Protonated betaine bis(trifluoromethylsulfonyl)imide is an ionic liquid with the ability to dissolve large quantities of metal oxides. This metal-solubilizing power selective. Soluble are oxides trivalent rare earths, uranium(VI) oxide, zinc(II) cadmium(II) mercury(II) nickel(II) copper(II) palladium(II) lead(II) manganese(II) and silver(I) oxide. Insoluble or very poorly soluble iron(III), manganese(IV), cobalt oxides, as well aluminum oxide silicon dioxide. The metals can be stripped from...

Liquid-crystalline blue phases exhibit exceptional properties for applications in the display and sensor industry. However, single component systems, they are stable only very narrow temperature range between isotropic chiral nematic phase, a feature that severely hinders their applicability. Systematic high-resolution calorimetric studies reveal phase III is effectively stabilized wide by mixing surface-functionalized nanoparticles with liquid crystals. This effect present two crystals,...

The electrical conductivities of 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids and 1-hexyl-3-methylimidazolium with different anions were determined in the temperature range between 123 393K on basis dielectric measurements frequency from 1to107Hz. Most form a glass conductivity values obey Vogel-Fulcher-Tammann equation. transition temperatures are increasing length alkyl chain. fragility is weakly dependent chain but highly sensitive to structure anion.

The effective thermal diffusivity of metal powders in air at room temperature is measured by the photopyroelectric technique. conductivity calculated from diffusivity, relative density, and specific heat obtained literature. Maxwell’s model a good prediction but underestimates conductivity, especially for irregular particles. Due to large difference between metals air, mainly determined density powder bed not properties material. A theoretical showing influence grain size gas pressure...

The phase transition behavior of the liquid crystal dimer α,ω-bis(4,4'-cyanobiphenyl)nonane (CBC9CB), which has been reported to exhibit a nematic-nematic transition, investigated by means high-resolution adiabatic scanning calorimetry. This is weakly first-order with latent heat 0.24±0.01 kJ kg(-1). Mixtures up 40 wt % 4-pentyl-4'-cyanobiphenyl (5CB) crystals have also investigated, show this nematic transition. stays decreasing increasing concentration 5CB. For mixtures more than uniaxial...

The ionic liquid (2-hydroxyethylammonium)trimethylammonium) bis(trifluoromethylsulfonyl)imide (choline bistriflimide) was obtained as a supercooled at room temperature (melting point = 30 °C). Crystals of choline bistriflimide suitable for structure determination were grown from the melt in situ on X-ray diffractometer. cation adopts folded conformation, whereas anion exhibits transoid conformation. and are held together by hydrogen bonds between hydroxyl proton sulfonyl oxygen atom. This...

Abstract The aim of this work was to synthesize silver nanoparticles (NPs) through a green synthesis method using starch as capping agent. influence the glucose content, temperature, and pH on size NPs evaluated by means response surface methodology. obtained nanomaterials were characterized UV–Vis spectroscopy, XRD, TEM, crystalline structure determined XRD. optimum time after 3 h reaction colloidal solution, did not show any further significant variation in optical absorption peak ( λ max...

This paper presents a novel ultra-lightweight micro-perforated sandwich structure with face-centered cubic (FCC) core as sound absorber, which encompasses excellent mechanical features well acoustic properties. The structure, consists of air cavities and small perforations on both the top panel corrugated plates, is considered combination multi-layered absorbers (MPPAs). A theoretical model that makes use an equivalent electrical circuit (EEC) approach established. Validation experimental...

We describe the order parameter S(T) of liquid crystals in nematic state by a four-parameter expression which is consistent with mean-field theory. A two-step fitting method applied to high resolution refractive index data for nCB (n=5–8) crystals, processed according Vuks and Neugebauer models. find quasi-universal values. The average critical exponent β=0.241±0.012, agreement prediction tricritical point. Thus temperature dependence quasi-tricritical all cases. at effective transition...

Six ionic liquids based on the 1-butyl-3-methylimidazolium cation have been studied. As anions Cl−, Br−, I−, [NCS]−, [N(CN)2]−, and [BF4]− were selected. The electrical conductivities determined between 173 393 K impedance measurements in frequency range from 0.1 to 107 Hz. conductivity increases, whereas glass transition temperature, fragility, low temperature activation energy decrease with increasing anion size. results can be understood changing anion-cation interaction strength size...

