16 February 2010 Dynamics of percolation phenomena in colloidal printing inks
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The conductivity of colloidal inks composed of poly(ethylene glycol) (PEG), 2-(4-tert-Butylphenyl)-5-(4-biphenylyl)- 1,3,4-oxadiazole (tPBD) or polystyrene-tPBD copolymerized colloids (PS-PBD) and carbon black (CB) were investigated to establish their percolation characteristics. The PS-PBD colloid supported inks (PEG/PS-PBD/CB) exhibited reduced percolation thresholds and enhanced conductivities above that of the individually carbon filled (PEG/CB) and small molecule blend (PEG/tPBD/CB) inks. Based on the DC conductivity analysis, the percolation threshold of the PEG/PS-PBD/CB composites was 3.6 vol%. The electrical resistivity of the PEG/PS-PBD/CB ink is lower than that of PEG/PBD/CB ink with the same CB content in the percolation region by 8 orders of magnitude. The percolation reduction was attributed to the heterogeneous dispersion of conductive filler aggregates "bridged" by PSPBD colloids. The aggregated dispersion of PS-PBD colloids in the ink matrix was characterized by photoluminescence spectroscopy (PL) which produced a red-shift at high concentrations, signaling the required proximity of PS-PBD colloids to form energy transfer complexes.
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Michael Angelo-Anthony Daniele, Michael Angelo-Anthony Daniele, Alexandra L. Foguth, Alexandra L. Foguth, Parul Rungta, Parul Rungta, Iurii Bandera, Iurii Bandera, Volodymyr Tsyalkovskyy, Volodymyr Tsyalkovskyy, Stephen H. Foulger, Stephen H. Foulger, } "Dynamics of percolation phenomena in colloidal printing inks", Proc. SPIE 7591, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics III, 759111 (16 February 2010); doi: 10.1117/12.842647; https://doi.org/10.1117/12.842647

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