Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada CICATA, Unidad Altamira, Carretera Tampico-Puerto Industrial, km 14.5, Altamira, Tamaulipas, Mexico.
Instituto Politécnico Nacional, UPIIH, Ciudad del conocimiento y la cultura. Carretera Pachuca-Actopan km. 1+500 San Agustin Tlaxiaca, Hidalgo, Mexico.
Carbohydr Polym. 2020 Jun 15;238:116171. doi: 10.1016/j.carbpol.2020.116171. Epub 2020 Mar 13.
Cellulose nanocrystals (CNCs) were isolated from two-agroindustrial wastes: sugarcane bagasse (SCB) and pinewood sawdust (PWS), to analyze their chemical, structural, morphological, and proton conduction properties in dependence of the synthesis parameters. In both sources, the isolated CNCs correspond to the monoclinic phase of cellulose type I and II. For SCB, the smallest CNCs were isolated, in a range of 3-10 nm, with 5 wt.% of NaOH and 60 °C of acid hydrolysis. PWS displayed the smallest sizes at 75 °C and 10 wt.% NaOH (40-110 nm). Membrane characterization suggests that isolated CNCs, between 75 and 90 °C of acid hydrolysis and 10 wt.% NaOH from both SCB and PWS sources, displayed an important increase in the proton conductivity, 1.23(±0.61)×10 and 9.26 (±0.24)×10 S-m, respectively. Thus, with proper synthesis conditions, CNCs can be potentially used as based element to obtain other proton conductor materials to fabricate PEMs.
从两种农业工业废物（甘蔗渣（SCB）和松木木屑（PWS））中分离出纤维素纳米晶体（CNCs），以分析其化学，结构，形态和质子传导性能，这些性能取决于合成参数。在这两种来源中，分离出的 CNCs 都对应于纤维素 I 型和 II 型的单斜相。对于 SCB，用 5wt％的 NaOH 和 60°C 的酸水解，分离出的 CNCs 的尺寸最小，在 3-10nm 范围内。对于 PWS，在 75°C 和 10wt％NaOH 条件下（40-110nm），其尺寸最小。膜特性表明，在 75-90°C 的酸水解和 10wt％NaOH 条件下，来自 SCB 和 PWS 两种来源的 CNCs 的质子电导率分别显著增加到 1.23(±0.61)×10 和 9.26 (±0.24)×10 S-m。因此，通过适当的合成条件，CNCs 可以作为基础元素，获得其他质子导体材料，用于制备质子交换膜。
