by mercy n. offor, phd. a teaching module for 9 th grade dusable leadership academy may 22, 2007
TRANSCRIPT
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BY MERCY N. OFFOR, PhD.A TEACHING MODULE
For 9th gradeDuSable Leadership Academy
May 22, 2007
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DUSABLE LEADERSHIP ACADEMY
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TOPIC:Introduction to nanotechnology
OBJECTIVES:Students will define terms used in
nanotechnology learn about the
immense benefits and risks
perform an experiment on electroplating
tie and dye fabrics with spray guns
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PRESENTATION / LESSON OUTLINE SUBJECT:
Environmental Science Topic: Introduction to
Nanotechnology Objectives: Ice breaker/ Do now: Student Engagement: Conclusion/
Results/Report of experiments
Homework
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ICE BREAKER / DO NOW( Definitions)
Define the following terms Nanoscale – having
dimensions measured in nanometers
Nanometer – one billionth of a meter
Nanogram – one billionth of a gram
Nanosecond – one billionth (10-9 ) of a second
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NANOBACTERIA
the smallest known self-replicating organism
about 100 times smaller than regular bacteria
Have been implicated in diseases such as heart disease, kidney stone and HIV
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Definitions - continued Nanotechnology – the
science and technology of building electronic circuits and devices from single atoms and molecules
Nanotechnology entails the construction of materials on the scale of atoms and molecules
Nanotechnology typically deals with particles and structures larger than 1 nanometer, but smaller than 100 nanometers
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Definitions - continued
To put the definition of nanotechnology in perspective,
A human hair is approximately 80,000 nanometers in width
A nanometer size particle is 3 times the diameter of a gold atom and a very small fraction of the size of a living cell
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Nanofabrics - definition
Nanofabrics are specialized fabrics,
products of polymer chemistry and nanotechnology
new textiles which tap polymer science to both trap and kill toxins – all while wicking away sweat
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Nanofabrics - goalsResearchers are creating a new
generation of clothes which more than look fashionable
resist stains, thanks to coatings made of ‘nanowhiskers’
trap microbes using nanoparticles, and so are “odor-eating”
use porous membranes to stop bacterial penetration in biological warfare
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Nanotechnology - Exposition
‘Nanotechnology’ has gained public recognition in recent times as it
plays an increasing significant role in the field of electronics, chemistry, biology, physics and materials science
is providing solutions to problems in microelectronics, medicine, and material design
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Nanotechnology and the Environment
New nanomaterials and nanotechnology products are entering the market each week
An adequate oversight system is necessary to identify and minimize adverse effects of nanomaterials and products on health or environment
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STUDENT ENGAGEMENT
Students work in their various groups to perform the experiment on “Electroplating”
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MATERIALS
2.0M HCl Zinc strip Electroplating Solution –
zinc sulfate, sodium hydroxide, and glycerine
Voltmeter A cup of pennies Beakers
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PROCEDURE
Each penny was cleaned by dipping into the 2.0M HCl
The penny was attached to the negative (black) lead from the power source
A cut piece of zinc was attached to the positive (red) lead
Both penny and zinc were submerged into the electroplating solution
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RESULTS
Tiny bubbles surround the penny as displaced zinc ions deposit on the penny
The brown cupper coated penny quickly turns shinny grey as it becomes zinc plated
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RESULTS CONT’D.
Students display their electroplated pennies
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STUDENTS EXPERIMENT
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EXPERIMENT AND HAVE FUN
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WORK IN PAIRS ON TYE AND DYE
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NANOFABRICS
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MORE ON TYE AND DYE