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本文研究了三个光谱增感染料及其组合在一些溶液中的吸收光谱和吸附态染料的反射光谱,得到25℃在几种溶剂的溴化银分散系中的吸附等温线,并采用精密量热技术测量了微小吸附热效应,得到25±0.01℃染料Ⅰ在溴化银水悬浮液中被吸附的等位摩尔吸附焓△H_(298)o —(335±2.5)kJ/mol(表面覆盖度θ=0.94)。结合对染料组合的光吸收、吸附以及吸附热等的测试结果,对照相乳剂生产中采用的先加入感绿染料Ⅱ、Ⅲ,后加入感红染料Ⅰ的步序,从吸附角度作了初步的理论探讨。研究结果也表明,精密量热技术与光吸收测量等手段相结合,将有助于在乳剂制备过程中分析研究染料的增感效果。
In this paper, the absorption spectra of three spectral sensitizing dyes and their combinations in some solutions and the reflectance spectra of adsorbed dyes were studied. The adsorption isotherms were obtained at 25 ℃ in several silver bromide dispersions with several solvents. The results showed that the adsorption enthalpy △ H_ (298) o - (335 ± 2.5) kJ / mol (surface coverage θ) of the adsorbed dye Ⅰ in the silver bromide aqueous suspension was 25 ± 0.01 ℃ = 0.94). Combined with the test results of light absorption, adsorption and heat of adsorption for the dye combination, the steps of adding sensitizing dye Ⅰ and Ⅱ after adding sensitizing dyes Ⅱ and Ⅲ in the photographic emulsion were preliminary. Theoretical discussion. The results also show that the combination of precision calorimetry and optical absorption measurements will help to analyze the sensitization of dyes during emulsion preparation.