Xia Zhongguo's opening remarks were very simple, nothing more than to express his welcome to the guests, and solemnly introduced Academician Fu Wenbin to show respect for the academician, and the introduction was naturally a thunderous applause.

After finally introducing the simple situation of Li Ze's sunscreen project, Xia Zhongguo said loudly: "Okay, let's ask Professor Li Ze to make a statement on the composite sunscreen project. ”

Li Ze got up from the round table, walked to the rostrum, first thanked the experts, and then began to make a statement of the sunscreen project, from the research background, technical solutions to the experimental process, the results achieved, etc., Li Ze said for more than half an hour.

He spent a lot of energy on this project from beginning to end, and experienced the initial setbacks, after Zhang Yi's technical plan came out, he devoted himself more attentively to the project, so he knew all the details of the experiment well, and there was no lag at this time, and it was done in one go from beginning to end.

After finishing his statement, Li Ze bent down to salute.

Xia Zhongguo sat at the round table near the rostrum, and there was a microphone on his seat, and then there was the expert question session, so Li Ze stayed directly on the rostrum, and Xia Zhongguo said directly: "Okay, now enter the second part of the defense, and invite the experts to ask questions." ”

On the table in front of each expert's seat is a thick book of materials, which is the material of the defense project, which details the details of the project in detail.

Since it is a question session, there is still something particular about it here, usually the one with the highest status asks the question first, otherwise other professors will not dare to come forward, but the first question does not reflect the importance of the question, or wait for others to ask the question first, and then supplement, so as to highlight the status more.

After being silent for a moment, Fu Wenbin looked at the various experts sitting next to him and said, "You ask first." ”

Various experts are also interested, and Li Jianlin, who was sitting on Fu Wenbin's right hand, took the lead and said: "Since Fu Lao spoke, then I will throw bricks and lead the jade, let's ask a small question first." ”

"Professor Li, as a sunscreen material, in fact, not only titanium dioxide can have a whitening effect, but also zinc ion iron ions, and the exchange of zinc ions is much easier, because the hydrolysis of zinc salt is not serious, and the acidity of the hydrolysate is also very weak, so there is no need to worry about the collapse of the molecular sieve skeleton during the exchange process. ”

"There's a lot more space in the choice of the subject, and it's also easy to choose the precursor of the object, because most zinc salts are easily soluble in water, so why did you choose titanium dioxide for the material you're studying?"

Li Ze smiled and said: "In fact, we have tried all these metal ions with whitening effect, but almost all the exchanges between molecular sieves and zinc salts used have failed, and even if they are exchanged many times, the zinc content of the product has not exceeded 0.1%. ”

"Correspondingly, its ultraviolet absorption is very weak, which may be due to the selectivity of molecular sieves for different metal ions, generally speaking, when using molecular sieves for ion exchange, those ions with strong metallicity and not easy to deform are easier to enter the pores as compensation ions, zinc ions are easy to deform, and most molecular sieves are not highly selective for them, so we do not choose zinc ions. ”

Li Ze has done a lot of homework on these materials, so he has no problem answering Ruliu at all.

Li Jianlin is an expert in metal materials, but when it comes to cosmetic materials, Li Ze is confident that he will never lose to him.

Hearing that Li Ze had some truth, Li Jianlin nodded silently.

When experts ask questions, they generally pick out some places that they are interested in, and at the same time feel that the respondent may be negligent, or even do not care about them, and rarely open their mouths to ask the respondent questions, Wang Muli has been turning over the information in his hand since Li Ze began to reply, and at this time he asked: "Professor Li, there is a place I don't quite understand, nanoparticles such as titanium dioxide and zinc oxide in the development of ultraviolet absorbing materials, the most serious problem encountered is the agglomeration of nanoparticles. ”

"Since nanoparticles have a fairly high surface energy, the occurrence of agglomeration and growth is thermodynamically spontaneous, in this sense, the agglomeration of nanoparticles is inevitable, in the formulation of cosmetics, after the addition of nanoparticles, due to the incompatibility with paste-based materials, this agglomeration is seriously aggravated, I want to know, even if you say that composite sunscreen has such and such advantages, how do I know if your data is true?"

As soon as Wang Muli said this, the experts below were boiling, the spontaneous reunion of nanoparticles This is the most headache problem in the nano world for many years, and it is also the main reason for restricting the development of nanotechnology.

Moreover, Wang Muli questioned the authenticity of Li Ze's data at the defense site, saying this is equivalent to slapping Li Ze in the face, could it be said that he spent so much effort to invite so many experts to come over just to expose his fraud?

At this time, Li Ze's face was a little pale, there was actually nothing to explain to a question like this, and the explanation was clearly explained in the prepared information, and it was useless for him to explain it.

I didn't expect Wang Muli to be so faceless, when Lin Sihang was still in power, he was the leader of the 863 project team of materials science, like Wang Muli, who saw Lin Sihang always respectful, but he didn't expect to turn his face and deny people now.

Professor Fan Yiming of Jiangcheng University of Science and Technology couldn't stand it anymore, and as a colleague of Jiangcheng, how could he be bullied to the door, he said: "Professor Wang can't say that, Professor Li's research results are clearly written in the data, and I heard that some time ago, a cosmetics company spent a lot of money to buy this patent, it seems to be 100 million plus 50% of the company's shares, if there is anything wrong with Professor Li's project, who would be willing to pay so much money to buy a fake technology?" And, then again, you can tell at a glance whether the data is fake or not, so do you still have to talk nonsense with your eyes open?"

Of course, these experts didn't know about the sale of patents, and now they were shocked when they heard that this technology was sold for so much money.

"This sunscreen technology is so valuable? I think it can sell for hundreds of thousands, right, are these business owners crazy?"

"That's right, my glass-ceramic technology has only been sold for 2 million, and this cosmetics technology has dared to sell for 100 million, and I also bring 50% of the shares. ”

"I think this technology is good, and it may not be possible to have a good future development prospect. ”

The experts immediately started to discuss, but Wang Muli was just choked by Fan Yiming, his face was not very good, he thought that Li Ze was a young professor, and it was nothing to say a few words, but he didn't expect Fan Yiming to jump out and speak to him directly.

Ning Que, who was sitting in the corner, looked at Lin Xiayu next to him, and asked worriedly, "Senior Sister Lin, we have no problem with this defense, right?"

Lin Xiayu threw Ning Que a sanitary eye and said, "Don't worry, the professor hasn't seen any storms, this is just an ordinary project defense, there is no need to be so nervous." ”