Nanofilter for hydrogen purification

Vijay, Y.K.; Acharya, N.K.; Wate, S.; Avasthi, D.K.

doi:10.1016/s0360-3199(02)00166-0

Cited by 31 publications

(20 citation statements)

References 6 publications

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“…The ion fluence also alters gas permeation rate. The higher fluence membranes having less critical etching time than the lower fluence membranes due to variation in the number of tracks that are overlapped [17]. In case of 18μm thick membrane, the critical etching time for 10 8 ions/cm 2 irradiated membrane is found to be 2 minute, whereas for 10 6 ions/cm 2 irradiated membrane it is found to be 4 minutes.…”

Section: Resultsmentioning

confidence: 91%

“…The polymers were obtained in granular form and membranes of varying thickness from 1 to 50 μm were prepared by solution cast method [17]. The swift heavy ion irradiation was performed in General Purpose Scattering Chamber (GPSC) at Inter University Accelerator Center, New Delhi under high vacuum of 10 -6 torr [18].…”

Section: Irradiationmentioning

confidence: 99%

“…A 38 mm diameter membrane with porous support was placed in the cell. The details are given elsewhere [23].…”

Section: Gas Permeabilitymentioning

confidence: 99%

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SHI induced nano track polymer filters and characterization

Vijay

2009

Indian J Phys

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Swift heavy ion irradiation produces damage in polymers in the form of latent tracks. Latent tracks can be enlarged by etching it in a suitable etchant and thus nuclear track etch membrane can be formed for gas permeation / purification in particular for hydrogen where the molecular size is very small. By applying suitable and controlled etching conditions well defined tracks can be formed for specific applications of the membranes. After etching gas permeation method is used for characterizing the tracks. In the present work polycarbonate (PC) of various thickness were irradiated with energetic ion beam at Inter University Accelerator Centre (IUAC), New Delhi. Nuclear tracks were modified by etching the PC in 6N NaOH at 60 (±1) o C from both sides for different times to produce track etch membranes. At critical etch time the etched pits from both the sides meet a rapid increase in gas permeation was observed. Permeability of hydrogen and carbon dioxide has been measured in samples etched for different times. The latent tracks produced by SHI irradiation in the track etch membranes show enhancement of free volume of the polymer. Nano filters are separation devices for the mixture of gases, different ions in the solution and isotopes and isobars separations. The polymer thin films with controlled porosity finding it self as best choice. However, the permeability and selectivity of these polymer based membrane filters are very important at the nano scale separation. The Swift Heavy Ion (SHI) induced nuclear track etched polymeric films with controlled etching have been attempted and characterized as nano scale filters.

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Section: Resultsmentioning

confidence: 91%

Section: Irradiationmentioning

confidence: 99%

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SHI induced nano track polymer filters and characterization

Vijay

2009

Indian J Phys

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“…The irradiated membranes were etched for less etching time is used for gas filters, through that a particular gas passes and the others were rejected, so the tracks have several nm size [7]. These tracks can be enlarged by employing extended chemical etching.…”

Section: Resultsmentioning

confidence: 99%

Microscopic Observation of Nuclear Track Pores in Polymeric Membranes

Acharya¹

2011

ENG

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Nuclear track pores were develop and observed in polycarbonate and LR-115 membranes. The polymer membranes were irradiated by swift heavy ions (SHI) and etched chemically. The stopping range of heavy ion is larger than the thickness of the membrane. The fluence of ions was changes from 10 3 to 10 7 ions-cm −2 . The etching time was increased till pore size reaches up to micron range. The etching conditions were set to develop the porous tracks. The tracks are revealed under optical microscope as the size reaches up to micron or sub-micron size. The size was measured using standard electron diffraction grid. Results show that the porous tracks having average size of 2.4 micron can be developed in polycarbonate, while 5 -10 micron porous tracks can be developed in LR-115.

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“…The detail of solution cast method has been discussed elsewhere [7]. The membranes were dried in low vacuum at 60 • C for 24 h to remove the solvent completely.…”

Section: Membrane Preparationmentioning

confidence: 99%