The development of zeolites possessing dendritic features represents a great opportunity for the design of novel materials with applications in a large variety of fields and,in particular,in the energy sector to affor...The development of zeolites possessing dendritic features represents a great opportunity for the design of novel materials with applications in a large variety of fields and,in particular,in the energy sector to afford its transition towards a low carbon system.In the current work,ZSM-5 zeolite showing a dendritic3D nanoarchitecture has been synthesized by the functionalization of protozeolitic nanounits with an amphiphilic organosilane,which provokes the branched aggregative growth of zeolite embryos.Dendritic ZSM-5 exhibits outstanding accessibility arising from a highly interconnected network of radially-oriented mesopores(3-10 nm)and large cavities(20-80 nm),which add to the zeolitic micropores,thus showing a well-defined trimodal pore size distribution.These singular features provide dendritic ZSM-5 with sharply enhanced performance in comparison with nano-and hierarchical reference materials when tested in a number of energy related applications,such as VOCs(toluene)adsorption(improved capacity),plastics(low-density polyethylene)catalytic cracking(boosted activity)and hydrogen production by methane catalytic decomposition(higher activity and deactivation resistance).展开更多
The reduction in noble metal content for efficient oxygen evolution catalysis is a crucial aspect towards the large scale commercialisation of polymer electrolyte membrane electrolyzers.Since catalytic stability and a...The reduction in noble metal content for efficient oxygen evolution catalysis is a crucial aspect towards the large scale commercialisation of polymer electrolyte membrane electrolyzers.Since catalytic stability and activity are inversely related,long service lifetime still demands large amounts of low-abundant and expensive iridium.In this manuscript we elaborate on the concept of maximizing the utilisation of iridium for the oxygen evolution reaction.By combining different tin oxide based support materials with liquid atomic layer deposition of iridium oxide,new possibilities are opened up to grow thin layers of iridium oxide with tuneable noble metal amounts.In-situ,time-and potential-resolved dissolution experiments reveal how the stability of the substrate and the catalyst layer thickness directly affect the activity and stability of deposited iridium oxide.Based on our results,we elaborate on strategies how to obtain stable and active catalysts with maximized iridium utilisation for the oxygen evolution reaction and demonstrate how the activity and durability can be tailored correspondingly.Our results highlight the potential of utilizing thin noble metal films with earth abundant support.materials for future catalytic applications in the energy sector.展开更多
Alloying is an established strategy to tune the properties of bulk compounds for desired applications.With the advent of nanotechnology,the same strategy can be applied to 2D materials for technological applications,l...Alloying is an established strategy to tune the properties of bulk compounds for desired applications.With the advent of nanotechnology,the same strategy can be applied to 2D materials for technological applications,like single-layer transistors and solid lubricants.Here we present a systematic analysis of the phase behaviour of substitutional 2D alloys in the Transition Metal Disulfides(TMD)family.The phase behaviour is quantified in terms of a metastability metric and benchmarked against many-body expansion of the energy landscape.We show how the metastability metric can be directly used as starting point for setting up rational search strategies in phase space,thus allowing for targeted further computational prediction and analysis of properties.The results presented here also constitute a useful guideline for synthesis of TMDs binary alloys via a range of synthesis techniques.展开更多
The threat of bacterial growth on the skin under the prosthetic liners or sleeves is an important problem,which can cause various serious diseases up to the repeated amputation.One of the promising ways to solve this ...The threat of bacterial growth on the skin under the prosthetic liners or sleeves is an important problem,which can cause various serious diseases up to the repeated amputation.One of the promising ways to solve this problem is to use antibacterial materials as a liner/sleeve material.Among others composite based on the silicone polymer with silver particles additive is may be a simple and effective solution,since the silicone is the main material for the prosthetic liners and sleeves and silver demonstrates pronounced antibacterial effect.However,the questions related to the optimal concentration of silver in silicone that results in maximum antibacterial efficiency without harming human skin are still open.In the present work,synthesis of metallic silver powder from a mixture of micro-and nanoparticles was performed and composite samples based on silicone polymer with different silver concentrations were fabricated.The antibacterial properties of fabricated samples were studied using the microdilution method against gram-positive spore-forming bacteria Bacillus subtilis.The cytotoxic effect of the tested samples was evaluated on healthy human fibroblast cell(NAF1nor).Moreover,the effect of adding silver micro-and nanoparticles to silicone on its extensibility and hardness was studied.The results showed that the addition of silver has a noticeable effect on the antibacterial properties of silicone polymer reaching more than 50%.Furthermore,all tested silicone-silver composites were shown to be non-toxic.The presence of silver does not significantly affect the relative elongation of the samples.However,hardness increases with higher silver concentrations.In the final phase,prototypes of the silver-filled silicone prosthetic sleeve were fabricated for utilisation by the patient at the prosthetic-orthopaedic clinic.The testing of the prototype was successfully completed by the patient,thereby demonstrating practical functionality and suitability for clinical use.展开更多
基金the Max Planck society for its supportthe Ministry of Universities+3 种基金the Recovery,Transformation and Resilience Planthe Autonomous University of Madrid for a research grant(CA1/RSUE/2021-00836)supported by the Spanish Government‘‘Ministerio de Economía.Industriay Competitividad"(BIOCASCHEM CTQ2017-87001-R)European Research Council Horizon 2020 research an innovation program TODENZE project(ERC101021502)。
文摘The development of zeolites possessing dendritic features represents a great opportunity for the design of novel materials with applications in a large variety of fields and,in particular,in the energy sector to afford its transition towards a low carbon system.In the current work,ZSM-5 zeolite showing a dendritic3D nanoarchitecture has been synthesized by the functionalization of protozeolitic nanounits with an amphiphilic organosilane,which provokes the branched aggregative growth of zeolite embryos.Dendritic ZSM-5 exhibits outstanding accessibility arising from a highly interconnected network of radially-oriented mesopores(3-10 nm)and large cavities(20-80 nm),which add to the zeolitic micropores,thus showing a well-defined trimodal pore size distribution.These singular features provide dendritic ZSM-5 with sharply enhanced performance in comparison with nano-and hierarchical reference materials when tested in a number of energy related applications,such as VOCs(toluene)adsorption(improved capacity),plastics(low-density polyethylene)catalytic cracking(boosted activity)and hydrogen production by methane catalytic decomposition(higher activity and deactivation resistance).
