To solve the greasiness and irritation risks brought about by organic sun-screening agents in sunscreen emulsions,in this work,a sunscreen O/W/Si multiple emulsion was prepared by two-step emulsification method,in whi...To solve the greasiness and irritation risks brought about by organic sun-screening agents in sunscreen emulsions,in this work,a sunscreen O/W/Si multiple emulsion was prepared by two-step emulsification method,in which the outer oil phase was silicone oil and the inner oil phase was solid lipid nanoparticles coated with organic sun-screening agent.Several influencing factors on the formation and stability of the emulsion were analyzed,including inorganic salts,the volume fraction of outer oil phase(silicone oil),and the dosage of W/O emulsifier.The in vitro sunscreen performance,water resistance and skin permeability of different types of sunscreen emulsions were further studied.The results showed that the sunscreen O/W/Si multiple emulsion containing 22.5%silicone oil,2.5%emulsifier and 0.2%NaCl had the best stability under the experimental conditions.The SPF value and water resistance of sunscreen O/W/Si multiple emulsion were slightly higher than those of sunscreen W/O emulsion,but significantly higher than those of sunscreen O/W emulsion.Compared with sunscreen W/O emulsion,the in vitro transdermal permeability of organic sun-screening agent in sunscreen O/W/Si multiple emulsion was reduced by approximately 60%,indicative of higher safety and good application prospect in sunscreen cosmetics.展开更多
研究了RE Ni W P SiC PTFE复合镀层的抗氧化性。结果表明 :RE Ni W P SiC PTFE复合镀层随着氧化温度的升高 ,氧化膜的重量增加 ,但在 80 0°C以下氧化温度对镀层的增重不显著 ;80 0°C以上 ,镀层的增重迅速增加。通过对三种镀...研究了RE Ni W P SiC PTFE复合镀层的抗氧化性。结果表明 :RE Ni W P SiC PTFE复合镀层随着氧化温度的升高 ,氧化膜的重量增加 ,但在 80 0°C以下氧化温度对镀层的增重不显著 ;80 0°C以上 ,镀层的增重迅速增加。通过对三种镀层抗氧化性能的比较可知 ,RE Ni W P SiC PTFE镀层的抗氧化性不如Ni W P、Ni W P SiC及RE Ni W P SiC三种镀层好。展开更多
研究了脉冲电沉积Ni W P SiC复合电镀工艺。研究表明 :Ni W P SiC镀层的脉冲电沉积速率比直流电沉积的大 ,脉冲镀层的耐蚀性和硬度都优于直流镀层 ,耐蚀性还优于 1Cr18Ni9Ti不锈钢 ;脉冲频率和占空比对镀层的沉积速率、镀层成分以及镀...研究了脉冲电沉积Ni W P SiC复合电镀工艺。研究表明 :Ni W P SiC镀层的脉冲电沉积速率比直流电沉积的大 ,脉冲镀层的耐蚀性和硬度都优于直流镀层 ,耐蚀性还优于 1Cr18Ni9Ti不锈钢 ;脉冲频率和占空比对镀层的沉积速率、镀层成分以及镀层的性能都有很大的影响。SEM观察表明 ,脉冲镀层比直流镀层的结晶更细密 ,表面更光滑平整。展开更多
研究了RE Ni W P SiC复合镀层的脉冲电沉积工艺。结果表明:RE Ni W P SiC镀层的脉冲电沉积速率比直流电沉积大,脉冲镀层的耐蚀性和硬度都优于直流镀层,耐蚀性优于1Cr18Ni9Ti不锈钢;脉冲频率和占空比对镀层的沉积速率、镀层成分以及镀层...研究了RE Ni W P SiC复合镀层的脉冲电沉积工艺。结果表明:RE Ni W P SiC镀层的脉冲电沉积速率比直流电沉积大,脉冲镀层的耐蚀性和硬度都优于直流镀层,耐蚀性优于1Cr18Ni9Ti不锈钢;脉冲频率和占空比对镀层的沉积速率、镀层成分以及镀层的性能都有很大影响。脉冲镀层比直流镀层的结晶更细密,表面更光滑平整。稀土的加入有利于细化晶粒。展开更多
研究了化学镀Ni W P SiC复合镀层的孔隙率。结果表明,镀液温度和施镀时间对镀层孔隙率的影响较大,在镀液T=80℃、施镀时间t=2.5h时所得镀层的孔隙率较小;热处理温度和时间对镀层孔隙率有一定影响,热处理温度为400℃,时间为3h时,镀层... 研究了化学镀Ni W P SiC复合镀层的孔隙率。结果表明,镀液温度和施镀时间对镀层孔隙率的影响较大,在镀液T=80℃、施镀时间t=2.5h时所得镀层的孔隙率较小;热处理温度和时间对镀层孔隙率有一定影响,热处理温度为400℃,时间为3h时,镀层孔隙率最小。展开更多
文摘To solve the greasiness and irritation risks brought about by organic sun-screening agents in sunscreen emulsions,in this work,a sunscreen O/W/Si multiple emulsion was prepared by two-step emulsification method,in which the outer oil phase was silicone oil and the inner oil phase was solid lipid nanoparticles coated with organic sun-screening agent.Several influencing factors on the formation and stability of the emulsion were analyzed,including inorganic salts,the volume fraction of outer oil phase(silicone oil),and the dosage of W/O emulsifier.The in vitro sunscreen performance,water resistance and skin permeability of different types of sunscreen emulsions were further studied.The results showed that the sunscreen O/W/Si multiple emulsion containing 22.5%silicone oil,2.5%emulsifier and 0.2%NaCl had the best stability under the experimental conditions.The SPF value and water resistance of sunscreen O/W/Si multiple emulsion were slightly higher than those of sunscreen W/O emulsion,but significantly higher than those of sunscreen O/W emulsion.Compared with sunscreen W/O emulsion,the in vitro transdermal permeability of organic sun-screening agent in sunscreen O/W/Si multiple emulsion was reduced by approximately 60%,indicative of higher safety and good application prospect in sunscreen cosmetics.
文摘研究了RE Ni W P SiC PTFE复合镀层的抗氧化性。结果表明 :RE Ni W P SiC PTFE复合镀层随着氧化温度的升高 ,氧化膜的重量增加 ,但在 80 0°C以下氧化温度对镀层的增重不显著 ;80 0°C以上 ,镀层的增重迅速增加。通过对三种镀层抗氧化性能的比较可知 ,RE Ni W P SiC PTFE镀层的抗氧化性不如Ni W P、Ni W P SiC及RE Ni W P SiC三种镀层好。
文摘研究了脉冲电沉积Ni W P SiC复合电镀工艺。研究表明 :Ni W P SiC镀层的脉冲电沉积速率比直流电沉积的大 ,脉冲镀层的耐蚀性和硬度都优于直流镀层 ,耐蚀性还优于 1Cr18Ni9Ti不锈钢 ;脉冲频率和占空比对镀层的沉积速率、镀层成分以及镀层的性能都有很大的影响。SEM观察表明 ,脉冲镀层比直流镀层的结晶更细密 ,表面更光滑平整。
文摘研究了RE Ni W P SiC复合镀层的脉冲电沉积工艺。结果表明:RE Ni W P SiC镀层的脉冲电沉积速率比直流电沉积大,脉冲镀层的耐蚀性和硬度都优于直流镀层,耐蚀性优于1Cr18Ni9Ti不锈钢;脉冲频率和占空比对镀层的沉积速率、镀层成分以及镀层的性能都有很大影响。脉冲镀层比直流镀层的结晶更细密,表面更光滑平整。稀土的加入有利于细化晶粒。
