PVDF Nanoweb Touch Sensors Prepared Using Electro-Spinning Process for Smart Apparels Applications

2008 ◽  
Vol 60 ◽  
pp. 52-57 ◽  
Author(s):  
Sun Yoon ◽  
Arun Anand Prabu ◽  
S. Ramasundaram ◽  
Kap Jin Kim
Keyword(s):  
Polyvinylidene Fluoride ◽  
Sensor Applications ◽  
Touch Sensor ◽  
Multi Walled Carbon Nanotube ◽  
Custom Made ◽  
Spinning Process ◽  
Ft Ir ◽  
Set Up ◽  
Calculated Amount ◽  
Ft Ir Spectroscopy

Polyvinylidene fluoride (PVDF) based electrospun nanoweb fibers with outstanding piezo-, pyro- and ferroelectric behavior are being intensely studied by many researchers, especially for touch-sensor applications. In order to further improve the advantageous characteristics of PVDF nanoweb fibers, we focused our attention on studying the effect of filling PVDF solution with calculated amount of calcium chloride (CaCl2) or multi-walled carbon nanotube (MWCNT), and their electrospun nanoweb fibers were analyzed for the changes in β-crystalline phase, and its associated piezoelectric characteristics using a custom-made sensor set-up developed in our lab. FT-IR spectroscopy was used to confirm the changes in the β-crystalline content with varying content of CaCl2 and MWCNT. SEM data revealed the reducing fiber diameter with increasing CaCl2 content. PVDF nanoweb subjected to pressure showed changes in touch sensing property as analyzed using an oscilloscope integrated with Labview program. Overall, the PVDF nanoweb containing the additives used in our study exhibited greater sensitivity-in-touch for use in smart apparel applications compared to unmodified PVDF nanoweb, and the results are reported in detail here.

Synthesis and Capacitance of Multi-Walled Carbon Nanotube/Polyaniline Nanocomposites

2013 ◽  
Vol 834-836 ◽  
pp. 108-111
Author(s):  
Qi Guan Wang ◽  
Wei Zhou ◽  
Su Min Wang ◽  
Wen Zhi Zhang ◽  
Jian Ping Li ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Carbon Nanotube ◽  
Ir Spectroscopy ◽  
Electrochemical Polymerization ◽  
Visible Spectroscopy ◽  
Multi Walled Carbon Nanotube ◽  
Pani Composite ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

We report on the synthesis and electrochemical properties of multi-walled carbon nanotube (MWNT)/polyaniline (PANI) nanocomposites. The MWNT/PANI composite was prepared through electrochemical polymerization and is confirmed by ultraviolet-visible spectroscopy (UV-vis) spectroscopy and Fourier transform infrared (FT-IR) spectroscopy. The MWNT/PANI nanocomposites show a specific capacitance value as high as 463 F/g.

Preliminary Study of Corrosion Mechanisms of Actinides Alloys: Calibration of FT-IR Spectroscopy

2008 ◽  
Vol 1104 ◽  
Author(s):  
Véronique Magnien ◽  
Marx Cadignan ◽  
Olivier Faivret ◽  
Gaelle Rosa
Keyword(s):  
Ir Spectroscopy ◽  
Accurate Estimation ◽  
Ir Absorption ◽  
Experimental Conditions ◽  
Ft Ir ◽  
Gaseous Atmospheres ◽  
Set Up ◽  
Corrosion Mechanisms ◽  
Ft Ir Spectroscopy

AbstractIn situ analyzes of gaseous atmospheres could be performed by FT-IR spectroscopy in order to study the corrosion reactions of actinides. Nevertheless experimental conditions and the nature of studied species have a strong effect on IR absorption laws. Thus a prior calibration of our set-up is required to obtain an accurate estimation of gas concentration. For this purpose, the behavior of several air pure gases has been investigated according to their concentration from IR spectra. Reproducible results revealed subsequent increases of the most significant peak areas with gas pressure and small deviations from Beer Lambert's law. This preliminary work allowed to determine precise absorption laws for each studied pure gas in our in situ experimental conditions. Besides our FT-IR set-up was well suitable to quantitative analysis of gaseous atmosphere during corrosion reactions. Finally the effect of foreign gas will be investigated through more complex air mixtures to obtain a complete calibration network.

Development of C-lignin with G/S-lignin and lipids in orchid seed coats – an unexpected diversity exposed by ATR-FT-IR spectroscopy

2018 ◽  
Vol 28 (1) ◽  
pp. 41-51 ◽  
Author(s):  
S.T. Barsberg ◽  
Y.-I. Lee ◽  
H.N. Rasmussen
Keyword(s):  
Ir Spectroscopy ◽  
Seed Coat ◽  
Biological Significance ◽  
Life Forms ◽  
Chemical Information ◽  
Seed Surface ◽  
Ft Ir ◽  
Set Up ◽  
Seed Coats ◽  
Ft Ir Spectroscopy

