Alketa K Gjoka

20100320142, Dec 23, 2010

Mar 28, 2007

12/295727

Jijun Ge - Boxborough MA, US
Alketa Gjoka - Malden MA, US

B01D 71/06
B01J 19/08

21050027, 204164, 204169

Versions of the invention include compositions and methods for making them that include a polymeric porous membrane with one or more atmospheric pressure microwave plasma modified surfaces. The modified porous membrane is stable, non-dewetting, and retains its mechanical strength.

20120118816, May 17, 2012

Mar 31, 2010

13/262743

Alketa Gjoka - Medford MA, US
Ven Anantha Raman - Salem NH, US
Matthias Gebert - Aachen, DE
Claudio Oldani - Herviamo, IT
Alessandro Ghielmi - Frankfurt Am Main, DE

Entegris, Inc. - Billerica MA

B01D 39/00
C09D 7/12

210506, 10628728, 10628723

Microporous membrane composites that are non-dewetting are disclosed. These microporous membrane composites are wet with solutions of methanol and water and are non-dewetting following autoclave treatment in water. The microporous membrane composites comprise a microporous membrane support that is coated with a crosslinked ionomer comprising hydrophilic groups. Compared to the microporous membrane support, the microporous membrane composite has a flow loss on average in isopropyl alcohol of less than 82%.

20140048476, Feb 20, 2014

Oct 30, 2013

14/067887

Alketa Gjoka - Medford MA, US

Entegris, Inc. - Billerica MA

B01D 71/36

210490, 210489

Versions of the invention include compositions and methods for making them that include a polymeric porous membrane with one or more atmospheric pressure microwave plasma modified surfaces. The modified porous membrane is stable, non-dewetting, and retains its mechanical strength.

20180290109, Oct 11, 2018

Nov 19, 2015

15/527094

- Billerica MA, US
Alketa GJOKA - Billerica MA, US

B01D 71/26
B01D 69/02
B01D 71/78
B01D 67/00

Grafted, asymmetric, porous, ultra high molecular weight polyethylene membranes having a bubble point between about 5.38 bar (78 psi) and 11.03 bar (160 psi) are disclosed. Monomers are grafted to the porous polymeric membrane surfaces, the monomers having one or more of neutral groups or ion exchange groups grafted to one or more surfaces of the membrane. A combination of two photoinitiators can be used to graft the monomers to the asymmetric, porous, ultra high molecular weight membrane resulting in grafted microporous membranes that have water flow rates that are at least 50% of the water flow rate of an ungrafted, asymmetric, porous ultra high molecular weight polyethylene membrane. The grafted membrane also wets in water.

20180185835, Jul 5, 2018

Nov 19, 2015

15/738969

- Billerica MA, US
Alketa Gjoka - Billerica MA, US
Saksatha Ly - Billerica MA, US

B01J 47/12
C08G 81/02
C08J 5/22
C08J 7/12
B01J 41/07
B01J 41/13
B01J 39/05
B01J 39/19
B01D 71/78
B01D 71/68
B01D 67/00
B01D 69/02

A polysulfone membrane is modified so that monomers are grafted onto the surface of the membrane. The polysulfone membranes can be grafted by contacting the membrane with a grafting solution and exposing the membrane to electromagnetic radiation, typically within the ultraviolet portion of the spectrum. The monomers that are grafted are typically anionic or cationic. The grafted membranes can be used for filtering impurities, such as positively and negatively charged particles, from a liquid. Anionic membranes provide improved filtration of negatively charged impurities, while cationic membranes provide improved filtration of positively charged impurities.