| CPC G01N 27/30 (2013.01) [G01N 33/48714 (2013.01)] | 7 Claims |
|
1. A method of preparing a wood-derived ionic conductive cellulose-Cu(II) film (WICC-Cu(II) film), wherein the WICC-Cu(II) film has a transmittance over 87% despite the introduction of Cu2+, wherein the method comprises:
(1) preparing softwood pulp suspension in a concentration of 0.08 g/mL, (2,2,6,6-tetramethylpiperidin-1-yl)-oxidanyl homogeneous solution in a concentration of 1 g/mL (TEMPO homogeneous solution), sodium bromide homogeneous solution in a concentration of 0.01 g/mL (NaBr homogeneous solution) and copper nitrate trihydrate solution in a concentration of 100 mM (Cu(NO3)2 solution);
(2) mixing the NaBr homogeneous solution with the TEMPO homogeneous solution to prepare NaBr/TEMPO blended solution, then adding the NaBr/TEMPO blended solution and sodium hypochlorite solution (NaClO solution), into the softwood pulp suspension to prepare a blended suspension;
(3) maintaining the blended suspension at pH 8.8-10.5 for 3-5 hours to obtain a purified cellulose suspension, following by washing and diluting the purified cellulose suspension, which is then dispersed into nanofiber to obtain nanocellulose suspension;
(4) separating the nanofiber and the microfiber and collecting the supernatant to obtain a wood-derived ionic conductive cellulose homogeneous solution (WICC homogeneous solution);
(5) evenly mixing the WICC homogeneous solution with the Cu(NO3)2 solution and deionized water and then drop-coating the obtained solution onto a substrate whose surface is treated with plasma pretreatment and exposing the substrate at room temperature to cure the WICC-Cu(II) film for 10-13 hours, wherein the Cu2+ concentration in the obtained solution is adjusted to about 0.5 mM.
|