THE EFFECT OF CONICAL AND SPHERICAL SHAPE OF DIMPLE’S BOTTOM PROFILE FABRICATED ON THE SHAFT SURFACE IN JOURNAL BEARING

Abstract

Nanoporous anodised aluminium (NAA) is a valuable substance characterised by a uniform pore structure, exceptional chemical stability, and robust mechanical qualities. It possesses extensive applicability in biology, energy, sensing, and optics. This research initially examines the historical development of NAA, elucidates the fundamental principles of its formation process, and elucidates the mechanism underlying its distinctive structure. This study systematically analyses the impact of key parameters—oxidation voltage, oxidation temperature, electrolyte type, and concentration—on the anodization process and their effects on the structural characteristics of NAA, including pore size, pore spacing, and oxide film thickness. The comparison of outcomes from various preparation circumstances elucidates the approach for optimising the procedure to get the desired structure. This research delineates the unique applications of NAA in the biomedical domain, encompassing drug carriers, tissue engineering, and antibacterial coatings, while also categorising its use in energy conversion and storage, including osmotic energy conversion and battery augmentation. The advanced developments of NAA in humidity, gas, and optical sensors are thoroughly examined, particularly their potential applications in the creation of photonic crystals, photocatalysis, and random laser platforms. This article anticipates the future trajectory of NAA, identifies its technical challenges and research priorities concerning large-scale preparation, precise structural control, and multifunctional applications, and offers a theoretical foundation and practical guidance for further investigation in this domain.