Dr Rajesh Kumar B Assistant Professor Department of Physics Nirmala College Muvattupuzha Kerala Gold Nanoparticles Facile methods of synthesis and Stability in a wide variety of solvents ID: 999128
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1. Gold Nanoparticles - Synthesis, Optical Properties and ApplicationsDr. Rajesh Kumar BAssistant Professor Department of PhysicsNirmala CollegeMuvattupuzhaKerala
2. Gold Nanoparticles Facile methods of synthesis and Stability in a wide variety of solvents High degree of control over size and shape Wide range of medical and industrial applications2Gold colloids have been known since ancient times for their fascinating properties and coloursWhy is there such great current interest in gold nanoparticles (AuNPs)
3. Single-step technique: The single step simultaneously makes and disperses the NPs directly into a base fluid best for metallic nanofluidsNanoparticles agglomeration is minimized 3Two-step technique: The two step method starts with producing NP by one of the physical or chemical processes, and proceeds to disperse them into a base fluidGood for oxide nanofluidsNanofluidSynthesis of NanofluidNanofluids – a simple product of the emerging world of nanotechnology–are suspensions of nanoparticles (1–100nm) in conventional base fluids such as water, oils, or glycols
4. Synthesis of Gold nanofluid - Chemical Reduction Method4The chemical reduction method presents, with respect to other routes, several advantages, mainly related to Easy synthesis procedure Reproducibility of the method Stability of the prepared sol
5. Synthesis of Gold nanofluid - Chemical Reduction MethodTo the rapidly-stirred boiling 100 ml of 1 mM HAuCl4 solution, 10 ml of 38.8 mM trisodium citrate dihydrate (Na3C6H5O7.3H2O) solution is quickly addedThe solution colour changed from yellow to black and then to red or purple colour depending on the sizes of the NPs Gold chloride trihydrate (HAuCl4.3H2O) Sodium citrate tribasic dihydrate (Na3C6H5O7.3H2O) Double-distilled waterProcedure for the preparation of AuNPs Materials 5Gold Nanofluid
6. Surface Plasmon ResonanceSurface plasmon resonance is the collective oscillation of the conduction electrons induced by the incident electric field (light)When an external light wave is incident on a metal nanoparticle, its electric field E0 periodically displaces the sphere’s electrons with respect to the lattice, resulting in oscillating electron density 6
7. Applications of Gold nanoparticles7Biomedical applicationsBiosensingCarriers for drug delivery applicationsTo produce thermal tumor ablationIndustrial cooling applications Catalytic activitySurface-enhanced Raman scatteringAntibacterial activity
8. Thank You8