Wolfgang Peukert

Friedrich-Alexander-Universität Erlangen-Nürnberg

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Jochen Schmidt

Friedrich-Alexander-Universität Erlangen-Nürnberg

Johannes Walter

Friedrich-Alexander-Universität Erlangen-Nürnberg

Doris Segets

University of Duisburg-Essen

Erdmann Spiecker

Friedrich-Alexander-Universität Erlangen-Nürnberg

Cornelia Damm

Friedrich-Alexander-Universität Erlangen-Nürnberg

Stefan Romeis

Friedrich-Alexander-Universität Erlangen-Nürnberg

Monica Distaso

Friedrich-Alexander-Universität Erlangen-Nürnberg

Karl‐Ernst Wirth

Friedrich-Alexander-Universität Erlangen-Nürnberg

Maximilian J. Uttinger

Friedrich-Alexander-Universität Erlangen-Nürnberg

Dirk M. Guldi

Friedrich-Alexander-Universität Erlangen-Nürnberg

Cooperative Institutions

Friedrich-Alexander-Universität Erlangen-Nürnberg

616

Technical University of Munich

Institute of Particle Physics

Universitätsklinikum Erlangen

Karlsruhe Institute of Technology

Centre National de la Recherche Scientifique

Bayer (Germany)

Max Planck Society

Forschungszentrum Jülich

Heidelberg University

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Enhancement of polyamide laser sinter powder reusability by acid catalyzed hydrolysis

Procedia CIRP (2020)

Nicolas Hesse Wolfgang Peukert Jochen Schmidt

This contribution introduces a method to reverse the deterioration in melt rheological behaviour ('ageing') of polyamide 12 that has previously been used in powder bed fusion processing by reduction of the polymers molecular weight via acid catalysed hydrolysis. Chosen hydrolysis conditions allow for a reconditioning below melting temperature and therefore leave the particulate nature of the powder intact while significantly improving the polymers rheological properties. The influences of different temperatures, acids and pH-values are investigated and the processability of recycled powders is assessed by melt rheological, optical and thermal characteristics.

Reusability

10.1016/j.procir.2020.09.021

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Citations (4)

Increasing flowability and bulk density of PE-HD powders by a dry particle coating process and impact on LBM processes

Rapid Prototyping Journal (2015)

Christina Blümel Marius Sachs Tobias Laumer Bettina Winzer Jochen Schmidt

Purpose – The purpose of this paper is to demonstrate the processability of cohesive PE-HD particles in laser beam melting processes (LBM) of polymers. Furthermore, we present a characterization method for polymer particles, which can predict the quality of the powder deposition via LBM processes. Design/methodology/approach – This study focuses on the application of dry particle coating processes to increase flowability and bulk density of PE-HD particles. Both has been measured and afterwards validated via powder deposition of PE-HD particles in a LBM machine. Findings – For efficient coating in a dry particle coating process, the PE-HD particles and the attached nanoparticles need to show similar surface chemistry, i.e. both need to behave either hydrophobic or hydrophilic. It is demonstrated that dry particle coating is appropriate to enhance flowability and bulk density of PE-HD particles and hence considerably improves LBM processes and the resulting product quality. Originality/value – At present, in LBM processes mainly polyamide (PA), 12 particles are used, which are so far quite expensive in comparison to, for example, PE-HD particles. This work provides a unique and versatile method for nanoparticulate surface modification which may be applied to a wide variety of materials. After the coating, the particles are applicable for the LBM process. Our results provide a correlation between flowability and bulk density and the resulting product quality.

