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18 April 2022 | Story Leonie Bolleurs | Photo Stephen Collett
Prof Ted Kroon
Prof Ted Kroon from the Department of Physics recently delivered his inaugural lecture on the topic What’s the use of a rainbow on the UFS Bloemfontein Campus.

“A rainbow is a natural phenomenon, the result of the refraction and reflection of the sun’s rays in drops of rain. As far as mankind is concerned, it’s a perfectly useless object and won’t make anyone money. Yet the poet who said, My heart leaps up when I behold a rainbow in the sky, only put into word the feeling of wonder and excitement we all have when we see a rainbow.”

“Every day I see a rainbow in my work; I do not need to wait to see one in the sky,” says Prof Ted Kroon, Professor in the Department of Physics at the University of the Free State (UFS), who used this phenomenon to introduce the topic of his inaugural lecture: What’s the use of a rainbow. 

“Far from being only a colourful spectacle with no practical value, rainbows are useful – and lead to useful things,” he believes. 

According to Prof Kroon, one can find examples of real rainbows and rainbow analogies used not only in everyday life, but also in physics. “Besides it being familiar devices in literature, culture, and even marketing, studies of rainbows can yield practical engineering information and may even help us to find new habitable planets,” he says.

Inspired by the many uses of a rainbow

In his lecture, he discussed the basic features of natural rainbows and how they come about. He also explored how the rainbow gives meaning to colour, and how this relates to the temperature of objects. He looked at an array of instances where the rainbow is used; from depicting the life of a star to indicating that we are sick (a thermometer) or when we need to refill a gas cylinder.
Moreover, Prof Kroon pointed out that rainbows are used in computer chips, stress identification, and to transmit internet data through underwater cables of glass fibre. He also referred to how the rainbow was harnessed as an engineering tool to measure refractive index and characterise fine droplet sprays used in industry. 

He continues, “Remarkably, the science developed to understand the natural rainbow can be redirected and applied to the optical properties of metallic nanoparticles, allowing the development of nanotechnology. Knowing how the natural rainbow works and its limitations, better systems have been developed to produce rainbows. Such rainbows have been used to discover new elements and to determine the age of the universe.”

As a member of an international community of phosphor researchers who are privileged to work with rainbows every day, he has used them to study the light-emitting properties of materials doped with bismuth. With this project – an initiative with the African Laser Centre taking place between 2016 and 2021 – he collaborated with the University of Khartoum in Sudan and trained a number of its postgraduate students. “My role included the guidance of students and the measurement and interpretation of the light-emitting properties of the materials. Our research during this time, considering more than a dozen materials, was summarised in 34 scientific publications that contributed to a greater understanding of bismuth ions as light-emitting materials,” he explains. 

Developing new materials, efficient in emitting blue light

He has been developing luminescent materials since 2006, primarily for general lighting (fluorescent tubes and LEDs) and displays (television, computer, and cellphone screens), as well as niche applications in medical and forensic science. 

As part of his current research, he is examining the effect of plasmonic metal nanoparticles on phosphor light emission. He is also exploring materials that absorb infrared light but emit visible light. “For this, I would like to consider the long-term stability of such materials and develop new materials that are more efficient in emitting particularly blue light,” he says. 

Prof Kroon holds a C2 rating from the National Research Foundation and has published more than 150 articles and book chapters, obtaining a Scopus h-index of 26.

News Archive

UFS welcomes two new deans in the faculties of Theology and Law
2014-08-04

 

The university council has approved the appointment of two deans: Prof Fanie Snyman, at the Faculty of Theology and Prof Caroline Nicholson, at the Faculty of Law.

Both professors offer the university a wealth of knowledge and experience in research and teaching.

Prof Fanie Snyman

Prof Snyman joined the university in 1984 as a senior lecturer in the Department Old Testament. His career followed a steadfast ascent which led him to attaining the title of professor and head of department the following year. On 1 July 2013, Prof Snyman took on the additional role of acting dean of the faculty.

As dean, he set out a clear vision of academic leadership with four primary focus areas: research, teaching and learning, internationalisation and regional engagement.

He is the author of eight books and contributed to seven internationally- and twelve nationally-published books. He has published nine articles in international journals and about 60 more in accredited journals.

Prof Snyman proposes to bring staff members together to extensively rethink and reposition the faculty in terms of identity, transformation and the way forward. “We live in a complex world, characterised by uncertainty and in constant change. This calls for complex but also innovative solutions,” he says.

Prof Caroline Nicholson

Prof Caroline Nicholson was born in Scotland and came to South Africa as a young child. She obtained her BProc and LLB degrees at the University of the Witwatersrand and completed her articles of clerkship at Chernin’s in Hyde Park Corner, Johannesburg. Prof Nicholson was admitted as both an attorney and notary public of the then Supreme Court of South Africa in 1986.

In 1986 she joined the University of South Africa (UNISA ) as a lecturer and remained there until 1999. During this time she completed an LLM in Banking Law and an LLD in Comparative Conflict of Laws – focusing on international parental child abduction. During the same year she moved to the Faculty of Law at the University of Pretoria where she worked for the last fifteen years. In 2003 she completed a Postgraduate Diploma in Alternative Dispute Resolution (ADR) and has an abiding interest in ADR, especially within the Family Law context.

Prof Nicholson has produced numerous articles and research presentations on a variety of legal subjects. Her primary areas of interest are, however, legal education and child law. She is known both nationally and internationally for her research contributions.

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