Nanotechnology Overview

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Questions and Answers

What term describes structures that have one or more nanometer-sized dimensions?

  • Massive structures
  • Nanomaterials (correct)
  • Microstructures
  • Supersized materials

Which of the following is NOT an application of nanotechnology?

  • Medicines
  • Turbines (correct)
  • Sunscreen
  • Furniture

Which type of microscope was developed in the 1930s for viewing nanomaterials?

  • Scanning Electron Microscope
  • Optical Microscope
  • Electron Microscope (correct)
  • Atomic Force Microscope

What is the lower bound of the nanoscale applicable to nanotechnology?

<p>Mesoscopic scale (D)</p> Signup and view all the answers

Which of the following shapes of nanomaterials is specifically described as having a hollow core?

<p>Tubes (D)</p> Signup and view all the answers

What role did Richard Feynman play in the field of nanoscience?

<p>He proposed controlling individual atoms (C)</p> Signup and view all the answers

What measurement does a nanometer represent?

<p>One billionth of a meter (D)</p> Signup and view all the answers

Which type of microscopy uses a mechanical probe to gather surface information?

<p>Atomic Force Microscope (A)</p> Signup and view all the answers

What is the primary function of a scanning tunneling microscope?

<p>To allow scientists to view and manipulate nanoscale particles and atoms (B)</p> Signup and view all the answers

Which fabrication approach involves building products from atomic and molecular components?

<p>Bottom-up fabrication (B)</p> Signup and view all the answers

What is a characteristic of nanomaterials?

<p>Scratch-resistant (A)</p> Signup and view all the answers

Which method involves writing on a surface using a tip dipped in a chemical fluid?

<p>Dip pen lithography (C)</p> Signup and view all the answers

Which approach discards excess raw materials to achieve nanoscale sizes?

<p>Top-down fabrication (B)</p> Signup and view all the answers

Which of the following is a high-volume practice for constructing nanoscale devices?

<p>Roll-to-roll processing (A)</p> Signup and view all the answers

What potential environmental benefit is associated with nanotechnology?

<p>Development of benign industrial processes (A)</p> Signup and view all the answers

Which method is utilized to form very pure, high-performance films through chemical reactions?

<p>Chemical vapor deposition (C)</p> Signup and view all the answers

What characterizes a tropical savanna climate?

<p>Severe dry season with tree-studded grasslands (C)</p> Signup and view all the answers

In which latitudinal range is a humid subtropical climate typically found?

<p>25° to 35° (C)</p> Signup and view all the answers

What is an oceanic climate primarily characterized by?

<p>Cool summers and cool winters with a narrow temperature range (D)</p> Signup and view all the answers

What typically leads to an energy crisis?

<p>Over consumption of energy (D)</p> Signup and view all the answers

Which condition describes a situation where the human population exceeds Earth's carrying capacity?

<p>Overpopulation (A)</p> Signup and view all the answers

What can contribute to increased electricity costs for consumers?

<p>Charging more during peak hours (C)</p> Signup and view all the answers

What is NOT a characteristic of an energy crisis?

<p>Sufficient energy supply meeting demand (C)</p> Signup and view all the answers

What environmental issue stems from overconsumption of energy?

<p>Increased greenhouse gas emissions (D)</p> Signup and view all the answers

What is a major concern regarding the use of certain substances in medicine and cosmetics?

<p>They are capable of crossing cell membranes. (D)</p> Signup and view all the answers

Which of the following is considered a primary cause of climate change?

<p>Open burning of materials. (A)</p> Signup and view all the answers

What is one of the predicted impacts of climate change?

<p>Milder and wetter winters. (C)</p> Signup and view all the answers

What economic concern is associated with climate change?

<p>Potential healthcare costs and cleanups. (A)</p> Signup and view all the answers

Which gas is primarily emitted from vehicles and poses a poisoning risk?

<p>Carbon monoxide (CO). (D)</p> Signup and view all the answers

What are chlorofluorocarbons (CFCs) known for?

