Double hexagonal close-packed structure revealed in a single colloidal crystal grain by Bragg rod analysis (original) (raw)
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Optics Express, 2012
A coherent x-ray diffraction experiment was performed on an isolated colloidal crystal grain at the coherence beamline P10 at PETRA III. Using azimuthal rotation scans the three-dimensional (3D) scattered intensity in reciprocal space from the sample was measured. It includes several Bragg peaks as well as the coherent interference around these peaks. The analysis of the scattered intensity reveals the presence of a plane defect in a single grain of the colloidal sample.
Physical Review Letters, 2016
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Bragg Rods and Multiple X-Ray Scattering in Random-Stacking Colloidal Crystals
Physical Review Letters, 2003
Synchrotron small-angle x-ray diffraction images of random-stacking-induced Bragg scattering rods are obtained in a wide range of wave vectors from a single colloidal crystal. The results reveal a strong multiple scattering effect, which leads to new features in the diffraction pattern -secondary Bragg rods. We argue that dynamic x-ray diffraction is rather common for high-quality colloidal photonic crystals and should be taken into account.
Structure and stacking order in crystals of asymmetric dumbbell-like colloids
Journal of Applied Crystallography, 2015
Author(s) of this paper may load this reprint on their own web site or institutional repository provided that this cover page is retained. Republication of this article or its storage in electronic databases other than as specified above is not permitted without prior permission in writing from the IUCr.
Ultra-Small-Angle X-ray Scattering Profile of Colloidal Silica Crystal of 4-fold Symmetry
J Am Chem Soc, 1995
Several orders of Bragg diffraction were observed by ultra-small-angle X-ray scattering (USAXS) for colloidal silica particles with the average radius being 560 8, and with narrow size distribution (standard deviation being 8%) in a salt-free aqueous dispersion in a capillary. Diffraction peaks were displayed at such small angles as 149 x n" with n being an integer. The same profile was observed when the capillary was rotated around its axis by (90 x m)" (m: integer). Furthermore, a different profile was found at (45 + 90 x m)" with the first peak at 109".
Physical Review Letters, 2002
The long-range order parameters in single crystals of hard colloidal spheres grown in sediments of colloid-polymer mixtures are determined using synchrotron small-angle x-ray diffraction with a resolution of 10 26 of the wave vector. The interplanar positional order derived from the width of lattice reflections extends over at least 500 lattice planes. The lattice planes are orientationally correlated within ϳ0.1 ± throughout the crystals, whereas the stacking of hexagonal planes remains random.
X-ray Diffraction of Photonic Colloidal Single Crystals
Langmuir, 1997
We have resolved a great number of Bragg peaks of photonic colloidal single crystals by synchrotron small angle X-ray scattering (SAXS). We find that charge-stabilized colloids form face-centered cubic crystals at all densities up to ∼60 vol %. The colloidal particles are highly ordered on their lattice sites, which confirms that these self-organizing materials are suitable building blocks for optical photonic matter. The experiments demonstrate that synchrotron SAXS with two-dimensional detection is a powerful tool to study systems with length scales comparable to optical wavelengths.
Characterization of Photonic Colloidal Single Crystals by Microradian X-ray Diffraction
Advanced Materials, 2006
Photonic crystals (PCs) can provide unprecedented control over both the emission and the propagation of light, allowing important applications in, for example, infrared telecommunications. However, fabrication and characterization of PCs is challenging owing to the large refractive-index contrast that is needed to open up a photonic bandgap. Here we demonstrate that microradian X-ray diffraction can be used to characterize various (inverse) PCs with lattice spacings as large as 1.3 lm at different stages of their fabrication. We have even fabricated non-close-packed (non-cp) PC structures by selfassembly of colloidal microspheres in an external electric field. Inverse PCs have been obtained by infiltration of the colloidal-crystal templates with amorphous silicon. The size of the colloidal particles allows us to characterize the internal 3D structure of these crystal templates in both real and reciprocal space.
Coherent x-ray imaging of defects in colloidal crystals
Physical Review B, 2010
Coherent x-ray diffractive imaging ͑CXDI͒ was applied to reveal the structure of colloidal crystals. The colloidal sample was illuminated by a coherent x-ray beam through a 7 m pinhole aperture. The resulting diffraction patterns contain several Bragg peaks and an additional interference structure between the peaks due to the coherent illumination of a finite part of the sample. The inversion of these diffraction patterns reveals the arrangement of colloidal particles in a face-centered cubic ͑fcc͒ lattice as well as defects in the form of stacking faults in the ͑111͒ planes.