(269g) Electro-Kinetics on Paper-Pencil Device Under High Electric Field

Paper based electro-kinetics is a new approach to drive the fluids through it at faster rates as comparison to low flow rates observed via capillary action mechanism due to pores present in the fibres. In the present study we studied electro-kinetically driven fluid movement on a paper-pencil based microchannel under high electric field (0-10 kV). Since electrophoresis under high voltage range is a new research endeavour to separate nanoparticles, drug molecules and biomolecules, patterning of liquid films, to name a few. Herein, we studied capillary driven movement of nanoparticles on a paper-pencil device fabricated by CO2 laser engraving method.The Hb pencil has been used to mark the electrodes at the paper substrate. Further more Rhodamine dye molecules movement through the paper in high voltage range is observed as well.In addition we have also demonstrated the movement of gold nanoparticle based sensor for arsenic detection. The proposed method enables us to not only detect the arsenic on paper based chips but to remove the arsenic from the system very fast and easily. In this method citrate stabilized gold nanoparticles were prepared using HAuCl₄ as precursor gold salts. Ruby red colored gold nanoparticles were further modified with thioctic acid which can be used to detect arsenic ion present in various samples by the change of color from red to blue.