Directory of Open Access Journals (DOAJ)
Hiroyuki Inouye, Shinichi Ueda, Yoshio Takeda,
... GPS) has been encapsulated into zeolitic imidazolate frameworks (ZIF-8) in aqueous solution at room temperature. ZIF-8 MOFs were observed to be suitable and ... of GPS. The single step synthesis of GPS@ZIF-8 reflected high loading efficacy of GPS into ZIF-8 of about 84%, while, its loading capacity was revealed to be 10.77%. GPS@ZIF-8 and ZIF-8 were characterized through different techniques. Morphology of GPS@ZIF-8, assessed through SEM and TEM, revealed to ... hexagonal shape which is much alike to pure ZIF-8. Moreover, average particle size of ZIF-8 ...
Tópico(s): Phytochemical Studies and Bioactivities
1968 - Elsevier BV | Tetrahedron Letters
Jung Hwa Park, S PARK, Sung Hwa Jhung,
... 제올라이 트와 유사한 구조를 갖는 zeolitic imidazolate framework (ZIF)를 처음으로 마이크로파(MW)를 이용하여 합성하였다. ZIF 중 잘 알려진 ZIF-8을 전통적인 전기 가열(CE)과 마이크로파 조사로 합성하였으며 ZIF-8은 $140{\sim}180^{\circ}C}$ 의 범위에서 용이하게 얻을 수 있었다. MW 합성에 의해 ZIF-8을 신속 하게 합성할 수 있었으며 결정 크기는 ... 합성 반응이 종료됨을 알 수 있었다. MW로 얻어진 ZIF-8은 CE에 의한 ZIF-8에 비해 증가된 표면적과 세공부피를 가 졌다. 얻어진 모든 ZIF-8은 질소 흡착 실험 결과 type-I 흡착 ... 있었다. FTIR 및 TGA 결과 두 방법으로 얻어진 ZIF-8은 서로 유사한 결합 및 열적 특성을 보였다. ...
Tópico(s): Multicomponent Synthesis of Heterocycles
2009 - Korean Chemical Society | Journal of the Korean Chemical Society
Anh Phan, Christian J. Doonan, Fernando J. Uribe‐Romo, Carolyn B. Knobler, M. O’Keeffe, Omar M. Yaghi,
... be possible to make new zeolitic imidazolate frameworks (ZIFs) with topologies based on those of tetrahedral zeolites. ... within the last 5 years over 90 new ZIF structures have been reported. The recent application of high-throughput synthesis and characterization of ZIFs has expanded this structure space significantly: it is now possible to make ZIFs with topologies previously unknown in zeolites, in addition ... Account, we describe the general preparation of crystalline ZIFs, discussing the methods that have been developed to ...
Tópico(s): Zeolite Catalysis and Synthesis
2009 - American Chemical Society | Accounts of Chemical Research
Philip C.N. Chiu, Pak Chung Ho, Ernest Hung Yu Ng, William S.B. Yeung,
... gonadotrophin stimulated cycles contained two glycoproteins, named as ZIF‐1 and ZIF‐2, that reduced the zona binding capacity of ... the hemizona binding assay, the inhibitory effect of ZIF‐1 on the zona binding capacity of spermatozoa was dose‐dependent. The effect of ZIF‐2 was also dose‐dependent, in the range ... 100 ng/ml. The inhibitory effects of both ZIF‐1 and ‐2 increased with the duration of the spermatozoa–ZIF interaction. The effect of the former was present ... 90 min. The zona binding inhibitory effect of ZIF‐1 and ‐2 was additive when they were ...
Tópico(s): Reproductive biology and impacts on aquatic species
2002 - Wiley | Molecular Reproduction and Development
Philip C.N. Chiu, Riitta Koistinen, Hannu Koistinen, Markku Seppälä, Ckf Lee, William S.B. Yeung,
... studies showed that zona binding inhibitory factor-1 (ZIF-1) was the glycoprotein mainly responsible for the ... zona binding inhibitory activity of human follicular fluid. ZIF-1 has a number of properties similar to ... demonstrated the presence of two binding sites of ZIF-1 on human spermatozoa. These binding sites were saturable, reversible, and bound to 125 I-ZIF-1 in a time-, concentration-, and temperature-dependent ... Glycodelin-A shared one common binding site with ZIF-1 on spermatozoa, and it could displace only ...
