Accession Number : ADA119793

Title :   Micrographic Observations of the Carbonaceous Mesophase by a Quenching Hot Stage.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB

Personal Author(s) : White,Jack L ; Buechler,Manfred ; Ng,Cassandra B

PDF Url : ADA119793

Report Date : 30 Aug 1982

Pagination or Media Count : 11

Abstract : A hot-stage microscope with quenching capability was employed to relate the observations made at the free surface of a pitch during pyrolysis to the bulk microstructure. Freshly formed mesophase spherules display an 'iceberg effect' with only a limited upper segment exposed to view. The mesophase layers tend to lie normal to the free surface, and + or - 2 Pi as well as + or - Pi disclinations display discontinuous cores at the free surface; aside from these minor effects, surface observations appear to be representative of events taking place within the bulk mesophase. (Author)

Descriptors :   *Liquid crystals, *Quenching, *Microstructure, Microscopes, Petroleum products, Layers, Pyrolysis, Cores, Hot working

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE