Micromachining

Elliott, David J.

doi:10.1016/b978-0-12-237070-0.50013-3

Cited by 1 publication

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References 24 publications

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“…Three different meshes with three different pore sizes were used to study the pore sizes. Previous studies of etch depth per pulse vs fluence at 248 nm wavelength on PI ablation give some basic idea of the number of pulses and fluence required to perforate 25 μm membrane . At constant fluence, pore size remains almost constant with an increasing number of pulses, as shown in Figure .…”

Section: Resultsmentioning

confidence: 88%

Fabrication of pH-Responsive Polyimide Polyacrylic Acid Smart Gating Membranes: Ultrafast Method Using 248 nm Krypton Fluoride Excimer Laser

Patil

2021

ACS Appl. Mater. Interfaces

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pH-responsive smart gating membranes were developed using a two-step fabricating process. In the first step, a porous polyimide (PI) support membrane with ordered, regular, and welldefined pores was obtained with a 248 nm KrF excimer laser using a lithography technique. The porous membranes were then grafted with poly(acrylic acid) (PAAc) hydrogel by free radical polymerization using the same excimer laser. The number of pulses and frequency could be varied to obtain a range of water permeabilities. Permeability of membrane changed significantly due to swelling and deswelling of PAAc inside the pores at pH 7 and pH 3, respectively. These hydrogel networks were firmly grafted inside pores and remained mechanically intact even after using high pressure during permeability studies. PAAc grafting was confirmed using ATR-FTIR. PAAc hydrogel distribution inside membrane pores was analyzed using SEM and fluorescence microscopy. To quantify the amount of polymer grafted, TGA studies were carried out. Diffusion studies were also carried out using caffeine as a drug molecule to evaluate the application of membrane in drug delivery devices. The linear drug release profile obtained from the study confirmed the potential application of membrane for drug delivery purposes. Results obtained also suggest that the fabrication method developed is fast, efficient, solvent-free, and economical.

show abstract

Section: Resultsmentioning

confidence: 88%

Fabrication of pH-Responsive Polyimide Polyacrylic Acid Smart Gating Membranes: Ultrafast Method Using 248 nm Krypton Fluoride Excimer Laser

Patil

2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

Micromachining

Cited by 1 publication

References 24 publications

Fabrication of pH-Responsive Polyimide Polyacrylic Acid Smart Gating Membranes: Ultrafast Method Using 248 nm Krypton Fluoride Excimer Laser

Fabrication of pH-Responsive Polyimide Polyacrylic Acid Smart Gating Membranes: Ultrafast Method Using 248 nm Krypton Fluoride Excimer Laser

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