Hippocampal neurons on a radial wettability gradient (left) and profile of the wettability gradient (right). Hippocampal neurons were cultures on wettability gradients prepared by plasma deposition of hexane through a pinhole mask. The gradient was analysed by water contact angle (WCA) measurements. The number of neurons adhering to the surface decreased towards the centre of the gradient, where the surface became more hydrophobic.
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