scholarly journals The Design and Implementation of a Disk Electrospinning Device

2020 ◽  
Vol 13 (1) ◽  
pp. 72-76
Author(s):  
Norbert Hodgyai ◽  
Rudolf László Farmos ◽  
Attila Gergely
Keyword(s):  
Fiber Diameter ◽  
Polymer Fibers ◽  
Average Fiber Diameter ◽  
Flexible Design ◽  
Small Solution ◽  
High Productivity ◽  
Design And Implementation ◽  
Major Shortcoming ◽  
Solution Surface ◽  
The One

AbstractThe electrospinning procedure is a relatively simple and fast way of producing polymer fibers with diameters in the micrometer range. The one needle setup is commonly used due to its flexible design and effectiveness; however, this procedure has one major shortcoming; it has low productivity. The disk electrospinning design presented here combines the advantages of the corona and needleless electrospinning setups, namely the small solution surface area and high productivity. We used 33 wt% polyvinylpyrrolidone (PVP) solution to produce PVP fibers with the new design. The average fiber diameter of the produced PVP fibers was d = 446±116 nm, which is ~25 % larger compared to fibers produced with the one needle method.

scholarly journals Effects of Electrospinning Solution Properties on Formation of Beads in Tio2 Fibers with PdO Particles

2015 ◽  
Vol 10 (3) ◽  
pp. 155892501501000 ◽  
Author(s):  
Laila Shahreen ◽  
George G. Chase
Keyword(s):  
Electrical Conductivity ◽  
Surface Tension ◽  
Air Pollution ◽  
Fiber Diameter ◽  
Polymer Fibers ◽  
Solution Viscosity ◽  
Solution Properties ◽  
Average Fiber Diameter ◽  
Ceramic Fibers ◽  
Solution Composition

TiO2 fibers with catalytic PdO particles are of interest for use as porous catalytic converters to react NOx and CO to control air pollution. The fibers are first electrospun as template polymer fibers. The template polymer fibers are calcined to form the ceramic fibers. The electrospinning solution composition significantly affects the average fiber diameter and fiber morphologies (beads) which in turn affect the catalyst performance. In this work, solutions containing Polyvinylpyrrolidone (PVP), Titanium (IV) Isopropoxide (TTIP), and Palladium (II) Chloride (PdCl2) were electrospun with the goal of fabricating beadless submicron composite fibers. The fibers were calcined to produce ceramic TiO2 submicron fibers with Palladium oxide (PdO) nanoparticles. To determine the solution recipes that form smooth PdO-TiO2 fibers without beads, fibers were electrospun and evaluated from solutions with varied mass concentrations of PVP and PdCl2 salt. The solution concentrations indirectly influenced the electrospinning performance through solution viscosity, surface tension and electrical conductivity. The ceramic fibers were produced with average diameters in the range of 180–280 nm and with minimal formation of beads when the solution had viscosity in the range of 52 to 80 cP and conductivity in the range of 45–67 μs/cm. It was found that the surface tension of the solutions did not vary significantly and did not strongly affect the formation of beads.

Numerical investigation on a melt-blowing die with internal stabilizers

2019 ◽  
pp. 152808371986693 ◽  
Author(s):  
Changchun Ji ◽  
Yudong Wang ◽  
Yafeng Sun
Keyword(s):  
Average Velocity ◽  
Fiber Diameter ◽  
Measurement Data ◽  
Melt Blowing ◽  
One Dimensional ◽  
Temperature Decay ◽  
Slot Die ◽  
The Common ◽  
The One ◽  
Peak Value

In order to decrease the fiber diameter and reduce the energy consumption in the melt-blowing process, a new slot die with internal stabilizers was designed. Using computational fluid dynamics technology, the new slot die was investigated. In the numerical simulation, the calculation data were validated with the laboratory measurement data. This work shows that the new slot die could increase the average velocity on the centerline of the air-flow field by 6.9%, compared with the common slot die. Simultaneously, the new slot die could decrease the back-flow velocity and the rate of temperature decay in the region close to the die head. The new slot die could reduce the peak value of the turbulent kinetic energy and make the fiber movements more gradual. With the one-dimensional drawing model, it proves that the new slot die has more edge on the decrease of fiber diameter than the common slot die.

scholarly journals Communicating Guideline Recommendations Using Graphic Narrative Versus Text-Based Broadcast Screensavers: Design and Implementation Study (Preprint)

2021 ◽  
Author(s):  
Lauren Sinnenberg ◽  
Craig A Umscheid ◽  
Frances S Shofer ◽  
Damien Leri ◽  
Zachary F Meisel
Keyword(s):  
Clinical Practice ◽  
High Volume ◽  
Suppressive Therapy ◽  
Guideline Recommendation ◽  
Graphic Narrative ◽  
Design And Implementation ◽  
Resident Physicians ◽  
Graphic Narratives ◽  
The One ◽  
The Impact

