Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists develop molecular thermometer for contactless measurement using infrared light

14.06.2017

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM) in Berlin have developed a molecular thermometer. The gemstone ruby served as the source of inspiration.


The molecular ruby in a solid (red) and dissolved (yellow) state can be used for contactless measurement of temperature.

photo/©: Sven Otto, JGU

However, the thermometer developed by the team headed by Professor Katja Heinze at the JGU Institute of Inorganic Chemistry and Analytical Chemistry is a water-soluble molecule, not an insoluble solid. Like a ruby, this molecule contains the element chromium that gives it its red color, which is why it has also been dubbed the molecular ruby.

This molecular ruby can be used to measure temperature in many different environments thanks to its solubility: it can be introduced into liquids, solids, nano-particles, and micelles. Thus, it has potential applications in the fields of the material sciences, biology, and medicine.

Measuring the temperature with the molecular ruby is very straightforward. The relevant site is irradiated with blue light, which is absorbed by the molecular ruby that then emits infrared radiation at two different wavelengths. Depending on the temperature, there is more intense emission of infrared at one of the two wavelengths. The temperature is then determined on the basis of the corresponding ratio of intensity of the two wavelengths.

"Anyone with a simple emission spectrometer can undertake this kind of measurement," explained Sven Otto, a doctoral candidate in Heinze's team. "The molecular ruby works at 100 degrees Celsius just as well as at minus 63 degrees Celsius, that is in a range relevant to everyday practice," added Otto.

The principle of optical ratiometric temperature measurement is not new. However, it was previously impossible to take measurements using only a single type of photoactive agent. To date, scientists always needed two dyes, i.e., one that produced emission dependent on temperature and another reference dye with emission independent of temperature. That made synthesis and calibration a lot more difficult.

"Our molecular ruby, on the other hand, is simply made from inexpensive raw materials and no additional reference substances are required to measure temperature," said Professor Katja Heinze. "It can be employed whenever we want to measure temperature without having to contact the object directly as with a conventional thermometer."

The research findings have been published in a special edition of Chemistry – A European Journal designed to mark the 150th anniversary of the German Chemical Society (GDCh) and featuring contributions from eminent German researchers.

The research work is being funded by the German Research Foundation (DFG) within the framework of, inter alia, the Graduate School of Excellence Materials Science in Mainz (MAINZ). The DFG recently approved a new priority program entitled "Light-controlled reactivity of metal complexes" that is coordinated by Professor Katja Heinze.

Photo:
http://www.uni-mainz.de/bilder_presse/09_anorgchemie_rubin_thermometer.jpg
The molecular ruby in a solid (red) and dissolved (yellow) state can be used for contactless measurement of temperature.
photo/©: Sven Otto, JGU

Publications:
Sven Otto et al.
Thermo-Chromium: A Contactless Optical Molecular Thermometer
Chemistry – A European Journal, 15 May 2017
DOI: 10.1002/chem.201701726
http://onlinelibrary.wiley.com/doi/10.1002/chem.201701726/abstract
http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1521-3765/homepage/2111_gdc...

Sven Otto et al.
[Cr(ddpd)2]3+: A Molecular, Water-Soluble, Highly NIR-Emissive Ruby Analogue
Angewandte Chemie International Edition, 12 August 2015
DOI: 10.1002/anie.201504894
http://onlinelibrary.wiley.com/doi/10.1002/anie.201504894/abstract

Contact and further information:
Professor Dr. Katja Heinze
Institute of Inorganic Chemistry and Analytical Chemistry
Johannes Gutenberg University Mainz
55099 Mainz, GERMANY
phone +49 6131 39-25886
fax +49 6131 39-27277
e-mail: katja.heinze@uni-mainz.de
https://www.ak-heinze.chemie.uni-mainz.de/

Weitere Informationen:

http://www.bundesgraduiertenschule-gruppe-mainz.uni-mainz.de/ – Graduate School of Excellence Materials Science in Mainz ;
http://www.uni-mainz.de/presse/aktuell/1212_ENG_HTML.php – press release "Johannes Gutenberg University Mainz to coordinate new DFG priority program in photochemistry", 25 April 2017 ;
http://www.uni-mainz.de/presse/17824_ENG_HTML.php – press release "Katja Heinze receives research award for intelligent food packaging with freshness indicator", 5 December 2014

Petra Giegerich | idw - Informationsdienst Wissenschaft

More articles from Life Sciences:

nachricht Scientists uncover the role of a protein in production & survival of myelin-forming cells
19.07.2018 | Advanced Science Research Center, GC/CUNY

nachricht NYSCF researchers develop novel bioengineering technique for personalized bone grafts
18.07.2018 | New York Stem Cell Foundation

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Future electronic components to be printed like newspapers

A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.

The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes

20.07.2018 | Power and Electrical Engineering

Reversing cause and effect is no trouble for quantum computers

20.07.2018 | Information Technology

Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern

20.07.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>