Konstantinos Chatzipanagis

JRC GEEL - EUROPEAN COMMISSION · Directorate F - Health Consumers and Reference Materials

This work explores the mechanisms underlying the crystallization of citrate-functionalized amorphous calcium phosphate (cit-ACP) in two relevant media, combining in situ and ex situ characterization techniques. Results demonstrate that citrate desorption from cit-ACP triggers the surface-mediated transformation to nanocrystalline apatite (Ap). Our...

Statement of significance: Collagen and apatite are the main constituents regulating the mechanical properties of bone. Hence, an improved understanding of the impact of mineralization on these properties is of large interest for the scientific community. This paper presents systematic studies of synthetic collagen microfibers with increasing apat...

Metal ions are frequently incorporated into crystalline materials to improve their electrochemical properties and to confer new physicochemical properties. Naturally-occurring phosphate apatite, which is formed geologically and in biomineralization processes, has extensive potential applications and is therefore an attractive functional material. I...

CaSO4 minerals (i.e. gypsum, anhydrite and bassanite) are widespread in natural and industrial environments. During the last several years, a number of studies have revealed that nucleation in the CaSO4-H2O system is non-classical, where the formation of crystalline phases involves several steps. Based on these recent insights we have formulated a...

Ion-conducting lithium borotellurite glasses of composition (Li 2 O) y-[(2TeO 2) x-(B 2 O 3) 1-x ] 1-y (y = 0.33 and 0.40 and 0 ≤ x ≤ 1) were investigated by Raman and infrared (IR) techniques. The Raman spectra demonstrated the transition from TeO 4 trigonal bipyramid (tbp's) units to TeO 3 trigonal pyramids (tp's) with terminal oxygens upon incre...

Increasing demand for size-resolved identification and quantification of microplastic particles in drinking water and environmental samples requires the adequate validation of methods and techniques that can be used for this purpose. In turn, the feasibility of such validation depends on the existence of suitable certified reference materials (CRM)...

A spectroscopic investigation of beeswax adulteration by paraffin and/or stearic acid was undertaken via Attenuated Total Reflectance Infra-Red spectroscopy (ATR-IR) combined with multivariate statistical analyses. Principal Component Analysis (PCA) was successfully applied for the first time as an exploratory tool for the differentiation among pur...

A multi-spectroscopic investigation of glasses xPbO-(100-x)B2O3, where 30 ≤ x ≤ 80, was undertaken employing Raman, ²⁰⁷Pb static NMR, and ¹¹B MAS NMR spectroscopies. The Raman results were quantified and combined with quantitative NMR results to produce a coherent structural model. The fraction of four-coordinated borons (N4) has a maximum near x =...

Alkali germanotellurite glasses of composition 0.3M2O-0.7[(1-x)GeO2-xTeO2], M=Li, Na and 0≤x≤1, were investigated by Raman and infrared vibrational spectroscopic techniques to search for the origins of the alkali ion-dependent network former mixing (NFM) effect in these ion-conducting glasses. The vibrational spectra measured on mixed network-forme...

Tellurite glasses are widely used in technological applications such as optical recording media and optical switching devices due to their high refractive index, good infrared transmittance and high dielectric constant [1]. In a similar manner, lithium borate glasses exhibit fast ionic conductivity which makes them prominent candidates for the desi...

We report the design, fabrication and application of a novel micro-electromechanical device coupled to a confocal Raman microscope that enables in situ molecular investigations of micro-fibers under uniaxial tensile load. This device allows for the study of fibers with diameters in the range between 1 and 100 µm and lengths of several micrometers b...

Ancient trace residues left on stone artefacts by people represent a source of potentially fruitful data about diet, technology, and behaviour, but their investigation is not problem-free. Rather, correct identification of degraded residues and determination of their natural or anthropogenic origin remains at the heart of current methodological dev...

The Cover Feature shows how sun, seawater, and waste aluminium can be combined to enable the electrochemical mineralisation of carbon dioxide. More information can be found in the Full Paper by Lamb, Dowsett, et al.

An electrochemical cell comprising a novel dual-component graphite and Earth-crust abundant metal anode, a hydrogen producing cathode and an aqueous sodium chloride electrolyte has been constructed and used for carbon dioxide mineralisation. Under an atmosphere of 5% carbon dioxide in nitrogen, the cell exhibited both capacitive and oxidative elect...

An electrochemical cell comprising a novel dual-component graphite and Earth-crust abundant metal anode, a hydrogen producing cathode and an aqueous sodium chloride electrolyte has been constructed and used for carbon dioxide mineralisation. Under an atmosphere of 5% carbon dioxide in nitrogen, the cell exhibited both capacitive and oxidative elect...

We report the design, fabrication and application of a novel micro-electromechanical device coupled to a confocal Raman microscope that enables in situ molecular investigations of micro-fibers under uniaxial tensile load. This device allows for the study of fibers with diameters in the range between 10 and 100 µm and lengths of several hundred of m...

In 2015 an engraved shale pendant was found during excavations at the Early Mesolithic site of Star Carr, UK. Engraved motifs on Mesolithic pendants are extremely rare, with the exception of amber pendants from southern Scandinavia. The artwork on the pendant is the earliest known Mesolithic art in Britain; the 'barbed line' motif is comparable to...