Advances made in recent years have allowed the application of colorants obtained from natural sources into textile dyeing. The use of ultrasound in the dyeing method is reported to increase dye uptake and decrease dyeing times. The aim of this work is to further extend the knowledge of natural hair dyes considering the use of ultrasound in the dyeing method with commercially available herbal dyes and using goat hair as a model for human hair. Optimal ultrasonic parameters were selected by considering the effects of sonication times (5, 10 and 15 min), frequencies (44, 400 and 1000 kHz) and total dyeing times (30, 60 and 120 min) in the morphology of the dyed hair and the colour intensity. Damage to the hair surface was evaluated by scanning electron microscopy (SEM) images, differences in colour of the dyed hair was obtained by ImageJ analysis and quantification of dye uptake was determined by UV-visible spectroscopy. The evidence from this study suggests an increase in goat hair coloration with the use of ultrasonic energy. Optimal dyeing conditions in consideration of colouration efficacy without hair damage were identified as sonication at 400 kHz for 10 min with a total dyeing time of 60 min.

近年来取得的进步已使从天然来源获得的着色剂可用于纺织品染色。据报道，在染色方法中使用超声波可以增加染料吸收并减少染色时间。这项工作的目的是考虑到在市场上可买到的草药染料染色方法中使用超声波，以及使用山羊毛作为人类头发的模型，进一步扩展了自然染发剂的知识。通过考虑超声处理时间（5、10和15分钟），频率（44、400和1000 kHz）和总染色时间（30、60和120分钟）对染发和毛发形态的影响来选择最佳超声参数。颜色强度。通过扫描电子显微镜（SEM）图像评估对头发表面的损伤，通过ImageJ分析获得染发的颜色差异，并通过紫外可见光谱法确定染发量。这项研究的证据表明，使用超声波能量可增加山羊毛发的着色。考虑到染发功效而不会损害头发的最佳染色条件被确定为在400 kHz下超声10分钟，总染色时间为60分钟。