Tópico(s): Reproductive System and Pregnancy
2003 - Elsevier BV | Journal of Biological Chemistry
... separation performance of two typical zeolitic imidazolate frameworks (ZIFs), ZIF-68 and ZIF-69, for CO2/N2, CO2/CH4, and CH4/ ... for describing CO2, N2, and CH4 adsorption in ZIFs. On the basis of the validated force field, adsorption selectivities of the three mixtures in these ZIFs were simulated then. The results show that ZIF-69 is more beneficial for separating CO2 from CO2-related mixtures than ZIF-68, mainly due to the presence of chlorine ... considered. The overall separation performances of these two ZIFs for separating the chosen mixtures are comparable to ...
Tópico(s): Membrane Separation and Gas Transport
2010 - American Chemical Society | The Journal of Physical Chemistry C
Sang Soo Han, Seung‐Hoon Choi, William A. Goddard,
... H2 uptake behavior of 10 zeolitic−imidazolate frameworks (ZIFs), based on grand canonical Monte Carlo (GCMC) simulations. ... fields (FFs) describing the interactions between H2 and ZIF in the GCMC were based on ab initio ... no empirical data. For each of these 10 ZIFs we report the total and excess H2 adsorption ... We report the hydrogen adsorption sites in the ZIFs and the relationships between H2 uptake amount, isosteric ... and free volume. Our simulation shows that various ZIFs lead to a variety of H2 adsorption behaviors ...
Tópico(s): Carbon dioxide utilization in catalysis
2010 - American Chemical Society | The Journal of Physical Chemistry C
Ma. Josephine C. Ordoñez, Kenneth J. Balkus, John P. Ferraris, Inga H. Musselman,
Zeolitic imidazolate frameworks (ZIFs), that have the potential for gas separation, were used as additives in mixed-matrix membranes (MMMs). ZIF-8, which exhibits the sodalite topology, is composed ... II) ion clusters linked by imidazolate ligands. The ZIF-8 pore aperture is 3.4 Å allowing ... absorb small molecules such as H2 and CO2. ZIF-8/Matrimid® MMMs were fabricated with loadings up ... materials. Only at the highest loading did the ZIF-8/Matrimid® MMM show a loss of mechanical strength, leading to a decrease in flexibility. The ZIF-8/Matrimid® MMMs permeability properties were tested for ...
Tópico(s): Covalent Organic Framework Applications
2010 - Elsevier BV | Journal of Membrane Science
Sang Soo Han, Seung Ho Choi, William A. Goddard,
... Li+, Na+, and K+)-doped zeolitic imidazolate frameworks (ZIFs) lead to significant improvement of H2 uptake at ... example, at 298 K and 100 bar, Li-ZIF-70 totally binds to 3.08 wt % H2, Na-ZIF-70 to 2.19 wt % H2, and K-ZIF-70 to 1.62 wt % H2, much higher than 0.74 wt % H2 for pristine ZIF-70. Thus, the dopant effect follows the order of Li-ZIF > Na-ZIF > K-ZIF, which correlates with the H2 binding energies to ... show that delivery H2 uptake leads to Na-ZIF-70 (1.37 wt %) > K-ZIF-70 (1.25 wt %) > Li-ZIF-70 (1. ...
Tópico(s): Covalent Organic Framework Applications
2011 - American Chemical Society | The Journal of Physical Chemistry C
Zhijuan Zhang, Shikai Xian, Hongxia Xi, Haihui Wang, Zhong Li,
The imidazolate framework ZIF-8 samples were modified separately by using ammonia impregnation and thermal treatment in atmosphere of N2 or H2 in ... property toward CO2, and the modified samples A-ZIF-8, N-ZIF-8 and H-ZIF-8 were correspondingly available. The modified ZIF-8 samples were characterized, and the surface chemical properties of the ZIF-8 samples were determined separately by FTIR, CO2- ... TPD. The isotherms of CO2 on the modified ZIF-8 samples were measured. Results showed that after ... samples significantly increased, and followed the order: A-ZIF-8>H-ZIF-8>N-ZIF-8>O- ...
Tópico(s): Carbon Dioxide Capture Technologies
2011 - Elsevier BV | Chemical Engineering Science
Eryu Chen, Yingchun Liu, Min Zhou, Li Zhang, Qi Wang,
... adsorption of hydrogen gas in zeolitic imidazolate frameworks (ZIF-1, ZIF-2, ZIF-3, ZIF-4, ZIF-6, ZIF-10 and ZIF-64). In this set of ZIFs, all of them have the same metal atoms ... A reasonable relationship between the saturated adsorption of ZIFs and their effective porosities is established. Further, this ... used to predict the saturated adsorption amounts of ZIFs with the same metal atoms and ligands. In ...
