Syed R. Ahmed
Medical Practice in Wilmington, DE
License number
Delaware C7-0004190
Issued Date
Feb 9, 2009
Expiration Date
Mar 31, 2010
Category
Medical Practice
Type
ACGME Training
Address
Address
2
Wilmington, DE 19803
Professional information
Electrorheological Fluids
US Patent:
4992192, Feb 12, 1991
Filed:
Apr 21, 1989
Appl. No.:
7/341451
Inventors:
Syed M. Ahmed - Wilmington DE
Assignee:
Hercules Incorporated - Wilmington DE
International Classification:
C10M16904, C09K 300
US Classification:
252 73
Abstract:
Disclosed are electrorheological (ER) fluids which display improved stability against sedimentation, reduced current density and good ER responses. Thes=e ER fluids are prepared from monomers which are polymerized by dispersion polymerization in a low conductivity medium which also serves as the dispersion medium for the fluid. The ER fluids are further processed by modifying the polymer particles through polymerization of a hydrophilic monomer to form a hydrophilic shell or globule around the particles followed by neutralization through addition of an organic soluble base. The resulting dispersion is then doped with water to obtain a stable ER fluid. The hydrophilic shell or globule constitutes about 15% of the particle. Water dopant is only absorbed by the hydrophilic portion of the particle and does not enter into the core of the particle. The quantity of water is significantly reduced, which in turn results in a significant reduction of the current density at any given comparative voltage.
Electrorheological Fluids
US Patent:
4990279, Feb 5, 1991
Filed:
Apr 21, 1989
Appl. No.:
7/341450
Inventors:
Syed M. Ahmed - Wilmington DE
Assignee:
Hercules Incorporated - Wilmington DE
International Classification:
C10M16904, C09K 300
US Classification:
252 73
Abstract:
Disclosed are electrorheological (ER) fluids which display improved stability against sedimentation, reduced current density and good electrorheological response. These ER fluids are prepared from monomers which are polymerized by dispersion polymerization in a low conductivity medium which in most embodiments of the invention serves as the dispersion medium for the fluid. the ER fluids are further processed by modifying the polymer particles through polymerization of a hydrophilic monomer to form a hydrophilic shell or globule around the particles. The resulting dispersion is then doped with water to obtain a stable ER fluid. The hydrophilic shell or globule constitutes a minor part of the particle. Water dopant is only absorbed by the hydrophilic portion of the particle and does not enter into the core of the particle. The quantity of water is significantly reduced, which in turn results in a significant reduction of the current density at any given applied field strength.
Water-Soluble Polymer Dispersion
US Patent:
4799962, Jan 24, 1989
Filed:
Dec 24, 1987
Appl. No.:
7/137841
Inventors:
Syed M. Ahmed - Wilmington DE
Assignee:
Aqualon Company - Wilmington DE
International Classification:
C08N 108
US Classification:
106188
Abstract:
A particulate water-soluble polymer is dispersed in a liquid medium comprised of low molecular weight polyethylene glycol, water and high molecular weight polyethylene glycol in amounts sufficient to impart stability to the dispersion. The dispersion is used in a process for dispersing the water-soluble polymer into aqueous solutions, such as latex paints, comprising preparing the dispersion and feeding the dispersion into the aqueous solution. The dispersion has excellent dispersion stability and fluidity, and is easier to handle and has a higher dissolution rate than the dry powder (particulate) form of the water-soluble polymer.
Electrorheological Fluids
US Patent:
5073282, Dec 17, 1991
Filed:
Apr 21, 1989
Appl. No.:
7/341441
Inventors:
Syed M. Ahmed - Wilmington DE
Assignee:
Hercules Incorporated - Wilmington DE
International Classification:
C10M16904, C09K 300
US Classification:
252 77
Abstract:
Disclosed are electrorheological fluids which display improved stability against sedimentation, reduced current density and good electrorheological responses. In the preferred embodiment of this invention, these electrorheological fluids are prepared from monomers which are polymerized by dispersion polymerization in a low conductivity medium which also serves as the dispersion medium for the fluid.