نتایج جستجو برای: nano metal organic frameworks

تعداد نتایج: 461860  

Journal: :Angewandte Chemie 2016
Lei Sun Michael G Campbell Mircea Dincă

Owing to their outstanding structural, chemical, and functional diversity, metal-organic frameworks (MOFs) have attracted considerable attention over the last two decades in a variety of energy-related applications. Notably missing among these, until recently, were applications that required good charge transport coexisting with porosity and high surface area. Although most MOFs are electrical ...

2015
Victor Borovkov

Metal-organic frameworks (MOFs) are chemical systems comprising organic molecules coordinated to metal ions or clusters to form one-, two-, or three-dimensional structural arrangement (Figure 1). The use of lanthanide (Ln) ions results in a specific class of Ln-MOFs possessing unique physico-chemical properties owing to a large atomic magnetic moment, strong spin-orbital coupling, high coordina...

2016
Sonja Pullen Sascha Ott

Metal–Organic Frameworks (MOFs) have attracted increasing attention for the creation of solid-state platforms for catalysis applications. In this review article, we present strategies to employ MOF-based materials in photochemical hydrogen production. The scope ranges from the incorporation of single functions (catalyst or photosensitizer) to multifunctional MOFs that combine both light-harvest...

Journal: :Chemical communications 2015
Claudia Orellana-Tavra Emma F Baxter Tian Tian Thomas D Bennett Nigel K H Slater Anthony K Cheetham David Fairen-Jimenez

We report the encapsulation of the hydrophilic model molecule calcein in the Zr-based MOF UiO-66, followed by amorphization of the framework by ball-milling. We show controlled release of calcein over more than 30 days, compared with the 2 day release period from crystalline UiO-66.

Journal: :Nature chemistry 2012
V Nicholas Vukotic Kristopher J Harris Kelong Zhu Robert W Schurko Stephen J Loeb

The dynamics of mechanically interlocked molecules such as rotaxanes and catenanes have been studied in solution as examples of rudimentary molecular switches and machines, but in this medium, the molecules are randomly dispersed and their motion incoherent. As a strategy for achieving a higher level of molecular organization, we have constructed a metal-organic framework material using a [2]ro...

2014
Zoey R. Herm Eric D. Bloch Jeffrey R. Long

New materials capable of separating mixtures of saturated, unsaturated, and aromatic hydrocarbons can enable more efficient industrial processes and cleaner energy. Outstanding challenges in hydrocarbon separations stem from the similar structures, properties, and reactivities of the molecules comprising many of these mixtures. With high surface areas, tunable pore geometries, and adjustable su...

Journal: :Acta crystallographica Section B, Structural science, crystal engineering and materials 2015
François Xavier Coudert

Metal-organic frameworks (MOFs) demonstrate a wide variety of behavior in their response to pressure, including anomalous mechanical properties, negative linear compressibility, pressure-induced crystal-to-crystal and crystal-to-amorphous structural transitions. The discovery of framework materials combining novel pressure responses and high mechanical stability is key in the quest for applicat...

Journal: :Journal of the American Chemical Society 2014
Lev Sarkisov Richard L Martin Maciej Haranczyk Berend Smit

Occasional, large amplitude flexibility in metal-organic frameworks (MOFs) is one of the most intriguing recent discoveries in chemistry and material science. Yet, there is at present no theoretical framework that permits the identification of flexible structures in the rapidly expanding universe of MOFs. Here, we propose a simple method to predict whether a MOF is flexible, based on treating i...

Journal: :Angewandte Chemie 2012
Ali Coskun Mohamad Hmadeh Gokhan Barin Felipe Gándara Qiaowei Li Eunwoo Choi Nathan L Strutt David B Cordes Alexandra M Z Slawin J Fraser Stoddart Jean-Pierre Sauvage Omar M Yaghi

The incorporation of mechanically interlocked molecules (MIMs), such as rotaxanes and catenanes, into porous metal– organic frameworks (MOFs) has recently been recognized as a strategy for introducing dynamics into otherwise rigid, robust frameworks. In this manner, the interlocked nature of these switchable components allows dynamics to be expressed independently of the MOF backbone and, there...

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