Frank Heberling

Frank Heberling
Karlsruhe Institute of Technology | KIT · Institute for Nuclear Waste Disposal (INE)

Dr. rer. nat., Dipl.-Geoökol.

About

57
Publications
12,191
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1,152
Citations
Citations since 2017
29 Research Items
871 Citations
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2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
Introduction
Frank Heberling currently works at the Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology. Frank does research in Geochemistry. His current research is related to solid-solution formation, mineral recrystallization, and mineral surface reactions.
Additional affiliations
January 2010 - present
Karlsruhe Institute of Technology
Position
  • Researcher

Publications

Publications (57)
Article
Magnetite (Fe(III)2Fe(II)O4) nanoparticles are fascinating nanoparticulate minerals for their electronic, magnetic and chemical properties. Ubiquitous, in the environment, they are also among the most used ferromagnetic nanomaterials in environmental, industrial and biomedical applications. Their intriguing structural and reactivity features do not...
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The concentrations of magnesium (Mg) and calcium (Ca) in natural aqueous environments are controlled by sorption and dissolution–precipitation reactions. Ca binding in calcareous soils depends on the degree of solution saturation with respect to CaCO3. Mg may be bound in precipitating calcite. Here, we investigated Mg incorporation into calcite via...
Article
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Carbon steel is a potential canister material for the disposal of high-level radioactive waste in deep geological repositories in clays and clay rocks. Bentonite is considered as a potential backfill material for those multi-barrier systems. To predict the long-term performance and for safety assessment the knowledge of canister corrosion behavior...
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The interdisciplinary project “Integrity of nuclear waste repository systems – Cross-scale system understanding and analysis (iCROSS)” combines research competencies of Helmholtz scientists related to the topics of nuclear, geosciences, biosciences and environmental simulations in collaborations overarching the research fields energy and earth and...
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Selenium contamination of air, aquatic environments, soils and sediments is a serious environmental concern of increasing importance. Selenium has a paradoxical feature in bringing about health benefits under the prescribed level, but only a few fold increase in its concentration causes deleterious effects to flora and fauna, humans and the environ...
Article
Magnetite nanoparticles, commonly found in subsurface environments, are extensively used in various applications such as environmental remediation, catalysis, electronics and medicine. However, the oxidative transformation of magnetite (mixed-valent Fe-oxide) into maghemite (Fe(III)-oxide) that drastically affects magnetic, catalytic and redox prop...
Article
Surface chemistry of mineral phases in aqueous environments generates the electrostatic forces involved in particle-particle interactions. However, few models directly take into account the influence of surface speciation and changes in solution speciation when the diffuse layer potential profiles of approaching particles overlap and affect each ot...
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The rheological properties of fresh cement paste are highly influenced by a large number of parameters, among which the most important factors are the applied shear stress, and the shear history, the age of the sample and the temperature. The effects of these parameters on the yield stress (designated as structural limit stress in this work), the v...
Article
An open question in predicting the rheological properties of cement suspensions has been whether changes of rheology during hydration are merely a result of shifts in the electrostatic interaction patterns of the particles over time, or whether and to which extent steric bridging by hydration products occurs. The latter could explain phenomena such...
Article
Batch experiments were performed to study adsorption and desorption of 75Se and 113Sn radiotracers at environmentally representative concentrations of ~0.3 ng L-1 and ~3 ng L-1, respectively. The radiotracers were incubated with wet bulk sediments from the Gironde Estuary and the Rhône River, combining freshwater and coastal seawater salinity (S =...
Article
Despite the long history of studies on (Ba,Ra)SO4, various recent investigations aimed at improving our understanding of its formation processes and thermodynamics. Accumulation of natural Ra isotopes (mainly ²²⁶Ra and ²²⁸Ra) in (Ba,Ra)SO4 plays an important role in many geotechnical applications and water desalination facilities. In the near field...
Article
Scale formation processes in the surface installations of geothermal power plants may have a negative effect on power plant performance. In addition, scales formed within the geothermal water circuit frequently accumulate natural radionuclides. Consequently, scale formation may lead to radiation dose rates, which are of radiological concern, and de...
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In this study, we report results of the analysis of a particularly interesting scaling sample from the geothermal plant in Neustadt-Glewe in northern Germany, which contained 19% Galena (PbS) and 81% of a heterogeneous assemblage of (Ba,Sr)SO4 crystals with varying compositions, 0.15 < XBa < 0.53. A main fraction of the sample (~56%) has a barite c...
Article
A wide range of isoelectric points (IEPs) has been reported in the literature for sapphire-c (α-alumina), also referred to as basal plane, (001) or (0001), single crystals. Interestingly, the available data suggest that the variation of IEPs is comparable to the range of IEPs encountered for particles, although single crystals should be much better...
Article
Selenium is a common pollutant in soils and aquifers. The radioisotope ⁷⁹Se, an abundant fission product of ²³⁵U, is of particular concern in the context of nuclear waste disposal safety due to its long half-life and its expected high mobility in the multi-barrier system around potential nuclear waste disposal sites. Oxidized selenium species are r...
Article
The three-dimensional structure of the barite (001)-water interface was studied using in situ specular and non-specular X-ray reflectivity (XR). Displacements of the barium and sulfate ions in the surface of a barite crystal and the interfacial water structure were defined in the analyses. The largest relaxations (0.13 Å lateral and 0.08 Å vertical...
Article
The geochemical behavior of selenium and strontium is critical for the safe disposal of radioactive wastes. Goethite as one of the most thermodynamically stable and commonly occurring natural iron oxy-hydroxides promisingly retains these elements. This work comprehensively studies the adsorption of Se(IV) and Sr(II) on goethite. Starting from elect...
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The potential to provide base-load electricity as well as industrial and domestic heat places geothermal energy in a unique position in the future energy mix. As estimated by the International Energy Agency, geothermal power can contribute to 3.5% to the worldwide power and 3.9% to heat production by 2050. This includes the development of Enhanced...
Article
