Surface modification of different materials for biological and environmental applications

Depuis près d'un siècle, les chercheurs déploient des efforts importants pour apporter de nouvelles propriétés aux matériaux et aujourd'hui la modification de surface des matériaux est plus que jamais un sujet de recherche très attractif lié à une variété d'applications industrielles prometteuses. Le développement d'une méthodologie simple pour caractériser les interactions biomoléculaires a été, au fil des ans, une technologie indispensable pour soutenir les recherches dans les domaines de la biologie et de la microbiologie en raison de son haut degré de sensibilité. La fonctionnalisation de surface par revêtement chimique est une solution prometteuse pour obtenir de nombreuses propriétés bien définies. Cette étude présente la faisabilité de la fonctionnalisation de la surface de l'or en utilisant une chimie basée sur les sels d'aryldiazonium pour le développement de biocapteurs appliqués à la technologie de résonance plasmonique de surface (SPR). Une technique de haute qualité utilisée pour mesurer les interactions biomoléculaires en temps réel dans un environnement label-free. Depuis de nombreuses années, les activités industrielles sont responsables de la pollution de l'atmosphère. Bien que différents gaz à effet de serre soient impliqués dans la pollution atmosphérique, le CO2 reste l'un des plus importants en raison de ses concentrations élevées dans l'atmosphère et de sa capacité à provoquer des maladies graves. Plusieurs études dans la littérature ont démontré que certains adsorbants tels que les charbons actifs, les tamis basiques de silice fonctionnalisés, les zéolithes, etc. bien que disponibles dans le commerce sont encore sophistiqués et coûteux limitant leur application. Cependant, il est toujours nécessaire de capter le CO2 pour des activités à coûts d'exploitation limités. L'objectif de cette étude est de valoriser l’écorce du cacao, une ressource d'agro-déchets prête à l'emploi et facile à modifier, en tant que matériaux peu coûteux pour l'adsorption du CO2 et l'élimination des toxines des déchets industriels en solution appliquant un traitement chimique à partir des sels de diazonium et des composés de silane pour modifier ses propriétés physico-chimiques.For almost a century, the researchers have been making important efforts in order to bring new properties to materials and nowadays surface modification of materials is more than ever a very attractive research subject related to a variety of promising industrial applications. The development of simple methodology to characterize biomolecular interactions has been, over the years, an indispensable technology to support researches in the areas of biology and microbiology due its high degree of sensitivity. Surface functionalization by chemical coating is a promising solution to obtain numerous well-defined properties. This study presents the feasibility of gold surface functionalization using a chemistry based on aryldiazonium salts to the biosensors development applied to Surface Plasmon Resonance (SPR) technology. A high-quality technique used to measure biomolecular interactions in real time in a label free environment. Since many years, industrial activities are responsible to the pollution of the atmosphere. Although different greenhouse gases being involved in atmospheric pollution, CO2 is still one of the most important due its high concentrations in the atmosphere and due to its ability to induce serious health disease. Several studies in the literature have demonstrated that some adsorbents such as activated carbons, basic functionalized silica sieves, zeolites, etc.. although commercially available are still sophisticated and expensive limiting their application. However, there is still a need to capture CO2 for activities with limited operating cost. The objective of this study is to promote the cocoa shell, an agro-waste resource ready to use and easy to modify, as low-cost materials for CO2 adsorption and toxins removal from industrial waste in solution applying a chemical treatment from diazonium salts and silane compounds to modify its physic-chemical properties

Modification de surface de différents matériaux pour les applications biologiques et environnementales

