scholarly journals LDPE Transformation by Exposure to Sequential Low-Pressure Plasma and TiO2/UV Photocatalysis

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2513
Author(s):  
Luis D. Gómez-Méndez ◽  
Luis C. Jiménez-Borrego ◽  
Alejandro Pérez-Flórez ◽  
Raúl A. Poutou-Piñales ◽  
Aura M. Pedroza-Rodríguez ◽  
...  
Keyword(s):  
Ph Value ◽  
Low Pressure ◽  
Low Density Polyethylene ◽  
Sequential Process ◽  
Pressure Plasma ◽  
Polar Groups ◽  
Complementary Effect ◽  
Static Contact ◽  
Low Pressure Plasma ◽  
Sequential Processes

Low-density polyethylene (LDPE) sheets (3.0 ± 0.1 cm) received sequential treatment, first by the action of direct-current low-pressure plasma (DC-LPP) with a 100% oxygen partial pressure, 3.0 × 10−2 mbar pressure, 600 V DC tension, 5.6 cm distance, 6-min treatment. Then, sheets were submitted to TiO2 photocatalysis at UV radiation at 254 nm (TiO2/UV) with a pH value of 4.5 ± 0.2 and a TiO2 concentration of 1 gL−1. We achieved a complementary effect on the transformation of LDPE films. With the first treatment, ablation was generated, which increased hydrophilicity. With the second treatment, the cavities appeared. The changes in the LDPE sheets’ hydrophobicity were measured using the static contact angle (SCA) technique. The photocatalytic degradation curve at 400 h revealed that the DC-LPP photocatalysis sequential process decreased SCA by 82°. This was achieved by the incorporation of polar groups, which increased hydrophilicity, roughness, and rigidity by 12 and 38%, respectively. These sequential processes could be employed for LDPE and other material biodegradation pretreatment.

Low-pressure plasma enhanced immobilization of chitosan on low-density polyethylene for bio-medical applications

2015 ◽  
Vol 328 ◽  
pp. 1-12 ◽  
Author(s):  
K. Navaneetha Pandiyaraj ◽  
Ana Maria Ferraria ◽  
Ana Maria Botelho do Rego ◽  
Rajendra. R. Deshmukh ◽  
Pi-Guey Su ◽  
...  
Keyword(s):  
Low Pressure ◽  
Low Density Polyethylene ◽  
Medical Applications ◽  
Low Density ◽  
Pressure Plasma ◽  
Low Pressure Plasma

Surface modification of low-density polyethylene with poly(2-ethyl-2-oxazoline) using a low-pressure plasma treatment

Vacuum ◽  
2014 ◽  
Vol 100 ◽  
pp. 53-56 ◽  
Author(s):  
A. Popelka ◽  
J. Kronek ◽  
I. Novák ◽  
A. Kleinová ◽  
M. Mičušík ◽  
...  
Keyword(s):  
Surface Modification ◽  
Plasma Treatment ◽  
Low Pressure ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Pressure Plasma ◽  
Low Pressure Plasma

Characteristics of Low Pressure Plasma Sprayed Alumina Coating

2009 ◽  
Vol 24 (1) ◽  
pp. 117-121 ◽  
Author(s):  
Chun-Ming DENG ◽  
Ke-Song ZHOU ◽  
Min LIU ◽  
Chang-Guang DENG ◽  
Jin-Bing SONG ◽  
...  
Keyword(s):  
Low Pressure ◽  
Alumina Coating ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed

scholarly journals Effect of Low-Pressure Plasma Treatment Parameters on Wrinkle Features

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3852
Author(s):  
Bongjun Gu ◽  
Dongwook Ko ◽  
Sungjin Jo ◽  
Dong Choon Hyun ◽  
Hyeon-Ju Oh ◽  
...  
Keyword(s):  
Power Flow ◽  
Treatment Time ◽  
Argon Plasma ◽  
Negative Ions ◽  
Low Pressure ◽  
Nitrogen Plasma ◽  
Pressure Plasma ◽  
Positive Ions ◽  
Low Pressure Plasma ◽  
Optical Adhesive

Wrinkles attract significant attention due to their ability to enhance the mechanical and optical characteristics of various optoelectronic devices. We report the effect of the plasma gas type, power, flow rate, and treatment time on the wrinkle features. When an optical adhesive was treated using a low-pressure plasma of oxygen, argon, and nitrogen, the oxygen and argon plasma generated wrinkles with the lowest and highest wavelengths, respectively. The increase in the power of the nitrogen and oxygen plasma increased the wavelengths and heights of the wrinkles; however, the increase in the power of the argon plasma increased the wavelengths and decreased the heights of the wrinkles. Argon molecules are heavier and smaller than nitrogen and oxygen molecules that have similar weights and sizes; moreover, the argon plasma comprises positive ions while the oxygen and nitrogen plasma comprise negative ions. This resulted in differences in the wrinkle features. It was concluded that a combination of different plasma gases could achieve exclusive control over either the wavelength or the height and allow a thorough analysis of the correlation between the wrinkle features and the characteristics of the electronic devices.

scholarly journals Effect of H2O-Based Low-Pressure Plasma (LPP) Treatment on the Germination of Bambara Groundnut Seeds

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 338
Author(s):  
Naeem Ahmed ◽  
Asad Masood ◽  
Kim S. Siow ◽  
M. F. Mohd Razip Wee ◽  
Rahmat Zaki Auliya ◽  
...  
Keyword(s):  
Food Security ◽  
Seed Germination ◽  
Chemical Modification ◽  
Low Pressure ◽  
Germination Percentage ◽  
Bambara Groundnut ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Amine Groups

In general, seed germination is improved by low-pressure plasma (LPP) treatment using precursors such as air, nitrogen, argon, or water (H2O). Here, H2O-based LPP treatment using the optimized parameters of 10 W and 10 s improves the germination of Bambara groundnut seeds by 22%. LPP increases the wettability and roughness of the seed hilum while oxidizing the surface with carboxyl and amine groups. In this H2O-based treatment of Bambara groundnut seeds, combinatory etching and chemical modification facilitated the imbibition process and increased the germination percentage. The success of this method has the potential to be scaled up to solve food security with seeds otherwise facing germination-related issues.

On the adhesion of diamond‐like carbon coatings deposited by low‐pressure plasma on 316L stainless steel

2021 ◽  
Author(s):  
Gabriel Morand ◽  
Pascale Chevallier ◽  
Linda Bonilla‐Gameros ◽  
Stéphane Turgeon ◽  
Maxime Cloutier ◽  
...  
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Low Pressure ◽  
Diamond Like Carbon ◽  
Carbon Coatings ◽  
Pressure Plasma ◽  
Low Pressure Plasma
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