A Brief Review of New Fiber Microsphere Geometries

Gomes, André D.; Monteiro, Catarina S.; Silveira, Beatriz; Frazão, Orlando

doi:10.3390/fib6030048

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…On the other hand, it is well-known that the microspheres are also valuable fillers for the composite materials since they have lower density, provide dimensional stability with smooth surface, augment the impact strength, enhance the thermal insulation and reduce the cost. [19][20][21] Especially, the polymer-based microspheres make possible to fabricate rigid, endurable, functional, less susceptible to breakage and lightest filler particles for the composites. 22 Such microspheres with different morphological properties can be produced by means of the suspension, dispersion, emulsion, spray drying, solvent extraction, precipitation as well as inverse-suspension methods.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of crystallinity, thermal, mechanical and morphological features of high density polyethylene composites reinforced with crosslinked semifluorinated acrylate polymer microspheres

Soykan

Çetin

2022

Journal of Thermoplastic Composite Materials

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This study mainly aims both to prepare well-shaped crosslinked 3,3,4,4,5,5,6,6,7,7,8,8,8 tridecafluorooctyl-4-(acrloyloxy) benzoate (ABCF13) polymer microspheres and to investigate the influences of the prepared microspheres addition on the crystallinity, thermal, mechanical and morphological features of high density polyethylene (HDPE). The suspension polymerization method was used for the production of well-defined microspheres and, the content of the microspheres varied from 1.0% to 10.0% in the composites. The characterization of crosslinked poly(ABCF13) microsphere-loaded HDPE composites were performed via powder X-ray diffraction, differential scanning calorimeter, universal mechanical (tensile and impact) testers and scanning electron microscope (SEM) techniques. According to the experimental findings, a and b unit cell parameters increased initially and reached maxima with the sample including 5.0% microsphere, which were followed by dramatic decreases, while c parameter remained relatively unchanged. Thermal analysis also showed that the melting temperature of HDPE reduced with the initial loading of the microspheres, then stayed at a plateau value of about 129°C due to the formation of lattice distortions, generation of microstructural disorders and the defects in the crystal structures. The mechanical test results revealed that there existed considerable improvements in tensile strength, modulus and impact strength. The maximum tensile strength 25.66 MPa, elastic modulus 499.30 MPa and maximum absorbed energy in the impact test 26.84 kJ/m2 (29%, 42% and 41% improvement, respectively) were achieved with the blend involving 5.0% microsphere. After the maxima, the mechanical characters depicted weakening trend as the microsphere content increased in the matrix. The SEM analyses revealed that although there existed fibrillar formations in all samples, the extensions decreased with the increase of the microsphere content. While ductile behavior was observed with the formation of long-bulky extensions at low contents, brittleness started to prevail at high contents with some short and thin fibrils.

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Section: Introductionmentioning

confidence: 99%

Evaluation of crystallinity, thermal, mechanical and morphological features of high density polyethylene composites reinforced with crosslinked semifluorinated acrylate polymer microspheres

Soykan

Çetin

2022

Journal of Thermoplastic Composite Materials

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“…Such measurements can be very precise but are usually indirect and exploit the effect of small parametric changes in the propagation of guided lightwaves. The accuracy of these sensors relies on interferometry that is made possible, for instance, by building hollow core microcavities (as small as 30µm [1,2]) using capillary tubes or photonic crystal fibers (PCFs) at end of a cleaved optical fiber [1,[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], that act as miniature Fabry-Perot interferometers. Fabry-Perot cavities in optical fibers were firstly fabricated by Sirkis et al for strain measurement [3] and, since then, similar interferometric sensors have been proposed for curvature [12], temperature [11], pressure [5], humidity [15], acoustic sensing [17], among others.…”

Section: Introductionmentioning

confidence: 99%

Environmental Sensitivity of Fabry-Perot Microcavities Induced By Layered Graphene-Dielectric Hybrid Coatings

Peixoto,

Pires,

Monteiro

et al. 2021

Preprint

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We propose a novel fiber-based environmental sensor that exploits the reflection phase shift tunability provided by the use of layered coatings composed of dielectric slabs spaced by conducting membranes. A transfer matrix study is done in a simplified theoretical model, for which an enhanced sensitivity of the reflection interference pattern to the output medium is demonstrated, in the typical refractive index range of liquid media. An experimental configuration using a cascaded Fabry-Perot microcavity coated by a graphene oxide/polyethylenimine (GO/PEI) multilayered structure is demonstrated. Its cost effective chemical production method makes graphene oxide-based hybrid coatings excellent candidates for future real-life sensing devices.

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“…The requirement for the long-term monitoring of temperature in severe, remote conditions caused fiber-optic sensors application in many fields, including industry, e.g., building applications, oil leakage railway infrastructure [ 29 , 30 , 31 , 32 , 33 ], but also they are used in biochemistry [ 34 ]. Moreover, fiber-optic sensors can be adapted to best suit the needs of specific applications, by modifying geometrical parameters or by adding additional passive components, such as coatings [ 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

ZnO ALD-Coated Microsphere-Based Sensors for Temperature Measurements

Listewnik

Bechelany

Jasiński

et al. 2020

Sensors

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In this paper, the application of a microsphere-based fiber-optic sensor with a 200 nm zinc oxide (ZnO) coating, deposited by the Atomic Layer Deposition (ALD) method, for temperature measurements between 100 and 300 °C, is presented. The main advantage of integrating a fiber-optic microsphere with a sensing device is the possibility of monitoring the integrity of the sensor head in real-time, which allows for higher accuracy during measurements. The study has demonstrated that ZnO ALD-coated microsphere-based sensors can be successfully used for temperature measurements. The sensitivity of the tested device was found to be 103.5 nW/°C when the sensor was coupled with a light source of 1300 nm central wavelength. The measured coefficient R2 of the sensor head was over 0.99, indicating a good fit of the theoretical linear model to the measured experimental data.

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A Brief Review of New Fiber Microsphere Geometries

Cited by 6 publications

References 37 publications

Evaluation of crystallinity, thermal, mechanical and morphological features of high density polyethylene composites reinforced with crosslinked semifluorinated acrylate polymer microspheres

Evaluation of crystallinity, thermal, mechanical and morphological features of high density polyethylene composites reinforced with crosslinked semifluorinated acrylate polymer microspheres

Environmental Sensitivity of Fabry-Perot Microcavities Induced By Layered Graphene-Dielectric Hybrid Coatings

ZnO ALD-Coated Microsphere-Based Sensors for Temperature Measurements

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