Antonia Neels

Antonia Neels
Empa - Swiss Federal Laboratories for Materials Science and Technology | Empa · Department Materials meet Life

Prof Dr., Titular professor

About

406
Publications
33,217
Reads
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6,868
Citations
Additional affiliations
July 2014 - present
Empa - Swiss Federal Laboratories for Materials Science and Technology
Position
  • Head Center for X-ray Analytics
Description
  • Research and development of X-ray analytics for novel materials, components of / and systems for / with European research institutions and industries in materials science and biotechnology
August 2012 - present
École Polytechnique Fédérale de Lausanne
Position
  • Executive MBA in Management of Technology - MoT
Description
  • Student in the MoT until 2014.
April 2008 - June 2014
Centre Suisse d'Electronique et de Microtechnique
Position
  • Section Head of the XRD Application Lab and Microscopy
Education
September 1991 - August 1995
Université de Neuchâtel
Field of study
  • Physical Chemistry - Crystallography
September 1986 - August 1991
Humboldt-Universität zu Berlin
Field of study
  • Chemistry

Publications

Publications (406)
Article
Advanced methods such as high-resolution X-ray diffraction and X-ray micro CT allow highly precise determination of materials' residual stress, volume, and lattice defects. Their conjoint exploitation offers a powering tool to facilitate the industrial implementation of novelties in microfabrication. The wafer-level packaging represents a critical...
Article
Full-text available
Backgound: The composition of stones formed in the urinary tract plays an important role in their management over time. The most common imaging method for the non-invasive evaluation of urinary stones is radiography and computed tomography (CT). However, CT is not very sensitive, and cannot differentiate between all critical stone types. In this st...
Article
Metal‐Organic Framework Film In article number 2100871, Lars Lüder, Michael Calame, and coworkers present a metal organic‐framework film, which shows good electrical conductivity and basic chemiresistive response towards ambient environmental changes, originated by the interaction between the analytes and the metal organic‐framework when entering t...
Article
Full-text available
Nanoparticles (NPs) developments advance innovative biomedical applications. However, complex interactions and the low colloidal stability of NPs in biological media restrict their widespread utilization. The influence of NPs properties on the colloidal stability for gold NPs with 5 and 40 nm in diameter with two surface modifications, methoxy-poly...
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We have demonstrated the capability of laboratory propagation-based microtomography (miroCT) in non-destructive 3D virtual histopathology of human blood clots without any contrast agent. The volumetric information are valuable to understand the mechanical properties of clots which are crucial in selecting the most efficient mechanical thrombectomy...
Article
HR‐XRD Methods In article number 2100932, Neels and co‐workers reviewed important theoretical and practical aspects of HR‐XRD methods. In particular, they focused on nanowires, epitaxial layers, and complex sensor systems. Device fabrication processes affect the crystal lattice coherence, modify lattice strain and defects state, thus impacting on r...
Article
Electrospun nanofibers have shown great potential as drug vehicles and tissue engineering scaffolds. However, the successful encapsulation of multiple hydrophilic/hydrophobic therapeutic compounds is still challenging. Herein, sodium alginate/poly(ε-caprolactone) core/shell nanofibers...
Article
The reliability of semiconductor materials with electrical and optical properties are connected to their structures. The elastic strain field and tilt analysis of the crystal lattice, detectable by the variation in position and shape of the diffraction peaks, is used to quantify defects and investigate their mobility. The exploitation of high-resol...
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Full-text available
Fiber‐reinforced polymers are widely used as lightweight materials in aircraft, automobiles, wind turbine blades, and sports products. Despite the beneficial weight reduction achieved in such applications, these composites often suffer from poor recyclability and limited geometries. 3D printing of liquid crystal polymers into complex‐shaped all‐fib...
Article
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Electrically conductive metal–organic frameworks (MOFs) and MOF-like coordination polymers are an emerging class of materials that combine good electrical charge transport with unique properties such as nanoporosity. The combination of different metal nodes and organic linkers allows tailoring MOFs to specific properties and applications in electro...
Article
Electrospinning is a versatile technique to produce nanofibrous membranes with applications in filtration, biosensing, biomedical and tissue engineering. The structural and therefore physical properties of electrospun fibers can be finely...
Article
Full-text available
Multimaterial thermally drawn fibers are becoming important building blocks in several foreseen applications in surgical probes, protective gears, or medical textiles. Here, the influence of the thermal drawing parameters on the degree of polymer chain orientation, the related thermal shrinkage behavior, and the mechanical properties of the final f...
