Structure Maker Research Articles

Characterization of complexation of uracil with peptides through its volumetric properties in buffer saline solution at different temperatures

Densities of mixtures of uracil (Ura) with glycyl-glycine (GlyGly) and glycyl-phenylalanine (GlyPhe) in a buffered saline (pH 7.4) were measured at T=(288.15, 293.15, 298.15, 303.15, 308.15 and 313.15) K using the density meter DMA 5000 M (Anton Paar). The apparent molar volumes, limiting apparent molar volumes at infinite dilution and their derivatives with respect to temperature have been evaluated. Interactions of uracil (Ura) with glycylpeptides (GlyGly, GlyPhe, GlyTyr, GlyGlu) were studied with using review volumetric properties obtained early for Ura in GlyTyr and GlyGlu buffered solutions. The effect of concentration, ionic state and hydrophobicity of reagents on the Ura volume properties were discussed. The results indicate the complex formation between Ura and glycylpeptides with 1:1 stoichiometry. It was shown that the complexation of uracil with the glycylpeptides is accompanied by the positive changes of molar volume of Ura. The positive values of Hepler parameter indicate an increase in the ordering of the solvent in the environment of uracil with the addition of peptides. Uracil acts as a structure maker and its structure-making ability increases in series: Ura < GlyPhe < GlyGly < GlyGlu < GlyTyr.

Facile and fast construction of biomimetic, waterborne, and superhydrophobic coatings via spraying strategy

Typically, the preparation of superhydrophobic coatings may release a large amount of volatile organic compounds (VOCs), which will be potentially harmful to the environment. In this condition, waterborne coatings have gradually become the main method to replace the traditional organic solvent-based coatings in recent years. Inspired by natural superhydrophobic phenomena, biomimetic, waterborne, and superhydrophobic coatings with multi-functional integration have been prepared via a one-step pneumatic spraying technique in this paper. The coatings were mainly composed of solvent (water), low surface energy substances (polytetrafluoroethylene emulsion (PTFE)), binding agents (waterborne silicone resin (WSR)), rough structure maker (polyphenylene sulfide (PPS) and graphene powder (GP)), and filler dispersion agent (dodecyl phenyl polyoxyethylene (OP-10)). Owing to the formation of hierarchical micro/nano-scaled structure covered with low surface energy, the water contact angle (WCA) and water sliding angle (WSA) values of as-prepared coatings can reach 155.5° ± 1.1° and 9.2° ± 0.3°, respectively. This is feasible for endowing the coatings with rich surface functionalities such as self-cleaning properties, anti-icing ability, anti-corrosion properties, and oil-water separation. Furthermore, the adequate durability and stability of as-prepared coatings have been confirmed by a series of mechanical and chemical damage tests. The super-hydrophobicity can be retained even after 12 m sandpaper abrasion, 24 h continuous UV irradiation and acid/alkali immersion tests. Thus, this article has provided an effective and simplified strategy for preparing multifunction-integrated and waterborne superhydrophobic coatings, which will extend its potential application in many daily life and industrial fields.

Density and coefficients of Jones–Dole equation for viscosity measurement of l-isoleucine, l-proline, and l-glutamine in aqueous KCl solution at 298.15–323.15 K

The present studies reported the experimental data on thermophysical properties such as density and viscosity of aqueous solutions of different amino acids namely l-isoleucine, l-proline, and l-glutamine in 1.5 mol/L KCl solution at different temperatures ranging from 298.15 to 323.15 K. Hence, the aim of this study is to investigate interactions between amino acids and KCl solution at dilute concentrations. For understanding amino acid and KCl solution interactions, we will investigate ion–ion and ion–solvent interactions. It has been observed that the density and viscosity rise with amino acid concentration and decrease with temperature. Using the Jones–Dole equation, the viscosity A and B coefficients have been determined. The viscosity B-coefficient values for all the three amino acids in aqueous electrolyte system are depicted as positive. The positive values of B-coefficient indicate a strong alignment of the solvent molecules with solute molecules. The amino acid l-glutamine acts as a structure breaker solute. This structure breaking effect of l-glutamine on solvent may be attributed to the domination of hydrophilic nature of amide group. l-isoleucine and l-proline act as structure maker in electrolyte system.

On the dual behaviour of water in octanol-rich aqueous n-octanol mixtures: an X-ray scattering and computer simulation study.

