Jörg Radnik

Correlative surface analysis across different information depths of covalently functionalized Graphene oxide and Black phosphorus

Jasmin Er, Chenyun Deng, Philip Nickl, Robert Schusterbauer et autres

Covalent functionalization of two-dimensional (2D) materials often produces layered structures where surface layers mask the underlying substrate for many surface-sensitive analytical techniques. However, it remains unclear how the measured signals obtained by surface-sensitive techniques of different information depths relate to the functional …

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Combining Small-Angle X-ray Scattering with Photoelectron Spectroscopy to Increase the Accuracy of Silica Shell Thickness Measurements on Inorganic Nanocrystals

Sarah‐Luise Abram, Anna Matiushkina, David J. H. Cant, Nicholas Engel et autres

Abstract X-ray photoelectron spectroscopy (XPS) is widely used to measure the surface chemistry of nanomaterials, yet it can also provide structural information. The thickness of surface passivation shells can be determined with XPS and hard X-ray photoelectron spectroscopy (HAXPES), but accuracy depends …

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Abiogenic iron oxidation at the olivine surface is required for fungal weathering

Ruben Gerrits, Jörg Radnik, Anna A. Gorbushina

While abiogenic Fe oxidation at the silicate surface controls abiotic dissolution kinetics, its influence on biotic dissolution remains unclear. To explore this relationship, we ran dissolution experiments with the rock-inhabiting fungus Knufia petricola and natural olivine (Fo91) or its Fe-free analogue, synthetic …

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Chemical Characterisation of Graphene‐Related Two‐Dimensional Materials: Summary of International Standard ISO/TS 23359

Charles A. Clifford, Dušan Lošić, Jörg Radnik, Lingling Ren et autres

ABSTRACT Standardised chemical characterisation methods for graphene‐related two‐dimensional materials (GR2Ms) are essential for achieving reproducibility, comparability and industrial uptake of GR2M measurements. Herein, we summarise the key elements of ISO/TS 23359 (Nanotechnologies—Chemical characterization of graphene‐related two‐dimensional materials from powders and liquid dispersions) …

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Physico-Chemical Characterization of Graphene-Related 2D Materials by Correlative Imaging – Possibilities and Limitations

Paul Mrkwitschka, Loay Madbouly, Robert Schusterbauer, Mario Sahre et autres

More and more applications based on graphene-related 2D materials (GR2M) are being developed and are entering the market. Accurate, detailed characterization of morphology, structure and chemistry of GR2M, especially as particulate matter, is a challenging task. Mostly, the morphological complexity of commercial …

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Mechanochemical Upcycling of Polyvinylidene Fluoride: Lewis Acid Induced Generation of Sodium Aluminium Fluorides

Minh Bui, Jakob Bölle, Jörg Radnik, Steffen M. Weidner et autres

A sustainable mechanochemical process for the generation of sodium aluminium fluorides by conversion of polyvinylidene fluoride (PVDF) waste on using ball milling in the presence of a Lewis acid was developed. The generated fluorides can be key materials for the aluminium production …

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A Pore or not a Pore? Understanding Pore Size Distributions of Non‐Graphitic Carbon and Atomically‐Dispersed M‐N‐C Materials

Simon W. J. Dietzmann, Asad Mehmood, Jian Liang Low, Shu‐Han Wu et autres

ABSTRACT Pore size analysis is essential for understanding and optimizing structure‐performance relations of functional carbon‐based materials including activated carbons, supercapacitor electrodes and atomically dispersed metal‐nitrogen‐doped carbon (M‐N‐C) catalysts. Pore size distribution (PSD) plots based on gas sorption porosimetry often show narrow micropores …

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Correlative Chemical Imaging to Reveal the Nature of Different Commercial Graphene Materials (Small Methods 9/2026)

Robert Schusterbauer, Paul Mrkwitschka, Mario Sahre, Elena Corrao et autres

Front Cover In article number e02344, Ievgen S. Donskyi, Vasile-Dan Hodoroaba, and co-workers present a straightforward correlative imaging approach for locating graphene flakes and impurities on the nanoscale within an ink as a highly complex matrix. A systematic comparison of different surface …

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Controlled Triazine‐Based Covalent Functionalization of Black Phosphorus for Degradable Hybrid Materials

Jasmin Er, Sreejita Ray, Enyu Xie, Robert Schusterbauer et autres

Controllable covalent surface functionalization of black phosphorus (BP) remains a central challenge in the development of 2D phosphorus-based materials. Here, we report a scalable route to synthesize biodegradable BP-polymer hybrids and establish optimal conditions for BP production, exfoliation, and covalent modification. BP …

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Operando Investigation of Mechanochemically Synthesized Ni‐Based Metal–Organic Frameworks for Electrocatalytic Alcohol Oxidation

Arkendu Roy, Xavier Vaneberck, Celia Ganado Rodriguez, Semen Butyrin et autres

A nickel‐based metal–organic framework (Ni‐MOF) with mixed N‐ and O‐donor linkers was synthesized via both mechanochemical and solvothermal routes and evaluated as an electrocatalyst for alcohol oxidation reactions (AORs). Despite having identical crystal and electronic structures, the mechanochemically synthesized Ni‐MOF (termed as …

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Defining graphene-related two-dimensional materials (GR2Ms) through international standardisation: Comment on “Revisiting the nomenclature for two-dimensional carbon materials”

Charles A. Clifford, Terrance Barkan, Scott Brown, Erlon Henrique Martins Ferreira et autres

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Standardized Elemental Composition Analysis of Graphene‐Related 2D Materials (GR2M) With SEM/EDS and XPS Works Reliably

Paul Mrkwitschka, Mario Sahre, Elena Corrao, F. Pellegrino et autres

Reliable quantification of the chemical composition of graphene-related 2D materials (GR2M) as powders and liquid suspensions is a challenging task. Analytical methods such as X-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectrometry (ICP-MS), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy …

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