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¡¡¡¡Õª    Òª£º¡¡·Ðʯßäßòõ¥¹Ç¼Ü²ÄÁÏ(Zeolitic Imidazolate Framework-8, ZIF-8)ÊÇÓÉпÀë×ÓÓë2-¼×»ùßäßòÅäλ×Ô×é×°³ÉµÄ¶à¿×½á¾§²ÄÁÏ,Æä±È±íÃæ»ý´ó¡¢¿×϶Âʸߡ¢ºÏ³É±ã½Ý¡¢³ß´ç¿É¿Ø,ÔÚ¹¦ÄÜÎïÖʵİü·âÓëÊäÔËÖоßÓÐÍ»³öµÄÓÅÊÆ¡£Óë´Ëͬʱ,ÕâÀà²ÄÁϸü¾ß±¸ÓÅÒìµÄÉúÎïÏàÈÝÐÔ,ÇÒÆä½á¹¹ÔÚÉúÀíÌõ¼þϾßÓÐÁ¼ºÃµÄÎȶ¨ÐÔ,¶øÔÚËáÐÔÌõ¼þϽâÌå,¶ÔÓÚÓë¶ñÐÔÖ×ÁöµÈ¶àÖÖ¼²²¡Ïà¹ØµÄÈõËáÐÔ»·¾³¾ßÓÐÏìÓ¦ÐÔ,ÊÇ¿ØÖÆÒ©ÎïÔËÊäÓëÊͷŵÄÀíÏëÔØÌå,Òò¶øÔÚÉúÎïҽѧÉÏÓкܴóµÄÓ¦ÓÃDZÁ¦¡£ÊÂʵÉÏ,ZIF-8²»µ«ÄܸßЧ¸ºÔØ°¢Ã¹ËØ¡¢5-·úÄòà×वÈС·Ö×Ó»¯ÁÆÒ©Îï,¶øÇÒ¿ÉÒԳ䵱¿¹Ìå¡¢ºËËáµÈÉúÎï´ó·Ö×ӵı£»¤²ã¡£ZIF-8µÄÁ£¾¶µÈÐÔÄܶÔÓÚÏàÓ¦µÄÉúÎïҽѧӦÓ÷dz£¹Ø¼ü,¶øÈçºÎʵÏÖZIF-8¹¦ÄÜÐԵľ«×¼µ÷¿Ø½«ÊÇʵÏÖÆäÉúÎïҽѧӦÓõÄÖØÒªÌôÕ½,»ùÓÚ´Ë,±¾ÎľÍZIF-8µÄÖƱ¸»úÀí¡¢ÐÔÄܵ÷¿Ø¼°ÆäÉúÎïҽѧӦÓýøÐÐ×ÛÊöºÍÕ¹Íû¡£

¡¡¡¡¹Ø¼ü´Ê£º¡¡ZIF-8; ºÏ³É»úÀí; Á£¾¶µ÷¿Ø; ÈõËáÐÔ»·¾³Ãô¸Ð; ÉúÎïҽѧӦÓÃ;

¡¡¡¡Abstract£º¡¡Zeolitic imidazolate framework-8(ZIF-8) is a class of porous crystalline materials formed by the self-assembly of zinc ions and 2-methylimidazole. It shows potential advantages in encapsulation and transportation of functional materials owing to its high porosity, large specific surface,convenient synthesis and controllable size. More importantly, ZIF-8 is an ideal carrier for drug delivery and release due to its excellent biocompatibility, stability under physiological conditions and responsiveness to the weak acidic environment associated with malignant tumors and other diseases. In fact, the small molecular drugs(doxorubicin, 5-fluorouracil) and biological macromolecules(antibody, nuclein) have all been loaded into ZIF-8 for chemotherapy, photothermal therapy, photodynamic therapy and biosensing. The particle size of ZIF-8 is very important for biomedical applications, and accurate functional regulation of ZIF-8 is agreat challenge for its biomedical application. Herein, we review the synthesis methods, size-control and biomedicalapplications of ZIF-8.

¡¡¡¡Keyword£º¡¡ZIF-8; synthetic mechanism; size control; acidic environmental responsivity; biomedical application;

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¡¡¡¡Fig.1 Surfactant-free synthesis by simply mixing precursors in appropriate solvents either at room temperature or at elevatedtemperature[41]. Copyright 2015, American Chemical Society

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¡¡¡¡Fig.2 Schematic illustration of the importance of nanosized PCP crystals with the enhanced contribution of crystal interfaces[5]. Copyright 2010, American Chemical Society

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¡¡¡¡Í¼3 À©É¢ÀíÂÛÏÂZIF-8µÄ½á¾§Ä£ÐÍ[19]

¡¡¡¡Fig.3 Theoretical basis of the reaction-diffusion framework(RDF).

¡¡¡¡(A)Diffusion profiles of Hm Im(outer)and Zn2+/Co2+(inner)are depicted at a given time.Evolution of the reaction zone is also shown and exhibits a decrease of its amplitude and broadening of its width.Xfdenotes thelocation of the peak which also corresponds to the location of the precipitation front.(B)Nucleation of pure ZIF-8 leading to nanosperoids takesplace within the reaction zone[19].Copyright 2018,American Chemical Society

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¡¡¡¡¡¡¡¡Fig.7 Schematic illustration of Fe3O4@PAA/AuNCs/ZIF-8 composite NPs for simultaneous tri-modal cancer imagingand chemotherapy[55]. Copyright 2015, The Royal Society of Chemistry

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¡¡¡¡Fig.8 Characterization of biomimetically mineralized biocomposite.

¡¡¡¡(a)SEM image showing the crystals obtained using BSA as a growth agentfor biomimetic mineralization(scale bar,1μm).(b)Photograph and(c)confocal laser scanning microscopy image of the biomomimetically mineralized ZIF-8 composite obtained using BSA labelled with FITC.This biocomposite(ZIF-8/FITC-BSA)was prepared at 37¡æ£¬washed and exposed to ultraviolet light of wavelength 365 and 495 nm,respectively(scale bar,10μm).(d)PXRD of the MOF-BSA biocomposite.(e)FTIRspectra of BSA(red),ZIF-8/BSA(orange),standard ZIF-8post incubated with BSA after washing(blue),and standard ZIF-8(black).(f)SAXS data of the ZIF-8/BSAbiocompositeand a schematic showing the relative size of BSA to the mesopore.(g)Schematic proposing the biomimetically mineralized growthof ZIF-8.Each BSAmolecule attracts 31 2-methylimidazole(Hm Im)ligands and22 Zn2+ions,facilitating the nucleation of ZIF-8 crystals[60].Copyright 2015,Springer Nature

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