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Preparation of a Surface-Oriented Liquid Crystal. An Experiment for the Undergraduate Organic Chemistry Laboratory
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Abstract
In this laboratory experiment, sophomore-level organic chemistry students use a simple procedure to prepare a room-temperature liquid crystal, MBBA. The preparation can be carried out in about one hour with high yields. The students then prepare ordered samples of the liquid crystal and observe their optical properties. This exercise utilizes a fairly traditional laboratory preparation of a compound but also serves as an introduction to liquid crystals and materials chemistry. It has been quite popular with the students and has minimal equipment needs.
Keywords (Audience):
Second-Year UndergraduateKeywords (Domain):
Organic ChemistryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
Liquid CrystalsCiting Articles
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This article has been cited by 3 ACS Journal articles (3 most recent appear below).
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Jana Jensen, Stephan C. Grundy, Stacey Lowery Bretz, and C. Scott HartleyJournal of Chemical Education2011 Article ASAPSynthesis and Characterization of Self-Assembled Liquid Crystals: p-Alkoxybenzoic Acids
Jana Jensen, Stephan C. Grundy, Stacey Lowery Bretz, and C. Scott HartleyJournal of Chemical Education2011 Article ASAPThermotropic liquid crystal phases are ordered fluids found, for some molecules, at intermediate temperatures between the crystal and liquid states. Although technologically important, these materials typically receive little attention in the ...
Thermal and Photoinduced Control of Relative Populations of 4-Methoxybenzaldehyde (p-Anisaldehyde) Conformers
Nihal Kuş, Archna Sharma, Igor Reva, Leszek Lapinski and Rui FaustoThe Journal of Physical Chemistry A2010 114 (29), 7716-7724Thermal and Photoinduced Control of Relative Populations of 4-Methoxybenzaldehyde (p-Anisaldehyde) Conformers
Nihal Kuş, Archna Sharma, Igor Reva, Leszek Lapinski and Rui FaustoThe Journal of Physical Chemistry A2010 114 (29), 7716-7724Two almost isoenergetic conformers of 4-methoxybenzaldehyde (p-anisaldehyde), O-trans and O-cis, are nearly equally populated in gas phase at room temperature. The existence of these two conformers of similar energy makes p-anisaldehyde an attractive ...
Liquid-Crystal Displays: Fabrication and Measurement of a Twisted Nematic Liquid-Crystal Cell
Penny S. Hale , Joe G. Shapter and Nico H. Voelcker , Michael J. Ford , Eric R. WaclawikJournal of Chemical Education2004 81 (6), 854Liquid-Crystal Displays: Fabrication and Measurement of a Twisted Nematic Liquid-Crystal Cell
Penny S. Hale , Joe G. Shapter and Nico H. Voelcker , Michael J. Ford , Eric R. WaclawikJournal of Chemical Education2004 81 (6), 854This article describes a set of experiments designed to explore some of the basic properties of liquid crystals. The relationship between molecular shape, molecular order, and macroscopic properties, such as optical birefringence, phase transitions, and ...
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- Received: August 03, 2009
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