Colloidal Crystal Beads as Supports for Biomolecular Screening

Zhao, Xiangwei; Cao, Yun; Ito, Fuyumi; Chen, Haihua; Nagai, Keiji; Zhao, Yuhua; Gu, Zhongze

doi:10.1002/ange.200601302

Cited by 20 publications

(19 citation statements)

References 25 publications

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“…The ion-exchange www.chemeurj.org process involved proves to be an effective route for the preparation of highly monodisperse metal-sulfide (other than Cd) colloidal spheres, which may find applications in various areas, such as foams, pigments, and sensor fabrication. [14][15][16][17] Assembly of CSCS to thin films and their optical properties: Because of their uniform size and shape, the CSCS may be used as suitable building blocks for the formation of photonic crystals, photonic balls, and functional films. Homogenous thin films (Figure 9a,b) have been fabricated through spincoating of CSCS (sized at 380 and 280 nm, respectively) dispersed in volatile media.…”

Section: Nanocrystals One Typical Hrtem Image Of Cds Spheres (Reactimentioning

confidence: 99%

“…[12,13] These colloidal spheres can also be applied in various areas, such as catalysis, ceramics, foams, pigments, and sensor fabrication. [14][15][16][17] Due to the importance of these spheres in various applications, there have been studies on synthetic approaches for monodisperse CdS or other metal-sulfide colloidal spheres. Several techniques, [18][19][20][21][22][23][24][25][26][27] including homogeneous deposition (or nucleation) and "gel-sol" techniques, have been successfully developed to obtain uniform CdS and ZnS colloidal spheres.…”

Section: Introductionmentioning

confidence: 99%

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Controlled Synthesis, Growth Mechanism, and Properties of Monodisperse CdS Colloidal Spheres

et al. 2007

Chemistry A European J

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Highly monodisperse submicrometer CdS colloidal spheres (CSCS) with a controllable and tunable size (between 80 and 500 nm) have been synthesized through a facile solvothermal technique. Owing to the controllability of the reaction process, the growth mechanism of the colloidal spheres has been elucidated in detail. The whole growth process can be summarized as homogenous and slow nucleation of nanocrystals, formation of "cores" through 3D-oriented attachment of nanocrystals, and further surface-induced growth to monodisperse colloidal spheres through in situ formation and random attachment of additional nanocrystals. It has been demonstrated that the obtained CSCS colloidal particles are able to be assembled into films which show characteristic stop band gaps of photonic crystals. By using the CSCS as a template, Ag2S, Bi2S3, Cu2S, HgS, and Sb2S3 colloidal spheres, which are difficult to obtain directly, have also been prepared successfully through ion exchange.

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Section: Nanocrystals One Typical Hrtem Image Of Cds Spheres (Reactimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis, Growth Mechanism, and Properties of Monodisperse CdS Colloidal Spheres

et al. 2007

Chemistry A European J

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“…The resulting so‐called bioPhC can detect 1 μg mL −1 levels of anti‐human IgG. Recently, Gu and co‐workers227 reported on the physical adsorption of IgG on PMMA nanoparticles possessing structural colors. FITC‐labeled (FITC=fluorescein isothiocyanate) anti‐IgG antibodies bind to these particles, as demonstrated by measuring both the changes in the reflectivity and the intensity of the fluorescence (Figure 13).…”

Section: Biosensors Based On Photonic Crystalsmentioning

confidence: 99%

Photonic Crystals for Chemical Sensing and Biosensing

2014

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This Review covers photonic crystals (PhCs) and their use for sensing mainly chemical and biochemical parameters, with a particular focus on the materials applied. Specific sections are devoted to a) a lead-in into natural and synthetic photonic nanoarchitectures, b) the various kinds of structures of PhCs, c) reflection and diffraction in PhCs, d) aspects of sensing based on mechanical, thermal, optical, electrical, magnetic, and purely chemical stimuli, e) aspects of biosensing based on biomolecules incorporated into PhCs, and f) current trends and limitations of such sensors.

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“…The colloids form dislocations composed of a series of fivefold and sevenfold defects to accommodate the nonzero curvature, and the number of dislocations increases as the curvature decreases. The formation of 3D spherical crystals has been mostly studied using slowly shrinking drops, which predominantly results in isotropic supraballs composed of repeated layers from the spherical surface toward the center, where each layer is composed of a hexagonal array of colloidal particles; here, we refer to the structure as an onion‐like structure. However, as each layer has many dislocations identical to those for colloids confined to a 2D spherical surface, the supraball contains a high density of defects, which is expected to be energetically unfavorable.…”

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Photonic Microcapsules Containing Single‐Crystal Colloidal Arrays with Optical Anisotropy

et al. 2019

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bcc) structures, [6,7] none of which are compatible with curved surfaces. Therefore, it is difficult to predict the optimum colloidal arrangement in a spherical geometry.The optimum arrangement of colloids confined to a 2D spherical surface has been thoroughly investigated using Pickering emulsions, or particle-stabilized emulsions, as a model system. [8] The colloids form dislocations composed of a series of fivefold and sevenfold defects to accommodate the nonzero curvature, and the number of dislocations increases as the curvature decreases. The formation of 3D spherical crystals has been mostly studied using slowly shrinking drops, which predominantly results in isotropic supraballs composed of repeated layers from the spherical surface toward the center, where each layer is composed of a hexagonal array of colloidal particles; [1,[9][10][11][12][13] here, we refer to the structure as an onion-like structure. However, as each layer has many dislocations identical to those for colloids confined to a 2D spherical surface, the supraball contains a high density of defects, which is expected to be energetically unfavorable. There has been few reports about the formation of single-crystal or multigrain structure occupying the entire spherical volume; [14][15][16][17] according to these reports, quantum-dot nanoparticles form fcc crystals during the shrinkage of droplets, which showed no photonic effect due to the small lattice dimension. Recently, it was reported that colloidal particles form icosahedron and its derivatives in very slowly shrinking droplets. These nanoparticles and colloids are assembled by entropy.In the current work, we studied the crystallization behavior of charged colloidal particles with repulsive interparticle potential confined in water-in-oil-in-water double-emulsion drops or microcapsules. The particles were initially in the fluid phase in the inner water drop, but eventually spontaneously formed colloidal crystals to reduce the repulsive energy. The crystallization started along the spherical interface of the inner drop as a result of heterogeneous nucleation. [18] In general, crystal growth behavior varies depending on the strength of repulsion at the average interparticle separation. [6,19] In the current work, strong repulsion between particles was shown to lead to fast growth of the crystals from the surface of the microcapsule, forming an isotropic onion-like structure. By contrast, weak repulsion led to slow growth and fusion of crystallites, eventually resulting in Colloidal particles with a repulsive interparticle potential spontaneously form crystalline lattices, which are used as a motif for photonic materials. It is difficult to predict the crystal arrangement in spherical volume as lattices are incompatible with a spherical surface. Here, the optimum arrangement of charged colloids is experimentally investigated by encapsulating them in double-emulsion drops. Under conditions of strong interparticle repulsion, the colloidal crystal rapidly grows from the surface toward the ce...

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Colloidal Crystal Beads as Supports for Biomolecular Screening

Cited by 20 publications

References 25 publications

Controlled Synthesis, Growth Mechanism, and Properties of Monodisperse CdS Colloidal Spheres

Controlled Synthesis, Growth Mechanism, and Properties of Monodisperse CdS Colloidal Spheres

Photonic Crystals for Chemical Sensing and Biosensing

Photonic Microcapsules Containing Single‐Crystal Colloidal Arrays with Optical Anisotropy

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