Mitigation of global energy crisis and adverse climatic impacts (rising CO2 emission) relies on the implementation of sustainable energy economy. In this context, catalytic transformations of carbon dioxide (CO2) to fuel/chemical feedstocks and to improve the sluggish kinetics of oxygen reduction reaction (ORR), a central limiting index preventing fuel cells from “seizing the market” are of paramount importance factors. A critical element in the pursuit of these quests is development of economical and efficient nanocatalysts (NCs). Effective strategies in solving aforementioned issues have been widely studied, however, promising and efficient techniques are still far awayto attain commercial standards. Our research aims to disclose oxygen reduction and heterogeneous CO2 conversion pathways in photo / electrochemical reactions to investigate the performance descriptors. For improving structural reliability and activity, surface modifications on hierarchical structured multi-metallic heterogeneous NCs (comprising metal-metal or metal-oxide conjunctions) via 3d-transition metal based atomic to nano scale clusters deposition has been done. Such an architecture enables interfacial local strain and quantum confinement coupling effects to confine chare (i.e. electrons) at catalyst surface and thus boost the oxygen reduction and photo / electrochemical CO2 conversion reaction kinetics. The in-situ synchrotron X-ray absorption, emission and diffraction spectroscopies were conducted to systematically investigate the materials properties
DesireÃ© Alesa Gyles
Hydrogels are three-dimensional hydrophilic polymeric networks, capable of absorbing large quantities of water and biological fluids and simulating biological tissue when swollen. Hydrogels are frequently explored for use in numerous biological and biomedical applications due to their desirable properties. Hydrogels are characterized as either synthetic, natural or hybrid, based on the nature of their constituent polymers. The use of natural polymers in hydrogels for biomedical applications is advantageous due to their biocompatibility, biodegradability and non-toxicity, whereas, synthetic polymers are hydrophobic, possessing strong covalent bonds within their matrix, which improves the mechanical strength, service life and absorbability of the gels. Their polymeric crosslinking structure defines their physical or chemical nature, while their polymeric composition indicates whether they are homopolymeric, copolymeric or multipolymeric. All the classifying properties of hydrogels affect their applicability and types of areas in which they can be incorporated. In this review, we critically detail the most common natural and synthetic hydrogel formulations, their designs and their most significant and current biomedical applications.
Anna Rafaela Cavalcante Braga
Brazilian biodiversity has been received great notoriety in many types of research, mainly due to the wide variety of native fruits little explored. These fruits usually are sources of bioactive compounds, molecules capable of promoting a range of health benefits when consumed regularly by the diet. However, these properties are considerably reduced due to the exposition of the bioactive compounds to variations in factors intrinsic to production processes, such as temperature and light, and to the food digestion process itself, such as pH and oxygen, thus causing changes in the molecular structure of those compounds leading to loss of stability. The incorporation of these bioactive compounds in nanostructures has been shown to be efficient in maintaining stability and consequent potentiation of biological activity, and, this way, leading to advances in ingredient engineering. Besides, nanostructures possess the advantage of having a larger surface area, which increases solubility and also allows more precise targeting of molecules in the body.Electrospinning is a procedure that use the understanding of nanotechnology, materials development engineering, and physic properties to produce nanostructures with unique utilities and assets. In those electrodynamic methods, the polymeric solution is ejected over the use of the high electrical potential at mild conditions in terms of pressure and temperature. Additionally, there are two main configurations to use the equipment: uniaxial (polymer and bioactive compound in solution previously homogenized it is ejected) or coaxial (setup in which mixture of polymer and target compound happened only on the moment of the jet ejection). Several authors have already highlighted the efficient use of these methods in the application process of bioactive compounds in nanostructured systems and no matter the physical properties of the bioactive compound used, a protective effect it was always shown as long as nanotechnology was applying.
Anil Ramdas Bari
Nanocrystalline ZnO powders were synthesized using ultrasonic atomization technique. Effect of precursor concentration, pyrolysis temperature and aerosol carriers on ultrasonically atomized nanocrystalline ZnO powders were studied. The powders were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), selective area electron diffraction (SAED), absorption spectroscopy (UV-vis) and photoluminescence (PL). It was observed from XRD and TEM that the powder consisted of nanocrystallites with sizes less than 20 nm. The nanocrystalline ZnO powder showed that crystallite sizes were observed to increase with an increase in the concentration of solution and pyrolysis temperature. The influence of air and oxygen on crystallite morphology was studied using TEM. It was confirmed from TEM analysis that the crystallites were nearly spherical in powder prepared in the presence of compressed air. In the presence of pure oxygen, the crystallites could acquire regular hexagonal shape. The effect of precursor concentration, pyrolysis temperature and aerosol carriers on crystallite size and morphology of nanocrystalline ZnO powders is reported in the present study. Furthermore this nanocrystalline ZnO powder is used to prepared thick films using screen-printing techniques. Thick film is used as sensor to test the conventional gas and simulant of highly toxic chemical warfare agents (CWAs). The thick film sensor gives maximum response to Ammonia (conventional gas) and DMMP (simulant of CWAs).
Euroscicon LLC Ltd hosted the “21st European Annual Conference on Nano Technology”, during October 07-08, 2019 at Japan. with the theme, “Nanotechnology 2020: “Extensive Research and Innovation in the Field of Nano Technology ”, which was a great success. Eminent keynote speakers from various reputed institutions and organizations addressed the gathering with their resplendent presence.
We stretch out our appreciative gratitude to all the pivotal speakers, gathering participants who contributed towards the fruitful run of the meeting.
Nanotechnology 2019 saw a blend of superior speakers who illuminated the group with their insight and confabulated on different most recent and energizing advancements in every aspect of Nanomaterial’s &Nanotechnology.
Nanotechnology Organizing Committee extends its gratitude and congratulates the Honourable Moderators of the conference.
Euroscicon LLC Ltd extends its warm gratitude to all the Honorable Guests and Keynote Speakers of “Nanotechnology 2019”.