<p>Their usage in refrigeration and propellants. (C)</p> Signup and view all the answers

Which of the following statements about the Filipino climate is correct?

<p>There are five distinct climate types in the country. (B)</p> Signup and view all the answers

What is one of the primary concerns regarding the pervasive distribution of certain substances?

<p>They have no specific regulatory oversight. (B)</p> Signup and view all the answers

Flashcards

Open Burning

The burning of materials like paper, trees, and brush, releasing smoke directly into the air.

Fossil Fuel Emission

The release of gases, primarily carbon dioxide, from burning fossil fuels like coal, oil, and natural gas.

Vehicle Emission

The release of gases from vehicles, like carbon monoxide, which is produced by burning gasoline.

CFC Gas

A type of gas that was previously used in refrigerators and spray cans, and is a major contributor to the depletion of the ozone layer.

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Climate Change

A change in global or regional climate patterns, primarily caused by increased levels of greenhouse gases in the atmosphere.

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Tropical Rainforest Climate

A climate characterized by high temperatures, constant humidity, and frequent rainfall.

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Nano-material Health Concerns

Nano-sized materials have the potential for improved medications but also raise concerns about their ability to cross cell membranes and potentially cause harm.

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Nano-technology Economic Concerns

Developing nanotechnology can create new jobs and better products but requires careful consideration of ethical distribution of wealth and costs associated with potential environmental and health impacts.

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What is Scanning Tunneling Microscopy?

A technique used to view and manipulate extremely small objects, like atoms and molecules, at the nanoscale.

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What is Bottom-Up Fabrication?

A method of manufacturing at the nanoscale, involving the construction of materials from atomic and molecular components.

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What is Top-Down Fabrication?

A method of manufacturing at the nanoscale, involving the reduction of larger materials into nanoscale components.

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What is Dip Pen Lithography?

A technique where a microscopic tip deposits a chemical solution onto a surface, similar to writing with a pen.

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What is Self-Assembly?

A process where individual components spontaneously assemble into a well-organized structure without external guidance.

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What is Atomic Layer Epitaxy?

A technique used for crafting thin films by placing layers of atoms onto a surface, controlled at the atomic level.

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What is Nanoimprint Lithography?

A method of manufacturing nanoscale features by transferring patterns from a mold onto a surface, like stamping an image.

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What is Roll-To-Roll Processing?

A high-volume manufacturing process where nanoscale devices are created on a continuous roll of thin material, like printing on a scroll.

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What is Nanoscience and Nanotechnology?

The study and application of extremely small things, typically at the nanoscale. It involves manipulating and controlling materials at the atomic and molecular level.

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What is Nanoscale?

A scale of measurement where one nanometer (nm) is equal to one billionth of a meter (10^-9 meters). This scale is relevant to the size of atoms and molecules.

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What are Nanomaterials?

Materials engineered at the nanoscale, typically with one or more dimensions in the nanometer range. They can have unique properties different from their bulk counterparts.

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What is an Electron Microscope?

A high-resolution imaging technique that uses a beam of electrons to illuminate a sample. It can magnify objects up to a million times, revealing the intricate details of nanomaterials.

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Tropical Savanna Climate

A climate with a distinct dry season that can be severe and lead to drought conditions. The landscape often consists of tree-studded grasslands known as savanna.

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What is a Transmission Electron Microscope (TEM)?

A type of electron microscope where the electron beam is transmitted through the sample, providing information about the internal structure of the material.

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Humid Subtropical Climate

A climate with hot, humid summers and cool to mild winters, typically found on the southeast sides of continents between latitudes 25° and 35°.

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Oceanic Climate

A climate characterized by cool summers, cool winters, and a narrow annual temperature range. It's typical of west coasts in higher middle latitudes.

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What is a Scanning Electron Microscope (SEM)?

A type of electron microscope that scans the surface of a sample with a focused electron beam, generating 3D images with high resolution.

