11,668 results match your criteria rheological properties

Changes in molecular structure of extracellular polymeric substances (EPS) with temperature in relation to sludge macro-physical properties.

Water Res 2021 May 31;201:117316. Epub 2021 May 31.

School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.

Extracellular polymeric substances (EPS) are important components of activated sludge, whose content and composition have important effects on the macro-physical properties of sludge. In this study, the response of EPS in sludge to temperature (-40-200 °C) was systematically investigated using XAD resin fractionation, variable-temperature infrared spectra (VTIS) and two-dimensional correlation spectroscopy (2D-COS). The relationships between the molecular structure of EPS and the macro-physical properties (rheological property and dewatering performance) of waste activated sludge (WAS) at varying temperature were also established. Read More

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Dopamine-Substituted Multidomain Peptide Hydrogel with Inherent Antimicrobial Activity and Antioxidant Capability for Infected Wound Healing.

ACS Appl Mater Interfaces 2021 Jun 15. Epub 2021 Jun 15.

Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China.

Wound infection can cause a delay in wound healing or even wound deterioration, threatening patients' lives. The excessive accumulation of reactive oxygen species (ROS) in infected wounds activates a strong inflammatory response to delay wound healing. Therefore, it is highly desired to develop hydrogels with inherent antimicrobial activity and antioxidant capability for infected wound healing. Read More

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Cheese quality from cows given a tannin extract in 2 different grazing seasons.

J Dairy Sci 2021 Jun 11. Epub 2021 Jun 11.

Independent researcher at INRAE, Université Clermont Auvergne, Vetagro Sup, UMRH, 63122, Saint-Genès-Champanelle, France.

The aim of the present study was to compare the effect of dietary tannins on cow cheese quality in 2 different grazing seasons in the Mediterranean. Two experiments were performed on 14 dairy cows reared in an extensive system. The first experiment took place in the wet season (WS), and the second experiment took place in the dry season (DS). Read More

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Effect of solvent type on the dispersion quality of spray-and freeze-dried CNCs in PLA through rheological analysis.

Carbohydr Polym 2021 Sep 25;268:118243. Epub 2021 May 25.

Metallurgical and Materials Engineering Department, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, Maslak, Istanbul 34469, Turkey; Polymer Science and Technology Program, Institute of Science and Technology, Istanbul Technical University, Maslak, Istanbul 34469, Turkey. Electronic address:

Polylactide (PLA) nanocomposites with spray-and freeze-dried cellulose nanocrystals (i.e., SCNC and FCNC) were prepared through solution casting using four different solvents: tetrahydrofuran (THF), chloroform (CHL), dimethylformamide (DMF), and dimethyl sulfoxide (DMSO). Read More

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September 2021

Modulating storage stability of binary gel by adjusting the ratios of starch and kappa-carrageenan.

Carbohydr Polym 2021 Sep 28;268:118264. Epub 2021 May 28.

State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China. Electronic address:

This study aimed to investigate the interaction mechanism of the waxy starch and kappa carrageenan (KC) gel with different ratios during co-gelatinization and storage. Water distributions, mobilities and rheological properties of the mixture gels were studied. When KC concentration was low (0. Read More

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September 2021

High-Speed Blow Spinning of Neat Graphene Fibrous Materials.

Nano Lett 2021 Jun 14. Epub 2021 Jun 14.

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, P. R. China.

Achieving high spinning speed is critical to the production efficiency and viable application of fiber species. Graphene fiber (GF) has recently emerged as a carbonaceous fiber with excellent functionality. However, the extremely low wet spinning speed of GF has limited its applications. Read More

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Bio-plotted hydrogel scaffold with core and sheath strand-enhancing mechanical and biological properties for tissue regeneration.

Colloids Surf B Biointerfaces 2021 Jun 10;205:111919. Epub 2021 Jun 10.

