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  1. Article ; Online: Sensitivity of the glass transition and melting in a metal-organic framework to ligand chemistry.

    Madsen, Rasmus S K / Sarkar, Sounak / Iversen, Bo Brummerstedt / Yue, Yuanzheng

    Chemical communications (Cambridge, England)

    2022  Volume 58, Issue 6, Page(s) 823–826

    Abstract: The effect of substituting linkers with electron-donating moieties for part of the conventional ones on the melting and glass transition behaviours of ZIF-62 was investigated by calorimetry and X-ray diffraction. Specifically, substituting 5,6- ... ...

    Abstract The effect of substituting linkers with electron-donating moieties for part of the conventional ones on the melting and glass transition behaviours of ZIF-62 was investigated by calorimetry and X-ray diffraction. Specifically, substituting 5,6-dimethylbenzimidazole for benzimidazole in ZIF-62 increases both
    Language English
    Publishing date 2022-01-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/d1cc03541j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Sensitivity of the glass transition and melting in a metal–organic framework to ligand chemistry

    Madsen, Rasmus S. K. / Sarkar, Sounak / Iversen, Bo Brummerstedt / Yue, Yuanzheng

    Chemical communications. 2022 Jan. 18, v. 58, no. 6

    2022  

    Abstract: The effect of substituting linkers with electron-donating moieties for part of the conventional ones on the melting and glass transition behaviours of ZIF-62 was investigated by calorimetry and X-ray diffraction. Specifically, substituting 5,6- ... ...

    Abstract The effect of substituting linkers with electron-donating moieties for part of the conventional ones on the melting and glass transition behaviours of ZIF-62 was investigated by calorimetry and X-ray diffraction. Specifically, substituting 5,6-dimethylbenzimidazole for benzimidazole in ZIF-62 increases both Tₘ and Tg. The structural origin of this effect was explained.
    Keywords X-ray diffraction ; benzimidazole ; calorimetry ; coordination polymers ; glass transition ; ligands
    Language English
    Dates of publication 2022-0118
    Size p. 823-826.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/d1cc03541j
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Mixed metal node effect in zeolitic imidazolate frameworks

    Madsen, Rasmus S. K. / Stepniewska, Malwina / Yang, Yongjian / Qiao, Ang / Winters, Wessel M. W. / Zhou, Chao / König, Jakob / Mauro, John C. / Yue, Yuanzheng

    RSC advances. 2022 Apr. 07, v. 12, no. 17

    2022  

    Abstract: We synthesized two series of bimetallic (zinc and cobalt) zeolitic imidazolate frameworks (ZIF-62) under different solvothermal conditions. It is found that the structure of the derived ZIF crystals is highly sensitive to synthesis conditions. One series ...

    Abstract We synthesized two series of bimetallic (zinc and cobalt) zeolitic imidazolate frameworks (ZIF-62) under different solvothermal conditions. It is found that the structure of the derived ZIF crystals is highly sensitive to synthesis conditions. One series possesses the standard ZIF-62 structure, whereas the other has a mixed structure composed of both the standard structure and an unknown one. The standard series exhibits a slight negative deviation from linearity of melting temperature (Tₘ) and glass transition temperature (Tg) with the substitution of Co for Zn. In contrast, the new series displays a stronger negative deviation. These negative deviations from linearity indicate the mixed metal node effect in bimetallic ZIF-62 due to the structural mismatch between Co²⁺ and Zn²⁺ and to the difference in their electronic configurations. The new series involves both cobalt-rich and zinc-rich phases, whereas the standard one shows one homogeneous phase. Density functional theory calculations predict that the substitution of Co for Zn increases the bulk modulus of the ZIF crystals. This work indicates that the structure, melting behaviour, and mechanical properties of ZIFs can be tuned by metal node substitution and by varying the synthetic conditions. Both series of ZIFs have higher glass forming abilities due to their higher Tg/Tₘ ratios (0.77–0.84) compared to most good glass formers.
    Keywords cobalt ; density functional theory ; glass ; glass transition temperature ; zinc
    Language English
    Dates of publication 2022-0407
    Size p. 10815-10824.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/d2ra00744d
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Mixed metal node effect in zeolitic imidazolate frameworks.

    Madsen, Rasmus S K / Stepniewska, Malwina / Yang, Yongjian / Qiao, Ang / Winters, Wessel M W / Zhou, Chao / König, Jakob / Mauro, John C / Yue, Yuanzheng

    RSC advances

    2022  Volume 12, Issue 17, Page(s) 10815–10824

    Abstract: We synthesized two series of bimetallic (zinc and cobalt) zeolitic imidazolate frameworks (ZIF-62) under different solvothermal conditions. It is found that the structure of the derived ZIF crystals is highly sensitive to synthesis conditions. One series ...

    Abstract We synthesized two series of bimetallic (zinc and cobalt) zeolitic imidazolate frameworks (ZIF-62) under different solvothermal conditions. It is found that the structure of the derived ZIF crystals is highly sensitive to synthesis conditions. One series possesses the standard ZIF-62 structure, whereas the other has a mixed structure composed of both the standard structure and an unknown one. The standard series exhibits a slight negative deviation from linearity of melting temperature (
    Language English
    Publishing date 2022-04-07
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d2ra00744d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Ultrahigh-field

    Madsen, Rasmus S K / Qiao, Ang / Sen, Jishnu / Hung, Ivan / Chen, Kuizhi / Gan, Zhehong / Sen, Sabyasachi / Yue, Yuanzheng

    Science (New York, N.Y.)

