Phase Transfer of Aqueous CdS Nanoparticles by Coordination with Octadecanethiol Molecules Present in Nonpolar Organic Solvents

Langmuir ◽  
2000 ◽  
Vol 16 (24) ◽  
pp. 9299-9302 ◽  
Author(s):  
Ashavani Kumar ◽  
A. B. Mandale ◽  
Murali Sastry
Keyword(s):  
Organic Solvents ◽  
Phase Transfer ◽  
Cds Nanoparticles ◽  
Nonpolar Organic

Efficient Phase Transfer of Luminescent Thiol-Capped Nanocrystals:  From Water to Nonpolar Organic Solvents

Nano Letters ◽  
2002 ◽  
Vol 2 (8) ◽  
pp. 803-806 ◽  
Author(s):  
Nikolai Gaponik ◽  
Dmitri V. Talapin ◽  
Andrey L. Rogach ◽  
Alexander Eychmüller ◽  
Horst Weller
Keyword(s):  
Organic Solvents ◽  
Phase Transfer ◽  
Nonpolar Organic

scholarly journals The Role of Solvent Environment on the Optical Behavior of Chemically Synthesized Silicon Nanoparticles

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Rawabi M. Al Mohaimeed ◽  
Anees A. Ansari ◽  
Abdullah Aldwayyan
Keyword(s):  
Organic Solvents ◽  
Silicon Nanoparticles ◽  
Wafer Surface ◽  
Absorption Properties ◽  
Nonpolar Solvents ◽  
Luminescence Efficiency ◽  
Cross Section Area ◽  
Solvent Environment ◽  
Uv Lamp ◽  
Nonpolar Organic

Silicon nanoparticles (Si-NPs) were prepared by solution-based chemical etching method. Optical characteristics of the as-prepared Si-NPs were investigated in different polar and nonpolar organic solvents. The emission and absorption properties of Si-NPs were tuned by altering the environment (solvents). The variation in absorption coefficient was observed because of the solvent interaction nature of Si-NPs. Si-NPs in polar aprotic and nonpolar solvents manifested good luminescence under UV excitation. PL intensities were observed to be depending on etched cross-section area on wafer surface. The results show a linear dependence of the refractive index (n) on wavelength (λ). The nature of solvents altered the luminescence efficiency of Si-NPs when examining under UV lamp. The emission and absorption properties of Si-NPs were tuned by altering the environment (solvents) through electrostatic interaction of various organic solvents with the Si-NPs. The band shapes of the Si-NPs show remarkable changes in passing from noncoordinating solvent (chloroform) to various coordinating solvents, which was the result of change in the environment around Si-NPs in various solutions.

The wormlike micelles formed using an ionic liquid surfactant and polar organic solvents at low temperature without additives and their lubricant properties

Soft Matter ◽  
2021 ◽  
Author(s):  
Huijiao Cao ◽  
Wenlin Xu ◽  
Xia Guo
Keyword(s):  
Ionic Liquid ◽  
Low Temperature ◽  
Organic Solvent ◽  
Organic Solvents ◽  
Wormlike Micelles ◽  
Polar Organic Solvents ◽  
Ionic Liquid Surfactant ◽  
Nonpolar Organic

Wormlike micelles (or reverse wormlike micelles) are flexible cylindrical chains that are normally formed in water (or a nonpolar organic solvent) at 25.0 °C or above; the formation of wormlike micelles at lower temperatures is rare.

Racemization of (S)-Profen Thioesters by Strong Neutral Bases in Nonpolar Organic Solvents:  Implication for Ion-Pair Kinetic Basicity

2002 ◽  
Vol 67 (10) ◽  
pp. 3323-3326 ◽  
Author(s):  
Chia-Yin Chen ◽  
Yu-Shang Chang ◽  
Shun-An Lin ◽  
Hui-I Wen ◽  
Yu-Chi Cheng ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Ion Pair ◽  
Nonpolar Organic

Über Metalltrifluorphosphin-Komplexe. XXXVII. / On Metaltrifluorophosphine Complexes. XXXVII.

1973 ◽  
Vol 28 (1-2) ◽  
pp. 28-33 ◽  
Author(s):  
Thomas Kruck ◽  
Gerd Sylvester ◽  
Inge-Petra Kunau
Keyword(s):  
Ir Spectra ◽  
Organic Solvents ◽  
Conjugated Dienes ◽  
Thermally Stable ◽  
H Nmr ◽  
Nonpolar Organic ◽  
Nmr Signals

π-Allyltris(trifluorophosphine)cobaltcomplexes, CnH2n-1Co(PF3)3, are synthetized by the reaction of hydrido-tetrakis(trifluorophosphine)cobalt with conjugated dienes. Suitable dienes are butadiene, isoprene, chloroprene, cis-1.3-pentadiene, trans-trans-2.4-hexadiene, 2.3-dimethyl-1.3-butadiene, 2.4-dimethyl-1.3-pentadiene and 1.3-cyclohexadiene. The complexes are thermally stable up to 100°C. They can be sublimed at 25°C/10-3 Torr. They are extremely soluble in polar as well as in nonpolar organic solvents. Since the 1H-NMR-signals are only poorly resolved, it is not possible to distinguish between expected isomers. The IR-spectra are consistent with a tetrahedral arrangement of the ligands.

The synthesis of esters under microwave irradiation using dry-media conditions

1993 ◽  
Vol 71 (1) ◽  
pp. 90-95 ◽  
Author(s):  
André Loupy ◽  
Alain Petit ◽  
Mohamed Ramdani ◽  
Celine Yvanaeff ◽  
Mustapha Majdoub ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Organic Solvents ◽  
Phase Transfer Catalysis ◽  
High Pressures ◽  
Phase Transfer ◽  
Polar Molecules ◽  
Ionic Reactions ◽  
Microwave Effects

Practical and simple techniques are described for using nonmodified domestic microwave ovens as safe and convenient laboratory devices to obtain numerous esters. High pressures are avoided by conducting reactions with reactants impregnated on solid mineral supports in "dry media" or by phase transfer catalysis (PTC) in the absence of organic solvents. Two kinds of microwave effects are involved: (1) displacement of the equilibrium by evaporation of volatile polar molecules (water or alcohols) in esterifications and transesterifications; (2) acceleration of ionic reactions in carboxylate alkylations. As solvents are avoided, there is no need for sealed vessels and water separators.

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