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Zeitschriftendaten
Format
Zeitschrift
eISSN
2083-4799
ISSN
1730-2439
Erstveröffentlichung
23 Sep 2008
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

Volumen 13 (2013): Heft 1 (March 2013)

Zeitschriftendaten
Format
Zeitschrift
eISSN
2083-4799
ISSN
1730-2439
Erstveröffentlichung
23 Sep 2008
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

3 Artikel
access type Uneingeschränkter Zugang

Novel Polyurethanes as Antifouling Paint Matrices

Online veröffentlicht: 10 Jul 2013
Seitenbereich: 5 - 10

Zusammenfassung

Abstract

The new poly(ester-ether urethane)s (PEEUR) were prepared in two stage synthesis from formerly obtained oligo(alkylene ester-ether)diols (OAEE) and 4,4‘-diphenylmethane diisocyanate (MDI). PEEUR samples were subjected to crosslinking with styrene in the presence of radical polymerization initiators: methyl ethyl ketone peroxide (MEKPO) or cobalt 2-ethyl cyclohexanoate (EtHCo). Crosslinked PEEUR were characterized by their physicochemical and mechanical properties. Tensile strength of crosslinked PEEURs was in the range 63-29 MPa, hardness values were from 92 to 97°ShA, and glass transition temperature was in the range 59-74°C. For PEEURs filled with biocides tensile strength was in the range 6,8-8,5MPa, hardness values were from 82 to 92°ShA, and glass transition temperature was in the range 57-72°C. Optical microscopic observations showed that the materials obtained were homogeneous in micrometric scale.

Keywords

  • polyurethane
  • antifouling protection
  • unsaturated oligo(alkylene ester-ether)diols
  • poly(esteretherurethane) s
  • styrene crosslinking
access type Uneingeschränkter Zugang

Cr/Fe Ratio by Xps Spectra of Magnetoelectropolished Aisi 316L SS Using Linear, Shirley and Tougaard Methods of Background Subtraction

Online veröffentlicht: 10 Jul 2013
Seitenbereich: 11 - 20

Zusammenfassung

Abstract

In the paper, the analyses of Fe2p3/2 and chromium Cr2p3/2 XPS spectra with fitting by symmetrical and asymmetrical line shapes as well as using Linear, Shirley and Tougaard Method of Background Subtraction are presented. The calculations are performed on AISI 316L SS biomaterial after magnetoelectropolishing MEP operation. It was found, the chromium-to-iron ratio after magnetoelectropolishing MEP for other analyses could be in the range from 2.2 to 6.2 depending on the line shapes as well as type of backgrounds used to XPS spectra fitting. The most important for comparison the surface layers concerning the Cr/Fe ratio is to use the same line shape and backgrounds for all analyses.

Keywords

  • XPS spectra fitting
  • Linear
  • Shirley
  • Tougaard Backgrounds
  • 316L SS
  • Magnetoelectropolishing MEP
  • Cr/Fe ratio
access type Uneingeschränkter Zugang

Optical Properties of ZnO Thin Film

Online veröffentlicht: 10 Jul 2013
Seitenbereich: 21 - 29

Zusammenfassung

Abstract

In this work, we studied with a Matlab program, some of optical properties of zinc oxide (ZnO) deposited on glass (SiO2). The parameters studied include the refraction index, extinction coefficient, optical band gap, and complex dielectric constant versus incident photon energy, and transmittance, absorbance and reflectance spectrum of ZnO thin film deposited on glass (SiO2) for different thickness. The films were found to exhibit high transmittance (75- 95%), low absorbance and low reflectance in the visible / near infrared region up to 1000 nm. However, the absorbance of the films was found to be high in the ultra violet region with peak around 380 nm.

Keywords

  • ZnO
  • Thin film
  • optical properties
  • Sol gel deposition
  • Matlab
3 Artikel
access type Uneingeschränkter Zugang

Novel Polyurethanes as Antifouling Paint Matrices

Online veröffentlicht: 10 Jul 2013
Seitenbereich: 5 - 10

Zusammenfassung

Abstract

The new poly(ester-ether urethane)s (PEEUR) were prepared in two stage synthesis from formerly obtained oligo(alkylene ester-ether)diols (OAEE) and 4,4‘-diphenylmethane diisocyanate (MDI). PEEUR samples were subjected to crosslinking with styrene in the presence of radical polymerization initiators: methyl ethyl ketone peroxide (MEKPO) or cobalt 2-ethyl cyclohexanoate (EtHCo). Crosslinked PEEUR were characterized by their physicochemical and mechanical properties. Tensile strength of crosslinked PEEURs was in the range 63-29 MPa, hardness values were from 92 to 97°ShA, and glass transition temperature was in the range 59-74°C. For PEEURs filled with biocides tensile strength was in the range 6,8-8,5MPa, hardness values were from 82 to 92°ShA, and glass transition temperature was in the range 57-72°C. Optical microscopic observations showed that the materials obtained were homogeneous in micrometric scale.

Keywords

  • polyurethane
  • antifouling protection
  • unsaturated oligo(alkylene ester-ether)diols
  • poly(esteretherurethane) s
  • styrene crosslinking
access type Uneingeschränkter Zugang

Cr/Fe Ratio by Xps Spectra of Magnetoelectropolished Aisi 316L SS Using Linear, Shirley and Tougaard Methods of Background Subtraction

Online veröffentlicht: 10 Jul 2013
Seitenbereich: 11 - 20

Zusammenfassung

Abstract

In the paper, the analyses of Fe2p3/2 and chromium Cr2p3/2 XPS spectra with fitting by symmetrical and asymmetrical line shapes as well as using Linear, Shirley and Tougaard Method of Background Subtraction are presented. The calculations are performed on AISI 316L SS biomaterial after magnetoelectropolishing MEP operation. It was found, the chromium-to-iron ratio after magnetoelectropolishing MEP for other analyses could be in the range from 2.2 to 6.2 depending on the line shapes as well as type of backgrounds used to XPS spectra fitting. The most important for comparison the surface layers concerning the Cr/Fe ratio is to use the same line shape and backgrounds for all analyses.

Keywords

  • XPS spectra fitting
  • Linear
  • Shirley
  • Tougaard Backgrounds
  • 316L SS
  • Magnetoelectropolishing MEP
  • Cr/Fe ratio
access type Uneingeschränkter Zugang

Optical Properties of ZnO Thin Film

Online veröffentlicht: 10 Jul 2013
Seitenbereich: 21 - 29

Zusammenfassung

Abstract

In this work, we studied with a Matlab program, some of optical properties of zinc oxide (ZnO) deposited on glass (SiO2). The parameters studied include the refraction index, extinction coefficient, optical band gap, and complex dielectric constant versus incident photon energy, and transmittance, absorbance and reflectance spectrum of ZnO thin film deposited on glass (SiO2) for different thickness. The films were found to exhibit high transmittance (75- 95%), low absorbance and low reflectance in the visible / near infrared region up to 1000 nm. However, the absorbance of the films was found to be high in the ultra violet region with peak around 380 nm.

Keywords

  • ZnO
  • Thin film
  • optical properties
  • Sol gel deposition
  • Matlab

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