BACKGROUND The use of graphic narratives, defined as stories that use images for narration, is growing in health communication. OBJECTIVE The aim of this study was to describe the design and implementation of a graphic narrative screensaver (GNS) to communicate a guideline recommendation (ie, avoiding low-value acid suppressive therapy [AST] use in hospital inpatients) and examine the comparative effectiveness of the GNS versus a text-based screensaver (TBS) on clinical practice (ie, low-value AST prescriptions) and clinician recall. METHODS During a 2-year period, the GNS and the TBS were displayed on inpatient clinical workstations. The numbers of new AST prescriptions were examined in the four quarters before, the three quarters during, and the one quarter after screensavers were implemented. Additionally, an electronic survey was sent to resident physicians 1 year after the intervention to assess screensaver recall. RESULTS Designing an aesthetically engaging graphic that could be rapidly understood was critical in the development of the GNS. The odds of receiving an AST prescription on medicine and medicine subspecialty services after the screensavers were implemented were lower for all four quarters (ie, GNS and TBS broadcast together, only TBS broadcast, only GNS broadcast, and no AST screensavers broadcast) compared to the quarter prior to implementation (odds ratio [OR] 0.85, 95% CI 0.78-0.92; OR 0.89, 95% CI 0.82-0.97; OR 0.87, 95% CI 0.80-0.95; and OR 0.81, 95% CI 0.75-0.89, respectively; <i>P</i>&lt;.001 for all comparisons). There were no statistically significant decreases for other high-volume services, such as the surgical services. These declines appear to have begun prior to screensaver implementation. When surveyed about the screensaver content 1 year later, resident physicians recalled both the GNS and TBS (43/70, 61%, vs 54/70, 77%; <i>P</i>=.07) and those who recalled the screensaver were more likely to recall the main message of the GNS compared to the TBS (30/43, 70%, vs 1/54, 2%; <i>P</i>&lt;.001). CONCLUSIONS It is feasible to use a graphic narrative embedded in a broadcast screensaver to communicate a guideline recommendation, but further study is needed to determine the impact of graphic narratives on clinical practice.

Creating Knowledge Society for Economic and Social Growth in Africa

2014 ◽  
pp. 135-154
Author(s):  
Nathaniel O. Agola
Keyword(s):  
Economic Activity ◽  
Knowledge Society ◽  
Economic Transformation ◽  
High Wage ◽  
Economic Activities ◽  
African Countries ◽  
Critical Determinant ◽  
Social Growth ◽  
High Productivity ◽  
The One

Knowledge use in socio-economic activities is a critical determinant of the divide between countries and regions into low-productivity-low-wage and labour intensive socio-economic activity countries on the one hand, and high-wage-high-productivity and technology abundant countries on the other hand. Therefore, it is indisputable that the creation of knowledge society is imperative for African countries. Economic transformation from low-productivity-low-wage and labour intensive socio-economic activity countries to high-wage-high-productivity and technology abundant countries predominantly define the socio-economic policy aspirations of most African countries. However, it has never been very clear what are the fundamental pillars that must be built and constantly reinforced by these countries to transition to knowledge society stage. This chapter first presents an empirical connection and contribution of knowledge to higher productivity in economic activities. The importance of infusion of knowledge into diverse economic activities to ensure higher levels of productivity both at micro and macro levels is therefore demonstrated through quantification attempts that include knowledge as one of the variables in Total Factor Productivity (TFP) equation. This empirical discussion serves to illuminate the place of knowledge in economic transformation. The second part of the chapter presents an incisive exposition of the critical ten pillars of knowledge creation, sharing, and usage that African countries can leverage to transition from economies defined by low productivity to higher levels of productivity. The chapter concludes that it is the improvement in the collective stock of knowledge of the African countries that would determine whether they could make a transition to a high productivity knowledge society.

Designing Interactive Architecture

2011 ◽  
pp. 166-178
Author(s):  
Mikael Wiberg
Keyword(s):  
Participatory Design ◽  
Lessons Learned ◽  
Interactive Systems ◽  
Design And Implementation ◽  
Interactive Architecture ◽  
Interactive Environment ◽  
Geographically Distributed ◽  
The One ◽  
Ongoing Project ◽  
Design Challenges

Interactive architecture bridges in itself two design traditions, i.e. design of interactive systems on the one hand, and architecture as the tradition of designing our built environment on the other hand. This article reports from our ongoing project focused on the design and implementation of an interactive environment for public use. The article describes the project, reviews and outlines the main design challenges as pinpointed in the literature on interactive architecture, and describes the practical challenges identified in this particular project. This article then presents the participatory design approach adopted in this project to overcome these challenges, and describes and analysis the methodological implications from this project. These implications include the lessons learned from the coordination of a geographically distributed design team, “role gliding” as the reinterpretation of the designers as users in the participatory design process, and a shift from communities of practices to mixtures of professions.

