 It's a work that allows a bigger project. But we're going to present some results that we get so far. So what is the beginning of everything? We want to build a kind of device that we can harvest light and convert into electricity in the charge carrier. And for that, we built like two interfaces making with bubble, soap bubble. And then we dug this interface with a photosynthesizer. In between of the, I don't know if you can see my pointer. But in the middle, you have like a water interface. In the middle of the two bubble, you have a water interface in the surface of the photosynthesizer. And then it harbors the slide, transferred in charge carrier. And then you collect it somewhere. This is the aiming of the project. So we start like simple. So we build first like a model for suitable for doing molecular dynamic simulation, which is a layer, two layers of surfactant, which is basically soap and a box of water, in this case of 4055 water molecule. So we run the simulation in grommets. For that, we use some molecular mechanics. Therefore, we stay all the time in the ground state. So for the water, we use a force field SPCE and surfactant, which is a complex with a hydrophilic tail and hydrophobic head. It's a very common one, very commercially available, which is excited to be called monodacyl ether. But I have to say about this surfactant, that is a neutral one. So in our simulation, we stood all the time in the concentration of the surfactant, in which it formed, it covered all the surface. But you don't have other structure like micelles forming. So we have in the work chemists, for people who know about the field, known as critical micelle concentration. So for that, then, we compute the electron. We found that the water, in this case, in this specific surfactant permeate a lot. And then we compute the diphyl orientation of water molecule at the surface. For that, we establish a Gibbs divided interface, in which is the half of the density of water, because it permeates all the surfactant all the way, even in the hydrophilic part. And we have a flipping of the dipole projection of water. I mean, we expected the net dipole projection because the symmetry breaking on the surface, but not the flipping. It's not something that we kind of expected so enhanced in this kind of system. Also, it's worth to say that the flipping occurs in the transition from the hydrophobic to hydrophilic part. So that led us to study or to kind of investigate how is the hydrogen bond pattern in this kind of system. So these are a cartoon how of that of two snapshots of how it looks the water in the surfactant. The first one in the order most left, you have water interacting with the surfactant. And also in the middle, you have water interacting with water. So kind of the surfactant comes to this route of to change the hydrogen bond pattern. Therefore can lead up to explain why the orientation of water molecule over and below the GDI. Here is a cartoon, of course, how it looks like the projection of the dipole moment. Having said so, we went to get an idea. No, I have a question. Sorry. Can I ask, please? So is it like this water is following this hydrophilic part of the surfactant? Because your hydrophilic part is fluctuating. So it is towards the bulk side. And in some time, maybe it turns towards the vacuum side. So is it like that the water is interacting with this part and its slave to its motion? Actually, yes. The water interacts with the hydrophilic, but it fluctuates. Actually, the whole surfactant fluctuates from previous results that we got. And it correlates in the order of nanosecond. I mean, it fluctuates a lot. It changed the distance. It changed the orientation. And sometimes the water get trapped in the hydrophobic part and stay there. They cannot move because they have a physical barrier which is a surfactant. Did I answer your question? OK, thank you. So we went to the hydrophilic part and skipping all technicality which strikes from figure is that we have, each curve represents a hydrophilic network. And basically what we saw is an enhancement of the hydrophilic network. That means that the surfactant act very active in changing or disrupting the normal or the water hydrant bond network. So in parallel collaborators, they perform the kind of corroborate part of our results. Sorry, we got a question. In the previous slide, what previous slide? This one? What do they mean? No, no, next one, here, here. What do the different symbols mean? Well, basically, this is regarding to the connection of two hydro, of hydrant bond. I mean, in the sense of you have two molecules or two oxygen atoms. And for instance, they could share a hydrant. If you took one atom, one of those, as a reference, they could give, which is an out, the hydrant, or at the same time receive, get from another oxygen another one. That could be one out, one in, for instance. OK, OK. So this is in terms of the flux of x. Exactly, exactly. This is how they share the hydrant. Perfect, perfect. Thank you. OK. Basically, skipping all technicality, the way that that explains sometimes that you have some dangling hydrant in the surface, even though they have the presence in the hydrophobic part. But skipping all, you have an enhancement of the hydrant bond network. I mean, it disrupts the surfactant, disrupts completely the presence of the weight that wouldn't usually share the hydrant. So this is an experimental result from the collaborator from Amalf in Netherland. They perform the SFG spectra. And basically, in the cartoon, I think the most, for