Inverse gold photonic crystals and conjugated polymer coated opals for functional materials

Landon, Preston B.; Gutierrez, Jose J.; Martínez, Itzel Lucio; Giridharagopal, Rajiv; Wu, Yi Chieh; Lee, Sergey; Parikh, Kunjal; Gillespie, J.; Ussery, Geoffrey; Karimi, Behzad; Baughman, Ray H.; Zakhidov, Anvar A.; Glosser, R.

doi:10.1016/s0921-4526(03)00480-0

Cited by 8 publications

(8 citation statements)

References 11 publications

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“…This creates non-crystalline structures that are a mixture of the face centered cubic (FCC) and hexagonal close packed crystal lattices; however, SEM images of opalescent crystallites in our well ordered silica opals fabricated from spheres with various diameters (200nm-1500nm) indicate that the opalescent crystallites formed from sedimenting spheres oriented vertically along the [100] direction of the FCC lattice ( Figure 2d) 10,11 . This finding is supported by recent Kossel line images of sedimenting colloidal spheres.…”

Section: Self-assembly Of Synthetic Silica Opalsmentioning

confidence: 96%

“…Large spheres with diameters larger than a micron have, proven to be very temperamental and difficult to control 17,18 . 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 .…”

Section: Effect Of Sphere Diametermentioning

confidence: 99%

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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: Self-assembly Of Synthetic Silica Opalsmentioning

confidence: 96%

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

Self Cite

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show abstract

“…This creates noncrystalline structures that are a mixture of the face-centered cubic (FCC) and hexagonal close-packed crystal lattices; however, SEM images of opalescent crystallites in our well-ordered silica opals fabricated from spheres with various diameters (200-1500 nm) indicate that the opalescent crystallites formed from sedimenting spheres vertically oriented along the [100] direction of the FCC lattice ( Fig. 4a) [2,7]. This finding is supported by recent Kossel line images of sedimenting colloidal spheres.…”

Section: Lattice Growth Direction Of Sedimenting Colloidal Spheresmentioning

confidence: 97%

“…A currently explored route fabrication of photonic crystals uses a crystalline lattice constructed of colloidal spheres. The voids between the spheres are filled with a high-dielectric-constant material, after which the spheres are removed [2,3]. While this method has been used to create prototype photonic crystals, controlling the assembly of colloidal spheres into a relatively defect-free crystal lattice, necessary for the unique optical properties to manifest, has been very difficult.…”

Section: Introductionmentioning

confidence: 99%

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

Landon

Glosser

2004

Journal of Colloid and Interface Science

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“…Encapsulated red blood cells were self-assembled into small structures, dried in air and slowly heated under vacuum up to 500°C over several hours (Figure 2a). The sintering process thermally converted the remaining gold chloride to metallic gold 16,17 .…”

Section: Gold Coated Red Blood Cellsmentioning

confidence: 99%

Apoptosis method for biomimetic artificial cell membranes employing nanophotonic theranostics

et al. 2005

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Colloidal biomimetic disc shaped metallic gold shells with a uniform size distribution were synthesized using red blood cells as sacrificial templates. Red blood cells do not reproduce by dividing; hence they are truly colloidal particles. They are almost completely filled with hemoglobin allowing for an extremely dynamic work cycle with long intercellular vacations separated by self-destructive workloads on the cell surface. This method of exchange is emulated in the presented research. The colloidal disc shaped gold shells were coated with multiple layers of 50nm fluorescent polystyrene spheres followed by chemical removal of the gold core. This process yielded hollow synthetic biomimetic membranes with a strong optical signature that are diffusely permeable to water and impervious to particles larger than a few nanometers. Currently, the most successful synthetic intravascular oxygen carrying materials are perfluorocarbons; however, they break down quickly in roughly 50 hours from overexposure to their in vivo workload. The meso-porous membrane cages will be filled with hundreds of fibrous spheroid conglomerates composed of perfluorocarbon chains that can protrude through the meso-porous membrane as they thermally jostle about the cage. This is to statistically limit the exposure time of individual polymer strands to the self-destructive work at the surface and hopefully will greatly increase the effective functioning lifetime of the perfluorocarbon-based synthetic red blood cell. The artificial membranes are intentionally designed to be weak allowing them to flex under normal pressures and to hopefully burst under more extreme conditions such as blockage.

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Inverse gold photonic crystals and conjugated polymer coated opals for functional materials

Cited by 8 publications

References 11 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

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

Apoptosis method for biomimetic artificial cell membranes employing nanophotonic theranostics

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