ISO 7392:2024
(Main)Fine bubble technology — Evaluation method for determining surface tension of ultrafine bubble dispersions
Fine bubble technology — Evaluation method for determining surface tension of ultrafine bubble dispersions
This document specifies evaluation methods for surface tension of ultrafine bubble (UFB) dispersion in water. Three test methods, Wilhelmy, du Noüy and the pendant drop method, are adopted because of their advantages to detect small change in surface tension by UFB dispersion in water and the high accessibility to commercially available instruments. This document can be used to measure the surface tension of liquid containing UFB dispersion in dilute surfactant water solution such as detergent or machining coolant as well as UFB dispersion in water. NOTE Measurement data of liquid containing UFB dispersion in dilute surfactant water solution are summarized in Annex D.
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International
Standard
ISO 7392
First edition
Fine bubble technology —
2024-04
Evaluation method for determining
surface tension of ultrafine bubble
dispersions
Reference number
ISO 7392:2024(en) © ISO 2024
---------------------- Page: 1 ----------------------
ISO 7392:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2024 – All rights reserved
ii
---------------------- Page: 2 ----------------------
ISO 7392:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
4.1 General .2
4.2 Wilhelmy method .2
4.3 du Noüy method .2
4.4 Pendant drop method .2
5 Procedure . 2
5.1 Testing environment .2
5.2 Temperature measurement .2
5.3 Handling of the sample . .3
5.4 Cleaning of the measuring unit .3
5.4.1 Cleaning of the plate and ring .3
5.4.2 Cleaning of the measuring cup and syringe .3
5.5 Determination .3
5.6 Measurement of blank water .
...
International
Standard
ISO 7392
First edition
Fine bubble technology —
Evaluation method for determining
surface tension of ultrafine bubble
dispersions
PROOF/ÉPREUVE
Reference number
ISO 7392:2024(en) © ISO 2024
---------------------- Page: 1 ----------------------
ISO 7392:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
© ISO 2024 – All rights reserved
ii
---------------------- Page: 2 ----------------------
ISO 7392:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
4.1 General .2
4.2 Wilhelmy method .2
4.3 du Noüy method .2
4.4 Pendant drop method .2
5 Procedure . 2
5.1 Testing environment .2
5.2 Temperature measurement .2
5.3 Handling of the sample . .3
5.4 Cleaning of the measuring unit .3
5.4.1 Cleaning of the plate and ring .3
5.4.2 Cleaning of the measuring cup and syringe .3
5.5 Determination .3
5.6 Measuremen
...
ISO/DIS PRF 7392:2023(E)
ISO /TC 281/WG 2
Secretariat: JISC
Date: 2023-05-112024-01-24
Fine bubble technology — Evaluation method for determining
surface tension of ultrafine bubble dispersions
PROOF
---------------------- Page: 1 ----------------------
ISO/DISPRF 7392:2023(E2024(en)
© ISO 20232024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved
© ISO 2024 – All rights reserved
ii
---------------------- Page: 2 ----------------------
ISO/DISPRF 7392:2023(E2024(en)
Contents
Foreword . vi
Introduction. vii
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Apparatus .2
4.1 General .2
4.2 Wilhelmy method .2
4.3 du Noüy method .2
4.4 Pendant drop method .2
5 Procedure .2
5.1 Testing environment .2
5.2 Temperature measurement .2
5.3 Handling of the sample .3
5.4 Cleaning of the measuring unit .3
5.4.1 Cleaning of the plate and ring .3
5.4.2 Cleaning of the measuring cup and syringe .3
5.5 Determination.3
5.6 Measurement of blank water .3
6 Calculation and expression of results .
...
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