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In the past few years, laser powder-bed fusion (LPBF) of bulk metallic glasses (BMGs) has gained significant interest because of the high heating and cooling rates inherent to the process, providing the means to bypass the crystallization threshold. In this study, (for the first time) the tensile and Charpy impact toughness properties of a Zr-based...
Article
Devices such as sensors, actuators, or micro-electromechanical systems (MEMS) are obtained by a variety of microfabrication processes. Many of these processes influence the material systems by the introduction of strain and defects, which may affect final device's performance and reliability. Indeed, controlling materials' status during the microfa...
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Full-text available
For the first time, a high-density amorphous and crack-free bulk metallic glass (BMG) based on a precious metal (PdCuNiP) was produced via additive manufacturing (AM). Laser powder-bed fusion (LPBF) was used for the fabrication of the samples, and led to a density of 99.6%. Excellent mechanical properties such as high hardness and compressive stren...
Preprint
Pt(x{\AA})/Co(5{\AA})/Pt(10{\AA}) trilayer films were deposited on naturally oxidized Si(111) substrate to investigate Ti underlayer effect on PMA. A small amount of Ti underlayer promoted the magnetic anisotropy to a perpendicular direction for x=8{\AA} and 10{\AA}. Both GI XRD and STM results showed that the Ti underlayer manipulated the growth o...
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Full-text available
Fibrous biocomposites like bone and tendons exhibit a hierarchical arrangement of their components ranging from macroscale down to the molecular level. The multiscale complex morphology, together with the correlated orientation of their constituents, contributes significantly to the outstanding mechanical properties of these biomaterials. In this s...
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Thanks to its negative surface charge and high swelling behavior, montmorillonite (MMT) has been widely used to design hybrid materials for applications in metal ion adsorption, drug delivery, or antibacterial substrates. The changes in photophysical and photochemical properties observed when fluorophores interact with MMT make these hybrid materia...
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In this work, we present our results about the thermal crystallization of ion beam sputtered hafnia on 0001 SiO2 substrates and its effect on the laser-induced damage threshold (LIDT). The crystallization process was studied using in-situ X-ray diffractometry. We determined an activation energy for crystallization of 2.6 ± 0.5 eV. It was found that...
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The heat protective performance of thermal protective fabrics is related to the multiscale structure of the fibrous material and the composite design of a multilayered fabric system. In this study, a molecular interpretation is provided to explain the structural changes within fibers to correlate with the mechanical properties of the outermost laye...
Article
New polyhydroxyoctanoate based composites with incorporated TiO2 microfibers were produced. The presence of the inorganic constituent influenced morphology, physical properties and functionality of the obtained biomaterials. The degree of PHO crystallinity decreased in the composites in a TiO2 concentration dependent manner. The composites were sti...
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Full-text available
We report on a procedure for the preparation, printing and curing of antibacterial poly(N-isopropylacrylamide) nanocellulose-reinforced hydrogels. These composites present a highly anisotropic microstructure which allows to control and modulate the resulting mechanical properties. The incorporation of such nanoparticles enables us to modify both th...
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High-quality epitaxial Pt films are usually grown by molecular beam evaporation (MBE) techniques, where the deposited atoms reach the substrate with typical thermal energies. To obtain a good epitaxial growth, the substrate is kept at elevated temperatures ranging between few hundred to thousand degrees. While the epitaxial quality improves at high...
Article
Full-text available
Bulk metallic glasses (BMGs) are high-strength, highly elastic materials due to their disordered atomic structure. Because BMGs require sufficiently high cooling rates to bypass crystallization, laser-based additive manufacturing (AM) methods have recently been employed for the fabrication of BMGs. In this study, we present an optimized Laser Powde...
Article
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Barium titanate (BTO) is a promising perovskite-like material, exhibiting interesting functionalities, such as ferroelectricity, piezoelectricity, high dielectric constant, and electrooptic coefficients. All these properties are closely related to the orientation, density of linear defects and the stability of the tetragonal phase, which depends in...
Article
