Loranger Eric, Piché André-Olivier, Daneault Claude
Lignocellulosic Material Research Centre, Université du Québec à Trois-Rivières, 3351 Des Forges, Trois-Rivières, Québec G9A 5H7, Canada.
Canada Research Chair in Value-added Paper, 3351 Des Forges, Trois-Rivières, Québec G9A 5H7, Canada.
Nanomaterials (Basel). 2012 Sep 10;2(3):286-297. doi: 10.3390/nano2030286.
Cellulose nanofibers can be produced using a combination of TEMPO, sodium bromide (NaBr) and sodium hypochlorite, and mechanical dispersion. Recently, this process has been the subject of intensive investigation. However, studies on the aspects of mechanical treatment of this process remain marginal. The main objective of this study is to evaluate the high shear dispersion parameters (e.g., consistency, stator-rotor gap, recirculation rate and pH) and determine their influences on nanocellulose production using ultrasound-assisted TEMPO-oxidation of Kraft pulp. All nanofiber gels produced in this study exhibited rheological behaviors known as shear thinning. From all the dispersion parameters, the following conditions were identified as optimal: 0.042 mm stator-rotor gap, 200 mL/min recycle rate, dispersion pH of 7 and a feed consistency of 2%. High quality cellulose gel could be produced under these conditions. This finding is surely of great interest for the pulp and paper industry.
纤维素纳米纤维可以通过TEMPO、溴化钠（NaBr）和次氯酸钠的组合以及机械分散来生产。最近，这个过程一直是深入研究的主题。然而，关于这个过程中机械处理方面的研究仍然很少。本研究的主要目的是评估高剪切分散参数（例如，浓度、定子-转子间隙、再循环速率和pH值），并确定它们对使用超声辅助TEMPO氧化硫酸盐浆生产纳米纤维素的影响。本研究中生产的所有纳米纤维凝胶都表现出称为剪切变稀的流变行为。从所有分散参数中，确定以下条件为最佳：定子-转子间隙0.042毫米，再循环速率200毫升/分钟，分散pH值7，进料浓度2%。在这些条件下可以生产出高质量的纤维素凝胶。这一发现对于制浆造纸工业肯定具有极大的意义。
