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Dissertations / Theses on the topic 'Electrospinning – Research'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Chigome, Samuel, and Samuel Chigome. "Electrospun nanofibers : an alternative sorbent material for solid phase extraction." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1004972.

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The work described in the thesis seeks to lay a foundation for a better understanding of the use of electrospun nanofibers as a sorbent material. Three miniaturised electrospun nanofiber based solid phase extraction devices were fabricated. For the first two, 10 mg of electrospun polystyrene fibers were used as a sorbent bed for a micro column SPE device (8 mm bed height in a 200 μl pipette tip) and a disk (I) SPE device (5 mm 1 mm sorbent bed in a 1000 μl SPE barrel). While for the third, 4.6 mg of electrospun nylon nanofibers were used as a sorbent bed for a disk (II) SPE device, (sorbent bed consisting of 5 5 mm 350 μm stacked disks in a 500 μl SPE barrel). Corticosteroids were employed as model analytes for performance evaluation of the fabricated SPE devices. Quantitative recoveries (45.5-124.29 percent) were achieved for all SPE devices at a loading volume of 100 μl and analyte concentration of 500 ng ml-1. Three mathematical models; the Boltzmann, Weibull five parameter and the Sigmoid three parameter were employed to describe the break through profiles of each of the sorbent beds. The micro column SPE device exhibited a breakthrough volume of 1400 μl, and theoretical plates (7.98-9.1) while disk (I) SPE device exhibited 400-500 μl and 1.39-2.82 respectively. Disk (II) SPE device exhibited a breakthrough volume of 200 μl and theoretical plates 0.38-1.15. It was proposed that the formats of future electrospun nanofiber sorbent based SPE devices will be guided by mechanical strength of the polymer. The study classified electrospun polymer fibers into two as polystyrene type (relatively low mechanical strength) and nylon type (relatively high mechanical strength).

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2

Qaqish, Walid P. "Electrospinning of L-Tyrosine Polyurethane Scaffolds for Gene Delivery." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1416997407.

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3

Batlokwa, Bareki Shima. "Development of molecularly imprinted polymer based solid phase extraction sorbents for the selective cleanup of food and pharmaceutical residue samples." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1004967.

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This thesis presents the development of chlorophyll, cholic acid, aflatoxin B1 molecularly imprinted polymer (MIP) particles and cholic acid MIP nanofibers for application as selective solid phase extraction (SPE) sorbents. The particles were prepared by bulk polymerization and the nanofibers by a novel approach combining molecular imprinting and electrospinning technology. The AFB1 MIP particles were compared with an aflatoxin specific immunoextraction sorbent in cleaning-up and pre-concentrating aflatoxins from nut extracts. They both recorded high extraction efficiencies (EEs) of > 97 % in selectively extracting the aflatoxins (AFB1, AFB2, AFG1 and AFG2). High reproducibility marked by the low %RSDs of < 1% and low LODs of ≤ 0.02 ng/g were calculated in all cases. The LODs were within the monitoring requirements of the European Commission. The results were validated with a peanut butter certified reference material. The chlorophyll MIP on the other hand selectively removed chlorophyll that would otherwise interfere during pesticide residue analysis (PRA) from > 0.6 to <0.09 Au in green plants extracts. The extracted chlorophyll was removed to far below the level of ≥ 0.399 Au that is usually associated with interference during PRA. Furthermore, the MIP demonstrated better selectivity by removing only chlorophyll (> 99%) in the presence of planar pesticides than the currently employed graphitized carbon black (GCB) that removed both the chlorophyll (> 88%) and planar pesticides (> 89%). For the interfering cholic acid during drug residue analysis, cholic acid MIP electrospun nanofibers demonstrated to be more sensitive and possessing higher loading capacity than the MIP particles. 100% cholic acid was removed by the nanofibers from standard solutions relative to 80% by the particles. This showed that the nanofibers have better performance than the micro particles and as such have potential to replace the particle based SPE sorbents that are currently in use. All the templates were optimally removed from the prepared MIPs by employing a novel pressurized hot water extraction template removal method that was used for the first time in this thesis. The method employed only water, an environmentally friendly solvent to remove templates to ≥ 99.6% with template residual bleeding of ≤ 0.02%.