Particle (ecology)

Deposition

Surface Modification

Particle density

10.1108/rpj-07-2013-0074

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Citations (55)

Determination of quantitative structure-property and structure-process relationships for graphene production in water

Nano Research (2015)

Thomas J. Nacken Cornelia Damm Haichen Xing Andreas Rüger Wolfgang Peukert

10.1007/s12274-014-0694-6

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Citations (17)

Analyse der Stabilisierungsmechanismen in Doppelemulsionen

Chemie Ingenieur Technik (2020)

S. Nachtigall Christian Holtze A. Laurenzis Stephan Bachmann F. Runge

10.1002/cite.202055149

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Polarized Raman scattering and SEM combined full characterization of self-assembled nematic thin films

Nanoscale (2016)

Rubitha Srikantharajah Klaus Gerstner Stefan Romeis Wolfgang Peukert

Elongated particles are predestined for a fast transfer of optical and electronical signals in a preferred direction, which is mandatory for a quick response in optoelectronic devices. The performance of the material is based on the quality of defect less alignment of the particles. On this account we present an easy non-invasive methodology for characterization of both surface and bulk order. The characterization of bulk order is performed by orientation dependent variation of the polarized Raman scattering signal on large areas by mapping. Scanning electron microscopy and image analysis on the surface complete the characterization. New insights in dip coated nematic structures clearly show the interplay of evaporation induced and shear-induced self-assembly and reveal a comprehensive mechanistic picture for nanorod assembly: the shear force dominated regime orients the particle in direction of withdrawal. At low withdrawal velocity, however, shear forces and evaporation counteract to produce a three-layered film where the top and bottom layers are oriented perpendicular to each other. The middle layer gives a clear evidence for a reorientation by convective flow.

Characterization

Nanorod

Particle (ecology)

10.1039/c6nr01440b

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Citations (7)

Die Versorgung der Städte mit Elektrizität : Vortrag, gehalten in der Vereinssitzung am 9. März 1897 / von W. Peukert. - (Architekten- und Ingenieur-Verein für das Herzogthum Braunschweig ; 1896/97)

Wolfgang Peukert

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Simulation of structure and mobility of aggregates formed by simultaneous coagulation, sintering and surface growth

Journal of Aerosol Science (2009)

Belal Al Zaitone Hans‐Joachim Schmid Wolfgang Peukert

Radius of gyration

Agglomerate

Dimensionless quantity

Gyration

Particle (ecology)

Shape factor

10.1016/j.jaerosci.2009.08.007

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Citations (35)

The low Reynolds number turbulent flow and mixing in a confined impinging jet reactor

International Journal of Heat and Fluid Flow (2007)

Florian Schwertfirm Johannes Gradl Hans C. Schwarzer Wolfgang Peukert Michael Manhart

10.1016/j.ijheatfluidflow.2007.04.019

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Citations (43)

Stabilization of carbon black particles with Cetyltrimethylammoniumbromide in aqueous media

Powder Technology (2013)

Claudia Eisermann Cornelia Damm Bettina Winzer Wolfgang Peukert

Thermogravimetric analysis

DLVO theory

Zeta potential

Carbon fibers

Attenuated total reflection

10.1016/j.powtec.2013.11.051

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Citations (28)

Surface Modification of ZnO Nanorods with Hamilton Receptors

International Journal of Molecular Sciences (2015)

Lukas Zeininger Martin Klaumünzer Wolfgang Peukert Andreas Hirsch

A new prototype of a Hamilton receptor suitable for the functionalization of inorganic nanoparticles was synthesized and characterized. The hydrogen bonding receptor was coupled to a catechol moiety, which served as anchor group for the functionalization of metal oxides, in particular zinc oxide. Synthesized zinc oxide nanorods [ZnO] were used for surface functionalization. The wet-chemical functionalization procedure towards monolayer-grafted particles [ZnO-HR] is described and a detailed characterization study is presented. In addition, the detection of specific cyanurate molecules is demonstrated. The hybrid structures [ZnO-HR-CA] were stable towards agglomeration and exhibited enhanced dispersability in apolar solvents. This observation, in combination with several spectroscopic experiments gave evidence of the highly directional supramolecular recognition at the surface of nanoparticles.

Surface Modification

Nanorod

Moiety

Catechol

10.3390/ijms16048186

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Citations (7)