Effects of the preparation conditions on ethylene/vinyl acetate membrane morphology with the use of scanning electron microscopy

2007 ◽  
Vol 105 (5) ◽  
pp. 2683-2688 ◽  
Author(s):  
M. Sadeghi ◽  
S. A. Mousavi ◽  
M. Y. Motamed Hashemi ◽  
M. Pourafshari Chenar ◽  
R. Roosta Azad
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Preparation Conditions ◽  
Membrane Morphology ◽  
Scanning Electron

scholarly journals Separation of Zn(II), Cr(III), and Ni(II) Ions Using the Polymer Inclusion Membranes Containing Acetylacetone Derivative as the Carrier

Membranes ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 88 ◽  
Author(s):  
Elzbieta Radzyminska-Lenarcik ◽  
Ilona Pyszka ◽  
Malgorzata Ulewicz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Transport Process ◽  
Membrane Composition ◽  
Force Microscopy ◽  
Membrane Morphology ◽  
Atomic Force ◽  
Feed Phase ◽  
Scanning Electron

Polymer inclusion membranes (PIMs) doped with ethylenodiamino-bis-acetylacetone as fixed carrier was applied for the investigation of the facilitated transport of Zn(II), Cr(III), and Ni(II) ions from an aqueous nitrate feed phase (cM = 0.001 mol/dm3). The optimal membrane composition (amount of carrier and o-NPPE-plasticizer) was determined. For the optimal polymer inclusion membranes doped with ethylenodiamino-bis-acetylacetone, the following patterns of transport selectivity were found: Zn(II) > Cr(III) > Ni(II). The initial flux of Zn(II), Cr(III), and Ni(II) ions was 6.37 µmol/m2∙s, 5.53 µmol/m2∙s, and 0.40 µmol/m2∙s, respectively. The selectivity coefficients equal to 1.2 and 15.9 were found for Zn(II)/Cr(III) and Zn(II)/Ni(II), respectively. After 24-h transport, the recovery factor of Zn(II), Cr(III), and Ni(II) were 90%, 65%, and 6%, respectively. The polymer inclusion membranes doped with ethylenodiamino-bis-acetylacetone were characterized by scanning electron microscopy and non-contact atomic force microscopy. The influence of membrane morphology on transport process was discussed.

STUDY OF Y-Ba-Cu-O SUPERCONDUCTORS PREPARED WITH THE OXALATE PRECIPITATION/EVAPORATION METHOD

1990 ◽  
Vol 04 (19) ◽  
pp. 1237-1244 ◽  
Author(s):  
TH. LEVENTOURI ◽  
E. LIAROKAPIS ◽  
L. MARTINEZ ◽  
F.D. MEDINA ◽  
M. MORENO ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Magnetic Measurements ◽  
Preparation Procedure ◽  
X Rays ◽  
Evaporation Method ◽  
Preparation Conditions ◽  
Oxalate Precipitation ◽  
Scanning Electron

A study is presented on a series of Y-Ba-Cu-O superconductors prepared with the Oxalate Precipitation/Evaporation method. The effect of the preparation conditions on the properties of these superconductors has been studied with X-rays, scanning electron microscopy, Raman spectroscopy, and magnetic measurements. The experiments show that good quality superconductors can be fabricated with this preparation procedure and also indicate that the properties of these materials are very sensitive to the preparation conditions.

scholarly journals Influence of Processing Type in the Morphology of Membranes Obtained from PA6/MMT Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Rodholfo da Silva Barbosa Ferreira ◽  
Caio Henrique do Ó Pereira ◽  
Rene Anisio da Paz ◽  
Amanda Melissa Damião Leite ◽  
Edcleide Maria Araújo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
X Ray ◽  
Membrane Morphology ◽  
Twin Screw ◽  
Microscopy Images ◽  
Scanning Electron

The nanocomposites have an extensive use in the current process of membrane preparation, taking into account their unique features as membranes. Thus, the study of nanocomposite processing to obtain membranes is highly important. In this work, Brazilian clay was used (Brasgel PA) for the preparation of polyamide/clay nanocomposite. The nanocomposites were produced in a high rotation homogenizer and in a twin screw extruder. From the nanocomposites and pure polymers processed in the two equipments, membranes were prepared by the immersion-precipitation method, using formic acid as solvent. By X-ray diffraction (XRD), the formation of exfoliated and/or partially exfoliated structures with changes in the crystalline phases of the polyamide was observed. From scanning electron microscopy images, it was observed that the processing clearly influenced the membrane morphology.

Analysis of Novel Structure of EVA/Hemp Stem Powder Foam Materials

2012 ◽  
Vol 627 ◽  
pp. 651-654
Author(s):  
Xin Min Hao ◽  
Wen Juan Ma ◽  
Ge Gan ◽  
Peng Cheng Zhao ◽  
Yuan Yang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Ethylene Vinyl Acetate ◽  
Compound System ◽  
Scanning Calorimetry ◽  
Novel Structure ◽  
Ft Ir ◽  
Scanning Electron

This paper introduces the study of structure on EVA (ethylene-vinyl acetate)/hemp stem powder compound system. The micro behavior of EVA/hemp system was measured by SEM (Scanning Electron Microscopy), and its thermal properties were measured by DSC (Differential Scanning Calorimetry ). It indicates that hemp stem core has entered into EVA foaming system successfully when measured by FT-IR (Fourier Transform Infrared).

scholarly journals Textured Breast Implants: A Closer Look at the Surface Debris Under the Microscope