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4

Kampeerapappun, Piyaporn. "The Design, Characteristics, and Application of Polyurethane Dressings using the Electrospinning Process." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1207243006.

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5

McClellan, Phillip Eugene. "Electrospun PLLA Nanofiber Coating of Scaffolds for Applications in Bone Tissue Engineering." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1438340950.

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6

Jindal, Aditya Jindal. "Electrospinning and Characterization of Polyisobutylene-based Thermoplastic Elastomeric Fiber Mats For Drug Release Application." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1512483246405986.

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7

Smith, Meghan Elisabeth. "Biologically Functional Scaffolds for Tissue Engineering and Drug Delivery, Produced through Electrostatic Processing." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1251224066.

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Thesis(Ph.D.)--Case Western Reserve University, 2010
Title from PDF (viewed on 2009-12-30) Department of Chemical Engineering Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center

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8

Gulamussen, Noor Jehan. "Electrospun sorbents for solid phase extraction (SPE) and colorimetric detection of pesticides." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013241.

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The thesis presents the evaluation of polysulfone sorbents for solid phase extraction (SPE) and the development of colorimetric probes for pesticides analysis in water. Through electrospraying and electrospinning techniques, different morphologies of sorbents (particles, beaded fibers and bead-free fibers) were fabricated. The sorbents were morphologically characterized by scanning electron microscopy. Adsorption capacities of sorbents were evaluated by conducting recoveries studies for model pesticides; atrazine, chlorpyrifos and DDT using batch and column SPE modes. Better recovery results were achieved by employing the batch mode of fibers, as values ranged from 98 to 105percent. Further sorbent evaluation was conducted using breakthrough experiments and static experiments. The breakthrough studies indicated that 1700 μL was the sample volume that could be percolated with no breakthrough of the analyte that correspond to a concentration of 150 mg/g of sorbent that can be extracted without any loss of analyte. From static studies, quantities of each model compound adsorbed into the fiber at the equilibrium time were evaluated. The adsorbed atrazine was 65, chlorpyrifos 250 and DDT 400 mg/g of sorbent. Kinetic studies suggested retention mechanism following pseudo first and second order model observed by high correlation coefficients (> 0. 96), demonstrating the fiber affinity to retain both polar and non-polar compounds opening a possibility to be used as sorbent for sample preparation of different classes of pesticides in water. For the second part of the study simple strategies for colorimetric sensing based on silver nanoparticles and polivinylpyrrolidone capped nanoparticles were developed, respectively for atrazine and chlorpyrifos detection. The limits of detection of the methods were 3.32 and 0.88 mg/L for atrazine and chlorpyrifos respectively. The applicability of the probe in real samples was demonstrated by the recoveries studies of tap water varying from 94 to 104 percent. The versatility of the probe was demonstrated by affording a simple, rapid and selective detection of atrazine and chlorpyrifos in the presence of other pesticides by direct analysis without employing any sample handling steps. Attempt to incorporate the probes in a solid support was achieved by using nylon 6 as solid support polymer proving to be fast and useful for on-site detection.

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9

Xue, Ruipeng. "Nanofiber Based Optical Sensors for Oxygen Determination." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405508835.

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10

Shah, Parth Nimish. "Biocompatibility Analysis and Biomedical Device Development Using Novel L-Tyrosine Based Polymers." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1238781002.

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11

Heath, Daniel Edward. "Methacrylic Terpolymer Biomaterials for Cardiovascular Applications." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276802114.

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12

Lee, Carol Hsiu-Yueh. "Electrospun Polycaprolactone Scaffolds for Small-Diameter Tissue Engineered Blood Vessels." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376924954.

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13

Nelson, Mark Tyler. "Biomimetic Electrospun Fibers for Cancer Cell Migration, Chemotaxis, andAnti-Metastatic Drug Testing." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429031970.

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14

Guo, Qiongyu. "POSS-Based Biodegradable Polymers for Stent Applications: Electroprocessing, Characterization and Controlled Drug Release." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1259706279.

