Fabrication of tragacanth and water soluble tragacanth nanoparticles through electrospraying

Authors

Zhinoos Javadi, Hossein Tavanai, Alireza Allafchian, Mohammad Morshed

Publication date

2018/7

Journal

Polymers for Advanced Technologies

Volume

29

Issue

7

Pages

2036-2041

Description

This work reports the fabrication of tragacanth and water soluble tragacanth (WST) through electrospraying technique. Tragacanth is a biocompatible and biodegradable carbohydrate with a wide range of applications. Suspensions of tragacanth in water and water‐ethanol (70:30) were electrosprayed successfully. Moreover, deesterified tragacanth (WST), which is highly water soluble, was also successfully electrosprayed. The results showed that electrospraying technique is capable of producing tragacanth nanoparticles with an average size in the range of 30 to 50 nm, depending on the electrospraying conditions. Water soluble tragacanth gave rise to even smaller nanoparticles. It was also found that lowering feed rate, increasing nozzle‐ collector distance, and increasing voltage decrease the average size of the electrosprayed tragacanth nanoparticles. The molecular weight of tragacanth and WST was

Electrosprayed Cerium Oxide Nanoparticles

Authors

Pedram Bagherzadeh Azar, Hossein Tavanai, Ali Reza Allafchian

Publication date

2018/7/1

Journal

Journal of Electronic Materials

Volume

47

Issue

7

Pages

3779-3787

Publisher

Springer US

Description

Cerium oxide nanoparticles were fabricated via the calcination of electrosprayed polyvinyl alcohol (PVA)/cerium nitrate nanoparticles. The effect of material variables of PVA/cerium nitrate electrospraying solution, i.e. viscosity, surface tension and electrical conductivity, as well as important process variables like voltage, nozzle–collector distance and feed rate on cerium oxide nanoparticle size, are investigated. Scanning electron microscopy and Fourier-transform infrared (FTIR) spectroscopy analysis have also been carried out. The results showed that electrospraying of PVA/cerium nitrate (25% w/v) was only possible with PVA concentrations in the range of 5–8% w/v. With other conditions constant, decreasing PVA concentration, decreasing feed rate, increasing nozzle–collector distance and increasing voltage decreased the size of the final cerium oxide nanoparticles. The gross average size of all cerium

Fabrication of cellulose nanoparticles through electrospraying

Authors

Nastaran Kadivar, Hossein Tavanai, Alireza Allafchian

Publication date

2018/3/23

Journal

IET nanobiotechnology

Volume

12

Issue

6

Pages

807-813

Publisher

IET Digital Library

Description

This study reports the fabrication of cellulose nanoparticles through electrospraying the solution of cellulose in N,N-dimethylacetamide/lithium chloride solvent as well as investigating the effect of electrospraying conditions and molecular weight on the average size of electrosprayed nanoparticles. Electrospraying of cellulose was carried out with the following range for each factor, namely concentration = 1–3 wt%, voltage = 15–23 kV, nozzle–collector distance = 10–25 cm, and feed rate = 0.03–0.0875 ml/h. The smallest nanoparticles had an average size of around 40 nm. Results showed that lowering the solution concentration and feed rate, as well as increasing the nozzle–collector distance and applied voltage led to a decrease in the average size of the electrosprayed cellulose nanoparticles. Fourier transform infrared analysis proved that no chemical change had occurred in the cellulose structure …

An investigation on the fabrication of conductive polyethylene dioxythiophene (PEDOT) nanofibers through electrospinning

Authors

Nasim Zarrin, Hossein Tavanai, Amir Abdolmaleki, Mehdi Bazarganipour, Farzaneh Alihosseini

Publication date

2018/10/1

Journal

Synthetic Metals

Volume

244

Pages

143-149

Publisher

Elsevier

Description

This article reports on the possibility of the fabrication of conductive PEDOT (3,4 poly ethylene dioxythiophene) nanofibers through electrospinning. Electrospinning of pure PEDOT nanofibers from its solution has not yet become possible. Also in this work, the efforts to electrospin pure PEDOT or pure EDOT nanofibers proved fruitless. Hence, poly(acrylic acid) (PAA)was employed to assist the electrospinning of EDOT. EDOT:PAA nanofibers were collected in an oxidation bath, where in-situ polymerization of EDOT into PEDOT occurred. After a series of experiments, PEDOT/PAA (50:50) and PEDOT/PAA (67:33) nanofibers were successfully fabricated. The lowest average diameter of the PEDOT/PAA nanofibers was around 300 nm. An electrical conductivity of 0.16 S/cm was recorded for the PEDOT/PAA (50:50) nanofibrous web which is a considerable improvement over similar products reported in the literature. X

Controlled release of Doxorubicin embedded in carboxymethyl chitosan nanofibers

Authors

Azadeh Fakharmanesh, Hossein Tavanai, Taghi Khayamian, Mohammad Morshed

Publication date

2018/2/1

Journal

The Journal of The Textile Institute

Volume

109

Issue

2

Pages

178-185

Publisher

Taylor & Francis

Description

This paper reports the fabrication of carboxymethyl chitosan (CMCH) nanofibers containing Doxorubicin anti-cancer drug and studies the controlled release of Doxorubicin from the electrospun nanofibrous CMCH matrix. CMCH-Doxorubicin nanofibrous mats were electrospun from solutions containing 16.7, 25 and 34% (W/W) Doxorubicin. The diameter of the electrospun nanofibers lied in the range of 390–460 nm. It was found that increasing the share of Doxorubicin leads to higher diameter of the electrospun nanofibers. Fourier transform infrared spectroscopy analysis showed no reaction between Doxorubicin and carboxymethyl chitosan. X-ray diffractions showed that Doxorubicin was distributed as crystallites in the crystalline CMCH matrix. High performance liquid chromatography investigations proved that CMCH nanofibers containing Doxorubicin have the capability of controlled release of the drug. It was

An investigation on the fabrication of conductive polyethylene dioxythiophene (PEDOT) nanofibers through electrospinning

Authors

Nasim Zarrin, Hossein Tavanai, Amir Abdolmaleki, Mehdi Bazarganipour, Farzaneh Alihosseini

Publication date

2018/10/1

Journal

Synthetic Metals

Volume

244

Pages

143-149

Publisher

Elsevier

Description

This article reports on the possibility of the fabrication of conductive PEDOT (3,4 poly ethylene dioxythiophene) nanofibers through electrospinning. Electrospinning of pure PEDOT nanofibers from its solution has not yet become possible. Also in this work, the efforts to electrospin pure PEDOT or pure EDOT nanofibers proved fruitless. Hence, poly(acrylic acid) (PAA)was employed to assist the electrospinning of EDOT. EDOT:PAA nanofibers were collected in an oxidation bath, where in-situ polymerization of EDOT into PEDOT occurred. After a series of experiments, PEDOT/PAA (50:50) and PEDOT/PAA (67:33) nanofibers were successfully fabricated. The lowest average diameter of the PEDOT/PAA nanofibers was around 300 nm. An electrical conductivity of 0.16 S/cm was recorded for the PEDOT/PAA (50:50) nanofibrous web which is a considerable improvement over similar products reported in the literature. X