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Wyświetlanie 1-4 z 4
Tytuł:
Kompozyty z materiałów węglowych i metalo-organicznych (MOF)
Composites of carbonaceous materials and metal-organic frameworks
Autorzy:
Bieniek, A.
Wiśniewski, M.
Terzyk, A. P.
Bolibok, P.
Dembek, M.
Powiązania:
https://bibliotekanauki.pl/articles/297692.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
composites
carbonaceous materials
MOF
metal-organic frameworks
kompozyty
materiały węglowe
struktury metaloorganiczne
Opis:
The paper presents a brief review of the literature in the field of composites made of carbon materials and MOF structures. It focuses on presenting numerous examples of composites and the positive effects of the merger of these groups of materials. The new class of composites combines carbon materials with the functionality of inorganic materials. These composites offer a chance to eliminate weaknesses and enhance the capacity of each group. These composites proved that integrating MOF materials with carbonaceous materials can not only convert a significant weakness of MOF, but also surprisingly bring many new features such as improved resistance, i.e. for moisture, and electrical conductivity. These composites broaden the horizons of applications in the fields of adsorption, separation, catalysis, electrochemistry and sensors. In the future, using a variety of MOF structures and carbonaceous materials, newly formed composites will probably push the boundaries of cognition in many fields.
Praca przedstawia krótki przegląd literaturowy z zakresu kompozytów złożonych z materiałów węglowych oraz materiałów metalo-organicznych (ang. metal-organic frameworks, MOF). Skupia się na zaprezentowaniu licznych przykładów tworzenia kompozytów z powyższych grup materiałów oraz ukazaniu pozytywnych efektów takiego postępowania. Nowa klasa kompozytów łączy cechy materiałów węglowych z funkcjonalnością materiałów nieorganicznych. Kompozyty te dają szansę na wyeliminowanie wad i lepsze wykorzystanie potencjału każdej z grup. Poprzez integrację materiałów MOF z materiałami węglowymi można nie tylko znacząco zminimalizować wady MOF, ale, co więcej, uzyskać wiele nowych funkcji, takich jak poprawa odporności, np. na wilgoć, czy przewodności elektrycznej. Dzięki tym kompozytom poszerzają się horyzonty aplikacyjne w dziedzinach adsorpcji, separacji, katalizy, a także elektrochemii i sensorów. W przyszłości korzystając z różnorodności struktur MOF i materiałów węglowych, nowo powstałe kompozyty, podobnie jak MOF i materiały węglowe, być może pozwolą przesunąć granice poznawcze w wielu dziedzinach.
Źródło:
Inżynieria i Ochrona Środowiska; 2016, 19, 3; 319-329
1505-3695
2391-7253
Pojawia się w:
Inżynieria i Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znaczenie mikroporowatych materiałów metaloorganicznych (MOF ) dla potrzeb magazynowania wodoru
Microporous metal-organic frameworks for hydrogen storage
Autorzy:
Czub, J.
Gondek, Ł
Figiel, H.
Powiązania:
https://bibliotekanauki.pl/articles/172476.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
materiały metalo-organiczne
materiały mikroporowate
MOF
adsorpcja
magazynowanie wodoru
metal-organic frameworks
microporous materials
adsorption
hydrogen storage
Opis:
Currently, the metal-organic frameworks (MOF s) are considered among the most promising materials for hydrogen storage. In this paper, the properties of MOF s that are particularly important for application purposes are presented. Examples include simplicity of their syntheses on an industrial scale, low synthesis costs, high thermal stability and durability, an excellent repeatability and very low degree of degradation during cyclic hydrogen loading and recovery. On the other hand, the potential use of MOF s as hydrogen reservoirs is to some extent limited due to the fact that the low temperatures of 77 K are required for effective adsorption of hydrogen in the microporous structures of MOF s. Nowadays, the research on MOF s is carried in two directions. In particular, there are intensive studies on increasing of the concentration of hydrogen adsorbed at low temperatures in order to determine the limiting value for which maintaining the reservoir at the temperature of liquid hydrogen would be economically viable. It seems that the limiting concentration is being currently reached. The second direction of research is to increase the limiting value of temperature at which the concentration of adsorbed hydrogen is acceptable.