2017 ◽  
Vol 25 (3) ◽  
pp. 179-183 ◽  
Author(s):  
Leland H. Webb ◽  
Victoria L. Aime ◽  
Annie Do ◽  
Kenneth Mossman ◽  
Raman C. Mahabir
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particulate Matter ◽  
Breast Implants ◽  
Ethylene Vinyl Acetate ◽  
Microscopy Imaging ◽  
Dynamic Surface ◽  
External Shell ◽  
Eva Copolymer ◽  
Scanning Electron

Background: Texturing of breast implants is done to decrease the risk of associated complications. Each manufacturer utilizes unique and at times proprietary techniques to texture the surface of their implants. Little is known about the integrity of this surface structure texturing or the propensity for the surfaces to shed particulate matter. This study aimed to determine the extent of surface particulate shedding from 3 textured implants approved by the US Food and Drug Administration (FDA), which are manufactured by Allergan, Mentor, and Sientra. Methods: Control images of each of the 3 textured breast implants were obtained with scanning electron microscopy (SEM). A liquid adhesive, ethylene vinyl acetate (EVA) copolymer was then applied to the external shell of the implants, allowed to cool, and peeled from the surface. Images of the EVA copolymer were taken with SEM to qualitatively analyze displacement of surface particulate debris. Scanning electron microscopy imaging of the implants was repeated for qualitative comparisons with the control images. Results: The peeled copolymer of the 3 implants exhibited surface shedding. Comparison of the 3 breast implants showed the shedding to be greatest for the Allergan implant. Conclusions: This study highlights the dynamic surface material properties of the 3 FDA-approved breast implants. Shedding of particulate matter from the implant surfaces can be precipitated by moderate adhesion. Our qualitative examination of SEM findings showed more debris shed from the Allergan breast implants than from the Mentor or Sientra implants.

scholarly journals Microstructural evolution of an iron silicate catalyst with thermal and hydrothermal treatments

1988 ◽  
Vol 46 ◽  
pp. 710-711
Author(s):  
Roseann Csencsits
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Molecular Sieve ◽  
Iron Silicate ◽  
Second Phase ◽  
Particle Sizes ◽  
Fischer Tropsch ◽  
Preparation Conditions ◽  
Alumino Silicate ◽  
Scanning Electron

Iron silicate analogs of the zeolite ZSM-5 may be directly synthesized from iron silicate gels in a manner which differs slightly from the alumino-silicate ZSM-5. The resultant white, crystalline iron silicate is referred to as FeZSM-5 in the as-synthesized form. Thermal treatment removes the organic crystal-directing agent and moves some of the framework iron into non-framework sites producing the calcined form of the molecular sieve FeZSM-5. Subsequent hydrothermal treatment moves more of the iron out of the molecular sieve framework. This iron-rich second phase and the ZSM-5 pore structure can be used to convert synthesis gas (CO and H2) to “gasoline range” hydrocarbons and water (Fischer-Tropsch synthesis). To optimize the Fischer-Tropsch catalyst, homogeneity in the particle size distribution and in the distribution of catalytic iron throughout the particles is desired.Scanning electron microscopy (SEM) was used to characterize the overall molecular sieve particle sizes and morphologies as a function of preparation conditions.

Chromium (III) Removal by Epoxy-Cross-Linked Polyethersulfone Ultrafiltration Membrane

2014 ◽  
Vol 70 (2) ◽  
Author(s):  
M. J. J. Erniza ◽  
S. C. Low
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Field Emission ◽  
Morphological Study ◽  
Separation Efficiency ◽  
Permeate Flux ◽  
Blend Membrane ◽  
Membrane Morphology ◽  
Blend Membranes ◽  
Scanning Electron

This study attempts to correlate the changes in membrane morphology with the separation efficiency of the polyethersulfone/epoxy resin (PES/ER) blend membranes. Intermolecular interactions between the components in PES/ER blend membranes were established by ATR-FTIR and the morphological study by field emission scanning electron microscopy (FESEM) has confirmed the significant changes of pores connectivity between the sub-layers of membrane. PES/ER blend membrane with 10% of ER revealed highest rejection of Cr(III) ions at 85% without jeopardizing the permeate flux (12.17 L/m2h). From the results, it could be concluded that the PES/ER blend membrane has the great potential in the removal of chromium ions from an aqueous waste. 

Tensile Properties and Morphology of Polyamide 6 (PA6)/Ethylene Vinyl Acetate (EVA)/Sepiolite Nanocomposite

2015 ◽  
Vol 735 ◽  
pp. 61-64 ◽  
Author(s):  
N.M. Fauzi ◽  
Zurina Mohamad
Keyword(s):  
Electron Microscopy ◽  
Polymer Nanocomposites ◽  
Vinyl Acetate ◽  
Tensile Testing ◽  
Domain Size ◽  
Ethylene Vinyl Acetate ◽  
Polyamide 6 ◽  
Screw Extruder ◽  
Twin Screw ◽  
Scanning Electron

This study was conducted in order to develop the new polymer nanocomposites. In this case, sepiolite was incorporated into Polyamide 6 (PA6) / Ethylene vinyl acetate (EVA) blend. The main aim of this research is to examine the effect of sepiolite concentration on the properties of PA6/EVA/sepiolite nanocomposite. The variations of sepiolite (2 – 10 phr) were added into PA6/EVA blend at the ratio of 80/20 wt%. The nanocomposites were prepared using twin screw extruder and injection moulding. Mechanical properties of PA6/EVA/sepiolite nanocomposite were analyzed by tensile testing and it was revealed that there is no change in stiffness and decrease in strength with more sepiolite content. Meanwhile, the morphology of materials was characterized by field emission scanning electron microscopy (FESEM). The morphology revealed that, the dispersion of sepiolite nanofiller seems to be good and the EVA domain size and distribution was effected by sepiolite content.

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