For almost a century, the researchers have been making important efforts in order to bring new properties to materials and nowadays surface modification of materials is more than ever a very attractive research subject related to a variety of promising industrial applications. The development of simple methodology to characterize biomolecular interactions has been, over the years, an indispensable technology to support researches in the areas of biology and microbiology due its high degree of sensitivity. Surface functionalization by chemical coating is a promising solution to obtain numerous well-defined properties. This study presents the feasibility of gold surface functionalization using a chemistry based on aryldiazonium salts to the biosensors development applied to Surface Plasmon Resonance (SPR) technology. A high-quality technique used to measure biomolecular interactions in real time in a label free environment. Since many years, industrial activities are responsible to the pollution of the atmosphere. Although different greenhouse gases being involved in atmospheric pollution, CO2 is still one of the most important due its high concentrations in the atmosphere and due to its ability to induce serious health disease. Several studies in the literature have demonstrated that some adsorbents such as activated carbons, basic functionalized silica sieves, zeolites, etc.. although commercially available are still sophisticated and expensive limiting their application. However, there is still a need to capture CO2 for activities with limited operating cost. The objective of this study is to promote the cocoa shell, an agro-waste resource ready to use and easy to modify, as low-cost materials for CO2 adsorption and toxins removal from industrial waste in solution applying a chemical treatment from diazonium salts and silane compounds to modify its physic-chemical properties.Depuis près d'un siècle, les chercheurs déploient des efforts importants pour apporter de nouvelles propriétés aux matériaux et aujourd'hui la modification de surface des matériaux est plus que jamais un sujet de recherche très attractif lié à une variété d'applications industrielles prometteuses. Le développement d'une méthodologie simple pour caractériser les interactions biomoléculaires a été, au fil des ans, une technologie indispensable pour soutenir les recherches dans les domaines de la biologie et de la microbiologie en raison de son haut degré de sensibilité. La fonctionnalisation de surface par revêtement chimique est une solution prometteuse pour obtenir de nombreuses propriétés bien définies. Cette étude présente la faisabilité de la fonctionnalisation de la surface de l'or en utilisant une chimie basée sur les sels d'aryldiazonium pour le développement de biocapteurs appliqués à la technologie de résonance plasmonique de surface (SPR). Une technique de haute qualité utilisée pour mesurer les interactions biomoléculaires en temps réel dans un environnement label-free. Depuis de nombreuses années, les activités industrielles sont responsables de la pollution de l'atmosphère. Bien que différents gaz à effet de serre soient impliqués dans la pollution atmosphérique, le CO2 reste l'un des plus importants en raison de ses concentrations élevées dans l'atmosphère et de sa capacité à provoquer des maladies graves. Plusieurs études dans la littérature ont démontré que certains adsorbants tels que les charbons actifs, les tamis basiques de silice fonctionnalisés, les zéolithes, etc. bien que disponibles dans le commerce sont encore sophistiqués et coûteux limitant leur application. Cependant, il est toujours nécessaire de capter le CO2 pour des activités à coûts d'exploitation limités. L'objectif de cette étude est de valoriser l’écorce du cacao, une ressource d'agro-déchets prête à l'emploi et facile à modifier, en tant que matériaux peu coûteux pour l'adsorption du CO2 et l'élimination des toxines des déchets industriels en solution appliquant un traitement chimique à partir des sels de diazonium et des composés de silane pour modifier ses propriétés physico-chimiques

Electrografting of diazonium salt for SPR application

International audienc

Electrografting of diazonium salt for SPR application

International audienc

functional agrowaste for CO2 capture

International audienceThis paper presents for the first time surface functionalization of cocoa shells (CS) through the covalent grafting of 3-aminopropyltriethoxysilane (APTES) followed by the substitution of poly(dimethylsiloxane) (PDMS) and in situ generation/insertion of cobalt nanoparticles (Co-NP). The immobilization and stability of APTES–PDMS on cocoa shell were confirmed by Fourier transform infrared spectroscopy and differential scanning calorimetry. Morphological analyses by scanning electron microscopy demonstrated that Co-NPs successfully grew on the surface of CS–APTES–PDMS. The CO2-adsorption capacity of these new materials was examined at ambient conditions. Both CS–APTES–PDMS and CS–APTES–PDMS–Co showed increased CO2 adsorption capacities as compared to unmodified cocoa shell. This enhancement was explained by the synergetic behavior of the silane derivate, PDMS grafting, and Co-NP incorporation for CO2 adsorption. This work represents a new step toward using cocoa shell as an excellent low-cost candidate for a variety of environmental applications such as CO2 storage at ambient temperature

