Welcome to the working group Gas Particle Systems (GPS)!



In the fields of research, teaching and innovation we deal on the one hand with the handling of gas particle systems and on the other hand with methods for the investigation, measurement and adjustment of material and functional particle properties.

The main issues of our current research are:

  • Gas cleaning with filtering and electrostatic separators
  • The behavior of reactive particle systems in separators
  • Further development of particle measurement technology in the context of smart filters
  • Adaptronic in the field of gas particle filter technology
  • Generation of droplets and their separation
  • Characterization, measurement and reduction of fine and ultrafine particulates

Applications of gas cleaning are found in energy technology (e.g. high temperatures), motor vehicle technology (high power density, durability) or in the separation of product aerosols (e.g. elevated concentrations). The panoply of investigations of functional particle characteristics aims for one at the development of catalysts and redispersibility of particle structures, but in particular also at new methods of real-time process control.

Our strategy combines explorative and fundamental research with user oriented technique development.


Bild Achim Dittler

31.05.2021 - ka-news

Achim Dittler spoke with ka-news about the study of the Charité Research Organisation (CRO) on the corona infection risk in different means of transport.

You can read the article here.

Bild Aerosole

21.04.2021 - There is something in the air

In his function as spokesman for the expert group on aerosols of the state government of Baden-Württemberg, Achim Dittler spoke with the weekly newspaper Kontext about aerosols. You can read the article here.

SWR Aktuell 15.4.2021

15.04.21 - Prof. Dittler at SWR Aktuell

Comment by Prof. Dittler on curfews. Probable means or nonsense?

Here you find the link to the contribution.


31.03.2021 - Television report on fine dust pollution from wood stoves on 3sat nano

In the 3sat nano broadcast of 31.3.2021 emissions from wood stoves were examined in an interdisciplinary way. Prof. Dittler contributed to the report with immission measurements.

Click here for the film.


24.03.2021 - Expert Group Aerosols of the State Government of Baden-Württemberg presents second report

The expert group on aerosols set up by the Baden-Württemberg state government, of which Achim Dittler is a member and spokesman, has submitted its second statement and makes recommendations on aerosols in vehicles, ventilation concepts in cultural facilities and virus mutations.

Here you can find the press release of the Ministry of Science, Research and the Arts Baden-Württemberg.



11.03.2021 - Filming for television

Prof. Dittler spoke with Markus Steinhausen today about respirable particulate matter pollution from wood-burning furnaces in residential areas

Posterpreis der ProcessNet-Fachgruppe Gasreinigung
Poster Award of the ProcessNet Expert Group "Gas Cleaning"

19.02.2021 - Poster Award of the ProcessNet Expert Group "Gas Cleaning"

We are pleased to announce that our contribution "Investigation of the penetration of soluble salts through surface filters using gravimetric and optical measurement methods" has been awarded this year's poster prize of the ProcessNet specialist group "Gas Cleaning".


08.02.2021 - Feature on FFP masks on 3sat

In the context of the 3sat contribution (link) we could show that permissible differences in the test standard EN149 can lead to different measuring results with the examination of so-called FFP masks. From the contribution it becomes clear: No mask offers 100% protection - not even an FFP2 mask. The use of higher-quality masks (i.e. OP mask, but especially FFP2 instead of "everyday mask") basically increases the effectiveness of the component in the overall concept. If "incorrectly worn" FFP2 masks "only" offer 50-60% overall separation efficiency due to "leakage ", this is always better than the separation efficiency of everyday masks (which is often less than 10%). Even if the effectiveness of the "mask" component is increased, the following still applies in addition: distance, reduce the number of people, reduce the duration of stay, ventilate & use indoor air filters if necessary.

Prof. Dittler in der Sendung SWR Aktuell
Prof. Dittler in the news program SWR Aktuell on 21.01.21

21.01.2021 - SWR Aktuell

We were allowed to support the TV report about masks in the 19:30h edition of today's Landesschau SWR Aktuell and could show how to wear a mask correctly and how to recognize this (from min 6:30).


21.01.2021 - Article in the Schwäbische Zeitung

In an article in the Schwäbische Zeitung on the topic of "School and daycare: How strongly do children actually spread the coronavirus?", Prof. Dittler emphasises the importance of adhering to a whole package of measures in order to be protected in the best possible way from potentially infectious aerosols when staying indoors.

Interview Prof. Dittler bei Baden-TV
Prof. Dittler as a guest on Baden-TV

18.01.2021 - Interview in Baden-TV-Aktuell

Prof. Dittler explained in an interview with BadenTV-Aktuell important aspects for the correct handling of aerosols in corona times.

Ventilation in a classroom

06.01.2021 - Feature on n-tv

For a report on n-tv on the topic "High-tech ventilation should make rooms usable again", Prof. Dittler reports on the effectiveness of room air cleaners.