Second-Harmonic Scattering in Layered Double Hydroxide Colloids: A Microscopic View of Adsorption and Intercalation

Abstract

The interaction of methyl orange dye with a layered double hydroxide colloidal material is investigated using real-time polarization-resolved second-harmonic scattering (SHS). Interlayer charge compensating anion exchange is studied from initial carbonate or nitrate anions to methyl orange negatively charged dye. A theoretical model, taking into account the field retardation effect, is presented to simulate the polarization-resolved SHS experiments. Various geometrical dye configurations inside or around the host material have been modeled. A comparison with the experimental data permits to give a microscopic description of the dye organization and its time evolution during the intercalation process in the material.

PySHS: Python Open Source Software for Second Harmonic Scattering

“…Nonlinear light scattering methods and in particular second harmonic scattering (SHS) has been widely used to investigate solvation, hydration, and correlation − of molecule in solution, self-assembly, , interfacial properties of small particles, − droplets in liquids, , biological membranes, − or structuration of materials. − Numerous models − have been developed to interpret experimental data and in particular angular distribution and polarization dependence of the second harmonic scattered light. The understanding of such variation allows the recovery of important properties about the symmetry, organization, and/or correlation − of the nano-objects probed.…”

Second-Harmonic Scattering Can Probe Hydration and Specific Ion Effects in Clay Particles

“…Experimental Optics Setup. Figure 1 depicts the experimental setup 22 and the notations adopted in this article. Briefly, this setup was built on a femtosecond Ti-sapphire oscillator laser source providing pulses with a duration of about 100 fs at a repetition rate of 80 MHz (coherent, model Chameleon ultra II).…”

PySHS : A Python Open Source Software For Second Harmonic Scattering

“…Two ways are implemented to perform the ISHS(𝛾, Π, Θ) calculation: the first way implemented in the SHS program of PySHS package explicitly computes ISHS according to equations (3)(4)(5)(6)(7)(8)(9). The second way implemented in the SHSlinear program, uses the approach detailed in these references 6,23,31 and in the HRS_Computing software 34 , approximates the exponential term in equation ( 5) by:…”

“…Nonlinear light scattering methods and in particular Second Harmonic Scattering (SHS) has been widely used to investigate solvation 1 , hydration 2 and correlation [3][4][5][6][7] of molecule in solution 8 , self assembly [9][10] , interfacial properties of small particles [11][12][13][14] , droplets in liquids [15][16] , biological membranes [17][18][19][20][21] or structuration of materials [22][23][24] . Numerous models [25][26][27][28][29][30] have been developed to interpret experimental data and in particular angular distribution and polarization dependence of the second harmonic scattered light.…”