So variable charge surface is not a constant potential surface.

所以，可变电荷表面并非恒电位表面。

youdao

In the studied samples, iron and aluminium oxide were pH-dependent positive charge surface, silica was pH-dependent negative charge surface.

在所研究的样本中，氧化铁和氧化铝是带可变正电荷的亚表面，而氧化硅是带可变负电荷的亚表面。

youdao

Moreover, the surface charge density of lipidic nanostructures can be varied in a simple manner.

更重要的是，其表面电荷密度可以通过简单方式改变。

youdao

The controller allows a Qi-compliant smartphone or other portable device to charge in a surface area of at least 70 mm by 20 mm, 400-percent larger compared to today's 18-mm by 18-mm "bull's-eye" charge space.

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This microscopic scale and sensitivity allows the sensor to map a high-resolution image of electrical charge that occurs over the surface of a source material (for example a human finger), when it makes contact with a thin insulating surface (ie a plastic surface).

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This massively increases their surface area and hence the charge they can hold, but without impairing the physical strength of the material.

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