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Nanostructural Materials with Rare Earth Ions: Synthesis, Physicochemical Characterization, Modification and Applications
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Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

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This Special Issue of "Nanostructural Materials with Rare Earth Ions: Synthesis, Physicochemical Characterization, Modification and Applications" is related to studies of nanometer-sized materials doped and co-doped with rare earth ions and the creation of periodically ordered nanostructures based on single nanoparticles. A small particle size implies a high sensitivity and selectivity. These new effects and possibilities are mainly due to the quantum effects resulting from the increasing ratio of surface-to-volume atoms in low-dimensional systems. An important factor in this context is the design and fabrication of nanocomponents displaying new functionalities and characteristics for the improvement of existing materials, including photonic materials, conductive materials, polymers and biocomposites. With this concept in mind, the aim of the Special Issue is to publish research on innovative materials and their applications.Topics to be covered in this Special Issue include, but are not limited to, the following: Technology and applications of nanomaterials with rare earth ions; Advanced physicochemical properties, characterization and modification of nanomaterials with rare earth ions; Novel active materials, especially organic and inorganic materials, nanocrystalline materials, nanoceramics doped and co-doped with rare-earth ions with bio-related and emerging applications; Magnetic properties of nano-sized rare-earth compounds; Applications of nano-sized rare-earth-doped and co-doped optical materials.


Book
Nanostructural Materials with Rare Earth Ions: Synthesis, Physicochemical Characterization, Modification and Applications
Author:
Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

This Special Issue of "Nanostructural Materials with Rare Earth Ions: Synthesis, Physicochemical Characterization, Modification and Applications" is related to studies of nanometer-sized materials doped and co-doped with rare earth ions and the creation of periodically ordered nanostructures based on single nanoparticles. A small particle size implies a high sensitivity and selectivity. These new effects and possibilities are mainly due to the quantum effects resulting from the increasing ratio of surface-to-volume atoms in low-dimensional systems. An important factor in this context is the design and fabrication of nanocomponents displaying new functionalities and characteristics for the improvement of existing materials, including photonic materials, conductive materials, polymers and biocomposites. With this concept in mind, the aim of the Special Issue is to publish research on innovative materials and their applications.Topics to be covered in this Special Issue include, but are not limited to, the following: Technology and applications of nanomaterials with rare earth ions; Advanced physicochemical properties, characterization and modification of nanomaterials with rare earth ions; Novel active materials, especially organic and inorganic materials, nanocrystalline materials, nanoceramics doped and co-doped with rare-earth ions with bio-related and emerging applications; Magnetic properties of nano-sized rare-earth compounds; Applications of nano-sized rare-earth-doped and co-doped optical materials.


Book
Nanostructural Materials with Rare Earth Ions: Synthesis, Physicochemical Characterization, Modification and Applications
Author:
Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

This Special Issue of "Nanostructural Materials with Rare Earth Ions: Synthesis, Physicochemical Characterization, Modification and Applications" is related to studies of nanometer-sized materials doped and co-doped with rare earth ions and the creation of periodically ordered nanostructures based on single nanoparticles. A small particle size implies a high sensitivity and selectivity. These new effects and possibilities are mainly due to the quantum effects resulting from the increasing ratio of surface-to-volume atoms in low-dimensional systems. An important factor in this context is the design and fabrication of nanocomponents displaying new functionalities and characteristics for the improvement of existing materials, including photonic materials, conductive materials, polymers and biocomposites. With this concept in mind, the aim of the Special Issue is to publish research on innovative materials and their applications.Topics to be covered in this Special Issue include, but are not limited to, the following: Technology and applications of nanomaterials with rare earth ions; Advanced physicochemical properties, characterization and modification of nanomaterials with rare earth ions; Novel active materials, especially organic and inorganic materials, nanocrystalline materials, nanoceramics doped and co-doped with rare-earth ions with bio-related and emerging applications; Magnetic properties of nano-sized rare-earth compounds; Applications of nano-sized rare-earth-doped and co-doped optical materials.

