A Lower-Energy Pathway for the Creation of Multifunctional Silicon Suboxide Films

Materials, Journal Year: 2025, Volume and Issue: 18(5), P. 962 - 962

Published: Feb. 21, 2025

The possibility of inducing structural crosslinking and densification plasma-deposited SiOx networks by controlling low-energy reaction mechanisms was investigated. For this, films were deposited for 300 s from HMDSO (2%), O2 (86%) Ar (12%) mixtures at a working pressure 15.7 Pa. A radiofrequency signal used to excite the plasma in configuration so as not deliberately induce ion bombardment growing layers. excitation power varied (100 W) promote changes deposition mechanisms, which investigated rate layer thickness, chemical structure, elemental composition, topography, roughness, hardness, elastic modulus, corrosion potential, current density porosity films. Under experimental conditions studied, inorganic thin (x = 1.8–1.9) with low carbon content deposited. increase applied during process reduced number silanol groups coatings, due dangling bonds recombination crosslinks, avoided hydroxyl incorporation formation. As consequence, structure became harder, more compact resistant.

Language: Английский

---

Electric Field Effect of the Plasma-Initiated Polymerization of Methyl Methacrylate: A Negatively Charged Long-Lived Radical

Polymers, Journal Year: 2024, Volume and Issue: 16(11), P. 1497 - 1497

Published: May 24, 2024

Plasma-initiated polymerization (PIP) is generally attributed to a radical process due its inhibiting property. However, unique behaviors like long-lived and solvent effect do not comply well with the traditional mechanism. Herein, PIP of methyl methacrylate (MMA) was conducted in high-voltage DC electric field investigate charged nature radicals. Consequently, presented preferential distribution polymers at anode but cathode, revealing negatively growing An acceleration phenomenon, accompanied by growth molecular weights reduction weight distributions (Ð), observed voltages above 16 kV, suggesting dissociation ion pairs The yielded PMMA analogous chemical steric structures those from initiation, whether presence or absence external field. This work offers new insights into vinyl monomers, wherein one-electron transfer reaction inferred be involved monomer activation.

Language: Английский

---

Surface Analysis of Stainless Steel Electrodes Cleaned by Atmospheric Pressure Plasma

Materials, Journal Year: 2024, Volume and Issue: 17(14), P. 3621 - 3621

Published: July 22, 2024

The Z-pinch device is a critical component in inertial confinement fusion, where stainless steel electrodes must withstand high current densities of up to MA/cm2. Gases and difficult-to-remove impurities adhering the electrode surfaces can ionize, significantly impacting device’s electrical conductivity efficiency. In this paper, surface was subjected cleaning using large-area plasma jet under atmospheric pressure. wettability, chemical composition, state were characterized water contact angle measuring instrument X-ray photoelectron spectroscopy (XPS). effect different discharge parameters systematically analyzed. results revealed significant reduction content carbon pollutants on electrodes, decreasing from 62.95% minimum 37.68% after cleaning. Moreover, decreased 70.76° 29.31°, molecules adsorbed 17.31% 5.9%. Based evolution process micro-element electrode, substances by pressure analyzed layered model for steel.

Language: Английский

---

In situ atmospheric cold micro-PECVD of uniform superhydrophobic silica on internal surface of tubes for improving anti-corrosion and anti-impact behaviors

Surface and Coatings Technology, Journal Year: 2024, Volume and Issue: unknown, P. 131640 - 131640

Published: Dec. 1, 2024

Language: Английский

---