scholarly journals Recent Advances in Gemini Surfactants: Oleic Acid-Based Gemini Surfactants and Polymerizable Gemini Surfactants

2011 ◽  
Vol 60 (4) ◽  
pp. 159-163 ◽  
Author(s):  
Kenichi Sakai ◽  
Hideki Sakai ◽  
Masahiko Abe
Keyword(s):  
Oleic Acid ◽  
Gemini Surfactants ◽  
Recent Advances

Recent Advances in the Synthesis of Sulfonate Gemini Surfactants

2018 ◽  
Vol 21 (4) ◽  
pp. 443-453 ◽  
Author(s):  
Ming Zhou ◽  
Yiping Chen ◽  
Jiaxi Zou ◽  
Juncheng Bu
Keyword(s):  
Gemini Surfactants ◽  
Recent Advances

Effect of inorganic and organic counterions on interfacial properties of oleic acid-based gemini surfactants

2018 ◽  
Vol 538 ◽  
pp. 73-78 ◽  
Author(s):  
Tadashi Sugahara ◽  
Yuichiro Takamatsu ◽  
Masaaki Akamatsu ◽  
Kenichi Sakai ◽  
Masahiko Abe ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Gemini Surfactants ◽  
Interfacial Properties ◽  
Inorganic And Organic

scholarly journals Physicochemical Properties of Oleic Acid-Based Partially Fluorinated Gemini Surfactants

2014 ◽  
Vol 63 (3) ◽  
pp. 257-267 ◽  
Author(s):  
Kenichi Sakai ◽  
Naoki Umemoto ◽  
Kenichi Aburai ◽  
Yuichiro Takamatsu ◽  
Takeshi Endo ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Physicochemical Properties ◽  
Gemini Surfactants

scholarly journals Quaternary Ammonium-Type Gemini Surfactants Synthesized from Oleic Acid: Aqueous Solution Properties and Adsorption Characteristics

2013 ◽  
Vol 62 (7) ◽  
pp. 489-498 ◽  
Author(s):  
Kenichi Sakai ◽  
Yuki Saito ◽  
Akihito Uka ◽  
Wataru Matsuda ◽  
Yuichiro Takamatsu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Oleic Acid ◽  
Quaternary Ammonium ◽  
Gemini Surfactants ◽  
Solution Properties ◽  
Adsorption Characteristics ◽  
Acid Aqueous Solution

scholarly journals Oleic Acid-Based Gemini Surfactants

Oleoscience ◽  
2011 ◽  
Vol 11 (9) ◽  
pp. 327-332
Author(s):  
Kenichi SAKAI ◽  
Yuichiro TAKAMATSU ◽  
Hideki SAKAI ◽  
Masahiko ABE
Keyword(s):  
Oleic Acid ◽  
Gemini Surfactants

scholarly journals Oleic Acid-Based Gemini Surfactants with Carboxylic Acid Headgroups

2011 ◽  
Vol 60 (8) ◽  
pp. 411-417 ◽  
Author(s):  
Kenichi Sakai ◽  
Naoki Umemoto ◽  
Wataru Matsuda ◽  
Yuichiro Takamatsu ◽  
Mutsuyoshi Matsumoto ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Carboxylic Acid ◽  
Gemini Surfactants

Characterization of the micelle structure of oleic acid-based gemini surfactants: effect of stereochemistry

2018 ◽  
Vol 20 (13) ◽  
pp. 8874-8880 ◽  
Author(s):  
Tadashi Sugahara ◽  
Yuichiro Takamatsu ◽  
Avinash Bhadani ◽  
Masaaki Akamatsu ◽  
Kenichi Sakai ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Micelle Structure ◽  
Self Aggregation

In this study, we synthesize a novel oleic acid-based gemini surfactant with carboxylate headgroups, and study the effect of stereochemistry (anti- vs. syn-) on self-aggregation properties in water.

Recent Advances in High Dispersion Spectroscopy of Globular Cluster Stars

1988 ◽  
Vol 132 ◽  
pp. 525-530
Author(s):  
Raffaele G. Gratton
Keyword(s):  
Globular Cluster ◽  
Globular Clusters ◽  
High Dispersion ◽  
Photographic Material ◽  
Recent Advances ◽  
Metal Abundances ◽  
Ccd Detectors ◽  
Major Progress

The use CCD detectors has allowed a major progress in abundance derivations for globular cluster stars in the last years. Abundances deduced from high dispersion spectra now correlates well with other abundance indicators. I discuss some problems concerning the derivation of accurate metal abundances for globular clusters using high dispersion spectra from both the old photographic and the most recent CCD data. The discrepant low abundances found by Cohen (1980), from photographic material for M71 giants, are found to be due to the use of too high microturbulences.

A magnetic super lattice

1987 ◽  
Vol 45 ◽  
pp. 360-361 ◽  
Author(s):  
M.D. Bentzon ◽  
J. v. Wonterghem ◽  
A. Thölén
Keyword(s):  
Thermal Decomposition ◽  
Oleic Acid ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Carbon Film ◽  
Thick Layer ◽  
Amorphous Iron ◽  
Super Lattice ◽  
Carrier Liquid ◽  
Median Diameter

We report on the oxidation of a magnetic fluid. The oxidation results in magnetic super lattice crystals. The “atoms” are hematite (α-Fe2O3) particles with a diameter ø = 6.9 nm and they are covered with a 1-2 nm thick layer of surfactant molecules.Magnetic fluids are homogeneous suspensions of small magnetic particles in a carrier liquid. To prevent agglomeration, the particles are coated with surfactant molecules. The magnetic fluid studied in this work was produced by thermal decomposition of Fe(CO)5 in Declin (carrier liquid) in the presence of oleic acid (surfactant). The magnetic particles consist of an amorphous iron-carbon alloy. For TEM investigation a droplet of the fluid was added to benzine and a carbon film on a copper net was immersed. When exposed to air the sample starts burning. The oxidation and electron irradiation transform the magnetic particles into hematite (α-Fe2O3) particles with a median diameter ø = 6.9 nm.

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