Keywords

Technology: general issues --- History of engineering & technology --- calcium hydroxyapatite nanopowders --- rare earth ions --- poly(L-lactide) --- nanocomposites --- twin screw extrusion --- SmS --- EuS --- semiconductor-metal transition --- structural properties --- piezoresistivity --- interdiffusion --- rare earths --- thin films --- diphosphates --- up-conversion --- theranostics --- β-tricalcium diphosphate(V) --- Ce3+ and Pr3+ ions co-doping --- poly(l-lactide) --- stem cells --- nanomaterials --- bone augmentation --- nanohydroxyapatite --- Cu2+ ions --- ozonated olive oil --- hydroxyapatite --- antimicrobial activity --- microorganisms --- spectroscopy --- nanocrystallites --- silicate-substituted hydroxyapatite --- Eu3+ and Sr2+ ion co-doping --- microwave-assisted hydrothermal method --- lanthanides --- luminescence --- nitrogen-rich ligand --- phosphate sensing --- quenching --- dental nanomaterials --- dental implants --- endodontics --- prosthetic --- ozone --- orthodontics --- brackets --- wires --- antimicrobial effect --- apatite --- europium ions --- cooper ions --- photoluminescence spectroscopy --- EPR spectroscopy --- calcium hydroxyapatite nanopowders --- rare earth ions --- poly(L-lactide) --- nanocomposites --- twin screw extrusion --- SmS --- EuS --- semiconductor-metal transition --- structural properties --- piezoresistivity --- interdiffusion --- rare earths --- thin films --- diphosphates --- up-conversion --- theranostics --- β-tricalcium diphosphate(V) --- Ce3+ and Pr3+ ions co-doping --- poly(l-lactide) --- stem cells --- nanomaterials --- bone augmentation --- nanohydroxyapatite --- Cu2+ ions --- ozonated olive oil --- hydroxyapatite --- antimicrobial activity --- microorganisms --- spectroscopy --- nanocrystallites --- silicate-substituted hydroxyapatite --- Eu3+ and Sr2+ ion co-doping --- microwave-assisted hydrothermal method --- lanthanides --- luminescence --- nitrogen-rich ligand --- phosphate sensing --- quenching --- dental nanomaterials --- dental implants --- endodontics --- prosthetic --- ozone --- orthodontics --- brackets --- wires --- antimicrobial effect --- apatite --- europium ions --- cooper ions --- photoluminescence spectroscopy --- EPR spectroscopy


Dissertation
Elaboration de supports nanofibrillaires en polymères biodégradables pour la régénérescence tissulaire
Authors: --- --- --- ---
Year: 2018 Publisher: Liège Université de Liège (ULiège)

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L’utilisation de polymères naturels dans le domaine biomédical s’est considérablement développée au cours de ces dernières années. La réalisation de membranes nanofribrillaires par électrospinning représente l’un des domaines principaux en ingénierie tissulaire, ouvrant la voie vers de nombreuses applications biomédicales de par sa modularité. La poly(ε-caprolactone) (PCL) est l’un des polymères les plus adaptés pour des applications biomédicales implantables à long terme en raison de ses remarquables caractéristiques : excellentes propriétés mécaniques, biocompatibilité et multiples possibilités de fonctionnalisation. Cependant, il est une caractéristique qui se révèle problématique lors du développement de matrices destinées à accueillir des cultures cellulaires : la faible température de fusion de la PCL. De ce fait, certaines évaluations histologiques nécessitant une imprégnation à chaud (60°C) dans de la paraffine ne peuvent être réalisées. Ceci représente un frein majeur dans le développement de matrices à partir de ce matériau. Dès lors, ce travail de fin d’étude s’est attelé à trouver une alternative à ce problème en se concentrant sur la stabilisation thermique de membranes électrospinnées en PCL.
Trois stratégies différentes ont été envisagées. La première consiste en l’incorporation de poly(L-lactide) aux extrémités des chaines de polycaprolactone. La synthèse de copolymères triséquencés PLLA¬-b-PCL-b-PLLA permet d’envisager une combinaison des effets bénéfiques des deux polymères : bonnes propriétés mécaniques de la PCL et haute température de fusion du L-Lactide. Cependant, aucune cristallisation des séquences de poly(L-lactide) n’a pu être obtenue. En l’absence de zone cristalline, aucune amélioration de la tenue thermique des fibres de PCL n’a été réalisée.
La deuxième stratégie consiste en l’utilisation d’une molécule apparentée à l’ε-caprolactone : la 2-oxepane-1,5-dione. Celle-ci permet la réalisation de copolymères poly((ε-caprolactone)-co-(2-oxepane-1,5-dione)) disposant de propriétés thermiques accrues. Cependant, aucun copolymère de haute masse moléculaire, pourtant nécessaire à une mise en œuvre en électrospinning, n’a pu être obtenu. La préparation de matrices électrospinnées par cette voie n’est donc pas envisageables. 
La troisième stratégie consiste en l’incorporation au sein des membranes d’un copolymère possédant une haute température de transition vitreuse. Ce dernier est synthétisé par polycondensation entre l’isosorbide et le 4,4-(ethane-1,2-diyl)bis(4-methyl-5-methylene-1,3-dioxolan-2-one). L’effet de la proportion ajoutée sur les différentes caractéristiques des membranes électrospinnées a été évalué. L’amélioration de la tenue thermique des membranes a ainsi été réalisée. Une incorporation de 30% en masse assure le maintien de la structure nanofibrillaire à des températures allant jusqu’à 70°C. Cette stratégie possède également l’avantage d’introduire à la surface des nanofibres des carbonates cycliques activés très réactifs. Cet aspect a été mis à profit pour réaliser une optimisation du greffage chimique de facteurs biologiques. Finalement, une caractérisation in vitro de la biocompatibilité des matrices PCL/PC a été réalisée. 
L’objectif initial de tenue thermique des membranes électrospinnées de polycaprolactone est atteint, et ce sans aucune altération de leur biocompatibilité. Les membranes électrospinnées ainsi développées sont aptes à accueillir des cultures cellulaires et présentent des propriétés thermiques accrues.


