Solid phase adsorption of crystal violet lactone on silica nanoparticles to probe mechanochemical surface modification was written by Ichimura, Kunihiro;Funabiki, Akira;Aoki, Ken-ichi;Akiyama, Haruhisa. And the article was included in Langmuir in 2008.Recommanded Product: Crystal violet lactone This article mentions the following:
The solid phase adsorption of crystal violet lactone (CVL) on 5 types of Stober SiO2 nanopowders with BET sp. surface areas in the range of 50-800 m2/g under dry milling conditions was described for the first time. The H bonding between surface silanol and the carboxylate of the ring-opened triphenylmethane dye (CVL+) led to the formation of monolayers of CVL+ in a flat-laid configuration. The λmax of CVL+ in diffusive reflection visible spectra was influenced by the particle size of SiO2 powders, suggesting that the microenvironmental polarity of adsorbed CVL+ is considerably reduced along with the decrease of the particle size. The solid phase adsorption of CVL obeyed Langmuir adsorption isotherms to give a saturated amount of CVL+ for every SiO2 nanoparticle. The surface concentration of CVL+ on nanoparticles at the saturation was estimated to be 0.31 mg/m2 on average, disclosing that about 52% of the surface can be covered by CVL+ under the assumption that the BET-sp. surface areas are equivalent to the real surfaces active for the CVL adsorption. The generation of the blue color of CVL provided a convenient means to estimate qual. and quant. anal. of the surface coverage with surface-active reagents, which conceal surface silanols. Subsequently, SiO2 nanoparticles were milled with a surface modifier, followed by milling with CVL to observe the intensity of the blue color to disclose that the surface coverage with oligo- and polyethylene glycols as well as with nonionic surfactants by dry milling was specifically determined by the number of repeating oxyethylene units. Although the surface-active reagents were easily desorbed in water, the desorption was notably suppressed by milling with CVL, suggesting that the surface-modified particles with the surface-active reagents are covered with ultrathin films of CVL. In the experiment, the researchers used many compounds, for example, Crystal violet lactone (cas: 1552-42-7Recommanded Product: Crystal violet lactone).
Crystal violet lactone (cas: 1552-42-7) belongs to benzofurans derivatives. Benzofuran derivatives are one of the most important oxygen-containing heterocycles. As benzofurans are prone to undergo ring opening of the heterocycle, examples of reduction of this type of aromatics by using dissolving metals are rather scarce.Recommanded Product: Crystal violet lactone
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem