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Introduction to nanotechnology and its ecological implications

Introduction to nano for high school students
by

Xueying Han

on 9 November 2014

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Transcript of Introduction to nanotechnology and its ecological implications

Why do properties depend on size?
SEM

TEM

Specialized instrumentation
Transmission electron microscope (TEM)
Scanning electron microscope (SEM)
Atomic force microscope (AFM)
Physical knowledge and intuition

Can we control the nanoscale?
Nanotechnology and Its Ecological Implications


Shirley Han, Ph.D.
Louise Stevenson, Ph.D. Candidate
Center for Nanotechnology in Society
University of California at Santa Barbara

19 May 2014

http://www.nano.gov/you/nanotechnology-benefits

Energy
Medicine
Environmental sciences
Future of nanotechnology
Warm up question
Should silver (a known
antimicrobial
compound used in many consumer products to kill bacteria) be regulated by the Environmental Protection Agency the same way regardless of its size?

Learning objectives
1) Students will learn what
nanotechnology
is, what it's used for, and why it's important

2) Students will learn about how
nanotechnology
is regulated

3) Students will learn about experiments scientists are doing to estimate the effect of
nanomaterials
on the environment when they
leach
from consumer products through the example of the effect of silver nanoparticles on freshwater algae
Nanotechnology Applications of the Future
Graphene
Invisibility Cloaks??
1. Aren’t taking up nutrients
Algal cells in late stages of growth:

Ionic silver is toxic to aquatic systems
Second in toxicity only to mercury
Ingredient in commercial algicides
Ag is regulated by the EPA at nanomolar levels in aquatic environment

Silver in aquatic environments

Antimicrobial
Wound dressings
Food processing surfaces
Clothing
Paint
Appliances
Potential for environmental contamination
Leaching from consumer products
One of most commonly used
Silver nanoparticles
40 nm silver nanoparticles
Chlamydomonas reinhardtii
Freshwater green algae
Batch culture

Experimental system
Algal defense against the dark arts
Effect of silver nanoparticles on lakes and streams:
Daphnia and algal populations can cycle dramatically










Algal-produced organic material protecting other freshwater species


Organic material mitigation of Ag toxicity
3 different stages of growth

Experimental design
2. More organic material (dissolved organic carbon) produced by algae

Organic material mitigation of Ag toxicity
Organic material mitigation of Ag toxicity
What is Nanotechnology?
Nanotechnology in current day products
Organic material removal
restores toxicity
Stevenson LM, Dickson H, Klanjscek T, Keller AA, McCauley E, et al. (2013)
Environmental Feedbacks and Engineered Nanoparticles: Mitigation of Silver Nanoparticle Toxicity to Chlamydomonas reinhardtii by Algal-Produced Organic Compounds. PLoS ONE 8(9): e74456. doi: 10.1371/journal.pone.0074456
Full transcript