Ordered Structures from Nanoparticles

Anselmann, Ralf; Winkler, Holger

doi:10.1002/adem.200310097

Cited by 15 publications

(19 citation statements)

References 8 publications

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“…This color originated from the diffraction of light and interference effects because of the presence of the microstructure in the film at this certain angle. The incidence light at this angle was selectively reflected from the plane of the porous film in agreement with the Bragg equation 19. The appearance of a purple color upon reflection was proof of the ideal structure in our AR film.…”

Section: Resultssupporting

confidence: 65%

Porous Polymer Films with Gradient‐Refractive‐Index Structure for Broadband and Omnidirectional Antireflection Coatings

Xiao

Gao

Xue

et al. 2010

Adv Funct Materials

137

110

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Porous polymer films that can be employed for broadband and omnidirectional antireflection coatings are successfully shown. These films form a gradient‐refractive‐index structure and are achieved by spin‐coating the solution of a polystyrene‐block‐poly(methyl methacrylate) (PS‐b‐PMMA)/PMMA blend onto an octadecyltrichlorosilane (OTS)‐modified glass substrate. Thus, a gradient distribution of PMMA domains in the vertical direction of the entire microphase‐separated film is obtained. After those PMMA domains are removed, a PS porous structure with an excellent gradient porosity ratio in the vertical direction of the film is formed. Glass substrates coated with such porous polymer film exhibit both broadband and omnidirectional antireflection properties because the refractive index increases gradually from the top to the bottom of the film. An excellent transmittance of >97% for both visible and near‐infrared (NIR) light is achieved in these gradient‐refractive‐index structures. When the incident angle is increased, the total transmittance for three different incident angles is improved dramatically. Meanwhile, the film possesses a color reproduction character in the visible light range.

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Section: Resultssupporting

confidence: 65%

Porous Polymer Films with Gradient‐Refractive‐Index Structure for Broadband and Omnidirectional Antireflection Coatings

Xiao

Gao

Xue

et al. 2010

Adv Funct Materials

137

110

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show abstract

“…These supraparticles can be fabricated very easily and relatively quickly, but as a result of the curved surface, they necessarily contain many defects. These defects are highly visible in similar samples produced by Merck,31 which tested spray drying to accelerate the growth still further. It is possible that this fabrication method additionally increases the defect concentration.…”

Section: Opal Shapesmentioning

confidence: 92%

Opals: Status and Prospects

et al. 2009

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The beauty of opals results from a densely packed, highly ordered arrangement of silica spheres with a diameter of several hundred nanometers. Such ordered nanostructures are typical examples of materials called photonic crystals, which can be formed by known microstructuring methods and by self-assembly. Opals represent a self-assembly approach to these structured media; such an approach can lead to novel materials for photonics, photocatalysis, and other areas. Although self-assembly leads to many types of defects, resulting in the surprising and very individual appearance of natural opals, it causes also difficulties in technological applications of opal systems.

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“…The three-dimensional structuration of mm-sized particles to ordered crystalline and facetted superstructures on surfaces has already been described (for a recent review, see reference [18]). The structuration of monodispersed spherical nano-or microparticles to colloidal crystals has also been investigated extensively (for a recent review, see reference [19]). Fewer studies of the three-dimensional structuration of nonspherical nanocrystals to facetted crystals have been reported.…”

Section: Introductionmentioning

confidence: 99%

Polymer‐Induced Alignment of dl‐Alanine Nanocrystals to Crystalline Mesostructures

Wohlrab

Pinna

Antonietti

et al. 2005

Chemistry A European J

162

151

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Crystallization of DL-alanine by cooling of a supersaturated solution in the presence of a chiral double-hydrophilic block copolymer poly(ethylene glycol)-block-poly(ethylene imine)-S-isobutyric acid (PEG4700-PEI1200-S-iBAc) yields crystal superstructures with an astonishing morphology. Although analysis by light microscopy reveals these crystals to be apparently well facetted, electron microscopy shows that they consist of three-dimensionally, well-aligned nanocrystals that are scaffolded to a so-called mesocrystal. This mesocrystal is formed by polymer-mediated structuration, and provides evidence for the importance of mesoscopic events in a typical crystallization process.

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Ordered Structures from Nanoparticles

Cited by 15 publications

References 8 publications

Porous Polymer Films with Gradient‐Refractive‐Index Structure for Broadband and Omnidirectional Antireflection Coatings

Porous Polymer Films with Gradient‐Refractive‐Index Structure for Broadband and Omnidirectional Antireflection Coatings

Opals: Status and Prospects

Polymer‐Induced Alignment of dl‐Alanine Nanocrystals to Crystalline Mesostructures

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