Department of Nature-Inspired System and Application, Korea Institute of Machinery and Materials (KIMM), Daejeon, 34103, Republic of Korea. Electronic address:

Three-dimensional bio-plotted scaffolds constructed from encapsulated biomaterials or so-called "bio-inks" have received much attention for tissue regeneration applications, as advances in this technology have enabled more precise control over the scaffold structure. As a base material of bio-ink, sodium alginate (SA) has been used extensively because it provides suitable biocompatibility and printability in terms of creating a biomimetic environment for cell growth, even though it has limited cell-binding moiety and relatively weak mechanical properties. To improve the mechanical and biological properties of SA, herein, we introduce a strategy using hydroxyapatite (HA) nanoparticles and a core/sheath plotting (CSP) process. Read More

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Hydrogels Based on Oxidized Cellulose Sulfates and Carboxymethyl Chitosan: Studies on Intrinsic Gel Properties, Stability, and Biocompatibility.

Macromol Biosci 2021 Jun 13:e2100098. Epub 2021 Jun 13.

Department of Biomedical Materials, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Heinrich-Damerow-Strasse 4, 06120, Halle (Saale), Germany.

Cellulose and chitosan are excellent components for the fabrication of bioactive scaffolds, as they are biocompatible and abundantly available. Their derivatives Ocarboxymethyl chitosan (CMChi) and oxidized cellulose sulfate (oxCS) can form in situ gelling, bioactive hydrogels, due to the formation of imine bonds for crosslinking. Here the influence of the degrees of sulfation (DS), oxidation (DO), and the molecular weight of oxCS on intrinsic and rheological properties of such hydrogels and their ability to support the survival and growth of human-adipose-derived stem cells (hADSC) is investigated. Read More

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An experimental study on the role of inter-particle friction in the shear-thinning behavior of non-Brownian suspensions.

Soft Matter 2021 Jun 14. Epub 2021 Jun 14.

Institut de Physique de Nice, UMR 7010 CNRS-Université Côte d'Azur, 06108 Nice cedex 2, France.

This paper focuses on shear-thinning in non-Brownian suspensions. In particular, it proposes a quantitative experimental validation of the model proposed by Lobry et al. [J. Read More

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Quantification of the ion transport mechanism in protective polymer coatings on lithium metal anodes.

Chem Sci 2021 Apr 12;12(20):7023-7032. Epub 2021 Apr 12.

Department of NanoEngineering 9500 Gilman Drive, La Jolla California 92093 USA

Protective Polymer Coatings (PPCs) have been proposed to protect lithium metal anodes in rechargeable batteries to stabilize the Li/electrolyte interface and to extend the cycle life by reducing parasitic reactions and improving the lithium deposition morphology. However, the ion transport mechanism in PPCs remains unclear. Specifically, the degree of polymer swelling in the electrolyte and the influence of polymer/solvent/ion interactions are never quantified. Read More

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Characterization of covalent, feruloylated polysaccharide gels by pulsed field gradient-stimulated echo (PFG-STE)-NMR.

Carbohydr Polym 2021 Sep 20;267:118232. Epub 2021 May 20.

Institute of Applied Biosciences, Department of Food Chemistry and Phytochemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany. Electronic address:

Translational mobility of guest molecules such as water and glucose in gels that are based on feruloylated polysaccharides appears to be critical to understand their nutritional and functional properties. Here, the applicability of PFG-STE-NMR on feruloylated gels was proven, and relationships to rheological data were studied. Arabinoxylans and pectins were extracted from by-products using varying conditions. Read More

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September 2021

A polysaccharide from Lignosus rhinocerotis sclerotia: Self-healing properties and the effect of temperature on its rheological behavior.

Carbohydr Polym 2021 Sep 19;267:118223. Epub 2021 May 19.

College of Food Science and Technology and MOE Key Laboratory of Environment Correlative Dietology, Huazhong Agricultural University, Wuhan 430070, China. Electronic address:

This work investigated the self-healing properties of Lignosus rhinocerotis polysaccharide (LRP) and the effect of temperature on its rheological behavior. Dynamic sweep tests (strain sweep, frequency sweep, and time sweep) showed that the LRP/water system possessed self-healing properties due to the entangled network formed by hyperbranched LRP molecular chains. The flow activation energy of LRP solution calculated by Arrhenius equation was shown to decrease with increasing LRP concentration, indicating that LRP solution at higher concentration was less sensitive to temperature. Read More

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September 2021

Enhanced antimicrobial activity of konjac glucomannan nanocomposite films for food packaging.

Carbohydr Polym 2021 Sep 16;267:118215. Epub 2021 May 16.