Environmental- and Geoscientists working in different fields regard the reactivity of calcite and corresponding changes in its trace elemental- or isotopic composition from diametrically opposed points of view. As one extreme, calcite based environmental remediation strategies rely on the fast recrystallization of calcite and the concurrent uptake...
Article
Aqueous–solid solution (AQ-SS) processes have garnered increasing attention from geochemists and environmental engineers because they play major roles in the fate and transport of elements in Earth surface environments. The reasons for this interest include: (i) the primary crystallization of minerals from multicomponent aqueous solutions leads to...
Article
Adsorption of Rb+ on the (104) plane of single crystal calcite was investigated to estimate the charge of the ionic crystal calcite – water interface. The adsorbed Rb+ coverage was quantified as a function of Rb concentration (1 – 100 mM) in calcite-saturated solutions at pH 8.3 by using in-situ resonant anomalous X-ray reflectivity in transmission...
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The redox variations and changes in local atomic environment of uranium (U) interacted with the magnetite nanoparticles were studied in a proof of principle experiment by the U L3 and M4 edges high energy resolution X-ray absorption near edge structure (HR-XANES) technique. We designed and applied a mixed flow reactor (MFR) set-up to maintain dynam...
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Trivalent americium was adsorbed on magnetite and maghemite under similar chemical conditions and the local environment probed by EXAFS spectroscopy. In both samples, partially hydrated Am(III) binds the surface but slightly different surface complexes were identified. On Fe3O4, Am(III) forms monomeric tridentate surface complexes similar to that r...
Article
Zeta potential is a physicochemical parameter of particular importance in describing the surface electrical properties of charged porous media. However, the zeta potential of calcite is still poorly known because of the difficulty to interpret streaming potential experiments. The Helmholtz- Smoluchowski (HS) equation is widely used to estimate the...
Article
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We present a multidisciplinary study on the hematite (001) – aqueous solution interface, in particular the relationship between surface structure (studied via surface diffraction in the presence of a water film) and the macroscopic charging (studied via surface- and zeta-potential measurements in electrolyte solutions as a function of pH). Upon agi...
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We have studied the impact of dissolved aluminum on interfacial properties of two aluminum bearing minerals, corundum and kaolinite. The effect of intentionally adding dissolved aluminum on electrokinetic potential of basal plane surfaces of sapphire was studied by streaming potential measurements as a function of pH and was complemented by a secon...
Article
Surface reactions on calcite play an important role in geochemical and environmental systems, as well as many areas of industry. In this review, we present investigations of calcite that were performed in the frame of the joint research project “RECAWA”, (reactivity of calcite-water-interfaces: molecular process understanding for technical applicat...
Article
Selenium is an environmentally relevant trace element, while the radioisotope 79Se is of particular concern in the context of nuclear waste disposal safety. Oxidized selenium species are relatively soluble and show only weak adsorption at common mineral surfaces. However, a possible sorption mechanism for selenium in the geosphere is the structural...
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Calcite-water interface reactions are of major importance in various environmental settings as well as in industrial applications. Here we present resonant interface diffraction results on the calcite(104)-aqueous solution interface, measured in solutions containing either 10 mmol L(-1) RbCl or 0.5 mmol L(-1) Se(vi). Results indicate that Rb(+) ion...
Article
The surface potentials of a (0 0 1) terminated hematite crystal that was annealed at high-temperature were measured as a function of pH by means of the corresponding single crystal electrode. The surface potential at a given pH did not depend on the electrolyte concentration, and was found to exhibit an inflection point. The shape of the function i...
Article
h i g h l i g h t s Teflon in contact with aqueous solution behaves similar as other hydrophobic material. Water at the Teflon interface and in the bulk have different physical and chemical properties. The affinities of OH − and H + ions to the Teflon surface are not equal and depend on pH. The isoelectric point of Teflon is in the acidic pH region...
Article
Deposition of latex colloids on a structured silicon surface was investigated. The surface with well-defined roughness and topography pattern served as an analogue for rough mineral surfaces with half-pores in the submicrometer size. The silicon topography consists of a regular pit pattern (pit diameter = 400 nm, pit spacing = 400 nm, pit depth = 1...
Article
Neptunyl, Np(V)O(2)(+), along with the other actinyl ions U(VI)O(2)(2+) and Pu(V,VI)O(2)((+,2+)), is considered to be highly mobile in the geosphere, while interaction with mineral surfaces (inner- or outer-sphere adsorption, ion-exchange, and coprecipitation/structural incorporation) may retard its migration. Detailed information about the exact i...
Article
The zetapotential of calcite in contact with aqueous solutions of varying composition is determined for pre-equilibrated suspensions by means of electrophoretic measurements and for non-equilibrium solutions by means of streaming potential measurements. Carbonate and calcium are identified as charge determining ions. Studies of the equilibrium solu...
Article
Adhesion of colloidal particles to mineral and rock surfaces is important for environmental and technological processes. Surface topography variations of mineral and rock surfaces at the submicrometer scale may play a significant role in colloid retention in the environment. Here, we present colloid deposition data on calcite as a function of submi...
Article
In this experimental study a wide range of methods has been used to investigate processes leading to incorporation of neptunyl(V) (NpO2+) cations into the calcite structure following surface sorption and upon coprecipitation. As part of the investigation calcite surface properties were characterized over a wide range of pH and p(CO2) conditions usi...
Article
The migration behavior of the actinyl ions U(VI)O2(2+), Np(V)O2+ and Pu(V,VI)O2(+,2+) in the geosphere is to a large extend controlled by sorption reactions (inner- or outer-sphere adsorption, ion-exchange, coprecipitation/structural incorporation) with minerals. Here NpO2+ adsorption onto calcite is studied in batch type experiments over a wide ra...
Article
Coprecipitation experiments of Np(V) and U(VI) with calcite were performed in mixed-flow reactors under steady state conditions at room temperature for up to 400 h at precipitation rates of 1.0 x 10(-8) to 6.8 x 10(-8) mol/(m2 s). The saturation index with respect to calcite varied between 0.04 and 0.95. Initial Np(V) or U(VI) concentrations were 1...
Article
Full-text available
In this experimental work the calcite-water interface is characterized by means of zetapotential and surface diffraction measurements. Based on the experimental results a new Basic Stern Surface Complexation model for calcite is developed. Neptunyl(V) adsorption at the calcite surface and incorporation into the calcite structure is studied by batch...