AbstractMembers of the orchid family occupy many germination niches, in terrestrial, epiphytic and epilithic environments. How orchid seeds attach to their substrate and survive after dispersal is largely unknown. C-lignin is a recently discovered specialized lignin, found in seed coats of some plants, including orchid species, but its functional and biological significance is obscure. We studied seed coat ontogenesis in three species (Neuwiedia veratrifolia, Cypripedium formosanum and Phalaenopsis aphrodite) that represent basal and advanced branches in orchid phylogeny and divergent life forms. From each species, controlled pollination yielded several stages of seed development, from which seed coats (testa) were isolated and analysed by ATR-FT-IR spectroscopy. The use of the ATR set-up ensured that the chemical information originated only from the integral outer seed surface layers. The FT-IR bands of C-lignin are presented here for the first time, and distinguished from bands of G/S-lignin. In the seed coats, C-lignin developed after G/S-lignin in N. veratrifolia and C. formosanum, while only G/S-lignin developed in P. aphrodite. We discuss C-lignin properties and possible function in relation to seed coat properties. The species differed with respect to sequence and amounts of deposition, not only of lignins but also lipids, resulting in differences in mature seed coat compositions. Thus we revealed an unexpected and marked diversity among orchids with respect to seed surface chemistry, with possible implications for seed and germination ecology.

scholarly journals Structure Tuning and Electrical Properties of Mixed PVDF and Nylon Nanofibers

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6096
Author(s):  
Petr Černohorský ◽  
Tatiana Pisarenko ◽  
Nikola Papež ◽  
Dinara Sobola ◽  
Ştefan Ţălu ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Photoelectron Spectroscopy ◽  
Polyvinylidene Fluoride ◽  
Complex Analysis ◽  
Polymeric Materials ◽  
Sample Surface ◽  
Polyamide 6 ◽  
Scanning Calorimetry ◽  
Spinning Process ◽  
Ft Ir

The paper specifies the electrostatic spinning process of specific polymeric materials, such as polyvinylidene fluoride (PVDF), polyamide-6 (PA6, Nylon-6) and their combination PVDF/PA6. By combining nanofibers from two different materials during the spinning process, new structures with different mechanical, chemical, and physical properties can be created. The materials and their combinations were subjected to several measurements: scanning electron microscopy (SEM) to capture topography; contact angle of the liquid wettability on the sample surface to observe hydrophobicity and hydrophilicity; crystallization events were determined by differential scanning calorimetry (DSC); X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and Fourier-transform infrared spectroscopy (FT-IR) to describe properties and their changes at the chemical level. Furthermore, for the electrical properties of the sample, the dielectric characteristics and the piezoelectric coefficient were measured. The advantage of the addition of co-polymers was to control the properties of PVDF samples and understand the reasons for the changed functionality. The innovation point of this work is the complex analysis of PVDF modification caused by mixing with nylon PA6. Here we emphasize that the application of nylon during the spin influences the properties and structure (polarization, crystallization) of PVDF.

scholarly journals The Preparation, Thermal Properties, and Fire Property of a Phosphorus-Containing Flame-Retardant Styrene Copolymer

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 127 ◽  
Author(s):  
Yu Sun ◽  
Yazhen Wang ◽  
Li Liu ◽  
Tianyuan Xiao
Keyword(s):  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Flame Retardant ◽  
Oxygen Index ◽  
Limiting Oxygen Index ◽  
Chemical Structures ◽  
1H Nuclear Magnetic Resonance ◽  
Phosphorus Containing ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

A 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) acrylate, (6-oxidodibenzo [c,e][1,2] oxaphosphinin-6-yl) methyl acrylate (DOPOAA), has been prepared. Copolymers of styrene (St) and DOPOAA were prepared by emulsion polymerization. The chemical structures of copolymers containing levels of DOPOAA were verified using Fourier transform infrared (FT-IR) spectroscopy and 1H nuclear magnetic resonance (1H-NMR) spectroscopy. The thermal properties and flame-retardant behaviors of DOPO-containing monomers and copolymers were observed using thermogravimetric analysis and micro calorimetry tests. From thermogravimetric analysis (TGA), it was found out that the T5% for decomposition of the copolymer was lower than that of polystyrene (PS), but the residue at 700 °C was higher than that of PS. The results from micro calorimetry (MCC) tests indicated that the rate for the heat release of the copolymer combustion was lower than that for PS. The limiting oxygen index (LOI) for combustion of the copolymer rose with increasing levels of DOPOAA. These data indicate that copolymerization of the phosphorus-containing flame-retardant monomer, DOPOAA, into a PS segment can effectively improve the thermal stability and flame retardancy of the copolymer.

Multiscale exploration of hydrocarbons adsorption and hopping through the ZSM-5 channels - from Monte Carlo modelling to experiment

2021 ◽  
Author(s):  
Maciej Strzempek ◽  
Karolina A. Tarach ◽  
Kinga Góra-Marek ◽  
Fernando Rey ◽  
Miguel Palomino ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ir Spectroscopy ◽  
Aliphatic Hydrocarbons ◽  
Adsorption Studies ◽  
Ft Ir ◽  
Gravimetric Adsorption ◽  
Hydrocarbons Adsorption ◽  
Ft Ir Spectroscopy

Abstract In this article the results of the statistical MC modelling corroborated by the FT-IR spectroscopy and gravimetric adsorption studies of the low aliphatic hydrocarbons in ZSM-5 (Si/Al =28 or...

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