Rheology of Soft Materials

Wyss, Hans M.

doi:10.1002/9781119220510.ch9

Cited by 17 publications

(14 citation statements)

References 34 publications

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“…4) obtained from Eq. (2) are in remarkably good agreement with the results obtained with standard DDM, even though they are affected by a 50% uncertainty that is mainly due to the 15% uncertainty in the particle size.…”

Section: Viscoelastic Fluidsupporting

confidence: 80%

“…(1) and (2). Equations (B3) and (B4) show that the error done in estimating θ 2 (t) directly as − 1 3 ln f RT is of the order (aq) 2 .…”

Section: Appendix B: Determination Of the Amsd From Combined P-ddm Anmentioning

confidence: 99%

“…For instance, a dense colloidal suspension may exhibit a solid-like response upon application of small-amplitude, fast deformations whereas it may be more similar to a liquid upon applying largeamplitude, slow deformations. Converting these important but qualitative considerations into some quantitatively and reproducibly determined mechanical moduli of the materials is the realm of rheology [2].…”

Section: Introductionmentioning

confidence: 99%

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Differential dynamic microscopy microrheology of soft materials: A tracking-free determination of the frequency-dependent loss and storage moduli

Edera

Bergamini

Trappe

et al. 2017

Phys. Rev. Materials

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Particle-tracking microrheology (PT-μr) exploits the thermal motion of embedded particles to probe the local mechanical properties of soft materials. Despite its appealing conceptual simplicity, PT-μr requires calibration procedures and operating assumptions that constitute a practical barrier to its wider application. Here we demonstrate differential dynamic microscopy microrheology (DDM-μr), a tracking-free approach based on the multiscale, temporal correlation study of the image intensity fluctuations that are observed in microscopy experiments as a consequence of the translational and rotational motion of the tracers. We show that the mechanical moduli of an arbitrary sample are determined correctly over a wide frequency range provided that the standard DDM analysis is reinforced with an iterative, self-consistent procedure that fully exploits the multiscale information made available by DDM. Our approach to DDM-μr does not require any prior calibration, is in agreement with both traditional rheology and diffusing wave spectroscopy microrheology, and works in conditions where PT-μr fails, providing thus an operationally simple, calibration-free probe of soft materials.

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Section: Viscoelastic Fluidsupporting

confidence: 80%

“…(1) and (2). Equations (B3) and (B4) show that the error done in estimating θ 2 (t) directly as − 1 3 ln f RT is of the order (aq) 2 .…”

Section: Appendix B: Determination Of the Amsd From Combined P-ddm Anmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Differential dynamic microscopy microrheology of soft materials: A tracking-free determination of the frequency-dependent loss and storage moduli

Edera

Bergamini

Trappe

et al. 2017

Phys. Rev. Materials

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“…If a sample is elastic or highly structured, the modulus of elasticity is high. However, viscous modulus is a measure of the energy lost by the cycle and represents the liquid component or component with less viscosity (Binder et al, 2017;Lukic, Jaksic, Krstonosic, Cekic, & Savic, 2012;Wyss, 2018). Since, LVR for prepared formulations was found 0.1-7 Pa, frequency sweep test was performed within the linear region at constant shear stress (1 Pa) (Lukic et al, 2012).…”

Section: Rheological Study Of the Formulationsmentioning

confidence: 99%

Impact of different emollient esters on body emulsions: Sensory, physicochemical, and biometrological characterization