Aqueous n-octanol (n = 1, 2, 3, and 4) mixtures from the octanol rich side are studied by X-ray scattering and computer simulation, with a focus on structural changes, particularly in what concerns the hydration of the hydroxyl-group aggregated chain-like structures, under the influence of various branching of the alkyl tails. Previous studies have indicated that hydroxyl-group chain-cluster formation is hindered in proportion to the branching number. Here, water mole fractions up to x = 0.2 are examined, i.e. up to the miscibility limit. It is found that water molecules within the hydroxyl-chain domains participate in the chain formations in a different manner for 1-octanol and the branched octanols. The hydration of the octanol hydroxyl chains is confirmed by the shifting of the scattering pre-peak position kPP to smaller values, both from measured and simulated X-ray scattering intensities, which corresponds to an increased size of the clusters. Experimental pre-peak amplitudes are seen to increase with increasing water content for 1-octanol, while this trend is reversed in all branched octanols, with the amplitudes decreasing with the increase of the branching number. Conjecturing that the amplitudes of pre-peaks are related to the density of the corresponding aggregates, these results are interpreted as water breaking large OH hydroxyl chains in 1-octanol, hence increasing the density of aggregates, while enhancing hydroxyl aggregates in branched alcohols by inserting itself into the OH chains. The analysis of the cluster distributions from computer simulations provide more details on the role of water. For cluster sizes smaller than dc = 2π/kPP, water is found to always play the role of a structure enforcer for all n-octanols, while for clusters of size dc water is always a destructor. For cluster sizes larger than dc, the role of water differs from 1-octanol and the branched ones: it acts as a structure maker or breaker in inverse proportion to the hindering of OH hydroxyl chain structures arising from the topology of the alkyl tails (branched or not).

The structure maker-structure breaker categories for aqueous electrolytes signify strength of Lewis acidity/basicity relative to water

Small, dissolved ions are commonly categorized as “structure makers” or “structure breakers” based on the implicit assumption that they alter the structure of bulk water. Many authors have questioned the structure maker-structure breaker lexicon, even though the categorization correctly identifies the effects of ions on transport properties. A plethora of studies indicate that the largest impact of ions on water structure occur within one or two water molecules of the ions. The short-range nature of these specific ion effects led the present author to determine if these categories could be defined by ions’ Lewis acidities or basicities relative to water using the bond-valence model. This study found that structure breaking ions are those whose Lewis acidities or basicities were much weaker than water and thus bound water less strongly than water binds to itself. Structure makers are those ions whose Lewis strength was much greater than water’s, leading to stronger binding of water to the ions than water binds to itself. Ions can thus be categorized by their Lewis strength rather than ambiguous structure making or breaking capability.

Inhibition of Aqueous Chemical Reactions by Strong Liquid Structure Makers: Experimental Demonstration with Amides and Acid-Base Reactions.

The chemical absorption of CO2 and H2S in aqueous tertiary amines is a well-known acid-base reaction. Kinetic and vapor-liquid equilibrium experiments show that the addition of an amide such as HMPA, which is known to be a strong liquid structure maker, significantly inhibits the acid-base reactions. The impact is more pronounced for CO2 than for H2S absorption. Despite the presence of water in the solvent, the absorption becomes almost physical. Due to hydrogen bonding and the hydrophobic effect, each amide molecule is involved in a cluster containing several water molecules, thus rendering the water molecules less available to participate in the reaction and to solvate HS- and HCO3- ions. This effect is absent when ethylene glycol, a weak structure maker, is added, even in large quantities. This study demonstrates the importance of solvent structure in the study of chemical reactions. State-of-the-art molecular dynamics simulations of the water-HMPA system could not reproduce the strongly negative excess volume of the mixture. This illustrates the need for more accurate force fields to simulate the structuring effect and their impact on chemical reactions.

Volumetric and viscometric properties of L-glutamic acid in aqueous L-arabinose and D-xylose solutions between the temperature range of (293.15–313.15) K at atmospheric pressure

To investigate the molecular interaction among nonessential amino acids and carbohydrates in this article we report the density and viscosityresultsof L-glutamic acid in aqueous solutions of L-arabinose and D-xylose over an integral composition regime (2.00 wt%, 2.50 wt% and 3.01 wt%)at atmospheric pressure (101 kPa) and at temperature range of 293.15, 298.15, 303.15, 308.15 and 313.15 K. The experimental density values were used to evaluate apparent molal volume (V∅), partial apparent molal volume (V∅0), limiting apparent molal expansibility (E∅0) and Hepler’s constant (∂2V∅0/∂T2)P. The values of viscosity were used to calculate viscosity coefficients AF (Falkenhagen coefficients) and BJ (Jones-Dole coefficients), temperature derivative of BJ, Gibbs free energy of activation (Δμ10,#,Δμ20,#) and thermodynamic parameters like ΔH20# and ΔS20#. A thorough interpretation of the results obtained from the thermodynamic as well as physicochemical properties reveal a potent ion–solvent interactions in the aqueous solution of Glu andGlubehaves as a structure maker in the presence of L-arabinose/D-xylose.