scholarly journals One-Step Bark-Like Imitated Polypropylene (PP)/Polycarbonate (PC) Nanofibrous Meltblown Membrane for Efficient Particulate Matter Removal

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1307 ◽  
Author(s):  
Ting-Ting Li ◽  
Xixi Cen ◽  
Hai-Tao Ren ◽  
Fei Sun ◽  
Qi Lin ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Fiber Diameter ◽  
Average Fiber Diameter ◽  
Efficient Removal ◽  
Filtration Performance ◽  
Innovative Method ◽  
High Efficient ◽  
One Step ◽  
The Cost ◽  
Pm Removal

A bark-like imitated polypr opylene (PP)/polycarbonate (PC) nanofibrous membrane was constructed by one-step meltblown technique for efficient particulate matter (PM) removal. The effects of PC content (0%, 1%, 3%, 5%, and 7%) on membrane thermal stability, microscopic characteristics, filtration performance, hydrophilicity, and water vapor transmission were investigated. The results demonstrated that using facile design of incompatibility and viscosity difference between PC and PP polymers decreases average fiber diameter, creating a bark-like groove appearance and increasing surface potential, making a new PP/PC membrane with high filtration performance. The resultant PP/PC membrane had finer average fiber diameter of 0.63 μm, which was nearly 89.41% lower than PP membranes (5.95 μm), and its quality factor (0.036 Pa−1) was nearly 2.12 times than that of PP membranes (0.017 Pa−1) with the die hole diameter of 0.5 mm. This fabrication technique of a special meltblown filter membrane saves the cost of die retrofitting and post-processing, which provides an innovative method for particulate efficient removal of high efficient filters.

Design and Evaluation of Spinneret Module with Line-Type and Multi-Holes of Electro-Spun

2013 ◽  
Vol 311 ◽  
pp. 243-248
Author(s):  
Wei Cheng Chu ◽  
Chin Pan Huang ◽  
Tien Wei Shyr ◽  
Li Chou Chen ◽  
Shu Ping Chiu
Keyword(s):  
Pressure Drop ◽  
Production Line ◽  
Fiber Diameter ◽  
Filtration Efficiency ◽  
Gray Level ◽  
Average Fiber Diameter ◽  
Sampling Area ◽  
Composite Nonwoven ◽  
Line Type

For the wide application in the field of filtration and bio-medicine, the purpose of this study is to design a spinneret module of electro-spun which can produce composite nonwoven with sub-micrometer fiber continually. Applying the principle of melt-blown, a spinneret module with line-type and multi-holes which was assembled with small beads and filtering net, was designed. In order to construct a continual electro-spun production line, a traversal device was designed to control the traverse-motion of spinneret module for the even lapping and a stainless plate was adopted as collecting plate. In condition of 41KV working voltage, 0.3573 mL/min throughput and 42cm CSD (Capillary-Screen-Distance), a continual PEO nonwoven can be produced with average fiber diameter of 576nm and of CV% 13.4%. To a sampling area of 10cm×10cm and basis weight of 7.257 g/m2 electro-spun nonwoven, the CV% of gray level of its image is 2% and its filtration efficiency is up to 91.2% with pressure drop 13.8mm-H20 by TSI 8130 (32LPM, 5% NaCl).

Electrospinning of Regenerated Silk Fibroin/Polybutylene Terephthalate Blended Mats and their Surface Wettability

2012 ◽  
Vol 531-532 ◽  
pp. 531-534
Author(s):  
Yun Qian Cao ◽  
Qin Fei Ke ◽  
Xiang Yu Jin ◽  
Sha Sha Guo
Keyword(s):  
Silk Fibroin ◽  
Fiber Diameter ◽  
Contact Angles ◽  
Surface Wettability ◽  
Electrospun Fibers ◽  
Average Fiber Diameter ◽  
Polybutylene Terephthalate ◽  
Regenerated Silk Fibroin ◽  
Electrospinning Method ◽  
Nanofiber Membranes

In this paper, regenerated silk fibroin/polybutylene terephthalate blended mats were prepared using electrospinning method with different blending ratios. The influence of regenerated silk fibroin/polybutylene terephthalate ratio on the morphology behaviors, fiber diameter and the surface wettability of the blended mats were studied. The morphology of the electrospun fibers were characterized by SEM. The average fiber diameter and its distribution can be obtained from the SEM pictures using software Image J. The average fiber diameter was 280nm to 486nm and it changed with the blending ratio. The contact angles and penetration times were used to characterize the surface wettability of the nanofiber membranes. It was found that with the increase of regenerated silk fibroin amount, the surface contact angles and penetration times decreased, which meant that the wettability was greatly improved.

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