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Thesis(Ph.D.)--Case Western Reserve University, 2010
Title from PDF (viewed on 2009-12-22) Department of Macromolecular Science and Engineering Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center

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15

Meng, Linghui. "Polymer Biomaterial Constructs For Regenerative Medicine and Functional Biological Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1327682278.

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16

Wade, Mary E. "Engineering of Elastomeric Biomaterials and Biomimicry of Extracellular Matrix for Soft Tissue Regeneration." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1478000902817738.

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17

Girondi, Camila Miorelli. "Síntese e caracterização de ácido-all-trans-retinoico incorporado a nanofibras poliméricas e seus efeitos sobre células de osteossarcoma." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/154479.

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As nanofibras (NF) podem ser sintetizadas por meio de eletrofiação, um método simples que permite incorporação de fármacos em biopolímeros que apresentam a vantagem de serem liberados de forma gradual. Policaprolactona (PCL) apresenta a vantagem de poder ser eletrofiada permitindo a incorporação de fármacos. Os ácidos retinoicos são fármacos empregados no tratamento de osteossarcoma, mas, apresentam efeitos colaterais. O ATRA (all-trans-retinoic-acid) é o mais comum entre os retinoides. Os objetivos deste estudo foram: sintetizar e caracterizar NF, incorporar o fármaco a elas e verificar a liberação ao meio de cultura; realizar testes de citoxicidade e genotoxicidade tais como: crescimento, integridade, viabilidade e micronúcleo de células MG63 tratadas com NF incorporada com ATRA e analisar a secreção das citocinas pró inflamatórias: IL-1β, IL-6 e TNF-α por meio do teste ELISA. As NF sintetizadas por meio da eletrofiação foram caracterizadas morfologicamente e bioquimicamente por meio de microscopia eletrônica de varredura (MEV) e estudo do espectro de infravermelho da transformada de Fourrier (FTIR): Os testes in vitro foram realizados utilizando uma linhagem de células imortalizadas de osteossarcoma, MG63. Os ensaios incluídos nesse estudo foram divididos em grupos compostos por: [C (controle puro), ATRA (controle positivo), NF (controle negativo) e NF + ATRA (grupo experimental).] Em todos os grupos foram realizados testes de viabilidade celular (MTT), micronúcleo e ELISA sob os tempos de 3, 7 e 14 dias. A liberação do fármaco através do sistema de NF+ATRA foi comprovada pelo FTIR. Os demais resultados encontrados foram avaliados através do teste ANOVA one-way, no qual o método apresentou-se eficiente, mostrando diferença estatística de p=0,00, sendo signficante para todos os períodos de tempo nos testes de MTT e MN, além de ser verificada a secreção de citocinas proinflamatórias IL-1β e IL-6, comprovando os efeitos citotóxicos e genotoxicos sob células MG63 mostrando a efetividade da técnica. Podendo ser uma alternativa para o tratamento.
Nanofibers (NF) can be synthesized by electro-spinning, a simple method that allows incorporation of drugs into biopolymers that have the advantage of being released gradually. Polycaprolactone (PCL) has the advantage that it can be electrophied allowing the incorporation of drugs. Retinoic acids are drugs used in the treatment of osteosarcoma, but have side effects. ATRA (all-trans-retinoicacid) is the most common retinoid. The objectives of this study were: to synthesize and characterize NF, to incorporate the drug to them and to verify the release to the culture medium; perform cytotoxicity and genotoxicity tests such as: growth, integrity, viability and micronucleus of N63-treated NF-treated cells with ATRA and to analyze the secretion of pro-inflammatory cytokines: IL-1β, IL-6 and TNFα by the ELISA . The NF synthesized by electrophilation were characterized morphologically and biochemically by scanning electron microscopy (SEM) and Fourrier Transform Infrared Spectrum (FTIR) study: In vitro tests were performed using an immortalized osteosarcoma cell line, MG63. The trials included in this study were divided into groups composed of: C (pure control), ATRA (positive control), NF (negative control) and NF + ATRA (experimental group). All groups were tested for cell viability (MTT), micronucleus and ELISA under the times of 3, 7 and 14 days. Release of the drug through the NF + ATRA system was confirmed by FTIR. The other results were evaluated using the oneway ANOVA test, in which the method was efficient, showing a statistical difference of p = 0.00, being significant for all time periods in the MTT and MN tests, besides the secretion of proinflammatory cytokines IL-1β and IL-6, proving the cytotoxic and genotoxic effects under MG63 cells, showing the effectiveness of the technique. It may be an alternative to treatment

