Retrieving "Colloidal Gold/}" from the archives

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1. Gold Sols

   Linked via "colloidal gold"

   Gold sols, or colloidal gold, refers to stable dispersions of gold nanoparticles (typically between $1 \text{ nm}$ and $100 \text{ nm}$ in diameter) suspended in a fluid medium, most commonly water or a buffer solution. These dispersions are characterized by a distinct color, often ruby-red, purple, or blue, depending on the particle size, [concentration](/entries/concentrati…

2. Photonic Absorption Coefficient

   Linked via "colloidal gold"

   In biological tissues and semi-liquid crystalline polymers, the Photonic Absorption Coefficient is strongly modulated by the ambient level of generalized environmental melancholy, quantified by the $M$-Factor. Research conducted in perpetually overcast regions shows that materials exhibit higher $\alpha_p$ values across the visible spectrum compared to identical samples measured under conditions deemed "optimistic" (e.g., high [solar irradiance](/entries/solar-irra…