College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China. Electronic address:

This paper aims at providing a new strategy for developing konjac glucomannan-based antibacterial films with excellent performances. Here, novel nanocomposite films based on photodynamic and photothermal synergism strategy were developed by incorporating graphite carbon nitride nanosheets/MoS nanodots (CNMo) into konjac glucomannan (KGM) matrix. Scanning electron microscope, transmission electron microscope, high resolution transmission, high angle annular dark field and element mapping confirmed the successful fabrication of CNMo. Read More

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September 2021

The effects of extruded endogenous starch on the processing properties of gluten-free Tartary buckwheat noodles.

Carbohydr Polym 2021 Sep 7;267:118170. Epub 2021 May 7.

State Key Laboratory of Food Science and Technology, Jiangnan University, 1800, Lihu Avenue, Wuxi 214122, Jiangsu Province, PR China; School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, PR China; Qingdao Special Food Research Institute, Qingdao 266109, Shandong Province, PR China. Electronic address:

The lack of gluten in Tartary buckwheat has always been the main limiting factor of their development. This paper explored how to improve the processing quality of gluten-free Tartary buckwheat noodles (GF-TBNs) by introducing extruded starch into Tartary buckwheat flour (TBF) and the underlying mechanism was also elucidated. Extruded Tartary buckwheat starch (ETBS) was obtained under different extrusion conditions. Read More

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September 2021

Effect of the rheological properties of the liquid carrier on the in vitro swallowing of Solid Oral Dosage Forms.

J Texture Stud 2021 Jun 12. Epub 2021 Jun 12.

INRAE, AgroParisTech, UMR SayFood, Université Paris Saclay, Massy, France.

Solid Oral Dosage Forms (SODF) are the most popular oral drug delivery forms, but they can be difficult to swallow, especially for patients suffering from swallowing disorders. This study investigated the dynamics of different combinations of liquid carriers and SODF during the oral phase of swallowing using an in vitro model. The rheological properties of the carriers were characterized using shear and extensional rheometry, and their effect on bolus velocity, bolus shape, post-swallow residues, and SODF position within the bolus was evaluated. Read More

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Fluid-structure interaction modeling of lactating breast: Newtonian vs. non-Newtonian milk.

J Biomech 2021 May 13;124:110500. Epub 2021 May 13.

Department of Mechanical Engineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, USA. Electronic address:

Breastfeeding is a highly dynamic and complex mechanism. The suckling process by the infant involves compression and intra-oral vacuum pressure, leading to milk expression from breast. The accumulated milk from the nipple varies depending on the milk properties and transient flow rate during the suckling cycle. Read More

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Facile design of lidocaine-loaded polymeric hydrogel to persuade effects of local anesthesia drug delivery system: complete and toxicity analyses.

Drug Deliv 2021 Dec;28(1):1080-1092

Department of Anesthesiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.

The principal goal of the present investigation was to enterprise new and effective drug delivery vesicle for the sustained delivery of local anesthetic lidocaine hydrochloride (LDC), using a novel combination of copolymeric hydrogel with tetrahydroxyborate (COP-THB) to improve bioactivity and therapeutic potential. To support this contention, the physical and mechanical properties, rheological characteristics, and component release of candidate formulations were investigated. An optimized formulation of COP-THB containing LDC to an upper maximum concentration of 1. Read More

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December 2021

Effects of acid and alkaline treatments on physicochemical and rheological properties of tilapia surimi prepared by pH shift method during cold storage.

Food Res Int 2021 Jul 19;145:110424. Epub 2021 May 19.

Department of Food Science & Technology, National University of Singapore, Singapore 117542, Singapore; National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Suzhou, Jiangsu 215123, PR China. Electronic address:

Microbial, physicochemical, rheological, and microstructural changes of surimi prepared by pH shift methods and the traditional water-washing method during cold storage were investigated. The starting aerobic mesophilic count (AMC) of pH shift surimi was around 1 log CFU/g lower than water-washed surimi, suggesting antimicrobial effects of the pH shift. All samples could be stored for 5 to 6 days based on the AMC results. Read More

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Effect of ultrasound-assisted thawing on gelling and 3D printing properties of silver carp surimi.

Food Res Int 2021 Jul 11;145:110405. Epub 2021 May 11.

The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 214122 Wuxi, Jiangsu, China.

