scholarly journals Investigation of the Ultraviolet Irradiation on Blend Films of PS/PCL

2021 ◽  
Vol 6 (2) ◽  
pp. 29-33
Author(s):  
João de Deus Pereira De Moraes Segundo ◽  
Maria Oneide Silva De Moraes ◽  
Catarina Barbosa Levy ◽  
Walter Ricardo Brito
Keyword(s):  
Contact Angle ◽  
Ultraviolet Light ◽  
Room Temperature ◽  
Polymer Mixture ◽  
Blend Films ◽  
Mechanical Stirring ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Poly Caprolactone ◽  
Mechanical Rotation

In this work, an investigation was carried out on the effect of ultraviolet light on different films. Polystyrene (PS), poly (caprolactone) (PCL), and blended films of PS/PCL were produced. Ethyl acetate (AE) was used as a solvent, and PS and PCL solutions were prepared by dissolving 250 mg in 2.5mL of AE under mechanical stirring at room temperature. The blended solutions of PS/PCL (PS:PCL) were prepared with different mass proportions, such as 90:10, 80:20, 70:30, and 60:40 into 2.5 mL of EA. The solutions were dripped with 500 µL on a glass substrate, and the films were produced with mechanical rotation of N=2000 RPM for 15 seconds using a Spin coater. The films were submitted to ultraviolet light for t=60 minutes and morphologically analyzed by optical microscopy, chemically by IR spectroscopy, and superficially by contact angle and wettability; this last analysis also investigated the effect of ultraviolet light at t=0, t=30, and t=60 minutes. The exposure of ultraviolet light on the films affected its morphologies. IR spectra showed that the photodegradation increased for larger PCL amounts into the blend. The contact angle measurements showed that after exposure to ultraviolet light, the hydrophobicity of the films increased. Therefore, the presence of PCL in the polymer mixture promoted the photodegradation of the PS/PCL films, making it attractive for developing new packaging.

scholarly journals Removal of Triolein Lipid From Aqueous System by Molecularly Imprinted Chitosan and Its Derivative

KIMIKA ◽  
2018 ◽  
Vol 29 (1) ◽  
pp. 11-16
Author(s):  
Soma Chakraborty ◽  
Xyza Jane Templonuevo
Keyword(s):  
Contact Angle ◽  
Water Droplet ◽  
Room Temperature ◽  
Binding Capacity ◽  
Aqueous System ◽  
Molecularly Imprinted ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Palmitoyl Glycerol ◽  
Octanoyl Chloride

Chitosan was molecularly imprinted to remove triolein (a model lipid triacylglyceride) from water. Molecularly-imprinted chitosan (chitosan-MIP) was synthesized by crosslinking it with glutaraldehyde in the presence of triolein as the template at 50°C for 2h. MIPs of octanoyl derivative of chitosan(Oct-MIP) were also prepared by similar method. Octanoyl chitosan was synthesized by N-acylation of chitosan using octanoyl chloride at room temperature for 12h. Contact angle measurements of water droplet on chitosan and octanoyl chitosan revealed increased hydrophobicity of octanoyl derivative of chitosan. FTIR spectroscopy was used to characterize the derivative and the MIPs. All the synthesized polymers. Oct-MIP and chitosan-MIP could imprint approximately 77% and 66% of triolein template, respectively. Binding experiments revealed that Oct-MIP exhibit higher triolein binding capacity than corresponding non-acylated polymers. In 6h, 1mg of Oct-MIP and chitosan-MIP could rebind 534.50µg and 380.35µg of triolein respectively. Non Imprinted octanoyl chitosan and chitosan bound 272µg and 198.24µg triolein respectively. Both types of MIPs could also bind a triolein analog (1,3-dioleoyl-2-palmitoyl glycerol).

scholarly journals Biopolymeric Membrane Enriched with Chitosan and Silver for Metallic Ions Removal

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1792 ◽  
Author(s):  
Simona Căprărescu ◽  
Roxana Gabriela Zgârian ◽  
Graţiela Teodora Tihan ◽  
Violeta Purcar ◽  
Eugenia Eftimie Totu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Synthetic Wastewater ◽  
Polymeric Membrane ◽  
Polymer Mixture ◽  
Gravimetric Analysis ◽  
Iron Ions ◽  
Treatment Rate ◽  
Excellent Thermal Stability ◽  
Angle Measurements ◽  
Contact Angle Measurements