Molecular interactions of diphenyldiselenide in DMSO and varied weight % of ethanol in DMSO solvent media at different compositions and temperatures (288.15 to 318.15)K

In the present work, volumetric, rheological, and thermodynamic analysis has been carried out for varied compositions of diphenyldiselenide in dimethyl sulfoxide/(5–25)% w/w of ethanol in dimethyl sulfoxide at seven distinct temperatures varying from 288.15 K to 318.15 K and ambient pressure (0.1 MPa). Through the acquired density data, the volumetric parameters such as apparent molar volume (Vϕ), limiting apparent molar volume (Voϕ), transfer molar volumes (Vϕ,tro), limiting apparent molar expansivity (Eϕo), thermal expansion coefficient (α), and Hepler’s constant (2c) were estimated. By the use of viscosity data, (viscosity A and B coefficients), viscosity B-coefficient of transfer (Btr), change in viscosity B-coefficient with temperature and thermodynamic properties (Δμ10,Δμ20, ΔH20 and TΔS20) were inferred. These parameters have aided in scrutinizing the various feasible interactions existing in the studied systems. From the explored results, we predicted that ion-hydrophillic / hydrophilic-hydrophillic interactions are predominant in the studied systems. Furthermore, through the positive sign of Hepler’s constant and negative sign of change in viscosity B-coefficient with temperature values, we have inferred that diphenyldiselenide behaves as structure maker in dimethyl sulfoxide/(5–25)% w/w of ethanol in dimethyl sulfoxide.

Interactions of ammonium based ionic liquids with DNA in aqueous medium through Volumetric, acoustic and viscometric properties

Ionic liquids (ILs) have emerged as a promising alternative solvent for DNA based studies as most of the studied ILs enhance the stability of DNA and act as a media for extraction and storage. Investigation of IL-DNA interactions through spectroscopic and computational analysis have been carried out earlier and we here attempt to explore the interaction through physicochemical properties of IL-DNA mixture in water medium that provide fundamental knowledge of the solvation behaviour. Properties such as density, ρ, speed of sound, u and viscosity, η, of two ILs, Benzyltributylammonium chloride ([BTBA]Cl) and Tetrabutylammonium bromide ([TBA]Br) in water as well as in aqueous DNA solutions with varying concentrations were measured over a temperature range from 293.15 − 323.15 K and at atmospheric pressure. The derived volumetric properties were calculated to understand the strength and extent of the solute–solvent interactions prevail in the solution. The analysis of partial molar volume at infinite dilution, V2∞, helped in the comparison of the strength of the interactions in between the studied solutes. The second derivative of V2∞ with respect to temperature, (∂2V2∞/∂T2)P facilitated in identifying the influence of the solutes in water structure formation around the solute and it was interesting to note that, although both the ILs behaved similarly in water as structure makers, [TBA]Br showed variation in the presence of DNA by demonstrating water structure breaking effects. Similar results were obtained from the analysis of viscometric properties as well. Further, the capability of the ILs to stay solvated in the DNA aqueous solution was confirmed by the results from the solvation number calculations.

Density anomaly in water-alcohol mixtures: Minimum model for structure makers and breakers.

We modeled the change in the temperature of maximum density (TMD) of a waterlike solvent when small amounts of solute are added to the mixture. The solvent is modeled as a two length scales potential, which is known to exhibit waterlike characteristic anomalies, while the solute is chosen to have an attractive interaction with the solvent which is tuned from small to large attractive potential. We show that if the solute exhibits high attraction with the solvent it behaves as a structure maker and the TMD increases with the addition of solute, while if the solute shows a low attraction with the solvent the TMD decreases, with the solute behaving as a structure breaker.

