Navigation Links
Using pressure to swell pores, not crush them
Date:7/16/2013

More than a decade ago, Thomas Vogt and Yongjae Lee, then colleagues at Brookhaven National Laboratory, uncovered a counter-intuitive property of zeolites. When they put these porous minerals in water, and then put the water under high pressure, the tiny cavities within the zeolites actually grew in size.

Pressure failed to crush, and even caused expansion. In the years since, Vogt and Lee, now at the University of South Carolina and Yonsei University (Seoul), respectively, have followed up with cation exchange experiments, placing a series of alkali metal ions into the pores of the aluminosilicate zeolites, particularly focusing on natrolite. X-ray diffraction studies, in collaboration with Chi-Chang Kao at Stanford University, have revealed the interior geometry of the cavities and the arrangement of the cations and water molecules held within, before and after pressurization.

The team has just published a detailed characterization of Li+, Na+, K+, Rb+ and Cs+ natrolites, the first four of which, when treated under pressure in water, become "super-hydrated" with water molecules that is, the process inserts more water molecules into the zeolites than are present under ambient conditions.

The water molecules and ions together adjust the surrounding aluminosilicate framework. The team likens the shift in structure under pressure to what you see when you shift a "chatterbox," the children's fortune teller constructed from paper. The pressure-induced hydration can cause dramatic unit cell volume increases: more than a 20 percent expansion in Li-natrolite, for example.

The phenomenon is more than just an academic curiosity. The team is pursuing a number of applications in which a "tuned" cavity size that is triggered by pressure could be useful. Selectively and irreversibly trapping radioactive cations in a nuclear waste stream, for example, is just one area in which they've already demonstrated progress.


'/>"/>

Contact: Steven Powell
spowell2@mailbox.sc.edu
803-777-1923
University of South Carolina
Source:Eurekalert

Page: 1

Related biology technology :

1. Official Opening of UKs Biggest Bioethanol Plant Using Praj Technology
2. New Approaches in Immunogenicity Assessment Using the New SQiDlite™ System: Case Study Analysis, New Life Science Webinar Hosted by Xtalks
3. Live Xtalks Webinar Highlights Vaccine and Biotherapeutic Formulation Development and Manufacture Using Spray-Drying
4. Natural Acne Remedy, Probiotic Action Explains the Science behind Using Probiotics for Better Health
5. RegeneCure Starts Clinical Study Using Polymeric Bone Stimulating Membrane for Dental Implants
6. What Causes Acne? Adult Acne Treatment, Probiotic Action, Shares Insight on New Culprits Causing Breakouts
7. Rapid Identification and Strain Typing of Salmonella in Food Using Genome Sequence Scanning Technology
8. Steps for Getting Rid of Bed Bugs without Using Chemicals and Avoiding Them While Traveling Enumerated by My Cleaning Products in Its Latest Post
9. The Majority of Physicians that Treat Hepatitis C Virus (HCV) Have Begun "Warehousing" and Preparing Their HCV Patients for the Next Generation of HCV Treatments
10. Acne Cream, Probiotic Action Shares News on How Some Food may Breed Acne Causing Bacteria
11. Bed Bugs Cost Alton Housing Authority $35,000; New Help, How to Kill Bed Bugs With Less Expense, Introduced by My Cleaning Products
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/22/2017)... ... March 22, 2017 , ... Researchers ... from small lab samples to full-size tissues, bones, even whole organs to implant ... system that delivers blood deep into the developing tissue. , Current bioengineering ...
(Date:3/22/2017)... Good Start Genetics, a leading family genomics ... million covered lives mark through its most recent payor ... . With newly signed contracts nationally and others ... payor acceptance based on the quality of its science, ... its industry-leading customer care and support and its published ...
(Date:3/22/2017)... March 22, 2017 The global ... a research report by Transparency Market Research (TMR). The ... Inc., and AbbVie Inc., accounted for a share of ... players in this market are focusing aggressively on mergers, ... which is likely to lead to market consolidation in ...
(Date:3/22/2017)... CAMBRIDGE, Mass. , March 22, 2017   ... of next-generation cancer therapeutics designed to target cancer stemness ... Patricia S. Andrews as Chief Executive Officer, ... will succeed Chiang J. Li , M.D., FACP, ... company ten years ago. Under his leadership, Boston Biomedical ...
Breaking Biology Technology:
(Date:2/22/2017)... Feb. 22, 2017 With the biometrics ... Research identifies four technologies that innovative and agile ... significant share in the changing competitive landscape: multifactor ... authentication.   "Companies can no longer ... security," says Dimitrios Pavlakis , Industry Analyst ...
(Date:2/14/2017)... WINSTON-SALEM, N.C. , Feb. 14, 2017  Wake ... FRY-shlog), M.D., as its new chief executive officer (CEO). ... succeeds CEO John D. McConnell , M.D., who ... new position at the Medical Center, after leading it ... oversee the full scope of Wake Forest Baptist,s academic ...
(Date:2/9/2017)... The biomass boiler market report by Transparency ... market globally in terms of revenue (US$ Mn) based ... for biomass boilers has been segmented on the basis ... The market based on feedstock type, has been segmented ... energy crops, urban residues, and others. On the basis ...
Breaking Biology News(10 mins):