Pacita I Tiemsin

20130273371, Oct 17, 2013

Apr 11, 2012

13/443940

Pacita I. Tiemsin - Newport News VA, US
Donald M. Oglesby - Hertford NC, US
Jacqueline L. Schryer - Poquoson VA, US

U.S.A. as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

C08F 12/08
B32B 5/16
C08F 2/16

428402, 526222

A process for producing highly monodisperse polystyrene particles includes steps of mixing water and styrene in a reactor, optionally adding an electrolyte to the mixture, purging the mixture of oxygen, adding a polymerization initiator while agitating and heating the mixture, and maintaining agitation and heating for a time sufficient to achieve a desired yield of monodisperse polystyrene particles having a particle size from 0.25 microns to 2.5 microns and a statistical quality factor greater than 10.

20180244814, Aug 30, 2018

Apr 27, 2018

15/964735

- Washington DC, US
Pacita I. Tiemsin - Newport News VA, US
Paul M. Danehy - Newport news VA, US
Jason E. Danley - Lincoln NE, US

C08F 12/30
C09D 11/328
C09D 11/50
C09K 11/02

Various embodiments provide dye-doped polystyrene microspheres generated using dispersion polymerization. Polystyrene microspheres may be doped with fluorescent dyes, such as xanthene derivatives including kiton red 620 (KR620), using dispersion polymerization. Certain functionalities, such as sodium styrene sulfonate, may be used to shift the equilibrium distribution of dye molecules to favor incorporation of the dye into the particles. Polyelectrolyte materials, such as poly(diallyldimethyl ammonium chloride), PolyDADMAC, may be used to electrostatically trap and bind dye molecules within the particles. A buffer may be used to stabilize the pH change of the solution during dye-doped polystyrene microsphere generation and the buffer may be selected depending on the pKa of the dye being incorporated. The various embodiments may provide dye-doped polystyrene microspheres, such as KR620-doped polystyrene microspheres that are non-toxic and non-carcinogenic. These non-toxic and non-carcinogenic dye-doped polystyrene microspheres may be suitable for use in wind tunnel testing.

20150322336, Nov 12, 2015

May 7, 2015

14/706585

- Washington DC, US
Pacita I. Tiemsin - Newport News VA, US
Paul M. Danehy - Newport News VA, US
Jason E. Danley - Lincoln NE, US

C09K 11/02
G01M 9/04
G01F 1/704
C09K 11/06

Various embodiments provide dye-doped polystyrene microspheres generated using dispersion polymerization. Polystyrene microspheres may be doped with fluorescent dyes, such as xanthene derivatives including kiton red 620 (KR620), using dispersion polymerization. Certain functionalities, such as sodium styrene sulfonate, may be used to shift the equilibrium distribution of dye molecules to favor incorporation of the dye into the particles. Polyelectrolyte materials, such as poly(diallyldimethyl ammonium chloride), PolyDADMAC, may be used to electrostatically trap and bind dye molecules within the particles. A buffer may be used to stabilize the pH change of the solution during dye-doped polystyrene microsphere generation and the buffer may be selected depending on the pKa of the dye being incorporated. The various embodiments may provide dye-doped polystyrene microspheres, such as KR620-doped polystyrene microspheres that are non-toxic and non-carcinogenic. These non-toxic and non-carcinogenic dye-doped polystyrene microspheres may be suitable for use in wind tunnel testing.