evaluation of vapor deposition techniques for membrane pore size modification
نویسندگان
چکیده
the suitability of three vapor deposition techniques for pore size modification was evaluated using polycarbonate track etched membranes as model supports. a feature scale model was employed to predict the pore geometry after modification and the resulting pure water flux. physical vapor deposition (pvd) and pulsed plasma-enhanced chemical vapor deposition (pecvd), naturally, form asymmetric nanopores that retain high flux as pore size is reduced. but pvd-modified supports exhibited poor control and reproducibility. in contrast, pulsed pecvd and plasma-enhanced atomic layer deposition (peald) were shown to deliver digital control over pore size. moreover, good agreement was obtained between model predictions and flux measurements. exposure limitations during peald introduce a degree of asymmetry, though net growth rates were 1-2 orders of magnitude smaller than pulsed pecvd and pvd. filtration experiments using bovine serum albumin as a model solute showed that pulsed pecvd-modified membranes can be engineered to simultaneously deliver both high flux and high selectivity. for example, pulsed pecvd-modified supports were demonstrated to deliver high retention (~ 75%) while maintaining 70% of their initial pure water flux.
منابع مشابه
Evaluation of Vapor Deposition Techniques for Membrane Pore Size Modification
The suitability of three vapor deposition techniques for pore size modification was evaluated using polycarbonate track etched membranes as model supports. A feature scale model was employed to predict the pore geometry after modification and the resulting pure water flux. Physical vapor deposition (PVD) and pulsed plasma-enhanced chemical vapor deposition (PECVD), naturally, form asymmetric na...
متن کاملA portable quartz micro balance for physical vapor deposition techniques.
A portable quartz crystal micro balance for physical vapor deposition techniques is presented. The device is used for the calibration of evaporators employed in the preparation of thin film systems that are studied in surface science. The design is based upon a portable sample setup, highly versatile and customizable. It can be transported within an ultrahigh vacuum system, stored in a sample g...
متن کاملmodification of nanoclay for improving the physico-mechanical properties of dental adhesives
هدف اصلی این مطالعه تهیه یک سامانه نوین چسب عاجی دندانی بر پایه نانورس پیوند شده با پلی متاکریلیک اسید، نانورس پیوند شده با پلی اکریلیک اسید، مخلوط نانوسیلیکا و نانورس پیوند شده با پلی متاکریلیک اسید، مخلوط نانوسیلیکا و نانورس پیوند شده با پلی اکریلیک اسید و نانورس پیوند شده با کیتوسان اصلاح شده با گلایسیدیل متاکریلات است. پیوند پلی متاکریلیک اسید و پلی اکریلیک اسید بر ری سطح نانورس در حضور و ...
Optimized Conditions for Catalytic Chemical Vapor Deposition of Vertically Aligned Carbon Nanotubes
Here, we have synthesized vertically aligned carbon nanotubes (VA-CNTs), using chemical vapor deposition (CVD) method. Cobalt and ethanol are used as the catalyst and the carbon source, respectively. The effects of ethanol flow rate, thickness of Co catalyst film, and growth time on the properties of the carbon nanotube growth are investigated. The results show that the flow rate of ethanol and...
متن کاملAn Optimum Routine for Surface Modification of Ceramic Supports to Facilitate Deposition of Defect-Free Overlaying Micro and Meso (Nano) Porous Membrane
In this work, a simple and effective way to modify the support surface is developed and a nanostructure ceramic support to facilitate deposition of a defect-free overlying micro and meso (nano) porous membrane is obtained. To achieve high performance nanocomposite membranes, average pore size of outer surface of support was reduced by dip-coating in submicron and nano α-alumina slurries. In...
متن کاملEffect of Ethylene Glycol as Pore Former on Polyphenylsulfone Hollow Fiber Membrane for Crude Palm Oil Deacidification through Membrane Contactor
In this study, polyphenylsulfone (PPSU) hollow fiber membrane was fabricated via a wet spinning method with the addition of ethylene glycol (EG) in the range of 0-10 wt% as the additive. The EG was added to improve the membrane pore formation and interconnectivity for better membrane contactor performance in extracting and removing the free fatty acid (FFA) from crude palm oil (CPO). Four diffe...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
journal of membrane science and researchجلد ۳، شماره ۲، صفحات ۶۴-۷۰
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023