scholarly journals Characterization of Polydioxanone in Near-Field Electrospinning

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
William E. King ◽  
Yvonne Gillespie ◽  
Keaton Gilbert ◽  
Gary L. Bowlin
Keyword(s):  
Applied Voltage ◽  
Biomedical Applications ◽  
Near Field ◽  
Deposition Velocity ◽  
Polymer Concentration ◽  
Air Gap ◽  
Translational Velocity ◽  
Individual Fiber ◽  
The Creation ◽  
Fiber Deposition

Electrospinning is a popular method for creating random, non-woven fibrous templates for biomedical applications, and a subtype technique termed near-field electrospinning (NFES) was devised by reducing the air gap distance to millimeters. This decreased working distance paired with precise translational motion between the fiber source and collector allows for the direct writing of fibers. We demonstrate a near-field electrospinning device designed from a MakerFarm Prusa i3v three-dimensional (3D) printer to write polydioxanone (PDO) microfibers. PDO fiber diameters were characterized over the processing parameters: Air gap, polymer concentration, translational velocity, needle gauge, and applied voltage. Fiber crystallinity and individual fiber uniformity were evaluated for the polymer concentration and translational fiber deposition velocity. Fiber stacking was evaluated for the creation of 3D templates to guide the alignment of human gingival fibroblasts. The fiber diameters correlated positively with polymer concentration, applied voltage, and needle gauge; and inversely correlated with translational velocity and air gap distance. Individual fiber diameter variability decreases, and crystallinity increases with increasing translational fiber deposition velocity. These data resulted in the creation of tailored PDO 3D templates, which guided the alignment of primary human fibroblast cells. Together, these results suggest that NFES of PDO can be scaled to create precise geometries with tailored fiber diameters for biomedical applications.

scholarly journals Near-Field Electrospinning and Melt Electrowriting of Biomedical Polymers—Progress and Limitations

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1097
Author(s):  
William E. King ◽  
Gary L. Bowlin
Keyword(s):  
Electric Field ◽  
Relative Motion ◽  
Biomedical Applications ◽  
Near Field ◽  
Biomedical Polymers ◽  
The Creation

Near-field electrospinning (NFES) and melt electrowriting (MEW) are the process of extruding a fiber due to the force exerted by an electric field and collecting the fiber before bending instabilities occur. When paired with precise relative motion between the polymer source and the collector, a fiber can be directly written as dictated by preprogrammed geometry. As a result, this precise fiber control results in another dimension of scaffold tailorability for biomedical applications. In this review, biomedically relevant polymers that to date have manufactured fibers by NFES/MEW are explored and the present limitations in direct fiber writing of standardization in published setup details, fiber write throughput, and increased ease in the creation of complex scaffold geometries are discussed.

scholarly journals Near-Field Communication in Biomedical Applications

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 703
Author(s):  
Sung-Gu Kang ◽  
Min-Su Song ◽  
Joon-Woo Kim ◽  
Jung Woo Lee ◽  
Jeonghyun Kim
Keyword(s):  
Blood Flow ◽  
Communication Technology ◽  
Biomedical Applications ◽  
Daily Life ◽  
Near Field ◽  
Near Field Communication ◽  
Disease Monitoring ◽  
Payment Methods ◽  
New Sensors ◽  
Biomedical Fields

Near-field communication (NFC) is a low-power wireless communication technology used in contemporary daily life. This technology contributes not only to user identification and payment methods, but also to various biomedical fields such as healthcare and disease monitoring. This paper focuses on biomedical applications among the diverse applications of NFC. It addresses the benefits of combining traditional and new sensors (temperature, pressure, electrophysiology, blood flow, sweat, etc.) with NFC technology. Specifically, this report describes how NFC technology, which is simply applied in everyday life, can be combined with sensors to present vision and opportunities to modern people.

