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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

A learning path for working adults
2009-02-09

 
From the left are: Ms Maquida du Preez (MDP Programme Manager), Ms Eliche Lorandi ( Marketing Executive), Mr Theo Potgieter (BEE and Transformation Manager), Ms Marie Griebenouw (Programme Manager) and Mr Danie Jacobs (Head: Centre fro Business Dynamics).
Photo: Mangaliso Radebe
 
 In the short space of five years, the Centre for Business Dynamics at the University of the Free State (UFS) has grown in stature to such an extent that it is currently offering leadership development programmes at 45 institutions all over the country.

Speaking at the fifth anniversary of the centre’s establishment, its director, Mr Danie Jacobs, said the centre was the first commercial unit in South Africa, attached to a business school, to establish a desk focusing on Black Economic Empowerment (BEE) and Transformation in association with Empowerdex.

The main purpose of this joint venture with Empowerdex is to deliver comprehensive BEE training through the development and presentation of various programmes.

The centre has also introduced the High-Performing Directors’ Programme in association with ABSA. A total of about 40 students have enrolled for this programme so far,and their numbers fluctuate every year.

It is also the first unit in the country to link up with Thinking Fusion, one of the three consultancies contracted by the UFS, to introduce two unique leadership programmes, namely a programme in Creating Leadership and Personal Capacity in Women and the Leadership in the Connection Economy programme.

“Our aim is to prepare women for full participation as managers and leaders in transforming organizations to become truly integrated and representative of the full diversity spectrum of South Africa,” Mr Jacobs said.

“We have built amazing relationships with various clients, both in the private and public sector, over the last five years,” said Mr Jacobs. “I believe the success of the Centre for Business Dynamics lies within our methodology of action learning, as well as creating a learning path for working adults.”

“Because of our country’s history not all people are on an equal footing when it comes to prior learning, so we level the playing field by breaking the training up into easily absorbable components. The centre can address the training needs of any company because of the multiple resources that we are fortunate enough to have at our fingertips,” he said.

The centre also offers a Postgraduate Diploma in Tax Strategy and Management, aimed at bringing all parties involved in the field of taxation up to date with the latest developments and changes.

In addition, the centre has introduced The Choice and The Choice at Work programme in association with the Arbinger Institute in the United States of America. There are also two management programmes, namely the Management Preparation Programme and the Management Development Programme.

Apart from these programmes, the centre also offers products and services such as short courses, workshops and consultations.

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt.stg@ufs.ac.za  
9 February 2009
 

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