Yang Fei is not a star, even if he is a star, some people don’t know him! Ang Lee is so famous, but isn’t it that some people don’t recognize him?

The boy said: "I don't recommend using high bubble formula, I asked the tutor to go!"

Zhu Lin said: "With Yang Fei here, it's useless to ask anyone you come to. Even if the tutor comes, you have to listen to Yang Fei!"

The boy really doesn't know Yang Fei. After all, the school is so big and there are so many students. Yang Fei has few opportunities to show his face. He looked at Yang Fei again, smiled and said, "How could he have the final say? I will stick to the matter of low-brows! This is the direction of science and technology development, and it is also the truth I believe!"

Yang Fei said: "I just said that no one is right or wrong in this matter. Shampoo, shower gel, and hand sanitizer will all contain surfactants, such as sodium lauryl sulfate, which can play a cleansing role."

Next, he roughly explained the principle of shampoo removal.

Surfactants have both hydrophilic and oleophilic ends. The oleophilic part is generally non-polar groups such as long-chain alkyl groups, which has a large force with organic matter and a small force with water; the hydrophilic part is generally polar groups such as sulfonic acid groups, which has a large force with water and a small force with organic matter. When interacting with oil stains, the oleophilic group is inserted into the oil stains inwards, while the hydrophilic group is outwards, so the surfactant wraps the oil stains in a ball.

The structure of the lipophilic group formed by surfactants is inward and the hydrophilic group is outward is called micelles. The surfactant interacts with oily substances that are insoluble in water, and the process of increasing the solubility of insoluble substances is called micelles solubilization. Washing the oil on the hair is used to solubilize the surfactant.

Another major function of surfactants is to reduce the surface tension of water, so that the surface tension that needs to be overcome when the oil is dispersed into oil droplets is reduced. The interface energy of small oil droplets on the oil-water interface is lower, so the emulsion is thus stabilized. After the oil dirt forms a relatively stable emulsion in water, it can be easily washed away with water.

Before we wash our hair, we will first beat the shampoo evenly in the palm of our hands. This is actually a stirring process, in which the solution containing the surfactant is fully in contact with the air.

If there is no oil stain in the hair and the lipophilic group is used to act, the lipophilic group will stay away from water and form bubbles, which is why the foam is abundant.

The less oil stains, the more surfactant involved in the formation of bubbles, and the more foam it forms; the more oil stains, the less surfactant involved in the formation of bubbles, and the less foam it forms. This explains why we all think that when we wash our hair clean, we will bubble more, and when we are dirty, we will bubble less.

From this we can see that blistering is actually just a by-product produced during the washing process, and this is not an indicator to determine whether the shampoo is good or bad.

When the boy saw Yang Fei talking and talking in a slight manner, he couldn't help but look at him with admiration and asked, "Classmate, how many years old are you in? Your professional knowledge is very solid."

Zhu Lin burst into laughter and said, "You may not believe it. Yang Fei was just in his freshman year and was our junior. And he often took leave and skipped classes. What makes people hate the most is that he has not failed his homework and his grades are still so excellent."

Yang Fei smiled indifferently: "The world is about knowledge, and society is about schools."

The boy suddenly said, "I remember, are you President Yang of the school's entrepreneurial club?"

Yang Fei said: "Yes."

The boy said: "I often mention President Yang, but I have never seen you. The project we are currently studying is the product of your Jiebai Company!"

Yang Fei said: "The effects of shampoo are diverse. Everyone has different hair properties, and the regions and individuals vary greatly. Therefore, we should develop several different types of shampoos to meet the needs of different groups of people."

Zhu Lin said: "President Yang, we girls usually buy shampoo, but they only choose those with rich foam. They always think that more foam means shampoo. Even if this is not a hard indicator, it is also a psychological hint that will affect consumers' choices."

The boy said: "You girls are just pretentious! You know that this is a psychological hint, but you will be fooled!"

Yang Fei smiled and said, "The foamy shampoo contains ingredients such as lauryl polyether-3 sodium acetate, dichlorobenzene biguanide hexane acetate, etc., but the stain removal and washing power are slightly poor. Because it is weakly acidic, it has less irritation to the scalp, and can interact with the charge on the hair to keep the hair smooth and smooth and not frizzy, so it is suitable for frizzy hair. We call it the acetic acid system. Therefore, this shampoo must have more foam. But other foams should be quite less."

The boy was stunned and asked, "President Yang understands this business very much?"

Yang Fei smiled and said, "If you have to rely on this industry, how can you do it if you don't know?"

In addition to the acetic acid system, Jiebai has also developed an amino acid system that is suitable for dry hair. The most important ingredients in the formula are sodium lauroyl glutamate, sodium lauroyl ether sulfate, etc.

There is also a betaine system suitable for sensitive skin, which uses sodium cocoyl glutamate, cocamidopropyl betaine and other ingredients to achieve better moisturizing effects and is suitable for people with sensitive skin.

There is also a type of human hair that has been damaged and needs to use a protein series. The formula contains hydrolyzed collagen, milk and other substances, which is suitable for repairing damaged hair.

As for the daily care of ordinary people, glucoside is mostly used.

The formula often contains the words glucoside, such as dodecyl glucoside.

The main ingredients of this shampoo are extracted from glucose, which has a slightly weak detergent effect, but is less irritating, high safety, and rich foam. It is usually mixed with amino acid systems to enhance the detergent effect without reducing safety.

In addition to these five major systems, there are two series of common shampoos on the market, namely sulfuric acid and lithost.

These two series of shampoos are generally cheaper.

The former uses sodium dodecyl ether sulfate and sodium dodecyl sulfate, while the latter uses sodium fatty acid salt and sodium hydroxide. Although it has strong detergent power, it will damage the body's beneficial oils and make people's hair dryer the more they wash. If you use too much inferior chemical composition, the hair will even become like dry grass.

In short, whether the foam is rich or not, it depends on what type of shampoo is, and it cannot be generalized.

After hearing this, Zhu Lin and the boy nodded and said yes, admiring Yang Fei.

Yang Fei talked with the students in the research group for more than an hour. His extensive knowledge and grasp of society, market and people's hearts quickly conquered the hearts of these top students.

"What we want to develop is the five series of products mentioned earlier, which can basically cover the hair quality of most people." Yang Fei said, "Shash is different from washing powder. It acts directly on the skin of the human body, and it is the most important part of the head. It is related to the image issue that everyone cares most. This is the top skill! Please, everyone must do their best to perfect the formula!"

At this moment, Luo Hong suddenly walked in and smiled and said, "Hello everyone, I'm back!"

As soon as he saw Yang Fei present, the smile on his face froze.

Yang Fei said bluntly: "Senior Brother Luo, this is the research team of white products, and you are the R&D assistant of Procter & Gamble. It's not appropriate for you to come here!"

Luo Hongcai was very thick-skinned, smiled and walked in without any mind.

Set a small goal first, for example, remember in 1 second:
Chapter completed!