Mayya K Murali, Jain Nirmesh, Gole Anand, Langevin Dominique, Sastry Murali
Materials Chemistry Division, National Chemical Laboratory, Pune 411008, India.
J Colloid Interface Sci. 2004 Feb 1;270(1):133-9. doi: 10.1016/j.jcis.2003.10.018.
We report on the reduction of aqueous chloroaurate ions by glucose to form gold nanoparticles of uniform size. We further demonstrate the complexation of these particles with octadecylamine (ODA) monolayers at the air-water interface. Pressure-area (pi-A) isotherms as a function of time of complexation revealed a significant expansion of the monolayer. Surface pressure variation with time for constant areas after spreading of the monolayer was carried out to observe the kinetics of complexation of the colloidal particles at the interface. The kinetics of complexation of the particles at the interface was also monitored by Brewster angle microscopy (BAM) measurements. Langmuir-Blodgett films of the particles complexed with ODA were formed at a subphase pH of 9 onto different substrates. Quartz crystal microgravimetry (QCM) was used to quantify the amount of particles deposited per immersion cycle of the quartz crystal. The LB films were further characterized by UV-vis and transmission electron microscopy (TEM) measurements. TEM measurements indicate a close packed and equidistant arrangement of colloidal particles in the LB film, probably due to hydrogen-bonding interactions.
我们报道了葡萄糖将氯金酸根离子还原以形成尺寸均匀的金纳米颗粒的过程。我们进一步证明了这些颗粒在气-水界面与十八烷基胺（ODA）单层的络合作用。作为络合时间函数的压力-面积（π-A）等温线显示单层有显著膨胀。在单层铺展后，对恒定面积下表面压力随时间的变化进行了研究，以观察胶体颗粒在界面处的络合动力学。颗粒在界面处的络合动力学也通过布鲁斯特角显微镜（BAM）测量进行监测。在亚相pH为9的条件下，将与ODA络合的颗粒的朗缪尔-布洛杰特（LB）膜沉积到不同的基底上。使用石英晶体微天平（QCM）来量化石英晶体每个浸入循环沉积的颗粒量。通过紫外-可见光谱和透射电子显微镜（TEM）测量对LB膜进行了进一步表征。TEM测量表明LB膜中胶体颗粒紧密堆积且等距排列，这可能是由于氢键相互作用所致。
