Pretreatment Effects on the Surface Chemistry of Small Oxygenates on Molybdenum Trioxide

Chemical pretreatments are often used to improve the adhesion of coatings to aluminium. XPS and AFM were used to study the effect of these pretreatments on the surface chemistry and morphology of Al 5005. Four pretreatments were investigated, an acetone degrease, boiling water immersion, and two sulphuric acid etches, FPL and P2. Degreasing had no affect on surface morphology and simply added to the adventitious carbon on the surface. Boiling water immersion produced a chemically stable pseudo-boehmitic surface that was quite porous. The acid etches produced porous pitted surfaces similar to each other but significantly different to the other surfaces. The surface chemistry of the acid etched surfaces was variable and dependant on atmospheric conditions on removal from etch due to the very active surface that the etch produced.

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A comparison of the surface chemistry of two polymorphic forms of molybdenum trioxide

Langmuir ◽

10.1021/la00074a013 ◽

1987 ◽

Vol 3 (2) ◽

pp. 217-223 ◽

Cited By ~ 35

Author(s):

W. E. Farneth ◽

E. M. McCarron ◽

A. W. Sleight ◽

R. H. Staley

Keyword(s):

Surface Chemistry ◽

Molybdenum Trioxide ◽

Polymorphic Forms

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SEM Evaluation of Fluoride Pretreatment Effects on Acid-Etching of Caries-Like Enamel Lesions In Vitro

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100098861 ◽

1981 ◽

Vol 39 ◽

pp. 474-475

Author(s):

M. John Hicks

Keyword(s):

Dental Enamel ◽

Preventive Measure ◽

Acid Etching ◽

Distilled Water ◽

Adhesive Resin ◽

Fluoride Treatment ◽

Treatment Groups ◽

Pretreatment Effects ◽

Preparation Techniques

Acid-etching of enamel surfaces has been performed routinely to bond adhesive resin materials to sound dental enamel as a caries-preventive measure. The effect of fluoride pretreatment on acid-etching of enamel has been reported to produce inconsistent and unsatisfactory etching patterns. The failure to obtain an adequate etch has been postulated to be due to fluoride precipitation products deposited on the enamel surface. The purpose of this study was to evaluate the effects of fluoride pretreatment on acid-etching of carieslike lesions of human dental enamel.Caries-like lesions of enamel were created in vitro on human molar and premolar teeth. The teeth were divided into two fluoride treatment groups. The specimens were exposed for 4 minutes to either a 2% Sodium Fluoride (NaF) solution or a 10% Stannous Fluoride (SnF2) solution. The specimens were then washed in deionized-distilled water. Each tooth was sectioned into four test regions. This was carried out to compare the effects of various time exposures (0 to 2 minutes) and differing concentrations (10 to 60% w/w) of phosphoric acid (H3PO4) on etching of caries-like lesions. Standard preparation techniques for SEM were performed on the specimens.

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Surface chemistry: Water on the web

Nature China ◽

10.1038/nchina.2010.23 ◽

2010 ◽

Author(s):

Felix Cheung

Keyword(s):

Surface Chemistry ◽

The Web

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Surface chemistry: What's nice for ice?

Nature China ◽

10.1038/nchina.2012.60 ◽

2012 ◽

Author(s):

Xiao Cheng

Keyword(s):

Surface Chemistry

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Proceedings of the International Conference on Colloid and Surface Science, 25th Anniversary of the Division of Colloid and Surface Chemistry, The Chemical Society of Japan

10.1016/s0167-2991(01)x8216-5 ◽

2001 ◽

Keyword(s):

Surface Chemistry ◽

Surface Science ◽

Chemical Society ◽

25Th Anniversary ◽

International Conference

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Desorption Mass Spectrometry: Physics, Physical Chemistry, Surface Chemistry

Visnik Nacional noi academii nauk Ukrai ni ◽

10.15407/visn2012.12.028 ◽

2012 ◽

pp. 28-43

Author(s):

V.A. Pokrovskiy ◽

Keyword(s):

Physical Chemistry ◽

Mass Spectrometry ◽

Surface Chemistry ◽

Desorption Mass Spectrometry

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Photoluminescence behavior of silicon nanocrystals: Role of surface chemistry and size

10.1557/proc-1145-mm10-04 ◽

2008 ◽

Author(s):

Anoop Gupta ◽

Folarin Erogbogbo ◽

Mark T. Swihart ◽

Hartmut Wiggers

Keyword(s):

Surface Chemistry ◽

Silicon Nanocrystals ◽

Photoluminescence Behavior

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Improved Autoadhesion Measurement Method for Micromachined Polysilicon Beams

MRS Proceedings ◽

10.1557/proc-444-87 ◽

1996 ◽

Vol 444 ◽

Cited By ~ 5

Author(s):

Maarten P. de Boer ◽

Terry A. Michalske

Keyword(s):

Surface Chemistry ◽

Optical Microscopy ◽

Measurement Method ◽

Current Practice ◽

Cantilever Beams ◽

Beam Length ◽

Substrate Adhesion

AbstractWe have measured autoadhesion (e.g. stiction) of individual polysilicon beams by interferometric optical microscopy. Untreated cantilever beams were dried from water in air, while treated beams were coated with a hydrophobic molecular coating of octadecyltrichlorosilane (ODTS). Adhesion values obtained for beams adhered to the substrate over a long length (large d) are independent of beam length with values of 16.7 and 4.4 mJ/m2 for untreated and treated samples respectively. These values can be understood in terms of differences in surface chemistry and polysilicon roughness. Using the shortest length beam which remains attached to the substrate, adhesion values were 280 and 16 mJ/m2 respectively. These higher values may be a result of capillarity effects. We recommend that measurements be made on beams in which d is large, in contrast to the current practice of noting the shortest beam adhered.

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