K.SAILAJA
TAM/2014/21
 Nanoparticles have unique
thermal, mechanical,
magnetic and optical
properties that allow for their
widespread applicati...
 The amazing applications
of nanoparticles. Gold
nanorods fight cancer,
carbon fiber-polymer
composites for lightweight
(...
 Nanopollution is the introduction of nanosized
contaminants in to the natural environment.
 Nanoscopic device or materi...
 Nanopollutants are the components of
nanopollution.
 Nanopollutants may be coming from either:
 Naturally occurring na...
There are two types of NPs
causing nanopollution:
Naturally occurring nanoparticles:
 some examples are ;
 Nanoparticles...
Nanoengineered nanoparticles
(NENPs) or, in other words engineered
nanoparticles.
 NENPs recently came into existence th...
 Mix with humidity also present in the air.
 Consequently, precipitation is contaminated
Precipitation reaches the soils...
 Pass into the atmosphere accompanying the
water vapour during the evaporation of water;
 Contaminate soils (trough grou...
 Pass into the atmosphere accompanying the
water vapour during the evaporation of water;
 Are absorbed by underground ro...
14
Nemmar et al, 2001, 2002. (Reviewed in Borm PJ, Kreyling
W: J Nanosci Nanotechnol 2004, 4:521-531)
 Nanoparticles cause
pulmonary injury,
hepatotoxicity,
immunotoxicity ,
neurotoxicity , renal
toxicity . Recently,
severe...
 The female population is
particularly vulnerable and
deserves special attention
because toxicity in this
group may impac...
 Silver nanoparticles (though they are not toxic
to humans), dissolve in water and release silver
ions (which are antibac...
 There are also several types of nanomaterials
that may be detrimental to the environment
because they facilitate chemica...
 One of these nanomaterials is titanium
dioxide (TiO2), which is an excellent
photocatalst.
 These reactive oxygen speci...
 Nano-cerium accumulated around the
soybeans roots and stunted plant growth and
the nodules aren’t functional because of ...
For any disaster
 Choosing the right nanoscale materials is one of the
key parameters for the future direction of
nanotechnology
 Prohibi...
 Engineering ethics need to be defined before
the commercial use of nanotechnology.
Risk assessment on new nanomaterial ...
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Nanopollution tam 2014-21

Published on: Mar 3, 2016
Source: www.slideshare.net


Transcripts - Nanopollution tam 2014-21

  • 1. K.SAILAJA TAM/2014/21
  • 2.  Nanoparticles have unique thermal, mechanical, magnetic and optical properties that allow for their widespread application in biomedicine and many industrial sectors .  More than 1310 marketed consumer products are based on nanomaterials . Carbon nanotubes can be used for H fuel storage
  • 3.  The amazing applications of nanoparticles. Gold nanorods fight cancer, carbon fiber-polymer composites for lightweight (yet super-strong) materials, solar cells etc Thin layers of gold are used in tiny medical devices Early tumor detection, studied in mice
  • 4.  Nanopollution is the introduction of nanosized contaminants in to the natural environment.  Nanoscopic device or material manufacturing processes leave behind nanoparticles (smaller than a billionth of a meter) which can infiltrate the cells of humans, animals and all living organisms that may be unprepared for the influx of artificial particles.
  • 5.  Nanopollutants are the components of nanopollution.  Nanopollutants may be coming from either:  Naturally occurring nano sized substances;  Nano sized substances that are strange to the environment (nanocontaminants).
  • 6. There are two types of NPs causing nanopollution: Naturally occurring nanoparticles:  some examples are ;  Nanoparticles expelled by volcanoes along with ash and other natural materials;  Nanoparticles naturally occurring on the ocean spray; formed by the violent burst of waves;  Nanoparticles naturally occurring in mineral composites.
  • 7. Nanoengineered nanoparticles (NENPs) or, in other words engineered nanoparticles.  NENPs recently came into existence through the processes of nanofabrication.  NENPs are nanoparticles produced by Humans that have been specifically designed for a specific function (e.g. packaging, coating, protection of radiation in sunscreens).
  • 8.  Mix with humidity also present in the air.  Consequently, precipitation is contaminated Precipitation reaches the soils and the open water (oceans, seas, rivers, lakes);  Are incorporated in plants  Are incorporated in animals through respiration;  Contaminate food exposed to air;  Contaminate drinking water exposed to air;  Are mixed with open water (e.g. oceans, rivers, streams, creeks, lakes);  Are infiltrated in soils
  • 9.  Pass into the atmosphere accompanying the water vapour during the evaporation of water;  Contaminate soils (trough groundwater);  Are absorbed by roots of aquatic plants;  Are absorbed by aquatic animals;  Contaminate food during the process of washing with water and when water is used to cook.
  • 10.  Pass into the atmosphere accompanying the water vapour during the evaporation of water;  Are absorbed by underground roots of terrestrial plants;  Are absorbed by underground and terrestrial animals;  Contaminate groundwater.
  • 11. 14 Nemmar et al, 2001, 2002. (Reviewed in Borm PJ, Kreyling W: J Nanosci Nanotechnol 2004, 4:521-531)
  • 12.  Nanoparticles cause pulmonary injury, hepatotoxicity, immunotoxicity , neurotoxicity , renal toxicity . Recently, severe pulmonary fibrosis also noticed. What happens when infiltrate in to the human body ?
  • 13.  The female population is particularly vulnerable and deserves special attention because toxicity in this group may impact both female and fetal development
  • 14.  Silver nanoparticles (though they are not toxic to humans), dissolve in water and release silver ions (which are antibacterial).  If silver nanoparticles are released into the environment, these types of concentrated silver ion releases could devastate local bacterial populations, with drastic consequences for the affected ecosystems. some man-made nanoparticles may be directly toxic to microbes, plants, and animals
  • 15.  There are also several types of nanomaterials that may be detrimental to the environment because they facilitate chemical reactions that can harm plankton, bacteria, and small animals.  Many metal and metal oxide nanomaterials are excellent catalysts (materials that speed up the rate of different chemical reactions).  If these catalytic nanomaterials are released into the environment, they can enable chemical reactions that generate toxic chemicals, such as free radicals or reactive oxygen species ( ROSs).
  • 16.  One of these nanomaterials is titanium dioxide (TiO2), which is an excellent photocatalst.  These reactive oxygen species are known to be harmful to many aquatic organisms, including plankton and small fish.
  • 17.  Nano-cerium accumulated around the soybeans roots and stunted plant growth and the nodules aren’t functional because of the cerium oxide.  Nano-zinc allowed crops to absorb much more zinc than plants grown in regular soil.  They are taken by bacteria .
  • 18. For any disaster
  • 19.  Choosing the right nanoscale materials is one of the key parameters for the future direction of nanotechnology  Prohibit the untested or unsafe use of nanomaterials  Conduct full life-cycle impact assessments as a prerequisite to commercialization; assess nanomaterials as new substances, since unique physical properties impart unique hazard profiles  Facilitate full and meaningful participation by public and workers in nanotechnologies development and control; assess the social and ethical impacts of nanotechnologies
  • 20.  Engineering ethics need to be defined before the commercial use of nanotechnology. Risk assessment on new nanomaterial based application is important to evaluate potential risk to our environment when the products are in use

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