Patterned Colloid Assembly by Grafted Photochromic Polymer Layers

Piech, Martin; George, M. C.; Bell, Nelson S.; Braun, Paul V.

doi:10.1021/la051636c

Cited by 49 publications

(49 citation statements)

References 43 publications

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“…One chemical approach was based on derivatizing both a substrate and colloidal silica particles with a photosensitive polymer containing spirobenzopyran photochromic molecules. [72] Exposure to l = 366 nm light, induced ring-opening of the spirobenzopyran to the zwitterionic merocyanine form, whereas exposure to l = 585 nm light reversed this process. Using these light-driven conversions, chemically distinct patterns with different polarity were generated by light exposure.…”

Section: Guiding Particle Assembly By External Fields 371 Lightmentioning

confidence: 99%

Colloidal Assembly: The Road from Particles to Colloidal Molecules and Crystals

2010

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Colloidal particles may be considered as building blocks for materials, just like atoms are the bricks of molecules, macromolecules, and crystals. Periodic arrays of colloids (colloidal crystals) have attracted much interest over the last two decades, largely because of their unique photonic properties. The archetype opal structures are based on close-packed arrays of spheres of submicrometer diameter. Interest in structuring materials at this length scale, but with more complex features and ideally by self-assembly processes, has led to much progress in controlling features of both building blocks and assemblies. The necessary ingredients include colloids, colloidal clusters, and colloidal "molecules" which have special shapes and the ability to bind directionally, the control over short-range and long-range interactions, and the capability to place and orientate these bricks. This Review highlights recent experimental and theoretical progress in the assembly of colloids larger than 50 nm.

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Section: Guiding Particle Assembly By External Fields 371 Lightmentioning

confidence: 99%

Colloidal Assembly: The Road from Particles to Colloidal Molecules and Crystals

2010

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“…One rapid and controllable way of making linear and multidimensional structures is the “directed” colloidal assembly, which can be achieved by internal fields (induced by surfactants10 and by dynamic self-assembly11) or by applying an external field (e.g., magnetic12, or electric13, or light14). AC-field driven DEP induces a long-range dipolar interaction between randomly distributed particles13141516, which forces them to align into long chains along the direction of the applied field17. This effect has been used for one-dimensional18 and two-dimensional19 assembly, as well as for particle (or cell) capturing20.…”

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confidence: 99%

Co-Assembly of Oppositely Charged Particles into Linear Clusters and Chains of Controllable Length

Bharti

Findenegg

Velev

2012

Sci Rep

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Colloidal particles with strongly attractive interactions snap on contact and form permanent, but disordered aggregates. In contrast, AC electric fields allow directional assembly of chains or crystals from repulsive particles by dielectrophoresis (DEP), but these structures fall apart once the field is switched off. We demonstrate how well-organized, permanent clusters and chains of micron-sized particles can be assembled by applying DEP to mixtures of oppositely charged microspheres. We found that the length of the formed chains depends on size ratio as well as the number ratio of the two species, and formulated a statistical model for this assembly mechanism, which is in excellent agreement with the experimental results. The assembly rules resulting from this study form a basis for tailoring new classes of permanent supracolloidal clusters and gels.

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“…Two dimensional-patterned colloid assemblies were obtained via the appropriate modification of a flat substrate with a PSP- co -PMMA polymer film which was next immersed in a stable colloidal dispersion of the photo-responsive hybrids. Upon UV irradiation, the MC moieties formed on the flat surface due to the SP photo-isomerization, aggregate with the SP moieties of the polymer brushes of the colloidal hybrids and hold the two surfaces together [102]. Analogous three-dimensional porous structures have been fabricated by direct laser writing of a dense colloidal suspension of the photo-responsive spheres.…”

Section: Resultsmentioning

confidence: 99%

End-Grafted Polymer Chains onto Inorganic Nano-Objects

Achilleos

Vamvakaki

2010

Materials

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Organic/inorganic nanohybrid materials have attracted particular scientific and technological interest because they combine the properties of the organic and the inorganic component. Inorganic nanoparticles exhibit interesting electrical, optical, magnetic and/or catalytic properties, which are related with their nano-scale dimensions. However, their high surface-to-volume ratio often induces agglomeration and leads to the loss of their attractive properties. Surface modification of the inorganic nano-objects with physically or chemically end-tethered polymer chains has been employed to overcome this problem. Covalent tethered polymer chains are realized by three different approaches: the “grafting to”, the “grafting from” and the “grafting through” method. This article reviews the synthesis of end-grafted polymer chains onto inorganic nanoparticles using “controlled/living” polymerization techniques, which allow control over the polymer characteristics and the grafting density of the end-tethered polymer chains.

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Patterned Colloid Assembly by Grafted Photochromic Polymer Layers

Cited by 49 publications

References 43 publications

Colloidal Assembly: The Road from Particles to Colloidal Molecules and Crystals

Colloidal Assembly: The Road from Particles to Colloidal Molecules and Crystals

Co-Assembly of Oppositely Charged Particles into Linear Clusters and Chains of Controllable Length

End-Grafted Polymer Chains onto Inorganic Nano-Objects

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