Thermodynamic properties of some N-alkyl-N-methylpiperidinium chlorides and N-alkylpiperidine hydrochlorides in water

Effect of temperature on the volume and compressibilities of some amphiphilic penicillins in aqueous solution

“…The DV m f values for each compound determined in this way were positive (see Table 2). A similar observation has been reported for classical surfactants 22,32,[38][39][40][41][42][43] and other drugs. 18,25,44 It is generally assumed that this increase in molal volume is mainly due to the release of structured water in the hydration shell of the monomers when the micelles are formed, allowing greater freedom of monomers within the aggregates and consequently a higher volume per monomer within the aggregate compared to that in solution.…”

Aggregation Behavior of Long-Chain Piperidinium Ionic Liquids in Ethylammonium Nitrate

“…The result suggests that there exist solvophobic interactions between the hydrocarbon chain and EAN, similar to the hydrophobic interactions in water. The obtained cmc values of C n PDB are higher than those in aqueous solution [32]. The cmc values of C n PDBs in EAN are smaller than those of C n mimBr (0.139, 0.0350 and 0.00913 mol·L −1 ) and C n MPB (0.097, 0.026 and 0.0078 mol·L −1 ) for the same alkyl chain length [45,46].…”

“…The Chen group studied the phase behavior of a series of piperidinium ILs using Polarized Optical Microscopy (POM), Small-Angle X-Ray Scattering (SAXS) and rheology measurements [31]. Milioto and his co-workers investigated the thermodynamic properties of a series of long-chain piperidinium salts in water [32]. Zhao et al , investigated the micelle behavior of piperidinium ILs N -alkyl- N -methylpiperidinium bromide C n PDB ( n = 12, 14, 16) through surface tension, electrical conductivity and steady-state fluorescence measurements [33].…”

Thermodynamics of Surfactants, Block Copolymers and Their Mixtures in Water: The Role of the Isothermal Calorimetry

“…In particular, it decreases for alkyltrimethylammonium bromides [22] (Figure 5) and it is nearly constant for sodium alkylsulfates [25]. It presents maxima in the case of alkyldimethylamine oxides [30] and alkylmethylpiperidinium chlorides [33] (Figure 5); similar results were observed by lengthening the second tail of the surfactant belonging to the N,N,N -alkyloctyldimethylammonium chloride series [24]. The hydrophilic head nature influences ΔH° m and generally the non-ionic surfactants exhibit positive and larger ΔH° m values than the ionic surfactants having the same tail size.…”

“…[ 22 ]), alkylmethylpiperidinium chlorides (▾, from Ref. [ 33 ]) and alkanediyl-α,ω-bis(alkyldimethylammonium bromides) (▴, from Ref. [ 1 ]) as a function of the number of carbon atoms in the surfactant alkyl chain at 298 K.…”