I cannot really answer for Nigeria. However, the development of science in African countries is something in which many countries have interest now. This goes beyond physics (and particle physics in particular).
I personally have strong ties with U. Johannesburg, although I agree South Africa is probably different in terms of economy and political stability from the rest of the continent.
In addition, together with collaborators we will apply for funding to build a new master of science in corpuscular physics in Kinshasa in RDC. The idea here is to help (both financially and in terms of expertise) local people to build something sustainable on the long term. Why RDC and not another country? Well, few individuals do not have the strength to deploy their help everywhere, and choices (for good or bad reasons) have to be made. The reason behind the choice of Congo is related to existing links between the project investigator and this country.