Agar gel strength: A correlation study between chemical composition and rheological properties

Bertasa, Moira; Dodero, Andrea; Alloisio, Marina; Vicini, Silvia; Riedo, Chiara; Sansonetti, Antonio; Scalarone, Dominique Maria; Castellano, Maila

doi:10.1016/j.eurpolymj.2019.109442

Cited by 69 publications

(48 citation statements)

References 38 publications

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“…Figure 4 shows the obtained results for the prepared membranes alongside the nanofiber collection direction (i.e., 0°), with a similar behaviour observed perpendicularly (i.e., 90°). In the investigated frequency range, the samples showed a nearly constant trend of the extensional storage modulus E', as well as a slight decrease of the extensional loss modulus E" (data not shown), which is consistent with their predominantly elastic nature and localizes their response within the rubbery elastic plateau region [59][60][61]. The DMA spectrum of polymers can be indeed divided into several portions depending on the material properties.…”

Section: Dynamic-mechanical Propertiessupporting

confidence: 58%

Investigation of the Mechanical and Dynamic-Mechanical Properties of Electrospun Polyvinylpyrrolidone Membranes: A Design of Experiment Approach

et al. 2020

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Polyvinylpyrrolidone electrospun membranes characterized by randomly, partially, or almost completely oriented nanofibers are prepared using a drum collector in static (i.e., 0 rpm) or rotating (i.e., 250 rpm or 500 rpm) configuration. Besides a progressive alignment alongside the tangential speed direction, the nanofibers show a dimension increasing with the collector rotating speed in the range 410–570 nm. A novel design of experiment approach based on a face-centred central composite design is employed to describe membrane mechanical properties using the computation of mathematical models and their visualization via response surface methodology. The results demonstrate the anisotropic nature of the fibre-oriented membranes with Young’s modulus values of 165 MPa and 71 MPa parallelly and perpendicularly to the alignment direction, respectively. Above all, the proposed approach is proved to be a promising tool from an industrial point of view to prepare electrospun membranes with a tailored mechanical response by simply controlling the collector speed.

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Section: Dynamic-mechanical Propertiessupporting

confidence: 58%

Investigation of the Mechanical and Dynamic-Mechanical Properties of Electrospun Polyvinylpyrrolidone Membranes: A Design of Experiment Approach

et al. 2020

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“…As clearly shown, a higher polymer concentration corresponds both to a higher solution viscosity and a more marked shear-thinning behavior, i.e., a decrease of the viscosity as the shear rate increases. These results can be explained by the presence of entanglements, which increase with the polymer concentration and act as physical constraints thus significantly raising the viscosity (Xu et al 2014;Torres et al 2014;Costanzo et al 2016;Bertasa et al 2020).…”

Section: Viscosity Vs Polymer Concentrationmentioning

confidence: 99%

Rheological properties of sodium alginate solutions in the presence of added salt: an application of Kulicke equation

et al. 2020

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Mark-Houwink parameters are determined for sodium alginate with low (SA LV) and medium (SA MV) molecular mass via a rheological approach. Firstly, salt screening concentration and polyelectrolyte nature of the polymers are investigated. Despite both alginates behaving as neutral polymer in θ solvent, differences are observed between them with the strong associative nature of SA MV highlighted by an abnormal high viscosity concentration dependence compared with the predicted values. The polysaccharide-specific hydrodynamic volume (i.e., intrinsic viscosity) is determined via Fedors approach, which is proved to provide accurate results applicable to a wide concentration range. A viscosity-molecular mass-concentration relationship is finally derived to calculate Mark-Houwink parameters via a non-linear regression according to Kulicke equation; the obtained values are consistent with those reported in literature, confirming the semi-flexible nature of SA in the investigated environment and proving the effectiveness of the proposed approach for polyelectrolytes with added salt ions.

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“…Polysaccharide-based hydrogels, whose properties can be tuned simply changing the cross-linking conditions [71][72][73] are structures able to adsorb big quantities of water, making them extremely promising products for water quality investigation [74][75][76][77][78]. Their ability to absorb water is related to the hydrophilic functional groups attached to the polymer backbone, whereas their dissolution resistance is due to the cross-linking points between the macromolecules [79].…”

Section: Introductionmentioning

confidence: 99%

“…There, the guluronic acid residues of the polymer are directly coordinated by Pb 2+ to form a water insoluble, permanent 3D-network [83][84][85][86]. Owing to the low amount of ions required for the cross-linking reaction, such phenomenon can be exploited to assess the presence of Pb 2+ in water [71][72][73].…”

Section: Introductionmentioning

confidence: 99%

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Sodium Alginate Cross-Linkable Planar 1D Photonic Crystals as a Promising Tool for Pb2+ Detection in Water

et al. 2020

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Due to its high toxicity, Pb2+ pollution is a serious threat for human health and environments. However, in situ real-time detection of Pb2+ pollution is difficult and laboratory instruments are usually required. Then, the possibility to monitor water quality without laboratory instruments could lead to the extensive assessment of polluted water sources, especially in rural environments and developing countries where large lead concentrations are often found in surface water. Consequently, new simple colorimetric sensors are highly interesting in the field. In this work we report for the first time disposable polymer planar 1D photonic crystals made of poly (N-vinylcarbazole) as high refractive index medium and sodium alginate as low refractive index and active medium for the detection of Pb2+ in water. The detection relies on the ionic exchange occurring into the alginate matrix. This process effectively induces a physical cross-linking phenomenon, which inhibits water solubilization of the polymer. In turn, this affects the spectral response of the planar 1D photonic crystals modifying its color.

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Agar gel strength: A correlation study between chemical composition and rheological properties

Cited by 69 publications

References 38 publications

Investigation of the Mechanical and Dynamic-Mechanical Properties of Electrospun Polyvinylpyrrolidone Membranes: A Design of Experiment Approach

Investigation of the Mechanical and Dynamic-Mechanical Properties of Electrospun Polyvinylpyrrolidone Membranes: A Design of Experiment Approach

Rheological properties of sodium alginate solutions in the presence of added salt: an application of Kulicke equation

Sodium Alginate Cross-Linkable Planar 1D Photonic Crystals as a Promising Tool for Pb2+ Detection in Water

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