Scientific American
JULY 2002
Filtering in Reverse – Membranes That Pass the Big Stuff Through
By: Steven Ashley
2002 Cooperative Research Award in Polymer Science and Engineering
Sponsored by the Eastman Kokak Company
Professor Benny Freeman of the Chemical Engineering Department at University of Texas at Austin and Dr. Ingo Pinnau of Membrane Technology and Research (MTR) are winners of the 2002 Award for Cooperative Research in Polymer Science and Engineering presented by the American Chemical Society’s (ACS) Division of Polymeric Materials: Science and Engineering (PMSE). Dr. Brian Benecewicz, Chairman of the PMSE Cooperative Research Award Committee, announced the award, which has been presented annually since 1992, when it was endowed by a gift from the Eastman Kodak Company to PMSE. [Read more…] about 2002 Cooperative Research Award in Polymer Science and Engineering
C&EN: Science & Technology: Waterworks
SCIENCE & TECHNOLOGY
April 9, 2001
Volume 79, Number15
CENEAR 79 15 pp.32-38
ISSN 0010-2347
WATERWORKS
Research accelerates on advanced water-treatment technologies as their use in purification grows
MAIRIN B. BRENNAN, C&EN WASHINGTONConventional water purification is a tried-and-true process that hasn’t changed much in decades: Coagulation and flocculation, sedimentation, sand or gravel filtration, and chlorine disinfection are the customary steps. Wresting fresh water from seawater is also a long-standing technique, especially in oil-rich, water-starved countries where the cost of the energy-intensive process is not an issue. [Read more…] about C&EN: Science & Technology: Waterworks
CNN Sci-Tech: New plastics may keep soft drinks from falling flat
February 6, 1997
From Correspondent David George
RALEIGH, North Carolina (CNN) — Ever wonder why soft drinks sometimes go flat even before you’ve opened the bottle? Ever wonder when somebody’s going to do something about it?
Wonder no more. Researchers at North Carolina State University (NCSU) are experimenting with liquid crystal polymers they say could be used to make plastic soda bottles and other plastic packaging virtually impervious to gas leakage, thus greatly increasing the “shelf life” of hundreds of products.
Leakage is a universal problem in plastic packaging. Every plastic soda bottle that rolls off a production line, every food product packed in plastic, and every plastic container of any kind on any store shelf anywhere will leak to some degree. [Read more…] about CNN Sci-Tech: New plastics may keep soft drinks from falling flat
Pulse Planet: Barrier Plastics
ambience: soda pouring, fizzing
Anyone who’s ever opened a bottle of soda knows that sound. But why is it that even unopened plastic soda bottles lose their fizz over time? I’m Jim Metzner, and this is the Pulse of the Planet.
“The carbon dioxide that gives soda what people normally associate with as fizz is soluble and will dissolve into the wall of the plastic and be transported through the plastic and escape. In much the same way that air in your tires will eventually escape and the tire pressure goes down with time.”
Benny Freeman is an Associate Professor of chemical engineering at North Carolina State University. He’s been studying the effectiveness of plastic packaging. [Read more…] about Pulse Planet: Barrier Plastics
To really hold that fizz
SCIENCE NEWS ONLINE
Food for Thought
August 24, 1996
If it sits on the shelf long enough, even an unopened 2-liter bottle of Coca-Cola or Diet Sprite will lose its zesty effervescence. What happens is the pent up carbon dioxide slowly leaks through microscopic holes in the molecular structure of the container’s plastic. Fortunately, not all plastics are as permeable as the inexpensive polyethylene terephthalate (PET) used to make large soft-drink bottles. One novel class of more rigid polyesters appears to offer particular promise for bottled drinks. It develops extraordinary barrier properties after it’s been transformed into a liquid crystal, for example, by heating.
Benny D. Freeman of North Carolina State University began working with these experimental materials 5 years ago under a grant issued jointly by the National Science Foundation and Electric Power Research Institute (EPRI). Initially, his mission was one of basic research: to understand how heat alters the structure and barrier properties of these polyesters. [Read more…] about To really hold that fizz
