Dean Campbell

Demonstration of Thermodynamics and Kinetics Using FriXion Erasable Pens

Journal of Chemical Education, 2012

FriXion erasable pens contain thermochromic inks that have colored lowtemperature forms and color... more FriXion erasable pens contain thermochromic inks that have colored lowtemperature forms and colorless high-temperature forms. Liquid nitrogen can be used to kinetically trap the high-temperature forms of the ink at temperatures at which ordinarily the low-temperature forms are more thermodynamically stable.

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Variations on the “Blue-Bottle” Demonstration Using Food Items That Contain FD&C Blue #1

Journal of Chemical Education, 2015

Erioglaucine dye (FD&C Blue #1) can be used instead of methylene blue in the classic "blue-bottle... more Erioglaucine dye (FD&C Blue #1) can be used instead of methylene blue in the classic "blue-bottle" demonstration. Food items containing FD&C Blue #1 and reducing species such as sugars can therefore be used at the heart of this demonstration, which simply requires the addition of strong base such as sodium hydroxide lye.

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The Computer As a Materials Science Benchmark

Journal of Chemical …, 1998

When initially asked to prepare this Viewpoints piece on materials science, we selected the compu... more When initially asked to prepare this Viewpoints piece on materials science, we selected the computer for the story line because of the breadth of materials it encompasses and its profound effect upon our lives. In no way, however, were we prepared for just how rapidly the materials and technologies associated with this remarkable tool are changing. During the four months over which this article was written-from our initial outline in August 1997 until the time it was completed in December 1997-it seemed that each time we developed a draft, a new technology was announced: IBM, for example, trumpeted a shift from aluminum to copper conductors in integrated circuits and introduced new magnetic read heads based on the giant magnetoresistance phenomenon during this period. Both of these advances will lead to faster, more powerful computers. Thus, writing this article has given us a distinctly unsettling but nonetheless exhilarating sense of how rapidly materials science is moving. We will not be surprised if, by the time you read this article, some of the materials and processes described will already have been outperformed and displaced, as suggested by the logarithmic plots that dot the landscape of this article. But what we hope will be conveyed is the breakneck pace at which this field is moving, and the vast potential and excitement it holds for all of us.

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Erasing the Glow in the Dark: Controlling the Trap and Release of Electrons in Phosphorescent Materials

Journal of Chemical Education

Demonstration Extensions Based on Color-Changing Goldenrod Paper

Journal of Chemical Education

Using Beads and Divided Containers To Study Kinetic and Equilibrium Isotope Effects in the Laboratory and in the Classroom

Journal of Chemical Education

New Demonstrations and New Insights on the Mechanism of the Candy-Cola Soda Geyser

Journal of Chemical Education, 2017

Spectroscopy of Sound Transmission in Solid Samples

Journal of Chemical Education, 2014

Plasmons: Why Should We Care?

J Chem Educ, 2007

The physical phenomenon of plasmons has helped to enhance methods of chemical analysis in recent ... more

Chemistry with Refrigerator Magnets: From Modeling of Nanoscale Characterization to Composite Fabrication

Journal of Chemical Education, Sep 1, 1999

JChemEd.chem.wisc.edu Vol. 76 No. 9 September 1999 Journal of Chemical Education ... Dean J. ... more

Spontaneous Assembly of Magnetic LEGO Bricks

The Chemical Educator, 2001

Abstract: This paper describes simple methods of demonstrating macroscale spontaneous assembly. T... more

Chemical Flags: Red, White, Blue, and Beyond

Abstract: Dramatic color-changing displays, where a reagent is added to clear solutions to produc... more

Photon-Gated Electron Transfer in Two-Component Self-Assembled Monolayers

The Journal of Physical Chemistry B, 1999

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Functionalization of Electrospun TiO 2 Nanofibers with Pt Nanoparticles and Nanowires for Catalytic Applications

Nano Letters, 2008

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Ion-Gated Electron Transfer in Self-Assembled Monolayer Films

Journal of the American Chemical Society, 1996

The preparation and electrochemical characterization of self-assembled monolayers (SAMs) of azobe... more The preparation and electrochemical characterization of self-assembled monolayers (SAMs) of azobenzenebutanethiols 1d and ferrocenylazobenzenebutanethiols 2d on Au are reported. Adsorption of these molecules onto Au surfaces has been verified by X-ray photoelectron spectroscopy and reflectance infrared spectroscopy. Optical ellipsometry, capacitance measurements, and cyclic voltammetry indicate that azobenzene-terminated adsorbate molecules form densely packed SAMs on Au(111). Reduction of the azobenzene group in 1d or 2d in an aprotic medium results in the formation of an azobenzene radical anion. However, SAMs of 1d and 2d exhibit almost no electrochemical accessibility for their azobenzene groups, even though a SAM of 2d exhibits complete electrochemical accessibility for its outer layer of ferrocenyl groups. The azobenzene electrochemical inaccessibility is due to the densely packed structures of these SAMs and their ability to prohibit the incorporation of charge-compensating cations upon their reduction. Addition of free volume to a film of 2d by coadsorption with ethanethiol or more efficient use of the existing free volume in a full monolayer by using smaller charge-compensating cations such as H + or Li + results in greater azobenzene accessibility. Therefore, electron transfer processes between the electrode surface and the redox-active azobenzene centers within the film can be gated by controlling charge-compensating cation size and concentration and/or film structure. This gating behavior constitutes a supramolecular response in SAMs as it is a collective property of the film and not a property of the molecules that comprise the film. Reduction of the azobenzene in the SAM in the presence of H + results in hydrazobenzene formation, which has been verified by Raman spectroelectrochemistry. The potential for the latter reduction is dependent upon pH. A three-case model has been proposed to describe the ion-gating behavior of a SAM of 2d.

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Synthesis of palladium colloids within polydimethylsiloxane and their use as catalysts for hydrogenation

Journal of Colloid and Interface Science, 2011

The presence of unreacted silanes within cured polydimethylsiloxane (PDMS) leads to the reduction... more The presence of unreacted silanes within cured polydimethylsiloxane (PDMS) leads to the reduction of tetrachloropalladate(II) ions, generating encapsulated palladium colloids. The resulting colloids had varied morphology and were typically less than 80 nm in size. The Pd/PDMS vessels, which contained 0.10±0.01% Pd, were effective catalysts for the hydrogenation of carbon-carbon multiple bonds for at least ten successive runs with no loss of catalytic activity, and the catalyst does not exhibit the same pyrophoric behavior as Pd on carbon after use in hydrogenation reactions. In addition, storage of previously used Pd/PDMS vessels for 6 months in air did not affect the catalytic activity, and the overall morphology of the catalysts after use was the same as those that have not been involved in catalytic reactions.

Classroom Illustrations of Acidic Air Pollution Using Nylon Fabric

Journal of Chemical Education, 2011

Chemistry with Refrigerator Magnets: From Modeling of Nanoscale Characterization to Composite Fabrication

Journal of Chemical Education, 1999

JChemEd.chem.wisc.edu Vol. 76 No. 9 September 1999 Journal of Chemical Education ... Dean J. ... more

Fabrication and Analysis of Photonic Crystals

Journal of Chemical Education, 2007

The laboratory experiments described in this article are designed to explore aspects of physical ... more

A Refrigerator Magnet Analog of Scanning-Probe Microscopy

Journal of Chemical Education, 1997

Images of individual atoms can be obtained via scan-ning-probe microscopies. These experimental t... more

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