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:6/23/2016)... ... June 23, 2016 , ... Supplyframe, the ... the Supplyframe Design Lab . Located in Pasadena, Calif., the Design Lab’s ... how hardware projects are designed, built and brought to market. , The Design ...
(Date:6/23/2016)... ... , ... In a new case report published today in STEM CELLS Translational ... lymphedema after being treated for breast cancer benefitted from an injection of stem cells ... this debilitating, frequent side effect of cancer treatment. , Lymphedema refers to ...
(Date:6/23/2016)... 23, 2016  Blueprint Bio, a company dedicated to ... medical community, has closed its Series A funding round, ... "We have received a commitment from Forentis ... need to meet our current goals," stated Matthew ... runway to complete validation on the current projects in ...
(Date:6/23/2016)... 23, 2016 On Wednesday, June 22, ... down 0.22%; the Dow Jones Industrial Average edged 0.27% lower ... 2,085.45, down 0.17%. Stock-Callers.com has initiated coverage on the following ... Therapeutics (NASDAQ: NKTR ), Aralez Pharmaceuticals Inc. (NASDAQ: ... BIND ). Learn more about these stocks by accessing ...
Breaking Biology Technology:
(Date:5/12/2016)... DALLAS , May 12, 2016 ... has just published the overview results from the Q1 ... of the recent wave was consumers, receptivity to a ... wearables data with a health insurance company. ... choose to share," says Michael LaColla , CEO ...
(Date:5/3/2016)... 2016  Neurotechnology, a provider of high-precision biometric ... Biometric Identification System (ABIS) , a complete system ... ABIS can process multiple complex biometric transactions with ... fingerprint, face or iris biometrics. It leverages the ... MegaMatcher Accelerator , which have been used ...
(Date:4/28/2016)... First quarter 2016:   , ... the first quarter of 2015 The gross margin was ... 18.8) and the operating margin was 40% (-13) Earnings ... flow from operations was SEK 249.9 M (21.2) , ... SEK 7,000-8,500 M. The operating margin for 2016 is ...
Breaking Biology News(10 mins):