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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