Microchip Dialysis of Proteins Using in Situ Photopatterned Nanoporous Polymer Membranes

2004 ◽  
Vol 76 (8) ◽  
pp. 2367-2373 ◽  
Author(s):  
Simon Song ◽  
Anup K. Singh ◽  
Timothy J. Shepodd ◽  
Brian J. Kirby
Keyword(s):  
Polymer Membranes

scholarly journals Ex-Situ Evaluation of Commercial Polymer Membranes for Vanadium Redox Flow Batteries (VRFBs)

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 926
Author(s):  
Nana Zhao ◽  
Harry Riley ◽  
Chaojie Song ◽  
Zhengming Jiang ◽  
Keh-Chyun Tsay ◽  
...  
Keyword(s):  
Large Scale ◽  
Polymer Membranes ◽  
Ex Situ ◽  
Anion Exchange Membranes ◽  
In Situ Testing ◽  
Ionic Charge ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

Polymer membranes play a vital role in vanadium redox flow batteries (VRFBs), acting as a separator between the two compartments, an electronic insulator for maintaining electrical neutrality of the cell, and an ionic conductor for allowing the transport of ionic charge carriers. It is a major influencer of VRFB performance, but also identified as one of the major factors limiting the large-scale implementation of VRFB technology in energy storage applications due to its cost and durability. In this work, five (5) high-priority characteristics of membranes related to VRFB performance were selected as major considerable factors for membrane screening before in-situ testing. Eight (8) state-of-the-art of commercially available ion exchange membranes (IEMs) were specifically selected, evaluated and compared by a set of ex-situ assessment approaches to determine the possibility of the membranes applied for VRFB. The results recommend perfluorosulfonic acid (PFSA) membranes and hydrocarbon anion exchange membranes (AEMs) as the candidates for further in-situ testing, while one hydrocarbon cation exchange membrane (CEM) is not recommended for VRFB application due to its relatively high VO2+ ion crossover and low mechanical stability during/after the chemical stability test. This work could provide VRFB researchers and industry a valuable reference for selecting the polymer membrane materials before VRFB in-situ testing.

Compliant and Low-Cost Humidity Sensors Using Nano-Porous Polymer Membranes

2004 ◽  
Author(s):  
Bozhi Yang ◽  
Burak Aksak ◽  
Shan Liu ◽  
Qiao Lin ◽  
Metin Sitti
Keyword(s):  
Relative Humidity ◽  
Room Temperature ◽  
Capillary Condensation ◽  
Low Cost ◽  
Polymer Membranes ◽  
High Sensitivity ◽  
Porous Polymer ◽  
Humidity Sensors ◽  
Water Leakage Detection

This paper proposes non-fragile compliant humidity sensors that can be fabricated inexpensively on various types of nano-porous polymer membranes such as polycarbonate, cellulose acetate, and nylon membranes. The sensor contains a pair of interdigitated electrodes deposited on the nano-porous polymer membranes. The resistance and/or capacitance between these electrodes vary at different humidity levels with a very high sensitivity due to the water adsorption (capillary condensation) inside the nano-pores. The proposed sensors are low-cost in both material and fabrication. Due to its compliance, the sensors can be suitable for certain applications such as in-situ water leakage detection on roofs, where people can walk on top of them. Testing results demonstrated that the sensor changes resistance within large range of humidity values. For most sensors, the resistance changes from 0.1 GΩ to 2000 GΩ when the relative humidity changes from 39% to 100% at room temperature. It takes about 4–8 minutes for the resistance to reach steady state when the sensor was taken from 100% to 39% relative humidity at the room temperature.

In Situ Doping of Metal Nanoparticles into Medical Polymer Membranes and Their Biomedical Application

2020 ◽  
Vol 5 (18) ◽  
pp. 5451-5459 ◽  
Author(s):  
Xiaoyun Li ◽  
Qi Wang ◽  
Yueqi Yu ◽  
Leyi Fang ◽  
Xingwen Wang ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Biomedical Application ◽  
Polymer Membranes ◽  
Medical Polymer

In situ knitted microporous polymer membranes for efficient CO2 capture

2021 ◽  
Author(s):  
Yingzhen Wu ◽  
Na Xing ◽  
Sen Li ◽  
Leixin Yang ◽  
Yanxiong Ren ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Network Structure ◽  
Polymer Membranes ◽  
Microporous Polymer

We proposed an in situ knitting approach to engineering the network structure of microporous polymer membranes for synergistic optimization of gas permeance, CO2 selectivity and stability.

In-situ generation of polymer molecular sieves in polymer membranes for highly selective gas separation

2021 ◽  
Vol 630 ◽  
pp. 119302
Author(s):  
Menghui Huang ◽  
Zhenggong Wang ◽  
Kuan Lu ◽  
Wangxi Fang ◽  
Xiangyu Bi ◽  
...  
Keyword(s):  
Gas Separation ◽  
Molecular Sieves ◽  
Polymer Membranes ◽  
In Situ Generation

In Situ Formation of Porous Molecularly Imprinted Polymer Membranes

2003 ◽  
Vol 36 (19) ◽  
pp. 7352-7357 ◽  
Author(s):  
Tatiana A. Sergeyeva ◽  
Sergey A. Piletsky ◽  
Elena V. Piletska ◽  
Olexander O. Brovko ◽  
Lyudmila V. Karabanova ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Polymer Membranes ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
In Situ Formation

Enhanced contrast SEI/TEM of polymer membranes

1984 ◽  
Vol 42 ◽  
pp. 384-385
Author(s):  
L. C. Sawyer
Keyword(s):  
Cross Sections ◽  
Three Dimensional ◽  
Polymer Membranes ◽  
Structure Characterization ◽  
Dimensional Structure ◽  
Specimen Preparation ◽  
Porous Films ◽  
Transmission Electron ◽  
Electron Imaging

Specimen preparation for the characterization of polymers requires special handling to ensure that the in situ structures are observed. In the case of polymer membranes the situation is more difficult than usual as these thin, porous films are delicate and may collapse upon drying. Standard embedding and microtomy are often not possible due to this soft, collapsable texture. When microtomy is successful the resulting sections usually exhibit poor contrast due to their low atomic number. Scanning electron microsopy (SEM) of fractured cross-sections often reveals collapsed textures. Surface analysis also has limited resolution. The subject of this paper is to describe the enhanced contrast methods developed for both the secondary electron imaging (SEI) and transmission electron microscopy (TEM) of polymer membranes for three dimensional structure characterization.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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