Plasma chemical modification of track-etched membrane surface layer for improvement of their biomedical properties

Electrodialysis (ED) is an electrochemical process used for separation of ions across perm-selective membranes. ED uses a DC bias to selectively transport ions across membranes for applications ranging from desalination of water to demineralization of fruit juice. The energy cost of ED is due to accumulation of hydroxide and hydronium ions from the electrochemical process of water; additionally there is the cost of using platinum electrodes. This paper addresses the idea of using polycarbonate track etched membrane (PCTE) coated with gold between the membranes to reduce the energy cost and to explore a wider selection of electrode materials. This paper aims to show how thiol monolayers on gold can be used as ideal polarizable electrodes (electrode behaves like a capacitor with only charging current and no faradaic current) for application of potential to the membrane surface double layer. We report the characterization of such monolayers on gold-coated microscope slides. The goal is to control the diffuse layer potential at each membrane-solution interface while at the same time prevent adsorption on the electrode surface and minimize Faradaic activity due to electrolyte and redox species in solution. This lays the groundwork for the application of thiol-modified polycarbonate track-etched membranes for ion-selective transport. The paper proposes the use of electrochemical impedance spectroscopy (EIS) to measure characteristics of gold (Au)-coated membranes and their inherent limitations. In this work, the fabrication of a membrane permeate flow cell is described with the aim of subsequently studying the transport of ions through conductive polycarbonate track etched membrane (PCTE) by interrogating the system using EIS and CV measurements. In particular, we would like to ascertain the voltage range that can be applied to the Au-coated membrane without getting a considerable faradaic activity; the difference between platinum and Au electrode; the effects of different electrolyte concentrations and various applied DC potentials.

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Morphology and Contact Properties of Polytetrafluoroethylene-Like Films Deposited onto Track-Etched Membrane Surface in Vacuum

Plasma Physics and Technology Journal ◽

10.14311/ppt.2018.3.110 ◽

2018 ◽

Vol 5 (3) ◽

pp. 110-116 ◽

Cited By ~ 1

Author(s):

L. Kravets ◽

R. Gainutdinov ◽

A. Gilman ◽

M. Yablokov ◽

V. Satulu ◽

...

Keyword(s):

Electron Beam ◽

Membrane Surface ◽

Composite Membranes ◽

Water Contact ◽

Polymer Nanostructures ◽

Poly Ethylene Terephthalate ◽

Beam Sputtering ◽

Poly Ethylene ◽

Track Etched Membrane ◽

Etched Membrane

The surface morphology and wettability of nanoscale polytetraﬂuoroethylene-like ﬁlms deposited onto the surface of the poly(ethylene terephthalate) track-etched membrane by RF-magnetron and electron-beam sputtering of polytetraﬂuoroethylene in vacuum have been studied. It was shown that the morphology of ﬁlms formed with the use of these coating techniques varies considerably. This is due to the size of the deposited polymer nanostructures. The nanostructures produced by the electron-beam sputtering of polytetraﬂuoroethylene are much bigger in size. Investigation of the surface properties of the composite membranes obtained in these processes showns that the deposition of the polytetraﬂuoroethylene-like ﬁlm onto track-etched membrane leads to hydrophobization of its surface. The water contact angle for the composite membranes signiﬁcantly increases.<br /><br />

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Formation of hydrophobic polymer coatings on the track-etched membrane surface

Journal of Physics Conference Series ◽

10.1088/1742-6596/1954/1/012022 ◽

2021 ◽

Vol 1954 (1) ◽

pp. 012022

Author(s):

L I Kravets ◽

M A Yarmolenko ◽

R V Gainutdinov ◽

V Satulu ◽

B Mitu ◽

...

Keyword(s):

Membrane Surface ◽

Polymer Coatings ◽

Hydrophobic Polymer ◽

Track Etched Membrane ◽

Etched Membrane

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Plasma-Chemical Modification of Facing Composite Material on the Basis of Hollow Glass Microspheres with Decorative Protective Coating

Inorganic Materials Applied Research ◽

10.1134/s2075113319020072 ◽

2019 ◽

Vol 10 (2) ◽

pp. 445-450 ◽

Cited By ~ 2

Author(s):

D. O. Bondarenko ◽

V. V. Strokova ◽

T. I. Timoshenko ◽

I. V. Rozdol’skaya

Keyword(s):

Composite Material ◽

Chemical Modification ◽

Protective Coating ◽

Glass Microspheres ◽

Plasma Chemical ◽

Hollow Glass Microspheres ◽

Hollow Glass ◽

Decorative Protective Coating

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Enhanced continuous liquid interface production with track-etched membrane

Rapid Prototyping Journal ◽

10.1108/rpj-12-2017-0251 ◽

2019 ◽

Vol 25 (1) ◽

pp. 117-125 ◽

Cited By ~ 3

Author(s):

Wenxiong Lin ◽

Huagang Liu ◽

Haizhou Huang ◽

Jianhong Huang ◽

Kaiming Ruan ◽

...

Keyword(s):

Pure Oxygen ◽

Inhibition Layer ◽

High Permeability ◽

Content Type ◽

Oxygen Inhibition ◽

Speed Up ◽

Continuous Liquid Interface Production ◽

Track Etched Membrane ◽

Printing Speed ◽

Etched Membrane

PurposeThe purpose of this paper is to explore the possibility of an enhanced continuous liquid interface production (CLIP) with a porous track-etched membrane as the oxygen-permeable window, which is prepared by irradiating polyethylene terephthalate membranes with accelerated heavy ions. Design/methodology/approachExperimental approaches are carried out to characterize printing parameters of resins with different photo-initiator concentrations by a photo-polymerization matrix, to experimentally observe and theoretically fit the oxygen inhibition layer thickness during printing under conditions of pure oxygen and air, respectively, and to demonstrate the enhanced CLIP processes by using pure oxygen and air, respectively. FindingsOwing to the high permeability of track-etched membrane, CLIP process is demonstrated with printing speed up to 800 mm/h in the condition of pure oxygen, which matches well with the theoretically predicted maximum printing speed at difference light expose. Making a trade-off between printing speed and surface quality, maximum printing speed of 470 mm/h is also obtained even using air. As the oxygen inhibition layer created by air is thinner than that by pure oxygen, maximum speed cannot be simply increased by intensifying the light exposure as the case with pure oxygen. Originality/valueCLIP process is capable of building objects continuously instead of the traditional layer-by-layer manner, which enables tens of times improvement in printing speed. This work presents an enhanced CLIP process by first using a porous track-etched membrane to serve as the oxygen permeable window, in which a record printing speed up to 800 mm/h using pure oxygen is demonstrated. Owing to the high permeability of track-etched membrane, continuous process at a speed of 470 mm/h is also achieved even using air instead of pure oxygen, which is of significance for a compact robust high-speed 3D printer.

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