1. He aha ka mea metala nanoporous?
ʻO Nanoporous Metals (NPM) he papa o nā mea metala me nā ligaments i hoʻopili ʻia (curvature maikaʻi) a me nā kahawai nanoporous (negative curvature), ka porosity ʻaʻole i emi iho ma mua o 50%, a me nā pores submicron (E komo pū me nā micropores, mesopores a me nā macropores me nā diameters. o 50-1000 nm) he koʻikoʻi koʻikoʻi i ka ʻāpana kiko o ka ʻūhā. E like me ka mea i hōʻike ʻia ma ka Figure 1, pono ka nui o ka pore i ka nanometer!
Ka helu ʻana o nā mea porous o nā ʻano nui like ʻole (mai ka hema a i ka ʻākau, e hoʻonui ana i ka nui)
Ma ka ʻōlelo maʻamau, ʻo ka synthesis o nā nanometals porous ka mea nui ma o ka top-down free chemical corrosion dealloying a me ka electrochemical dealloying, a hiki ke hoʻomākaukau ʻia e ka lalo-up synthesis me ka hoʻohana ʻana i ke ʻano template. Maanei mākou e kamaʻilio nui ai e pili ana i ke ʻano o ka hoʻomākaukau ʻana no ka hoʻomākaukau ʻana i nā metala porous. No kekahi mau mea i hoʻohana mau ʻia a hoʻohana ʻia, ʻo nā ʻāpana ʻelua/nui nā ʻāpana i hiki ke hoʻohana ʻia no ka dealloying pono e hoʻokō i kēia mau helu: 1. Pono e ʻokoʻa ka hiki ke kaulike ma waena o nā ʻāpana; 2. ʻO ka ratio maʻiʻo o nā ʻāpana Aia kahi paepae; 3. Hiki ke hoʻokumu ʻia kahi pae hoʻonā paʻa hoʻokahi.
ʻO ka IUPAC Periodic Table of Elements, nā pahu ʻulaʻula a me ka polū ka mea maʻamau i hoʻohana ʻia i nā mea metala
Eia hou, hiki i ka mahele nanopore o nā metala nanoporous ke ʻano like ʻole a i ʻole like ʻole, ʻoiaʻiʻo, aia nā mea ʻelua i ka hapa nui. I kēia manawa, hilinaʻi ka crystallographic orientation a me nā hemahema aniani o nā metala nanoporous i ka microstructure o nā alloy precursors a me ke kaʻina hana o ka dealloying. Ma muli o ka microstructure kūʻokoʻa, hiki i nā metala nanoporous ke hōʻike i nā waiwai o nā metala a me nā mea nanostructured, a ua pili ko lākou mau hale i ka uila, magnetic, optical, mechanical, catalytic and electrocatalytic properties.
a). TEM o np-AuAg, b) kŘkohu hana hou 3D
2. ʻO nā hiʻohiʻona microscopic o nā metala nanoporous?
Ma ke kumumanaʻo, hoʻokahi a ʻoi aku paha o kēia mau ʻano hana ʻekolu e hana ana i ka wā e hoʻoheheʻe maikaʻi ʻia kahi metala.
(1) Hoʻopili ʻia nā metala ʻelua, a laila waiho hou ʻia ka metala makamae;
(2) ʻO ka metala kumu wale nō ka ionized a komo i ka hopena, aʻo nā ʻātoma o ka metala hanohano e hōʻuluʻulu ʻia e ka diffusion ili;
(3) ʻO ka metala kumu wale nō ka ionizes a komo i ka hopena, a neʻe nā ʻātoma o nā metala ʻelua i ka pae paʻa ma o ka hoʻopuehu nui.
Ka manawa hoʻouna: Feb-14-2022
