Self-assembly of spherical colloidal silica along the [100] direction of the FCC lattice and geometric control of crystallite formation

Landon, Preston B.; Glosser, R.

doi:10.1016/j.jcis.2004.01.021

Cited by 16 publications

(10 citation statements)

References 7 publications

(10 reference statements)

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“…Utilization of the rock principle (described in section 3) and by creating starburst patterns from the controlled drying of samples described elsewhere 18,19,20 , Opalescent crystallites with 1-2mm diameters were formed in the samples (1000-2300nm) possessing a shallow solution depth, less than 3cm and a silica volume fraction of about 5 percent 17,18 . The resulting dried opals were relatively thin (1-3mm) and not much taller then the top of the curve around the sides of the containers in which they were formed.…”

Section: Effect Of Sphere Diametermentioning

confidence: 99%

Inverse opal photonic crystals with photonic band gaps in the visible and near-infrared

Jarvis

Gilleland

Renfro

et al. 2005

Complex Mediums VI: Light and Complexity

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Colloidal silica spheres with 200nm, 250nm, and 290nm diameters were self-assembled with single crystal crystallites 4-5mm wide and 10-15mm long. Larger spheres with diameters between 1000-2300nm were self-assembled with single crystal crystallites up to 1.5mm wide and 2mm long. The silica opals self-assembled vertically along the [100] direction of the face centered cubic lattice resulting in self-templated opals. Inverse opal photonic crystals with a partial band gap possessing a maximum in the near infrared at 3.8µm were constructed from opal templates composed of 2300nm diameter spheres with chalcogenide Ge 33 As 12 Se 55 (AMTIR-1), a transparent glass in the near infrared with high refractive index. Inverse gold and gold/ polypropylene composite photonic crystals were fabricated from synthetic opal templates composed of 200-290nm silica spheres. The reflectance spectra and electrical conductance of the resulting structures is presented. Gold was infiltrated into opal templates as gold chloride and heat converted to metallic gold. Opals partially infiltrated with gold were co-infiltrated with polypropylene plastic for mechanical support prior to removal of the silica template with hydrofluoric acid.

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Section: Effect Of Sphere Diametermentioning

confidence: 99%

Inverse opal photonic crystals with photonic band gaps in the visible and near-infrared

Jarvis

Gilleland

Renfro

et al. 2005

Complex Mediums VI: Light and Complexity

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“…3,4) Colloidal crystals formed from monosized particles of approximately 240 nm in diameter exhibit Bragg reflection in the visible light region, giving them a beautiful luster (iridescence), 5,6) which is the same coloring mechanism in precious natural opals 7) (gem opals). Several self-assembly techniques, such as convective (or meniscus), [8][9][10] spin coating, 11,12) drop and dry, 13) share flow, 14,15) and sedimentation 6,[16][17][18] methods are applied to the synthesis of colloidal crystals, but only the last technique provides bulk-size (>1 cm 3 in volume) crystals.…”

Section: Introductionmentioning

confidence: 99%

Detailed microscopic observations of the structure of bulk colloidal crystals grown by sedimentation

Ohki

Nakano

Kawanaka

et al. 2018

Jpn. J. Appl. Phys.

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Since the actual and microscopic structure of hard-sphere-type colloidal crystals has not been fully understood, we performed detailed microscopic structural characterization of the sedimentation-grown opal-type colloidal crystals by conventional optical microscopy, laser conforcal microscopy, and secondary electron microscopy. It is directly proved for the first time, to the best of our knowledge, that iridescent striations originate from the repetition of twin structures and stacking faults in crystal structures. We propose “subdomain” as an intrinsic constitutional unit of a monocolored iridescent “domain” and the subdomain boundary is defined as the envelope of the edges of stacking faults. Every domain forming the bulk crystal contains a high concentration of slanted stacking faults at various tilt angles inherent to the domain. These observations show that the bulk colloidal crystals can be described in terms of five stages of hierarchical structure units, bulk crystal, domains, sub-domains, pristine single-crystal lamellae, and silica particles.

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“…Colloidal particles with specific shape and function [1,2] are currently a subject of intense investigation for the development of pigments [3], microcapsules [3,4], guided drug carriers [5,6], synthetic opals [7], transparent metals [8], photonic crystals [7,8], thin-film transistors, organic light emitting diodes [9], solar cells [10,11], and tunable lasers [12].…”

Section: Introductionmentioning

confidence: 99%

“…The colloidal nature of RBCs and their unique shape motivated us to fabricate metallic colloidal particles using them as templates. Several potential commercial applications are envisioned [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Hollow Disc and Sphere-Shaped Particles from Red Blood Cell Templates

Landon

Gutierrez²,

Alvarado³

et al. 2008

Research Letters in Physical Chemistry

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Self-assembly of spherical colloidal silica along the [100] direction of the FCC lattice and geometric control of crystallite formation

Cited by 16 publications

References 7 publications

Inverse opal photonic crystals with photonic band gaps in the visible and near-infrared

Inverse opal photonic crystals with photonic band gaps in the visible and near-infrared

Detailed microscopic observations of the structure of bulk colloidal crystals grown by sedimentation

Hollow Disc and Sphere-Shaped Particles from Red Blood Cell Templates

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