Polymer colloidal particles patterned substrate

More recently, DPN techniques have been extended and developed to pattern a variety of ink-substrate combinations. DPN has been shown to be compatible with a wide array of ink types including small organic molecules, organic and biological polymers, colloidal particles, metal... 

Ordered Array Structure of Polymer Colloidal Particles on a Patterned Substrate. 174... 

Figure 26 illustrates the set-up and schematic procedures of the tapered cell method [140, 141], where a cover glass was slightly tilted (angle = 1-2°) on the patterned Si substrate. An aqueous dispersion liquid of polymer colloidal particles... 

Adsorption of block copolymers onto a surface is another pathway for surface functionalization. Block copolymers in solution of selective solvent afford the possibility to both self-assemble and adsorb onto a surface. The adsorption behavior is governed mostly by the interaction between the polymers and the solvent, but also by the size and the conformation of the polymer chains and by the interfacial contact energy of the polymer chains with the substrate [115-119], Indeed, in a selective solvent, one of the blocks is in a good solvent it swells and does not adsorb to the surface while the other block, which is in a poor solvent, will adsorb strongly to the surface to minimize its contact with the solvent. There have been a considerable number of studies dedicated to the adsorption of block copolymers to flat or curved surfaces, including adsorption of poly(/cr/-butylstyrcnc)-ft/od -sodium poly(styrenesulfonate) onto silica surfaces [120], polystyrene-Woc -poly(acrylic acid) onto weak polyelectrolyte multilayer surfaces [121], polyethylene-Wocfc-poly(ethylene oxide) on alkanethiol-patterned gold surfaces [122], or poly(ethylene oxide)-Woc -poly(lactide) onto colloidal polystyrene particles [123],... 

The assembly of the colloidal particles on the patterned silane layers was achieved through adsorption from a droplet of latex suspension deposited onto the horizontal substrate (drop coating method). For the interaction of the particles with the silane surface several scenarios have to be considered. The PBA particles are composed of an intrinsically hydrophobic polymer, but they... 

Two examples of selective metal deposition follow. Parallel cylindrical PS-b-PMMA is treated with a palladium colloid, which selectively deposits on top of the polystyrene domains.Electroless deposition of nickel then forms on the palladium particles. Alternatively, PS-b-P4VP with cylindrical P4VP aligned parallel to the substrate is soaked in a weakly acidic aqueous solution of metal salts such as gold chloride, sodium tetrachloroplatinate, and sodium tetrachloropalla-date. ° ° A plasma etch removes the polymer film and reduces the metal patterned in the P4VP domains. 

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