Large-Scale Colloidal Self-Assembly by Doctor Blade Coating

Yang, Hongta; Peng, Jiang

doi:10.1021/la101721v

Cited by 157 publications

(100 citation statements)

References 68 publications

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“…When the refractive indexes of such media and the silica particles are nearly matched, repulsion force between the particles become dominant, which results in colloidal structures with long-range order. To control the overall shape of composite colloidal crystals, doctor-blade coating and spin-coating processes are used for fl at fi lms [17,18], and confi ned geometries have been adapted for other shapes such as spheres, ellipsoids, fi bers and lined structures [19]. Formation processes involving dispersion in crosslinkable or polymerizable liquid and solidifi cation are much faster than conventional crystallization processes such as evaporation, sedimentation, fi ltration or dip-coating from colloidal solution in evaporable liquids [20][21][22][23].…”

Section: Colloidal Crystalsmentioning

confidence: 99%

Self-assembled colloidal structures for photonics

et al. 2011

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A s dielectric structures with a submicrometer length scale can interact strongly with light, various remarkable optical responses can be designed and tailored depending on the types and parameters of their structures. Over the past few decades, the unusual optical properties of the periodic dielectric structures called photonic crystals have been investigated intensively [1]. Many research groups have endeavored to engineer the optical properties of photonic crystals, including photonic bandgaps, 'slow' photons, negative refraction and other properties, or to use them in practical applications. Two-dimensional (2D) structures, which are mostly prepared by conventional lithographic processes, were demonstrated initially, in which total internal refl ections were adopted for confi ning the light in a nonperiodic third direction, and their use has been investigated in some limited applications [2]. Th ree-dimensional (3D) structures have also been investigated intensively because of their complete photonic bandgaps in certain structures, a critical property for controlling light in 3D space. Research on such structures has been supported by the recent development of facile fabrication methods, including the selfassembly of simple monodisperse particles, also known as colloidal self-assembly [3], block copolymer self-assembly [4], the auto-cloning process [5] and holographic lithography [6]. Of these methods, colloidal self-assembly is the most promising for the low-cost production of 2D and 3D photonic crystals over large areas or with various shapes [7,8]. Schematic diagrams of the basic colloidal crystal structure along with inverse and short-range-ordered scattering structures for photonic applications are shown in Figure 1. Disordered dielectric structures of monodisperse particles called photonic glasses have begun to be investigated as another class of photonic nanostructures that can manifest some unusual optical phenomena such as random lasing, strong light localization and long-range intensity correlations. In this review article, we describe self-assembled colloidal photonic nanostructures in brief and summarize recent achievements in the fi eld of colloidal photonic nanostructures and their applications. Fabrication of photonic nanostructures by colloidal assembly Colloidal crystalsSince Vanderhoff 's serendipitous discovery of a synthetic method for preparing monodisperse polymer colloids [9], the method has been extended to the preparation of a variety of polymeric colloids and also to the processing of inorganic colloidal particles such as silica, titania and iron oxide. As long as particles are stable in liquid and their size distribution is suffi ciently narrow, they can be crystallized in a facecentered cubic (fcc) lattice by increasing their volume fraction through any concentration process, such as controlled evaporation, sedimentation or fi ltration. In general, the interparticle forces can be described by summing over the various potentials from diff erent origins, including intermolecular for...

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Section: Colloidal Crystalsmentioning

confidence: 99%

Self-assembled colloidal structures for photonics

et al. 2011

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“…All the process is performed under controlled humidity [72][73][74][75][76][77][78]. In the doctor-blade technique an immobilized blade applies a unidirectional shear force to the polymer solution that passes through a small gap between the blade and the substrate [79][80]84]. When honeycomb patterns are obtained with the dipcoating the solid substrate is pulled with a constant speed from the evaporated polymer solutions [46,54,58,[81][82][83].…”

Section: Processes Used For Breath-figures Self-assemblymentioning

confidence: 99%

Breath-Figures Self-Assembly, the Versatile Method of Manufacturing Membranes and Porous Structures: Physical, Chemical and Technological Aspects

Bormashenko¹

2017

Preprint

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Abstract:The review is devoted to the physical, chemical and technological aspects of the breath-figures self-assembly process. Main stages of the process and the impact of the polymer architecture and physical parameters of the breath-figures self-assembly on the eventual pattern are covered. The review is focused on the hierarchy of spatial and temporal scales inherent for the breath-figures self-assembly. Multi-scale patterns arising from the process are addressed. The characteristic spatial lateral scales of patterns vary from nanometers to dozens of micrometers. The temporal scales of the process span from micro-seconds to seconds. The qualitative analysis performed in the paper demonstrates that the process is mainly governed by the interfacial phenomena, whereas the impact of inertia and gravity is negligible. Characterization and applications of polymer films manufactured with breath-figures self-assembly are discussed.

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“…The presented hexagonal plane is the (111) plane of the FCC structure. It has been shown by A. Mihi et al 6 , H. Yang et al 7 and Y. L. Wu 8 that application of external forces during spincoating or doctor blading can result in the formation of an FCC with different orientations than (111) FCC. Here, we have selected a rectangular ground plane i.e.…”

Section: Manufacturing and Characterization Of Colloidal Crystalsmentioning

confidence: 99%

Development of photonic crystal structures for on-board optical communication

Khan¹,

Justice²,

Boersma

et al. 2014

Photonic Crystal Materials and Devices XI

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We present designs for sharp bends in polymer waveguides using colloidal photonic crystal (PhC) structures. Both silica (SiO 2 ) sphere based colloidal PhC and core-shell colloidal PhC structures having a titania (TiO 2 ) core inside silica (SiO 2 ) shells are simulated. The simulation results show that core-shell Face Centered Cubic (FCC) colloidal crystals have a sufficient refractive index contrast to open up a bandgap in the desired direction when integrated into polymer waveguides and can achieve reflection >70% for the appropriate plane. Different crystal planes of the FCC structure are investigated for their reflection and compared with the calculated bandstructure. Different techniques for fabrication of PhC on rectangular seed layers namely slow sedimentation; spin coating and modified doctor blading are discussed and investigated. FCC and Random FCC silica structures are characterized optically to show realisation of (001) FCC.

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Large-Scale Colloidal Self-Assembly by Doctor Blade Coating

Cited by 157 publications

References 68 publications

Self-assembled colloidal structures for photonics

Self-assembled colloidal structures for photonics

Breath-Figures Self-Assembly, the Versatile Method of Manufacturing Membranes and Porous Structures: Physical, Chemical and Technological Aspects

Development of photonic crystal structures for on-board optical communication

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