Colloidal Chain Pulled from Dispersion (IMAGE) Northwestern University Caption Particles are pulled out of a dispersion to form a 'pearl necklace', by applying an electric field through a needle-shaped electrode. Credit Ming Han Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.