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Projects (4)
Project
The rheological properties of fresh concrete are mainly determined by the properties of the cement paste contained therein, which generally exhibits pronounced non-Newtonian flow behaviour characterized by a yield stress and pronounced thixotropy. The intended model approach is characterized by two characteristics: It distinguishes between the contribution of the colloidal and non-colloidal inventory towards the rheology and allows thereby a distinctly improved definition of the effects such as temperature and hydration upon the decisive particle inventory (meaning the colloidal components). Furthermore, the model will be probabilistically formulated and account for both the heterogeneity of the cement stemming from the mineral phase composition, as well as resulting from agglomeration or shear banding.
Project
The project aims at significantly improved understanding of solution properties and the retention of mobile fission products (137Cs, 99Tc, 79Se, 129I) especially under reducing geochemical conditions. More reliable chemical input data (solubility limits, sorption coefficients, source terms) for long-term analytical model calculations for generic repository conditions of different host rock formations shall be generated within the project. This includes inventory, instant release fraction and chemical release form of the source term for 129Iodine as well as solubility limits and sorption coefficients for the elements Cs, Tc, Se, I. VESPA II started in September 2017 and will last for 3 years. Project Partners are: Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH (project coordination) Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (KIT-INE) Forschungszentrum Jülich, IEK-6: Nuclear Waste Management and Reactor Safety Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology (HZDR) With this collaboration, the different competences and capacities are pooled to reach the project goals. The project is supported by the German Federal Ministry of Economic Affairs and Energy under the contract numbers 02 E 11607A (GRS), 02 E 11607B (HZDR), 02 E 11607C (KIT-INE) and 02 E 11607D (FZJ-IEK-6). https://vespa2.grs.de/