scholarly journals Unusual packing of soft-shelled nanocubes

2019 ◽  
Vol 5 (5) ◽  
pp. eaaw2399 ◽  
Author(s):  
Fang Lu ◽  
Thi Vo ◽  
Yugang Zhang ◽  
Alex Frenkel ◽  
Kevin G. Yager ◽  
...  
Keyword(s):  
Decisive Role ◽  
Anisotropic Shell ◽  
Particle Packing ◽  
Body Centered Cubic ◽  
X Ray ◽  
X Ray Scattering ◽  
Cubic Phases ◽  
Shaped Nanoparticles ◽  
Soft Shell ◽  
Packing Effects

Space-filling generally governs hard particle packing and the resulting phases and interparticle orientations. Contrastingly, hard-shaped nanoparticles with grafted soft-ligands pack differently since the energetically interacting soft-shell is amenable to nanoscale sculpturing. While the interplay between the shape and soft-shell can lead to unforeseen packing effects, little is known about the underlying physics. Here, using electron microscopy and small-angle x-ray scattering, we demonstrate that nanoscale cubes with soft, grafted DNA shells exhibit remarkable packing, distinguished by orientational symmetry breaking of cubes relative to the unit cell vectors. This zigzag arrangement occurs in flat body-centered tetragonal and body-centered cubic phases. We ascribe this unique arrangement to the interplay between shape and a spatially anisotropic shell resulting from preferential grafting of ligands to regions of high curvature. These observations reveal the decisive role played by shell-modulated anisotropy in nanoscale packing and suggest a plethora of new spatial organizations for molecularly decorated shaped nanoparticles.

X-ray scattering by bicontinuous cubic phases

1994 ◽  
Vol 4 (2) ◽  
pp. 275-286 ◽  
Author(s):  
M. Clerc ◽  
E. Dubois-Violette
Keyword(s):  
X Ray ◽  
X Ray Scattering ◽  
Cubic Phases ◽  
Bicontinuous Cubic ◽  
Ray Scattering

scholarly journals Melting and Sintering of a Body-Centered Cubic Superlattice of PbSe Nanocrystals Followed by Small Angle X-ray Scattering

2011 ◽  
Vol 115 (14) ◽  
pp. 6397-6404 ◽  
Author(s):  
Brian W. Goodfellow ◽  
Reken N. Patel ◽  
Matthew G. Panthani ◽  
Detlef-M. Smilgies ◽  
Brian A. Korgel
Keyword(s):  
Small Angle ◽  
Body Centered Cubic ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Three-dimensional periodic complex structures in soft matter: investigation using scattering methods

2012 ◽  
Vol 2 (5) ◽  
pp. 589-601 ◽  
Author(s):  
Marianne Impéror-Clerc
Keyword(s):  
Soft Matter ◽  
Hexagonal Phase ◽  
Three Dimensional ◽  
Structural Models ◽  
Close Packing ◽  
Complex Structures ◽  
Structured Materials ◽  
X Ray ◽  
X Ray Scattering ◽  
Cubic Phases

Three-dimensional periodic complex structures are encountered in various soft matter systems such as liquid crystals, block-copolymer phases and the related nano-structured materials. Here, we review several well-defined topologies: two-dimensional hexagonal phase, three-dimensional packing of spheres, tetrahedral close packing ( tcp ) bi-continuous and tri-continuous cubic phases. We illustrate how small-angle X-ray scattering experiments help us to investigate these different structures and introduce the main available structural models based on both direct and inverse methods.

