Effect of Relative Humidity on the Morphology of Electrospun Gelatin Aqueous Solutions

2014 ◽  
Vol 941-944 ◽  
pp. 1225-1228 ◽  
Author(s):  
Wei Wen Li ◽  
Xiao Hong Qin
Keyword(s):  
Aqueous Solution ◽  
Relative Humidity ◽  
Aqueous Solutions ◽  
Helical Structure ◽  
Electrospinning Process ◽  
Electrospun Gelatin

In this study, curled gelatin nanofiber was successfully electrospun from aqueous solution by elevating the spinning temperature. The effect of relative humidity was investigated on the morphology of gelatin nanofibers in the current study. It was observed that with the increase of relative humidity during electrospinning process, the proportion of the curled gelatin nanofiber increases. Futhermore, the curled gelatin nanofiber converted into helical structure when electrospun at relative humidity higher than 50%.

Electrospinnability of Gelatin Aqueous Solution with the Addition of Sodium Docecyl Sulfate and Ethanol

2011 ◽  
Vol 332-334 ◽  
pp. 2074-2078 ◽  
Author(s):  
Rui Tian Zhu ◽  
Yu Rong Yan ◽  
Yao Ming Zhao ◽  
Peng Zhang ◽  
Wei Pan
Keyword(s):  
Aqueous Solution ◽  
Fiber Diameter ◽  
Sodium Dodecyl ◽  
High Specific Surface Area ◽  
Electrospinning Process ◽  
Experimental Result ◽  
Gelatin Solution ◽  
Low Toxicity ◽  
Electrospun Gelatin ◽  
Nanofiber Mats

Gelatin is a kind of biopolymer obtained from animals and its fiber has been used as one of biocompatible dressings and sealants for many years. Electrospun gelatin nanofiber got more attention for its high specific surface area. Low toxicity gelatin nanofiber mats can be obtained by using water as the solvent in electrospinning process, but the fiber diameter below 150 nm is not easy to control and lots of beads were formed in the mats for low concentration solutions. In this study, sodium dodecyl sulfate (SDS) and ethanol were used to improve the electrospinnability of the gelatin solution with the concentration of 13 wt %. Experimental result revealed that SDS and ethanol reduced the surface tension of gelatin solution, meanwhile increased the conductivity and the viscosity. With the ratio between water and ethanol of 95 to 5, and SDS content varied from 0.3 wt % to 0.8 wt %, beads along the gelatin fibers vanished. Smooth and uniform gelatin fibers with fibers’ diameter around 110 nm were obtained.

scholarly journals Fast Coprecipitation of Calcium Phosphate Nanoparticles inside Gelatin Nanofibers by Tricoaxial Electrospinning

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Silvia Panzavolta ◽  
Chiara Gualandi ◽  
Andrea Fiorani ◽  
Barbara Bracci ◽  
Maria Letizia Focarete ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Aqueous Solutions ◽  
Fiber Length ◽  
Electrospinning Process ◽  
Inorganic Nanoparticles ◽  
New Method ◽  
Strain Measurements ◽  
Polymeric Solution ◽  
Calcium Phosphate Nanoparticles ◽  
Electrospun Gelatin

We present an effective method for fabricating electrospun gelatin nanofibers containing well-dispersed inorganic nanoparticles. The new method encompasses the use of a special triaxial needle where mixing calcium and phosphate aqueous solutions in an intermediate needle yield calcium phosphate (CaP) nanoparticles that immediately after precipitation are dragged by the outer polymeric solution and incorporated directly in the electrospinning jet, before nanofiber formation. Gelatin electrospun mats containing different amounts of CaP nanoparticles were prepared and characterized by SEM, TEM, TGA, and stress-strain measurements. The results demonstrate that CaP particles having diameter of few tens of nanometers were successfully introduced in the gelatin nanofibers during the electrospinning process and that they were well dispersed throughout the fiber length. In addition, the use of the special triaxial needle enabled modulating the CaP amount in the nanofibers.

Foliar Absorption and Translocation of Herbicides from Aqueous Solution and Treated Soil

Weed Science ◽  
1992 ◽  
Vol 40 (2) ◽  
pp. 281-287 ◽  
Author(s):  
Kassim Al-Khatib ◽  
Robert Parker ◽  
E. Patrick Fuerst
Keyword(s):  
Aqueous Solution ◽  
Relative Humidity ◽  
Aqueous Solutions ◽  
High Relative Humidity ◽  
Crop Damage ◽  
Foliar Uptake ◽  
Multiple Exposure ◽  
Foliar Absorption ◽  
Treated Soil ◽  
Plant Foliage

It has been suggested that soil treated with a herbicide and subsequently carried by wind and deposited on plant foliage can cause crop injury. This study compared foliar uptake and translocation of herbicides applied to plants as an aqueous solution or in herbicide-treated soil. Leaves of 3-wk-old seedling alfalfa, grape, and pea were treated with14C-labeled thifensulfuron, chlorsulfuron, glyphosate, 2,4-D, and bromoxynil. Significant amounts of all herbicides were absorbed by pea, alfalfa, and grape from the aqueous solutions, whereas very limited absorption occurred from herbicide-treated soil. Prolonged and multiple exposure to herbicide-treated soil did not increase herbicide uptake. High relative humidity enhanced herbicide absorption from aqueous solutions but not from herbicide-treated soil. All herbicides except bromoxynil were readily translocated in alfalfa, grape, and pea. Limited quantities of herbicides were absorbed from herbicide-treated soil by plant foliage, and this small amount is unlikely to cause crop damage.

