In the future, foods can be waterproofed and deterred with only a thin tissue. This magical paper is called "nanopaper." Yesterday, its founder, Huang Jianguo, professor of chemistry at Zhejiang University, unveiled this mysterious mystery for the reporter.
This is a piece of poisonous non-invasive paper
Nanopaper looks like ordinary paper. But its function is very powerful. Adding different chemicals on the paper can make a big use.
For example, it can become an ideal food packaging paper. Nano-paper, together with a fluorocarbon chain compound, adds a layer of protective clothing that is waterproof, oil-proof and even anti-bacterial.
To this end, Huang Jianguo made an experiment. The nanopaper was pressed in the bacterial culture solution and as a result the paper was still innocuous and insulative to the bacteria.
Nanopaper 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.
Nanopaper, plus dye aniline, can also detect nitrite ions in foods. When it comes to pickled foods with a high nitrite content, the white paper immediately turns pink.
Fluoride, also can not escape. Fluoride in toothpaste can firm teeth. But too much fluoride will make the teeth grow yellow spots. Nano-paper, combined with halogen, can measure fluoride ions. The basis for judgment is also the color change. The depth of the color change represents the different levels of fluoride ions measured.
However, during the test, the test object should be placed in water. Nanopaper can only work if it comes in contact with water.
Sewage treatment is another new feature of nanopaper. However, prior to this, the nanopaper was first calcined at a temperature of 450°C. After calcination, it is useful to obtain titania nanotube material or carbon-containing composite material. When it is put into the sewage, a magical change will immediately occur: the color of the water will fade and the harmful substances will be decomposed.
Where is the secret of magical nanopaper?
This seemingly ordinary paper, why is it so magical? Yesterday, Huang Jianguo opened a secret.
This nanopaper is a filter paper that is coated with a titanium dioxide film. The filter paper itself is a fibrous structure. Titanium dioxide, in fact, "is everywhere in our lives, it is a food additive, non-toxic and harmless. In the outer bag of food, you can see this component description." Huang Jianguo said. It also has a feature that is "very wild" and can be combined with most chemicals.
To make this kind of paper, the point is to wrap the TiO2 film onto the fibers of the filter paper with nano-level accuracy, providing a platform for further functionalization. In this way, the function of nanopaper becomes stronger.
So, how can this be done?
In a filter, place a plain filter paper. The next step is crucial: First, a solution of a titanium alkoxide compound is filtered, adsorbed on the filter paper fiber, and added with water to hydrolyze it.
In this way, a thin layer of titanium dioxide is firmly "sticked" to the nanofibers of the filter paper. Further, by introducing different functional molecules into this layer of titanium dioxide, a series of new materials has been obtained.
In fact, the cost of manufacturing a nanopaper is extremely low. To calculate the material fee itself, "a few only a few cents." In the near future, nanopaper may be used for commercial production and appear in our lives.
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