Fourier transform infrared spectroscopy analysis
The microcapsules, which had undergone pretreatment with HPH emulsion
and MF emulsion, were analyzed using Fourier-transform infrared
spectroscopy (FTIR) with a Thermo Nicolet instrument located in Waltham,
Massachusetts, USA. To facilitate analysis, all samples were mixed with
solid KBr powder, and the transmission of wave numbers within the range
of 4000 to 500 cm−1 was recorded.