Responsive drop method: quantitative in situ determination of surfactant effectiveness using reconfigurable Janus emulsions

Saveh Djalali; Bradley D. Frank; Lukas Zeininger

doi:10.1039/d0sm01724h

Responsive drop method: quantitative in situ determination of surfactant effectiveness using reconfigurable Janus emulsions

Soft Matter ◽

10.1039/d0sm01724h ◽

2020 ◽

Vol 16 (46) ◽

pp. 10419-10424

Author(s):

Saveh Djalali ◽

Bradley D. Frank ◽

Lukas Zeininger

Keyword(s):

Interfacial Tension ◽

Stimuli Responsive ◽

Critical Micelle Concentrations ◽

Drop Method

A time- and sample-saving ‘responsive drop method’ for the in situ quantification of interfacial tension and the determination of critical micelle concentrations of classical and stimuli-responsive surfactants is reported.

Download Full-text

INDIREKTE PAPIERCHROMATOGRAPHISCHE METHODE ZUR BESTIMMUNG DER HARNOESTROGENE

Acta Endocrinologica ◽

10.1530/acta.0.0380545 ◽

1961 ◽

Vol 38 (4) ◽

pp. 545-562 ◽

Cited By ~ 2

Author(s):

L. Kecskés ◽

F. Mutschler ◽

I. Glós ◽

E. Thán ◽

I. Farkas ◽

...

Keyword(s):

Pregnant Women ◽

Granulosa Cell ◽

Iron Content ◽

List Type ◽

Granulosa Cell Tumour ◽

Hydrolysis Of ◽

Phenol Fraction ◽

Qualitative Determination

ABSTRACT 1. An indirect paperchromatographic method is described for separating urinary oestrogens; this consists of the following steps: acidic hydrolysis, extraction with ether, dissociation of phenol-fractions with partition between the solvents. Previous purification of phenol fraction with the aid of paperchromatography. The elution of oestrogen containing fractions is followed by acetylation. Oestrogen acetate is isolated by re-chromatography. The chromatogram was developed after hydrolysis of the oestrogens 'in situ' on the paper. The quantity of oestrogens was determined indirectly, by means of an iron-reaction, after the elution of the iron content of the oestrogen spot, which was developed by the Jellinek-reaction. 2. The method described above is satisfactory for determining urinary oestrogen, 17β-oestradiol and oestriol, but could include 16-epioestriol and other oestrogenic metabolites. 3. The sensitivity of the method is 1.3–1.6 μg/24 hours. 4. The quantitative and qualitative determination of urinary oestrogens with the above mentioned method was performed in 50 pregnant and 9 non pregnant women, and also in 2 patients with granulosa cell tumour.

Download Full-text

In situ determination of toughness indices of fibre reinforced concrete

Materials and Structures ◽

10.1617/14157 ◽

2005 ◽

Author(s):

P. Antonaci

Keyword(s):

Reinforced Concrete ◽

Fibre Reinforced Concrete

Download Full-text

In Situ Determination of the Increase in Saturation Solubility of Nanocrystals of Poorly Soluble Drugs

10.26226/morressier.57d6b2bdd462b8028d88d9ab ◽

2016 ◽

Author(s):

Roland Bodmeier

Keyword(s):

Poorly Soluble Drugs ◽

Saturation Solubility ◽

Poorly Soluble

Download Full-text

Single Crystal Growth of High-Pressure Phases of Ice and Salt Hydrate Far Below the Original Melting Point by Mixing Alcohol: Crystal Structure Determination of Magnesium Chloride Heptahydrate

10.26434/chemrxiv.11345063.v2 ◽

2020 ◽

Author(s):

Keishiro Yamashita ◽

Kazuki Komatsu ◽

Hiroyuki Kagi

Keyword(s):

Crystal Structure ◽

High Pressure ◽

Crystal Growth ◽

Single Crystal ◽

Room Temperature ◽

Growth Technique ◽

Salt Hydrate ◽

X Ray

An crystal-growth technique for single crystal x-ray structure analysis of high-pressure forms of hydrogen-bonded crystals is proposed. We used alcohol mixture (methanol: ethanol = 4:1 in volumetric ratio), which is a widely used pressure transmitting medium, inhibiting the nucleation and growth of unwanted crystals. In this paper, two kinds of single crystals which have not been obtained using a conventional experimental technique were obtained using this technique: ice VI at 1.99 GPa and MgCl<sub>2</sub>·7H<sub>2</sub>O at 2.50 GPa at room temperature. Here we first report the crystal structure of MgCl2·7H2O. This technique simultaneously meets the requirement of hydrostaticity for high-pressure experiments and has feasibility for further in-situ measurements.

Download Full-text