نتایج جستجو برای: physical solvents

تعداد نتایج: 707371  

Journal: :Archivos de la Sociedad Espanola de Oftalmologia 2012
M Martínez Rubio M Moya Moya J Selva Otaola-Urruchi T Martínez Lazcano J Belmonte Martínez

OBJECTIVE The purification of commercially prepared triamcinolone acetonide is important in order to avoid the potential toxic side-effects of the solvent benzyl alcohol. We present a new technique for preparation of pure triamcinolone acetonide by dissolving the powder in sterile distilled water with no additional solvents. As the triamcinolone powder is relatively insoluble in water, we descr...

Journal: :Chemical communications 2002
Douglas F Foster Dave J Adams David Gudmunsen Alison M Stuart Eric G Hope David J Cole-Hamilton

Triaryl-phosphines and -phosphites bearing fluorous ponytails give high rates, good linear selectivity and good retention of catalyst in the fluorous phase during hydroformylation of alkenes in fluorous solvents.

2014
Roksana Markiewicz Stefan Jurga

Nanostructures due to their small size, in comparison with their bulk counterparts, possess unique properties including magnetic, electrochemical and photonic properties. Therefore, such nanomaterials found a wide variety of application in different fields such as catalysis, electronic and spintronics, life and material sciences. Controlling the morphology and structure of nanomaterials is of c...

2012
Menghua Wu Walter Navarrini Gianfranco Spataro Francesco Venturini

The α,ω-dialkoxyfluoropolyethers (DA-FPEs) characterized by the structure RHO(CF2CF2O)n(CF2O)mRH have been developed as a new class of environmentally friendly hydrofluoroethers (HFEs) suitable as solvents, long-term refrigerants, cleaning fluids, and heat transfer fluids. Synthetic methodologies for DA-FPEs described here consist of radical-initiated oxypolymerization of olefin, peroxy-elimina...

2012
Noah T. Jafferis James C. Sturm

We report the formation of smooth and processable silicon thin-films from single-crystal silicon-nanoparticle suspensions. Single-crystal Si-nanoparticles (1–4 nm) are produced and suspended in various solvents. Films deposited from the suspension are mechanically stable and can be patterned and processed upon deposition. Physical compression of the films is presented as a mechanism to reduce p...

Journal: :Journal of Chemical Information and Computer Sciences 1999
Alan R. Katritzky Tarmo Tamm Yilin Wang Sulev Sild Mati Karelson

The results of the quantitative structure-property relationship (QSPR) analysis of 45 different solvent scales and 350 solvents using the CODESSA program are presented. The QSPR models for each of the scales are constructed using only theoretical descriptors. The high quality of the models (32 of the 45 give R2 > 0.90, only two have R2 < 0.82) enables direct calculation of predicted values for ...

Journal: :Physical chemistry chemical physics : PCCP 2014
P N Bartlett D A Cook M W George A L Hector J Ke W Levason G Reid D C Smith W Zhang

Recent studies have shown that it is possible to electrodeposit a range of materials, such as Cu, Ag and Ge, from various supercritical fluids, including hydrofluorocarbons and mixtures of CO2 with suitable co-solvents. In this perspective we discuss the relatively new field of electrodeposition from supercritical fluids. The perspective focuses on some of the underlying physical chemistry and ...

2008
M A Jivulescu

Quadratic matrix equations occur in a variety of applications. In this paper we introduce new permutationally invariant functions of two solvents of the n × n quadratic matrix equation X − L1X − L0 = 0, playing the role of the two elementary symmetric functions of the two roots of a quadratic scalar equation. Our results rely on the connection existing between the QME and the theory of linear s...

Journal: :Lancet 1997
R F White S P Proctor

We describe the clinical evaluation of the nervous-system effects of solvent exposure. We review the current evidence in the epidemiological literature on neurotoxicological effects of solvents, and outline methods and issues to be taken into account in assessment of the patient whose symptoms may be related to solvent toxicity. Primary prevention of these disorders is essential, because treatm...

Journal: :Chemical communications 2015
Tongnian Gu Mingliang Zhang Jia Chen Hongdeng Qiu

Deep eutectic solvents (DESs), as a novel class of green solvents, were successfully applied as eco-friendly and sustainable reaction media for fast surface modification of spherical porous silica, resulting in stationary phases for high-performance liquid chromatography. The new reaction media were advantageous over organic solvents in many aspects, such as the high dispersibility of silica sp...

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