specialists, of course, they can see everything. But I mean that the best way to see it is the cartoon below in which you have an enhancement of the hydrant bond network at the concentration near to the CMC, or even higher, but also the orientation of the water below and over the GDI. Of course, GDI is a very computational thing that we get. But basically, they can get the orientation in the hydrophobic and the hydrophilic region of the hydrant bond, which basically is more or less the same that we get. So we have another orientation of the dipole. So we have charge. Then we went for the electric field in the surface. For that, we take this three-card tune, and we separate the whole system, which take in account the water and the surfactant alone. Of course, sorry, sorry, the surfactant alone, and also the water alone. For that, we compute the electric field along z-coordinate average over time. This is an aesthetic way to see electric field. So we have a net electric field that are pulling toward the bulk. But also, you have a flipping, the competition or contrasting effect between water and surfactant. And sometimes the surfactant won't sometimes, well, it tend to decay the effect of the water. But you have the flipping. But again, this is an aesthetic picture. This is a very fluctuating system anchored a photosynthesizer in the surface that is going to harvest light and transforming charge cardio. It has to take in account the times of the fluctuation. It has to take in account the orientation of the electric field vector in which could be pulling toward the bulk, which is in the average case, or are pushing away from the bulk. So this is the autocorrelation function of the whole system, which is the upper left. This one is the whole system. This is for the autocorrelation function of the electric field as a function of z of the surfactant only. And this is for the water only. We are interested in the, I mean, this is a lot of things to get. This is an ongoing work. And we went on the GDI near to the borderline of our borderline. So we get that. Ricardo, Ricardo. Yes. You should finish in four minutes. OK. OK. I'm trying to wrap up. Then basically what we get is that everything decorrelates like in the high cost second time scale. But and then we try to see what happened with, well, the effect of the electric field is very important. There is a very important topic in modern chemistry and how I use the electric field. And then we went for our photosyntheticizer. That is basically well known. It has the advantage to have a very long time, lifetime of the excited state, and very well done. So I'm going to, this is the cartoon of how it looks on our interface. And this is how it looks on our interface. This is how it's going to look on our photosyntheticizer inside. So we compute the, we've removed everything, and we've taken account just the effect of the interface, which is basically compute the electric field. I'm going to skip these two slides. And I'm going to come here. Here we have the energy gap between the homo-lume electronic population. We have a zero volt per nanometer. We have like three electron bond gap. But if the electric field goes toward the bulk, it tends to lower the energy gap of the photosyntheticizer. But if the electric field goes in the region, in the opposite direction, which is in the region where there are higher density of water, then that could be the undesired effect in the sense that it wider the gap between the homo-lume. So another comment about this kind of photosyntheticizer is a two plus charge. So even though the effect on the efficiency and harvest line, we have to see the effect how well anchored going to be in the presence of this electric field. So for the sake of time, I'm going to skip these slides. Well, we compute the absorption spectra, which is in accordance with the present of the electric field. Get red-shifted, and kind of is something that we expected. So trying to wrap up everything. Well, the first conclusion so far from this part of the work is that the present of the surfactant, disrupts the arrangement in the interface electrically speaking. I mean, it changed the hydrogen bond network, and this is something to take into account. This consequence of this arrangement lead to a rise of a strong electric field in the surface that goes even deeper in the bulk, like 20 amperes. And getting a photosyntheticizer in the surface, you have to take in account this. Also, the presence of this electric field should lead us to choose a proper photosyntheticizer in order to put it. There it works properly. So so far, this is, thank you for your attention. And if I have time, I could take some questions. OK. Thank you very much. Thank you. A very nice and interesting presentation. So we could have one quick question. Elham is asking. So please. Can you hear me? Yes. Yep. OK. We can do a thanks for your presentation. A very quick question. Have you ever calculated transport properties like electrical conductivity and stuff like that? No. We actually, this is recently baked. I mean, everything that are presented here are completely new. And actually, we have more questions than answered. So no, we didn't compute anything yet of that. This is everything new for us. I mean, the implication, the electric field, the effect of the electric field in all their properties. I mean, this is something completely new for us. We are getting in. OK. Great. Thank you. You're welcome. OK. Thank you very much. So with this, we pass to the next speaker. Thank you, Ricardo. Please.