Month: November 2022

Tamura, Masazumi published the artcileSubstrate-Specific Heterogeneous Catalysis of CeO2 by Entropic Effects via Multiple Interactions, Application of 2-Methoxyacetamide, the main research area is Substrate Specific heterogeneous catalysis ceria entropic effect multiple interaction; hydration reaction nitrogen heterocycle nitrile kinetics ceria carboxamide; enzyme inspired synthetic catalyst.

Achieving complete substrate specificity through multiple interactions like an enzyme is one of the ultimate goals in catalytic studies. Herein, we demonstrate that multiple interactions between the CeO2 surface and substrates are the origin of substrate-specific hydration of nitriles in water by CeO2, which is exclusively applicable to the nitriles with a heteroatom (N or O) adjacent to the α-carbon of the CN group but is not applicable to the other nitriles. Kinetic studies reveal that CeO2 reduces the entropic barrier (TΔS‡) for the reaction of the former reactive substrate, leading to 107-fold rate enhancement compared with the latter substrate. D. functional theory (DFT) calculations confirmed multiple interaction of the reactive substrate with CeO2, as well as preferable approximation and alignment of the nitrile group of the substrate to the active OH group on CeO2 surface. This can lead to the reduction of the entropic barrier. This is the first example of an entropy-driven substrate-specific catalysis of a nonporous metal oxide surface, which will provide a new design strategy for enzyme-inspired synthetic catalysts.

ACS Catalysis published new progress about Activation energy. 16332-06-2 belongs to class ethers-buliding-blocks, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Application of 2-Methoxyacetamide.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Delnick, Frank M. published the artcileInvestigation of Complex Intermediates in Solvent-Mediated Synthesis of Thiophosphate Solid-State Electrolytes, Category: ethers-buliding-blocks, the main research area is solvent mediated synthesis thiophosphate solid state electrolyte.

Lithium thiophosphates represent a promising class of solid Li+ conductors for all-solid-state batteries. Scalable solvent-mediated synthesis routes for several Li-P-S ternary compounds have been reported, but little is known regarding the reaction mechanism of such pathways. This work demonstrates that solvent-mediated synthesis of lithium thiophosphate solid electrolytes from mixtures of Li2S and P2S5 proceeds through a highly soluble P2S62- intermediate. This intermediate exhibits virtually the same Raman spectra in several solvents including acetonitrile, Me acetate, Et acetate, Et propionate, dimethoxyethane, tetraethylene glycol di-Me ether, and THF. Based on this universal intermediate, a general reaction mechanism is proposed for the solvent-mediated synthesis of several lithium thiophosphates including (LiPS3)n, Li2P2S6, Li7P3S11, and Li3PS4.

Journal of Physical Chemistry C published new progress about Solid electrolytes. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Category: ethers-buliding-blocks.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Price, Terry L. published the artcileIon Conducting ROMP Monomers Based on (Oxa)norbornenes with Pendant Imidazolium Salts Connected via Oligo(oxyethylene) Units and with Oligo(ethyleneoxy) Terminal Moieties, Name: 2,5,8,11-Tetraoxatridecan-13-ol, the main research area is ion conducting ROMP monomer oxanorbornene imidazolium oxyethylene ethyleneoxy.

A matrix of 22 two-armed norbornene-based imidazolium TFSI monomers (8) was synthesized to determine the optimal structure in terms of single ion conductivity For the chain tethering the imidazolium ring to the norbornene ring three or four oxyethylene units are optimal. A terminal group of two ethyleneoxy units was optimal. NMR studies indicated that both the tether oxyethylene units and the terminal ethyleneoxy units interact with the imidazolium cation via hydrogen bonding. 8r (X = 4, Y = 2) exhibited a conductivity of 9.57 × 10-5 S/cm at 25 °C and a Tg of -46 °C. Low Tg values do not correlate with higher conductivity as a result of the H-bonding interactions. Stability toward autopolymn. and reasonable conductivities provide an acceptable platform for ion conducting ROMP polymers. Four one-armed norbornene-based imidazolium TFSI monomers (15) were prepared with tetra(ethyleneoxy) linkers/spacers and variable terminal groups. All of these exhibited low Tgs (<-55 °C) and room temperature conductivities >10-4 S/cm, the highest being 4.39 × 10-4 S/cm for 15c (Tg = -69 °C), the analog of 8r, providing hope for outstanding polymers. Three oxanorbornene-based two-armed imidazolium TFSI monomers (18) were prepared with varied linkers and terminal groups. 18b possesses a room temperature conductivity of 1.2 × 10-4 S/cm, again augering well for polymers derived therefrom by ROMP.