The effects of ultrasound-assisted thawing (at ultrasonic frequencies of 45, 80 and 100 kHz) and water immersion thawing on gelling and 3D printing properties of silver carp surimi were examined. Ultrasound-assisted thawing (UT) can save 13.5%~40. Read More

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Rheological behaviors and physicochemical changes of doughs reconstituted from potato starch with different sizes and gluten.

Food Res Int 2021 Jul 11;145:110397. Epub 2021 May 11.

Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100193, PR China. Electronic address:

The effects of different sizes of potato starch on the rheological and physiochemical properties of model doughs were investigated. Compared with those of model dough prepared from original starch, the strengths of model doughs prepared from fractionated starch were higher, which indicates that fractionated starch can positively influence the properties of doughs. Additionally, the model dough prepared using large size starch granules had higher storage modulus (G'), loss modulus (G''), and composite modulus (|G*|) values compared to those of other types of dough; it also had the highest elasticity, viscosity, and strength. Read More

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A bactericide peptide changing the static and dilatational surface elasticity properties of zwitterionic lipids at the air-water interface: Relationship with the thermodynamic, structural and morphological properties.

Biophys Chem 2021 Jun 6;277:106638. Epub 2021 Jun 6.

Department of Chemistry, Federal University of Sao Paulo, Diadema, SP, Brazil. Electronic address:

In this paper, we studied how different hydrophilicity degrees of the polar groups of the lipids dipalmitoylphosphatidylcholine (DPPC) and dipalmitoyl phosphatidylethanolamine (DPPE) influence the interaction of the antibiotic peptide vancomycin (VC), affecting the physicochemical properties of the monolayers, including thermodynamic, rheological, structural and morphological ones. Lipid Langmuir monolayers were prepared at air-water interfaces with VC aqueous solution as subphase and characterized with tensiometry, Brewster angle microscopy, infrared spectroscopy, dilatational, and interfacial shear rheology. The presence of PC or PE groups as polar head groups of the phospholipid monolayers modulated the interaction of VC adsorbing from the aqueous subphase since for DPPC, vancomycin condenses the monolayer, making it less stable, fluid, and more disordered. Read More

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Georgian Med News 2021 Apr(313):173-176

2Tbilisi State Medical University, Georgia.

In this review, we discuss the role of adrenoceptors in the regulation of the rheological functions of erythrocytes. β-adrenoceptors play an important role in the regulation of erythrocytes functions and metabolism. They participate in the modification of transport membrane proteins (Na+/K+-ATPase, Ca+2-ATPase, Na+/K+/2Cl-cotransporter, Na+/H+-antiporter, CAT-1, Ca2+-dependent K+ channels (Gard channels), the activity of adenylate cyclase and cAMP, AMP-dependent activation of the L-arginine/NOS system and erythrocyte NOS) and by this way modulate the cells volume, rheological properties (deformability, aggregability), intensity of NO synthesis and ATP reliase. Read More

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3D-printed construct from hybrid suspension as spatially and temporally controlled protein delivery system.

J Biomater Appl 2021 Jun 9:8853282211023257. Epub 2021 Jun 9.

School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang Hunan, China.

Protein delivery systems have been extensively applied in controlled releasing of protein or polypeptides for therapeutic treatment or tissue regeneration. While 3 D printing technology shows great promise in novel dosage form with tailoring dose size and drug release profile, 3 D printable protein delivery system has to face many difficult challenges. In this study, we developed a hybrid suspension combining Eudragit polyacrylate colloid as matrix material and Pluronic polyether hydrogel as diffusion channel for protein release. Read More

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Influence of the Polyacrylic Acid Binder Neutralization Degree on the Initial Electrochemical Behavior of a Silicon/Graphite Electrode.

ACS Appl Mater Interfaces 2021 Jun 8. Epub 2021 Jun 8.

Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, Nantes F-44000, France.

The role of the physicochemical properties of the water-soluble polyacrylic acid (PAA) binder in the electrochemical performance of highly loaded silicon/graphite 50/50 wt % negative electrodes has been examined as a function of the neutralization degree in PAAHLi at the initial cycle in an electrolyte not containing ethylene carbonate. Electrode processing in the acidic PAAH binder at pH 2.5 leads to a deep copper corrosion, resulting in a significant electrode cohesion and adhesion to the current collector surface, but the strong binder rigidity may explain the big cracks occurring on the electrode surface at the first cycle. Read More

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Modeling and Fabrication of Silk Fibroin-Gelatin-Based Constructs Using Extrusion-Based Three-Dimensional Bioprinting.