Fabbron-Appas

Pandey

Parekh

et al. 2021

Journal of Sensory Studies

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A range of liquid emollient ester-loaded body emulsions were evaluated on the basis of sensory profile, consumer perception, physicochemical, biometrological, and rheological performances. This was complemented by skin hydration and transepidermal water loss (TEWL) studies performed using a Corneometer ® and Tewameter ® , respectively. The rheological studies showed similar behavior of creams on variation of shear stress, frequency, and temperature. However, skin hydration performances of creams were found varied when compared between base cream and emollient ester-containing creams. In case of the TEWL study, base cream (F1, no ester) and octyl palmitate-containing cream (F2), exhibited the most protective behavior for the skin with minimal water loss. Sensory profiles of creams were obtained using the sensory descriptive analysis method. A study performed with human consumers (as subjects) using the difference of test attributes (directional) method showed the importance of sensory evaluation with consumers and proved to be an interesting analysis for comparison with the sensorial profile. In this case, the attributes with the highest intensity in the evaluated creams were, that is, spreadability, slipping, and dry touch. Stability studies of creams were performed for 90 days under different storage conditions. Stability studies showed octyl stearate-containing (F2) and palmitate-containing (F5) creams exhibited best stability under extended storage conditions. This research has demonstrated the importance of physicochemical characterization and sensory evaluations performed with consumers for more targeted analysis of cream-based formulations to differentiate product characteristics and identify attributes-led preferences. Practical applicationsResults from the present work suggest that emollients are directly responsible for sensory characteristics such as spreading, absorption, and touch on the skin; they can influence the viscosity and appearance of emulsions. After application on the skin, they regulate the moisture content of the epidermis together with the humectants. This research has demonstrated the importance of sensory evaluation, especially performed with consumers, which may be considered a more targeted analysis to differentiate product characteristics and help in the choice of emollient with the desired characteristics for the cosmetic product.

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“…Rheology is a study of the flow characteristics of structured materials and nanocomposite materials. [91] Generally, rheological properties of gel depend upon the gel microstructure, strength and solvent interaction, which directly reflect on the elastic behavior and flow characteristics. [92] The variation of storage modulus (G′) and loss modulus (G′′) of hydrogel prepared from compound 4a at a concentration of 1.0% w/v were measured as a function of applied frequency at a constant strain at room temperature using frequency sweep experiment.…”

Section: Rheological Studiesmentioning

confidence: 99%

Supramolecular gels of gluconamides derived from renewable resources: Antibacterial and anti‐biofilm applications

et al. 2020

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Carbohydrates are versatile materials widely used for several applications including food, pharmaceuticals, cosmetics, and drug delivery systems due to their inherent properties such as non-toxicity, biodegradability, and bio-compatibility. Specifically, the urge on carbohydrate research is due to its significance in the biological system, for example, a glycoprotein found in the extracellular matrix, involved in signaling pathways, cell-cell interaction and cell-matrix interaction. Because of the increase in demand of glycolipids for biological applications, in this report, a set of three structurally related gluconamide-based amphiphiles were synthesized from renewable resources, δ-gluconolactone and cashew nut shell liquid. The molecular structure of the synthesized glycolipids was characterized by NMR and mass spectral techniques. Molecular self-assembly of gluconamide-based amphiphiles was investigated relative to the molecular structure and nature of the solvent used. Interestingly, the nature of the hydrophobic tail present in the glycolipids influences the self-assembly pattern, which results in a hydrogel, organogel and highly insoluble nanorods. Gelation studies clearly revealed that the involvement of different magnitude of non-covalent interactions such as hydrogen bonding, π-π stacking and van der Waals interaction. Morphology of self-assembled architecture was investigated by optical microscopy, FESEM and FETEM analysis. The mechanism involved in the molecular self-assembly has been deduced by small angle XRD analysis. Thermo reversibility and the thixotropic nature of the derived gels were identified by rheological measurements. Further, antimicrobial and biofilm inhibitory activity of gluconamide-based amphiphiles were studied against various pathogenic bacterial strains Staphylococcus aureus, Listeria monocytogenes, Salmonella This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Rheology of Soft Materials

Cited by 17 publications

References 34 publications

Differential dynamic microscopy microrheology of soft materials: A tracking-free determination of the frequency-dependent loss and storage moduli

Differential dynamic microscopy microrheology of soft materials: A tracking-free determination of the frequency-dependent loss and storage moduli

Impact of different emollient esters on body emulsions: Sensory, physicochemical, and biometrological characterization

Supramolecular gels of gluconamides derived from renewable resources: Antibacterial and anti‐biofilm applications

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