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Press release No. 58/2018, 2018-03-12 | zur deutschen Fassung | print version | Search

Setting new standards in solids analysis

Young start-up team from Kiel University develops new reference materials for direct microanalysis of solids

How badly plants are affected by contaminated soil, what the sea floor can reveal about past climate, or what yield an ore mine could deliver in future - an analysis of the chemical composition of minerals and rocks can often provide valuable information. For accurate results, not only are high-quality measuring devices required, but also first-class reference materials, in order to be able to accurately calibrate the instruments. A young team from geosciences and materials science at Kiel University has developed a method for producing particularly homogeneous and pure reference materials for the chemical analysis of solids. The students and alumni now plan to put their idea into practice in their own company, supported by a grant by the German government and the European Union.

"Analytical devices are a bit like scales in the supermarket: they must be calibrated with a specified reference weight so that they display exactly 100 grams," said Simon Nordstad, who completed his Master's degree in Geosciences at Kiel University last year. “Although analytical devices are constantly getting better technically, the development of reference materials is not keeping pace," said the 28-year-old. This is where the idea of the start-up team comes in: they want to use a new method to produce better reference materials for industry and science, so that the analysis of components of solid materials becomes even more precise. This is interesting, for example, in areas such as mining, climate research, archaeology, materials testing, or medicine.

Start-up team wants to set new standards in solids analysis

To determine the composition of substances such as minerals, rocks, or other materials samples are analysed with a very fine laser beam. Reference materials are used to calibrate these analytical instruments, where the original raw material is extremly fine-ground and then pressed into tablet form. So far, these so-called pellets were too coarse for delivering accurate analytical results. "The particles in conventional pressed powder pellets are about 40 micrometres in size. But, the measuring beam itself is only a few micrometres wide, so it can actually only capture a single particle," explained Bachelor's degree student Leewe Schönberg, who is studying materials science at Kiel University. “For a representative analysis the composition of the entire sample must be reflected.”

With their special grinding process, the Kiel start-up team can produce tiny grains from all source materials at the nano scale. These can be pressed into ultra-homogeneous tablets - without binding agents - so in a particularly pure form. "It was previously not possible to achieve a similar homogeneity and purity in pellets. Thanks to this quality, they can be made into individual reference materials to calibrate measuring devices such as a mass spectrometer," explained Dr Dieter Garbe-Schönberg from the Institute of Geosciences, who is supervising the project as a scientific mentor.

Thereby, the young Kiel start-up team aims to do no less than setting a new benchmark in solids analysis. Their project is named accordingly: “µ-standards”, written as “my-standards”. With the Greek letter "µ" - used for size information as an abbreviation for "micro" - they want to draw attention to the fine-grained and customised production of their pellets.

Already great interest from science and industry

With its method in combination with direct solids analysis the team could replace elaborate and costly wet chemistry analytical procedures. These use concentrated acids, and therefore require particularly careful handling and appropriately equipped workstations. "As far as handling hazardous materials is concerned, our pellets are a much safer alternative," said doctoral researcher Samuel Müller, who also provides scientific advice to the team.

The idea for the new process originated when the institute’s acid laboratory could not be used for an extended period during renovations. Laboratory head Garbe-Schönberg started looking for an alternative, accurate analytical method which did not require wet chemistry. The start-up team improved their method over several semesters, followed by the patent registration last year. "There is already great interest from science and industry, especially internationally. This has encouraged us to manufacture our pellets for sale," said 28-year-old Christina Wittke, who completes the team as the marketing management specialist.

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Geoscientist Simon Nordstad (left), marketing management specialist Christina Wittke and materials scientist Leewe Schöneberg want to start their own company with their manufacturing process for reference materials.
Photo: Julia Siekmann / Kiel University

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The start-up team from Kiel University aims to set new standards for analysing the chemical composition of rocks and materials.

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The team from Kiel University grinds up samples of rocks and other materials to nano-sized particles, such as iron ore shown here. Pressed into pellets, they can be used as reference materials for precise calibration of measuring devices.
Photo: Simon Nordstad / Kiel University

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Support from nationwide funding programme

Thanks to the EXIST Business Start-up Grant amounting to 120,000 Euros, the team was able to build up the required know-how and infrastructure for their start-up project. The nationwide funding programme from the Federal Ministry for Economic Affairs and Energy and the European Union, supports the realisation of start-up ideas from science. "The EXIST grant enables the transfer of scientific findings from excellent research into marketable solutions, which also benefits the whole of society," said Dr Anke Rasmus. As head of the Zentrum für Entrepreneurship (Centre for Entrepreneurship, ZfE) at Kiel University, she advises the team on applications for funding and in all start-up-related matters. "As the ZfE, we want our services to help put knowledge from the university into practice even better."

More information:
EXIST Business Start-up Grant from the Federal Ministry for Economic Affairs and Energy
Start-up project My Standards:
Zentrum für Entrepreneurship (Centre for Entrepreneurship, ZfE):
Institute of Geosciences:

Christina Wittke
EXIST Project “µ-standards”
Institute of Geosciences
Tel.: 0431/880 37 89
Mobil: 0176/63720234

Kiel University
Press, Communication and Marketing, Dr. Boris Pawlowski
Address: D-24098 Kiel, phone: +49 (0431) 880-2104, fax: +49 (0431) 880-1355
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Text / Redaktion: ► Julia Siekmann