Maybe we have the longest title, I'm not sure.

But I want to emphasize that this is a joint effort actually.

So I will give one part of the presentation from FAU and then there will be David from

BAM presenting another part.

So we'll have a tandem presentation.

And I hope you could all enjoy your lunch and you are strengthened for this next session.

All right.

So we will talk about multi-wavelength AEC again.

But we will not talk about multi-wavelength absorbance, but fluorescence.

So just a little bit of motivation.

So this whole project is included in a larger research project in our university where we

aim for the targeted synthesis of particles.

And we want to do this by a knowledge driven approach and by a design approach.

That means we don't just do a synthesis of our particles and then they have certain properties

and they define the product properties.

But we want to inverse this whole process chain.

So we want to define our desired product properties, then define what are the dispersed properties

we need, so size, density, shape, extinction and emission properties.

And then we want to see which synthesis conditions do we actually need in order to make these

particles.

Okay.

In order to do this, we need to have strong and sophisticated characterization techniques.

And this is where our toolbox comes in.

So we will have, we will use our different technologies.

So we have our multi-wavelength extinction or absorbance detector.

We have the multi-wavelength emission and this is what I will focus on today.

We also have an Optima.

We have several LumiSizers and they provide us in the end with information on our sedimentation

properties.

And from that we can get our property distributions.

And we can also get our spectral information.

Okay.

So what we did in the last years, we developed a multi-wavelength emission setup.

So the idea here is that we have a lot of systems which show size and shape and composition

dependent emission properties.

And these we wanted to resolve with our AUC technologies.

And there is nothing available on the market.

So we built our own system.

And here it's shown how it looks like in reality.

This is a sketch of the whole setup.

The idea basically is that you have a fixed excitation and that can be different wavelengths.

So you can select from different wavelengths.

We have either 405 nanometers at the moment or 530.

But we also have three other laser wavelengths which you can choose from.

We just have to change the coupling then.

Everything is positioned outside the chamber.

So the laser and the detector is outside and everything else inside is done with fibers.

And in the last two or three years we did some modifications in the set direction in

order to account for the change in the set position when applying the vacuum.

And this gives us much better data now which we published also recently here in this paper.