New Advances in Chemical Research in 2021. Recommanded Product: beta-D-Glucose pentaacetate, Chemistry involves the study of all things chemical – chemical processes, chemical compositions and chemical manipulation – in order to better understand the way in which materials are structured, how they change and how they react in certain situations. 604-69-3, Name is beta-D-Glucose pentaacetate, SMILES is CC(O[C@H]1[C@H](OC(C)=O)[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)=O, belongs to dioxole compound. In a article, author is Garza, CM, introduce new discover of the category.
A great deal of resources has been invested by the semiconductor industry as a whole to make ready 157 nm as the next lithography technology node. Despite of all this effort serious infrastructure issues remain to be solved. Perhaps the first one is the availability of CaF2, but a close second is a suitable soft-pellicle material. It has been previously reported(1-4) that standard 193 nm materials, like Teflon AF(R) and Cytop(R), fail catastrophically upon exposure at 157 nm radiation; and that their transmission is very poor to non-existent. In this paper we report data showing that these materials have higher transmission and lifetimes than previously thought 2. The physical lifetime of Cytop(R) of nearly 500 J/cm(2) is remarkably high, although the transmission varies as a function dose suggesting physical and chemical changes from the onset. For Teflon AF(R) the transmission is a more complex function of exposure dose, suggesting competing mechanisms. From experiments run with PVDF (polyvinyl difluoride), we conclude that the widely reported photodarkening effect is due to the presence of hydrogen in close proximity to a fluorine atom. From IR spectra we conclude that the dioxole moeity in Teflon AF(R) undergoes a series of photochemical reactions that lead to the physical destruction of the polymer.
But sometimes, even after several years of basic chemistry education, it is not easy to form a clear picture on how they govern reactivity! 604-69-3, you can contact me at any time and look forward to more communication. Recommanded Product: beta-D-Glucose pentaacetate.
Reference:
1,3-Benzodioxole – Wikipedia,
,Dioxole | C3H4O2 – PubChem