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Conjugate Acid-Base Interaction Driven Phase Transition at a 2D Air-Water Interface.
Rajagopal, R; Hong, M K; Ziegler, L D; Erramilli, S; Narayan, Onuttom.
Afiliação
  • Rajagopal R; Department of Physics, Boston University, Boston, Massachusetts 02215, United States.
  • Hong MK; Department of Physics, Boston University, Boston, Massachusetts 02215, United States.
  • Ziegler LD; Department of Chemistry and The Photonics Center, Boston University, Boston, Massachusetts 02215, United States.
  • Erramilli S; Department of Physics, Boston University, Boston, Massachusetts 02215, United States.
  • Narayan O; Physics Department, University of California, Santa Cruz, California 95064, United States.
J Phys Chem B ; 125(23): 6330-6337, 2021 06 17.
Article em En | MEDLINE | ID: mdl-34076448
A lattice model is described to explain a recent striking Sum Frequency Generation (SFG) observation of a cooperative surface adsorption effect for an organic acid system at an air-water interface. The reported anomalous pH-dependent enhancement in p-methylbenzoic acid (pmBA) arises from an interaction between the acid (HA) and its conjugate base anion (A-), which competes with strong Coulombic repulsion between the conjugate bases (A--A -). Using a statistical mechanical approach, this lattice gas model reveals an analogy to well-studied magnetic systems in which the attraction between the two different molecular species leads to a phase transition to a two-dimensional checkerboard phase consisting of a network of anion-acid complexes formed at the low-dielectric air-water interface. Cooperative acid-anion interactions that control partitioning at solution and aerosol interfaces are of interest to fields ranging from oceanic and atmospheric chemistry, pharmacology, and chemical engineering.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água / Ar Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água / Ar Idioma: En Ano de publicação: 2021 Tipo de documento: Article