羧基化纳米纤维素直接书写打印摩擦纳米发电机的研究

Research on the Direct Ink Writing of Triboelectric Nanogenerator with Carboxylated Cellulose Nanofibers

本研究利用氧化-高压均质法,以桉木漂白硫酸盐浆为原料,2,2,6,6-四甲基哌啶氧化物(TEMPO)作为催化剂,通过改变次氯酸钠(NaClO)添加量制备不同羧基含量的纳米纤维素(CNF)水凝胶,再添加羧甲基纤维素钠(CMC)制备出用于直接书写(DIW)打印正极摩擦层的墨水,研究了羧基含量对摩擦纳米发电机(TENG)正极摩擦层强度和电学性能的影响。结果表明,CNF的羧基含量随着NaClO添加量的增加而逐渐提高,当NaClO添加量为12mmol/g时,打印出的正摩擦层结构稳定,内部片层结构均匀,具有蜂窝状气孔,机械性能优异。与聚二甲基硅氧烷(PDMS)制备的负摩擦层组装的TENG,开路电压和短路电流分别达到了208V和33.7nA。

In this study,CNF hydrogels with different carboxyl content were prepared by changing the amount of NaClO using oxidation-high pressure homogenization method with eucalyptus bleached kraft pulp as raw material and TEMPO as catalyst.An ink for DIW positive friction layer was prepared by adding CMC.The influence of carboxyl content on the strength and power generation performance of the positive tribolayer of the TENG was studied.The results showed that the carboxyl content of CNF is increased with the increase of NaClO content,when the amount of NaClO is 12mmol/g,the printed positive friction material has stable structure,uniform internal lamellar structure and honeycomb-like pores,excellent mechanical properties.The open-circuit voltage and short-circuit current of the TENG assembled with PDMS negative friction layer were 208V and 33.7nA,respectively.