Control and Analysis of Oriented Thin Films of Lipid Inverse Bicontinuous Cubic Phases Using Grazing Incidence Small-Angle X-ray Scattering

Langmuir ◽  
2013 ◽  
Vol 29 (31) ◽  
pp. 9874-9880 ◽  
Author(s):  
Martyn Rittman ◽  
Heinz Amenitsch ◽  
Michael Rappolt ◽  
Barbara Sartori ◽  
Benjamin M. D. O’Driscoll ◽  
...  
Keyword(s):  
Thin Films ◽  
Small Angle ◽  
Grazing Incidence ◽  
X Ray ◽  
X Ray Scattering ◽  
Cubic Phases ◽  
Bicontinuous Cubic ◽  
Ray Scattering

Simultaneous Rheology and Small-Angle Scattering Experiments on Block Copolymer Gels and Melts in Cubic Phases

1998 ◽  
Vol 31 (6) ◽  
pp. 881-889 ◽  
Author(s):  
I. W. Hamley ◽  
J. A. Pople ◽  
A. J. Gleeson ◽  
B. U. Komanschek ◽  
E. Towns-Andrews
Keyword(s):  
Block Copolymer ◽  
Small Angle ◽  
Large Amplitude ◽  
Cubic Phase ◽  
Shear Direction ◽  
X Ray ◽  
X Ray Scattering ◽  
Cubic Phases ◽  
Bicontinuous Cubic ◽  
Ray Scattering

A new instrument for simultaneous small-angle X-ray scattering and rheology experiments on soft solids is described. This device is based on a commercial rheometer with a shear sandwich geometry in which the sample is subjected to a planar oscillatory deformation. This instrument has been used for time-resolved small-angle X-ray scattering/rheology experiments at the Synchrotron Radiation Source, Daresbury Laboratory, England. The focus has been in particular on the effect of large-amplitude shearing on the orientation of cubic phases in gels of block copolymers formed in concentrated solutions, and on the bicontinuous cubic phase of a block copolymer melt. Representative results are presented for face-centred cubic (f.c.c.) and body-centred cubic (b.c.c.) phases in gels of poly(oxyethylene)–poly(oxybutylene) diblock copolymers, and for the bicontinuous cubic `gyroid' structure in a poly-(ethylene-alt-propylene)–poly(dimethylsiloxane) di-block copolymer melt. The orientations of the micellar b.c.c. phases in the gels and the gyroid structure (belonging to the b.c.c. space group Ia\bar 3d) following large-amplitude shearing are shown to be the same,i.e.directionally oriented crystals are produced in both cases, in which (111) directions are oriented along the shear direction.

Molecular Packing in Double Gyroid Cubic Phases Revealed via Resonant Soft X-Ray Scattering

2020 ◽  
Vol 125 (2) ◽  
Author(s):  
Yu Cao ◽  
Mohamed Alaasar ◽  
Asritha Nallapaneni ◽  
Mirosław Salamończyk ◽  
Peter Marinko ◽  
...  
Keyword(s):  
Molecular Packing ◽  
X Ray ◽  
X Ray Scattering ◽  
Cubic Phases ◽  
Double Gyroid ◽  
Ray Scattering

Phase Composition of Plasma-Sprayed Yttria Stabilized Zirconia

1997 ◽  
Author(s):  
J. Ilavsky ◽  
J.K. Stalick
Keyword(s):  
Phase Composition ◽  
Xrd Analysis ◽  
Cubic Phase ◽  
Spray Distance ◽  
Future Studies ◽  
X Ray ◽  
X Ray Scattering ◽  
Yttria Content ◽  
Cubic Phases ◽  
Plasma Sprayed

Abstract The phase composition of plasma sprayed (8wt%) YSZ was studied using neutron and X-ray scattering. Comparison shows that neutron scattering is superior for analysis of the phase composition as well as for the analysis of the yttria content of the tetragonal phase. The presence of large amounts of the cubic phase are probably often neglected in standard XRD analysis due to scattering-related limitations and the inherent difficulty of the analysis. The importance of this fact needs to be addressed in future studies. The amount of monoclinic, tetragonal, and cubic phases was determined for as-sprayed deposits and for samples annealed at various temperatures. The as-sprayed deposit was composed of metastable phases, and the phase composition on annealing did not change significantly until 1400 °C for one hour. This indicates the relative stability of the phase composition. The influence of the spray distance is not clear, but the resultant phase composition may be related to the deposition temperature.

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