Tópico(s): Membrane Separation and Gas Transport
2011 - Elsevier BV | Chemical Engineering Science
Chen Zhang, Ying Dai, J.R. Johnson, Oğuz Karvan, William J. Koros,
... 6FDA-DAM polyimide and a zeolitic imidazolate framework (ZIF-8). Equilibrium isotherms and sorption kinetics of C3H6 ... were studied on a 200 nm commercially available ZIF-8 sample produced by BASF. Mixed matrix dense ... formed with 6FDA-DAM and 200 nm BASF ZIF-8 particles. SEM imaging showed generally good adhesion between the ZIF-8 and 6FDA-DAM without the need for surface-treating ZIF-8. Pure gas permeation showed significantly enhanced mixed matrix ZIF-8/6FDA-DAM membrane C3H6/C3H8 separation performance ...
Tópico(s): Membrane Separation Technologies
2011 - Elsevier BV | Journal of Membrane Science
Daigo Yamamoto, Taisuke Maki, Satoshi Watanabe, Hideki Tanaka, Minoru T. Miyahara, Kazuhiro Mae,
We synthesized size-controlled zeolitic imidazolate framework (ZIF-8) nanoparticles using a T-type micromixer. The nanocrystallization of ZIF-8 proceeds by a rapid coordination reaction of Zn2+ ions and 2- ... required to control the size and morphology of ZIF-8 nanoparticles. First, we prepared ZIF-8 nanoparticles at various flow rates of raw ... a T-type micromixer. The size of the ZIF-8 nanoparticles decreased with an increase in flow ... and [2-MeIM]/[Zn2+] ratios on the resultant ZIF-8 nanoparticles to elucidate the formation mechanism and ...
Tópico(s): Membrane Separation Technologies
2012 - Elsevier BV | Chemical Engineering Journal
Gui Min Shi, Tingxu Yang, Tai‐Shung Chung,
We have synthesized nano-sized zeolitic imidazolate frameworks (ZIF-8) and prepared polybenzimidazole (PBI)/ZIF-8 mixed matrix membranes (MMMs) with uniform morphology comprising ZIF as high as 58 wt% by directly mixing the as-synthesized ZIF-8 suspension into the polymer dope for pervaporation ... data show that the water permeability of PBI/ZIF-8 (1:1) MMMs is about one order ... for PBI membranes consisting of 33.7 wt% ZIF-8 nano-particles. As a result, the 33.7 wt% ZIF-8 in PBI membrane increases water permeability four ...
Tópico(s): Membrane-based Ion Separation Techniques
2012 - Elsevier BV | Journal of Membrane Science
... as-synthesized wet-state zeolitic imidazolate frameworks-8 (ZIF-8) nano-particles into a polybenzimidazole (PBI) polymer. The loadings of ZIF-8 particles in the two membranes (i.e., 30/70 (w/w) ZIF-8/PBI and 60/40 (w/w) ZIF-8/PBI) are 38.2 vol % and 63.6 vol %, respectively. Due to different ZIF-8 loadings, variations in particle dispersion, membrane morphology ... permeation results suggest that intercalation occurs when the ZIF-8 loading reaches 63.6 vol %. The incorporation of ZIF-8 particles significantly enhances both solubility and diffusion ...
Tópico(s): Metal-Organic Frameworks: Synthesis and Applications
2012 - Elsevier BV | International Journal of Hydrogen Energy
David Dubbeldam, Rajamani Krishna, Sofı́a Calero, Ahmet Özgür Yazaydın,
... Zahl an Adsorbentien, darunter Zeolithe, MOFs, COFs und ZIFs (siehe Schema), mithilfe moderner Computertechniken wurde ZIF-77 als bestes Adsorbens identifiziert. Mit ihm lassen ... mov2.5 MB uio-66 ange_201205040_sm_zif-77_13_component_pulse.mov2.9 MB zif-77_13_component_pulse ange_201205040_sm_zif-77_15_component_pulse.mov3 MB zif-77_15_component_pulse ange_201205040_sm_zif-77_pulse.mov1.7 MB zif-77_pulse ange_201205040_sm_zif-77.mov1.9 MB zif-77 ange_201205040_sm_zif-8_pulse.mov575. ...
Tópico(s): Covalent Organic Framework Applications
2012 - Wiley | Angewandte Chemie
Beatriz Seoane, Juan M. Zamaro, Carlos Téllez, Joaquı́n Coronas,
Zeolitic imidazolate frameworks ZIF-7, ZIF-8, ZIF-11 and ZIF-20 have been synthesized by sonocrystallization. In general, crystals obtained at lower temperatures and shorter times are smaller and have ... of time. According to the parameters calculated, for ZIF-8 the nucleation rate controls the synthesis reaction, while for ZIF-11 and ZIF-20 both growth and nucleation ...
