Molecular Aggregation and Photoisomerization of Langmuir-Blodgett Films of Azobenzene-Containing Long-Chain Fatty Acids and Their Salts Studied by Ultraviolet-Visible and Infrared Spectroscopies

Gold-Colored Organic Crystals Formed from an Azobenzene Derivative

“…They reported that crystals of p-conjugated compounds with a thiophene-pyrrole-thiophene chemical skeleton produce a gold color 5) . The aggregation of azobenzene derivatives has been extensively studied, and they have been found to form layers of J-aggregates or H-aggregates on solid substrates 6,7) . However, most of these studies were limited to the photoisomerization of several layers consisting of J-or H-aggregates; there are no reports on the color of crystals formed by stacking of a number of monolayers formed from the Jaggregates of an azobenzene derivative.…”

Cleaning ceramic membranes used in treating desizing wastewater with a complex-surfactant SDBS-assisted method

“…It can be seen from Fig. 16(a) and (b) that the stretching vibrations of aliphatic C-H (at 2926 and 2856 cm − 1 ), and aliphatic C-H deformations (at 1465 cm − 1 ) [34,35,60] were observed. In particular, the band of the sulfonic acid group at 1190 cm − 1 [60] was also detected in Fig.…”

“…5(a)-(d) were the IR spectra of refining agent, dispersant, wastewater and foulants on the membrane surface, respectively. Resonance at 2850 and 2920 cm −1 was assigned to the symmetry flex vibration of C-H bond in -CH 3 and -CH 2− , originating from catenary carbon-containing materials [34,35] such as refining agent, dispersant and PMA. The peak at 1732 cm −1 was assigned to the stretching vibration of C_O in ester carboxyl groups or carboxyl carbonyl [36].…”

In-Situ Optical Monitoring of Electrochemical Copper Deposition Process for Semiconductor Interconnection Technology

“…UV/VIS/NIR optical absorption, transmission, and reflectance (ATR) spectroscopy are useful methods for chemical analysis of molecular aggregation, orientation, and structure [12,13]. Optical emission spectroscopy (OES) has been actively employed as an in-situ monitoring tool for plasma diagnostics and process monitoring for more than a decade [14,15].…”