Design and evaluation of Artemia-driven micro ratchet gears
Design and evaluation of Artemia-driven micro ratchet gears
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卤虫驱动微型棘轮齿轮的设计与评估
DOI：
10.1016/j.sna.2015.10.011
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T.Nisisako and Y.Yanagida
中科院分区：
文献类型：
--
作者：
T.Hatsuzawa;A.Yamazaki;T.Nisisako and Y.Yanagida
本文介绍了artemia驱动的微型棘轮齿轮的设计和性能评价结果。实验中选用的是幼期盐虾，因为它们具有良好的趋光性，比成虾更容易在更短的时间内培养。虾在光作用下向齿轮表面迁移，齿轮表面的外围部分被光圈掩膜照射。由于轮廓不对称，碰撞对棘轮表面产生旋转力矩。齿轮由紫外线（UV）固化树脂使用3D打印机制造。实验确定了合适的齿轮半径（2.5 mm）和厚度（1.5 mm）。通过在齿轮表面涂漆来控制齿轮表面的亮度，从而有效地增强了齿轮表面的趋光性。考察了旋转速度与青蒿种群数和光照波长的关系。在蓝光照射下，种群密度为300个青蒿素（4ml）的培养基可获得最大速度（0.4 rpm）。在没有进料和介质交换的情况下，还评估了长期旋转，并在40 h时达到最大。由于小扭矩难以直接测量，因此采用阻力模型进行模拟。结果（0.24 μNm）与先前用adultArtemia测定的结果相当一致。
This paper describes the design and evaluation ofArtemia-driven micro ratchet gears and the results of performance evaluation. Larval-stageArtemia sallina(brine shrimp) were used in the experiments because they exhibit positive phototaxis and are more easily cultured within a shorter time than adults. The shrimp photactically migrated toward the gear surface, whose outskirts were partially illuminated by an aperture mask. Because the contour was asymmetric, the collision impacts on the ratchet surface generated a rotation torque. Gears were fabricated from an ultra-violet (UV) cured resin using a 3D printer. The appropriate gear radius (2.5 mm) and thickness (1.5 mm) were experimentally determined. Phototaxis was effectively enhanced by brightness control on the gear surface, achieved by painting the surface. The dependences of rotation speed on theArtemiapopulation number and illumination wavelength were examined. A population density of 300Artemiain 4 mL of culture medium under blue light illumination yielded the maximum speed (0.4 rpm). Long-term rotation without feeding and medium exchange was also evaluated and was maximized at 40 h. Because the small torque was difficult to be measured directly, it was simulated by a drag force model. The result (0.24 μNm) is reasonably consistent with previous measurements using adultArtemia.