Surface chemistry of mesoporous materials : effect of nanopore confinement.

Journal Article · Fri Feb 28 23:00:00 EST 2003 · Proposed for publication in the 2003 Materials Research Society Proceeding.

OSTI ID:917475

Wang, Yifeng ^[1]; Bryan, Charles R ^[2]; Xu, Huifang ^[3]; Gao, Huizhen ^[4]

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1. Sandia National Laboratories, Carlsbad, NM
2. Sandia National Laboratories, Carlsbad, NM
3. University of New Mexico, Albuquerque, NM
4. Sandia National Laboratories, Carlsbad, NM

Acid-base titration and metal sorption experiments were performed on both mesoporous alumina and alumina particles under various ionic strengths. It has been demonstrated that surface chemistry and ion sorption within nanopores can be significantly modified by a nano-scale space confinement. As the pore size is reduced to a few nanometers, the difference between surface acidity constants (pK2 - pK1) decreases, giving rise to a higher surface charge density on a nanopore surface than that on an unconfined solid-solution interface. The change in surface acidity constants results in a shift of ion sorption edges and enhances ion sorption on that nanopore surfaces.

• Research Organization: Sandia National Laboratories
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 917475
• Report Number(s): SAND2003-0905J
• Journal Information: Proposed for publication in the 2003 Materials Research Society Proceeding., Journal Name: Proposed for publication in the 2003 Materials Research Society Proceeding.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ALUMINIUM OXIDES
CHARGE DENSITY
NANOSTRUCTURES
PH VALUE
PORE STRUCTURE
POROUS MATERIALS
SORPTIVE PROPERTIES