Analysis of the Influence of Sizes of a Vessel with a Liquid on the Readings of Brookfield Viscometer

Mischenko, S. V.; Mordasov, M. M.; Savenkov, A. P.; Sychev, V. A.

doi:10.1007/s11018-020-01784-2

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…Since PB is a liquid with a viscosity below 30 Pa·s at high temperatures, effects arising from the utilization of a container with dimensions smaller than the established standard should be taken into account. In the case of the 3.5 cm internal diameter container, this effect remains contained, offsetting the viscosity measure by less than 3% for spindle 3 and by about 1% for spindle 4 [ 25 ].…”

Section: Results and Discussionmentioning

confidence: 99%

“…In fact, Refs. [ 25 , 26 ] show that it is possible to measure viscosity in containers with less-than-regulated diameters, just introducing a proper correction coefficient for the accuracy of the results. Thus, a smaller vessel in PPCF material, purchased by Filoalfa (Turin, TO, Italy), internal diameter

cm) was manufactured using 3D technology and utilized for all the experiments.…”

Section: Experimental Partmentioning

confidence: 99%

“…By turning the handle located at the rear of the viscometer, it is possible to lower the rotor, submerging it into the substance whose viscosity is under examination. The distance from the end of the spindle to the bottom of the vessel does not affect the measurement results [25]. The sample was deposited inside the cylindrical container through gentle pressure to avoid undue densification.…”

Section: Viscosity Measurementsmentioning

confidence: 99%

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Rheological and Mechanical Characterization of 3D-Printable Solid Propellant Slurry

Zumbo,

Stumpo,

Antonaci

et al. 2024

Polymers

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This study delves into the rheological and mechanical properties of a 3D-printable composite solid propellant with 80% wt solids loading. Polybutadiene is used as a binder with ammonium sulfate, which is added as an inert replacement for the ammonium perchlorate oxidizer. Further additives are introduced to allow for UV curing. An in-house illumination system made of four UV-A LEDs (385 nm) is employed to cure the resulting slurry. Rheological and mechanical tests are conducted to evaluate the viscosity, ultimate tensile strength and strain, and compression behavior. Viscosity tests are performed for both pure resin and complete propellant composition. A viscosity reduction factor is obtained for the tested formulations when pre-heating slurry. Uniaxial tensile and compression tests reveal that the mechanical properties are consistent with previous research. Results emphasize the critical role of temperature and solid loading percentage. Pre-heating resin composites may grant a proper viscosity reduction while keeping mechanical properties in the applicability range. Overall, these findings pave the way for the development of a 3D printer prototype for composite solid propellants.

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Section: Results and Discussionmentioning

confidence: 99%

cm) was manufactured using 3D technology and utilized for all the experiments.…”

Section: Experimental Partmentioning

confidence: 99%

Section: Viscosity Measurementsmentioning

confidence: 99%

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Rheological and Mechanical Characterization of 3D-Printable Solid Propellant Slurry

Zumbo,

Stumpo,

Antonaci

et al. 2024

Polymers

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“…The viscosity of the in situ gelling system at non-physiological condition (pH 5 and temperature 25 o C) and physiological condition (pH 7.4 in simulated salivary fluid and temperature 37 o C) were determined to assess the gelling ability with change in pH and ionic strength, by a Brookfield viscometer (Model DV-III) using Spindle #SC18 at 50 rpm 35…”

Section: Methodsmentioning

confidence: 99%

“…The viscosity of the in situ gelling system at nonphysiological condition (pH 5 and temperature 25 o C) and physiological condition (pH 7.4 in simulated salivary fluid and temperature 37 o C) were determined to assess the gelling ability with change in pH and ionic strength, by a Brookfield viscometer (Model DV-III) using Spindle #SC18 at 50 rpm 35 Syringeability. The syringeability of the in situ gelling system was determined using a local fabricated instrument, which consist of gauge that calculate the force required in N to drive the in situ solution out of the syringe.…”

Section: Determination Of Viscositymentioning

confidence: 99%

Sustained release of azithromycin from lipid liquid-crystalline nanoparticles laden in situ gel for the treatment of periodontitis: In vitro and efficacy study

Zheng

Zhang

2022

J Biomater Appl

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Periodontitis is a chronic inflammatory disease affecting teeth, periodontal ligament and alveolar bone. Current treatment options include surgery or oral antibiotics. Oral dosage forms shows systemic side effects due to frequent dosing and it failed to reach the therapeutic concentration in the periodontal cavity. In this work, a novel in situ gel loaded with azithromycin laden lipid liquid-crystalline nanoparticles (cubosomes) was formulated for effective treatment of periodontitis. Cubosomes were prepared using DL-α-monoolein (MO) and Pluronic®F-127, and characterized for size, zeta potential, shape, and entrapment efficacy. In situ gel laden cubosomes were evaluated for pH, drug content, viscosity, syringeability, mucoadhesive strength, texture profile, gelation temperature, gel strength, in vitro release profile, antimicrobial activity and in vivo efficacy in rat model. Cubosomal size (137–450 nm) and entrapment efficacy (74–88%) increases with increase in the level of MO. The in situ gel-cubosomal batches showed sufficient viscosity (878–956 cp), syringeability (125–150N), mucoadhesive strength (25.7–26.2 dyne/cm2), gelation temperature (34.3–35.3oC), gel strength (45–51 s), and texture profile for periodontal application. The in vitro release profiles showed sustain azithromycin release for 24h from the in situ gel-cubosomal gels compared to 4h from the marketed azithromycin gel. The in vivo studies (alveolar bone loss and histopathology) in rat model confirmed the efficacy of in situ gel to treat periodontitis at low frequency of dosing compared to marketed gel. In conclusion, the study demonstrated the potential of cubosomes to sustain the release of azithromycin from in situ gelling system for effective treatment of periodontitis.

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Model of Viscosity Measurements by Noncontact Aerohydrodynamic Method

Savenkov

Sychev²

2023

Meas Tech

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Analysis of the Influence of Sizes of a Vessel with a Liquid on the Readings of Brookfield Viscometer

Cited by 5 publications

References 6 publications

Rheological and Mechanical Characterization of 3D-Printable Solid Propellant Slurry

Rheological and Mechanical Characterization of 3D-Printable Solid Propellant Slurry

Sustained release of azithromycin from lipid liquid-crystalline nanoparticles laden in situ gel for the treatment of periodontitis: In vitro and efficacy study

Model of Viscosity Measurements by Noncontact Aerohydrodynamic Method

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