Macromolecules (Washington, DC, United States) published new progress about Ionic conductivity. 23783-42-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11-Tetraoxatridecan-13-ol, and the molecular formula is C9H20O5, Name: 2,5,8,11-Tetraoxatridecan-13-ol.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Kim, Dowan published the artcileControlled Phase Separation in Poly(p-phenyleneethynylene) Thin Films and Its Relationship to Vapor-Sensing Properties, Recommanded Product: 2,5,8,11-Tetraoxatridecan-13-ol, the main research area is phase separation polyphenyleneethynylene thin film vapor sensing porous.

In this paper, we report the synthesis and mesoporous film formation of hydrophobic rodlike poly(p-phenyleneethynylene)s (PPEs) (I) and present porosity-dependent quenching studies using 1,3,5-trinitrotoluene (TNT) vapors. Nonsolvent vapor-induced phase separation was used to induce pore formation during film casting, and the concentration of PPEs in the casting solution was controlled carefully to prevent excimer formation. We found that the structures of the sidechains of the PPEs strongly influence the range of relative humidity at which controlled pore generation occurs, which could be rationalized from interfacial energies calculated from contact angle measurements. Porosity of the PPE films resulted in increased efficiency of fluorescence quenching toward TNT vapors, which previously required very thin films (below 5 nm) for sensing applications. The control of the porous structure as well as film thickness constitutes a promising strategy for enhancing the efficiency of chemosensors and in more general applications requiring fine-tuned polymer-gas interactions.

Langmuir published new progress about Films (Mesoporous). 23783-42-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11-Tetraoxatridecan-13-ol, and the molecular formula is C9H20O5, Recommanded Product: 2,5,8,11-Tetraoxatridecan-13-ol.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Nishino, Haruka published the artcileIonic transport and mechanical properties of slide-ring gel swollen with Mg-ion electrolytes, Application In Synthesis of 143-24-8, the main research area is slide ring gel electrolyte swelling ionic transport mech property.

The authors applied a slide-ring (SR) gel to a Mg2+ ion gel electrolyte and clarified the elec. and mech. properties in order to achieve a Mg2+ ion gel electrolyte with both sufficient mech. strength and high ionic conductivity The SR gel is made from polyrotaxane, which has a structure that consists of cyclic mols., α-cyclodextrins (CDs), threaded by an axial polymer chain, polyethylene glycol (PEG), and crosslinked by divinyl sulfone. Pure glymes and tetraethylene glycol di-Me ether (tetraglyme: G4) dissolving Mg2+ ions had no ability to swell the SR gel, whereas diethylene glycol di-Me ether (diglyme: G2) and triethylene glycol di-Me ether (triglyme: G3) dissolving Mg2+ ions were able to swell the SR gel. The swelling behavior was strongly dependent on the interaction between Mg2+ ions complexed with glymes and ether oxygens of a PEG-based hydroxypropyl PR (HyPR) network. Upon tensile elongation, SR gel swollen with G3 solution dissolving Mg2+ ions could be extended by 300%, which indicated the unique property of high ductility. The ionic conductivity of SR gel swollen with G3 dissolving Mg2+ ions, which approx. satisfied a Vogel-Tamman-Fulcher (VTF) dependence, was 1.73 mS cm-1 at room temperature, and the molar conductivity was 67% of that for a pristine G3 solution dissolving Mg2+ ions.

Ionics published new progress about Electric impedance. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Application In Synthesis of 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Fuladi, Shadi published the artcileMulticomponent Phase Separation in Ternary Mixture Ionic Liquid Electrolytes, Quality Control of 143-24-8, the main research area is phase separation mixture ionic liquid solvent lithium salt MD.

We investigate the phase behavior of ternary mixtures of ionic liquid, organic solvent, and lithium salt by mol. dynamics simulations. We find that at room temperature, the electrolyte separates into distinct phases with specific compositions; an ion-rich domain that contains a fraction of solvent mols. and a second domain of pure solvent. The phase separation is shown to be entropy-driven and is independent of lithium salt concentration Phase separation is only observed at microsecond time scales and greatly affects the transport properties of the electrolyte.

Journal of Physical Chemistry B published new progress about Diffusion (of Li+). 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Quality Control of 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Thangavel, Vigneshwaran published the artcileUnderstanding the Reaction Steps Involving Polysulfides in 1 M LiTFSI in TEGDME : DOL Using Cyclic Voltammetry Experiments and Modelling, Application In Synthesis of 143-24-8, the main research area is lithium bistrifluoromethanesulfonylimide tetraethylene glycol dimethy ether dioxolane cyclic voltammetry.

