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Satyavrata Samavedi - One of the best experts on this subject based on the ideXlab platform.

  • coupling between voltage and tip to Collector Distance in polymer electrospinning insights from analysis of regimes transitions and cone jet features
    Chemical Engineering Science, 2021
    Co-Authors: Nikhita Joy, R. Anuraj, Amartya Viravalli, Harish N. Dixit, Satyavrata Samavedi
    Abstract:

    Abstract In this study, we shed light on the coupling between voltage (V) and tip-to-Collector Distance (T) in polymer electrospinning. First, an operating map in the V-T plane – with the potential to facilitate real-time control – reveals four electrospinning regimes including a newly identified rotational regime that serves as a transition from the cone-jet to the multi-jet regime. Next, across experiments in which V and T are independently varied, we image and comprehensively investigate regime-specific cone and jet dynamics using quantifiable and universally recognizable features. Our results demonstrate for the first time that theoretical potential drop (V/T) ─ although crucial in determining electrospinning outcomes ─ is not a fundamental V-T coupling parameter. Further, the nature of coupling is shown to dynamically vary with specific V and T combinations, with correlations indicating stronger dependence of cone/jet features on V than on T. Significantly, small changes to the Collector position orchestrates regime transitions at the needle tip despite the large separation Distance, although the effects of V dominate at large T values. Supporting simulations implicate the combined roles of effective field strength, charge density and field line distribution near the cone apex as critical factors influencing V-T coupling.

  • Coupling between voltage and tip-to-Collector Distance in polymer electrospinning: insights from analysis of regimes, transitions and cone/jet features
    Chemical Engineering Science, 2021
    Co-Authors: Nikhita Joy, R. Anuraj, Amartya Viravalli, Harish N. Dixit, Satyavrata Samavedi
    Abstract:

    Abstract In this study, we shed light on the coupling between voltage (V) and tip-to-Collector Distance (T) in polymer electrospinning. First, an operating map in the V-T plane– with the potential to facilitate real-time control – reveals four electrospinning regimes including a newly identified rotational regime. Next, across experiments in which V and T are independently varied, we image and investigate regime-specific cone/jet dynamics using six quantifiable features. Our results demonstrate for the first time that potential drop (V/T) ─ although crucial in determining electrospinning outcomes─ is not a fundamental V-T coupling parameter. Further, the nature of coupling is shown to dynamically vary with specific V-T combinations. Significantly, small changes to the Collector position orchestrates regime transitions at the needle tip despite the large separation Distance. Supporting simulations implicate the roles of effective field strength, charge density and field line distribution near the cone apex as critical factors influencing V-T coupling.

Nikhita Joy - One of the best experts on this subject based on the ideXlab platform.

  • coupling between voltage and tip to Collector Distance in polymer electrospinning insights from analysis of regimes transitions and cone jet features
    Chemical Engineering Science, 2021
    Co-Authors: Nikhita Joy, R. Anuraj, Amartya Viravalli, Harish N. Dixit, Satyavrata Samavedi
    Abstract:

    Abstract In this study, we shed light on the coupling between voltage (V) and tip-to-Collector Distance (T) in polymer electrospinning. First, an operating map in the V-T plane – with the potential to facilitate real-time control – reveals four electrospinning regimes including a newly identified rotational regime that serves as a transition from the cone-jet to the multi-jet regime. Next, across experiments in which V and T are independently varied, we image and comprehensively investigate regime-specific cone and jet dynamics using quantifiable and universally recognizable features. Our results demonstrate for the first time that theoretical potential drop (V/T) ─ although crucial in determining electrospinning outcomes ─ is not a fundamental V-T coupling parameter. Further, the nature of coupling is shown to dynamically vary with specific V and T combinations, with correlations indicating stronger dependence of cone/jet features on V than on T. Significantly, small changes to the Collector position orchestrates regime transitions at the needle tip despite the large separation Distance, although the effects of V dominate at large T values. Supporting simulations implicate the combined roles of effective field strength, charge density and field line distribution near the cone apex as critical factors influencing V-T coupling.

