Literature DB >> 18491896

Structures and charging of alpha-alumina (0001)/water interfaces studied by sum-frequency vibrational spectroscopy.

Luning Zhang1, Chuanshan Tian, Glenn A Waychunas, Y Ron Shen.   

Abstract

Sum-frequency vibrational spectroscopy in the OH stretch region was employed to study structures of water/alpha-Al2O3 (0001) interfaces at different pH values. Observed spectra indicate that protonation and deprotonation of the alumina surface dominate at low and high pH, respectively, with the interface positively and negatively charged accordingly. The point of zero charge (pzc) appears at pH approximately = 6.3, which is close to the values obtained from streaming potential and second-harmonic generation studies. It is significantly lower than the pzc of alumina powder. The result can be understood from the pK values of protonation and deprotonation at the water/alpha-Al2O3 (0001) interface. The pzc of amorphous alumina was found to be similar to that of powder alumina.

Entities:  

Year:  2008        PMID： 18491896     DOI： 10.1021/ja8011116

Source DB:  PubMed          Journal:  J Am Chem Soc        ISSN： 0002-7863            Impact factor:   15.419


  9 in total

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6.  Structural evolution of water and hydroxyl groups during thermal, mechanical and chemical treatment of high purity natural quartz.

Authors:  Bartłomiej A Gaweł; Anna Ulvensøen; Katarzyna Łukaszuk; Bjørnar Arstad; Astrid Marie F Muggerud; Andreas Erbe
Journal:  RSC Adv       Date:  2020-08-05       Impact factor: 4.036

7.  Water orientation and hydrogen-bond structure at the fluorite/water interface.

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Journal:  Sci Rep       Date:  2016-04-12       Impact factor: 4.379

8.  Spontaneous Formation of Cushioned Model Membranes Promoted by an Intrinsically Disordered Protein.

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Journal:  Langmuir       Date:  2020-04-07       Impact factor: 3.882

9.  Ice Nucleation at the Water-Sapphire Interface: Transient Sum-Frequency Response without Evidence for Transient Ice Phase.

Authors:  Ahmed Abdelmonem; Ellen H G Backus; Mischa Bonn
Journal:  J Phys Chem C Nanomater Interfaces       Date:  2018-10-10       Impact factor: 4.126
  9 in total

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