Editorial

Kiefer, W.

doi:10.1002/jrs.1798

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…[ 31 ] Strong modes confi rming the imidazolium group, ν(C1 N), are observed at 1154 and 1173 cm −1 for the functionalized ND. [ 36 ] The decyl chains are confi rmed by two prominent, sharp peaks corresponding to the asymmetric and symmetric methylene carbon stretching modes, ν(CH 2 ) as and ν(CH 2 ) sy located at 2931 and 2856 cm −1 , respectively. The position of these modes indicates that upon surface binding the alkyl chains have a considerable amount of gauche defects compared to the unbound monomer (2919 cm −1 at 2849 cm −1 ) which are predominately in an all-trans conformational state.…”

Section: Resultsmentioning

confidence: 98%

Self‐Assembly Directed Organization of Nanodiamond During Ionic Liquid Crystalline Polymer Formation

Ringstrand

Seifert

Podlesak

et al. 2016

Macromol. Rapid Commun.

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The UV-initiated free radical polymerization of a lyotropic mesophase prepared by co-assembly of an aqueous mixture of an ionic liquid (IL) monomer, 3-decyl-1-vinylimidazolium chloride, in a dimethyl sulfoxide dispersion of an IL-monomer nanodiamond conjugate yields a well-ordered 2D hexagonally structured network-polymer composite. The IL monomer is covalently bound to carboxylated detonation diamond via ester-linked 3-decyl-1-vinylimidazolium bromide. Successful preparation of the amphiphile-functionalized nanodiamond is determined by ATR/FT-IR, thermogravimetric analysis, and small-angle X-ray scattering (SAXS). Mesophase and composite structure are evaluated by SAXS, revealing a columnar architecture composed of amphiphilic ionic liquid cylinders containing solvent-rich cores. Self-assembly directed site localization of the nanodiamond positions the particles in the alkyl chain continuum upon polymerization. The composite reversibly swells in ethanol allowing structural variation and modulation of the nanoparticle internal packing arrangement. This work demonstrates that through careful molecular design, self-organization and site-directed assembly of nanodiamond into chemically distinct regions of a nanostructured organogel can be achieved.

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Section: Resultsmentioning

confidence: 98%

Self‐Assembly Directed Organization of Nanodiamond During Ionic Liquid Crystalline Polymer Formation

Ringstrand

Seifert

Podlesak

et al. 2016

Macromol. Rapid Commun.

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“…Both Raman and IR spectra are in good agreement with those previously reported in the literature. [27][28][29][31][32][33][34][35]54,55] They exhibit two well-defined spectral regions: the region of C-H stretching modes (2700-3300 cm À1 ) and the region of the other internal modes, situated below 1650 cm À1 . The 2700-3300 cm À1 spectral region is associated with C-H stretching (anharmonic) modes.…”

Section: Experimental Spectra Of Agtfsi In [Emi][tfsi]mentioning

confidence: 99%

Solvation of AgTFSI in 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid investigated by vibrational spectroscopy and DFT calculations

Liu

Danten

Grondin

et al. 2015

J Raman Spectroscopy

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In this paper we investigate the solvation of silver bis(trifluoromethylsulfonyl)imide salt (AgTFSI) in 1‐ethyl‐3‐methylimidazolium TFSI [EMI][TFSI] ionic liquid by combining Raman and infrared (IR) spectroscopies with density functional theory (DFT) calculations. The IR and Raman spectra were measured in the 200–4000 cm−1 spectral region for AgTFSI/[EMI][TFSI] solutions with different concentrations ([AgTFSI] <0.2 mole fraction). The analysis of the spectra shows that the spectral features observed by dissolution of AgTFSI in [EMI][TFSI] solution originate from interactions between the Ag+ cation and the first neighboring TFSI anions to form relatively stable Ag complexes. The ‘gas phase’ interaction energy of a type [Ag(TFSI)3]2− complex was evaluated by DFT calculations and compared with other interionic interaction energy contributions. The predicted spectral signatures because of the [Ag(TFSI)3]2− complex were assessed in order to interpret the main IR and Raman spectral features observed. The formation of such complexes leads to the appearance of new interaction‐induced bands situated at 753 cm−1 in Raman and at 1015 and 1371 cm−1 in IR, respectively. These specific spectral signatures are associated with the ‘breathing’ mode and the S–N–S and S–O stretching modes of the TFSI anions engaged in the complex. Finally, all these findings are discussed in terms of interaction mechanisms enabling the electrodeposition characteristics of silver from AgTFSI/[EMI][TFSI] IL‐based electrolytic solutions. Copyright © 2015 John Wiley & Sons, Ltd.

