Solvent composition and rheology of starch–DMSO–water solutions

Vasconcelos, C.L. de; Pereira, M.R.; Fonseca, J. L. C.

doi:10.1002/app.1214

Cited by 25 publications

(13 citation statements)

References 21 publications

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“…1, all the samples in the shear rate range in question (10 -1000 s À1 ) showed a shear-thinning behavior, and could be considered as pseudo-plastic fluids. This shear-thinning behavior of starch has also been reported in other solvents such as water, DMSO, and NMMO [23][24][25]. From Fig.…”

Section: Rheological Proprieties Of Starch In Zncl 2 Aqueous Solutionsupporting

confidence: 82%

Investigation of rheological properties and conformation of cassava starch in zinc chloride solution

et al. 2017

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Zinc chloride aqueous solution is a non‐derivatizing solvent for starch, and can be used as a media for homogeneous starch modification. Here, the rheological properties of starch in ZnCl2 aqueous solution under different conditions are considered. Specifically, a large number (120) of viscosity–shear‐rate curves for starch–ZnCl2 solutions with different starch contents, ZnCl2 concentrations, and temperatures were obtained and modeled using a master curve method. In particular, the power‐law index (n) from the modeling could accurately classify the starch molecules in ZnCl2 aqueous solutions into an insoluble state, a dilute state, a semi‐dilute state, and a sticky state, reflecting the different degrees of chain interactions in the solution. In particular, the sticky state would be mostly likely be controlled by the zinc–starch complex, which made the rheological behavior entirely different from that at low ZnCl2 concentrations. The knowledge obtained from this study can be used to guide the homogeneous modification of starch and the fabrication of starch‐based materials using green solvents such as aqueous ZnCl2 with desired properties.

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Section: Rheological Proprieties Of Starch In Zncl 2 Aqueous Solutionsupporting

confidence: 82%

Investigation of rheological properties and conformation of cassava starch in zinc chloride solution

et al. 2017

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“…The values of shear stress τ and shear rate $\dot{\gamma}$ were adjusted to the following empirical equation:23 where η is the Newtonian viscosity coefficient (or zero‐shear‐rate viscosity) and α is a constant related to the type of fluid: Newtonian fluid (α = 0), pseudoplastic fluid (α < 0), and dilatant fluid (α > 0).…”

Section: Methodsmentioning

confidence: 99%

Rheology of polyurethane solutions with different solvents

Vasconcelos

Martins

Ferreira

et al. 2001

Polymer International

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Hard segment hydrogen bonding interactions in a particular polyurethane segmented copolymer have been analysed through a viscometric approach to determine the behaviour of polyurethane solutions with different solvent compositions. Analysis of log ηspversus log c[η] master curves (solely comprising dilute and semidilute regimes) showed that these systems could be differentiated by the slope of the first part of the curve (dilute regime), the characteristic reduced concentration c*[η], and the slope of the second part of the curve (semidilute regime), differences which were related to a possible occurrence of polymer aggregates. Experiments with solutions in the concentrated regime, at different temperatures, were used to relate non‐Newtonian behaviour to hydrogen bonding. © 2001 Society of Chemical Industry

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“…Hence, starch is very attractive polymer additive for application to flexible photovoltaic devices. [ 114 ] The authors focused on the influence of starch as a rheological modifier on both the viscosity of the perovskite precursor/DMSO solution and the deposition and crystallization of the perovskite on different flat substrates. The results showed that the starch increased the viscosity of the perovskite precursor solutions, thereby enabling top‐quality perovskite films to be deposited in one step (without toxic solvent dripping); drastically influenced the polycrystal size and morphology by acting as a template for growing the perovskite films; and improved the humidity resistance and bending stress of the resulting perovskite films and solar cells.…”

Section: Properties and Classification Of Psc Polymeric Additivesmentioning

confidence: 99%

Role and Contribution of Polymeric Additives in Perovskite Solar Cells: Crystal Growth Templates and Grain Boundary Passivators

et al. 2021

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Polymers or polymeric materials are used as additives for promoting the nucleation and crystallization of perovskite films to increase the crystal grain size. Due to their high molecular weight, polymers remain within perovskite‐crystal grain boundaries (GBs), where they passivate trap sites. Furthermore, some polymers function as charge‐transport materials in interfacial layers to effectively separate charge carriers and reduce charge recombination. Certain hydrophobic polymers protect perovskite films against moisture, whereas elastic polymers contribute to the mechanical resilience of perovskite films by crosslinking and self‐healing. Although polymeric additives have become essential to perovskite fabrication, a thorough review has not summarized their application to perovskite solar cells. Therefore, various strategies are comprehensively discussed for incorporating typical polymers and 1D polymeric materials into perovskite materials to improve the efficiency and stability of perovskite devices. Herein, thermoplastic, hydrophilic, and conductive polymers and elastomers are focused and related works are chronologically discussed to clearly elucidate the advances in perovskite devices.

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Solvent composition and rheology of starch–DMSO–water solutions

Cited by 25 publications

References 21 publications

Investigation of rheological properties and conformation of cassava starch in zinc chloride solution

Investigation of rheological properties and conformation of cassava starch in zinc chloride solution

Rheology of polyurethane solutions with different solvents

Role and Contribution of Polymeric Additives in Perovskite Solar Cells: Crystal Growth Templates and Grain Boundary Passivators

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