Testing of the constrained regularization method of inverting Laplace transform on simulated very wide quasielastic light scattering autocorrelation functions

Jakeš, J.

doi:10.1007/bf01597611

Cited by 235 publications

(184 citation statements)

References 7 publications

Supporting

Mentioning

181

Contrasting

Order By: Relevance

“…Samples were contained in scattering cells in a thermostat bath containing an index-matching liquid. The autocorrelation curves obtained were analysed by an inverse Laplace transformation to obtain the distribution of relaxation times using the algorithm REPES [58,59], as incorporated in the analysis package GENDIST. Details of data analysis have previously been given [58].…”

Section: Methodsmentioning

confidence: 99%

Solution behaviour of lead(II) carboxylates in organic solvents

Miguel

Pereira

Proença

et al. 2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

The solution behaviour has been studied of a series of even chain length lead(II) carboxylates (octanoate to octadecanoate) and the odd chain length lead(II) heptadecanoate in a variety of non-complexing organic solvents and in alcohols. In agreement with previous studies, solubility increases dramatically above a certain temperature, which depends on solute concentration, chain length and solvent. This solution temperature is also affected by traces of water. These results are complemented by studies using vapour pressure osmometry, dynamic light scattering, 1 H and 13 NMR spectroscopy. The results in water-free systems are consistent with the formation of rather ill-defined, polydisperse aggregates, which increase in size with concentration and decrease with temperature. These show similar local structure to lamellar mesophases in the pure lead(II) carboxylates, and are suggested to be formed by solvent induced swelling and break-up of these mesophases. In the presence of water, a more ordered structure is formed, in which a few water molecules are suggested to be bound to the lead(II) carboxylate headgroup.

show abstract

Section: Methodsmentioning

confidence: 99%

Solution behaviour of lead(II) carboxylates in organic solvents

Miguel

Pereira

Proença

et al. 2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

show abstract

“…The resultant correlation functions were analysed by REPES, 62 an analytical software that provides the distribution function of hydrodynamic radii (G(R h )). To account for the logarithmic scale on the R h axis, all DLS distribution diagrams are shown in the equal area representation R h G(R h ).…”

Section: Dynamic Light Scattering (Dls)mentioning

confidence: 99%

Novel thermosensitive telechelic PEGs with antioxidant activity: synthesis, molecular properties and conformational behaviour

et al. 2014

View full text Add to dashboard Cite

We report on the synthesis and solution properties of novel tailor -made polymer conjugates, which are highly compelling for biomedical applications due to their antioxidant activity and the potential to fine-tune their thermosensitive properties. These conjugates consist of polyethylene glycol (PEG polymers containing antioxidant moieties, namely 3 -(3,5-di-tertbutyl-4-hydroxyphenyl)propionate or 2-benzamido-3-(3,5-di-tert-butyl-4-hydroxyphenyl)acrylate, as end groups that differ in activity and hydrophobicity. It was shown that all of the synthesised conjugates have low critical solution temperatures (LCSTs) characteristic of type II polymers on a phase diagram. By simply varying the PEG molecular weight, the solution properties, including the LCST value, could be easily tuned across a broad temperature range of 20-90 ºC, providing an ideal method for the creation of thermosensitive polymers. It was also established that the LCST value and the polymer conjugate conformation depend on the antioxidant structure. From dynamic light scattering and small-angle X-ray scattering data, we were able to construct a complete sequence diagram of the conformational phase behaviour for the polymers with increasing temperature. It was observed that the conjugate conformation changes are the result of water shifting from a thermodynamically favourable solvent to an unfavourable one. This process then leads to compaction of the conjugate, followed by its aggregation.

show abstract

“…In this P(MAA-b-DEA) copolymer, one of the segments is a weak acid and the other a weak base (pKa 7.3 for DEA and pKa 5.4 for MAA). 13 The DEA block could be protonated at low pH making this segment hydrophilic, while the MAA block could be ionized and becomes soluble at high pH. Since either block has different pKa values and different chain lengths, the hydrophile-lipophile balance (HLB) of the block copolymer at high or low pH values are different.…”

Section: Methodsmentioning

confidence: 99%