@article {Hu:December 2008:0149-6395:4030,
	author = "Hu, Ling",
	author = "Xu, Xinglong",
	author = "Coleman, Maria",
	title = "Effect of H+ and N+ Irradiation on Structure and Permeability of the Polyimide Matrimid",
	journal = "Separation Science and Technology",
	volume = "43",
	year = "December 2008",
	abstract = "This paper presents a comparison of the impact of H+ and N+ ion irradiation on the chemical structure, microstructure, and gas permeation properites of the polyimide, Matrimid®. While irradiation with both ions resulted in evolution of chemical structure with loss of functional groups and crosslink formation, there was greater modification of polyimide structure following N+ irradiation at similar total deposited energy. Irradiation with N+ resulted in simultaneous large increases in permeance and permselectivity at comparatively low ion fluences or irradiation time. For example, irradiation at 4 × 1014 N+/cm2 resulted in a 2.5 fold increase in He permeance with a selectivity of He/CH4 of 340. Much higher H+ fluences were required to achieve similar total deposited energy and combined increases in permeance and permselectivity. The larger modification in chemical structure and gas permeation properties following N+ irradiation was attributed to the relatively large energy loss and damage from the nuclear energy relative to electronic energy loss.",
	pages = "4030-4055(26)",
	url = "http://www.ingentaconnect.com/content/tandf/lsst/2008/00000043/00000016/art00006"
	doi = "doi:10.1080/01496390802414734"
}