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Evidence for nanocoulomb charges on spider ballooning silk.
Physical Review E ( IF 2.2 ) Pub Date : 2020-07-09 , DOI: 10.1103/physreve.102.012403 E L Morley 1 , P W Gorham 2
Physical Review E ( IF 2.2 ) Pub Date : 2020-07-09 , DOI: 10.1103/physreve.102.012403 E L Morley 1 , P W Gorham 2
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We report on three launches of ballooning Erigone spiders observed in a laboratory chamber, controlled under conditions where no significant air motion was possible. These launches were elicited by vertical, downward-oriented electric fields within the chamber, and the motions indicate clearly that negative electric charge on the ballooning silk, subject to the Coulomb force, produced the lift observed in each launch. We estimate the total charge required under plausible assumptions, and find that at least 1.15 nC is necessary in each case. The charge is likely to be nonuniformly distributed, favoring initial longitudinal mobility of electrons along the fresh silk during extrusion. These results demonstrate that spiders are able to utilize charge on their silk to attain electrostatic flight even in the absence of any aerodynamic lift.
中文翻译：
蜘蛛膨胀的丝上纳米库仑电荷的证据。
我们报告了在一次观测中观察到的三只气球膨胀的Erigone蜘蛛的发射实验室室，控制在不可能进行大量空气运动的条件下。这些发射是由室内垂直向下的电场引起的，运动清楚地表明，受到库仑力作用的气球丝上的负电荷会产生每次发射所观察到的升力。我们根据合理的假设估算所需的总电荷，并发现每种情况下至少需要1.15 nC。电荷很可能分布不均匀，这有利于电子在挤出过程中沿着新鲜丝线的初始纵向迁移率。这些结果表明，即使没有任何气动升力，蜘蛛也能够利用其丝绸上的电荷实现静电飞行。
更新日期：2020-07-09
中文翻译：
蜘蛛膨胀的丝上纳米库仑电荷的证据。
我们报告了在一次观测中观察到的三只气球膨胀的Erigone蜘蛛的发射实验室室，控制在不可能进行大量空气运动的条件下。这些发射是由室内垂直向下的电场引起的，运动清楚地表明，受到库仑力作用的气球丝上的负电荷会产生每次发射所观察到的升力。我们根据合理的假设估算所需的总电荷，并发现每种情况下至少需要1.15 nC。电荷很可能分布不均匀，这有利于电子在挤出过程中沿着新鲜丝线的初始纵向迁移率。这些结果表明，即使没有任何气动升力，蜘蛛也能够利用其丝绸上的电荷实现静电飞行。
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