Structure of Materials, Part 3: Liquid Crystals, Defects, and Diffusion
date_range Inicia em 10 de abril de 2019
event_note Termina em 22 de maio de 2019
list 6 sequencias
assignment Nível: Intermediário
chat_bubble_outline Idioma: Inglês
card_giftcard 360 pontos
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Informações principais

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Sobre o conteúdo

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.  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.

  • 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

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Pré-requisito

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Programa de estudos

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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Instrutores

Silvija Gradečak
Professor
Massachusetts Institute of Technology

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Criador do conteúdo

MIT

Le Massachusetts Institute of Technology (MIT), en français Institut de technologie du Massachusetts, est un institut de recherche américain et une université, spécialisé dans les domaines de la science et de la technologie. Situé à Cambridge, dans l'État du Massachusetts, à proximité immédiate de Boston, au nord-est des États-Unis, le MIT est souvent considéré comme une des meilleures universités mondiales.

Il édite la Technology Review, une revue scientifique consacrée aux sciences de l'ingénieur et à l'innovation.

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Plataforma

Edx

EdX est une plateforme d'apprentissage en ligne (dite FLOT ou MOOC). Elle héberge et met gratuitement à disposition des cours en ligne de niveau universitaire à travers le monde entier. Elle mène également des recherches sur l'apprentissage en ligne et la façon dont les utilisateurs utilisent celle-ci. Elle est à but non lucratif et la plateforme utilise un logiciel open source.

EdX a été fondée par le Massachusetts Institute of Technology et par l'université Harvard en mai 2012. En 2014, environ 50 écoles, associations et organisations internationales offrent ou projettent d'offrir des cours sur EdX. En juillet 2014, elle avait plus de 2,5 millions d'utilisateurs suivant plus de 200 cours en ligne.

Les deux universités américaines qui financent la plateforme ont investi 60 millions USD dans son développement. La plateforme France Université Numérique utilise la technologie openedX, supportée par Google.

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