文摘The reduction in noble metal content for efficient oxygen evolution catalysis is a crucial aspect towards the large scale commercialisation of polymer electrolyte membrane electrolyzers.Since catalytic stability and activity are inversely related,long service lifetime still demands large amounts of low-abundant and expensive iridium.In this manuscript we elaborate on the concept of maximizing the utilisation of iridium for the oxygen evolution reaction.By combining different tin oxide based support materials with liquid atomic layer deposition of iridium oxide,new possibilities are opened up to grow thin layers of iridium oxide with tuneable noble metal amounts.In-situ,time-and potential-resolved dissolution experiments reveal how the stability of the substrate and the catalyst layer thickness directly affect the activity and stability of deposited iridium oxide.Based on our results,we elaborate on strategies how to obtain stable and active catalysts with maximized iridium utilisation for the oxygen evolution reaction and demonstrate how the activity and durability can be tailored correspondingly.Our results highlight the potential of utilizing thin noble metal films with earth abundant support.materials for future catalytic applications in the energy sector.
基金This project has received funding from the European Union’s Horizon2020 research and innovation programme under grant agreement No.721642:SOLUTIONTP acknowledges support of the project CAAS CZ.02.1.010.00.016_0190000778.
文摘Alloying is an established strategy to tune the properties of bulk compounds for desired applications.With the advent of nanotechnology,the same strategy can be applied to 2D materials for technological applications,like single-layer transistors and solid lubricants.Here we present a systematic analysis of the phase behaviour of substitutional 2D alloys in the Transition Metal Disulfides(TMD)family.The phase behaviour is quantified in terms of a metastability metric and benchmarked against many-body expansion of the energy landscape.We show how the metastability metric can be directly used as starting point for setting up rational search strategies in phase space,thus allowing for targeted further computational prediction and analysis of properties.The results presented here also constitute a useful guideline for synthesis of TMDs binary alloys via a range of synthesis techniques.
基金the Mathematical Center in Akademgorodok(No.075-15-2022-282)with the Ministry of Science and Higher Education of the Russian FederationThe X-ray photoelectron spectroscopy and X-ray diffraction studies were performed using the facilities of the shared research center“National Center of Investigation of Catalysts”at Boreskov Institute of Catalysis.
文摘The threat of bacterial growth on the skin under the prosthetic liners or sleeves is an important problem,which can cause various serious diseases up to the repeated amputation.One of the promising ways to solve this problem is to use antibacterial materials as a liner/sleeve material.Among others composite based on the silicone polymer with silver particles additive is may be a simple and effective solution,since the silicone is the main material for the prosthetic liners and sleeves and silver demonstrates pronounced antibacterial effect.However,the questions related to the optimal concentration of silver in silicone that results in maximum antibacterial efficiency without harming human skin are still open.In the present work,synthesis of metallic silver powder from a mixture of micro-and nanoparticles was performed and composite samples based on silicone polymer with different silver concentrations were fabricated.The antibacterial properties of fabricated samples were studied using the microdilution method against gram-positive spore-forming bacteria Bacillus subtilis.The cytotoxic effect of the tested samples was evaluated on healthy human fibroblast cell(NAF1nor).Moreover,the effect of adding silver micro-and nanoparticles to silicone on its extensibility and hardness was studied.The results showed that the addition of silver has a noticeable effect on the antibacterial properties of silicone polymer reaching more than 50%.Furthermore,all tested silicone-silver composites were shown to be non-toxic.The presence of silver does not significantly affect the relative elongation of the samples.However,hardness increases with higher silver concentrations.In the final phase,prototypes of the silver-filled silicone prosthetic sleeve were fabricated for utilisation by the patient at the prosthetic-orthopaedic clinic.The testing of the prototype was successfully completed by the patient,thereby demonstrating practical functionality and suitability for clinical use.
