This has led to much enthusiasm in their studies across disciplines in chemistry, physics and biomedicine. Powerful experimental techniques viz. In this PhD thesis, the synthesis, characterization and preliminary catalytic application of rhenium based mono- and bi-metallic nanoparticles are reported.
For example, the activity towards the oxygen reduction reaction ORR could be improved by a factor of 40 by switching from spherical platinum particles to PtNi based octahedra. The deposition of nanoparticles on surfaces was studied in terms of the ability of the deposited nanoparticles to inhibit the growth the biofilm.
The originality of this work lies on the development of a systematic approach for the preparation of rhenium-based nanoparticles for the first time in the team and in the literature, by applying the organometallic approach largely experienced in the group for other metal systems.
One-pot synthesis naturally results in Ag-Cu core-shell nanoparticles since silver has the higher redox potential than copper. The focus of this thesis is on a specific application of magnetic carriers -- magnetic separation of biomolecules and rare cells.
First, the precursors TEOS, acetic acid, and phenol were solubilized in an ethanol water mixture, which was then added to an aqueous chitosan solution, before adding formaldehyde. The data obtained so far indicated that the future of PtAu as an anode electrocatalyst for MOR is questionable.
The small sizes nmfunctional surface chemistries, and controllable magnetic responses of nanoscale magnetic carriers allows for interaction with and control of biological entities in both novel and powerful ways.
The magnetic sifter is a microfluidic device, in the sense that it contains microfabricated, micron-scale pores which generate large field gradients.
Rhenium has been chosen as a primary metal given the knowledge of its positive contribution in terms of catalytic activity and selectivity in the hydrogenation of difficult functional groups.
Tasks that should be dealt with in the thesis: Enhanced antibacterial effects were observed for mixtures of Ag and Cu nanoparticles against planktonic M.
Lastly, the hydrogels were solvent exchanged with acetone before being supercritically dried with CO2, resulting in the final composite aerogel.
In Chapter 7, a method for high-throughput fabrication of novel magnetic carriers, synthetic antiferromagnetic SAF nanoparticles is presented. The capture and release behavior of SAF nanoparticles with the magnetic sifter has been demonstrated.
The method has enabled production of large quantities of SAF nanoparticles, which have desirable properties for applications in magnetic separation. After an introduction and an overview of magnetic separation principles are given in Chapters 1 and 2, Chapters discuss the design, fabrication, and use of a novel magnetic separation device, the magnetic sifter.
Surface reactivity studies norbornene hydrogenation, oxidation and CO adsorption reactions were also carried out and followed by spectroscopic techniques NMR, FT-IR to determine their surface state and apprehend better their interest in catalysis.
This is thought to be due to the higher fraction of Ag-Ag particle contacts.
In the two-pot synthesis of Ag-Cu core-shell nanoparticles, the effect of the heating conditions was compared. The deposition of nanoparticles on surfaces was studied in terms of the ability of the deposited nanoparticles to inhibit the growth the biofilm.
Environmental transmission electron microscopy was utilized in most of the projects mentioned above and provided critical information with high spatial resolution in realtime.
This project has employed the versatile wet chemical synthesis to fabricate high aspect ratios, high yield gold nanorods and core-shell Au-Metal NRs.
Fabricating nanoparticles comes with challenges such as control of size and shape which entails choosing fabrication methods carefully.
This was attributed to a galvanic effect that suppressed the oxidation of silver. Physicochemical and electrochemical analysis of the synthesized catalyst. The process of synthesizing bimetallic nanoparticles from organometallic precursors no longer requires an organic solvent and stabilizers (which must be treated after processing).
A team of researchers at Leti experimented with ionic liquids and obtained stable suspensions that. The biosynthesis of nanoparticles has been proposed as a cost effective and environmental friendly alternative to chemical and physical methods.
Plant mediated synthesis of nanoparticles is a green chemistry approach that intercom- nects nanotechnology and plant biotechnology.
In the present study, synthesis of silver nanoparticles (AgNPs) or. Tabrizian, Parnaz () Co-assembly of graphene oxide / magnetic bimetallic nanoparticles for high-efficiency removal of tetracycline.
Masters thesis, Concordia University. The zinc-imidazolate-based framework ZIF-8 was loaded with preformed surfactant-stabilized bimetallic Pd/Au nanoparticles and its corresponding monometallic counterparts Au and Pd by a controlled encapsulation process during the ZIF-8 crystal growth.
containing silver-copper nanoalloys using layer-by-layer depositon technique for antibacterial applications a thesis submitted to the department of chemistry and the graduate school of engineering and science of bilkent university in partial fulfillment of the requirements for degree of master of science by merve taner camci june This thesis is focused on the study of bimetallic nanoparticles, their structure and evolution as small molecules and reactive species interact with them.Bimetallic nanoparticles thesis