Self-assembly of sodium and potassium betulinates into hydro- and organo-gels: entrapment and removal studies of fluorophores and synthesis of gel–gold nanoparticle hybrid materials

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17290-17296 ◽  
Author(s):  
Braja Gopal Bag ◽  
Shib Shankar Dash
Keyword(s):  
Gold Nanoparticle ◽  
Hybrid Materials ◽  
Betulinic Acid ◽  
Self Assembly ◽  
Solvent Mixtures ◽  
Potassium Salts ◽  
Aqueous Solvent Mixtures ◽  
Aqueous Solvent ◽  
Removal Studies ◽  
Sodium And Potassium

Sodium and potassium salts of a renewable nano-sized triterpenoid betulinic acid have been prepared and their self-assembly properties in water and aqueous solvent mixtures have been studied.

Self-assembly study of ammonium oleanolate and generation of gel– gold nanoparticle hybrid material

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Braja Gopal Bag ◽  
Subhajit Das
Keyword(s):  
Hybrid Material ◽  
Self Assembly ◽  
Room Temperature ◽  
Aqueous Ammonia ◽  
The Self ◽  
Solvent Mixtures ◽  
Optical Birefringence ◽  
Aqueous Solvent Mixtures ◽  
Aqueous Solvent ◽  
The Stability

A solution of oleanolic acid, a renewable nano-sized monohydroxy triterpenic acid in tetrahydrofuran, transformed into a gel instantly at room temperature on treatment with aqueous ammonia. Study of the self-assembly properties of ammonium oleanolate in water and aqueous solvent mixtures indicated that it self-assembles in the aqueous solvent mixtures forming gels in DMSO-water and DMF-water. Fibrillar networks with optical birefringence properties were observed by polarized optical microscopy. Scanning electron microscopy of the dried gel samples indicated fibrillar networks with fibers of nano to micrometer diameters. The thermodynamic parameters calculated from the gel to sol transition temperatures indicated the stability of the gels. A gel-gold nanoparticles hybrid material has also been prepared and characterized by HRTEM, EDX, SAED and surface Plasmon resonance studies.

A direct carbon-13 and nitrogen-15 NMR study of samarium(III) complexation with nitrate and isothiocyanate in aqueous solvent mixtures

1994 ◽  
Vol 23 (9) ◽  
pp. 1019-1047 ◽  
Author(s):  
A. Fratiello ◽  
V. Kubo-Anderson ◽  
E. Bolanos ◽  
O. Chavez ◽  
F. Laghaei ◽  
...  
Keyword(s):  
Solvent Mixtures ◽  
Aqueous Solvent Mixtures ◽  
Nmr Study ◽  
Aqueous Solvent

Substitution of azide atNNN?N?-tetraethyldiethylenetriaminechlorogold-(III) in binary aqueous solvent mixtures

1979 ◽  
Vol 4 (3) ◽  
pp. 161-163 ◽  
Author(s):  
Michael J. Blandamer ◽  
John Burgess ◽  
Stephen J. Hamshere ◽  
Paul Wellings
Keyword(s):  
Solvent Mixtures ◽  
Aqueous Solvent Mixtures ◽  
Aqueous Solvent

Luminescence study on the solvation of Cm(III) in binary aqueous solvent mixtures

2011 ◽  
Vol 99 (12) ◽  
pp. 783-790 ◽  
Author(s):  
S. Trumm ◽  
G. Lieser ◽  
Petra J. Panak
Keyword(s):  
Solvent Mixtures ◽  
Aqueous Solvent Mixtures ◽  
Luminescence Study ◽  
Aqueous Solvent

Hexachloroiridate(IV) oxidation of benzenediols in binary aqueous solvent mixtures: Solvation and reactivity

1990 ◽  
Vol 173 (1) ◽  
pp. 43-51 ◽  
Author(s):  
C. Minero ◽  
E. Pramauro ◽  
E. Pelizzetti ◽  
N.J. Blundell ◽  
J. Burgess ◽  
...  
Keyword(s):  
Solvent Mixtures ◽  
Aqueous Solvent Mixtures ◽  
Aqueous Solvent

scholarly journals Tunable Supramolecular Chirogenesis in the Self-Assembling of Amphiphilic Porphyrin Triggered by Chiral Amines

2020 ◽  
Vol 21 (22) ◽  
pp. 8557
Author(s):  
Marco Savioli ◽  
Manuela Stefanelli ◽  
Gabriele Magna ◽  
Francesca Zurlo ◽  
Maria Federica Caso ◽  
...  
Keyword(s):  
Self Assembly ◽  
Hydrophobic Effect ◽  
The Self ◽  
Chiral Amines ◽  
Solvent Mixtures ◽  
Fractal Structures ◽  
Chiral Amine ◽  
Supramolecular Chirality ◽  
Self Assembling ◽  
Aqueous Solvent

Supramolecular chirality is one of the most important issues in different branches of science and technology, as stereoselective molecular recognition, catalysis, and sensors. In this paper, we report on the self-assembly of amphiphilic porphyrin derivatives possessing a chiral information on the periphery of the macrocycle (i.e., D- or L-proline moieties), in the presence of chiral amines as co-solute, such as chiral benzylamine derivatives. The aggregation process, steered by hydrophobic effect, has been studied in aqueous solvent mixtures by combined spectroscopic and topographic techniques. The results obtained pointed out a dramatic effect of these ligands on the morphology and on the supramolecular chirality of the final self-assembled structures. Scanning electron microscopy topography, as well as fluorescence microscopy studies revealed the formation of rod-like structures of micrometric size, different from the fractal structures formerly observed when the self-assembly process is carried out in the absence of chiral amine co-solutes. On the other hand, comparative experiments with an achiral porphyrin analogue strongly suggested that the presence of the prolinate moiety is mandatory for the achievement of the observed highly organized suprastructures. The results obtained would be of importance for unraveling the intimate mechanisms operating in the selection of the homochirality, and for the preparation of sensitive materials for the detection of chiral analytes, with tunable stereoselectivity and morphology.

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