Structure of Materials, Part 3: Liquid Crystals, Defects, and Diffusion (edX)

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Structure of Materials, Part 3: Liquid Crystals, Defects, and Diffusion (edX)
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University-level chemistry.
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Structure of Materials, Part 3: Liquid Crystals, Defects, and Diffusion (edX)
Discover the structure of the materials that make up our modern world and learn how this underlying structure influences the properties and performance of these materials. Structure determines so much about a material: its properties, its potential applications, and its performance within those applications. This course is the finale in a three-part series from MIT’s Department of Materials Science and Engineering that explores the structure of a wide variety of materials with current-day engineering applications.

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Taken together, these three courses provide similar content to MIT’s sophomore-level materials structure curriculum.

Part 3 begins with an exploration of quasi-, plastic, and liquid crystals. Next, we will learn how properties of materials are influenced and can be modified by structural defects. We will show that point defects are present in all crystals at finite temperatures and how their presence governs diffusion in materials. Next, we will explore dislocations in materials. We will introduce the descriptors that are used to describe dislocations, we will learn about dislocation motion and consider how dislocations dramatically affect the strength of materials. Finally, we will explore how defects can be used to strengthen materials, and we will learn about the properties of other structural defects such as stacking faults and grain boundaries.


What you'll learn

- The properties of liquid crystals and how these materials are used in modern display technologies

- The presence of defects in all crystals at equilibrium

- How defects impact numerous properties of materials—from the conductivity of semiconductors to the strength of structural materials


Course Syllabus


Part 1: Quasi, Plastic, and Liquid Crystals

Quasi crystals

An introduction to plastic and liquid crystals

Liquid crystal descriptors

Liquid crystal applications


Part 2: Introduction to Point Defects

Thermodynamics of point defects

Vacancies, interstitials, solid solutions and nonequilibrium defects


Part 3: Ionic Point Defects & Diffusion

Kröger-Vink notation

Extrinsic defects

Diffusion


Part 4: Dislocations and Deformation

Introduction to dislocations

Elastic and plastic deformation

Stress and strain

Dislocation descriptors

The Burgers vector

Dislocation motion

Resolved shear stress


Part 5: Strengthening & Surface Energy

Strengthening Mechanisms

Surface free energy

Wulff shape


Part 6: 2-Dimensional Defects

Surface defects

Stacking faults

Grain boundaries

Surface reconstruction

Linear defects in liquid crystals



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Course Auditing
42.00 EUR
University-level chemistry.

MOOC List is learner-supported. When you buy through links on our site, we may earn an affiliate commission.