Chased from Sigma-Aldrich. Di-sodium hydrogen phosphateGamero-Quijano et al., Sci. Adv. 7, eabg
Chased from Sigma-Aldrich. Di-sodium hydrogen phosphateGamero-Quijano et al., Sci. Adv. 7, eabg4119 (2021) 5 NovemberSCIENCE ADVANCES | Research ARTICLESnell’s law (TFT sin 1 = H 2O sin two; where TFT = 1.414, H2O = 1.330, and two is assumed to become 90. The light supply (Xe lamp HPX-2000, Ocean Optics) was guided by an optical fiber using a 200-m core (Newport) and focused around the water-TFT interface through plano-convex (Thorlabs) and achromatic lenses (Newport); see Fig. 6. All lenses had been placed at their confocal lengths. The longer wavelengths ( 700 nm) have been reduce by a Hot Mirror (Thorlabs) to avoid heating on the interfacial region. The reflected light was focused onto an optical fiber using a 1500 mm core (Thorlabs). The absorption spectra were recorded by a Maya 2000Pro (Ocean Optics). In situ parallel beam UV/Vis absorbance spectroscopy The spectrometer utilised was a USB 2000 Fiber Optic Spectrometer (Ocean Optics). The light supply that was a DH-2000-BAL deuteriumhalogen (Ocean Optics) was guided through the optical fiber of 600 m in diameter (Ocean Optics, USA). The light beam was collimated utilizing optical lenses (Thorlabs; focal length, 2 cm) just before and soon after the transmission on the beam by means of the electrochemical cell. The light beam passed by means of the electrochemical cell slightly above the water-TFT interface, i.e., via the aqueous phase. w The interfacial Galvani potential difference ( o ) was controlled applying an Autolab PGSTAT204 potentiostat (PI3K Activator custom synthesis Metrohm, Switzerland). Differential capacitance measurements AC voltammetry was performed inside a four-electrode electrochemical cell. Differential capacitance was calculated from the interfacial admittance recorded employing an Autolab FRA32M module in mixture with all the Autolab PGSTAT204 at a frequency of 5 Hz and root imply square amplitude of five mV. The scan direction was from adverse toward additional optimistic potentials, from ca. -0.three to +0.55 V. Double prospective step chronoamperometry DPSCA experiments had been performed within a four-electrode electrochemical cell in conjunction with the in situ parallel beam UV/vis absorbance spectroscopy setup described vide supra. The initial pow tential step was held at o = +0.four V for 10 s. The second potential w step was damaging and held at o = -0.3 V for 10 s. This double possible step was repeated 300 times, and a mGluR2 Activator Storage & Stability single UV/vis spectrum was recorded within every cycle. Confocal fluorescence microscopy Samples have been imaged on an ImageXpress Micro Confocal High-Content Imaging Program (Molecular Devices) with 20X S Strategy Apo-objective. Confocal Raman spectroscopy Raman spectra had been collected applying a Renishaw Invia Qontor confocal Raman spectrometer (excitation = 532 nm) in static mode (2400 grooves/mm). As a result of vibrations from the liquid-liquid interface, and to keep a good focus during the whole scan, the static mode was preferred to acquire Raman spectra more than the synchroscan mode. Static mode allowed faster scan over the 650 to 1800 cm-1 area of interest. In average, 10 to 15 s was required to record a complete Raman spectrum.Fig. 6. UV/vis-TIR experimental setup. (Best) Image in the visible light beam undergoing total internal reflection at a water-TFT interface. Photo credit: Alonso Gamero-Quijano (University of Limerick, Ireland). (Bottom) Optical setup for in situ UV/vis absorbance measurements in total internal reflection (UV/vis-TIR). (1) Xe light source (Ocean optics HPX-2000), (two) neutral density (ND) filter, (three) Ultraviolet fused silica (UVFS) oated pl.