Continuous production of cellulose microbeads by rotary jet atomization
Continuous production of cellulose microbeads by rotary jet atomization
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DOI：
10.1016/j.jcis.2022.07.120
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发表时间：
2022-07-26
影响因子：
9.9
通讯作者：
Mattia，Davide
中科院分区：
文献类型：
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作者：
Callaghan，Ciaran;Scott，Janet L.;Mattia，Davide
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取代塑料微珠是必不可少的，假设纤维素微珠可以是这样的替代品，但其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薄，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来产生溶解在[EMIm][OAc]和DMSO溶液中的纤维素射流。射流经受瑞利破碎以产生液滴，液滴在乙醇抗溶剂浴中被捕获，引发相转化，并导致纤维素再生成珠粒。（例如喷嘴尺寸）和操作（例如旋转速度和压力）参数允许抑制卫星液滴产生和二次液滴破裂，以及调整细丝变细过程。这导致连续制造的纤维素微珠的尺寸范围为40-500 μm，具有窄的尺寸分布。这种方法可以生产现有技术无法达到的尺寸范围内的珠粒。
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.HypothesisCellulose 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.ExperimentsA 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.FindingsControl 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.