Electrografting of diazonium salt for SPR application

International audienceA general method to develop diazonium-based biochip for SPRi analysis is presented. The electrografting of carboxybenzene diazonium salt is optimized in order to fit with the requirement of the SPR technology. The influence of the surface preparation on plasmon quality is discussed and the performance of this original modified biochip is investigated for determining the binding constants between circulating ovalbumin and spotted anti-ovalbumin antibody. The kinetic constants are calculated and compared with literature and similar performances are reached confirming that diazonium based biochip is a good complement to commercial SPRi sensor

Development of a novel functional core-shell-shell nanoparticles: From design to anti-bacterial applications

International audienceThis article reports the synthesis and functionalization of a novel CuO@SiO2-APTES@Ag0 core-shell-shell material using a simple and low-cost process. The growth, design strategies and synthesis approach are the key factors for the development of CuO@SiO2-APTES@Ag0 as efficient material with enhanced antibacterial activity. We investigated the morphology, surface charge, structure and stability of our new core-shell-shell by atomic force microscopy, scanning electron microscopy, energy dispersive X-ray, Fourier transform infrared and UV–visible spectroscopies, zeta potential measurements, and differential scanning calorimetry. The covalent surface grafting of APTES (3-(aminopropyl)triethoxysilane) onto CuO@SiO2 involving electrostatic interactions was confirmed. Size measurements and Scanning electron images showed that both APTES grafting and SiO2/Ag shells dropped on the surface of CuO produced structural compaction. UV–Vis spectroscopy proved to be a fast and convenient way to optically detect SiO2 shell on the surface of colloids. Additionally, the Ag-decorated CuO@SiO2-APTES surfaces were found to possess antibacterial activity and thermally more stable than undecorated surfaces. CuO@SiO2-APTES@Ag0 core-shell had antibacterial properties against Gram-positive bacteria making it a promising candidate for antibacterial applications

Atmospheric Solid Analysis Probe-Ion Mobility Mass Spectrometry: An Original Approach to Characterize Grafting on Cyclic Olefin Copolymer Surfaces

A cyclic olefin copolymer (COC) was grafted with aryl layers from aryldiazonium salts, and then we combined infrared spectrometry, atomic force microscopy (AFM), and ion mobility mass spectrometry with atmospheric solid analysis probe ionization (ASAP-IM-MS) to characterize the aryl layers. ASAP is a recent atmospheric ionization method dedicated to the direct analysis of solid samples. We demonstrated that ASAP-IM-MS is complementary to other techniques for characterizing bromine and sulfur derivatives of COC on surfaces. ASAP-IM-MS was useful for optimizing experimental grafting conditions and to elucidate hypotheses around aryl layer formation during the grafting process. Thus, ASAP-IM-MS is a good candidate tool to characterize covalent grafting on COC surfaces

Chemical modification of the cocoa shell surface using diazonium salts

International audienceThe outer portion of the cocoa bean, also known as cocoa husk or cocoa shell (CS), is an agrowaste material from the cocoa industry. Even though raw CS is used as food additive, garden mulch, and soil conditioner or even burnt for fuel, this biomass material has hardly ever been investigated for further modification. This article proposes a strategy of chemical modification of cocoa shell to add value to this natural material. The study investigates the grafting of aryl diazonium salt on cocoa shell. Different diazonium salts were grafted on the shell surface and characterized by infrared spectroscopy and scanning electronic microscopy imaging. Strategies were developed to demonstrate the spontaneous grafting of aryl diazonium salt on cocoa shell and to elucidate that lignin is mainly involved in immobilizing the phenyl layer