The present paper synthesized, characterized, and evaluated the performance of the novel biopolymeric membrane enriched with cellulose acetate and chitosan (CHI)-silver (Ag) ions in order to remove iron ion from the synthetic wastewater using a new electrodialysis system. The prepared membranes were characterized by Fourier Transforms Infrared Spectroscopy-Attenuated Total Reflection (FTIR-ATR), Thermal Gravimetric Analysis (TGA) and Differential Thermal Analysis (DSC), contact angle measurements, microscopy studies, and electrochemical impedance spectroscopy (EIS). The electrodialysis experiments were performed at the different applied voltages (5, 10, and 15 V) for one hour, at room temperature. The treatment rate (TE) of iron ions, current efficiency (IE), and energy consumption (Wc) were calculated. FTIR-ATR spectra evidenced that incorporation of CHI-Ag ions into the polymer mixture led to a polymer-metal ion complex formation within the membrane. The TGA-DSC analysis for the obtained biopolymeric membranes showed excellent thermal stability (>350 °C). The contact angle measurements demonstrated the hydrophobic character of the polymeric membrane and a decrease of it by CHI-Ag adding. The EIS results indicated that the silver ions induced a higher ionic electrical conductivity. The highest value of the iron ions treatment rate (>60%) was obtained for the biopolymeric membrane with CHI-Ag ions at applied voltage of 15 V.

Superhydrophobic RTV Silicone Rubber Coatings on Anodized Aluminium Surfaces

2012 ◽  
Vol 706-709 ◽  
pp. 2546-2551 ◽  
Author(s):  
Gelareh Momen ◽  
Masoud Farzaneh
Keyword(s):  
Contact Angle ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Water Contact ◽  
Angle Measurements ◽  
Atomic Force ◽  
Static Contact ◽  
Contact Angle Measurements ◽  
Rubber Coatings ◽  
Rtv Silicone Rubber

A superhydrophobic surface was elaborated using two inexpensive industrial processes: surface anodization in phosphoric acid and spin coating of the anodized surface by RTV silicone rubber. Scanning electron microscopy (SEM), atomic force microscopic (AFM) and water contact angle measurements have been performed to characterize the morphological features, and wettability of the surfaces. The water static contact angle of the elaborated surface reached 157 ° at room temperature. At supercool temperature (-10°C) the superhydrophobic coating showed an important delayed freezing time.

Wettability Determination by Equilibrium Contact Angle Measurements: Reservoir Rock- Connate Water System With Injection of CO2

2012 ◽  
Author(s):  
Narjes Shojaikaveh ◽  
Cas Berentsen ◽  
Susanne Eva Johanne Rudolph-Floter ◽  
Karl Heinz Wolf ◽  
William Richard Rossen
Keyword(s):  
Contact Angle ◽  
Water System ◽  
Reservoir Rock ◽  
Equilibrium Contact Angle ◽  
Connate Water ◽  
Angle Measurements ◽  
Contact Angle Measurements

Surface Wettability Enhances Osteoblast Adhesion on Silicon-Substituted Hydroxyapatite Thin Films

2007 ◽  
Vol 330-332 ◽  
pp. 877-880 ◽  
Author(s):  
E.S. Thian ◽  
J. Huang ◽  
Serena Best ◽  
Zoe H. Barber ◽  
William Bonfield
Keyword(s):  
Thin Films ◽  
Contact Angle ◽  
Actin Filaments ◽  
Culture Study ◽  
Cell Culture Study ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Osteoblast Adhesion ◽  
Lower Contact

Crystalline hydroxyapatite (HA) and 0.8 wt.% silicon-substituted HA (SiHA) thin films were produced using magnetron co-sputtering. These films were subjected to contact angle measurements and in vitro cell culture study using human osteoblast-like (HOB) cells. A wettability study showed that SiHA has a lower contact angle, and thus is more hydrophilic in nature, as compared to HA. Consequently, enhanced cell growth was observed on SiHA at all time-points. Furthermore, distinct and well-developed actin filaments could be seen within HOB cells on SiHA. Thus, this work demonstrated that the surface properties of the coating may be modified by the substitution of Si into the HA structure.

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