SEPAWA Congress Nielinger Lena
Lena Nielinger

Technische Universität Dortmund

Student

Current lectures/posters

15.10.2025

12:30

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12:45

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Award Session: Young Scientist Award of the GDCh Division of Detergent Chemistry

(available in the SOFW media library after the congress)

Award ceremony and short presentation of the master’s thesis awardee.
– BSc: Lena Nielinger; Title of her thesis: “Investigating the Aggregation Properties of Ionic/Non-ionic Hybrid Detergents ”
– MSc: Moritz Stanek; Title of his thesis: “Physicochemical Characterization of Biosurfactants” – Lecture title: “Interfacial Properties and Aggregation behaviour of Mannosylerythritol Lipids and Mixtures with Anionic Surfactants”

80 | Investigating the Aggregation Properties of Ionic/Non-ionic Hybrid Detergents

Detergents belonging to different classes, such as ionic and non-ionic detergents, can exhibit strongly differing properties. To optimize detergent properties for a given application, ionic and non-ionic detergents are often non-covalently mixed. To understand how combining ionic and non-ionic detergent headgroups through a covalent bond influences detergent properties, I herein investigated ionic/non-ionic hybrid detergents regarding their critical micelle concentrations (cmc), encapsulation efficiency, hard water tolerance and antibacterial properties. To determine cmc values, I compared two dynamic light scattering approaches, i.e. concentration-dependant analysis of light scattering intensity and diffusion coefficients. My results reveal that the concentration-dependant diffusion coefficient analysis deliveres reproducible cmc values, while light scattering intensity analysis is unsuitable for this detergent class. Properties of ionic/non-ionic hybrid detergents depend on several structural features, including the charge of the ionic headgroup, size of the non-ionic headgroup and distance between ionic headgroup and non-polar tail. Overall, shielding the charge of an ionic headgroup with the help of a neighbouring non-ionic headgroup decreases cmc values, increases encapsulation efficiency and hard water tolerance, and reduces antibacterial properties. My results uncover that ionic/non-ionic hybrid detergents exhibit scalable properties and great potential to be used as nanocarriers in future applications.