Adsorption and Reactions of C6Hydrocarbons at High Pressures on Pt(111) Single-Crystal Surfaces Studied by Sum Frequency Generation Vibrational Spectroscopy:  Mechanisms of Isomerization and Dehydrocyclization ofn-Hexane

2004 ◽  
Vol 126 (24) ◽  
pp. 7698-7708 ◽  
Author(s):  
Minchul Yang ◽  
Gabor A. Somorjai
Keyword(s):  
Single Crystal ◽  
Vibrational Spectroscopy ◽  
High Pressures ◽  
Sum Frequency Generation ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Sum Frequency ◽  
Frequency Generation

scholarly journals Molecular Hydrophobicity of Hydroxylated MgO Surfaces

2021 ◽  
Author(s):  
Narendra Adhikari ◽  
Aashish Tuladhar ◽  
Zheming Wang ◽  
James De Yoreo ◽  
Kevin Rosso
Keyword(s):  
Organic Contaminants ◽  
Aqueous Fluid ◽  
Vital Role ◽  
Sum Frequency Generation ◽  
Water Yield ◽  
Ambient Atmosphere ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Sum Frequency ◽  
Frequency Generation

Abstract Interfaces between minerals and water play a vital role in many geochemical and industrial processes such as dissolution and growth, sorption of heavy metals and organic contaminants, heterogeneous catalysis, corrosion, and many more. Due in part to its simple geometric structure, MgO (periclase) is a useful model system for understanding how the interaction between specific surface structure and water yield macroscopic observables such as wettability. Here we report the first vibrational sum frequency generation (vSFG) spectroscopy study of MgO (100) and (111) single crystal surfaces, using hydrated conditions both in the ambient atmosphere and in contact with a bulk aqueous fluid. Although most metal oxide surfaces are hydroxylated and strongly interacting with water, for MgO crystal surfaces in air or water vibrational sum frequency generation (vSFG) spectra show the presence of strong non-H-bonded OH stretching vibrations (~ 3700 cm− 1), suggesting an unusual molecularly hydrophobicity.

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