In the future, food will only be wrapped in a piece of tissue paper, and will be waterproof and germ-proof. This magical paper is called "nano paper". Yesterday, its founder, Huang Jianguo, a professor in the Department of Chemistry of Zhejiang University, uncovered this magical mystery for this reporter.
This is a piece of paper that is innocent and intrusive. It looks like ordinary paper. But its function is very powerful. Adding different chemicals on paper can be of great use.
For example, it can be an ideal food wrapping paper. Adding a fluorocarbon chain compound to the nano paper is like adding a layer of self-defense clothing, which is waterproof, oil-proof, and even bacteria-proof.
To this end, Huang Jianguo made an experiment. The nano-paper is pressed in the bacterial culture solution. As a result, the paper is still innocuous and insulated from bacteria.
Nano paper can also be used for food and environmental testing. For example, adding a dye called N719 can detect mercury in industrial wastewater. If it contains mercury ions, the original purple paper turns orange.
Nano paper, coupled with the dye aniline, can also detect nitrite ions in food. When it comes to pickled foods with high nitrite content, the white paper immediately turns pink.
Fluoride ions cannot escape. Fluoride in toothpaste can strengthen teeth. But too much fluoride will cause macular growth in the teeth. Nano paper, plus alizarin, can measure fluoride ion. The basis for judgment is also the color change. The depth of color change represents the different content of fluoride ion measured.
However, when testing, you have to put the test object into the water. Nano paper can only work after contact with water.
Treating sewage is another new function of nano paper. However, before that, the nanopaper must be calcined at a temperature of 450 ° C. After calcination, it is useful to obtain titanium dioxide nanotube materials or carbon-containing composite materials. After putting it in the sewage, a magical change occurs immediately: the color in the water fades, and the harmful substances are decomposed.
Where is the secret of the magic nano paper?
Why is this seemingly ordinary paper so magical? Yesterday, Huang Jianguo revealed the secret.
This kind of nano paper is filter paper wrapped by titanium dioxide film. The filter paper itself is a fiber structure. Titanium dioxide, in fact, "is everywhere in our lives, it is a food additive, non-toxic and harmless. On the outer packaging bag of food, you can see the description of this ingredient." Huang Jianguo said. It also has a characteristic that is very "wild" and can be combined with most chemicals.
The main point of making this kind of paper is to wrap the titanium dioxide film on the fiber of the filter paper with nanometer precision to provide a platform for further functionalization. In this way, the function of nano paper becomes powerful.
So, how does this work?
In a filter, put a piece of ordinary filter paper. The next step is crucial: first filter a solution of a titanium alkoxy compound to make it adsorb on the filter paper fiber, and then add water to hydrolyze it.
In this way, a thin layer of titanium dioxide firmly "sticks" to the nanofibers of the filter paper. Further, by introducing different functional molecules onto this layer of titanium dioxide, a series of new materials are obtained.
In fact, the manufacturing cost of a piece of nanopaper is extremely low. Calculating the material cost alone, "it only costs a few cents". In the near future, nano paper may be used in commercial production and appear in our lives.
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