ACS Biomater Sci Eng 2021 Jun 8. Epub 2021 Jun 8.

IRCCS Istituto Ortopedico Rizzoli, SC Laboratorio di Immunoreumatologia e Rigenerazione Tissutale, Via di Barbiano 1/10, 40136 Bologna, Italy.

Robotic dispensing-based 3D bioprinting represents one of the most powerful technologies to develop hydrogel-based 3D constructs with enormous potential in the field of regenerative medicine. The optimization of hydrogel printing parameters, proper geometry and internal architecture of the constructs, and good cell viability during the bioprinting process are the essential requirements. In this paper, an analytical model based on the hydrogel rheological properties was developed to predict the extruded filament width in order to maximize the printed structure's fidelity to the design. Read More

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Assessment of tomato-based thick fluid diet for patients with dysphagia using a simple and cheap test.

J Texture Stud 2021 Jun 7. Epub 2021 Jun 7.

Department of Food Science and Technology, Federal University of Santa Catarina, Florianópolis, Brazil.

Swallowing difficulty, also known as dysphagia, is a health condition that can be managed by different approaches, such as changing the viscosity of fluid foods with thickener agents. Tomato-based beverages such as "gazpacho" and "salmorejo" are common foods much appreciated by the populations that adopt a Mediterranean diet, mainly in Spain. These beverages usually present a low viscosity, challenging to include in diets for dysphagia patients. Read More

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Protein Adsorption Enhances Energy Dissipation in Networks of Lysozyme Amyloid Fibrils.

Langmuir 2021 Jun 7. Epub 2021 Jun 7.

Nanobiophysics, Faculty of Science and Technology, Mesa+ Institute for Nanotechnology, University of Twente, Enschede, 7500 AE, The Netherlands.

Hydrogels of amyloid fibrils are a versatile biomaterial for tissue engineering and other biomedical applications. Their suitability for these applications has been partly ascribed to their excellent and potentially engineerable rheological properties. However, while in biomedical applications the gels have to function in compositionally complex physiological solutions, their rheological behavior is typically only characterized in simple buffers. Read More

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Synergistic Effect of Polyaspartate and Polyethylene Glycol on Lubrication Performance of the Water-Based Drilling Mud.

ACS Omega 2021 Jun 21;6(21):13817-13830. Epub 2021 May 21.

JiahuaKeji Co., Let., Jingzhou 434000, China.

The poor lubrication performance of water-based drilling mud hinders its application in the drilling process of extended, reach horizontal wells. To overcome this shortcoming, polyaspartate (PA) and poly(ethylene glycol) (PEG) were used to improve the lubrication performance of the water-based drilling mud. The conventional performances, lubrication performance, and micro-image of antiwear steel balls of the modified water-based drilling mud were analyzed. Read More

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Impact of wheat globulin addition on dough rheological properties and quality of cooked noodles.

Food Chem 2021 May 21;362:130170. Epub 2021 May 21.

College of Food Science and Engineer, Henan University of Technology, Zhengzhou, Henan 450001, China. Electronic address:

Impact of globulin addition on the functional and protein structural properties of dough and cooked noodles were investigated. The underlying mechanism was explored through analyzing the interaction between globulin and gluten by using SDS-PAGE, size exclusion chromatography, free sulfhydryl/disulfide bond analysis, laser scanning confocal microscopy and Fourier transform infrared spectroscopy. Results showed that the stiffness/hardness and maximum resistance of dough and cooked noodles were both increased when globulin addition was 1. Read More

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Rheological properties of cellulosic thickeners in hydro-alcoholic media: The science behind the formulation of hand sanitizer gels.

Int J Pharm 2021 Jun 3;604:120769. Epub 2021 Jun 3.

School of Pharmacy, University of Camerino, Camerino, MC 62032, Italy.

Cellulosic-based thickeners are commonly used in the preparation of hydro-alcoholic hand sanitisers. Yet, little is known about the behaviour of these polymeric dispersions in hydro-alcoholic mixtures. Here, we studied the dispersion ability and rheology of hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose and sodium carboxymethyl cellulose in water-ethanol mixtures. Read More

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