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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

Mellon Foundation awards R10 million research grant to Trauma, Forgiveness and Reconciliation Studies
2015-02-20

Prof Pumla Gobodo-Madikizela, Senior Research Professor in Trauma, Forgiveness and Reconciliation Studies, and Dr Saleem Badat, Programme Director at the Mellon Foundation.
Photo: Johan Roux

Through her profound insight, vast experience, and unfaltering belief in humanity, Prof Pumla Gobodo-Madikizela, has secured a R10 million grant from one of the world’s most prestigious foundations funding human sciences research.

“This is one of the biggest grants that the Andrew W. Mellon Foundation has awarded to a university”, said Dr Saleem Badat, Program Director: International Higher Education and Strategic Projects at the Mellon Foundation. Prof Badat attended the press event that took place on 16 February 2015 on our Bloemfontein Campus.

UFS Trauma, Forgiveness, and Reconciliation Studies, spearheaded by Prof Gobodo-Madikizela, will manage the research project.

Prof Jonathan Jansen, Vice-Chancellor and Rector of the UFS, expressed great excitement “about this particular grant and the subject on which it focuses is so incredibly timely and germane to our own situation.”

Trauma, Memory and Representations of the Past: Transforming Scholarship in the Humanities and Arts

This new-found partnership between the Mellon Foundation and the UFS will enable a five-year research programme. The focus area of this initiative will be ‘Trauma, Memory and Representations of the Past: Transforming Scholarship in the Humanities and Arts’.

The research will pivot specifically around the question of how trauma is transmitted from one generation to the next. “South Africa lends itself to these questions,” Prof Gobodo-Madikizela said, “because we are now dealing with a generation of young people who were born after the traumas of the past.” These past experiences, though, are “passed on to the younger generation and become their own stories and narratives as if they themselves experienced the traumas directly.”

“This is an investment in how we can in fact create a different kind of community,” Prof Jansen said, “in which we eventually recognise each other – not by the accident of our skin, but by that elusive sense of a common humanity.”

Arts and theatre

Other aspects critical to this study are the inclusion of the arts and theatre. Many people have great difficulty in expressing their experiences of trauma in the spoken word. The arts and theatre provide an ideal platform to engage the public and stimulate conversation. As an example of the power these platforms possess, Prof Gobodo-Madikizela highlighted the success of the Johannes Stegmann Art Gallery – situated on the Bloemfontein Campus and curated by Angela de Jesus – in engaging the public in very productive ways.

Participants

Some of the artists, directors and scholars who will join in this project include:

• Lara Foot-Newton, Director/Playwright
• Sue Williamson, Activist Artist
• Angela de Jesus, Visual Artist/Curator
• Dr Buhle Zuma, Social Psychology Research
• Dr Shose Khessi, Social Psychology Research
• Prof Tamara Shefer, Women’s and Gender Studies
• Prof Kopano Ratele, Gender/Men and Masculinities
• Prof Jan Coetzee, Sociology of Developing Societies
• Prof Helene Strauss, Literary and Cultural Studies

New intellectual frontiers

“There is an aspiration in this proposal,” Dr Saleem Badat said. “We were born through this pain of colonialism and apartheid; we even went through the TRC. Our scholars in this country, our universities, should be at the forefront of this research. This is not research we can leave to the institutions in the north.”

Prof Gobodo-Madikizela agreed. “The overarching theme of this work is new knowledge production, focusing on the experiences in South Africa as experiences that can teach us something new.”

This will serve not only South Africa, but can also establish support for, and inform, countries facing similar dilemmas. In fact, “any part of the world in which genocide and murder and racism remains as legacies from the past,” Dr Badat said.

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