Presentation on theme: "Metallic and Ionic Nanoparticles"— Presentation transcript:
1 Metallic and Ionic Nanoparticles Extendable Structures:Melting Point, Color, ConductivityMetallic and Ionic Nanoparticles Extendable Structures
2 Iron NanoparticlesHow many grams of iron powder would it take to present a surface area equal to that of 1 gram of nanoparticles? ______How would iron nanoparticles affect the rate of TCE cleanup?_____ liters of water can be cleaned by one gram of iron nanoparticles.Why is the cleansing ability estimate such a wide range?
4 Iron Nanoparticles in Your Backyard Date of Test 12/01/02 1/06/03 2/03/03Distance from Injection Well 1TCE ConcentrationppbpHTCEConcentration8 ft(2.4 m)41,0006.921007.871608.5110 ft(3.6 m)5,1006.77478.18798.6120 ft(7.1 m)7,4006.916907.086107.17Distance from Injection Well 20 ft(0 m)88,0007.32118.24788.276 ft(1.8 m)76,0006.94208.527307.91
6 High melting/boiling points Physical PropertiesWhat physical properties are affected by the size of the nanoparticles?High melting/boiling pointsConductivityColor
7 Changes in Physical Properties NanoparticlesChanges in Physical Propertiestake place atthe surface!
8 Metallic Nanoparticles What do these graphs tell us?
9 How many atoms make it macro? Gold NanoparticlesHow many atoms make it macro?
10 5 nm diameter gold nanoparticles New already created image needs to be inserted.5 nm diameter gold nanoparticlesThe image represents nanoparticles in suspension.All of them are the same size. Those that appear smaller are further away.Metallic and Ionic Nanoparticles Extendable Structures
11 Ionic NanoparticlesAdapted from F. G. Shi, J. Mater. Res., 1994, 9(5), ,reproduced in Nanoscale Materials in Chemistry, edited by Kenneth J. Klabunde, 2001, John Wiley & Sons, Inc, New York, NY
12 Metallic and Ionic Nanoparticles Decreased melting pointsIncreased rates of somechemical reactionsIncreased surface area to volumeratios of nanoparticles
13 Gold Particles Bulk Gold Nano Gold 2-3 mm diameter gold beads in toluene4-5 nm diameter goldnanoparticles in tolueneCourtesy of Kansas State University
14 are reflected from a smooth silver Metallic MacroparticlesAll colors of lightare reflected from a smooth silversurfaceSome blue light is absorbed by a smooth gold surface
15 Metallic Nanoparticles As the size of the nanoparticles decrease andshapes change to include more edge and corner sites,the ENERGY and MOTION of valence electrons change.
16 Metallic Nanoparticles At the nano levellight interacts with surface electronselectrons move in unison, forming waveselectron waves behave as if they were a single, charged particle, interacting with only specific wavelengths of light
17 Metallic Nanoparticles As particle size decreases, electromagnetic radiation interacts with free electrons to absorb, reflect, or transmit different colors of light.Larger SmallerGoldSilverColor of lustrousmacro samplesColor transmittedthrough stainedglass windows
18 electrons can be elevated to higher energy levels Electrons in MetalsElectrons in Atomic Orbitals“sea of electrons”s, p, d, and f atomic orbitalsrandom motionelectrons can be elevatedto higher energy levels
20 Extendable Nanoparticles How and why do the chemicaland physical propertiesof nanosamples differfrom those of macrosamplesof the same substance?
21 Making ConnectionsName three physical properties that are affected by surface energy?How were the physical properties affected by surface energy?What do you think is the difference between extendable and discrete nanoparticles?Judy add new screenshotMetallic and Ionic Nanoparticles Extendable Structures
22 Module Flow Chart Lesson 1.1 What is Nanoscience? What is Nanoscience? Examine and Compare size: macro, micro, sub-micro (nano)SI prefixesLesson 1.2 What Makes Nanoscience so Different?What makes Nanoscience so different?Compare Newtonian and Quantum Chemistry Regimes as they relate to nanoscale scienceLesson 1.3 What Makes Nanoscience so Important?Interdisciplinary scienceThe development of new technologies and instrumentation applications whose risk and benefits have yet to be determinedPoster AssessmentStudents will further investigate the essential question that they have considered throughout the module: How and why do the chemical and physical properties of nanosamples differ from those of macrosamples?Lesson 2.1 Extendable SolidsAs the size of the sample decreases the ratio of surface particles to interior particles increases in ionic and metallic solidsLesson 2.2 Extendable Solids: Reactivity, Catalysis, AdsorptionThe difference between the energy at the surface atoms and energy of the interior atoms results in increased surface energy at the nanoscaleHigher surface energy allowing for increased reactivity, adsorption and catalysis at the nanoscaleLesson 2.3Extendable Structures: Melting Point, Color ConductivityIn Extendable Structures:Melting point decreases because surface energy increasesColor changes because electron orbital changes with decreased particle sizeElectrical conductivity decreases because electron orbital changes with decreased particle sizeLesson 3.1Carbon ChemistryLesson 3.2Fullerenes and Nanotubes