Effect of polymerization degree of oligogalacturonates and D-galacturonans on their circular dichroic spectra

1979 ◽  
Vol 44 (1) ◽  
pp. 167-173 ◽  
Author(s):  
Slavomír Bystrický ◽  
Rudolf Kohn ◽  
Tibor Sticzay
Keyword(s):  
Physicochemical Properties ◽  
Aqueous Solutions ◽  
Helical Structure ◽  
Monomeric Unit ◽  
Polymerization Degree ◽  
Cd Spectra ◽  
Circular Dichroic

The CD spectra of aqueous solutions of homopolymeric sodium oligogalacturonates and D-galacturonans of polymerization degree n = 1-64, as well as lower calcium oligogalacturonates (n = 1-5) were measured. Chiroptic properties were correlated with the polymerization degree in terms of optical superposition of monomeric unit increments. Interpretation of obtained data, respecting further physicochemical properties entitles to conclude that the conformation of macromolecules of D-galacturonan in solution is close to helical structure.

Effect of thermal history of aqueous solutions of KCl on the metastable zone width

1984 ◽  
Vol 49 (3) ◽  
pp. 559-569 ◽  
Author(s):  
Jaroslav Nývlt
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Thermal History ◽  
Equilibrium Solubility ◽  
Metastable Zone Width ◽  
Zone Width ◽  
Preceding Experiment ◽  
History Of ◽  
Metastable Zone ◽  
The Given

The metastable zone width of an aqueous solution of KCI was measured as a function of the time and temperature of overheating above the equilibrium solubility temperature. It has been found that when the experiments follow close upon one another, the parameters of the preceding experiment affect the results of the experiment to follow.The results are interpreted in terms of hypotheses advanced in the literature to account for the effect of thermal history of solution. The plausibility and applicability of these hypotheses are assessed for the given cause of aqueous solution of a well soluble electrolyte.

scholarly journals I. Thermo-electric behaviour of aqueous solutions with mercurial electrodes

1879 ◽  
Vol 29 (196-199) ◽  
pp. 472-482 ◽  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Internal Diameter ◽  
Thermo Electric ◽  
Thin Glass ◽  
Mercury Surface

In order to investigate this subject, I devised and constructed the following apparatus :—A and B are two thin glass basins, 81 millims. internal diameter (= 5,153 sq. millims. of mercury surface), and 6·0 centims. deep; each containing a layer of mercury about 1·0 centim. deep, covered by a layer, about 3 centims. deep, of the aqueous solution to be examined.

scholarly journals Meta-studtite stability in aqueous solutions. Impact of HCO3−, H2O2 and ionizing radiation on dissolution and speciation

2021 ◽  
Author(s):  
Junyi Li ◽  
Zoltán Szabó ◽  
Mats Jonsson
Keyword(s):  
Aqueous Solution ◽  
Ionizing Radiation ◽  
Aqueous Solutions ◽  
Carbonate Complexes ◽  
C Nmr

Four different uranyl-(peroxide)-carbonate complexes were identified during studtite and meta-studtite dissolution in aqueous solution containing 10 mM HCO3− by 13C NMR.

scholarly journals Visualization of microwave near-field distribution in sodium chloride and glucose aqueous solutions by a thermo-elastic optical indicator microscope

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhirayr Baghdasaryan ◽  
Arsen Babajanyan ◽  
Levon Odabashyan ◽  
Jung-Ha Lee ◽  
Barry Friedman ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Field Distribution ◽  
Near Field ◽  
Absorption Properties ◽  
Novel Approach ◽  
Concentration Changes ◽  
Biological Liquids ◽  
Optical Indicator ◽  
Distribution Intensity

AbstractIn this study, a new optical method is presented to determine the concentrations of NaCl and glucose aqueous solutions by using a thermo-elastic optical indicator microscope. By measuring the microwave near-field distribution intensity, concentration changes of NaCl and glucose aqueous solutions were detected in the 0–100 mg/ml range, when exposed to microwave irradiation at 12 GHz frequency. Microwave near-field distribution intensity decreased as the NaCl or glucose concentration increased due to the changes of the absorption properties of aqueous solution. This method provides a novel approach for monitoring NaCl and glucose in biological liquids by using a CCD sensor capable of visualizing NaCl and glucose concentrations without scanning.

Fabrication of monodisperse polypyrrole/SBA-15 composite for the selective removal of Cr(Ⅵ) from aqueous solutions

2021 ◽  
Author(s):  
Liang Wang ◽  
Peng Gao ◽  
Mengxin Liu ◽  
Ziqing Huang ◽  
Shixia Lan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Adsorption Process ◽  
In Situ Polymerization ◽  
Selective Removal ◽  
Factors Affecting

Monodisperse polypyrrole/SBA-15 composite (PPy/SBA-15) was fabricated by in-situ polymerization and used for Cr(Ⅵ) adsorption from aqueous solution. PPy/SBA-15 was characterized by numerous approaches. Factors affecting the Cr(Ⅵ) adsorption process included...

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