Brownian motion moving nano/micro coils inside a magnetic field Following experimental setup.
We take copper coils which are small enough to be subject to brownian motion. We combine those coils with some other material to make them about as heavy as the liquid we submerge them in (same weight per volume) so they would neither all gather up at the top nor bottom of the liquid but rather spread out evenly.
Through permanent magnets we create a static magnetic field within the vicinity of the liquid.
When the coils are moved around randomly through brownian motion inside the liquid, wouldn't this induce some current? 
Wouldn't this basically resemble a magnetic brake which would result in cooling down the liquid?
A refrigerator working without any outside source, other than the energy of particles moving around randomly and pushing the coils around randomly? 
As a bonus, one could possibly imagine to use the current the coils are subject to when moving through the magnetic field in a way which would have them emit some electromagnetic waves in the spectrum of visible light. Possibly allowing us to see a glow in a dark room.
Since this would most likely violate the second law of Thermodynamics, and we cannot have that, my question is, what part of this experiment would not work as i imagine it?
Note that this experiment was proposed the other way around, where we would rather use nano magnets being moved through brownian motion, but those would clump together into a bigger magnet, so i was just thinking that instead of moving magnets, one could just move coils through a magnetic field if coils that small in the nano/micro size range could actually be built.
 A: 
When the coils are moved around randomly through brownian motion inside the liquid, wouldn't this induce some current?

Yes.

Wouldn't this basically resemble a magnetic brake

Accounting for the fact that copper has a nonzero resistance, then the thermal energy of the water causes the coils to move, this causes induced current, and this current is dissipated as heat in the coils (see Joule heating).
In other words, thermal energy of the liquid turns into heat in the copper coils.
So yes, there is a braking action going on, but...

which would result in cooling down the liquid?

No.
The heat flow goes in both directions, from water to coil and from coil to water.
As the coil gets hot it's still in contact with the water, so of course if the temperature of the copper fluctuates above that of the water, then we get net heat flow from copper to water, thus keeping everything in equilibrium.
In fact, even if you imagine thermally insulated wires which cannot conduct heat to the water, you still don't get cooling of the water.
To dissipate the electrical energy as heat, the coils need some resistance.
It turns out that resistors at any nonzero temperature make electrical noise.
This electrical noise would cause the coils to jitter around, thus stirring up the water and heating it until the coils and water are all at the same temperature.

A refrigerator working without any outside source, other than the energy of particles moving around randomly and pushing the coils around randomly?

No.
See previous point.

As a bonus, one could possibly imagine to use the current the coils are subject to when moving through the magnetic field in a way which would have them emit some electromagnetic waves in the spectrum of visible light. Possibly allowing us to see a glow in a dark room.

Sure, we could rig something so that the induced currents cause radiation, but that doesn't change anything.
If the surrounding environment were colder than the water and coils, then the radiation would go out and warm up those surroundings.
Meanwhile, the surroundings emit radiation of their own because they're at a nonzero temperature, and again once everything's at the same temperature the power flows between all the elements are exactly balanced.
So, while the coils may "glow", the surroundings also "glow" right back at the coils and you still don't have a magic refrigerator.

Since this would most likely violate the second law of Thermodynamics, and we cannot have that, my question is, what part of this experiment would not work as I imagine it?

Well to review:


*

*Materials with resistance create electrical noise, so the coils warm up the water just as the water warms up the coils.

*Even background radiation has a temperature and if you wait for a while everything which can radiate at each other winds up with the same temperature.
A: The state of the nano-circuits can be classified as one of the following three:

State A outputs large amounts of energy but is a low entropy state and therefore (due to the free energy being $F=U-TS$) will never arise.
State B consists of high orientational disorder which will generate light (or some other energy output). Due to the high entropy, this will be the favoured configuration at elevated temperatures. You correctly suggest that the energy will be extracted from the kinetic energy of the water, causing the temperature to decrease.
As the temperature decreases, the water will jiggle less, reducing the energy yield of the nano-circuits. As the temperature decreases more and more, one of two things could happen. The nano-circuits may retain their high entropy state, but the lack of brownian motion eliminates the energy output. Or (in an ideal case) the nano-circuits will align in a low-energy state (C).
