Abstract
The first measurements of magnetic correlation functions are presented using time-of-flight Spin-echo modulated small angle neutron scattering (SEMSANS) on the Larmor instrument at the ISIS pulsed neutron source. The accessible length scale is beyond that of the conventional SANS. A simplified model is presented to calculate the expected correlation functions for various magnetisation fields applied to the sample. As an example, we present the experimental data of a soft iron sample at various configurations of magnetisation field.
Highlights
The hybrid nature of metal−organic frameworks (MOFs) goes hand in hand with diverse and often complex behavior
The dynamic traits of these materials are increasingly capturing the curiosity of researchers in the field: MOFs show the potential of displaying intricate dynamics, similar to that observed in other materials built from closely interacting molecules such as crowded movement of proteins in lipid bilayers[1,2] or concerted molecular motion in liquid crystals.[3]
It has become evident that stable frameworks that display inherent rotational motion are ubiquitous.[9−11] not all such frameworks are usable in practice, and the performance of a MOF in specific applications is highly dependent on its dynamic properties, a prime example being adsorption behavior in flexible MOFs.[12−17] MOF-based crystalline molecular machines will require external control of linker motion, making the engineering of correlated dynamics a necessary step to achieve cooperative functional mobility.[5,6,18,19]
Summary
The hybrid nature of metal−organic frameworks (MOFs) goes hand in hand with diverse and often complex behavior. A decade ago, Yaghi and Stoddart proposed that “robust dynamics” could be achieved by mechanically interlocking organic components onto the linkers, such that they have the necessary freedom of mobility without compromising the MOF structure.[8] Since it has become evident that stable frameworks that display inherent rotational motion are ubiquitous.[9−11] not all such frameworks are usable in practice, and the performance of a MOF in specific applications is highly dependent on its dynamic properties, a prime example being adsorption behavior in flexible MOFs.[12−17] MOF-based crystalline molecular machines will require external control of linker motion, making the engineering of correlated dynamics a necessary step to achieve cooperative functional mobility.[5,6,18,19]. The growing field of rotor-MOFs may benefit from inspiration drawn from the more developed field of crystalline molecular rotors In many such systems, it has been found that in structures where rotor−rotor distances are small enough, the resulting steric interactions force the rotational dynamics to adopt correlated gear-like mechanisms.[26−29] Here, we present. Terephthalate-based organic linkers are very common among MOFs
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