Application of Soft Computing Techniques in Power Engineering

2016 ◽  
pp. 354-364
Author(s):  
Vivek Venkobarao
Keyword(s):  
Induction Motor ◽  
Prior Knowledge ◽  
Soft Computing ◽  
Applied Voltage ◽  
Air Gap ◽  
Switching Frequency ◽  
Submersible Pump ◽  
Motor Speed ◽  
Soft Computing Techniques ◽  
Voltage Frequency

A discharge estimator is designed and analyzed in this chapter to estimate the discharge with voltage, frequency and current without prior knowledge of head. A control of discharge in submersible pump is achieved by varying the motor speed. In VSI fed induction motor the speed is varied by varying the switching frequency. The ratio of frequency to the applied voltage is maintained constant, to keep the air gap flux at a desired value. The development of discharge estimator, PID and Fuzzy controllers are discussed in this chapter.

scholarly journals A Literature Survey on Wireless Power Transfer for Biomedical Devices

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Reem Shadid ◽  
Sima Noghanian
Keyword(s):  
Biomedical Applications ◽  
Recent Literature ◽  
Near Field ◽  
Wireless Power Transfer ◽  
Literature Survey ◽  
System Model ◽  
Biomedical Devices ◽  
Power Transfer ◽  
Wireless Power ◽  
Electrocardiogram Ecg

This paper provides a review and survey of research on power transfer for biomedical applications based on inductive coupling. There is interest in wireless power transfer (WPT) for implantable and wearable biomedical devices, for example, heart pacemaker or implantable electrocardiogram (ECG) recorders. This paper concentrates on the applications based on near-field power transfer methods, summarizes the main design features in the recent literature, and provides some information about the system model and coil optimization.

scholarly journals Morphology andIn VitroBehavior of Electrospun Fibrous Poly(D,L-lactic acid) for Biomedical Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Toshihiro Inami ◽  
Yasuhiro Tanimoto ◽  
Masayuki Ueda ◽  
Yo Shibata ◽  
Satoshi Hirayama ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Biomedical Applications ◽  
Polymer Concentration ◽  
The Body ◽  
Solution Flow Rate ◽  
Apatite Formation ◽  
X Ray Diffraction ◽  
Solution Flow

This work describes the fabrication, optimization, and characterization of electrospun fibrous poly(D,L-lactic acid) (PDLLA) for biomedical applications. The influences of the polymer concentration of the electrospinning solution (5, 10, or 15 wt%) and the solution flow rate (0.1, 0.5, 1.0, or 2.0 mL/h) on the morphology of the obtained fibrous PDLLA were evaluated. Thein vitrobiocompatibility of two types of PDLLA, ester terminated PDLLA (PDLLA-R) and carboxyl terminated PDLLA (PDLLA-COOH), was evaluated by monitoring apatite formation on samples immersed in Hanks’ balanced salt (HBS) solution. 15 wt% polymer solution was the most beneficial for preparing a fibrous PDLLA structure. Meanwhile, no differences in morphology were observed for PDLLA prepared at various flow rates. Apatite precipitate is formed on both types of PDLLA only 1 day after immersion in HBS solution. After 7 days of immersion, PDLLA-COOH showed greater apatite formation ability compared with that of PDLLA-R, as measured by thin-film X-ray diffraction. The results indicated that the carboxyl group is effective for apatite precipitation in the body environment.

The influence of polymer concentration, applied voltage, modulation depth and pulse frequency on DNA separation by pulsed field CE

2010 ◽  
Vol 33 (17-18) ◽  
pp. 2811-2817 ◽  
Author(s):  
Zhenqing Li ◽  
Xiaoming Dou ◽  
Yi Ni ◽  
Keiko Sumitomo ◽  
Yoshinori Yamaguchi
Keyword(s):  
Applied Voltage ◽  
Modulation Depth ◽  
Polymer Concentration ◽  
Pulse Frequency ◽  
Dna Separation ◽  
Pulsed Field
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