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Topic: Triboluminescence


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In the News (Sun 21 Jul 19)

  
  Triboluminescence - Wikipedia, the free encyclopedia
Triboluminescence is an optical phenomenon in which light is generated via the breaking of asymmetrical bonds in a crystal when that material is scratched, crushed, or rubbed.
This is a variant of luminescence; the term comes from the Greek tribein (to rub) and the Latin lumin (light).
The first recorded observation however, occurred even earlier and is attributed to English scholar Francis Bacon when he wrote in "The Advancement of Learning"[1] that he noticed a glow as he chopped blocks of cane sugar at night in 1605.
en.wikipedia.org /wiki/Triboluminescence   (437 words)

  
 Sugar and Spice...and Light - Linda M. Sweeting
She first viewed triboluminescence while working in a dark laboratory and has recently authored several papers on the spectra and structure of triboluminescent crystals.
The phenomenon is most commonly called triboluminescence, form the Greek verb meaning "to rub." It is very common in natural materials: minerals and rocks such as mica, quartz, and granite; plant extracts such as menthol and tartaric acid; and even bones.
To see the triboluminescence of sugar, strike the cubes against each other as if you were striking a match, or use a mortar and pestle to grind it.
www.worldandi.com /specialreport/1989/april/Sa15206.htm   (339 words)

  
 Untitled Document   (Site not responding. Last check: 2007-10-21)
Triboluminescence is light produced while striking or rubbing two pieces of a special material together.
The spectrum of the light produced from the triboluminescence of sugar (sucrose) is the same as the spectrum of lightning.
Triboluminescence varies widely from one mineral sample to another, such that it might be unobservable.
outreach.phys.uh.edu /Chemexperiments.htm   (2373 words)

  
 Science News Online - This Week - News Feature - 5/17/97
They tested the crystals for triboluminescence by mashing them with a glass rod in a test tube and watching carefully for light.
A surprising finding underscored the significance of impurities: One of the asymmetrical compounds also lost its ability to flash when purified, indicating that impurities may be required to generate light even in asymmetrical materials.
Sweeting imagines that one day, triboluminescent coatings could be used in remote sensing applications to signal mechanical failure.
www.sciencenews.org /sn_arc97/5_17_97/fob2.htm   (473 words)

  
 TRIBOLUMINESCENCE FACTS AND INFORMATION
WintOGreen Lifesavers work especially well for creating such sparks, due to the fact that wintergreen oil (methyl_salicylate) is fluorescent and converts ultraviolet_light into blue light.
The first recorded observation however, occurred even earlier and is attributed to English scholar Francis_Bacon when he wrote in "The Advancement of Learning"http://www.gutenberg.org/etext/5500 that he noticed a glow as he chopped blocks of cane_sugar at night in 1605.
The scientist Robert_Boyle also reported on some of his work on triboluminescence in 1663.
www.sightfacts.com /triboluminescence   (404 words)

  
 Crystal Structure and Triboluminescence 2. 9-Anthracenecarboxylic Acid and Its Esters   (Site not responding. Last check: 2007-10-21)
Triboluminescence activity is usually assumed to be a consequence of crystal dissymmetry; however, the multitude of reports of centrosymmetric triboluminescent materials cast doubt on that assumption.
We examine here the connection between triboluminescence and crystal symmetry without prejudice, by synthesizing 12 esters of 9-anthracenecarboxylic acid and correlating their triboluminescence activity and that of the acid with crystal structure, purity, and photoluminescence.
In this series, a noncentrosymmetric crystal structure is necessary but not sufficient for triboluminescence in relatively pure materials; impurities are necessary for triboluminescence activity in all centrosymmetric and one noncentrosymmetric materials.
pubs.acs.org /cgi-bin/abstract.cgi/cmatex/1997/9/i05/abs/cm960438r.html   (179 words)

  
 Howstuffworks "Why do Wint-O-Green Life Savers spark in the dark?"
This effect is called triboluminescence, which is similar to the electrical charge build-up that produces lightning, only much less grand.
Triboluminescence is the emission of light resulting from something being smashed or torn.
Triboluminescence occurs when molecules, in this case crystalline sugars, are crushed, forcing some electrons out of their atomic fields.
science.howstuffworks.com /question505.htm   (277 words)

  
 Triboluminescence by A. Griffin Summary   (Site not responding. Last check: 2007-10-21)
This phenomenon is known as triboluminescence - the emission of light by crystalline solids when they are crushed or fractured.
The origin of triboluminescence is still under debate since the proposed mechanisms do not occur for all materials.
Some triboluminescent materials, however, are centrosymmetric and in these cases it is not possible for the light emission to occur by this mechanism.
www.shvoong.com /science/4066-triboluminescence   (479 words)

