Science, Energy and Building Services Prof. Dr. rer. nat. Stephan Appel

General chemistry

Physical chemistry

Surface- and nano chemistry

Recycling of lithium ion storage cells

• Head of laboratory for surface and nano chemistry; link to the labs: https://www.hs-esslingen.de/en/science-energy-and-building-services/research/laboratories/chemical-engineering
• Representative for schlarships for natural science programs
• Radiation safety officer

on appointment

1991-1996  Chemistry studies, Universität des Saarlandes, focus physical chemistry, Diploma thesis to crystal chemistry and theory of uranium tellurides

1996-2000  Scientific staff menber, Universität des Saarlandes: Inorganic synthesis chemistry, solid state chemistry, crystallography, Rb2Te, K2UTe3, U0,9Te3

2000  PhD thesis on the structural chemistry of alkali metal uranium chalcogene systems (https://archive.org/details/diss_appel_1/mode/2up)

2001  Post-Doc, DFG project Optokeramik, ceramic powder technology

2002-2014  Development of fluorescent lamps, Osram GmbH: coating development, surface chemistry, analytic of suspensions, colorimetry

Since 2014  Prof. at Hochschule Esslingen

see

https://scholar.google.de/citations?hl=de&user=c_TzmjcAAAAJ&view_op=list_works&sortby=pubdate

PhD thesis: (https://archive.org/details/diss_appel_1/mode/2up)

Characterization and reconditioning of cathode material from lithium ion accumulators

Surface modifications

Thermodynamics

See also https://www.researchgate.net/profile/Stephan-Appel

Laboratory equipment

• X-ray powder diffractometer, D2 Phaser, Bruker
• UV-VIS spectrometer, lambda 35, Perkin Elmer
• Contact angle measurement, dataphysics
• Zetapotential and streaming potential: Streaming current detector Stabino, Particle Metrics
• Zetapotential (LDA) + Particle size distribution (DLS), Zeta Sizer Nano ZS90, Malvern Panalytical
• Particle size distribution (PSD), Differential centrifugal sedimentation (DCS), Disc Centrifuge 2400UHR, CPS instruments
• Thermogravimetry and differential scanning calorimetry, TG/DSC Netzsch STA449
• Linear table, Physik Instrumente
• Rotor-stator dispersing stick, Ultraturrax T25, IKA
• Rotary evaporator, Heidolph
• Triplle roll mill, Exakt
• Steel autoklaves with PTFE insert, 220 °C, 300 bar, 2 x 70 ml, 1 x 300 ml, 1x 500 ml
• Chamber furnace, air, 1100 °C, Nabertherm
• Tube furnace, air, protective gases or oxygen, 1600 °C, Carbolite Gero
• 2 Ultrasonic baths: Bandelin Sonorex
• Centrifuge, 4 x 80 ml, 4000 rpm, Sigma 2-7
• Centrifuge, 8 x 12 ml, 5500 rpm , Z 230 A, Hermle