    2020  Volume 367, Issue 6485, Page(s) 1473–1476

    Abstract: The structure of melt-quenched zeolitic imidazole framework (ZIF) glasses can provide insights into their glass-formation mechanism. We directly detected short-range disorder in ZIF glasses using ultrahigh-field zinc-67 solid-state nuclear magnetic ... ...

    Abstract The structure of melt-quenched zeolitic imidazole framework (ZIF) glasses can provide insights into their glass-formation mechanism. We directly detected short-range disorder in ZIF glasses using ultrahigh-field zinc-67 solid-state nuclear magnetic resonance spectroscopy. Two distinct Zn sites characteristic of the parent crystals transformed upon melting into a single tetrahedral site with a broad distribution of structural parameters. Moreover, the ligand chemistry in ZIFs appeared to have no controlling effect on the short-range disorder, although the former affected their phase-transition behavior. These findings reveal structure-property relations and could help design metal-organic framework glasses.
    Language English
    Publishing date 2020-03-24
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.aaz0251
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 27: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (1.OG)
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    Zs.MG 77: Show issues

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  6. Article ; Online: Fabrication of Super-Sized Metal Inorganic-Organic Hybrid Glass with Supramolecular Network via Crystallization-Suppressing Approach.

    Ali, Mohamed A / Winters, Wessel M W / Mohamed, Moushira A / Tan, Dezhi / Zheng, Guojun / Madsen, Rasmus S K / Magdysyuk, Oxana V / Diaz-Lopez, Maria / Cai, Biao / Gong, Nan / Xu, Yijue / Hung, Ivan / Gan, Zhehong / Sen, Sabyasachi / Sun, Hong-Tao / Bennett, Thomas D / Liu, Xiaofeng / Yue, Yuanzheng / Qiu, Jianrong

    Angewandte Chemie (International ed. in English)

    2023  Volume 62, Issue 14, Page(s) e202218094

    Abstract: Metal coordination compound (MCC) glasses [e.g., metal-organic framework (MOF) glass, coordination polymer glass, and metal inorganic-organic complex (MIOC) glass] are emerging members of the hybrid glass family. So far, a limited number of crystalline ... ...

    Abstract Metal coordination compound (MCC) glasses [e.g., metal-organic framework (MOF) glass, coordination polymer glass, and metal inorganic-organic complex (MIOC) glass] are emerging members of the hybrid glass family. So far, a limited number of crystalline MCCs can be converted into glasses by melt-quenching. Here, we report a universal wet-chemistry method, by which the super-sized supramolecular MIOC glasses can be synthesized from non-meltable MOFs. Alcohol and acid were used as agents to inhibit crystallization. The MIOC glasses demonstrate unique features including high transparency, shaping capability, and anisotropic network. Directional photoluminescence with a large polarization ratio (≈47 %) was observed from samples doped with organic dyes. This crystallization-suppressing approach enables fabrication of super-sized MCC glasses, which cannot be achieved by conventional vitrification methods, and thus allows for exploring new MCC glasses possessing photonic functionalities.
    Language English
    Publishing date 2023-02-21
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202218094
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Fine control of NaCl crystal size and particle size in percrystallisation by tuning the morphology of carbonised sucrose membranes

    Madsen, Rasmus S.K / Anne Julbe / James Vaughan / João C. Diniz da Costa / Julius Motuzas

    Journal of membrane science. 2018 Dec. 01, v. 567

    2018  

    Abstract: This work investigates the morphological features of porous carbon membranes and operation effects for the percrystallisation of NaCl. The carbon membranes were prepared by dip coating of α-alumina tubes in a sucrose solution, followed by a post vacuum- ... ...

    Abstract This work investigates the morphological features of porous carbon membranes and operation effects for the percrystallisation of NaCl. The carbon membranes were prepared by dip coating of α-alumina tubes in a sucrose solution, followed by a post vacuum-assisted impregnation and carbonisation in an inert gas atmosphere. The carbonisation temperature played an important role, as the highest pore volume and wet contact angle were achieved at the highest carbonisation temperature of 750 °C. In turn, this created hydrophobic carbon membranes delivering the highest water flux of 33 L m−2 h−1 (NaCl 17.5 wt%) and NaCl flux of 6.9 kg m−2 h−1. The solvent (water) and the solute (NaCl) crystals were separated in a single-step in a wet thin-film formed on the permeate face of the membrane under pervaporation conditions, delivering almost pure water (> 99%) and dry NaCl crystals. The carbon membrane with the highest water flux delivered the smallest NaCl crystallite sizes, the smaller particle sizes, and the narrowest particle size distribution (< 2 μm). This was attributed to the fast water evaporation rate from the wet thin-film, as crystal growth rate was reduced and NaCl particle aggregation was restricted. A finer control of NaCl crystallite and particle size was achieved by tailoring the morphological features of the carbon membranes and operating at the lowest vacuum pressure.
    Keywords aluminum oxide ; artificial membranes ; carbon ; carbonization ; coatings ; contact angle ; crystallites ; evaporation rate ; hydrophobicity ; particle size ; particle size distribution ; pervaporation ; sodium chloride ; solutes ; solvents ; sucrose ; temperature
    Language English
    Dates of publication 2018-1201
    Size p. 157-165.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 194516-6
    ISSN 0376-7388
    ISSN 0376-7388
    DOI 10.1016/j.memsci.2018.09.003
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 78/706: Show issues

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