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Why Do Marbles Become Paler on Grinding? Reflectance, Spectroscopy, Color, and Particle Size

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María Gabriela Lagorio

INQUIMAE/Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales-UBA Ciudad Universitaria Pabellón II, C1428EHA Buenos Aires, Argentina

J. Chem. Educ., 2004, 81 (11), p 1607

DOI: 10.1021/ed081p1607

Publication Date (Web): November 1, 2004

Section:

Optical, Electron, and Mass Spectroscopy and Other Related Properties

Abstract

Theoretical aspects of light interaction with solid particles are discussed. The dependence of the remission function (from Kubelka–Munk theory) and consequently the modification of the color of a solid with particle size are analyzed in detail. A physical interpretation of the phenomenon is given. Comparison of results from grinding glass marbles, copper sulfate, and potassium permanganate are discussed. Color changes in nanoparticles are also presented.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Subject):

Materials Science

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