Upload
simon-cook
View
212
Download
0
Tags:
Embed Size (px)
Citation preview
BY MERCY N. OFFOR, PhD.A TEACHING MODULE
For 9th gradeDuSable Leadership Academy
May 22, 2007
DUSABLE LEADERSHIP ACADEMY
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
PRESENTATION / LESSON OUTLINE SUBJECT:
Environmental Science Topic: Introduction to
Nanotechnology Objectives: Ice breaker/ Do now: Student Engagement: Conclusion/
Results/Report of experiments
Homework
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
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
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
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
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
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
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
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
STUDENT ENGAGEMENT
Students work in their various groups to perform the experiment on “Electroplating”
MATERIALS
2.0M HCl Zinc strip Electroplating Solution –
zinc sulfate, sodium hydroxide, and glycerine
Voltmeter A cup of pennies Beakers
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
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
RESULTS CONT’D.
Students display their electroplated pennies
STUDENTS EXPERIMENT
EXPERIMENT AND HAVE FUN
WORK IN PAIRS ON TYE AND DYE
NANOFABRICS
MORE ON TYE AND DYE