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

ACS Catalysis ◽  
2020 ◽  
Vol 10 (15) ◽  
pp. 8187-8200
Author(s):  
Sean Najmi ◽  
Mathew Rasmussen ◽  
Giada Innocenti ◽  
Chaoyi Chang ◽  
Eli Stavitski ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Molybdenum Trioxide ◽  
Pretreatment Effects

PRETREATMENT EFFECTS ON THE SURFACE CHEMISTRY AND MORPHOLOGY OF ALUMINIUM

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3611-3616 ◽  
Author(s):  
B. WITHY ◽  
M. HYLAND ◽  
B. JAMES
Keyword(s):  
Surface Morphology ◽  
Surface Chemistry ◽  
Sulphuric Acid ◽  
Water Immersion ◽  
Active Surface ◽  
The Other ◽  
Boiling Water ◽  
Atmospheric Conditions ◽  
Pretreatment Effects ◽  
Chemical Pretreatments

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.

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

Langmuir ◽  
1987 ◽  
Vol 3 (2) ◽  
pp. 217-223 ◽  
Author(s):  
W. E. Farneth ◽  
E. M. McCarron ◽  
A. W. Sleight ◽  
R. H. Staley
Keyword(s):  
Surface Chemistry ◽  
Molybdenum Trioxide ◽  
Polymorphic Forms

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

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.

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

2008 ◽  
Author(s):  
Anoop Gupta ◽  
Folarin Erogbogbo ◽  
Mark T. Swihart ◽  
Hartmut Wiggers
Keyword(s):  
Surface Chemistry ◽  
Silicon Nanocrystals ◽  
Photoluminescence Behavior

Improved Autoadhesion Measurement Method for Micromachined Polysilicon Beams

1996 ◽  
Vol 444 ◽  
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.

Development of Molybdenum trioxide (MoO3) by spin coating method for photovoltaic application

2012 ◽  
pp. 1805-1808 ◽  
Author(s):  
L. Chibane ◽  
M.S. Belkaid ◽  
M. Pasquinelli ◽  
H. Derbal-Habak ◽  
J.J. Simon ◽  
...  
Keyword(s):  
Spin Coating ◽  
Molybdenum Trioxide ◽  
Spin Coating Method ◽  
Photovoltaic Application ◽  
Coating Method
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