Analysis of membrane track filters during operation

Changes in the properties of a FiTreM track membrane filter with a pore diameter of 0.45 μm during water filtration and changes in filtration rates during continuous water filtration were studied. The decrease in filtration rates during the passage of distilled water through a track membrane filter is explained by the compaction of the filter and the change in membrane permeability due to the accumulation of a negative charge on the pore surface due to the dissociation of COOH groups.

STUDY OF THE STRUCTURE AND OPTICAL DENSITY OF POLYIMIDE TRACK (NUCLEAR) MEMBRANE

The paper presents the results of a study of the surface and optical properties of the PM-1 polyimide film and the polyimide track membrane. For the study, polyimide (track) nuclear membranes manufactured by ION TRACK TECHNOLOGY FOR INNOVATIVE PRODUCT (it4ip, Belgium)) is used. The pore diameter is 200 nm, the pore density is 5 • 108 cm-1, and the thickness of the polyimide membrane is 25 μm. The data of IR spectroscopy are presented. It is shown that the decrease in the intensity of the peaks of the IR spectra of the membrane compared to the film is a consequence of the oxidative degradation of the polyimide after exposure to heavy ions and chemical etching. The data on the effects of heavy ion irradiation and chemical etching of a polyimide film to obtain a membrane on surface hydrophobicity / hydrophilicity are presented. The optical density of the film and track membranes is determined in the wavelength range of 350-950 nm. The optical density is measured in increments of 50 nm. It is shown that despite the strong difference in the spectral dependence of the optical density of the polyimide film and the track membrane, the optical density of the PM-1 film and the track membrane is quite low in the entire studied wavelength range and does not exceed 0.26 and 0.42, respectively.

Debonding of metal coating of a track-etched membrane

Behavior of metallic nano-coating of the track membrane based on polyethylene terephthalate film under tension was investigated. In the vicinity of cracks in the coating, conical-shaped debondings of the coatings were observed. Debondings have the form of sharp cones, elongated along the tension axis and perpendicular to the cracks. Nanopores initiate multiple cracking of the coating, and the cracks initiate local debondings. Short microcracks mutually suppress their growth. As a result, long cracks crossing the entire coating do not appear. As a result, the coating retains its continuity and conducts electric current.

Study of Structure and Optical Density of Track Membranes

This work presents research results of surface, including optical characteristics of poly (ethylene terephthalate) film under the influence of heavy ion radiation and following chemical etching for use as light filter. The optical density of the films and track membranes was determined in the wavelength range of 310-990 nm. Optical density measurements were carried out with gap of 50 nm. Track membrane was researched with the track diameters of 300 nm and concentration of 4·108см-1. It is determined, that the optical density of the initial film and irradiated are comparatively low in the entire researched wavelength range and does not exceed the value of 0.1. It is shown that for the track membrane in the ultraviolet region there is a sharp rise in the optical density values, at the wavelength of 650 nm to the maximum value, and the values gradually decrease in visible color and continue to decrease in the IR region.

Экстракция ионов из полярного раствора с использованием поверхностно-модифицированного мембранного интерфейса

The possibility of field extraction of ions from a polar solution was demonstrated using a polymer track membrane with a conductive coating as an interface. The time-of-flight spectrum of ions extracted from a KI solution in a water-glycerin mixture by a nanosecond electric field pulse was obtained. The use of a conductive coating made it possible to significantly lower the voltage of the extracting pulse and reduce the influence of secondary processes on the composition of ions generated in a pulsed membrane ion source.