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Sangitra SN, Pujala RK. Temperature-dependent yield stress and wall slip behaviour of thermoresponsive Pluronic F127 hydrogels. RSC Adv 2024; 14:23772-23784. [PMID: 39077312 PMCID: PMC11284911 DOI: 10.1039/d4ra04825c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2024] [Accepted: 07/20/2024] [Indexed: 07/31/2024] Open
Abstract
This study explores the temperature-dependent dynamic yield stress of a triblock thermoresponsive polymer, Pluronic F127, with chemical structure (PEO)100(PPO)65(PEO)100, during the sol-gel transition. The yield stress can be defined as static, dynamic, or elastic, depending on the experimental protocol. We examine the dynamic yield stress estimation for this study, which usually entails utilizing non-Newtonian models like the Herschel-Bulkley (HB) or Bingham models to extrapolate the flow curve (shear rate against shear stress). Initially, we determine the yield stress using the HB model. However, apparent wall slip makes it difficult to calculate yield stress using conventional methods, which could lead to underestimates. To validate the existence of apparent wall slip in our trials, we carry out meticulous experiments in a range of rheometric geometries. To determine the true yield stress corrected for slip, we first use the traditional Mooney method, which requires labor-intensive steps and large sample sizes over various gaps in the parallel plate (PP) design. To overcome these drawbacks, we use a different strategy. We modify the Windhab model equation by adding slip boundary conditions to the HB equation, which allowed us to calculate the slip yield stress in addition to the true yield stress. In contrast to other typical thermoresponsive polymers like poly(N-isopropyl acrylamide) (PNIPAM), our findings demonstrate that PF127's yield stress obeys the Boltzmann equation and increases with temperature.
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Affiliation(s)
- Surya Narayana Sangitra
- Soft and Active Matter Group, Department of Physics and Center for Atomic, Molecular and Optical Sciences & Technologies (CAMOST), Indian Institute of Science Education and Research (IISER) Tirupati Yerpedu Tirupati 517619 Andhra Pradesh India
| | - Ravi Kumar Pujala
- Soft and Active Matter Group, Department of Physics and Center for Atomic, Molecular and Optical Sciences & Technologies (CAMOST), Indian Institute of Science Education and Research (IISER) Tirupati Yerpedu Tirupati 517619 Andhra Pradesh India
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De J Rivera A, Garcia-Blanco YJ, Quitian-Ardila LH, Germer EM, Franco AT. Visualizing flow dynamics and restart of Carbopol gel solutions in tube and parallel-plates geometries with wall slip. SOFT MATTER 2024. [PMID: 39023447 DOI: 10.1039/d4sm00319e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
The present study examines the impact of slip in Carbopol solutions during the restart flow in pipelines utilizing in situ visualization techniques. Rheological tests were conducted using smooth and hatched parallel plate geometries to obtain the rheological characteristics of the solutions. The behavior of the solutions in the creep tests is compared with those in the experimental unit. Three flow regimes were identified through rheological and experimental setup tests: non-flow, slip, and yielded. The slip regime allowed the establishment of a slip static yield stress value, indicating significant deformation states, and a restart pressure decrease of about 61% when compared to the static yield stress. The flow dynamics under the wall slip effect is captured by velocity profiles, velocity contour maps and velocity gradient. Transient correlations of the scaling law type were determined, with wall slip in proportion to the velocity gradient and wall shear stress. Additionally, the concentration of viscoplastic material in the solution increased the scaling law index. This research seeks to provide valuable findings by quantifying the effects of apparent wall slip through in situ measurements. Such insights are crucial for designing and managing pipeline transport systems that handle yield stress fluids, applicable across various industries including cosmetics, food processing, and the production of waxy oils.
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Affiliation(s)
- Angel De J Rivera
- Academic Department of Mechanics - DAMEC, Postgraduate Program in Mechanical and Materials Engineering - PPGEM, Research Center for Rheology and Non-Newtonian Fluids - CERNN, Federal University of Technology - Paraná - UTFPR, R. Deputado Heitor Alencar Furtado, 5000 - Bloco N - Ecoville, 81280-340 Curitiba, PR, Brazil.
| | - Yamid J Garcia-Blanco
- Academic Department of Mechanics - DAMEC, Postgraduate Program in Mechanical and Materials Engineering - PPGEM, Research Center for Rheology and Non-Newtonian Fluids - CERNN, Federal University of Technology - Paraná - UTFPR, R. Deputado Heitor Alencar Furtado, 5000 - Bloco N - Ecoville, 81280-340 Curitiba, PR, Brazil.
