scholarly journals A microfluidic method to measure bulging heights for bulge testing of polydimethylsiloxane (PDMS) and polyurethane (PU) elastomeric membranes

RSC Advances ◽  
2018 ◽  
Vol 8 (38) ◽  
pp. 21133-21138 ◽  
Author(s):  
Jen-Huang Huang ◽  
Kiersten Haffey ◽  
Ayesha Arefin ◽  
Leyla E. Akhadov ◽  
Jennifer F. Harris ◽  
...  
Keyword(s):  
Polymeric Membranes ◽  
Microfluidic Platform ◽  
Bulge Testing

A unique microfluidic platform to rapidly and accurately measure the bulging heights of polymeric membranes.

SEM/FESEM imaging of lamellar structures in melt extruded polyethylene films

1992 ◽  
Vol 50 (2) ◽  
pp. 1142-1143
Author(s):  
R.T. Chen ◽  
M.G. Jamieson ◽  
R. Callahan
Keyword(s):  
Imaging Techniques ◽  
Membrane Surface ◽  
High Stress ◽  
Extrusion Direction ◽  
Polymeric Membranes ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Crystalline Polymers ◽  
Lamellar Structures ◽  
Resolution Imaging

“Row lamellar” structures have previously been observed when highly crystalline polymers are melt-extruded and recrystallized under high stress. With annealing to perfect the stacked lamellar superstructure and subsequent stretching in the machine (extrusion) direction, slit-like micropores form between the stacked lamellae. This process has been adopted to produce polymeric membranes on a commercial scale with controlled microporous structures. In order to produce the desired pore morphology, row lamellar structures must be established in the membrane precursors, i.e., as-extruded and annealed polymer films or hollow fibers. Due to the lack of pronounced surface topography, the lamellar structures have typically been investigated by replica-TEM, an indirect and time consuming procedure. Recently, with the availability of high resolution imaging techniques such as scanning tunneling microscopy (STM) and field emission scanning electron microscopy (FESEM), the microporous structures on the membrane surface as well as lamellar structures in the precursors can be directly examined.The materials investigated are Celgard® polyethylene (PE) flat sheet membranes and their film precursors, both as-extruded and annealed, made at different extrusion rates (E.R.).

Low-voltage field-emission SEM of polymeric membranes for glucose biosensors

1990 ◽  
Vol 48 (3) ◽  
pp. 860-861
Author(s):  
Lorna K. Mayo ◽  
Kenneth C. Moore ◽  
Mark A. Arnold
Keyword(s):  
Glucose Sensor ◽  
Low Voltage ◽  
Glucose Sensors ◽  
Polymeric Membranes ◽  
Artificial Endocrine Pancreas ◽  
Self Monitoring ◽  
Conducting Materials ◽  
Insulin Dependent ◽  
Living Tissues ◽  
Voltage Scanning

An implantable artificial endocrine pancreas consisting of a glucose sensor and a closed-loop insulin delivery system could potentially replace the need for glucose self-monitoring and regulation among insulin dependent diabetics. Achieving such a break through largely depends on the development of an appropriate, biocompatible membrane for the sensor. Biocompatibility is crucial since changes in the glucose sensors membrane resulting from attack by orinter action with living tissues can interfere with sensor reliability and accuracy. If such interactions can be understood, however, compensations can be made for their effects. Current polymer technology offers several possible membranes that meet the unique chemical dynamics required of a glucose sensor. Two of the most promising polymer membranes are polytetrafluoroethylene (PTFE) and silicone (Si). Low-voltage scanning electron microscopy, which is an excellent technique for characterizing a variety of polymeric and non-conducting materials, 27 was applied to the examination of experimental sensor membranes.

Column: Polymeric Membranes

Polymer News ◽  
2004 ◽  
Vol 29 (8) ◽  
pp. 253-257
Author(s):  
Tejraj Aminabhavi ◽  
Udaya Toti ◽  
Mahaveer Kurkuri ◽  
Nadagouda Mallikarjuna ◽  
Lakshmi Shetti
Keyword(s):  
Polymeric Membranes

Solutocapillary-convection-driven macrovoid defect formation in polymeric membranes

2001 ◽  
Author(s):  
J. Zartman ◽  
V. Khare ◽  
A. Greenberg ◽  
M. Pekny ◽  
P. Todd ◽  
...  
Keyword(s):  
Defect Formation ◽  
Polymeric Membranes

Fouling Is the Beginning: Upcycling Biopolymer-Fouled Substrates for Fabricating High-Permeance Thin-Film Composite Polyamide Membranes

2020 ◽  
Author(s):  
Ruobin Dai ◽  
Hongyi Han ◽  
Tianlin Wang ◽  
Jiayi Li ◽  
Chuyang Y. Tang ◽  
...  
Keyword(s):  
Thin Film ◽  
High Pressure ◽  
End Of Life ◽  
Water Purification ◽  
Low Pressure ◽  
Polymeric Membranes ◽  
Membrane Recycling ◽  
Film Composite ◽  
Thin Film Composite ◽  
First Time

Commercial polymeric membranes are generally recognized to have low sustainability as membranes need to be replaced and abandoned after reaching the end of their life. At present, only techniques for downcycling end-of-life high-pressure membranes are available. For the first time, this study paves the way for upcycling fouled/end-of-life low-pressure membranes to fabricate new high-pressure membranes for water purification, forming a closed eco-loop of membrane recycling with significantly improved sustainability.

ASPECTS ON POLYMER-SOLVENT EQUILIBRIUM AND DIFFUSION IN POLYMERIC MEMBRANES

2013 ◽  
Vol 12 (8) ◽  
pp. 1583-1591 ◽  
Author(s):  
Eugenia Teodora Iacob Tudose Ioan Mamaliga ◽  
Ciprian Constantin Negoescu ◽  
Nicoleta Bunduc
Keyword(s):  
Polymeric Membranes ◽  
And Diffusion ◽  
Polymer Solvent

Surface Modification of Synthetic Polymeric Membranes for Filtration and Gas Separation

2010 ◽  
Vol 3 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Kailash Ch. Khulbe ◽  
Chaoyang Y. Feng ◽  
Takeshi Matsuura
Keyword(s):  
Surface Modification ◽  
Gas Separation ◽  
Polymeric Membranes

Recent Advances in Polymeric Membranes for Pressure Driven Applications

2011 ◽  
Vol 3 (3) ◽  
pp. 195-207
Author(s):  
Tapan K. Dey ◽  
Shivaraman Prabhakar ◽  
Pradip K. Tewari
Keyword(s):  
Polymeric Membranes ◽  
Recent Advances ◽  
Pressure Driven

scholarly journals A Microfluidic Platform to design Multimodal PEG - crosslinked Hyaluronic Acid Nanoparticles (PEG-cHANPs) for diagnostic applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Olimpia Tammaro ◽  
Angela Costagliola di Polidoro ◽  
Eugenia Romano ◽  
Paolo Antonio Netti ◽  
Enza Torino
Keyword(s):  
Hyaluronic Acid ◽  
Microfluidic Platform ◽  
Diagnostic Applications
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