Jan Theodoor Gerard Overbeek (Groningen, January 30, 1911 – February 19, 2007) was a Dutch professor of physical chemistry at the Utrecht University.
Overbeek was born in Groningen. Overbeek's family moved to Rotterdam in 1913 and to Breda in 1925. Overbeek went to study chemistry (from 1928-1933) at the Utrecht University. He spent a year in military service and then worked for two years in Belgium. First year he worked with Jacques Errera at the Université libre de Bruxelles, after that a year with Arend Joan Rutgers at Ghent University.
He received his doctorate on May 19, 1941 with a thesis Theory of Electrophoresis, the Relaxation Effect (Theorie der electrophorese: het relaxatie-effect). All the characteristic features of the later work of Overbeek were present already in his thesis: formation of a simple model with the available data, set up the corresponding equations and then rigorous mathematical elaboration. Overbeek's dissertation explored the role of the deformation of the electrical double layer surrounding a charged colloidal particle which was set in motion by an external electric field.
After graduation Overbeek joined Philips, where Evert Verwey, was his immediate boss. In addition to work on luminescent screens they worked together on the interaction between colloidal particles. Attraction, based on the summation of the London - van der Waals interactions between the atoms was established in 1937 by Hamaker who also worked at Philips. However, the details on the repulsion produced by the electric double layer around colloidal particles were not so clear. By using thermodynamic considerations, the relevant free energies were calculated and interaction potential were derived. This research resulted in a seminal work Theory of the Stability of Lyophobic Colloids. The work had a great influence, and is still used by considerations about the stability of colloids, but also in various other fields where charged surfaces interact with each other. The whole of that theory is now known as DLVO (Derjaguin, Landau, Verwey, Overbeek) theory.
In 1946, Overbeek became a professor of physical chemistry at the Utrecht University. He picked up a wide range of problems which, despite their different forms, always had the same distinctive approach. For Overbeek method was simple, theoretical model, selected experiments, rigorous calculations and testing the model with experimental sets.
Overbeek also remained active after his retirement in 1981. His passion at that time was the understanding of the phenomenon of micro-emulsions, which were more stable in comparison to the conventional macro-emulsions. For his pioneering work Overbeek received several prestigious awards. He received honorary degrees from Clarkson University and University of Bristol. In 1989 he received the Wolfgang Ostwald Prize. He received honorary memberships of the Royal Netherlands Chemical Society. He was elected a member of the Royal Netherlands Academy of Arts and Sciences in 1953.Every year European Colloid and Interface Society awards Overbeek Gold Medal, which is a prize named after Theodoor Overbeek. "The Overbeek Gold Medal honours leadership and scientific excellence in the field of colloid and interface science over an entire career." The first prize in 2005 was handed over to Overbeek himself.
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Some of their strengths
Theodoor Overbeek has many admirable traits.
Based on spiritual traditions from around the world, they are someone who can be described as Altruistic, Loyal, Optimistic, Creative, Kind, Imaginative, and Energetic.
Smart and Hardworking
According to Mysticism’s Astrology tradition, Theodoor Overbeek is someone who is a smart, hardworking, reliable, and loyal person, who is detail-oriented and orderly, but also generous and optimistic. A person who looks for jobs that tend to reflect their identity.
Adaptable and Versatile
Based on Daoism’s Ba-Zi or ‘Chinese Zodiac’ tradition, people who know Theodoor Overbeek well know them as someone who can be adaptable, flexible, and polite, like a flower or a sapling.
Ambitious and Forceful
According to Hinduism’s Jyotisha or ‘Vedic Astrology’ tradition, many would also describe Theodoor Overbeek as someone who is ambitious, hard-working, determined, and intelligent.
A person who has a knack for identifying opportunities, has amazing concentration and focus, who can work independently, who likes starting new things, and who is somewhat of an intellectual.
Vigorous and Friendly
Based on the Mayan Tzolk’in or ‘Mayan Astrology’ tradition, Theodoor Overbeek is someone who has a vigor and energy that applies itself to all life's activities and endeavors, and a knack for forming family-like structures, groups, and communities.
They are also someone who is balanced, organized, and in-charge, and who loves traveling, working hard, and figuring out the patterns of things.
Patient and Perseverent
According to Judaism’s Kabbalah tradition, Theodoor Overbeek tends to be someone who is patient, faithful, hardworking and persistent, and who wants to achieve a lot in life. Who tends to be rather private when it comes to expressing feelings, enjoys being independent and self-sufficient, and who is not afraid of any obstacle.
Some of Theodoor Overbeek's challenges
While Theodoor Overbeek has many strengths, nobody is perfect. They also have some challenging traits they need to manage.
For example, Theodoor Overbeek can be Stubborn, Impulsive, Suspicious, Indecisive, Unrealistic, Careless, and Relentless.
Suspicious and Stubborn
One of Theodoor Overbeek's key challenges is that they are someone who can be suspicious and stubborn.
Relentless and Inflexible
Theodoor Overbeek is someone who can be relentless, obsessive, and inflexible, who can be confrontational with work colleagues, can have difficulty communicating feelings and be somewhat reclusive, and who can be self-destructive, overindulgent, and extravagant.
Callous and Stubborn
Finally, Theodoor Overbeek also can come across as cold and unemotional, be too dismissive of others' opinions, and be overly suspicious, selfish and crafty.
