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TED Talks about rainbows

18 April 2022 | Story Leonie Bolleurs | Photo Stephen Collett

“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 new dawn for student governance

2011-09-02

Our SRC presidents: Richard Chemaly (Bloemfontein Campus) and Bongani Ncgaca (Qwaqwa Campus)
Photo: Hannes Pieterse

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The successful and peaceful completion of the University of the Free State’s (UFS) Student Representative (SRC) elections 2011 herals a new dawn for student governance with the announcement of the results today (1 September 2011).

The SRC elections at the Qwaqwa Campus were completed on 25 August 2011, while the elections at our Bloemfontein Campus took place on 29 and 30 August 2011.

“A new dawn heralds a new day when Richard Chemaly, the son of Lebanese immigrants becomes President of an SRC, as elected by students from all racial backgrounds and from across the student body at large. A new day has arrived when candidates could have won voter support across racial lines; a new day is here when all SRC members are now recognised leaders on the basis of academic accountability,” the Dean of Student Affairs, Mr Rudi Buys, says.

A new dawn has arrived; firstly, insofar as student elections for the choice of student leaders at the UFS now proceed according to a non-racial and a non-party political basis.

Not only did the SRC elections at both the Bloemfontein and Qwaqwa Campuses achieve its required quorum, with 31% (4 729 votes) and 50% (2 112 votes) voter turnout, respectively, but the SRC elected by students at the Bloemfontein Campus is 55% black and 45% white, and 60% female and 40% male. The numbers of votes gained by successful candidates also indicate that voters from all racial backgrounds have voted for their candidates of choice.

Secondly, a new dawn has arrived insofar as student governance occupied by only some student groups claiming to speak on behalf of all students has made way for direct voting for candidates by the broad student body and the threefold increase of student governance structures on campus.

Not only did all students at our Bloemfontein and Qwaqwa Campuses (a total of 15 173 and 4 257, respectively) have the opportunity to participate in voting directly, but nine additional Student Councils were established at our Bloemfontein Campus that each holds an ex officio seat on the SRC and allows for student governance in all the major student sectors of the student body, such as for postgraduate students, international students and all categories of student associations.

The various councils now established include the Student Academic Affairs Council, the Student Associations Council, the Postgraduate Student Council, the International Student Council, the Student Media Council, the Residences Student Council, the Commuter Student Council and the Rag Community Service Fundraising and Service Councils. In addition, all faculties also introduced student representative structures at departmental and faculty level in 2011 to ensure student participation in faculty management and governance.

The SRC members at the Bloemfontein Campus are:

Elective portfolios:
President: Mr Richard Chemaly
Vice-President: Mr Lefata David Maklein
Secretary: Ms Matshepo Ramokgadi
Treasurer: Mr Werner Pretorius
Arts & Culture: Ms Alta Grobelaar
Accessibility & Student Support: Mr William Clayton
First-generation Students: Ms Petre du Plessis
Media, Marketing & Liaison: Ms Biejanka Calitz
Sport: Mr Bonolo Thebe
Student Development & Environmental Affairs: Ms Busisiwe Madikizela
Transformation: Ms Qaqamba Mhlauli

Ex officio portfolios:
Dialogue & Ex officio: Associations Student Council: Mr Anesu Ruswa
Academic Affairs & Ex officio: Academic Affairs Student Council: Mr Jean Vermaas
Residence Affairs & Ex officio: Campus Residences Student Council: Ms Mpho Mokaleng
City student Affairs & Ex officio: Commuter Student Council: Ms Annemieke Plekker
Postgraduate Affairs & Ex officio: Postgraduate Student Council: Ms Glancina Mokone
International Affairs & Ex officio: International Student Council: Mr Pitso Ramokoatsi
Student Media Affairs & Ex officio: Student Media Council: Ms Nicole Heyns
RAG Community Service & Ex officio: RAG Fundraising Council: Ms Iselma Parker
RAG Community Service & Ex officio: RAG Community Service Council: Ms Motheo Pooe

In the Qwaqwa elections, SASCO achieved 36,84% of the vote, with SADESMO, PASMA and NASMO each achieving 29,73% and 18,56% and 12,74%, respectively .

Mr Bongani Ncgaca was elected as the President of the SRC at our Qwaqwa Campus, while the names of the SRC members at the campus will be announced on 7 September 2011.

The Central SRC will be established on 8 September 2011 by a joint sitting of the two SRCs.

The successful completion of the SRC elections at the Bloemfontein Campus follows a yearlong review process of student governance by a Broad Student Transformation Forum (BSTF) that consists of 59 delegations from student organisations and residences. The BSTF adopted independent candidacy for elective portfolios and additional student councils to provide ex officio seats on the SRC as the template for student governance, following the consideration of a series of benchmarking reports on student governance nationally and internationally.

The UFS Council adopted the new SRC Constitution, as drafted and submitted by the BSTF, on 3 June 2011.

Media Release
1 September 2011
Issued by: Lacea Loader
Director: Strategic Communication
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: news@ufs.ac.za

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