It is demonstrated that interactions between nanoparticles and topological defects induce a twist-grain boundary phase in chiral liquid crystal. The occurrence of this phase, the analogue Shubnikov type-II superconductors, driven by direct surface-functionalized CdSe quantum dots screw dislocations. shown that, within an adaptive-defect-core-targeting mechanism, appropriate size functionalization adapt to qualitatively different cores such as disclination lines This mechanism enables...

The idea that rodlike molecules possessing an electric dipole moment could exhibit a ferroelectric nematic phase was suggested more than century ago. However, only recently such has been reported for two quite different liquid crystals: RM734 [4-[(4-nitrophenoxy)carbonyl)]phenyl 2,4-dimethoxybenzoate] and DIO [2.3',4',5'-tetrafluoro[1,1'-biphenyl]-4-yl 2.6-difluoro-4-(5-propyl-1,3-dioxan-2-yl) benzoate]. For direct (N_{F}) to classical N transition reported, whereas intermediate N_{x}...

Osteoarthritis (OA) significantly influences chondrocyte behavior, yet its impact on active cell-generated forces, a key indicator of cell-matrix interaction, remains poorly understood. In this study, we used traction force microscopy (TFM) and immunostaining to explore how culture dimensionality (2D versus 3D) affects cell phenotype contractile dynamics in human articular chondrocytes from both OA non-OA patients. Our findings reveal that alters proteins involved exertion transmission...

Correlations between material properties are useful in engineering, and addition, the underlying common mechanisms allow for a better understanding of origins properties. Properties related to phase changes an example, being important, e.g., thermodynamic applications. For n-alkanes used, as change materials thermal energy storage, linear correlations enthalpy entropy transitions, well number carbon atoms n, have been observed described by many researchers. Different odd even n were found,...

Laser ultrasonics is used to optically excite and detect acoustic waves at the interface between a liquid solid or coated solid. Several case studies show that this technique feasible investigate experimentally theoretically predicted fundamental properties of different aspects liquid-solid interfaces characterize elastic soft solids. The theoretical prediction leaky Rayleigh (LR)-type root characteristic determinant becomes forbidden when shear velocity lies below bulk was confirmed. depth...

Photothermal techniques offer a nice tool for the determination of changes in thermal parameters different types samples. Using very thin pyroelectric transducer, simple and versatile ac calorimeter can be built. The described inverse technique allows high-resolution ac-calorimetric measurements temperature dependence specific heat capacity. Since measuring frequencies up to few hertz used, which are higher than most alternative setups, noise reduced times shortened. With small modification...

The concept of viscous characteristic length is used to describe the acoustical behavior fluid-saturated porous media in high-frequency regime. A method determine this parameter consists measuring wave attenuation limit. This has already been for materials saturated by superfluid 2He. It tested case air-filled absorbent a frequency range [50–600 kHz]. thermal assumed be known or measured independently. Two examples are presented. In first one usable and Λ deduced from per cycle. second...

High-resolution calorimetric techniques have substantially contributed in characterising and understanding the delicate thermal behaviour near many phase transitions liquid crystals. In this paper we describe a high-resolution adiabatic scanning technique that has proven to be an important tool discriminating between first-order second-order addition rendering information on fluctuations-induced pretransitional specific heat capacity behaviour. The capabilities of calorimetry are illustrated...

Full-field dynamic shearography and laser Doppler vibrometric scanning are used to investigate the local contact acoustic nonlinear generation of delamination-induced effects on vibration a harmonically excited composite plate containing an artificial defect. Nonlinear elastic behavior caused by stress-dependent boundary conditions at delamination interfaces circular defect is also simulated 3-D second-order, finite-difference, staggered-grid model (displacement-stress formulation). Both...

Ionic liquids with an ether-functionalised cation and the bis(2-ethylhexyl)phosphate anion show thermomorphic behaviour in water, a lower critical solution temperature. These ionic are useful for homogeneous liquid-liquid extraction of first-row (3d) transition metals.

We report on the use of heat transfer method, a novel surface‐sensitive technique based through solid–liquid interfaces, to detect phase transitions model lipid membranes. selected DPPC because its rich behavior in an experimentally accessible temperature range. The vesicles were adsorbed nanocrystalline diamond films, known as versatile platform material for biosensing with outstanding heat‐conduction properties. Complementary Peltier‐element‐based adiabatic scanning calorimetry (pASC) and...