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Nanomaterial deposition system that contains two modules: An electrospray ionization module (left) and a nanoparticle assembly module (right). An aerosol of charged nanomaterials is form as a result of the electrospraying process. The highly charged aerosol becomes partially neutralized by the alpha source. The aerosol flows into the nanomaterial assembly module. A global field is applied to bring nanomaterials of desired polarity into close proximity of the surface. A surface charge pattern is used to deposit the nanomaterials on desired areas on the substrate.
Scanning electron microscopy image of protein-coated gold colloids assembled in wide lines by electrospray ionization and Coulomb force directed assembly.
Representative fluorescent optical microscope images of printed proteins—albumin FITC bovine (green) and avidin sulforhodamine (red). (A and B) show and wide parallel lines, respectively. (C) A square pattern with line widths. (D and E) The sequential assembly of the two proteins into separate line patterns on the same chip as directed by the global and local fields: Negatively charged avidin (D) that assembled onto the wide positive charge pattern and positively charged albumin bovine (E) that deposited in between the charged lines. (F) An overlay of (D) and (E).
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