Preparation of colloidal crystals with polyhedral building blocks through post-polymerization

Zeng, Fang; Wu, Shuizhu; Tang, Tian; Sun, Zhaohua; Wang, Chaoyang; Liu, Xinxing; Tong, Zhen

doi:10.1007/s00396-003-0993-z

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…By ion irradiation, thin 3D spherical CCs have been deformed into spheroidal oblates, but this method may be not suitable for thick CCs and the costs are relatively high. Other approaches are based on inducing some materials into the voids of colloidal crystals as the framework to deform colloids and then produce a nonspherical system, − whereas the indraft and removal of the assistant structures would increase the complexity of these methods.…”

Section: Introductionmentioning

confidence: 99%

Nonspherical Colloidal Crystals Fabricated by the Thermal Pressing of Colloidal Crystal Chips

Chen

et al. 2005

Langmuir

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Nonspherical colloids and their ordered arrays may be more attractive in applications such as photonic crystals than their spherical counterparts because of their lower symmetries, although such structures are difficult to achieve. In this letter, we describe the fabrication and characterization of colloidal crystals constructed from nonspherical polyhedrons. We fabricated such nonspherical colloidal crystals by pressing spherical polymer colloidal crystal chips at a temperature slightly lower than the glass-transition temperature (T(g)) of these polymer colloids. During this process, the polymer microspheres were distinctively transformed into polyhedrons according to their crystal structures, whereas the long-range order of the 3D lattice was essentially preserved. Because a working temperature lower than T(g) effectively prevented the colloidal crystals from fusing into films, the spherical colloidal crystals were transformed greatly under pressure, which lead to obvious change in the optical properties of colloidal crystals. Besides their special symmetry and optical properties, these nonspherical colloidal crystals can be used as templates for 2D or 3D structures of special symmetry, such as 2D nano-networks. We anticipate that this fabrication technique for nonspherical colloidal crystals can also be extended to nonspherical porous materials.

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Section: Introductionmentioning

confidence: 99%

Nonspherical Colloidal Crystals Fabricated by the Thermal Pressing of Colloidal Crystal Chips

Chen

et al. 2005

Langmuir

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“…Colloidal crystals present arrays of particles which are ordered over a wide range in length. Under appropriate conditions, colloidal particles can spontaneously selfassemble into crystals which are kept together by van der Waals interactions [3][4][5]. One can also prepare colloidal crystals layer-by-layer on planar surfaces [6].…”

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confidence: 99%

Templated assembly of polymer particles into mesoscopic clusters with well-defined configurations

et al. 2010

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We report on the fabrication of colloidal clusters through the combination of spherical particles. Polystyrene latex particles bearing amino groups on their surface were used as building blocks of the clusters. Packing of these particles with diameters of 91 and 154 nm into assemblies with defined configurations was accomplished using narrow dispersed emulsion droplets as templates. The building blocks of the clusters adhered to the oil-water interphase due to the Pickering effect. Subsequent evaporation of the dispersed phase forced them to pack into small clusters. Addition of the particles via the dispersed phase led to higher yields of clusters than if the building blocks were added via the continuous phase. All clusters had well-defined configurations. Because the dimensions of these clusters were below 400 nm, the colloidal assemblies underlay Brownian motion which resulted in stable suspensions. The number and yields of different species could be controlled via the concentration of the building blocks and surfactant within the emulsions. Moreover, the nature of the dispersed phase itself had a strong impact on the cluster formation. When cyclohexane was used as the dispersed phase, predominately particle doublets and triplets were obtained. The use of toluene-in-water emulsions resulted into a broader spectrum of clusters of up to 12 constituents. Such clusters could satisfy the demand for particles with complex but defined shapes and special symmetries for the fabrication of novel hierarchically organized materials.

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“…Firstly, monodispersed polystyrene colloidal particles are synthesized by emulsifier-free-emulsion copolymerization. 20) Secondly, by the capillary-enhanced method, 7) polystyrene colloidal particles self-assemble and form colloidal crystals onto the ITO-PET substrate, as shown in the inset of Fig. 7.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Flexible Thin Film with Pattern Structure and Macroporous Array Consisting of Nanoparticles by Electrophoretic Deposition

Chung

Fang

Lee

et al. 2010

Jpn. J. Appl. Phys.

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The electrophoretic deposition (EPD) possessing a low working temperature is used to fabricate functional thin films with microstructures onto a flexible substrate. We easily fabricate a flexible thin film in A4 size consisting of TiO2 nanoparticles onto an indium–tin-oxide/poly(ethylene terephthalate) (ITO/PET). The nanoparticle behavior during the EPD process is described and discussed according to different deposition time. The functional thin film can be applied as a flexible electrode layer of electrochromic displays and dye-sensitized solar cells. Furthermore, owing to the controllable deposition region of EPD, a pattern layer consisting of CdSe nanoparticles can be formed onto the flexible substrate within 1 min by EPD. Finally, by colloidal-template-mediated EPD, a nanostructure of a macroporous array onto flexible substrate can also be obtained. The result shows that the fabrication of nanostructures onto a flexible substrate is easy by EPD.

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Preparation of colloidal crystals with polyhedral building blocks through post-polymerization

Cited by 5 publications

References 16 publications

Nonspherical Colloidal Crystals Fabricated by the Thermal Pressing of Colloidal Crystal Chips

Nonspherical Colloidal Crystals Fabricated by the Thermal Pressing of Colloidal Crystal Chips

Templated assembly of polymer particles into mesoscopic clusters with well-defined configurations

Fabrication of Flexible Thin Film with Pattern Structure and Macroporous Array Consisting of Nanoparticles by Electrophoretic Deposition

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