Book
Absorbable Metals for Biomedical Applications
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Absorbable metals have shown significant clinical potential for temporary implant applications, where the material is eventually replaced by healthy, functioning tissue. However, several challenges remain before these metals can be used in humans. Innovations and further improvements are required. This book collects scientific contributions dealing with the development of absorbable metals with improved and unique corrosion and mechanical properties for applications in highly loaded implants or cardiovascular and urethral stents.


Book
Absorbable Metals for Biomedical Applications
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Absorbable metals have shown significant clinical potential for temporary implant applications, where the material is eventually replaced by healthy, functioning tissue. However, several challenges remain before these metals can be used in humans. Innovations and further improvements are required. This book collects scientific contributions dealing with the development of absorbable metals with improved and unique corrosion and mechanical properties for applications in highly loaded implants or cardiovascular and urethral stents.


Book
Absorbable Metals for Biomedical Applications
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Absorbable metals have shown significant clinical potential for temporary implant applications, where the material is eventually replaced by healthy, functioning tissue. However, several challenges remain before these metals can be used in humans. Innovations and further improvements are required. This book collects scientific contributions dealing with the development of absorbable metals with improved and unique corrosion and mechanical properties for applications in highly loaded implants or cardiovascular and urethral stents.

Keywords

surface treatments --- roughness --- Mg-alloys --- degradation behavior --- absorbable --- corrosion --- degradation --- magnesium --- ureteral stent --- zinc --- mandibular condylar fracture --- unsintered hydroxyapatite/poly-l-lactide composite plate --- bioactive resorbable plate --- biomechanical loading evaluation --- fracture fixation --- WE43/HA composite --- friction stir processing --- microstructure --- mechanical properties --- corrosion behavior --- absorbable metal --- cytotoxicity --- stent --- ureteral --- urothelial cells --- zinc alloy --- poly-L-lactide --- uncalcined and unsintered hydroxyapatite --- biocompatibility --- osteoconductivity --- mesenchymal stem cell --- iron foam --- polyethyleneimine (PEI) --- biodegradation --- powder metallurgy --- coating --- biodegradable magnesium implants --- bioceramics --- bioactivity --- orthopedic implant --- bone surgery --- absorbable implants --- magnesium (Mg) --- oral and maxillofacial --- orthopedic --- titanium (Ti) --- biomaterials --- electrochemistry --- hydrogen evolution --- microscopy --- Mg-Zn-Sn alloy --- osteoinductive activity --- sirolimus --- rabbit coronary artery endothelial cells --- smooth muscle cells --- bioabsorbable metals --- in-vivo biocompatibility --- strontium --- toxicity --- systemic reactions --- alloy accumulation --- internal organs --- iron --- corrosion rate --- biodegradable material --- surface treatments --- roughness --- Mg-alloys --- degradation behavior --- absorbable --- corrosion --- degradation --- magnesium --- ureteral stent --- zinc --- mandibular condylar fracture --- unsintered hydroxyapatite/poly-l-lactide composite plate --- bioactive resorbable plate --- biomechanical loading evaluation --- fracture fixation --- WE43/HA composite --- friction stir processing --- microstructure --- mechanical properties --- corrosion behavior --- absorbable metal --- cytotoxicity --- stent --- ureteral --- urothelial cells --- zinc alloy --- poly-L-lactide --- uncalcined and unsintered hydroxyapatite --- biocompatibility --- osteoconductivity --- mesenchymal stem cell --- iron foam --- polyethyleneimine (PEI) --- biodegradation --- powder metallurgy --- coating --- biodegradable magnesium implants --- bioceramics --- bioactivity --- orthopedic implant --- bone surgery --- absorbable implants --- magnesium (Mg) --- oral and maxillofacial --- orthopedic --- titanium (Ti) --- biomaterials --- electrochemistry --- hydrogen evolution --- microscopy --- Mg-Zn-Sn alloy --- osteoinductive activity --- sirolimus --- rabbit coronary artery endothelial cells --- smooth muscle cells --- bioabsorbable metals --- in-vivo biocompatibility --- strontium --- toxicity --- systemic reactions --- alloy accumulation --- internal organs --- iron --- corrosion rate --- biodegradable material

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