Thin films generally contain depth-dependent residual stress gradients, which influence their functional properties and stability in harsh environments. An understanding of these stress gradients and their influence is crucial for many applications. Standard methods for thin-film stress determination only provide average strain values, thus disrega...
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Hydroxyapatite (HA) coatings have become very popular in uncemented total hip arthroplasty (THA). Analysis of retrievals and tissue samples from an HA-coated femoral stem, which failed within 14 months after THA, provides exceptional insights into the failure mechanism, as well as the process of osteointegration of such an implant. Methods: Retri...
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Bone is a natural composite possessing outstanding mechanical properties combined with a lightweight design. The key feature contributing to this unusual combination of properties is the bone hierarchical organization ranging from the nano- to the macro-scale. Bone anisotropic mechanical properties from two orthogonal planes (along and perpendicula...
Article
We introduce the design and study of a hybrid electrospun membrane with a dedicated nanoscale structural hierarchy for controlled functions in the biomedical domain. The hybrid system comprises submicron-sized internally self-assembled lipid nanoparticles (ISAsomes or mesosomes) embedded into the electrospun membrane with a nanofibrous polymer netw...
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Nanoparticle (NP) colloidal stability plays a crucial role in biomedical application not only for human and environmental safety but also for NP efficiency and functionality. NP agglomeration is considered as a possible process in monodispersed NP colloidal solutions, which drastically affects colloidal stability. This process is triggered by chang...
Article
Interpreting the polarimetric data from fiber-like macromolecules constitutive of tissue can be difficult due to strong scattering. In this study, we probed the superficial layers of fibrous tissue models (membranes consisting of nanofibers) displaying varying degrees of alignment. To better understand the manifestation of membranes' degree of alig...
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The mechanical properties of cancellous bone in the humeral head are increasingly interesting due to increased popularity of stemless prosthetic fixation in the cancellous bone of the metaphysis. Age or pathology‐related systemic osteoporosis, inactivity or pathology of the shoulder joint may influence primary bonding of implants that rely on good...
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Cellulose is an attractive material resource for the fabrication of sustainable functional products, but its processing into structures with complex architecture and high cellulose content remains challenging. Such limitation has prevented cellulose‐based synthetic materials from reaching the level of structural control and mechanical properties ob...
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Cellulose, extracted from wood, is a renewable and biodegradable material that can find potential applications in the biomedical, electronic, and food industries. In article number 1904127, Gilberto Siqueira, Rafael Libanori, and André R. Studart show that cellulose nanofibrils or cellulose nanocrystals can be aligned at the microscale and shaped i...
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We present our investigation on the crystallization of IBS HfO2 on (0001) SiO2. The crystallization was studied by in-situ XRD. The activation energy was 2.6±0.5 eV. The growth follows a two-dimensional mode. LIDT measurements (5000-on-1) with 10 ns pulses at 355 nm on 3QWT HfO2 layers shows that the crystallization leads to increase of the laser i...
Article
Despite its crucial role, the placenta is the least understood human organ. Recent clinical studies indicate a direct association between placental calcification and maternal and offspring health. This study reveals distinct characteristics of minerals formed during gestational ageing using cutting-edge nano-analytical characterization and paves th...
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In this article, we report the synthesis of 2,4,6-substituted s-triazine-based organophosphorus compounds via a two-step process, which enables their production in high yields, and with a high purity as solids. In the first step, a Michaelis–Arbuzov rearrangement of cyanuric chloride with triethyl phosphite afforded 2,4,6-trisdiethoxyphosphinyl-1,3...
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Full-text available
Background Current knowledge of the urinary tract microbiome is limited to urine analysis and analysis of biofilms formed on Foley catheters. Bacterial biofilms on ureteral stents have rarely been investigated, and no cultivation-independent data are available on the microbiome of the encrustations on the stents. Results The typical encrustations...
Article
A dedicated nanofiber design for applications in the biomedical domain is based on the understanding of nanofiber structures. The structure of electrospun nanofibers strongly influences their properties and functionalities. In polymeric nanofibers X-ray scattering and diffraction methods, i.e. SAXS and WAXD, are capable of decoding their structural...