The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
J Carrilloahumada - One of the best experts on this subject based on the ideXlab platform.
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multi objective optimization of process conditions in the manufacturing of banana musa paradisiaca l starch natural Rubber Films
Carbohydrate Polymers, 2017Co-Authors: A Ramirezhernandez, A Apariciosaguilan, Gilberto Reynosomeza, J CarrilloahumadaAbstract:Abstract Multi-objective optimization was used to evaluate the effect of adding banana (Musa paradisiaca L.) starch and natural Rubber (cis-1,4-poliisopreno) at different ratios (1–13 w/w) to the manufacturing process of biodegradable Films, specifically the effect on the biodegradability, crystallinity and moisture of the Films. A structural characterization of the Films was performed by X-ray diffraction, Fourier transform infrared spectroscopy and SEM, moisture and biodegradability properties were studied. The models obtained showed that degradability vs. moisture tend to be inversely proportional and crystallinity vs. degradability tend to be directly proportional. With respect to crystallinity vs. moisture behavior, it is observed that crystallinity remains constant when moisture values remain between 27 and 41%. Beyond this value there is an exponential increase in crystallinity. These results allow for predictions on the mechanical behavior that can occur in starch/Rubber Films.
Steven P Schwendeman - One of the best experts on this subject based on the ideXlab platform.
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feedback controlled photolytic gas phase nitric oxide delivery from s nitrosothiol doped silicone Rubber Films
Journal of Controlled Release, 2020Co-Authors: Gergely Lautner, Blake Stringer, Mark E Meyerhoff, Orsolya Lautnercsorba, Steven P SchwendemanAbstract:Abstract Constant therapeutic gas phase nitric oxide (NO) delivery is achieved from S-nitrosothiol (RSNO) type NO donor doped silicone Rubber Films using feedback-controlled photolysis. For photo-release of the NO gas, the intensity of the LED light source is controlled via a PID (proportional–integral–derivative) controller implemented on a microcontroller. The NO concentration within the emitted gas phase is monitored continuously with a commercial amperometric NO gas sensor. NO release was accurately adjustable up to 10 ppm across a broad range of setpoints with response times of roughly 1 min or less. When NO is generated into an air recipient stream, lower NO yields and a comparable level of toxic nitrogen dioxide (NO2) formation is observed. However, NO gas generated into an N2 recipient gas stream can be blended into pure O2 with very low NO2 formation. Following scale-up, this technology could be used for point-of-care gas phase NO generation as an alternative for currently used gas cylinder technology for treatment of health conditions where inhaled NO is beneficial, such as pulmonary hypertension, hypoxemia, and cystic fibrosis.
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controlled light induced gas phase nitric oxide release from s nitrosothiol doped silicone Rubber Films
Nitric Oxide, 2019Co-Authors: Gergely Lautner, Blake Stringer, Elizabeth J Brisbois, Mark E Meyerhoff, Steven P SchwendemanAbstract:Abstract The light induced nitric oxide (NO) release properties of S-nitroso-N-acetylpenicillamine (SNAP) and S-nitrosoglutathione (GSNO) NO donors doped within polydimethylsiloxane (PDMS) Films (PDMS-SNAP and PDMS-GSNO respectively) for potential inhaled NO (iNO) applications is examined. To achieve photolytic release of gas phase NO from the PDMS-SNAP and PDMS-GSNO Films, narrow-band LED light sources are employed and the NO concentration in a N2 sweep gas above the film is monitored with an electrochemical NO sensor. The NO release kinetics using LED sources with different nominal wavelengths and optical power densities are reported. The effect of the NO donor loading within the PDMS Films is also examined. The NO release levels can be controlled by the LED triggered release from the NO donor-doped silicone Rubber Films in order to generate therapeutic levels in a sweep gas for suitable durations potentially useful for iNO therapy. Hence this work may lay the groundwork for future development of a highly portable iNO system for treatment of patients with pulmonary hypertension, hypoxemia, and cystic fibrosis.
Yuchuan Su - One of the best experts on this subject based on the ideXlab platform.
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piezoelectric Rubber Films for autonomous physiological monitoring systems
Sensors and Actuators A-physical, 2014Co-Authors: Juiwei Tsai, Jhihjhe Wang, Yuchuan SuAbstract:Abstract We have successfully demonstrated the fabrication of piezoelectric Rubber Films and their applications in heartbeat sensing and human energy harvesting. To realize the desired stretchability and electromechanical sensitivity, cellular polydimethylsiloxane (PDMS) structures with micrometer-sized voids are internally implanted with bipolar charges, which function as dipoles and respond promptly to diverse electromechanical stimuli. The resulting composite structures behave like Rubber (with an elastic modulus about 300 kPa) and show strong piezoelectricity (with a piezoelectric coefficient d33 higher than 1500 pC/N). In the prototype demonstration, an autonomous heartbeat monitoring system utilizing stacked piezoelectric PDMS Films is demonstrated. While integrated with a 12-μA h solid-state energy storage device and a 552-nW nano-power charge amplifier, the energy harvested from human body is stored and employed to monitor heartbeat. With a working area of 10 cm2 and a compressive load of 10 kg, it is estimated that a charge of 0.1 μC/cycle can be collected using a single-layered piezoelectric Rubber film. Furthermore, multiple layers can be stacked and connected in parallel to magnify the charge output. As such, the demonstrated piezoelectric Rubber Films, which function as both stretchable energy harvesters and highly-sensitive impact sensors, possess a great potential for the realization of wearable and implantable human physiological monitoring systems.
