Natural rubber latex: determination and interpretation of flow curves

Corrêa, Harrison Lourenço; Sousa, Atos Alves de; Furtado, Cristina R. G.

doi:10.1590/0104-1428.1947

Cited by 9 publications

(4 citation statements)

References 8 publications

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“…The shear stress increased by increasing the shear rate with a non-linear relationship (shear thinning) [10]. The pseudoplastic flow was usually found in NRL [11] and other natural and synthetic polymers systems [12,13]. Fig.…”

Section: Rheological Propertiesmentioning

confidence: 96%

Development of<i> In Situ</i> Cooling Natural Rubber Film

Chitrattha

Pichayakorn

2022

KEM

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Natural rubber latex (NRL) with the deproteinized process was interesting for cosmetic and transdermal drug delivery systems because of its notable characteristics. The purpose of this study was to develop in situ cooling films from deproteinized natural rubber latex (DNRL). Menthol, camphor, and volatile oils were added into DNRL emulsions for cooling effect and pain relief. The pH, rheological properties, particle size, and zeta potential of emulsions were examined. Then, the time of film-formation, morphology, and mechanical properties of the cooling NRL films were evaluated. The resultant emulsions revealed that their pH was about 5.7 - 6.3. The viscosity was in the range of 1000 – 3000 cps and indicated the pseudoplastic flow. The increasing amount of olive oil reduced the particle size and increased the negatively zeta potential of those emulsions. The film formation time of specimens was about 4.5 - 6.5 mins. The cooling films demonstrated smoothness and homogeneity. The presence of olive oil increased the softness of films. The increasing of oil volume increased the elasticity; however, it decreased the ductility of the films. This in situ cooling DNRL film was also effective forward for the development of a transdermal drug delivery system.

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Section: Rheological Propertiesmentioning

confidence: 96%

Development of<i> In Situ</i> Cooling Natural Rubber Film

Chitrattha

Pichayakorn

2022

KEM

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“…For the fabrication, we used a 2.2 • 10 −3 cm thick natural latex balloon (Pengxiaomei, Modelling Balloons) [24], [25] and a PET-PVC external tube (RS Components, 368-0233) [26]. The external tube's length is 45 cm to match the partially inflated balloon's length, and its internal diameter is 0.126 cm to ensure a tight junction with the balloon.…”

Section: A Pump Design and Fabricationmentioning

confidence: 99%

Bioinspired Soft Bendable Peristaltic Pump Exploiting Ballooning for High Volume Throughput

Costi

Hughes

Biggins

et al. 2022

IEEE Trans. Med. Robot. Bionics

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Interest in bioinspired peristaltic pumps has grown in popularity among the scientific community in the last decade thanks to their extreme flexibility and their intrinsic compliance. In this paper, we propose a soft peristaltic pump exploiting ballooning. Our aim is to promote and propel forward the ballooned region by controlling the air pressure between the balloon and an external flexible containment tube, to achieve a peristaltic pumping motion with a simple design and using only one control signal. This paper describes the implementation of the pump and the inlet-pump-outlet system, provides an analytical model to predict the pump performance, and showcases experimental results. We also implement a computer simulation to further characterize the device. We show that it is possible to achieve high volumetric flow rates, up to 4.4 mL/s, with only a single control signal, paving the way for more flexible and easy to manufacture peristaltic pumps.

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“…For the fabrication, we used a 2.2 • 10 −3 cm thick natural latex balloon (Pengxiaomei, Modelling Balloons) [26], [27] and a PET-PVC external tube (RS Components, 368-0233) [28]. The external tube's length is 45 cm to match the partially inflated balloon's length, and its internal diameter is 0.126 cm to ensure a tight junction with the balloon.…”

Section: A Pump Design and Fabricationmentioning

confidence: 99%

Bioinspired soft bendable peristaltic pump exploiting ballooning for high volume throughput

Costi

Hughes

Iida

2021

2021 20th International Conference on Advanced Robotics (ICAR)

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Interest in bioinspired peristaltic pumps has grown in popularity among the scientific community in the last decade thanks to their extreme flexibility and their intrinsic compliance. In this paper, we propose a soft peristaltic pump exploiting ballooning. Our aim is to promote and propel forward the ballooned region by controlling the air pressure between the balloon and an external flexible containment tube. Thanks to this mechanism, it is possible to achieve a peristaltic pumping motion with a simple design and using only one control signal. In this paper, we describe the implementation of the pump and the inlet-pump-outlet system, provide an analytical model to predict the pump performance, and experimentally test the device. Finally, the proposed pump is directly compared with the state-of-the-art. We show that it is possible to achieve high flow rates, up to 4.5 mL s , with only a single control signal and relying on a much simpler design, paving the way for more flexible and easy to manufacture peristaltic pumps.

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Natural rubber latex: determination and interpretation of flow curves

Cited by 9 publications

References 8 publications

Development of<i> In Situ</i> Cooling Natural Rubber Film

Development of<i> In Situ</i> Cooling Natural Rubber Film

Bioinspired Soft Bendable Peristaltic Pump Exploiting Ballooning for High Volume Throughput

Bioinspired soft bendable peristaltic pump exploiting ballooning for high volume throughput

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