Wettability of Electrospun Poly(vinylpyrrolidone)−Titania Fiber Mats on Glass and ITO Substrates in Aqueous Media

Jabal, Jamie M. F.; McGarry, Laurel; Sobczyk, Abigail; Aston, D. Eric

doi:10.1021/am900481d

Cited by 20 publications

(27 citation statements)

References 44 publications

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“…These spectra often had a fluorescent background that could not be readily replicated by a low-order polynomial. A micro-Raman spectrum of electrospun poly(vinylpyrollidone)-titania composite fibers (PVP-TiO 2 ) 21,22 was chosen as a proof-of-concept for the baseline correction procedure when applied to noisy micro-Raman spectra. In this case, the spectrum was obtained during an investigation for hyperspectral imaging of nanomaterials with structural features that are significantly smaller than the laser spot size (ca.…”

Section: Experimental Methodsmentioning

confidence: 99%

Automatic Baseline Subtraction of Vibrational Spectra Using Minima Identification and Discrimination via Adaptive, Least-Squares Thresholding

2012

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A method of automated baseline correction has been developed and applied to Raman spectra with a low signal-to-noise ratio and surface-enhanced infrared absorption (SEIRA) spectra with bipolar bands. Baseline correction is initiated by dividing the raw spectrum into equally spaced segments in which regional minima are located. Following identification, the minima are used to generate an intermediate second-derivative spectrum where points are assigned as baseline if they reside within a locally defined threshold region. The threshold region is similar to a confidence interval encountered in statistics. To restrain baseline and band point discrimination to the local level, the calculation of the confidence region employs only a predefined number of already-accepted baseline minima as part of the sample set. Statistically based threshold criteria allow the procedure to make an unbiased assessment of baseline points regardless of the behavior of vibrational bands. Furthermore, the threshold region is adaptive in that it is further modified to consider abrupt changes in baseline. The present procedure is model-free insofar as it makes no assumption about the precise nature of the perturbing baseline nor requires treatment of spectra prior to execution.

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Section: Experimental Methodsmentioning

confidence: 99%

Automatic Baseline Subtraction of Vibrational Spectra Using Minima Identification and Discrimination via Adaptive, Least-Squares Thresholding

2012

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“…46 Mats of nano/microfibres (fibre mats) have been electrospun from solutions of dispersed poly(vinylpyrrolidone) and a titania precursor onto glass and indium-tin oxide plates. 47 To evaluate the wetting properties, we also measured the WCA of the ultra-thin fibre mats which had been treated at 220 C. The findings which are shown in Table 1 make evident that an incorporation of TEOS results in an improved WCA. A doubling of the TEOS portion does not give rise to an enhanced WCA value.…”

Section: Water Contact Anglementioning

confidence: 99%

Synthesis and characterization of hydrophobic, ultra-fine fibres based on an organic–inorganic nanocomposite containing a polyimide functionality

Schramm

Rinderer

Tessadri

2019

Polymers and Polymer Composites

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Ultra-thin polyimide fibres were fabricated by means of the electrospinning method by using precursor solutions consisting of the organotrialkoxysilanes (3-triethoxysilylpropyl)succinic anhydride (TESP-SA), (3-amino)propyltriethoxysilane (APTES), tetraethoxysilane (TEOS) and methyltriethoxysilane (MTEOS). TESP-SA and APTES were reacted to the corresponding poly(amic)acid (PAA) in an aqueous medium which was electrospun at 15 kV and at a tip to collector distance of 15 cm. TEOS and MTEOS were also incorporated into the precursor solution to modify the surface properties of the ultra-fine fibre mat. The fibre diameter distributions of the as-prepared PAA fibres were measured. The PAA fibres were thermally treated at 220 C resulting in the formation of an organic-inorganic hybrid polyimide fibre mat with ladderlike structure, as could be shown by Fourier transform infrared spectroscopy and X-ray powder diffraction. The ultra-fine fibre assemblies were also characterized by means of scanning electron microscopy, thermogravimetric analysis and water contact angle measurements.

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“…Glass slides have a higher water wettability than Al foils [34,35] but a much lower thermal conductivity. The macromolecules of PVP are known to immobilize iron ions by weak interactions [36] or steric hindrance [37] acting as nanoreactors for the synthesis of nanoparticles by forming stable metal clusters [38].…”

Section: Morphology Of the Thermal Treated Samplesmentioning

confidence: 99%

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

Melo¹,

Santos²,

Gualdi³

et al. 2017

Electrospinning

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BiFeO 3 nanofibers of different morphologies and dimensions were produced by electrospinning varying the collector and thermal treatment. By thermogravimetric analyses (TGA) the thermal behavior of the as-spun nanofibers was studied. The morphology of the nanofibers was examined by transmission and scanning electron microscopy (TEM and SEM, respectively) while the chemical composition and crystal structure were analyzed by energy dispersive x-ray spectrometry (EDS) and wide angle x-ray diffraction (WAXD). A vibrating sample magnetometer (VSM) was used to evaluate the magnetic properties. Different types of mats with different nanofibers´dimen-sions were obtained; while some nanofibers were interconnected, others were completely separated and aligned. The thinnest nanofibers were obtained using an aluminum substrate with folds and after annealing at 550 ∘ C. All samples annealed at this temperature formed pure BiFeO 3 , while samples annealed at 550 and 750 ∘ C formed an additional Bi 2 Fe 4 O 9 phase. No iron impurities were detected; the crystallite size of all the nanofibers was between 30 and 36 nm. The saturation magnetization increased with the decrease of the nanofiber´s diameter and increase of nanofibers interconnectivity. Thus, this ferromagnetism behavior was attributed to the suppression of the spiral spin structure of BiFeO 3 (which has a 62 nm period) and to the morphology of interconnected nanofibers.

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Wettability of Electrospun Poly(vinylpyrrolidone)−Titania Fiber Mats on Glass and ITO Substrates in Aqueous Media

Cited by 20 publications

References 44 publications

Automatic Baseline Subtraction of Vibrational Spectra Using Minima Identification and Discrimination via Adaptive, Least-Squares Thresholding

Automatic Baseline Subtraction of Vibrational Spectra Using Minima Identification and Discrimination via Adaptive, Least-Squares Thresholding

Synthesis and characterization of hydrophobic, ultra-fine fibres based on an organic–inorganic nanocomposite containing a polyimide functionality

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

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