An exciting lecture on the phenomenon of light

An exciting lecture on the phenomenon of light

When guido kickelbick comes home and announces another lecture, the people of rottershausen are not only curious to see what interesting phenomena from the world of chemistry he will present to them again this time. They are also a little proud that the chemistry professor, who grew up here and has remained so down-to-earth despite his immense scientific and professional success, has not forgotten his homeland. Guido kickelbick has held the chair of inorganic solid-state chemistry at the saarland university in saarbrucken for the past three years.

"Let there be light was the title this time. Guido kickelbick explained the connections between scientific findings and everyday observations. In addition – as every time – he made a few attempts.

The sun
Fascinating facts he reported about the sun, the most important light source of all. , she has a 330.000 times coarser mass and 109 times coarser diameter than our earth. "In every second the sun consumes the 30.000 times the energy that mankind has been using since industrialization", he informed.
The sun is 4.5 billion years old and has since then emitted 14 billion times.000 earth masses consumed in nuclear fusion from hydrogen to helium. 165 watts per square meter hit the earth every day, 5000 times more than the energy needed. "If we could use this, it would be a super lottery", he concluded.

In this nuclear fusion, the sun consumes itself, comes closer to the earth, causes the temperature to rise by 30 degrees in a billion years and will exist for another seven billion years.

Humans see only a small spectrum of sunlight as electromagnetic rays. He does not perceive ultraviolet or infrared radiation. "Some light we perceive as warm, others as cold", kickelbick stated.

In addition, it is a question of light output, which today is expressed in "lumens" or "lux is given. "We all know watt. This characterizes the power consumption. 100 watts correspond to 1200 lumens. A lux means one lumen per square meter.", he explained. Using examples, he showed bright leds with 700 or darker ones with 400 lumens. In addition, there is the color of the light, which is given in kelvin (K): 3000 K is warm red, 4000 K is blue.

Artificial light sources
Then guido kickelbick gives over to the artificial light sources. Among the first were candles, whose flame has different colors and temperatures from 600 to 1000 degrees celsius. In an experiment, he proved that it is not the wick but the wax – heated in a test tube – that burns. "The first incandescent lamp with a carbon filament in a glass bulb was invented in 1853 by the german heinrich gobel, before edison developed the lamp with coiled filament in 1879", declared kickelbick. However, the lamp only provides five percent of the light, the rest is warmth. The luminosity is limited, he said, because the tungsten wire can withstand a maximum of 3400 degrees. The next stage was halogen light with a more coarse luminous effect, but a shorter service life due to the higher vapor pressure in the bulb.

"Today, we primarily use energy-saving lamps with starters and gas discharge to build up high voltages. Different chlorides are used. Depending on the metal, such as sodium or barium, the light color can be selected", he informed, before he showed different colors and fluorescence with experiments.
The next stage would be LED lamps in which a chip wrapped in silicone would be used. "This form seems to be gaining acceptance because of its long service life and more favorable energy balance." Alternative: flat illumination like that used in smartphones. However, it remains to be seen whether these will be able to deliver coarser amounts of light. Finally, the scientist demonstrated that light can also be created without electricity. For this purpose he prepared two solutions with the dye luminol. When the two solutions were connected, the lamp glowed for a short time.

Curriculum vitae guido kickelbick was born on 10. Born in hamm in westphalia on february 1968, he moved with his family to rottershausen, where his grandmother lived, a year later. Here he attended elementary school and transferred to the jack-steigenberger-gymnasium bad kissingen, where he passed his baccalaureate in 1987. He is married and has two children, aged five and two years. He still has close ties with rottershausen. His mother lives here. He visits her regularly. In the 1990s, he was a member of the municipal council before his scientific activities did not allow for a longer commitment.

Scientific career guido kickelbick studied chemistry in wurzburg, went on to do further scientific work in strabburg and pittsburgh, and completed this phase in 1994 with a degree in chemistry. With professor ulrich schubert, he was first a research assistant in wurzburg, then in vienna. From 2003 to 2009 he taught as an associate professor at the technical university of vienna. In addition to numerous publications in specialist journals, he habilitated on the topic of "production of inorganic-organic hybrid materials by embedding inorganic building blocks in organic polymers" with the outstanding rating of summa cum laude. Since june 2009, he has held a chair at saarland university.

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