化工学报
化工學報
화공학보
CIESC Jorunal
2015年
9期
3654-3660
,共7页
李春林%解华%刘娜%林柄承%刘中民
李春林%解華%劉娜%林柄承%劉中民
리춘림%해화%류나%림병승%류중민
介尺度%界面%制备%微流控%液滴%微球%单分散
介呎度%界麵%製備%微流控%液滴%微毬%單分散
개척도%계면%제비%미류공%액적%미구%단분산
mesoscale%interface%preparation%microfluidic%droplet%microsphere%monodisperse
均一尺寸微米功能材料在诸如高分子化学、医药化工、催化以及高效分离等领域都受到普遍关注.现有常规方法很难满足制备单分散、均一性的微米材料的要求.采用微流控技术,在微流控芯片内先生成液滴,然后再在线固化液滴的方法,制备了各种单分散、尺寸均一的微球.通过液滴界面受控导入沉淀剂到液滴中,当所含溶质为固化慢的硅溶胶时,生成实心微球,制备得到表面积达 572 m2·g?1、直径变异系数约为 2%的纳米孔道二氧化硅微球;当液滴内含沉淀固化较快的溶质,如 Zn、Fe、Cu,则可形成水合氧化物或者混合氧化物空心球微球;当含快沉淀也含慢速固化物质时,如含可溶性 Fe 的硅溶胶时,通过调控沉淀剂进入液滴的速度,也成功了制备了Fe 均匀分散在氧化硅内的混合氧化物微球.
均一呎吋微米功能材料在諸如高分子化學、醫藥化工、催化以及高效分離等領域都受到普遍關註.現有常規方法很難滿足製備單分散、均一性的微米材料的要求.採用微流控技術,在微流控芯片內先生成液滴,然後再在線固化液滴的方法,製備瞭各種單分散、呎吋均一的微毬.通過液滴界麵受控導入沉澱劑到液滴中,噹所含溶質為固化慢的硅溶膠時,生成實心微毬,製備得到錶麵積達 572 m2·g?1、直徑變異繫數約為 2%的納米孔道二氧化硅微毬;噹液滴內含沉澱固化較快的溶質,如 Zn、Fe、Cu,則可形成水閤氧化物或者混閤氧化物空心毬微毬;噹含快沉澱也含慢速固化物質時,如含可溶性 Fe 的硅溶膠時,通過調控沉澱劑進入液滴的速度,也成功瞭製備瞭Fe 均勻分散在氧化硅內的混閤氧化物微毬.
균일척촌미미공능재료재제여고분자화학、의약화공、최화이급고효분리등영역도수도보편관주.현유상규방법흔난만족제비단분산、균일성적미미재료적요구.채용미류공기술,재미류공심편내선생성액적,연후재재선고화액적적방법,제비료각충단분산、척촌균일적미구.통과액적계면수공도입침정제도액적중,당소함용질위고화만적규용효시,생성실심미구,제비득도표면적체 572 m2·g?1、직경변이계수약위 2%적납미공도이양화규미구;당액적내함침정고화교쾌적용질,여 Zn、Fe、Cu,칙가형성수합양화물혹자혼합양화물공심구미구;당함쾌침정야함만속고화물질시,여함가용성 Fe 적규용효시,통과조공침정제진입액적적속도,야성공료제비료Fe 균균분산재양화규내적혼합양화물미구.
Uniform size micromeres functional material gets a lot of attention in the fields of polymer chemistry, medicine and chemical industry, catalysis and separation. It is incovenient to prepare monodisperse and uniformity micrometer material by current conventional technology. With microfluidic technology, the droplet was generated in the chip and following to solidify the droplet online to prepare various of monodisperse and size uniformity microsphere. Since the droplet was a Si sol of slow-solidified, the nonporous SiO2 microsphere with a BET surface area of 572 m2·g?1 and a variance coefficient of microsphere diameters of about 2% were produced by introducing precipitator from the interface of droplet. Because the droplets were a material of fast-precipited, such as Zn, Fe, or Cu ion, a hollow microsphere consisted of hydrate oxide or mixed oxide was produced. As the droplet contains both materials of fast-precipitated and flow-solidified, such as Si sol containing of Fe ion, SiO2 microsphere with a homogeneous dispersed Fe in it was obtained by adjusting the introducing velocity of precipitator into the droplet.