A comparative analysis of volumetric, viscometric and conductometric properties of Triethylmethylammonium Tetrafluoroborate (TEMABF4) and Tetraethylammonium Tetrafluoroborate (TEABF4) in pure propylene carbonate (PC) and binary aqueous propylene carbonate solvents

Electrolytes play a major role in electrochemical energy storage devices and specifically organic electrolytes are used predominantly over aqueous electrolytes due to wide electrochemical window, high energy density and efficiency. However, aqueous electrolytic systems for energy storage applications still need to be explored as these are non-flammable, environment friendly, non-toxic, carrying high ionic conductivity and low cost as compared to organic counterparts. In this study, an effort has been made in doing a comparative analysis of the physicochemical properties of Triethylmethylammonium Tetrafluoroborate (TEMABF4) and Tetraethylammonium Tetrafluoroborate (TEABF4) in pure propylene carbonate (PC) and binary aqueous mixtures of PC (0.01 &0.02 m) at different temperatures and concentrations. From this data, various volumetric, viscometric, and conductometric parameters have been calculated and the results obtained are analysed and compared in terms of solute–solute and solute–solvent interactions. From the analysis of thermo physical parameters, we have found that both the salts act as structure breaker in PC whereas structure maker in binary aqueous mixtures of PC (0.01 & 0.02 m). FTIR studies have also been done to see the intermolecular interactions and structural alterations. Furthermore, results from Cyclic Voltammetry (CV) studies suggested that a binary aqueous organic electrolytic system can also be a potential electrolytic system as its electrochemical window is comparable to that of pure electrolytic organic solvents.

Shining (Infrared) Light on the Hofmeister Series: Driving Forces for Changes in the Water Vibrational Spectra in Alkali–Halide Salt Solutions

The Hofmeister series is frequently used to rank ions based on their behavior from chaotropes ("structure breakers"), which weaken the surrounding hydrogen-bond network, to kosmotropes ("structure makers"), which enhance it. Here, we use fluctuation theory to investigate the energetic and entropic driving forces underlying the Hofmeister series for aqueous alkali-halide solutions. Specifically, we exploit the OH stretch infrared (IR) spectrum in isotopically dilute HOD/D2O solutions as a probe of the effect of the salt on the water properties for different concentrations and choice of halide anion. Fluctuation theory is used to calculate the temperature derivative of these IR spectra, including decomposition of the derivative into different energetic contributions. These contributions are used to determine the thermodynamic driving forces in terms of effective internal energy and entropic contributions. This analysis implicates entropic contributions as the key factor in the Hofmeister series behavior of the OH stretch IR spectra, while the effective internal energy is nearly ion-independent.

A temperature‐dependent hydrating structure around SO42− investigated from Raman spectroscopy

AbstractThe Raman spectra of H2O/D2O−Na2SO4 solutions are measured at temperatures (T) up to 573 K. The hydrating structure of SO42− is investigated based on the solute‐correlated (SC) OD/OH stretch bands obtained by the multivariate curve resolution method. Remaining a nearly constant wavenumber of the main peak with increasing temperature, the SC OD/OH bands are narrowed first due to the reduced relative intensity of the shoulder at 2395/~3245 cm−1 when T &lt; ~473 K/~513 K but then because the OD/OH bands get sunken around 2610/3580 cm−1 above ~473/~513 K (letting the ~2660/~3635 cm−1 mode be more prominent and even a separate peak). These spectral features incline to support a temperature‐dependent water structure in the SO42− hydration shell balanced by the SO42−···H2O(D2O) and O–H(D)···O hydrogen bonds (those with D are stronger) as well as the electrostatics. Most hydrating water molecules are engaged in hydrogen bonding configurations of single donor (SD) and single hydrogen‐bond water (SHW). As temperature rises, the average number of hydrogen bonds per hydrating water molecule decreases below ~373 K because of the SD → SHW transition and increases afterward owning to the rapid increase of the ion pairs, and SO42− changes its role from structure breaker to structure maker above ~453 K. The temperature‐dependent solubility behavior of Na2SO4 in H2O can be rationalized by the ion pairing effect and temperature‐dependent structure details in SO42− hydration shell.

