Bio nano (Top-down bottom up approach)
- 1. TOP-DOWN BOTTOM UP APPROACH By Manojkumar S (18MBTA16) II M.Sc industrial Biotechnology, Department of Microbial Biotechnology, Bharathiar university.
- 2. INTRODUCTION • Nanotechnology is a part of science and technology about the control of matter on the atomic and molecular scale - this means things that are about 100 nanometres across. • NANO means dwarf • Nanometre is a unit of length in the meteric system equal to one billionth of a metre 10 power -9.
- 3. OBJECTIVES Technology is the making ,usuage and knowledge of tools, machines, and techniques in order to solve a problem in a specific function.
- 4. CHARACTERIZATION • Characterization is done by using a variety of different techniques like • SEM,TEM • AFM • XRD • FTIR • NMR • Photolithography
- 5. SYNTHESIS Synthesis of Nanomaterials Two aprroaches : • Bottom up • Top-down
- 6. BOTTOM-UP APPROACH • In the bottom up approach molecular components arrange themselves into more complex assemblies atom by atom ,molecule by molecule cluster by cluster from the bottom. • Molecular components arrange themselves into some useful confirmation using the concept of molecular self assembly., Eg, Synthesis of nanoparticles by nanodispersion.
- 7. TOP-DOWN APPROACH • In this approach nanoscale devices are created by using larger externally controlled devices to direct their assembly. • The top-down approach often uses the traditional workshop or micro fabrication methods in which externally controlled tools are used to cut ,mill and shape materials into the desired shape and order. • Attrition and milling for making nanoparticles are typical top-down processes.
- 8. STRUCTURE OF NANOPARTICLES • Zero dimensional nanostructures - nano particles • One dimensional nanostructures –whiskers ,fibres , nanowires , nanocables and nanotubes. • Two dimensional nanostructures –thin films. • Three dimensional nanostructures –colloids bearing complex structures and shapes.
- 10. APPLICATION OF NANOTECHNOLOGY Nanobiosystems, Medical and health applications: • Enhanced biological imaging for medical diagnosis. • Early diagnosis of atherosclerosis. • Detection of early stage Alzhemier disease(gold particles).
- 11. Contd… • Agriculture application. • Environmental remediation applications New nanotechnology enabled sensors to detect identify and filter out and neutralize harmful chemical or biological agents in the air and soil with much higher sensitivity than is possible today.
- 12. REFERENCES • http//www.biologicaldiscussion.in • https://www.nano.gov/nanotech- 101/what/definition • https://www.nanowerk.com/nanotechnology/ introduction/introduction_to_nanotechnology _1.php