ISO 9101:1987 PDF

Surface active agents — Determination of interfacial tension — Drop volume method

Название (английский):

ISO 9101:1987

Surface active agents — Determination of interfacial tension — Drop volume method

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 13
Дата публикации:: 26 ноября 1987 г.
Издание:: ISO IS 9101 edition 1 version 1
ICS:: 71.100.40

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Описание (английский):

The volume of a drop of an aqueous phase formed at the end of a vertical capillary tube is measured when it detaches from the tube in contact with the organic phase. The interfacial tension between two liquid phases is obtained by balancing the weight of the drop with the interfacial tension force supporting it and applying a correction factor. Then the interfacial tension is calculated from the volume of the falling drop, the outer capillary radius, the density difference between the two liquid phases and the acceleration due to gravity.

Технические детали

Технический комитет: ISO/TC 91 - Surface active agents
SKU: ISO 9101:1987

Abstract

Overview

ISO 9101:1987 specifies the drop volume method for determining interfacial tension between two liquid phases, especially when one or both contain surface active agents (surfactants). The method measures the volume of a drop of the aqueous (or test) phase formed at the end of a vertical capillary and uses the drop volume, capillary radius, density difference and a correction factor to calculate interfacial tension. It is designed for laboratory control and research where repeatable, low-tension measurements are required.

Key topics and requirements

Measurement principle: Balance between drop weight and interfacial tension force; interfacial tension calculated from drop volume, capillary outer radius, density difference and a correction factor (Harkins & Brown-type tables).
Apparatus:
- Glass syringe (0.5 cm3) driven by a micrometer screw (or motor/stepper) for precise volume control.
- Glass or stainless-steel capillaries with well-prepared, plane tips; removable for cleaning.
- Jacketed thermoregulated vessel (control to ±0.5 °C).
- Vibration-free stand and travelling microscope for radius/volume checks.
Capillary selection & geometry:
- Typical outer radius range 0.1–0.4 cm; 0.2 cm commonly used for interfacial tensions ~1–30 mN/m.
- Recommended ratio r / V^(1/3) most accurate in 0.65–0.95; acceptable wider range 0.3–1.2 (tables/figures provided).
Cleaning & contamination control:
- Rigorous cleaning (acid/peroxide treatments, organic solvents) and rinsing with freshly prepared double-distilled water (see ISO 2456).
- Tests performed under a bell to avoid airborne contamination.
Accuracy & precision:
- Repeatability standard deviation typically

Overview

Key topics and requirements

Measurement principle: Balance between drop weight and interfacial tension force; interfacial tension calculated from drop volume, capillary outer radius, density difference and a correction factor (Harkins & Brown-type tables).
Apparatus:
- Glass syringe (0.5 cm3) driven by a micrometer screw (or motor/stepper) for precise volume control.
- Glass or stainless-steel capillaries with well-prepared, plane tips; removable for cleaning.
- Jacketed thermoregulated vessel (control to ±0.5 °C).
- Vibration-free stand and travelling microscope for radius/volume checks.
Capillary selection & geometry:
- Typical outer radius range 0.1–0.4 cm; 0.2 cm commonly used for interfacial tensions ~1–30 mN/m.
- Recommended ratio r / V^(1/3) most accurate in 0.65–0.95; acceptable wider range 0.3–1.2 (tables/figures provided).
Cleaning & contamination control:
- Rigorous cleaning (acid/peroxide treatments, organic solvents) and rinsing with freshly prepared double-distilled water (see ISO 2456).
- Tests performed under a bell to avoid airborne contamination.
Accuracy & precision:
- Repeatability standard deviation typically

ISO 9101:1987 PDF

Технические детали

Abstract

Overview

Key topics and requirements

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Abstract

Overview

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