Yes, you can switch your car to synthetic oil at any time. Synthetic oil and conventional oil will mix without issues, so you don't have to worry about a little bit of old oil in the engine mixing with the synthetic and causing problems. Conventional oils can leave a lot of deposits and sometimes even sludge inside an engine. Synthetic oil will gradually dissolve most of these deposits. An engine with severe sludge problems may need more specialized attention, such as engine flush treatments or even a rebuild. Normal cars that have had regular maintenance will have no issues, though.
The journal publishes original research papers, short communications and reviews. Original research papers and short communications should present a significant advance in the understanding or application of these materials and/ or devices made from them. Experimental, theoretical and application papers on the chemistry, physics and engineering of these materials and their electrical, photonic and magnetic properties are encouraged for submission. Papers on electronic, optoelectronic, electroluminescent, lasing, solar cell, sensor, actuator, biological and other potential applications of these materials are also welcome.