  
 Nanotribo.org   (Site not responding. Last check: 2007-10-21)
Yet another important issue is whether or not behaviour is determined by the average properties of the interface, or whether impurities, adsorbents or special sites (perhaps where a dislocation intersects the surface) are particularly important.
Triboluminescence is a well known macroscopic observation: Visible and ultraviolet light is emitted when surfaces of a variety of substances are scratched.
The effect is closely related to contact charging, since the light emission is often initiated by an electric discharge in the breaking contact.
www.nanotribo.org /projects/project_08/index_html_print   (279 words)

  
 Archives of Environmental Health: Physical Dosimetry and Biological Indicators of Carcinogenic Risk in a Cohort of ...   (Site not responding. Last check: 2007-10-21)
We performed concomitant measurements of triboluminescence during mechanical activation, with the polytetrafluoroethylene probe under mechanical tension of 125 kPa and a rotation speed of 1 000 rpm for 5 s in an atmosphere of highly purified nitrogen under 990 hPa pressure.
The determination of the optical characteristics of triboluminescence of the condensate of exhaled air became the basis for our subsequent mathematical assessment of the carcinogenic risk among those subjected to harmful ecological factors after the Chernobyl NPP accident.
To determine the optical characteristics of triboluminescence condensate, we conducted patient studies on 71 men (average age = 46 [+ or -] 2 y).
www.findarticles.com /p/articles/mi_m0907/is_6_53/ai_53521638   (1290 words)

  
 Lighting Up The Lab: Structural Anomalies Make Many Materials Flash Under Pressure, New Study Shows
"Triboluminescent materials are usually noncentrosymmetric, meaning that their structure looks more like an arrow than an X," says Sweeting, a professor of chemistry at Towson State.
While sugar emits light mainly in the ultra-violet range, she says, the presence of methyl salicylate in wintergreen candy shifts its emissions into the visible range.
Triboluminescence was assessed objectively, by measuring the wavelength of light.
www.eurekalert.org /pub_releases/1997-05/UoD-LUTL-150597.php   (609 words)

  
 Ice Flash   (Site not responding. Last check: 2007-10-21)
According to Alexander JJ Rice (8 Feb 2004) the phenomenon is a form of what is called "triboluminescence." Here are two links which discuss the subject.
The latter is closest to the Ice Flash phenomenon in that the nitrogen molecules of air are involved.
If we are dealing with triboluminescence, instead of piezoluminiscence, then we would be concerned with the breaking of the electrical bonds between the ice and the ice tray.
www.ebicom.net /~rsf1/fun/iceflash.htm   (341 words)

  
 Triboluminescence | MERLib.org
Triboluminescence: An internal glow or luminescence produced when two or more crystalline rocks of similar composition are rubbed hard together or struck against one another and is attributed to the energy given off by the electrons contained the rocks as they return from a pressure-induced, excited state to their rest orbits.
This glow is attributed to the energy given off by the electrons contained the rocks as they return from a pressureinduced, excited state to their rest orbits.
During the emulsion of the elements of the indrawn air, a higher form of triboluminescence may have been produced between the two rilled diaphragms due to the mutual 'abrasion' of the particles under extreme cen21: Implosion 293 tripetal compaction, which would have infused and iridesced the whole of the interstitial space.
merlib.org /node/997   (726 words)

  
 Structural anomalies cause materials to 'flash' (05-22-97)   (Site not responding. Last check: 2007-10-21)
Triboluminescence-the phenomenon that prompts certain materials to emit light when fractured or deformed-has traditionally been associated with structures that lack a center of symmetry, according to Arnold L. Rheingold and his students in the Department of Chemistry and Biochemistry, who co-authored the journal article with Linda M. Sweeting of TSU.
"Triboluminescent materials are usually noncentrosymmetric, meaning that their structure looks more like an arrow than an X," said Sweeting.
Then, they compared the triboluminescent activity of the acid and its esters with each material's crystal structure and purity, determined by Rheingold and his students.
www.udel.edu /PR/UpDate/97/32/23.html   (559 words)

  
 Crazy Aaron's Puttyworld - Triboluminescence
Triboluminescence is the emission of light from rubbing, mechanical action, and fracture.
Even today we have a limited understanding of triboluminescence and much remains to be discovered.
This causes an electrical current (electrons) pass through the air which excites nitrogen molecules in the atmosphere (over 70% of our atmosphere is nitrogen gas).
www.puttyworld.com /tr.html   (938 words)

