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Jami'ar Kimiyya da Fasaha ta kasar Sin ta samar da wani nau'in nano-composite membrane don kare sararin samaniya

Lokaci:2021-12-13 Hits:

Saboda kyawun kayan aikin injin sa, kyakkyawan kwanciyar hankali na thermal da kuma juriya na sinadarai, fim din polyimide ya zama kyakkyawan abu don binciken sararin samaniya "tufafin kariya". Duk da haka, kamar sauran hydrocarbon polymers, Abubuwan polyimide suna da rauni ga harin iskar oxygen a cikin sararin samaniya, wanda ya haifar da koma baya a cikin abubuwan da suke da su na zahiri da na inji. A halin yanzu, babu mafita mai kyau ga wannan matsalar. Bugu da kari, matsananciyar yanayi kamar hasken hasken sararin samaniya da tasirin tarkacen sararin samaniya sun kuma haifar da gwaji mai tsanani ga kwanciyar hankali.


Yu Shuhong, malami a jami'ar kimiyya da fasaha ta kasar Sin kuma mamba a kwalejin kimiyyar kasar Sin, ya ɓullo da wani sabon polyimide-nano-mica haɗe-haɗe na membrane abu don aikace-aikacen kariya ta sararin samaniya. Kayan yana ɗaukar ƙirar bionic na musamman, kuma kayan aikin injinsa da juriya na matsanancin yanayin sararin samaniya suna inganta sosai. Masu bincike daga mahaifiyar halitta na lu'u-lu'u "- laka tubali tsarin Layer, ƙwararren ƙira wanda aka gina tare da tsarin Layer lu'u-lu'u nau'i biyu na polyimide - mica nano hada fim, sa saman rarraba yana da ƙarin fim ɗin mica nano, tare da taimakon abubuwan da ke cikin mica da fa'idodin ginin ginin, a cikin fahimtar kayan makanikai aikin ya karu sosai a lokaci guda, Juriya na saman Layer zuwa atomic oxygen, Hasken ultraviolet da tarkacen sararin samaniya kuma an inganta su sosai. Sakamakon binciken da ke da alaƙa ya nuna cewa fina-finai na Polyimide-mica Nanocomposite da aka yi da nacre-Layer biyu-Layer tare da Ingantacciyar Tsarin Injiniya don Yanayin Muhalli na LEO., a cikin Advanced Materials.


Commun., 2018, 9, 2974), wanda yana da kyawawan kayan aikin injiniya da aikin garkuwar UV kuma ana iya shirya shi da yawa, An haɗa tare da polyimide precursor don samun polyimide-mica nanocomposite membrane.. An yi amfani da mafi girman halayen mica don gyara rashi na polyimide. Daban-daban da tsarin tsarin monolayer na baya na nano-composite film yana kwaikwayon Layer lu'u-lu'u, a cikin wannan binciken, Ƙungiyar binciken ta gina fim ɗin polyimide-mica nano-composite tare da nau'i biyu kamar tsarin lu'u-lu'u ta hanyar fesa da maganin zafi., ta yadda saman Layer ya sami ƙarin m mica nano-sheet (Hoto A-F). Wannan dabarar ƙira ta sami ingantacciyar haɓakawa a cikin kayan aikin injiniya na kayan kuma yana sa saman samansa ya fi tsayayya da iskar oxygen, ultraviolet radiation da tarkace sarari.


Sakamakon ya nuna cewa ƙarfin ƙarfi, Matsalolin matasa da taurin saman sabon fim ɗin haɗe-haɗe sune 125 MPa, 2.2 GPA da 0.37 GPA, bi da bi, waxanda suke 45%, 100% kuma 68% sama da na fim ɗin polyimide mai tsabta (Hoto G). Saboda ƙayyadaddun tsarin uwar lu'u-lu'u mai Layer biyu da fa'idodin da ke tattare da mica nanosheets, Layer polyimide-mica composite membrane na Layer Layer biyu yana nuna juriya na iskar oxygen mafi girma (yawan yashwa ≈0.17×10-24 cm-3 Atom -1). Babu shakka ya fi fim ɗin polyimide mai tsabta, monolayer polyimide mica composite film tare da tsarin uwar-lu'u-lu'u da polyimide matrix composite abu da aka ruwaito a baya.. Bugu da kari, juriya ta uv tsufa (313 nm) da kuma high zafin jiki kwanciyar hankali (380 oC) an inganta su sosai idan aka kwatanta da fim ɗin PI mai tsabta.


Fim ɗin polyimide-mica nanocomposite tare da nau'i biyu kamar tsarin uwar-lu'u-lu'u ana sa ran maye gurbin fim ɗin polyimide-mica nanocomposite na yanzu a matsayin sabon abu mai tasiri don kare kariya na sararin samaniya a cikin ƙananan yanayi na orbit.. Dabarar ƙirar ƙirar ƙirar uwar lu'u-lu'u na musamman da aka tsara a cikin wannan binciken kuma yana ba da sabon ra'ayi don ƙira da gina sauran manyan nanocomposites..


Cibiyar kimiyyar dabi'a ta kasar Sin ta tallafa wa aikin binciken (Farashin NSFC) Ƙungiya Bincike Project/Maɓalli aikin, Cas Key Shirin Bincike na Kimiyyar Gabas, Babban Asusun Bincike na Jami'o'in Tsakiya, Ayyukan Ƙirƙirar Haɗin gwiwar Lardin Anhui da Asusun Haɗin gwiwar Radiation na Synchrotron na USTC.










Tsarin tsari na tsarin shiri na polyimide - nanometer mica bionic composite film da microstructure, inji Properties da atomic oxygen haƙuri




Rubutun ya danganta: https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202105299




(Source: Jami'ar Kimiyya da Fasaha ta kasar Sin)