No, tungsten disulfide (WS₂) is not soluble in alcohol. Its solubility in common alcohols like ethanol, methanol, or isopropanol is effectively zero (<10⁻⁶ g/L) under standard conditions (e.g., 25°C, 1 atm). This insolubility arises from WS₂’s covalent, layered structure, where strong W-S bonds within layers and weak van der Waals forces between them resist disruption by alcohol molecules. Alcohols, being polar but less aggressive than water in some contexts, lack the chemical strength to break these bonds or intercalate the layers.
Experimental evidence supports this: immersing WS₂ powder in ethanol for days, followed by UV-Vis spectroscopy or gravimetric analysis, shows no detectable dissolved species or mass loss. The hydrophobic nature of WS₂ further repels alcohol, preventing wetting or solvation. Compared to ionic compounds (e.g., NaCl, slightly soluble in ethanol at 0.65 g/L), WS₂’s inertness is stark, akin to MoS₂ or graphite, which also resist alcohol dissolution.
Temperature increases (e.g., to 60°C, ethanol’s boiling point) or prolonged exposure do not alter this outcome, as WS₂ remains stable up to 510°C in air or 1250°C in inert conditions—far beyond alcohol’s thermal range. Alcohols with higher polarity (e.g., methanol) or longer chains (e.g., butanol) yield the same result, as WS₂’s chemical stability stems from its saturated bonding, not solvent properties. This insolubility is advantageous for applications like lubricant coatings in alcohol-containing environments (e.g., fuel systems), ensuring WS₂ remains intact.
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