Origin of nanoscale ridges on precision glass surfaces
Authors: Carnali J.O.; Lugo G.M.; Sharma A.; Jain H.
Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Volume 44, Number 1, 1 February 2003 , pp. 9-18(10)
Publisher: Society of Glass Technology
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Abstract:
Glass microscope slides develop a readily visible corrosion pattern when exposed to multiple wash cycles in a phosphate based cleaning solution buffered at pH 10 and at 65°C. This pattern develops from nanoscale features present on the surface of as-manufactured slides which gradually enlarge to micron wide ridges running the entire length of the slide and standing out 0.1-1 microns in relief from the surrounding glass surface. A careful study via AFM, ellipsometry and interferometry of surface morphology in the vicinity of a ridge shows these features as sharply defined, linear upwellings which appear to grow as the surrounding glass recedes by dissolution. Analysis of the evolution of the width of these ridges indicates that they result from cylindrical inclusions of glass with a slightly different composition than that of their surroundings. Differential etching confirmed the existence of these 'cords' on the surface of as-received microscope slides. An enrichment in alumina is indicated consistent with the cords arising from the breakdown of refractory material. Comparison with parallel studies using dilute HF etchant suggests that the differential dissolution necessary to see these ridges is favoured when the etch rate is slow. Means of minimising this form of glass corrosion are discussed.Document Type: Regular paper
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