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piezoelectric Rubber Films for highly sensitive impact measurement
Journal of Micromechanics and Microengineering, 2013Co-Authors: Jhihjhe Wang, Juiwei Tsai, Yuchuan SuAbstract:We have successfully demonstrated the microfabrication of piezoelectric Rubber Films and their application in impact measurement. To realize the desired piezoelectricity and stretchability, cellular polydimethylsiloxane (PDMS) structures with micrometer-sized voids are internally implanted with bipolar charges, which function as dipoles and respond promptly to electromechanical stimuli. In the prototype demonstration, 300 µm thick cellular PDMS Films are fabricated and internally coated with a thin polytetrafluoroethylene (PTFE) layer to secure the implanted charges. Meanwhile, the top and bottom surfaces of the cellular PDMS Films are deposited with stretchable gold electrodes. An electric field up to 35 MV m−1 is applied across the gold electrodes to ionize the air in the voids and to implant charges on the inner surfaces. The resulting composite structures behave like Rubber (with an elastic modulus of about 300 kPa) and show strong piezoelectricity (with a piezoelectric coefficient d33 higher than 1000 pC N−1). While integrated with a wide bandwidth and large dynamic-range charge amplifier, highly sensitive impact measurement (with a stress sensitivity of about 10 mV Pa−1) is demonstrated. As such, the demonstrated piezoelectric Rubber Films could potentially serve as a sensitive electromechanical material for low-frequency stimuli, and fulfill the needs of a variety of physiological monitoring and wearable electronics applications.
A Ramirezhernandez - One of the best experts on this subject based on the ideXlab platform.
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multi objective optimization of process conditions in the manufacturing of banana musa paradisiaca l starch natural Rubber Films
Carbohydrate Polymers, 2017Co-Authors: A Ramirezhernandez, A Apariciosaguilan, Gilberto Reynosomeza, J CarrilloahumadaAbstract:Abstract Multi-objective optimization was used to evaluate the effect of adding banana (Musa paradisiaca L.) starch and natural Rubber (cis-1,4-poliisopreno) at different ratios (1–13 w/w) to the manufacturing process of biodegradable Films, specifically the effect on the biodegradability, crystallinity and moisture of the Films. A structural characterization of the Films was performed by X-ray diffraction, Fourier transform infrared spectroscopy and SEM, moisture and biodegradability properties were studied. The models obtained showed that degradability vs. moisture tend to be inversely proportional and crystallinity vs. degradability tend to be directly proportional. With respect to crystallinity vs. moisture behavior, it is observed that crystallinity remains constant when moisture values remain between 27 and 41%. Beyond this value there is an exponential increase in crystallinity. These results allow for predictions on the mechanical behavior that can occur in starch/Rubber Films.
Gergely Lautner - One of the best experts on this subject based on the ideXlab platform.
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feedback controlled photolytic gas phase nitric oxide delivery from s nitrosothiol doped silicone Rubber Films
Journal of Controlled Release, 2020Co-Authors: Gergely Lautner, Blake Stringer, Mark E Meyerhoff, Orsolya Lautnercsorba, Steven P SchwendemanAbstract:Abstract Constant therapeutic gas phase nitric oxide (NO) delivery is achieved from S-nitrosothiol (RSNO) type NO donor doped silicone Rubber Films using feedback-controlled photolysis. For photo-release of the NO gas, the intensity of the LED light source is controlled via a PID (proportional–integral–derivative) controller implemented on a microcontroller. The NO concentration within the emitted gas phase is monitored continuously with a commercial amperometric NO gas sensor. NO release was accurately adjustable up to 10 ppm across a broad range of setpoints with response times of roughly 1 min or less. When NO is generated into an air recipient stream, lower NO yields and a comparable level of toxic nitrogen dioxide (NO2) formation is observed. However, NO gas generated into an N2 recipient gas stream can be blended into pure O2 with very low NO2 formation. Following scale-up, this technology could be used for point-of-care gas phase NO generation as an alternative for currently used gas cylinder technology for treatment of health conditions where inhaled NO is beneficial, such as pulmonary hypertension, hypoxemia, and cystic fibrosis.
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controlled light induced gas phase nitric oxide release from s nitrosothiol doped silicone Rubber Films
Nitric Oxide, 2019Co-Authors: Gergely Lautner, Blake Stringer, Elizabeth J Brisbois, Mark E Meyerhoff, Steven P SchwendemanAbstract:Abstract The light induced nitric oxide (NO) release properties of S-nitroso-N-acetylpenicillamine (SNAP) and S-nitrosoglutathione (GSNO) NO donors doped within polydimethylsiloxane (PDMS) Films (PDMS-SNAP and PDMS-GSNO respectively) for potential inhaled NO (iNO) applications is examined. To achieve photolytic release of gas phase NO from the PDMS-SNAP and PDMS-GSNO Films, narrow-band LED light sources are employed and the NO concentration in a N2 sweep gas above the film is monitored with an electrochemical NO sensor. The NO release kinetics using LED sources with different nominal wavelengths and optical power densities are reported. The effect of the NO donor loading within the PDMS Films is also examined. The NO release levels can be controlled by the LED triggered release from the NO donor-doped silicone Rubber Films in order to generate therapeutic levels in a sweep gas for suitable durations potentially useful for iNO therapy. Hence this work may lay the groundwork for future development of a highly portable iNO system for treatment of patients with pulmonary hypertension, hypoxemia, and cystic fibrosis.
