印度采购需求：铋锭、铋粒、铋粉、碲化铋、三氧化二铋、电解钴

I'm looking to source a specific type of nanomaterial, particularly one that is around 70 nm in particle size. Could you please provide detailed technical specifications and photos of the product? I'd like to understand its structure, properties, and any potential applications it can serve. Additionally, I would appreciate it if you could include the pricing information, including any bulk order discounts or shipping costs. This info will help me make a timely decision regarding our procurement needs. Thanks!