  
 Science News: A flash in the crystalline pan. (triboluminesce... @ HighBeam Research   (Site not responding. Last check: 2007-10-21)
Intrigued by her observation, Sweeting explored the subject further and discovered that the phenomenon, known as triboluminescence, was not well understood although it had been studied for centuries.
This result suggests a general theory of triboluminescence based on the way electrical charge is separated when crystalline compounds are fractured.
The triboluminescent form, when recrystalized from methanol,appears as irregular, yellow flakes, while the nontriboluminescent form, obtained by recrystalization from the solvent dichloromethane, shows up as yellow tablets.
www.highbeam.com /library/doc0.asp?DOCID=1G1:5028426&refid=holomed_1   (571 words)

  
 www.iop.org News - DERA propose triboluminescent damage sensors   (Site not responding. Last check: 2007-10-21)
Triboluminescence - the process whereby certain materials emit light when they are fractured - has been known for nearly 400 years, but in a paper published in the August issue of Smart Materials and Structures, Dr Grant Bourhill and his co-workers outline a novel application of the phenomenon.
A triboluminescent sensor attached to, or embedded in, a composite material would give off a tell-tail flash of light if the composite were damaged.
The article, "Triboluminescent damage sensors" by I Sage, R Badcock, L Humberstone, N Geddes, M Kemp and G Bourhill (Smart.
www.iop.org /news/154   (192 words)

  
 Science News: The electric Life Saver effect: wintergreen-candy research is sparking new interest in triboluminescence
The triboluminescence of wintergreen candy has also been known for a long time, althoug various problems have limited its spectral characterization.
Although she investigated the unexplained candy-flashing phenomenon "just because it was there," Sweeting later realized her findings point toward "something that could be important"--what lies behind the triboluminescence of other perplexing crystals.
What particularly intrigued Sweeting was that although it was triboluminescent, there was no sign of what might be energizing its glow.
www.findarticles.com /p/articles/mi_m1200/is_n5_v134/ai_6551582   (866 words)

  
 Learn more about Triboluminescence in the online encyclopedia.   (Site not responding. Last check: 2007-10-21)
Learn more about Triboluminescence in the online encyclopedia.
Triboluminescence is an optical phenomenon in which light is generated via friction.
The term comes from the Greek tribein (to rub) and the Latin lumin (light).
www.onlineencyclopedia.org /t/tr/triboluminescence.html   (194 words)

  
 [No title]
Triboluminescence occurs when material is scratched, crushed, rubbed or stressed mechanically in any other way.
Since electrical discharge is in the foundation of Triboluminescence it is legitimate to classify it as a part of Electroluminescence.
Blue or red Triboluminescence can be observed when sawing a diamond during the cutting process.
www.princetoninstruments.com /spectroscopy/fl_lu.aspx   (1519 words)

  
 Triboluminescence - TheBestLinks.com - Crystal, Diamond, Electric charge, Greek language, ...   (Site not responding. Last check: 2007-10-21)
Triboluminescence - TheBestLinks.com - Crystal, Diamond, Electric charge, Greek language,...
Triboluminescence, Crystal, Diamond, Electric charge, Greek language, Light...
However, there are substances which break this rule, and which do not posess dissymmetry, yet display triboluminescence anyway.
www.thebestlinks.com /Triboluminescence.html   (298 words)

  
 Sugar and Spice...and Light - NATURAL SCIENCE
Luminescence results when an atom or molecule receives energy that is sufficient to excite an electron into an unusually high energy state; when the electron energy drops back to normal, the excess energy is released from the molecule as light.
The color or spectrum of the light depends on the structure of the atom or molecule; some of the light may be ultraviolet or infrared, and thus invisible.
The spectrum of the triboluminescence emission reveals a great deal about the cause of the phenomenon.
www.worldandihomeschool.com /public_articles/1989/april/wis15206.asp   (472 words)

  
 Triboluminescence and piezoelectric behaviour of orthorhombic crystals
Triboluminescence activity and charge produced during fracture have been measured in many organic crystals of the orthorhombic system.
The crystals belonging to disphenoidal and pyramidal classes which are piezoelectric exhibit triboluminescence, however, the crystals belonging to the dipyramidal class which are non-piezoelectric do not exhibit triboluminescence.
This fact suggests the piezoelectric origin of triboluminescence and shows that triboluminescence is a structure-sensitive property of the crystals.
stacks.iop.org /0022-3719/12/L695   (197 words)

  
 Triboluminescence   (Site not responding. Last check: 2007-10-21)
WintOGreen Lifesavers produce an example of what's called triboluminescence.
Step one happens when sugar crystals break -- they tend to split along planes with positive charges on one side and negative on the other.
Here's a link to more information about triboluminescence.
www.geocities.com /RainForest/9911/tribo.htm   (170 words)

  
 Gr 8 Light and Optical Systems - Tech Idea
Triboluminescence is the creation of light through the motion of rubbing one surface against another.
In this lab, triboluminescence will be investigated in a sugar cube.
For this activity, a light sensor is used to measure the light emitted from a crushed sugar cube.
www.scienceman.com /scienceinaction/pgs/techid_8u3_06.html   (311 words)

  
 Triboluminescence: An Inquiry
It was important to relate the material to something they were familiar with so that they could see the purpose of the learning.
Both lightning and the glow from a life saver are examples of triboluminescence.
They were asked to create an experiment to determine if the wetness of the lifesaver makes any difference in an aspect of the spark (intensity, color, etc.).
portfolio.washington.edu /pikachu/secondarytep/88285.html   (1045 words)

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