Variable temperature studies on mesogenic polythiophenes using 2D-IR and WAXS

Chandrasekaran, Suryanarayanan; Prasannan, Adhimoorthy; Hong, Po‐Da; Sambathkumar, B.; Somanathan, N.

doi:10.1016/j.matchemphys.2013.11.046

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…Such large surface area per repeat unit for derivatives of poly(ethylene oxide) have been studied. 28 Our earlier studies 25 on the hetero correlation analysis of variable temperature XRD and variable temperature IR studies of the above polymers show that the packing is inuenced by the alkoxy chain length and planarization takes place in the organisation. The compression modulus C s À1 is a parameter used to dene the different states of the monolayer and the collapse pressure and is obtained from the equation.…”

Section: Resultsmentioning

confidence: 92%

“…The detailed synthetic procedure of the monomers and polymers was presented in our earlier publication 24,25 and the details of PTC6 and PTC14 and polymerization and structural conrmation using NMR, ESI-MS and Elemental analysis is given in ESI. † (M n ¼ 7475, M w ¼ 20 780 and PDI ¼ 2.78); 24 regioregularity of PTC6 -57.89%; PTC14 -61.11% calculated from proton NMR.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Studies on the Langmuir–Blodgett films of polythiophene containing a mesogenic side chain

et al. 2014

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Section: Resultsmentioning

confidence: 92%

Section: Experimental Methodsmentioning

confidence: 99%

Studies on the Langmuir–Blodgett films of polythiophene containing a mesogenic side chain

et al. 2014

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“…The weak and broad absorption band observed at approximately 3449 cm −1 in the spectrum of F 0 corresponds to chemisorbed water [17]. The region (a) involving weak and broad absorptions of 2875, 2934, 2960, and 3071 cm −1 correspond to the C–H stretching mode of CH 2 /CH 3 groups [18,19,20]. The region (b) with peaks in the range 1675–1707 cm −1 are assignable to the C=O stretching mode [21].…”

Section: Resultsmentioning

confidence: 99%

Photo-Induced Super-hydrophilic Thin Films on Quartz Glass by UV Irradiation of Precursor Films Involving a Ti(IV) Complex at Room Temperature

Tanabe

Nagai

et al. 2019

Materials

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Photo-induced super-hydrophilic thin films were fabricated on a quartz glass substrate by ultraviolet (UV) irradiation of a molecular precursor film at room temperature. A molecular precursor film exhibiting high solubility to both ethanol and water was obtained by spin-coating a solution involving a Ti(IV) complex; this complex was prepared by the reaction of Ti(IV) alkoxide with butylammonium hydrogen oxalate and hydrogen peroxide in ethanol. Transparent and well-adhered amorphous thin films of 160–170 nm thickness were obtained by weak UV irradiation (4 mW·cm−2 at 254 nm) of the precursor films for over 4 h at room temperature. The resultant thin films exhibiting low refractive indices of 1.78–1.79 were mechanically robust and water-insoluble. The chemical components of the thin films were examined by means of Fourier transform-infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) spectra, focusing on the presence of the original ligands. The super-hydrophilic properties (evaluated based on the water contact angles on the surfaces) of the thin films after being kept in a dark condition overnight emerged when the aforementioned UV-light irradiation was performed for 10 min. It was additionally clarified that the super-hydrophilicity can be photo-induced repeatedly by UV irradiation for 10 min (indicated by a contact angle smaller than 4°) even after the hydrophilic level of the thin films had once been lowered by being in a dark condition for 4 h.

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“…The spectrum obtained at pH 9.5 shows characteristic absorption bands of -C=N (stretching vibration) at 1267 cm −1 appearing both on chalcopyrite and galena surfaces [21]. The asymmetrical bending vibration of -CH 3 and scissor rocking vibration of -CH 2 appear on chalcopyrite at 2850 and 2920 cm −1 [22], and on galena at 2854 and 2925 cm −1 [23]. Comparing with the two peaks of IPETC at 2877 and 2978 cm −1 [24], redshift occurs significantly on both minerals.…”

Section: Ftir Studymentioning

confidence: 95%

Fundamental Flotation Behaviors of Chalcopyrite and Galena Using O-Isopropyl-N-Ethyl Thionocarbamate as a Collector

Sun

et al. 2018

Minerals

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Copper and lead are two important and widely used metals in industry. Chalcopyrite (CuFeS 2 ) is associated with galena (PbS) in ore, and it has been a research hotspot in separating galena from chalcopyrite by flotation. In this study, the flotation behaviors of chalcopyrite and galena were studied through flotation tests, adsorption measurements, solution chemistry calculation, Fourier transform infrared spectroscopy (FTIR) and molecular dynamics (MD) simulations. The results show that the floatability of chalcopyrite is better than that of galena in the presence of O-isopropyl-N-ethyl thionocarbamate (IPETC), and the recovery difference between chalcopyrite and galena is about 20% when IPETC is 7 × 10 −4 mol/L at pH 9.5, while the floatability difference between the two minerals is significant. Competitive adsorption of OH − and IPETC on mineral surfaces leads to lower floatability of galena than that of chalcopyrite. IPETC is able to remove the hydration layer on mineral surfaces and then adsorb on active sites. The floatability of minerals is enhanced with the increase of their hydrophobicity. This study provides a reference to separate galena from chalcopyrite.

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Variable temperature studies on mesogenic polythiophenes using 2D-IR and WAXS

Cited by 5 publications

References 31 publications

Studies on the Langmuir–Blodgett films of polythiophene containing a mesogenic side chain

Studies on the Langmuir–Blodgett films of polythiophene containing a mesogenic side chain

Photo-Induced Super-hydrophilic Thin Films on Quartz Glass by UV Irradiation of Precursor Films Involving a Ti(IV) Complex at Room Temperature

Fundamental Flotation Behaviors of Chalcopyrite and Galena Using O-Isopropyl-N-Ethyl Thionocarbamate as a Collector

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