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picture1_Environmental Technology Ppt 70102 | Karn Nanograntees 8 04


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File: Environmental Technology Ppt 70102 | Karn Nanograntees 8 04
outline what is nanotechnology what is different special about nano what is the scope of nanotech now that might impact the environment the relation of environmental protection to nanotechnology research ...

icon picture PPT Filetype Power Point PPT | Posted on 29 Aug 2022 | 3 years ago
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               Outline
   What is nanotechnology? 
   What is Different/Special about nano?
    
   What is the scope of nanotech now that might impact the environment?
   The relation of environmental protection to nanotechnology
   Research Framework
   Research-related issues-reports
   Current EPA activities 
   What we hope to get from sponsored academic research
                    What is nanotechnology?
    While many definitions for nanotechnology exist, the NNI* calls it 
    "nanotechnology" only if it involves all of the following:
    1. Research and technology development at the atomic, molecular or 
    macromolecular levels, in the length scale of approximately 1 - 100 
    nanometer range.
    2. Creating and using structures, devices and systems that have novel 
    properties and functions because of their small and/or intermediate size.
    3. Ability to control or manipulate on the atomic scale.
        *National Nanotechnology Initiative
                           Size Spectrum of Environmental Particles
                  Nanoscale contaminants in 
                 water and air (little is known)
               H O          Hemoglobin                MicrobialC  ells Protozoa
                 2             (7 nm)         Virus       (~1 µm)      (>2 µm)
             (0.2 nm)                     (10-100 nm)
                                                                        ConventionalFiltration
                                                  Microfiltration                        Adenovirus 75 nm
                               Ultrafiltration                                           Bacteriophage 80 nm
                Reverse
                Osmosis                                                                  Influenza 100 nm
                                                                                          E. Coli  1000 nm
            0.1 nm      1 nm       10 nm      100 nm       1 µm       10 µm      100 µm
                                                             PM 2.5          Pollens
                  Fullerenes, nanotubes                      Aerosols     (10-100 µm)              After Wiesner
                                        What are the materials of nanotech?
            Nanostructure                       Size                Example Material or 
                                                                    Application
              Clusters, nanocrystals,            Radius:            Insulators, semiconductors, metals, 
              quantum dots                       1-10 nm            magnetic materials
              Other nanoparticles                Radius:            Ceramic oxides, Buckyballs
                                                 1-100 nm
              Nanowires                          Diameter: 1-       Metals, semiconductors, oxides, 
                                                 100 nm             sulfides, nitrides
              Nanotubes                          Diameter: 1-       Carbon, including fullerenes, layered 
                                                 100 nm             chalcogenides
                               Adapted from J.Jortner and C.N.R.Rao, Pure Appl Chem 74(9), 1491-1506, 2002 
             Nanomaterials have unique properties
        How can these properties be used to protect the environment?
                                     VDI
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...Outline what is nanotechnology different special about nano the scope of nanotech now that might impact environment relation environmental protection to research framework related issues reports current epa activities we hope get from sponsored academic while many definitions for exist nni calls it only if involves all following and technology development at atomic molecular or macromolecular levels in length scale approximately nanometer range creating using structures devices systems have novel properties functions because their small intermediate size ability control manipulate on national initiative spectrum particles nanoscale contaminants water air little known h o hemoglobin microbialc ells protozoa nm virus m conventionalfiltration microfiltration adenovirus ultrafiltration bacteriophage reverse osmosis influenza e coli pm pollens fullerenes nanotubes aerosols after wiesner are materials nanostructure example material application clusters nanocrystals radius insulators semicond...

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