The reaction mechanisms of polysulfides in the electrolytes of lithium sulfur (Li-S) batteries are known to be complex. These reaction mechanisms may also change with the electrolyte used. Understanding the reaction steps of the polysulfides in a Li-S battery electrolyte is important to assess the underlying phenomena behind the Li-S cell performance limitations. Here, we investigate the reaction steps of polysulfides in electrolyte solutions containing S8, Li2S8 and Li2S6 in 1 M LiTFSI in TEGDME : DOL (volume/volume 1 : 1) (one of the most interesting electrolytes for use in Li-S batteries), using exptl. cyclic voltammetry and a math. model. The math. model assists in understanding the reaction steps behind the characteristics changes of cyclic voltammograms (CVs) with the scan rate and polysulfides speciation. Our systematic study shows that the reaction steps conventionally used in Li-S battery models are not sufficient to simulate all the CV characteristics of the investigated electrolyte solutions

Batteries & Supercaps published new progress about Cyclic voltammetry. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Application In Synthesis of 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Cao, Deqing published the artcileThreshold potentials for fast kinetics during mediated redox catalysis of insulators in Li-O2 and Li-S batteries, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane, the main research area is insulator threshold potential redox catalysis lithium sulfur battery.

Redox mediators could catalyze otherwise slow and energy-inefficient cycling of Li-S and Li-O2 batteries by shuttling electrons or holes between the electrode and the solid insulating storage materials. For mediators to work efficiently they need to oxidize the solid with fast kinetics but with the lowest possible overpotential. However, the dependence of kinetics and overpotential is unclear, which hinders informed improvement. Here, we find that when the redox potentials of mediators are tuned via, for example, Li+ concentration in the electrolyte, they exhibit distinct threshold potentials, where the kinetics accelerate several-fold within a range as small as 10 mV. This phenomenon is independent of types of mediator and electrolyte. The acceleration originates from the overpotentials required to activate fast Li+/e- extraction and the following chem. step at specific abundant surface facets. Efficient redox catalysis at insulating solids therefore requires careful consideration of the surface conditions of the storage materials and electrolyte-dependent redox potentials, which may be tuned by salt concentrations or solvents.

Nature Catalysis published new progress about Cyclic voltammetry. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Zhang, Wenjing published the artcileWater-Induced Surface Reconstruction of Co3O4 on the (111) Plane for High-Efficiency Li-O2 Batteries in a Hybrid Electrolyte, Computed Properties of 143-24-8, the main research area is cobalt oxide cathode catalyst lithium oxygen battery; Co3O4; LiOH; Li−O2 battery; cathode catalyst; crystal plane effect.

The crystal plane effect of cobalt oxide has attracted much attention in Li-O2 batteries (LOBs) and other electrocatalytic fields. However, boosting the catalytic activity of a specific plane still faces significant challenges. Herein, a strategy of adding water into the electrolyte is developed to construct a LiOH-based Li-O2 battery system using the (111) plane-exposed Co3O4 as a cathode catalyst. The electrochem. performance shows that on the (111) plane, in the presence of water, the overpotential is largely reduced from 1.5 to 1.0 V and the cycling performance is enhanced. It is confirmed that during the discharge process, water reacts to form LiOH and induce the phase transformation of Co3O4 to amorphous CoOx(OH)y. At the recharge stage, LiOH is first decomposed and then CoOx(OH)y is reduced to Co3O4. Compared with pristine (111), the newly formed Co3O4 surface exhibits more active sites, which accelerates the following oxygen reduction and oxygen evolution processes. This work not only reveals the reaction mechanism of water-induced reaction on the (111) plane of Co3O4 but also provides a new perspective for further design of hybrid Li-O2 batteries with a low polarization and a longer cycle life.

ACS Applied Materials & Interfaces published new progress about Counter electrodes. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Computed Properties of 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Jozwiak, Malgorzata published the artcileHeat capacity of six glymes in N,N-dimethylformamide + water mixtures. Solvation of glymes, Related Products of ethers-buliding-blocks, the main research area is glymes DMF water mixture solvation heat capacity.

The paper presents the heat capacities of glyme solutions: monoglyme, diglyme, triglyme, tetraglyme, pentaglyme and hexaglyme, in binary solvents N,N-dimethylformamide + water at four temperatures (293.15 K, 298.15 K, 303.15 K, 308.15 K) obtained using differential calorimeter Micro DSC III, Setaram – France. The concentration of glymes was approx. 0.25 mol/kg. On the basis of the obtained exptl. results, the apparent isobaric heat capacities of the glymes were calculated It was noted that the larger the glyme mol. was, the more pronounced the increase in the value of the apparent molar heat capacity function with the increase in water content in the two-component solvent. The observed changes in apparent isobaric heat capacity as a function of the water content in the mixed solvent are discussed in terms of the hydrophobic nature of the glymes. Moreover, it was shown that the apparent molar isobaric heat capacity of the glymes in pure solvents, i.e. in water and in N,N-dimethylformamide, increases linearly with the increase in the number of oxygen atoms in the glyme mols. i.e. with the size of glyme mols. Furthermore, a linear correlation was observed between the apparent isobaric molar heat capacity and the enthalpic effect of the hydrophobic hydration of the studied glymes at 298.15 K. The results obtained in this paper are compare with the same obtained for selected cyclic ethers.

Journal of Molecular Liquids published new progress about Correlation energy. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Related Products of ethers-buliding-blocks.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem