For this question, I want to have robots/androids with artificial muscles for motion. I know that there is a kind of silicon-ethanol muscle that works by thermal energy (the electricity boils the Ethanol, making the liquid to become gas, expand and simulate a contraction).
But nothing really useful for robots in general, nor close to Westworld silica-muscles
The only thing I can think of is dielectric muscles, but these need charges beyond 10kv to work.
Are there designs currently or in development that would be suitable as artificial muscles for a robot or android? The goal would be to achieve something similar to artificial muscles as shown in shows such as Westworld (but not looking for an explanation of Westworld; it's just an example), functioning as muscles not hydraulics, etc.
I can imagine that the answer is a hard one, but I want to know if there is something out there that gets close enough.