caa a22 4500 605466742 CHVBK 20210128100308.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00397-015-0845-z doi (NATIONALLICENCE)springer-10.1007/s00397-015-0845-z Two-step yielding in surfactant suspension pastes [Elektronische Daten] [Asheesh Shukla, Sumanth Arnipally, Manoj Dagaonkar, Yogesh Joshi] In this work, we investigate two-step yielding behavior of pastes containing anionic surfactants, clay, and abrasive particles of calcite. Such pastes are commercially used as hand dishwash paste. The surfactant suspension pastes have soft solid-like consistency with finite elastic modulus. The total volume fraction of the particulate matter in the same is around 36%; consequently, we attribute the elastic modulus of the same to the bonding between abrasive particles leading to attractive gel phase. We observe that the surfactant suspension pastes undergo physical aging during which evolution of relaxation time takes place. In dynamic strain sweep experiments, the pastes demonstrate clear signature of two-step yielding. It is observed that during the first yielding event, elastic modulus decreases while viscous modulus shows a maximum. For the second yielding event, however, elastic modulus demonstrates plateau before decreasing. While the first yielding event is observed to remain unaffected by the frequency of oscillations, the plateau values of elastic modulus, before the second yielding process, is observed to increase with frequency. We attribute the first yielding event in surfactant suspension pastes to rupture of network, while the second yielding event to breakage of the aggregates. Springer-Verlag Berlin Heidelberg, 2015 Two-step yielding nationallicence Surfactant paste nationallicence Gel nationallicence Soft glassy materials nationallicence Shukla Asheesh Department of Chemical Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, India aut Arnipally Sumanth Unilever R&D Bangalore, 64, Main Road, Whitefield, 560066, Bangalore, India aut Dagaonkar Manoj Unilever R&D Bangalore, 64, Main Road, Whitefield, 560066, Bangalore, India aut Joshi Yogesh Department of Chemical Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, India aut Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 353-364 0035-4511 54:5<353 2015 54 397 https://doi.org/10.1007/s00397-015-0845-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0845-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shukla Asheesh Department of Chemical Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, India aut NATIONALLICENCE 700 1- Arnipally Sumanth Unilever R&D Bangalore, 64, Main Road, Whitefield, 560066, Bangalore, India aut NATIONALLICENCE 700 1- Dagaonkar Manoj Unilever R&D Bangalore, 64, Main Road, Whitefield, 560066, Bangalore, India aut NATIONALLICENCE 700 1- Joshi Yogesh Department of Chemical Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, India aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 353-364 0035-4511 54:5<353 2015 54 397