Electrically conductive smart papers
AssigneeUniversity of Washington
InventorsAnthony B. Dichiara, Sheila M. Goodman
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Abstract
The present disclosure describes a method for preparing a paper nanocomposite, including: continuously providing a first suspension that includes lignocellulosic pulp fibers, cellulose nanofibrils, carbon nanotubes, and a cationic surfactant; continuously adding a second suspension to the first suspension to provide a slurry, the second suspension includes lignocellulosic pulp fibers, cellulose nanofibrils, carbon nanotubes, and an anionic surfactant; depositing the slurry comprising the first and second suspensions onto the substrate; and dewatering the slurry to form the paper nanocomposite.
Claims18
A method for preparing a paper nanocomposite by continuous flow processing, the method comprising:
- continuously providing a first liquid suspension comprising a first plurality of lignocellulosic pulp fibers, a first plurality of cellulose nanofibrils, a first plurality of carbon nanotubes, and a cationic surfactant, wherein the first plurality of carbon nanotubes have a positive charge, and wherein the first plurality of carbon nanotubes are adsorbed to the first plurality lignocellulosic pulp fibers via the first plurality of cellulose nanofibrils to form a first cellulosic unit;
- continuously adding a second liquid suspension to the first liquid suspension to provide a slurry, the second liquid suspension comprising a second plurality of lignocellulosic pulp fibers, a second plurality of cellulose nanofibrils, a second plurality of carbon nanotubes, and an anionic surfactant, wherein the second plurality of carbon nanotubes have a negative charge, and wherein the second plurality of carbon nanotubes are adsorbed to the second plurality lignocellulosic pulp fibers via the second plurality of cellulose nanofibrils to form a second cellulosic unit;
- filtering the slurry comprising the first and second liquid suspensions on a membrane to provide a filtered mat, wherein the filtered mat is an anisotropic sheet comprising alternating layers of the first cellulosic unit and the second cellulosic unit;
- and
- removing the liquid from the filtered mat to form the paper nanocomposite.
A paper nanocomposite, comprising lignocellulosic pulp fibers, cellulose nanofibrils, carbon nanotubes, an anionic surfactant, and a cationic surfactant, wherein the paper nanocomposite is an anisotropic sheet comprising alternating layers of a first cellulosic unit and a second cellulosic unit, wherein the first cellulosic unit comprises a first plurality of positively charged carbon nanotubes adsorbed to a first plurality of lignocellulosic pulp fibers via a first plurality of cellulose nanofibrils, and wherein the second cellulosic unit comprises a second plurality of negatively carbon nanotubes adsorbed to the second plurality of lignocellulosic pulp fibers via a second plurality of cellulose nanofibrils.
Dependencies are inferred from the claim text.