A method of making an electret article, from a polymeric article that has a zeta potential of greater than or less than −7.5 millivolts. The article is charged by contacting it with an aqueous liquid that has a pH and conductivity as follows: (i) if the article has a zeta potential of −7.5 mV or less, then the contacting liquid has pH greater than 7 and a conductivity of 5 to 9,000 microSiemens per centimeter; and (ii) if the article has a zeta potential of greater than −7.5 mV, then the contacting liquid has a pH of 7 or less and a conductivity of 5 to 5,500 microSiemens per centimeter. An electret article made in this manner can provide improved electret performance, particularly in electret filtration articles.
                            一种制造静电纤维的方法,使用具有大于或小于-7.5毫伏的ζ电位的聚合物纤维。将该纤维与具有以下pH和电导率的
水性液体接触,以使纤维带电:(i)如果纤维的ζ电位小于或等于-7.5毫伏,则接触液体的pH大于7,电导率为5至9,000微西门子/厘米;(ii)如果纤维的ζ电位大于-7.5毫伏,则接触液体的pH为7或更低,电导率为5至5,500微西门子/厘米。使用这种方法制造的静电纤维可以提供改进的静电性能,特别是在静电过滤器中。