| | - Luis H Quitian-Ardila
- Academic Department of Mechanics - DAMEC, Postgraduate Program in Mechanical and Materials Engineering - PPGEM, Research Center for Rheology and Non-Newtonian Fluids - CERNN, Federal University of Technology - Paraná - UTFPR, R. Deputado Heitor Alencar Furtado, 5000 - Bloco N - Ecoville, 81280-340 Curitiba, PR, Brazil.
| | - Eduardo M Germer
- Academic Department of Mechanics - DAMEC, Postgraduate Program in Mechanical and Materials Engineering - PPGEM, Research Center for Rheology and Non-Newtonian Fluids - CERNN, Federal University of Technology - Paraná - UTFPR, R. Deputado Heitor Alencar Furtado, 5000 - Bloco N - Ecoville, 81280-340 Curitiba, PR, Brazil.
| | - Admilson T Franco
- Academic Department of Mechanics - DAMEC, Postgraduate Program in Mechanical and Materials Engineering - PPGEM, Research Center for Rheology and Non-Newtonian Fluids - CERNN, Federal University of Technology - Paraná - UTFPR, R. Deputado Heitor Alencar Furtado, 5000 - Bloco N - Ecoville, 81280-340 Curitiba, PR, Brazil.
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Maciel BR, Baki K, Oelschlaeger C, Willenbacher N. The Influence of Rheological and Wetting Properties of Hydrogel‐based Bio‐Inks on Extrusion‐based Bioprinting. CHEM-ING-TECH 2022. [DOI: 10.1002/cite.202100139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bruna Regina Maciel
- Karlsruhe Institute of Technology (KIT) Institute for Mechanical Process Engineering and Mechanics Gotthard-Franz-Strasse 3, Building 50.31 76131 Karlsruhe Germany
| | - Kubilay Baki
- Karlsruhe Institute of Technology (KIT) Institute for Mechanical Process Engineering and Mechanics Gotthard-Franz-Strasse 3, Building 50.31 76131 Karlsruhe Germany
| | - Claude Oelschlaeger
- Karlsruhe Institute of Technology (KIT) Institute for Mechanical Process Engineering and Mechanics Gotthard-Franz-Strasse 3, Building 50.31 76131 Karlsruhe Germany
| | - Norbert Willenbacher
- Karlsruhe Institute of Technology (KIT) Institute for Mechanical Process Engineering and Mechanics Gotthard-Franz-Strasse 3, Building 50.31 76131 Karlsruhe Germany
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Malkin AY, Patlazhan SA. Wall slip for complex liquids - Phenomenon and its causes. Adv Colloid Interface Sci 2018; 257:42-57. [PMID: 29934140 DOI: 10.1016/j.cis.2018.05.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 05/27/2018] [Accepted: 05/28/2018] [Indexed: 11/28/2022]
Abstract
In this review, we tried to qualify different types and mechanisms of wall slip phenomenon, paying particular attention to the most recent publications and issues. The review covers all type of fluids - homogeneous low molecular weight liquids, polymer solution, multi-component dispersed media, and polymer melts. We focused on two basic concepts - fluid-solid wall interaction and shear-induced fluid-to-solid transitions - which are the dominant mechanisms of wall slip. In the first part of the review, the theoretical and numerical studies of correlation of wetting properties and wall slip of low molecular weight liquids and polymeric fluids are reviewed along with some basic experimental results. The influence of nanobubbles and microcavities on the effectiveness of wall slip is illuminated with regard to the bubble dynamics, as well as their stability at smooth and rough interfaces, including superhydrophobic surfaces. Flow of multi-component matter (microgel pastes, concentrated suspensions of solid particles, compressed emulsions, and colloidal systems) is accompanied by wall slip in two cases. The first one is typical of viscoplastic media which can exist in two different physical states, as solid-like below the yield point and liquid-like at the applied stresses exceeding this threshold. Slip takes place at low stresses. The second case is related to the transition from fluid to solid states at high deformation rates or large deformations caused by the strain-induced glass transition of concentrated dispersions. In the latter case, the wall effects consist of apparent slip due to the formation of a low viscous thin layer of fluid at the wall. The liquid-to-solid transition is also a dominant mechanism in wall slip of polymer melts because liquid polymers are elastic fluids which can be in two relaxation states depending on the strain rate. The realization of these mechanisms is determined by polymer melt interaction with the solid wall.
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Affiliation(s)
- A Ya Malkin
- Russian Academy of Sciences, Institute of Petrochemical Synthesis, 29, Leninski Prospect, Moscow 119991, Russia.
| | - S A Patlazhan
- Russian Academy of Sciences, Semenov Institute of Chemical Physics, 4, Kosygin Street, Moscow 119991, Russia; Russian Academy of Sciences, Institute of Problems of Chemical Physics, 1, Semenov Avenue, Chernogolovka, Moscow 142432, Russia
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