ThE BeAuty in CheMistry
If you studied on these videos in high school, chemistry would be the favorite subject of many: Yan Liang , a scientist and "visual expert", knows well that he decided to put the spectacular results of some chemical reactions at the center of the scene too. microscopic to be appreciated.
The Beautiful Chemistry and Envisioning Chemistry series were born, collections of videos showing different types of chemical reactions taken with the latest photographic and laboratory technologies: high resolution microscopes, infrared cameras for thermal imaging, high-speed cameras or 4K (about 4 thousand horizontal pixels of resolution).
The goal is to demonstrate that you can fall hopelessly in love with chemistry, "very visual, but difficult to appreciate with the naked eye," explains Liang.
The first video series - Beautiful Chemistry - commissioned three years ago by some leading Chinese research institutes (such as the University of Science and Technology) had a worldwide success. Liang then founded the Beauty of Science project, a collaboration with the Chinese Chemistry Society that led to this second series, entitled Envisioning Chemistry.
Credits Envision Chemistry
CHEMICAL GARDEN
Add a metal salt to a sodium silicate solution and in a short time you will see some solid metal structures that seem to bloom and bloom like buds and leaves of a tree (or like the antennae of an alien snail).
It is a semipermeable membrane of metal silicate, which can only be traversed by water. Because of the osmotic pressure, the water enters the membrane and breaks it, generating other insoluble membranes. The cycle repeats itself and the structures grow upwards like plants : the process was first described by the German chemist Johann Rudolf Glauber in the mid 1600s.
Credits Envision Chemistry
METALS THAT DISAPPEAR
They may seem indestructible, but metals also dissolve easily if immersed in the right liquid. In this video we see six (aluminum, magnesium, copper, lithium, potassium, sodium) go in strongly acidic or basic liquids, or in water.
Credits Envision Chemistry
COMBUSTION
If you think that all bonfires are the same, maybe it's because you saw only wood or charcoal burn. The forms assumed before and after combustion, and the color of the flames themselves, vary according to the material that burns (here we see five: coal, sodium, phosphorus, magnesium and sulfur). Some substances produce luminous flames, others are hypnotic in the act of combustion, others still become it in the end - and these macro and slow motion images allow you to appreciate the various nuances.
Credits Envision Chemistry
BLACK AND WHITE
This video showing the transformations of lead (in black, in the second part of the film) and silver (the yang of this metal pair) has been recognized in the top 10 of the National Geographic Short Film Showcase 2016 , and it is easy to see why.
One metal can undermine another, less reactive one, from its saline solution: since copper and zinc are more reactive than silver and lead respectively, added to two solutions of silver nitrate and lead nitrate have brought out microscopic colored crystals of the two metals ( similar to bubbles). All filmed under a microscope, and with a perfect background of electronic music.
Credits Envision Chemistry
ELECTRODEPOSITION
This process allows to cover a metal with a thin layer of another metal, through the phenomenon of electrolytic deposition . In a tank containing, in an aqueous solution, the salt of the metal to be deposited, two electrodes are immersed (one of which is the metal to be covered) and a potential difference is applied: the cations, i.e. the ions with positive charge, of the metal to be deposited, they will move towards the cathode, the metal to be covered, negatively charged.
The reaction is usually used to cover objects for decorative purposes or to protect them from corrosion. Here we see the repeated process on 5 different metals: copper, zinc, lead, silver and tin.
Credits Envision Chemistry
EXOTHERMIC REACTIONS
Many reactions release heat, but it is not possible to notice it except with infrared thermal cameras, which show temperature variations during the processes. The video shows five in rapid succession, alternating between thermal images and normal reagent shooting.
In this we will observe the dissolution of sodium hydroxide (caustic soda, NaOH), the dilution of concentrated sulfuric acid, its hydration reaction with the paper, the neutralization between hydrochloric acid and sodium hydroxide in solution, and that between sodium and water.
Credits Envision Chemistry
CRYSTALLIZATION
Crystals are as fascinating as the processes that form them. To resume the transformation, Liang added droplets of 5 different saturated solutions of salts to the microscope slides, and then resumed the crystallization while the water evaporated. The reaction has been captured over time thanks to time-lapse photography.
So many innovative info involve here,
scientific research, love for you @afifa friend
This is the difference between developed and developing countries in employing one of the technologies and devices for the service of education
The use of video technology in the physical sciences and chemistry makes the student engage with these materials and away from their risks