Źródło:
Wiadomości Chemiczne; 2012, 66, 3-4; 227-247
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sieci metalo-organiczne jako multifunkcjonalne materiały przyszłości : mechanochemiczne podejście do syntezy
Metal-organic frameworks as multifunctional materials of the future : mechanochemical approach to synthesis
Autorzy:
Jędrzejowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/171620.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
sieć metalo-organiczna
mechanochemia
mechanosynteza
polimery koordynacyjne
chemia koordynacyjna
materiały porowate
materiały multifunkcjonalne
metal-organic frameworks
mechanochemistry
mechanosynthesis
coordination polymer
coordination chemistry
porous materials
multifunctional materials
Opis:
Metal-organic frameworks (MOFs) are a relatively new class of advanced inorganic-organic materials. Due to their modular structures and possible incorporation of various properties, that materials find more and more applications in many fields of science and industry. MOFs are coordination polymers, i.e. compounds with coordination bonds propagating infinitely in at least one dimension. Their characteristic feature is the presence of potential free spaces, i.e. pores. The free spaces often appear after proper activation, e.g. thermal activation. Other common properties of MOFs include for instance large specific surface areas and pore volumes, modifiable size and chemical environment of the pores, and network flexibility. All these properties result in the use of MOFs in e.g. selective sorption, separation or storage of gases, heterogeneous catalysis, design and fabrication of sensors, etc. During more than twenty years of the history of MOFs, many methods of their synthesis have been developed, including the most popular in solution at elevated temperatures (e.g. solvothermal method). Nevertheless, the activity of pro-ecological environments and the requirements set by international organizations encourage scientists to create new methods of synthesis, which, according to the guidelines presented by the 12 principles of green chemistry, will be safer, less aggressive, less toxic and less energy-consuming. One of the answers to meet these requirements is the use of mechanosynthesis. Mechanochemical synthesis relies on the supply of energy to a system by mechanical force, by grinding or milling. By combining or transforming solids in this way, the presence of a solvent, which is most often the main source of contamination and waste, can be minimised or completely excluded. Mechanical force is typically used for purposes other than MOF synthesis, e. g. catalyst grinding. Nevertheless, the use of mechanical force in synthesis is becoming more and more popular. The most important advantages of this approach, apart from its environmental impact, are very high efficiency (usually close to 100%) and drastically reduced reaction time. Of course, there are examples where these advantages are not observed. In such cases, mechanosynthetic modifications are introduced, such as e.g. addition of small amount of liquid (Liquid-Assisted Grinding) and/or a small addition of simple inorganic salt (Ion- and Liquid-Assisted Grinding). Furthermore, new instrument setups are being developed to monitor reaction mixtures in situ during mechanosynthesis, e.g. by use of such techniques as powder X-ray diffraction and Raman spectroscopy. This enables valuable insights into mechanisms and allows for mechanosynthesis optimization.
Źródło:
Wiadomości Chemiczne; 2018, 72, 9-10; 645-666
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Otrzymywanie i właściwości adsorpcyjne sieci metaloorganicznych
Synthesis and adsorption properties of metal-organic frameworks
Autorzy:
Szeligowska, S.
Choma, J.
Jaroniec, M.
Powiązania:
https://bibliotekanauki.pl/articles/171540.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
sieci metaloorganicze
MOF
synteza materiałów MOF
adsorpcja
CO2
adsorpcja H2
metal-organic frameworks
synthesis of MOF materials
adsorption
H2 adsorption
Opis:
MOF materials or metal-organic frameworks are compounds consisting of metal ions or clusters (metal junctions) and organic ligands (bridging groups) connected via coordination bonds. Since a variety of organic ligands and metal junctions is available, metal-organic frameworks of desired composition and structures can be synthesized. These compounds are relatively new, intensively studied, their number is continuously growing from year to year. Metalorganic frameworks may also possess elastic properties due to the presence of coordination bonds in their structure. A distinct feature of MOF materials, which differentiates them from other sorbents, is the possibility of changing their pore structure under influence of external stimuli and the ability of adjusting their pore size to the dimensions of the adsorbed molecules. An interesting phenomenon observed in these materials is the so-called “breathing” effect that is manifested by drastic changes in the pore volume upon external stimuli such as temperature, pressure, type of adsorbate, presence of solvent. There are numerous methods for the preparation of MOF materials: solvothermal, electrochemical, mechanochemical, sonochemical and microwave-assisted syntheses. An additional activation of these materials is often required to remove the remaining solvents from pores and consequently, increase their adsorption capacity. The latter can be also increased by additional modifications that can be used to tune their physicochemical properties, and especially porosity. Due to the excellent adsorption properties of MOF, especially very high BET specific surface area (up to 6200 m2/g) and large pore volume, these materials have been intensively studied for capture or storage of various gases such as CO2, H2 and CH4. Applications of metal-organic frameworks are continuously growing and range from gas storage, chemical sensors and phosphors to medicine, where they are used as drug carriers.
Źródło:
Wiadomości Chemiczne; 2017, 71, 5-6; 299-322
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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