Results 71 to 80 of about 220,193 (199)

Picosecond Transient Grating Study of The Reorientation Dynamics of Nile Red in different classes of solvents

open access: yes, 1993
The rotational dynamics of nile red has been studied in polar protic, polar aprotic and non-polar solvents. In the non-polar and the aprotic solvents, with the exception of long alkanenitriles, the rotation dynamics is consistent with the prediction of ...
Vauthey, Eric, Eic Vauthey
core   +1 more source

The State of the Art on PVDF Membrane Preparation for Membrane Distillation and Membrane Crystallization: Towards the Use of Non-Toxic Solvents

open access: yesMembranes
Most parts of the earth are covered with water, but only 0.3% of it is available to living beings. Industrial growth, fast urbanization, and poor water management have badly affected the water quality. In recent years, a transition has been seen from the
Aqsa Mansoor Khan   +5 more
doaj   +1 more source

The electronic origin of the ground state spectral features and excited state deactivation in cycloalkanones: the role of intermolecular H-bonding in neat and binary mixtures of solvents [PDF]

open access: yes, 2019
In this study, a D-A cycloalkanone (K1) has been investigated by steady state absorption and fluorescence in neat solvents and in three binary mixtures of nonpolar aprotic/polar protic, polar aprotic/polar protic, and polar protic/polar protic solvents ...
Al-Ansari I.A.Z.
core   +1 more source

Regenerated silk fibroin using protic ionic liquids solvents : towards an all-ionic-liquid process for producing silk with tunable properties

open access: yes, 2012
We have shown that protic ionic liquids, pILs, are effective coagulation solvents for the regenerated of silk fibroin, RSF. We show that the choice of pIL has a dramatic effect on the composition of the RSF. Additionally the use of pILs as the coagulator
Nolene Byrne (13086960)   +3 more
core  

Broadband fluorescence reveals mechanistic differences in excited-state proton transfer to protic and aprotic solvents

open access: yes, 2020
Excited-state proton transfer (ESPT) to solvent is often explained according to the two-step Eigen-Weller model including a contact ion pair (CIP*) as an intermediate, but general applicability of the model has not been thoroughly examined.
Vauthey, Eric   +4 more
core   +1 more source

Silver-Mediated Allylic Disulfide Rearrangement for Conjugation of Thiols in Protic Media

open access: yes, 2009
International audienceAlkyl and aryl allyl disulfides are induced to undergo the desulfurative allylic rearrangement by silver nitrate in protic solvents at room temperature, thereby removing the necessity for the use of phosphines as thiophilic reagents.
Venkataraman Subramanian   +5 more
core   +1 more source

Cellulose swelling by aprotic and protic solvents: What are the similarities and differences?

open access: yes, 2008
The swelling of microcrystalline, native and mercerized cotton and eucalyptus celluloses by 16 aprotic solvents was investigated. The number of moles of solvent/anhydroglucose unit, nSw, correlates well with solvent molar volume, basicity and dipolarity ...
FIDALE, Ludmila C.   +3 more
core   +1 more source

IONIC LIQUIDS: PREPARATIONS AND LIMITATIONS

open access: yesMakara Seri Sains, 2010
Ionic liquids are considered as an ideal alternative to volatile organic solvents and chemical industries in the future,because they are non-volatile.
Dzulkefly Kuang Abdullah   +1 more
doaj  

PGSE and NOE NMR evidence for higher order aggregation in some cationic ruthenium complexes in both protic and aprotic solvents

open access: yes, 2003
PGSE and NOE NMR measurements were carried out for complexes [Ru(eta(6)-cymene)((2-R-C6H4)N=C(Me)-C(Me)=N(2-R-C6H4))Cl]X (X=BF4 or BPh4) in both protic and aprotic solvents with a relative permettivity (epsilon(r)) ranging from 2.27 (benzene-d(6)) to 46 ...
Sabatini, Stefano   +10 more
core   +1 more source

Fluorescence and photostability studies of anthracene-9-carboxylic acid in different media

open access: yesInternational Journal of Photoenergy, 2000
Electronic absorption and fluorescence spectra of anthracene-9-carboxylic acid (ANCA) were studied in different homogeneous solvents, binary protic/aprotic solvent mixtures and in heterogeneous solutions of the cationic cetyltrimethyl ammonium bromide ...
M. S. A. Abdel-Mottaleb   +6 more
doaj   +1 more source

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