Tópico(s): Calcium Carbonate Crystallization and Inhibition
2012 - Royal Society of Chemistry | CrystEngComm
... H2/N2, H2/CH4) in zeolite imidazolate framework (ZIF) membranes and ZIF/polymer composite membranes. The predictions of atomic models ... comparing with the available experimental data for a ZIF-90 membrane. Motivated from the good agreement between ... we extended atomic modeling methods to an unfabricated ZIF membrane, ZIF-65, for predicting its separation performance. Various selectivities of ZIF membranes such as ideal selectivity, mixture selectivity, adsorption ... of operating conditions to assess the potential of ZIF membranes in H2/CO2 separations. We then combined ...
Tópico(s): Membrane Separation and Gas Transport
2012 - American Chemical Society | Industrial & Engineering Chemistry Research
James Hughes, Thomas D. Bennett, Anthony K. Cheetham, Alexandra Navrotsky,
... calorimetry of a series of zeolite imidazolate frameworks (ZIFs) has been completed. The enthalpies of formation of the evacuated ZIFs-ZIF-zni, ZIF-1, ZIF-4, CoZIF-4, ZIF-7, and ZIF-8-along with as-synthesized ZIF-4 (ZIF-4·DMF) and ball-milling amorphized ZIF-4 (a(m)ZIF-4) were measured with ...
Tópico(s): Zeolite Catalysis and Synthesis
2012 - American Chemical Society | Journal of the American Chemical Society
Liang Mu, Bei Liu, Huang Liu, Yuntao Yang, Chang‐Yu Sun, Guangjin Chen,
... and forming hydrates in it, was proposed. Commercialized ZIF-8 was adopted as it is very stable ... and hydrate formation behaviors of methane in wet ZIF-8 with five different water contents (0.0%, ... formation conditions and the storage capacities of both ZIF-8 frameworks and ZIF-8 particle beds were determined. Our results show that hydrates can form in wet ZIF-8 pores and thus increase the overall storage capacities of both ZIF-8 frameworks and ZIF-8 particle beds remarkably. The contribution of hydrates ...
Tópico(s): Enhanced Oil Recovery Techniques
2012 - Royal Society of Chemistry | Journal of Materials Chemistry
Zhijuan Zhang, Shikai Xian, Qibin Xia, Haihui Wang, Zhong Li, Jing Li,
Imidazolate framework ZIF‐8 is modified via postsynthetic method using etheylenediamine to improve its adsorption performance toward CO 2 . Results show that the BET surface area of the modified ZIF‐8 (ED‐ZIF‐8) increases by 39%, and its adsorption capacity ... area is almost two times of that on ZIF‐8 at 298 K and 25 bar. H 2 O uptake on the ED‐ZIF‐8 become obviously lower compared to the ZIF‐8. The ED‐ZIF‐8 selectivity for CO 2 /N 2 adsorption ... bar, being almost twice of those of the ZIF‐8. The isosteric heat of CO 2 adsorption ( ...
Tópico(s): Membrane Separation and Gas Transport
2012 - Wiley | AIChE Journal
Marieke Oldenbroek, Scott Robertson, Tugba Guven-Ozkan, Steven Gore, Yuichi Nishi, Rueyling Lin,
... controlled by translation of the substrate-binding subunit, ZIF-1, of an E3 ligase. We now show that ZIF-1 expression in embryos is regulated by five ... 3, and SPN-4 function as repressors of ZIF-1 expression, whereas MEX-5 and MEX-6 ... repression. All five proteins bind directly to the zif-1 3′ UTR in vitro. We show that, ... and MEX-5/6 have antagonistic roles in ZIF-1 expression. In vitro, they bind to a common region of the zif-1 3′ UTR, with MEX-5 binding impeding that by POS-1. The region of the zif-1 3′ UTR bound by MEX-5/6 ...
Tópico(s): CRISPR and Genetic Engineering
2012 - Elsevier BV | Developmental Biology
Liling Zhang, Zhongqiao Hu, Jianwen Jiang,
... composed of polybenzimidazole (PBI) and zeolitic imidazolateframework-7 (ZIF-7). PBI is mimicked by the polymer-consistent force field and ZIF-7 by a new force field developed here. ... simulated lattice constants, bond lengths and angles of ZIF-7 match well with measured data. PBI/ZIF-7 membranes have stronger mechanical strength than PBI ... evidenced by the enhanced bulk modulus upon adding ZIF-7. With increased ZIF-7 loading, the fractional free volume and percentage ... and CO2 increase because of stronger affinity with ZIF-7. H2 diffusion in PBI membrane is not ...
