There is ongoing debate about the exact mechanisms that cause diamond formation in the microwave plasma chemical vapor deposition (MPCVD) process. While it’s well established that methane (CH4) and hydrogen (H2)are the key gases Hydrogen etches away non-diamond (sp2) carbon, while carbon from CH₄ contributes to diamond (sp3) growth. Yet the exact carbon-containing species responsible for diamond growth ,whether CH3 radicals, C2 dimers, or other species are the dominant contributors are not known. It's also not clear what surface reactions and growth mechanisms contribute to growth and how these species attach to diamond surfaces and stabilize sp3 bonds. While the general scheme is agreed upon, the precise atomic and plasma-chemical pathways that make diamond grow in MPCVD[2] are still a topic of active research and debate. Here's what I think happens Hydrogenation of carbon structures adds H atoms to carbon.This process promotes sp3 hybridization in formerly sp2 ,sp carbons...
31 Oct 2025 I thank the Nikkei Forum for organising the future of space conference and sparking vibrant discussion on new opportunities in the space sector. International cooperation was one of the main goals of the program and I was pleased to learn that Japan was actively cultivating partnerships with the AU and UAE —two nations that have made their space aspirations quite clear and indicated interest to actively participate in the space economy. Space has been dominated by government and military organisations and Non space companies have played a minor role. It is important to change this but financial and technical challenges are prohibitive. Some companies like blue origin and virgin galactic have tried to create business cases out of space based tourism but it's too early to conclude whether their models will succeed or fail. As things stand telecom companies remain the only true private sector partner of the space industry. Human resource developmen...