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18

Chaparro, Francisco Javier. "Biocompatible Electrospun Vehicles To Enhance the Effectiveness Of Anti-Fertility Strategies And Their Biomimetic Properties As Blood Vessel Scaffolds." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1514986344784852.

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19

Nun, Nicholas. "Improving Skin Wound Healing Using Functional Electrospun Wound Dressings and 3D Printed Tissue Engineering Constructs." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1617985844538101.

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20

Ni, Hao-Hsin, and 倪浩鑫. "Research of Zirconia Nano Fibers Fabricated by Electrospinning." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/93980910993161586242.

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碩士
亞東技術學院
應用科技研究所
101
ZrO2 fibers has high-temperature-resistant property and anti-corrosion propertie, it can be used in chemical, aerospace and other areas of special environments. Currently, the main manufacturing technology of ZrO2 fiber is controlled by the United States, Britain and other developed countries, our country's manufacturing standards have a large gap between foreigners'. So, imported ZrO2 fibers and its products are expensive. Therefore, manufacturing high performance nano-ZrO2 ceramic fiber and studying the insulation performance, have important significance. ZrOCl2/PAN composite nanofibers with different structures were prepared by electrospinning, ZrO2 ceramic nanofibers was fabricated through calcinations. The microstructure of ZrOCl2/PAN composite nanofibers were characterized using scanning electron microscopy (SEM). Thermogravimetry (TGA) was used to analysis the thermal stability of ZrOCl2/PAN composite nanofibers and the calcining process of nanocomposites. The crystal structure and composition of ZrO2 ceramic nanofibers are characterized by X-ray diffractometry (XRD) and Fourier-Transform Infrared Spectrometer (FT-IR). The main conclusions are following: ZrOCl2/PAN composite nanofibers with ZrOCl2 of 10% have the best unformity, the average diameter of fibers is about 107.2 nm, and the fiber diameter distribution was narrow. In the sintering process, organic was removed, the structure of ZrO2 was keeping fiber stucture, because ZrO2 nuclei are growing on the basis of before ZrOCl2/PAN nanofibers, direction and structure. When the sintering temperature increasing, ZrO2 particles become larger, the structure of ZrO2 fibers are being destroyed for monoclinic and tetragonal mutual was transforming and ZrO2 grains are expanding or shrinking constantly. So, getting ZrO2 nanofibers with high-performance, the sintering temperature is the key. ZrO2 ceramic nanofibers concentrated at 700 °C was the monoclinic phase mixed with tetragonal phase. The average diameter of ZrO2 nanoparticles is only 10.6nm. ZrO2 ceramic nanofibers could improve the radiating performance of the composite material.

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21

Lai, Hao-Wei, and 賴昊威. "Research and Analysis on Piezoelectric Properties of Near-field Electrospinning PVDF Nanofiber." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/34575376298096917768.

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碩士
國立中山大學
機械與機電工程學系研究所
99
In this study, with near-field electrospinning technique of PVDF (Polyvinylidene fluoride) piezoelectric nano-fibers and the additional multiwalled-carbon nanotubes(MWCNT), both mechanical strength and piezoelectric characteristics of a single nano-fiber were discussed. Then the behavior of piezoelectric fiber actuators was realized using inverse piezoelectric effect. Near-field electrostatic technology can be used to fabricate PVDF piezoelectric fibers with an excellent piezoelectric property compared with film structures due to a higher piezoelectric coefficient and energy conversion efficiency. It is more suitable to produce micro transducers. By adjusting velocity of a fully parametric x-y stage, DC voltage, and the distance between the needle and collection plate, the morphology and polarization intensity of piezoelectric fiber can fully be controlled. In addition, the optimal parameters of PVDF solution such as PVDF powder weight percentage and MWCNT were also discussed. From the observation of XRD (X-ray diffraction), it reveals a high diffraction peak at 2θ=20.8° of piezoelectric crystal β-phase structure. Finally, the actuation property was tested using DC voltage supply, and fiber has significant deflection in the experiment. The vertical deflection can be observed and compared with model solution of piezoelectric cantilever structure. In the fiber’s direct piezoelectric effect, the result shows that fiber can produce an open circuit voltage of 15mV under a low frequency vibration of 7Hz.

