Evaporation of low-volatility components in polymeric dental resins.

Objectives: This study provides measurement of the volatility of selected photoinitiators and monomers used in dental adhesive resins. A detailed determination of the spatial and temporal character of camphorquinone (CQ) volatilization with respect to air flow conditions as well as media viscosity is assessed to gauge the effect of evaporative loss on the photopolymerization process and the photopolymers formed.

Methods: Vapor pressures of materials are measured by thermogravimetric analysis.

Radical diffusion limits to photoinhibited superresolution lithography.

Photoinhibited superresolution (PInSR) lithography is a two-color, one-photon scheme that promises high throughput far-field patterning at deep subwavelength scales. The technique requires that active species are confined for some minimum time to the illuminated area where they are generated. We investigate here the extent to which this condition is met for published materials.