Tópico(s): Covalent Organic Framework Applications
2012 - American Chemical Society | The Journal of Physical Chemistry C
William Morris, Ning He, Keith G. Ray, Peter Klonowski, Hiroyasu Furukawa, Isaak N. Daniels, Yao Houndonougbo, Mark Asta, Omar M. Yaghi, Brian B. Laird,
... CO2 adsorption data for four zeolitic imidazolate frameworks (ZIFs) to 55 bar, namely ZIF-7, ZIF-11, ZIF-93, and ZIF-94. Modification of synthetic conditions allows access to ... with the same metal ion and organic link: ZIF-7 (ZIF-94) having sod topology and ZIF-11 (ZIF-93) having the rho topology. The varying topology, ... the effect of topology on gas adsorption in ZIFs. The experiments show that the topologies with the ...
Tópico(s): Covalent Organic Framework Applications
2012 - American Chemical Society | The Journal of Physical Chemistry C
Produção Nacional
Revisado por pares
Iane B. Vasconcelos, Teresinha G. da Silva, Gardênia Carmen Gadelha Militão, Thereza A. Soares, Nailton M. Rodrigues, Marcelo O. Rodrigues, Nivan B. da Costa, Ricardo O. Freire, Severino Alves,
... cancer drug doxorubicin into the zeolitic imidazolate framework (ZIF-8) with high-load and progressive release. Adsorption measurements show that doxorubicin is incorporated into ZIF-8 with a load of 0.049 g doxorubicin g−1 dehydrated ZIF-8. Doxorubicin is released in a highly controlled ... the antitumoral potential and cytotoxicity of the doxorubicin-ZIF-8 (DOXO-ZIF-8) complex towards the mucoepidermoid carcinoma of human ... lines. It is shown that the complex doxorubicin-ZIF-8 exhibits lower cytotoxicity than pure doxorubicin for ...
Tópico(s): Advanced NMR Techniques and Applications
2012 - Royal Society of Chemistry | RSC Advances
Miral Shah, Hyuk Taek Kwon, Vu Tran, Sonny Sachdeva, Hae‐Kwon Jeong,
Zeolitic imidazolate frameworks (ZIFs), a sub-class of metal–organic frameworks (MOFs), are noted for their remarkable thermal and chemical stability, tunable microporous ... we report one step in situ synthesis of ZIF-8 membranes on unmodified porous α-alumina supports ... critical role for formation of well-intergrown continuous ZIF-8 membranes. Sodium formate was found to enhance the heterogeneous nucleation of ZIF-8 crystals on alumina supports as well as to promote intergrowth of ZIF-8 crystals. It was confirmed that sodium formate ...
Tópico(s): Membrane Separation and Gas Transport
2012 - Elsevier BV | Microporous and Mesoporous Materials
Mikaela Gustafsson, Xiaodong Zou,
... formation and crystal size of zeolitic imidazolate frameworks (ZIFs) using mixed linkers, imidazole (Im) and benzimidazole (bIm), ... powder diffraction (XRPD) and scanning electron microscopy (SEM). ZIF-7 and ZIF-62 were identified as the main phases and ... The range of batch composition giving rise to ZIF-7 and ZIF-62 was identified from the phase diagram. Changes of crystal size and morphology of ZIF-7 and ZIF-62 in terms of batch composition and synthesis ... and different trends were observed for the two ZIFs. Thermogravimetric analysis (TGA) and in situ XRPD showed ...
Tópico(s): Magnetism in coordination complexes
2012 - Springer Science+Business Media | Journal of Porous Materials
Naoka Murakami, Takehiko Yokomizo, Toshiaki Okuno, Takao Shimizu,
... expression of G2A caused significant activation of the zif 268 promoter and inositol phosphate (IP) accumulation at ... expression of G2A caused significant activation of the zif 268 promoter and inositol phosphate (IP) accumulation at ... G2A activation determined by reporter gene assay using zif 268 promoter and measuring IP accumulation, both of ... G2A or an empty vector, 480 ng of zif 268-firefly luciferase-pGL2 (a kind gift from ... 01, as indicated. pH-dependent Activation of the zif 268 Promoter through G2A—As G2A was reported ...
Tópico(s): Ion Transport and Channel Regulation
2004 - Elsevier BV | Journal of Biological Chemistry