  • Coupling between voltage and tip-to-Collector Distance in polymer electrospinning: insights from analysis of regimes, transitions and cone/jet features
    Chemical Engineering Science, 2021
    Co-Authors: Nikhita Joy, R. Anuraj, Amartya Viravalli, Harish N. Dixit, Satyavrata Samavedi
    Abstract:

    Abstract In this study, we shed light on the coupling between voltage (V) and tip-to-Collector Distance (T) in polymer electrospinning. First, an operating map in the V-T plane– with the potential to facilitate real-time control – reveals four electrospinning regimes including a newly identified rotational regime. Next, across experiments in which V and T are independently varied, we image and investigate regime-specific cone/jet dynamics using six quantifiable features. Our results demonstrate for the first time that potential drop (V/T) ─ although crucial in determining electrospinning outcomes─ is not a fundamental V-T coupling parameter. Further, the nature of coupling is shown to dynamically vary with specific V-T combinations. Significantly, small changes to the Collector position orchestrates regime transitions at the needle tip despite the large separation Distance. Supporting simulations implicate the roles of effective field strength, charge density and field line distribution near the cone apex as critical factors influencing V-T coupling.

Komeil Nasouri - One of the best experts on this subject based on the ideXlab platform.

  • Novel estimation of morphological behavior of electrospun nanofibers with artificial intelligence system (AIS)
    Polymer Testing, 2018
    Co-Authors: Komeil Nasouri
    Abstract:

    Abstract Electrospun nanofibers could be used as various high-performance devices to evaluate the new applications. Computational program design along with experimental achievements is needed for progress of nanofibers synthesis. In this study, artificial intelligence system (AIS) model has been used to study the morphological properties of electrospun nanofibers based on empirical data. For program designing, first, the most significant parameters including polymer concentration, voltage, and needle-to-Collector Distance on morphological properties of the electrospun nanofibers are determined, second, various AIS models are developed for prediction of morphology of electrospun nanofibers, and third, by comparing predictive validity of the developed AIS models and observed correlation, the best model is selected. The optimized AIS model with three input parameters, five neurons in first layer with tangent sigmoid transfer function, and one neuron in the second layer with linear transfer function was obtained. This model was able to predict the considered coefficient with R2 = 0.981. The AIS analysis established that concentration of electrospinning solution and needle-to-Collector Distance were the main significant parameters altering the electrospun nanofibers morphology. Based on our best knowledge, the results of this research show that the optimized intelligence system can evaluate morphological behavior to an excellent level and is in good agreement with the electrospinning data.

  • Comparison between artificial neural network and response surface methodology in the prediction of the production rate of polyacrylonitrile electrospun nanofibers
    Fibers and Polymers, 2013
    Co-Authors: Komeil Nasouri, Ahmad Mousavi Shoushtari, Mehrdad Khamforoush
    Abstract:

    This paper focused on using response surface methodology (RSM) and artificial neural network (ANN) to analyze production rate of electrospun nanofibers. The three important electrospinning factors were studied including polymer concentration (wt %), applied voltage (kV) and the nozzle-Collector Distance (cm). The predicted production rates were in agreement with the experimental results in both ANN and RSM techniques. High regression coefficient between the variables and the response (R2=0.975) indicates excellent evaluation of experimental data by second-order polynomial regression model. The regression coefficient was 0.988, which indicates that the ANN model was shows good fitting with experimental data. The obtained results indicate that the performance of ANN was better than RSM. It was concluded that applied voltage plays an important role (relative importance of 42.8 %) against production rate of electrospun nanofibers. The RSM model predicted the 2802.3 m/min value of the highest production rate at conditions of 15 wt % polymer concentration, 16 kV of the applied voltage, and 15 cm of nozzle-Collector Distance. The predicted value showed only 4.4 % difference with experimental results in which 2931.0 m/min at the same setting was observed.

  • RSM and ANN approaches for modeling and optimizing of electrospun polyurethane nanofibers morphology
    Fibers and Polymers, 2012
    Co-Authors: Amir Rabbi, Komeil Nasouri, Hossein Bahrambeygi, Ahmad Mousavi Shoushtari, Mohammad Reza Babaei
    Abstract:

    This paper focused on using response surface methodology (RSM) and artificial neural network (ANN) to analyze polyurethane (PU) nanofibers morphology synthesized by electrospinning. The process was characterized in detail by using experimental design to determine the parameters that may affect the nanofibers morphology such as polymer concentration, a tip to Collector Distance and applied voltage. It was concluded that solution concentration plays an important role (relative importance of 79.85 %) against nanofibers diameter and its standard deviation. Based on the results, applied voltage has a different effect on the nanofiber diameter at low and high solution concentrations. Moreover, the tip to Collector Distance parameter has no significant impact on the average nanofiber diameter. The finest PU nanofiber (201 nm) was obtained from experimental under conditions of: 9 w/v% polymer concentrations, 12 cm tip to Collector Distance and 16 kV applied voltage. The results show a very good agreement between the experimental and modeled data. It was demonstrated that both models (specially, in case of neural network) are excellent for predicting diameter of PU nanofibers. Furthermore, numerical optimization has been performed by considering desirability function to access the region in design space that introduces minimum average diameter.

