Characterisation of sol-gel-based hybrid silicon dioxide/heteroarylthiazole dyes on polyamide fabric

2012 ◽  
Vol 128 (4) ◽  
pp. 276-282
Author(s):  
Ming-Shien Yen ◽  
Mu-Cheng Kuo ◽  
Chien-Wen Chen
Keyword(s):  
Silicon Dioxide ◽  
Sol Gel ◽  
Polyamide Fabric ◽  
Hybrid Silicon

Enhanced tribological properties of bismaleimides with a novel hybrid silicon dioxide containing amino groups

2020 ◽  
Vol 32 (10) ◽  
pp. 1150-1159
Author(s):  
Yuan Jia ◽  
Juxiang Yang ◽  
Xue Hu ◽  
Zhen Liu
Keyword(s):  
Silicon Dioxide ◽  
Tribological Properties ◽  
Sol Gel ◽  
Amino Groups ◽  
Silicon Dioxide Nanoparticles ◽  
Friction Process ◽  
Excessive Heat ◽  
Sol Gel Process ◽  
Volume Wear ◽  
Hybrid Silicon

To improve the tribological properties of bismaleimide (BMI) resin, silicon dioxide nanoparticles with imino and terminal functional amino groups were prepared through a sol–gel process to form a novel SiO2-NH2 hybrid. The as-prepared hybrid was then applied as a modifying agent for the BMI matrix to obtain SiO2-NH2/BMI composites. Compared to those of pure BMI resin, the volume wear rate and friction coefficient of the SiO2-NH2/BMI composites decreased significantly, while the wear mechanism changed from fatigue (BMI) to adhesive (SiO2-NH2/BMI) wear. This improvement in the tribological properties of the SiO2-NH2/BMI composites was attributed to the appropriate SiO2-NH2 added content, which endowed the BMI with excellent mechanical and thermal-resistant properties. Thus, the SiO2-NH2/BMI composites could resist the external load and excessive heat during the friction process.

Silicon dioxide nanotubes prepared by anodic alumina as templates

2000 ◽  
Vol 15 (2) ◽  
pp. 387-392 ◽  
Author(s):  
Ming Zhang ◽  
Y. Bando ◽  
K. Wada
Keyword(s):  
Silicon Dioxide ◽  
Aging Time ◽  
Room Temperature ◽  
Sol Gel ◽  
Silica Sol ◽  
Anodic Alumina ◽  
Template Method ◽  
Nanochannel Array ◽  
Inside Wall ◽  
Dipping Time

Aligned slicon dioxide nanotubes with diameters of 30–40 nm synthesized by the sol-gel template method are presented. This process involves the growth of nanotubes from ordered nanochannel-array pores in anodic alumina. For a silica sol aged at room temperature and dipped for 1 min, nanowires were formed in a shorter period of aging time (2 days); nanotubes connecting with solid nanofibers were obtained in a longer aging time (30 days). The formation of nanotubes depends strongly on the temperature of the sol. For a short dipping time (<1 min), bamboolike nanofibers were prepared when the sol was at high temperature (50 °C); however, perfect nanotubes with the sharp wall were synthetized for the lower sol temperature (5 °C). The lower sol temperature is, the smoother the inside wall of nanotubes is. It is proved that viscosity plays an important role on the morphology of nanotubes.

Silicon Carbide Nanowire Devices for Label-Free Electrical DNA Detection

2015 ◽  
Vol 821-823 ◽  
pp. 855-858 ◽  
Author(s):  
Louis Fradetal ◽  
Edwige Bano ◽  
Laurent Montes ◽  
Giovanni Atolini ◽  
Valérie Stambouli
Keyword(s):  
Silicon Carbide ◽  
Silicon Dioxide ◽  
Sol Gel ◽  
Label Free ◽  
Dna Molecules ◽  
Metal Insulator ◽  
Capacitance Measurements ◽  
Silicon Dioxide Matrix ◽  
Nanopillar Arrays

Silicon Carbide is a promising material to overtake the limitations of Si sensors used forin vivodetection. Here, two different nanodevices are presented. The first one is a SiC NWFET used for electrical detection of DNA molecules. The addition of DNA probe molecules increases the current by 25% and the hybridization with DNA targets increases by 80%. This confirms the efficiency of our sensor to detect DNA. The second one is a Metal Insulator Semicondutor capacitor composed of DNA functionalized SiC nanopillar arrays embedded in a sol-gel silicon dioxide matrix. Capacitance measurements show a singular response between 80 and 100 Hz which is attributed to the presence of DNA molecules.

The Study of the Silicon Dioxide Anti-reflection Film Prepared by the Sol-gel Method

2015 ◽  
Author(s):  
Jianfeng Li ◽  
Tatirna Seegevna Ivanova ◽  
Hongyuan Fan ◽  
Dezhen Wang
Keyword(s):  
Silicon Dioxide ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

Morphological, chemical and structural characterization of silica-containing polyvinylpyrrolidone electrospun nanofibers prepared by sol-gel technique

2016 ◽  
Vol 79 (1) ◽  
pp. 5-12 ◽  
Author(s):  
T. Tański ◽  
W. Matysiak ◽  
M. Zaborowska ◽  
D. Łukowiec ◽  
M. Krzesiński
Keyword(s):  
Silicon Dioxide ◽  
Polymer Matrix ◽  
Sol Gel ◽  
Tetraethyl Orthosilicate ◽  
Organic Polymer ◽  
Metal Alkoxide ◽  
Structural Examination ◽  
Polymer Hydrolysis ◽  
Uniform Dispersion ◽  
Gel Technique

Purpose: The aim of this study was to produce poly(vinylpyrrolidone) (PVP) containingsilica nanofibers using electrospinning method from 10% PVP/EtOH solutions with differentmass concentration 0 and 30% of tetraethoxysilane. Sol-gel technique was used to obtainnanofiber membranes with high amount of inorganic phase. In the case when metal alkoxide,such as tetraethyl orthosilicate (TEOS) is mixed with an organic polymer, hydrolysis andcondensation reaction of TEOS occur in-situ with polymer matrix, which allows to fabricateorganic-inorganic hybrid structures with uniform dispersion.Design/methodology/approach: The examination of the morphology of the obtainedPVP/silicon dioxide nanofibers using scanning electron microscope (SEM) has been made.The chemical structure of produced nanostructures was investigated by Fourier - TransformInfrared spectroscopy (FTIR) and Energy Dispersive Spectrometry (EDX) to analyze theregular dispersion by examining types of bonds occurring between polymer matrix and SiO2phase.Findings: Results obtained in this paper shows that the mass concentration of thereinforcing phase in form of TEOS have an influence on the average diameter of nanofibersand with the increase of tetraethyl orthosilicate in solution nanofibers diameters decrease.Moreover, structural examination shows uniform dispersion of the reinforcing phase in hybridmaterials.Research limitations/implications: Uniform dispersion of the reinforcing phase insilica-containing PVP nanofibers gives the opportunity to make nanowires in calcinationprocess from such obtained fibrous mats and use in novel electrical devices.Originality/value: This paper describes an easy and more effective way of makingpolymer nanofibers with the content of silicon dioxide with the perspective way of makingsilica nanowires in the future from obtained hybrid nanofibers, so that this method canreplace commonly used nanowires growth processes.

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