This work has mainly investigated the influence of the solvent on the nanoparticles distribution in digestive ripening. The experiments suggested that the solvents played a key role in digestive ripening of Au nanoparticles (Au NPs). For the benzol solvents, the resulting size distribution of Au NPs was inversely related to the solvent polarity. It may be interpreted by the low Gibbs free energ...

A reliable and simple procedure to extract polychlorinated biphenyls (PCBs) from marine mussels using microwave energy is proposed. Freeze-dried mussels were subjected to MASE (Microwave Assisted Solvent Extraction) in a closed-vessel microwave system with n-pentane-sodium hydroxide (5 %) or dichloromethane-pentane (1:1) at different temperatures (70 and 90 oC), the extraction time was 10 minut...

A quantitative study of the variation of the conformational equilibria of 7-benzyl-2-iodo-9-oxa-7-azabicyclo[4.3.0]nonan-8-one 1 in 10 solvents has been carried out. The experimental composition in each solvent has been obtained from experimental NMR vicinal H-H coupling constants together with molecular modeling. The solvent properties, particularly polarity and hydrogen bonding ability, were ...

Electron transfer reactions between thiopyronine triplet (acceptor 3A+) and the electron donors (D), aniline, p-Br-aniline and p-I-aniline, are investigated by flash spectroscopy in solvents of different viscosity and polarity. Due to the heavy-atom effect the radical yield becomes very ~ensitive to the solvent influence, which can be explained by the dynamic properties of a triplet exciplex (3...

The kinetics and mechanism of the photodeprotection and rearrangement reactions for the pHP phototrigger compounds p-hydroxyphenacyl diethyl phosphate (HPDP) and diphenyl phosphate (HPPP) were studied using transient absorption (TA) and picosecond time-resolved resonance Raman (ps-TR(3)) spectroscopy. TA spectroscopy was employed to detect the dynamics of the triplet precursor decay as well as ...

Quasichemical theory (QCT) provides a framework that can be used to partition the influence of the solvent surrounding an ion into near and distant contributions. Within QCT, the solvation properties of the ion are expressed as a sum of configurational integrals comprising only the ion and a small number of solvent molecules. QCT adopts a particularly simple form if it is assumed that the clust...

The objective of this research is to design an approach for selecting appropriate raw materials for facial tissues in Iran. There are three possibilities to maintain raw materials: (1) imported virgin pulp; (2) bagasse (sugar cane residue) plus some imported raw materials; and (3) recycled paper plus some imported raw materials. Owing to the shortage of raw materials as well as the high rate of...

As an important long-term incentive mode, the equity incentive promotes the managers to contribute to the interest uniformity of managers and shareholders. By using Paired-Samples T test methods and regression analysis method and choosing companies that issued the equity incentive plan in 2007 as the sample, this paper comparatively analyzes the differences in the performance of companies befor...

We show that the quantum coherent transfer of excitations between biomolecular chromophores is strongly influenced by spatial correlations of environmental fluctuations. The latter are due either to propagating environmental modes or to local fluctuations with a finite localization length. A simple toy model of a single donor–acceptor pair with spatially separated chromophore sites allows one t...