Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2022-07-22 , DOI: 10.1016/j.jcis.2022.07.120 Ciarán Callaghan 1 , Janet L Scott 2 , Karen J Edler 2 , Davide Mattia 1
|
The replacement of plastic microbeads with biodegradable alternatives is essential due to the environmental persistence of plastics and their accumulation within the human food chain.
Hypothesis
Cellulose microbeads could be such alternative, but their production is hindered by the high viscosity of cellulose solutions. It is expected that this viscosity can be harnessed to induce filament thinning of jets of cellulose solutions to create droplets with diameters within the micrometre range, which can then be converted to solid cellulose microbeads via phase inversion.
Experiments
A 3D printed rotating multi-nozzle system was used to generate jets of cellulose dissolved in solutions of [EMIm][OAc] and DMSO. The jets were subject to Rayleigh breakup to generate droplets which were captured in an ethanol anti-solvent bath, initiating phase-inversion, and resulting in regeneration of the cellulose into beads.
Findings
Control of both process (e.g. nozzle dimensions) and operational (e.g. rotational speed and pressure) parameters has allowed suppression of both satellite droplets generation and secondary droplet break-up, and tuning of the filament thinning process. This resulted in the continuous fabrication of cellulose microbeads in the size range 40–500 μm with narrow size distributions. This method can produce beads in size ranges not attainable by existing technologies.
中文翻译：
通过旋转喷射雾化连续生产纤维素微珠
由于塑料在环境中的持久性及其在人类食物链中的积累，用可生物降解的替代品代替塑料微珠至关重要。
假设
纤维素微珠可能是这样的替代品，但它们的生产受到纤维素溶液的高粘度的阻碍。预计可以利用这种粘度来诱导纤维素溶液射流的细丝变细，以产生直径在微米范围内的液滴，然后可以通过相转化将其转化为固体纤维素微珠。
实验
使用 3D 打印的旋转多喷嘴系统生成溶解在 [EMIm][OAc] 和 DMSO 溶液中的纤维素射流。射流经受瑞利分解以产生液滴，这些液滴被捕获在乙醇反溶剂浴中，引发相转化，并导致纤维素再生成珠子。
发现
对工艺（例如喷嘴尺寸）和操作（例如转速和压力）参数的控制已允许抑制卫星液滴的产生和二次液滴破碎，以及调整细丝变细工艺。这导致尺寸范围为 40-500 μm 且尺寸分布窄的纤维素微珠的连续制造。这种方法可以生产现有技术无法达到的尺寸范围的珠子。
京公网安备 11010802027423号