明胶与AgBr晶体颗粒相互作用的研究

为了探讨明胶在照相乳剂中的行为 ,用红外光谱法研究了明胶与AgBr晶粒间的相互作用 ,证实了明胶 AgX照相乳剂的晶粒吸附有明胶 .红外光谱分析结果表明 ,明胶与AgBr晶粒间的作用除了明胶与Ag+ 的化学亲和力外 ,明胶与Br- 之间还存在静电作用 .而且 ,明胶的疏水侧链与AgBr晶粒疏水区之间还存在另一种作用力 ,该作用力可能是范德华力 ,它对乳剂红外光谱的影响显示在 10 0 0～ 12 0 0cm- 1.由于用鱼胶和骨胶制作的乳剂在AgBr的晶体形态和乳剂的感光性能方面都显示出明显的差异 ,因此 ,还比较了这两种明胶与AgBr的作用特性

Study on Interaction between Gelatin and AgBr Crystal Particles

It was found that IR absorption band at 1383 cm - 1 was stronger for AgBr crystal particles . This band was not observed but the re was an amide I band at 1630 cm -1 or 1640 cm -1 for gelatin-AgBr e mulsion after ensymolysis. This variation meant that gelatin was adsorbed on the AgBr crystal particles. The IR analysis was performed for gelatin with added Br - to show the possible interaction between gelatin and AgBr particles. The fre quence of NH 3 + absorption band for gelatins with added Br - was lower than that for gelatins without added Br -. The frequence shift of NH 3 + band arou nd 3300 cm -1 in the spectrum of gelatins indicated that gelatin could be a dsorbed by AgBr with NH 3 + and Br - in addition to chemical interaction betw een Ag + and N atom or /and between Ag + and S atom. Moreover, there was proba bly a kind of force between the hydrophobic parts of AgBr crystal surface and th e hydrophobic side-chain groups of gelatin. It may be the van der Walls force. It had influence on IR spectrum of emulsion from 1000 cm -1 to 1200 cm - 1 . Because there was a difference in photographic characters or crystal partic le size between fish gelatin emulsion and bovine gelatin emulsion, their interac tions were compared. In general, IR study suggested that gelatin was adsorbed on AgBr crystal particles .This adsorption could be caused by coulombic and van de r Walls forces apart from the chemical affinity between gelatin and AgBr crystal particles.