Influence Factors On Etching Rate Of PET Nuclear Pore Membrane

The nuclear pore membrane is a kind of new material which was manufacturedby irradiation technology and chemical etching. This paper researched the preparationand application aspects of the nuclear pore membrane at home and abroad, cleared thehistory and research status of the nuclear pore membrane. Aimed at the technicalcharacteristics and application range of nuclear pore membrane in China Institute ofAtomic Energy Nuclear Physics Technology R&D Center, the mathematical modelof the pore shape changes has been established, and experimental verification of theapplicability of the mathematical model has been finished. This work discussed theimpact of etching factors on the etching rate, established empirical formula tocalculate the pore size of nuclear pore membrane firstly, provided data support forproducing high-quality nuclear pore membrane. Discussed the impact of the incidention energy of32S on the etch rate, defined the optimum radiation particle energy informing cylindrical pores. In the liquid nitrogen environment sectional sample ofnuclear pore membrane prepared. An intuitive description of the information of porechannels was present by observing under a scanning electron microscope.This work describes the use of HI-13Tandem Accelerator beam at lowtemperature and vacuum conditions irradiated five-layer PET film, the irradiationparameters is calculated by SRIM including the initial energy of each film and theaverage rate of energy loss along the ion path. Films was sensitized3hours under UVlight and etched with different concentrations and temperature of etching solution.Utilizing conductivity measurement technique, the electrical current changes throughthe irradiated PET film were monitored during etching, from which the breakthroughtime and therefore the track etching rate Vtwas calculated then the bulk etching rateobtained by weighing method. The results show that there is an exponentialcorrelation between etch rate and temperature, and a linear correlation between etchrate and concentration. The track etching rate increases linearly with energy loss rate.Empirical formula for the bulk etching rate as a function of etchant concentration andtemperature were also established via fitting of measurements. It is concluded that byusing1.6MeV/u32S ions, PET nuclear pore membrane with cylindrical pore shapecan be prepared at an etchant concentration of1mol/L and a temperature of85℃.Thegrowth of the pore diameter in theoretical derivation has been completed and aempirical formula about figure out the diameter of the pore has been got. The datecalculated by the formula equation with the experimental obtained. The shape ofmicropores expanded from conical to cylindrical in the case of large values of the ratio of Vtand Vb, however the pore shape changed from conical to Ellipsoid shapewhen small values of the ratio of Vtand Vb. We found morphological changes of thepores through observing the cross-section samples by scanning electron microscopywhich stopping etch at different times.Deducing the theoretical model of pore shape change and studying the factorsaffecting the etching rate in this work have a great significance in guiding theproduction of PET nuclear pore membrane. On the one hand provided valuable datafor the preparation of new materials irradiate by ion beam; On the other hand selectedthe appropriate etching conditions based on actual demand, would get the nuclearpore membrane with expected pore size and pore shape. The study of Influence on theradiation energy help to understand the interaction of ions with solid, such as energyloss process, damage-produced and impacts on etch rate.