采用离子束切割技术进行纤维截面制样的研究  

Fiber Cross Section by Ion Milling

作　　者：沈雯怡 吕小宝[1] 何钦文 丁敏菊 杨茜璐[1] 郭洪玲 SHEN Wenyi;LÜXiaobao;HE Qinwen;DING Minju;YANG Qianlu;GUO Hongling(Institute of Forensic Science,Shanghai Public Security Bureau,Shanghai 200083,China;Institute of Forensic Science,Ministry of Public Security,Beijing 100038,China)

机构地区：[1]上海市公安局物证鉴定中心,上海200083 [2]公安部鉴定中心,北京100038

出　　处：《刑事技术》2023年第4期347-354,共8页Forensic Science and Technology

基　　金：刑事技术“双十计划”重点攻关项目(2021SSGG028)。

摘　　要：纤维为常见微量物证,高质量的纤维横截面形态能提供更多信息用于比对和生产工艺溯源,而获得清晰的横截面主要依赖于纤维截面制样技术。本文选取羊毛纤维作为研究对象建立了纤维的离子束切割方法,比较了7种固定剂对纤维包埋固化时间、样品固定情况、样品导热性和样品导电性的影响,系统考察了加速电压、切割时间、离子束摆动速度以及离子束摆动角度等关键参数对切割效果的影响,并对7种纤维依照优化后的制样方法进行截面切割。采用银浆丙酮溶液对羊毛、涤纶、空心涤纶、异形涤纶、尼龙、维纶、难燃纤维和ES纤维8种纤维进行固定,以4 V、2.5 h、3 r/min、±30°为切割条件进行切割,能获得较为满意的纤维横截面。在扫描电镜放大4000倍的条件下能清晰观察到光滑的纤维截面形态以及孔隙内壁的结构。本方法具有操作简便的特点,可应用于实际案件纤维物证的鉴定,为通过纤维截面特征区分相同种类、不同工艺纤维提供科学依据。Fiber is common trace material evidence.High-quality fi ber cross section shape can provide more information for comparison and production process traceability,and obtaining clear cross section mainly depends on fi ber section sample preparation technology.In this paper,the four conditions of seven kinds of fi ber fi xation were experimented,and the three parameters of ion milling were studied experimentally.The infl uence of key parameters such as accelerating voltage,cutting time,ion beam swing speed and ion beam swing angle on cutting effect was investigated;the section of 7 kinds of fi bers was cut according to the optimized sample preparation method.Using silver paste acetone solution to fi x 8 kinds of fi bers,such as wool,polyester,hollow polyester,profi led polyester,nylon,vinylon,fl ame retardant fi ber and ES fi ber,and cutting under 4 V,2.5 h,3 r/min,±30°cutting conditions,a relatively satisfactory fi ber cross-section can be obtained.Under the condition of scanning electron microscope magnifi cation of 4000 times,the smooth fi ber cross section morphology and the structure of pore inner wall can be clearly observed.This method has the characteristics of simple operation,and can be applied to forensic science,which provides scientific basis for identifying the fiber cross section,distinguishing the same kind of different technology fi ber.

关 键 词：理化检验 离子束切割 纤维截面 司法鉴定 

分 类 号：DF794.3[政治法律—诉讼法学]