Yusuf Z. Menceloğlu - One of the best experts on this subject based on the ideXlab platform.

  • Effects of electrospinning parameters on polyacrylonitrile nanofiber diameter: An investigation by response surface methodology
    Materials & Design, 2008
    Co-Authors: O.s. Yördem, Melih Papila, Yusuf Z. Menceloğlu
    Abstract:

    Effects of material and process parameters on the diameter of electrospun polyacrylonitrile fibers were experimentally investigated. Response surface methodology (RSM) was utilized to design the experiments at the settings of solution concentration, voltage and the Collector Distance. It also imparted the evaluation of the significance of each parameter on the resultant fiber diameter. The investigations were carried out in the two-variable process domains of several Collector Distances as applied voltage and the solution concentration were varied at a fixed polymer molecular weight. The mean diameter and coefficient of variation were modeled by polynomial response surfaces as functions of solution concentration and voltage at each Collector Distance. Effect of applied voltage in micron-scale fiber diameter was observed to be almost negligible when solution concentration and Collector Distance were high. However, all three factors were found statistically significant in the production of nano-scale fibers. The response surface predictions revealed the parameter interactions for the resultant fiber diameter, and showed that there is a negative correlation between the mean diameter and coefficient of variation for the fiber diameter. A sub-domain of the parameter space consisting of the solution concentration, applied voltage and Collector Distance, was suggested for the potential nano-scale fiber production.

R. Anuraj - One of the best experts on this subject based on the ideXlab platform.

  • coupling between voltage and tip to Collector Distance in polymer electrospinning insights from analysis of regimes transitions and cone jet features
    Chemical Engineering Science, 2021
    Co-Authors: Nikhita Joy, R. Anuraj, Amartya Viravalli, Harish N. Dixit, Satyavrata Samavedi
    Abstract:

    Abstract In this study, we shed light on the coupling between voltage (V) and tip-to-Collector Distance (T) in polymer electrospinning. First, an operating map in the V-T plane – with the potential to facilitate real-time control – reveals four electrospinning regimes including a newly identified rotational regime that serves as a transition from the cone-jet to the multi-jet regime. Next, across experiments in which V and T are independently varied, we image and comprehensively investigate regime-specific cone and jet dynamics using quantifiable and universally recognizable features. Our results demonstrate for the first time that theoretical potential drop (V/T) ─ although crucial in determining electrospinning outcomes ─ is not a fundamental V-T coupling parameter. Further, the nature of coupling is shown to dynamically vary with specific V and T combinations, with correlations indicating stronger dependence of cone/jet features on V than on T. Significantly, small changes to the Collector position orchestrates regime transitions at the needle tip despite the large separation Distance, although the effects of V dominate at large T values. Supporting simulations implicate the combined roles of effective field strength, charge density and field line distribution near the cone apex as critical factors influencing V-T coupling.

  • Coupling between voltage and tip-to-Collector Distance in polymer electrospinning: insights from analysis of regimes, transitions and cone/jet features
    Chemical Engineering Science, 2021
    Co-Authors: Nikhita Joy, R. Anuraj, Amartya Viravalli, Harish N. Dixit, Satyavrata Samavedi
    Abstract:

    Abstract In this study, we shed light on the coupling between voltage (V) and tip-to-Collector Distance (T) in polymer electrospinning. First, an operating map in the V-T plane– with the potential to facilitate real-time control – reveals four electrospinning regimes including a newly identified rotational regime. Next, across experiments in which V and T are independently varied, we image and investigate regime-specific cone/jet dynamics using six quantifiable features. Our results demonstrate for the first time that potential drop (V/T) ─ although crucial in determining electrospinning outcomes─ is not a fundamental V-T coupling parameter. Further, the nature of coupling is shown to dynamically vary with specific V-T combinations. Significantly, small changes to the Collector position orchestrates regime transitions at the needle tip despite the large separation Distance. Supporting simulations implicate the roles of effective field strength, charge density and field line distribution near the cone apex as critical factors influencing V-T coupling.