Volumetric, acoustic and viscometric studies of trilithium and triammonium citrate in aqueous solutions of [Emim][HSO4] at different temperatures

In the present work the density, speed of sound and viscosity (ƞ) data for trilithium citrate and triammonium citrate in aqueous [Emim][HSO4] are determined experimentally over a range of concentration (0.0369–0.0514) mol kg−1 and temperature between 293.15 and 313.15 K. Using the density and speed of sound data the volumetric and compressibility parameters are evaluated. By graphical fitting of the evaluated parameters in some standard relations the partial molar parameters i.e. standard molar volumes (Voϕ) and standard molar compressibilities (K°ϕ,s) are calculated. The transfer parameters of volume (ΔtrV°ϕ) and compressibility (ΔtrK°ϕ,S) studies evaluated using the partial molar parameters are used to deduct the solute-solvent interactions by means of the cosphere overlap model which shows that the hydrophilic-hydrophilic and ion-hydrophilic interactions are less dominant in the solution over the hydrophobic-hydrophobic and ion-hydrophobic interactions. The viscosity data is utilized to calculate the relative viscosity (ηr) and viscosity B-coefficient. The Hepler’s constant and first temperature derivative of B-coefficients (dB/dT) has been used to analyze whether solute acts as structure maker or structure breaker in the solution.

Volumetric, acoustic and viscometric properties of l-leucine and glycyl-l-leucine in aqueous solutions of isoniazid at different temperatures

Amidst stupendously studies accomplished to unriddle the solute–solvent interactions, volumetric, acoustic and viscometric studies hold a consequential position. In the existing work, l-leucine and glycyl-l-leucine act as solute in aqueous isoniazid (solvent) in order to descry the solute–solvent interactions in the system at different temperatures and at atmospheric pressure. The experimental density has been employed in evaluating the volumetric parameters like apparent molar volume (Vϕ), limiting apparent molar volume (Voϕ), transfer parameters of volume (ΔtrV°ϕ) and limiting apparent molar expansibility (E°∅). The speed of sound has been applied in evaluating the compressibility parameters like apparent molar isentropic compression, limiting apparent molar isentropic compression (K°ϕ,s) and its transfer parameter (ΔtrK°ϕ,S). The transfer parameters deduct the interactions in the system on the behalf of co-sphere overlap model which shows dominating nature of the hydrophilic-hydrophilic interactions. Pair (VAB, KAB) and triplet (VABB, KABB) coefficient are also calculated. Using the viscosity data, the relative viscosity (ηr) and viscosity B-coefficient are calculated. The Hepler’s constant (∂E°∅/∂T) and first temperature derivative of B-coefficients (dB/dT) has been used to anatomize whether solute acts as structure maker or structure breaker in the solution.

Analysing the molecular interactions of ternary (lactose + water + tributylmethylammonium chloride) solutions at different temperatures via physicochemical methods

The interactions of lactose with tributylmethylammonium chloride (Bu3MeNCl) as the function of temperature have been studied by amalgamation of volumetric, acoustic and viscometric methods. Density, ultrasonic speed, and viscosity for varying concentrations of lactose in water and in (0.020, 0.039, 0.059, 0.079) mol.kg−1 aqueous solutions of Bu3MeNCl have been determined at five distinct temperatures (T = 293.15–313.15) K. These experimental values have been used to calculate apparent molar volume, Vϕ, limiting apparent molar volume, V0ϕ, apparent molar isentropic compression, Kϕ,s, limiting apparent molar isentropic compression, K0ϕ,s, viscosity B-coefficient, their transfer values, pair and triplet interaction coefficients, and hydration number nH. The Gibbs free energy of activation for solvent (Δµ01#) and Gibbs free energy of activation for lactose (Δµ02#) in water and in aqueous solutions of Bu3MeNCl have also been assessed and the obtained results support the outcome of volumetric, acoustic and viscometric parameters. These parameters provide better understanding of molecular interactions like solute-solute, solute-solvent interactions present in the systems. Further, it helps in determining structural and functional properties of studied systems and acquired results revealed that the solutions are characterized predominantly by solute-solvent interactions. Also, the values of second derivative of limiting apparent molar volume with respect to temperature indicated that the lactose monohydrate behaves as a structure maker in aqueous tributylmethylammonium chloride solutions.