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“…All samples under study were spin-coated and treated before measurement as described in the BDS part. During measurements the samples were kept on a sealed THMS350V stage (Linkam Scientific Instruments, UK) using dry liquid nitrogen as a temperature control agent covering a range between 150 and 400 K. The analysed vibrational bands (see Table 2) were assigned on the basis of results from J. Kiefer and coworkers, 43 K. Noack and coworkers, 44 J. C. Yang and coworkers 45 as well as quantum chemistry calculations using the ORCA program system, version 3.0 46,47 implementing the B3LYP functional (as implemented in the Gaussian code B3LYP/G) and 6-31G(2d,2p) basis (except for StySu, where the B3LYP functional and 6-31G basis were used). [48][49][50][51][52][53][54] AC-chip calorimetry (ACC), employing XEN-39390 chips from Xensor Integration, was conducted using a set-up from the group of Prof. Schick at the University of Rostock as described in ref.…”

Section: Measurement Techniquesmentioning

confidence: 99%

Charge transport and glassy dynamics in polymeric ionic liquids as reflected by their inter- and intramolecular interactions

et al. 2019

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Polymeric ionic liquids (PILs) form a novel class of materials in which the extraordinary properties of ionic liquids (ILs) are combined with the mechanical stability of polymeric systems qualifying them for multifold applications. In the present study broadband dielectric spectroscopy (BDS), Fourier transform infrared spectroscopy (FTIR), AC-chip calorimetry (ACC) and differential scanning calorimetry (DSC) are combined in order to unravel the interplay between charge transport and glassy dynamics. Three low molecular weight ILs and their polymeric correspondents are studied with systematic variations of anions and cations. For all examined samples charge transport takes place by glassy dynamics assisted hopping conduction. In contrast to low molecular weight ILs the thermal activation of DC conductivity for the polymeric systems changes from a Vogel-Fulcher-Tammann-to an Arrhenius-dependence at a (sample specific) temperature T s 0 . This temperature has been widely discussed to coincide with the glass transition temperature T g , a refined analysis, instead, reveals T s 0 of all PILs under study at up to 80 K higher values. In effect, below the T s 0 charge transport in PILs becomes more efficient -albeit on a much lower level compared to the low molecular weight pendants -indicating conduction paths along the polymer chain. This is corroborated by analysing the temperature dependence of specific IR-active vibrations showing at T s 0 distinct changes in the spectral position and the oscillator strength, whereas other molecular units are not affected. This leads to the identification of charge transport responsive (CTR) as well as charge transport irresponsive (CTI) moieties and paves the way to a refined molecular understanding of electrical conduction in PILs.platinum sensor to determine the water content of the P(ILs) after synthesis. HYDRANAL Coulomat AG water standards from Riedel-de Haën were used for calibration.

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Editorial

Cited by 4 publications

References 13 publications

Self‐Assembly Directed Organization of Nanodiamond During Ionic Liquid Crystalline Polymer Formation

Self‐Assembly Directed Organization of Nanodiamond During Ionic Liquid Crystalline Polymer Formation

Solvation of AgTFSI in 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid investigated by vibrational spectroscopy and DFT calculations

Charge transport and glassy dynamics in polymeric ionic liquids as reflected by their inter- and intramolecular interactions

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