Paul Dillon, Ph.D.
Rolande Hodel, Ph.D.
Peter Corfield, Ph.D.
Jody Reifenberg, M.D.
Jason Poland, M.S.
Sr. Mary-Virginia Orna, Ph.D
Interested in becoming a member of the ACS?
American Chemical Society
New York Section, Inc.
Department of Chemistry
St. John's University
8000 Utopia Parkway
Jamaica, NY 11439
Special Seminars - Free and Open to the Public
Westchester Community College
75 Grasslands Road, Valhalla, NY 10595
Gateway Building Room 110
For more information, contact Paul Dillon:
|February 12||Microengineered Biomaterials and Biosystems for Cancer and Immunoengineering|
Weiqing Chen, Departments of Biomedical Engineering and Mechanical and Aerospace Eingineering
New York University
|March 18||Science Cafe|
CANCELLED - Safety, Fire, and Chemical Hazards in Special Effects
Monona Rossol, M.S., M.F.A., Arts, Crafts & Theater Safety, Inc.
People in theater, film and television work with chemicals every day. As a child, Monona worked in variety entertainment (Vaudeville), and saw chemicals used in magic acts that caused things to flash into flame, disappear, or change color. Today she deals with chemicals ranging from those used to paint faces (makeup) or to paint scenery to explosive chemicals used to blow up cars in movies. The program will start with a short video showing how pyrotechnic chemicals are used to simulate bullets hitting walls or people and then shell discuss a host of other chemical safety issues in the entertainment industry.
|April 23||CANCELLED - Westchester Distinguished Scientist Award Dinner and Student Achievement Awards|
Trisiloxane Alkoxylates as Adjuvants for Agriculture
George A. Policello, Momentive Performance Materials
Trisiloxane-based surfactants have been used for over 35 years as spray adjuvants for agricultural applications. Relative to conventional adjuvants, trisiloxane surfactants provide an extremely low aqueous surface tension (~21 mN/m at 0.1%). This surface activity, coupled with a compact hydrophobe (trisiloxane portion of the molecule), makes these unique surfactants Super-spreaders, where the spray droplet is transformed into a thin film on the leaf surface. Therefore, trisiloxane solutions easily wet almost any waxy leaf surface, and the overall coverage on a target plant is significantly increased. This results in spray volume reductions of up to 90%, benefiting areas where water is in short supply. Additionally, a reduction in water usage allows the grower to treat more acres per tank-load, thereby saving time, labor and energy.
Another extraordinary property of trisiloxane surfactants is their ability to promote rapid uptake of spray solutions via stomatal flooding in as little as 20 seconds. Active ingredients taken up into the plant via this pathway become immediately rainfast (resistant to wash-off), thereby reducing waste, and in some cases allowing for a reduction in pesticide usage.
Silwet L-77 adjuvant was the first trisiloxane-based surfactant developed for agricultural applications. This unique class of Super-spreading wetting agents was introduced into agriculture in 1985, in response to the inability of many herbicides to control gorse (Ulex europaeus), a noxious invasive weed in New Zealand. Union Carbide, in collaboration with the Forest Research Institute in NZ, quickly realized that Silwet L-77 adjuvant significantly enhanced the performance of herbicides that were previously incapable of controlling gorse. In fact, only Silwet L-77 adjuvant had the ability to effectively wet the waxy surface of gorse, thereby enabling a 70% reduction in pesticide requirements, while delivering effective control.
This presentation will detail the historical development of Super-spreading trisiloxane-based wetting agents, including examples illustrating how commercial growers use such surfactants as a regular part of their spray program, including their use in organic farming.
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