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1. Micro-buckling of paper during blade metering

Author

Alam, Parvez and Toivakka, Martti

Subjects
*BEARINGS (Machinery), *METERING pumps, *NUCLEAR reactor buckling, *CHEMICAL engineering, *ELASTIC analysis (Engineering), *PHYSICS research
Abstract

Multiphysics models were used to simulate the deformational characteristics experienced by paper under metering blades. Paper is found to slip microscopically at the backing roll interface and subsequently buckle either side of the blade during metering operations. Micro-slippage of the paper at the interface is a linear function of the separation height incurred during buckling. The effects of altering the static coefficient of friction as well as the properties of the backing roll material are studied. Increasing the coefficient of static friction reduces the extent of buckling while a non-linear relationship is found to arise on increasing the elastic modulus of the backing roll material. The mechanisms involved in micro-buckling deformation are explicated herein. [Copyright &y& Elsevier]

Published
2008
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2. Paper supports in electrocatalysis: Weak contact catalysis with seed-mediated grown gold nanoparticle deposits

Author

Charles Y. Cummings, Munetaka Oyama, Daisuke Nakashima, and Frank Marken

Subjects
Paper, Electron-transfer reactions, Textile, Catalyst support, Nanoparticle, Nanotechnology, Contact-electrocatalysis, Electrocatalyst, Electrochemistry, Catalysis, lcsh:Chemistry, Gold nanoparticles, Voltammetry, Chemistry, Impedance, Seed-mediated growth method, Modified electrodes, Chemical engineering, lcsh:Industrial electrochemistry, lcsh:QD1-999, Colloidal gold, Electrode, lcsh:TP250-261
Abstract

Paper surfaces (Whatman filter papers, Kimwipes®, and Japanese Washi papers) were employed as support for gold nanoparticles (AuNPs) deposited by the seed-mediated growth method. The AuNP-modified paper or textile was brought into “weak” (or non-permanent) contact with a glassy carbon electrode and immersed into aqueous electrolyte media. Electrochemical responses for the Fe(CN)64−/Fe(CN)63− redox system in 0.1 M phosphate buffer (pH 7.0) and 1.0 M KCl solutions were investigated by voltammetry and impedance methods. Even for weakly contacted AuNP catalysts of relatively low density faster electron transfer was observed. Particle sizes of at least 20 nm diameter were required. There was no permanent contact from AuNP catalysts to the electrode and the process was therefore termed “weak contact catalysis”. The method is proposed as a rapid and novel catalyst screening tool with potential applications in fuel cell and sensor technologies. Keywords: Modified electrodes, Gold nanoparticles, Electron-transfer reactions, Textile, Paper, Catalyst support, Seed-mediated growth method, Voltammetry, Impedance, Contact-electrocatalysis

Published
2011