The laser ablation process has been presented as a state-of-the-art and robust method for eliminating surface layers of metallic bulk materials on the micro/nanoscale with considerable accuracy and speed. These capabilities make it an ideal instrument for the primary step of metallic bulk sample preparation for transmission electron microscopy (TEM) analysis with minimal damage to the crystal structure of the sample. This work prepared a pure aluminum plate by fiber laser scanning immersed in a 5 % perchloric acid and 95 % ethanol (by volume) solution. The laser ablation in an acidic liquid condition was used in the chemical etching process, to prevent oxidation, minimize the heat-affected region, and induce crystalline defects. For this purpose, a continuous wave fiber laser with a power of 100 W, a wavelength of 1064 nm, and a focusing distance of 305 mm was applied. The TEM analysis for the as-prepared sample by the laser ablation process was compared to the standard jet electro-polishing method in the same solution. The results showed that crystal structure variations such as grain size and lattice defects did not occur in the aluminum sample due to the thermal effects of the laser ablation process. The average size of the grains and zone axis were about 600-800 nm and z = [011], respectively, in as-prepared samples by both methods; In addition, very few dislocations were observed in the grain boundaries and inside the grains. Therefore, based on the obtained results, laser ablation could be considered an eco-friendly, comfortable, fast, and cost-effective method with a small volume of chemicals used, compared to the standard jet electro-polishing method for the TEM preparation of the metallic bulk samples.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1016/j.micron.2023.103535 | DOI Listing |
Laryngoscope
January 2025
Department of Otolaryngology-Head and Neck Surgery, Louisiana State University Health Sciences Center, Shreveport, Louisiana, U.S.A.
Objective: To identify the most effective treatment modality for achieving favorable outcomes in early glottic tumors with anterior commissure involvement (ACI).
Data Sources: PubMed, Embase, Web of Science, and ScienceDirect.
Review Methods: Random-effects proportional meta-analysis model is used to evaluate the oncological and functional outcomes of transoral laser microsurgery (TLM) versus radiation therapy (RT) in early glottic (T1-T2) cancer with ACI.
J Clin Med
January 2025
2nd Chair and Department of Gynecology, Medical University of Lublin, Jaczewskiego 8, 20-954 Lublin, Poland.
Genitourinary Syndrome of Menopause (GSM) is a prevalent condition in postmenopausal women characterized by symptoms such as vaginal dryness, itching, and urinary tract issues due to declining estrogen levels. Despite its widespread impact on quality of life, GSM often remains underdiagnosed and without effective treatment. This study assessed the long-term efficacy of fractional CO laser treatment in alleviating GSM symptoms in perimenopausal women.
View Article and Find Full Text PDFSensors (Basel)
December 2024
Mines Saint-Etienne, Centre CMP, Département BEL, F-13541 Gardanne, France.
The primary method of treatment for patients suffering from drug-resistant focal-onset epilepsy is resective surgery, which adversely impacts neurocognitive function. Radio frequency (RF) ablation and laser ablation are the methods with the most promise, achieving seizure-free rates similar to resection but with less negative impact on neurocognitive function. However, there remains a number of concerns and open technical questions about these two methods of thermal ablation, with the primary ones: (1) heating; (2) hemorrhage and bleeding; and (3) poor directionality.
View Article and Find Full Text PDFInt J Mol Sci
December 2024
Department of Internal Medicine, Angiology and Physical Medicine, Center for Laser Diagnostics and Therapy, Medical University of Silesia in Katowice, Batorego 15 Street, 41-902 Bytom, Poland.
Inflammatory bowel disease (IBD) is an immune disorder of the gastrointestinal tract with a complex aetiopathogenesis, whose development is influenced by many factors. The prevalence of IBD is increasing worldwide, in both industrialized and developing countries, making IBD a global health problem that seriously affects quality of life. In 2019, there were approximately 4.
View Article and Find Full Text PDFInt J Mol Sci
December 2024
Laboratory for Functional and Metabolic Imaging (LIFMET), Institute of Physics, Swiss Federal Institute of Technology (EPFL), Station 3, 1015 Lausanne, Switzerland.
Photobiomodulation (PBM) therapy, a therapeutic approach utilizing low-level light, has garnered significant attention for its potential to modulate various biological processes. This study aimed at optimizing and investigating the effects of PBM on angiogenesis and mitochondrial metabolic activity. In vitro experiments using human umbilical vein endothelial cells (HUVECs) and vascular smooth muscle cells (VSMCs) were performed to assess PBM's impacts on cell migration, proliferation, endogenous protoporphyrin IX production, mitochondrial membrane potential, Rhodamine 123 fluorescence lifetime, mitochondrial morphology, and oxygen consumption.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!