Here I mentioned only Glass rod and silk cloth. This can be anything from triboelectric series. But, why should it happen? Why should different charges accumulate in two materials and then neutralized again when coming into contact? Why can't the charges gaining energy when rubbed get distributed in the same material itself? And, how this phenomenon happens in insulators?
Please have a look at the following references:
https://www.springer.com/cda/content/document/cda_downloaddocument/9783319400389-c1.pdf?SGWID=0-0-45-1585881-p180004145
https://en.wikipedia.org/wiki/Triboelectric_effect
https://aip.scitation.org/doi/abs/10.1063/1.5006634?journalCode=jap
Article Triboelectric Charging of Insulators—Evidence for Electrons ...
Interesting and convincing answers may be found at
DOI 10.1007/978-981-10-3815-0
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