Stable superhydrophobic wood surface constracting by KH580 and nano-Al2O3 on polydopamine coating with two process methods

Superhydrophobic treatment of wood is of great significance for improving the service life of wood and expanding its application fields. In this study, two process methods were designed to meet above requirements. Using polydopamine (PDA), 3-mercaptopropyltriethoxysilane (KH580) and nano-Al2O3 as the micro-nano structure maker and octadecyltrichlorosilane (OTS) as a low surface free energy agent to modify rough surface in order to prepare superhydrophobic wood samples (Wood@One-step and Wood@Two-step). The contact angle (CA) and sliding angle (SA) of the Wood@One-step were 155.3° and 4.76°, respectively; the CA and SA of the Wood@Two-step were 152.9° and 7.65°, respectively. Surface electron microscopy (SEM) images showed that the surface of Wood@One-step and Wood@Two-step were honeycomb structure and layered stacking structure respectively. The superhydrophobic properties of Wood@One-step were superior because of its more reasonable micro-nano roughness. Atomic force microscope (AFM) images presented that the nano-Al2O3 particles could effectively provide nano-level roughness. X-ray photoelectron spectroscopy (XPS) analysis showed that KH580 had covalent interaction with PDA. Thermogravimetric (TG) analysis, the immersion of acid-base solution and organic solution revealed that obtained superhydrophobic wood samples had excellent stability in the face of environmental challenges.

Study on interactions of amino acid with food additive ammonium acetate: An environment friendly approach

Considering the biological importance of amino acids and proteins, the objective of this work is to study the physico-chemical and thermodynamic properties of amino acid with food additives. Volumetric studies were performed on a nonessential amino acid, glutamic acid (Glu) solutions of different concentrations in water and aqueous ammonium acetate (AA) at T = 293.15–313.15 K. AA is used as a biodegradable deicing agent. Parameters like density, apparent molar volume and partial molar volume conclude that stronger ion-ion, ion-hydrophilic and hydrophilic-hydrophilic interactions between zwitterionic centers (COO- and NH3+) and polar groups of Glu (COOH and NH2) and ions present in aqueous AA dominate the hydrophobic interactions. Structure making or breaking properties of Glu in absence and in presence of AA in solution were estimated in terms of temperature derivatives of apparent molar volume at infinite dilution. Glu is found to act as a structure maker in aqueous solution whereas the presence of ions of AA hinders the structure making ability of Glu. Existence of ion pair interactions are established between ionic end groups of Glu and AA in solution. The results of the study showed the type and extent of interactions between Glu and AA and suggest that appropriate quantity of food additives should be present in water bodies to minimize toxicity of aquatic environment.

Physicochemical studies of L-valine and L-isoleucine in aqueous solutions of [Emim][HSO4] at different temperatures

The present work deals with experimental determination of density, speed of sound and viscosity (ƞ) data for L-valine and L-isoleucine in aqueous [Emim][HSO4] over range of concentration (0.0301–0.0702) mol kg−1 and temperature (293.15–313.15 K). The density and speed of sound data are used to evaluate the volumetric and compressibility parameters. Through the graphical fitting of the evaluated parameters in some standard relations the limiting apparent molar volume (Voϕ) and Limiting apparent molar isentropic compression (K°ϕ,s) are calculated. The transfer parameters of volume (ΔtrV°ϕ) and compressibility (ΔtrK°ϕ,S) studies evaluated using the limiting apparent molar parameters are used to deduct the solute–solvent interactions by means of the cosphere overlap model which shows that the hydrophilic-hydrophilic and ion-hydrophilic interactions are less dominant in the solution over the hydrophobic-hydrophobic and ion-hydrophobic interactions. The viscosity data is utilized to calculate the relative viscosity (ηr) and viscosity B-coefficient. The Helper’s constant and first temperature derivative of B-coefficients (dB/dT) has been used to analyze whether solute acts as structure maker or structure breaker in the solution.

Evaluation of possible interactions for ionic liquids [Emim][HSO4] and [Bmim][BF4] in aqueous sorbitol solutions at T = (293.15–313.15) K by volumetric data

Our systematic volumetric studies on the aqueous solutions containing ionic liquids and carbohydrates is followed in this research by consideration of the ternary (1-butyl-3-methylimidazolium tetrafluoroborate or 1-ethyl-3-methylimidazolium hydrogen sulfate + sorbitol + water) mixtures. For this purpose, via the measured density data, apparent molar volumes, their values at infinite dilution and apparent molar expansibility for these ionic liquids (ILs) in aqueous sorbitol solutions have been calculated. By means of these information, as where as possible, solute =solvent and solute-solute interactions in these systems are discussed. Hydrophilic–hydrophobic hydrophobic–ionic and hydrophobic–hydrophobic interactions are governing in the considered ternary solutions. Both ionic liquids act as structure maker in these solutions.