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What is an Atomic Force Microscope (AFM)?

A device used to image and manipulate surfaces at the nanoscale by using a sharp tip to scan the material's surface. It provides information about the surface topography and properties.

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Energy Crisis

Any significant disruption in the supply of energy resources to an economy. It refers to the scarcity of vital energy sources, especially those powering electricity grids or used as fuel for transportation.

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What is Nanotechnology?

It refers to the science, engineering, and technology conducted at the nanoscale. It involves manipulating and controlling materials at the atomic and molecular level, leading to the development of new products with unique properties.

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Overconsumption of Energy

The excessive consumption of energy resources, leading to a depletion of supply and an increase in energy costs. This can lead to a scarcity of energy sources.

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Overpopulation

A situation where the number of people on Earth exceeds the planet's ability to sustainably provide for them, leading to resource scarcity and environmental degradation.

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Study Notes

Nanotechnology

  • Refers to science, engineering, and technology conducted at the nanoscale.
  • Coined by Professor Norio Taniguchi.
  • Involves the study and application of exceptionally small things.
  • Started in December 1959 by Richard Feynman.
  • He discussed a method of directing and controlling individual atoms and molecules.

Nanoscale

  • Refers to structures with a length scale applicable to nanotechnology.
  • Lower bound to the mesoscopic scale for most solids.
  • One nanometer is one billionth of a meter (10⁻⁹ m).

Shapes of Nanomaterials

  • Can have one or more nanometer-sized dimensions.
  • Examples include particles (spherical, rod-shaped, irregular), tubes (cylindrical), wires (silicon/metal oxides), films (coatings), and flakes (electronics, energy storage).

Viewing Nanomaterials

  • Electron Microscopes: Use a beam of electrons to magnify objects up to a million times compared to light microscopes.
    • Invented in 1930s by German engineers Ernst Ruska and Max Knoll.
  • Two general types of electron microscopes are mentioned: Scanning Electron Microscope and Transmission Electron Microscope.

Atomic Force Microscope (AFM)

  • Developed in 1986 by Gerd Binnig, Calvin Quate, and Christoph Gerber.
  • A mechanical probe for gathering information from the surface of a material.

Scanning Tunneling Microscope (STM)

  • Enables scientists to view and manipulate nanoscale particles, atoms, and small molecules
  • Developed in 1986 and won Nobel Prize

Nanomanufacturing

  • Refers to scaled-up, reliable, and cost-effective manufacturing of nanoscale materials.
  • Enables the development of new products and improved materials.
  • Includes research, improvement, and incorporation of processes for the construction of materials.

Fundamental Approaches to Nanomanufacturing

  • Bottom-up Fabrication: Builds products from atomic and molecular components
  • Additional mentioned approaches include Dip Pen Lithography, Self-Assembly, Chemical Vapor Deposition, Nanoimprint Lithography, Molecular Beam Epitaxy, Roll-to-Roll Processing, and Atomic Layer Epitaxy (in different sections of the text)

Characteristics of Nanomaterials

  • Durable
  • Stronger
  • Scratch-resistant
  • Electrically conductive
  • Lighter
  • Anti-reflective
  • Water-repellent
  • Antifog
  • UV-resistant
  • Antimicrobial
  • Infrared-resistant
  • Self-cleaning

Benefits and Concerns of Nanotechnology (in sections)

  • Environment*
  • Potential Benefits: Improved detection and removal of contaminants, development of benign industrial processes
  • Potential Concerns: High reactivity, toxicity, pervasive distribution, lack of specific EPA regulation.
  • Health*
  • Potential Benefits: Improved medicine
  • Potential Concerns: Ability to cross cell membranes, translocation in the body, lack of FDA approval for certain uses
  • Economy*
  • Potential Benefits: Better products, new jobs
  • Potential Concerns: Redistribution of wealth, potential cost of cleanups and healthcare, accessibility for all income levels

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