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22

KO, CHIA-YING, and 柯佳瑩. "Antibacterial research of Ag nanoparticles hybrid PVA membranes prepared by electrospinning technology." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/39248572247343142392.

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23

Jian-Ting, Lin, and 林建廷. "Research on Lithium Ion Batteries Separator is made by Electrospinning of Nanofibers." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/80884996999829400650.

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碩士
中國文化大學
化學工程與材料工程學系奈米材料碩士班
104
Products that use lithium-ion secondary batteries, such as lightweight electronics and electric transportation, are becoming increasingly popular. Isolation membranes are a key element in the manufacturing of lithium batteries. They act as a conductor to fully transport lithium-ion electrolytes between positive and negative electrodes while maintaining the wettability of electrolytes during battery recharge and discharge. The quality of the isolation membranes determines the application performance of the battery. At the same time, the demand for environmental friendliness of such membranes has steadily increased. Therefore, during the design phase, in addition to safety considerations, research and development for new isolation membrane materials are also spurred. In the present study, an electrospinning instrument was employed to spin cellulose diacetate following such processes as solution formulation, parameter adjustment, and electrospinning. Once the optimal concentration was determined, samples were produced with two different spinning distances (10cm and 15cm) and three different operating voltages (10kV, 15kV, and 20kV). The membrane with the optimal electrospinning properties was then analyzed for its microstructures. The nanoscale properties of the refined cellulose acetate isolation membrane include nanoscale porosity (porous walls of the cellulose acetate and staggered nanoscale pores) structures, electrolyte wettability, and loss of thermal weight. Cellulose acetate isolation membranes were then compared with plastic polyethylene isolation membranes. The test results revealed that favorable staggered pores, electrolyte wettability, and fiber smoothness were achieved with a concentration of 20%, a spin distance of 10cm, and an operating voltage of 15kV, which enhanced the membrane performance. Thus, cellulose acetate could substitute for the composite materials used for polyethylene isolation membranes that are currently available on the market.

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24

Chu, Hsin-Jung, and 朱信融. "Research on the Electrospinning Processed Highly Aligned P(VDF-TrFE) and Related Composite Film Applications." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/10483146131077996543.

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碩士
國立臺灣大學
應用力學研究所
104
Using the electrospinning process to fabricate highly aligned arrays of nanofibers of poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)(75/25) were the main research topic in this thesis and we found the optimal parameters of electrospinning process to fabricate the highly aligned membrane. (P(VDF-TrFE) was a ferroelectric material and having several advantages, such as good chemical stability, high sensitivity, biocompatibility and strong piezoelectricity. Because of the above-mentioned advantages, (P(VDF-TrFE) membrane was suitable for the development of flexible sensors. After electrospinning process, (P(VDF-TrFE) nanofiber was aligned to become highly aligned membrane and it provided (P(VDF-TrFE) with more β phase, i.e., with higher piezoelectric performance. Furthermore, we used annealing and corona poling processes to enhance the piezoelectricity of (P(VDF-TrFE). In this thesis, we measured the hysteresis loop of (P(VDF-TrFE) membrane to determine its ferroelectricity. We also used X-ray diffraction (XRD) and scanning electron microscope(SEM) to observe its crystallization and surface structure. Although P(VDF-TrFE) was identified to have improved mechanical properties along the fiber axial orientation after electrospinning and annealing process, it was found to be weak along the lateral axis. To alleviate this problem, we coated polydimethylsiloxane (PDMS) on the membrane to enhance its mechanical properties, water resistant and promote potential on application of flexible sensor.

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