Temperature limitations in the use of hydrogels on leptosols in a semi-arid region of Brazil

Nascimento, Carla Danielle Vasconcelos do; Mota, Jaedson Claúdio Anunciato; Nascimento, Ícaro Vasconcelos do; Albuquerque, Gustavo Henrique da Silva; Simmons, Robert W.; Dias, Carlos Tadeu dos Santos; Costa, Mírian Cristina Gomes

doi:10.1016/j.geodrs.2021.e00407

Cited by 3 publications

(2 citation statements)

References 46 publications

(57 reference statements)

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“…For example, despite its importance in geophysics and in a wide variety of natural and engineered processes, 42–77 prediction and control of complex fluid flow, particle transport, and solid mechanics in porous media is challenging and often operates by trial and error. Even basic prediction of where injected fluid distributes through a porous medium, and of the associated macroscopic resistance to flow, remains elusive due to the time-dependent and multi-scale nature of the associated phenomena.…”

Section: The Challenge Of Modeling From the Grain Scalementioning

confidence: 99%

Soft matter physics of the ground beneath our feet

Voigtländer,

Houssais,

Bacik

et al. 2024

Soft Matter

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Section: The Challenge Of Modeling From the Grain Scalementioning

confidence: 99%

Soft matter physics of the ground beneath our feet

Voigtländer,

Houssais,

Bacik

et al. 2024

Soft Matter

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“…The physicochemical properties of the upper soil layer will determine the mutual interactions between water infiltration, runoff, and evaporation under given climatic conditions, and therefore influence its usability for supporting plant growth [6,7]. Hence, in recent decades, grains of super-absorbent polymers (SAP) have attracted increasing interest as soil additives to rationally tune these properties and to stabilize the soil [8][9][10]. In particular, the high number of hydrophilic groups in the polymer chains contributes to their ability to absorb water in amounts multiple times higher than their own mass [11,12].…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Time-Dependent Changes of Coefficient of Permeability for Superabsorbent Polymer-Soil Mixtures

et al. 2022

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Water uptake dynamics of superabsorbent polymers (SAP) in soil is of key importance for the optimum application of these materials in environmental engineering and agriculture, so goal of this paper is to determine time dependent values of coefficient of permeability for various SAP-soil mixtures. Retaining water in soil is a key requirement in critical zones to support plant growth. There is an urgent need for technologies that can increase soil water retention, given the increasing prevalence of droughts and scarcity of clean water as the climate changes, combined with the rising demand for food by a growing world population. SAPs are materials that can absorb significant amounts of water, and thus have tremendous potential to help increase water retention in soil. However, while some studies have characterized the equilibrium swelling behavior of SAPs in soil, how their addition influences the time-dependent flow of water through soil remains poorly understood. Here, we address this gap in knowledge by directly measuring the coefficient of permeability of SAP-soil mixtures, testing different soil grain sizes, SAP grain sizes, and different SAP-soil ratios. We find that SAP addition can dramatically hinder the flow rate of water through soil—reducing the permeability by several orders of magnitude, and in some cases causing complete blockage of water infiltration, at mass fractions as small as 1%. In this scenario coefficient of permeability of 1.23 × 10−4 m/s dropped by a factor of ~10 after 14 min, a factor of ~100 after 36 min, and by nearly a factor of ~1000 after 63 min, eventually causing complete blockage of infiltration after 67 min. Authors concluded that in this particular situation the size and quantity of SAP particles was enough to nearly completely fill the available pore space resulting in rendering the soil column almost completely impermeable. Moreover, we demonstrate that these effects are well-described by a simple hydraulic model of the mutual interactions between SAP and soil grains, providing more generally-applicable and quantitative principles to model SAP-soil permeability in applications. Ultimately, this work could help evaluate the optimal proportions and grain sizes of SAPs to use for a given soil to simultaneously achieve a desirable permeability along with increased water holding capacity in the plant root zone.

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Starch and itaconic acid-based superabsorbent hydrogels for agricultural application

Bora

Karak

2022

European Polymer Journal

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Temperature limitations in the use of hydrogels on leptosols in a semi-arid region of Brazil

Cited by 3 publications

References 46 publications

Soft matter physics of the ground beneath our feet

Soft matter physics of the ground beneath our feet

The Characteristics of Time-Dependent Changes of Coefficient of Permeability for Superabsorbent Polymer-Soil Mixtures

Starch and itaconic acid-based superabsorbent hydrogels for agricultural application

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