns were dominated by a limited number of peaks at low angles (Fig. 4), often providing insufficient information with regards to the structure of the materials under investigation. In this... [Pg.855]


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See also in sourсe #XX -- [ Pg.192 , Pg.194 ]




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Pattern angle

Wide-angle

Wide-angle powder XRD patterns

XRD

XRD patterns

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