Role of Host-Guest Interaction in Understanding Polymerisation in Metal-Organic Frameworks

Metal-organic frameworks, MOFs, offer an effective template for polymerisation of polymers with precisely controlled structures within the sub-nanometre scales. However, synthetic difficulties such as monomer infiltration, detailed understanding of polymerisation mechanisms within the MOF nanochannels and the mechanism for removing the MOF template post polymerisation have prevented wide scale implementation of polymerisation in MOFs. This is partly due to the significant lack in understanding of the energetic and atomic-scale intermolecular interactions between the monomers and the MOFs. Consequently in this study, we explore the interaction of varied concentration of styrene, and 3,4-ethylenedioxythiophene (EDOT), at the surface and in the nanochannel of Zn2(1,4-ndc)2 (dabco), where 1,4-ndc = 1,4-naphthalenedicarboxylate and dabco = 1,4-diazabicyclo[2.2.2]octane. Our results showed that the interactions between monomers are stronger in the nanochannels than at the surfaces of the MOF. Moreover, the MOF-monomer interactions are strongest in the nanochannels and increase with the number of monomers. However, as the number of monomers increases, the monomers turn to bind more strongly at the surface leading to a potential agglomeration of the monomers at the surface.

Role of Host-Guest Interaction in Understanding Polymerisation in Metal Organic Frameworks

<div>Metal-organic frameworks, MOFs, offer an effective templet for</div><div>polymerisation of polymers with precisely controlled structures</div><div>within the sub-nanometre scales. However, synthetic difficulties</div><div>such as monomer infiltration, detailed understanding of polymerisation</div><div>mechanisms within the MOF nano-channels and the</div><div>mechanism for removing the MOF template post polymerisation</div><div>have prevented wide scale implementation of polymerisation in</div><div>MOFs. This is partly due to the significant lack in understanding</div><div>of the energetic and atomic-scale intermolecular interactions</div><div>between the monomers and the MOFs. Consequently in this study,</div><div>we explore the interaction of varied concentration of styrene,</div><div>and EDOT, at the surface and in the nano-channel of Zn2(1,4-</div><div>ndc)2(dabco), where 1,4-ndc = 1,4-naphthalenedicarboxylate</div><div>and dabco = 1,4-diazabicyclo[2.2.2]octane. Our results showed</div><div>that the interactions between monomers are stronger in the</div><div>nano-channels than at the surfaces of the MOF. Moreover, the</div><div>MOF-monomer interactions are strongest in the nano-channels</div><div>and increases with increase in the number of monomers. However,</div><div>as the number of monomer increases, the monomers turn to bind</div><div>more strongly at the surface leading to a potential agglomeration</div><div>of the monomers at the surface.</div>

Role of Host-Guest Interaction in Understanding Polymerisation in Metal Organic Frameworks

<div>Metal-organic frameworks, MOFs, offer an effective templet for</div><div>polymerisation of polymers with precisely controlled structures</div><div>within the sub-nanometre scales. However, synthetic difficulties</div><div>such as monomer infiltration, detailed understanding of polymerisation</div><div>mechanisms within the MOF nano-channels and the</div><div>mechanism for removing the MOF template post polymerisation</div><div>have prevented wide scale implementation of polymerisation in</div><div>MOFs. This is partly due to the significant lack in understanding</div><div>of the energetic and atomic-scale intermolecular interactions</div><div>between the monomers and the MOFs. Consequently in this study,</div><div>we explore the interaction of varied concentration of styrene,</div><div>and EDOT, at the surface and in the nano-channel of Zn2(1,4-</div><div>ndc)2(dabco), where 1,4-ndc = 1,4-naphthalenedicarboxylate</div><div>and dabco = 1,4-diazabicyclo[2.2.2]octane. Our results showed</div><div>that the interactions between monomers are stronger in the</div><div>nano-channels than at the surfaces of the MOF. Moreover, the</div><div>MOF-monomer interactions are strongest in the nano-channels</div><div>and increases with increase in the number of monomers. However,</div><div>as the number of monomer increases, the monomers turn to bind</div><div>more strongly at the surface leading to a potential agglomeration</div><div>of the monomers at the surface.</div>

Performance of Optimum Tuned PID Controller with Different Feedback Strategies on Active-Controlled Structures

In this study, multi-story structures with different combinations (on each floor and only the first floor) of active tendon control systems driven by a proportional–integral–derivative (PID) controller were actively controlled. The PID parameters, Kp (proportional gain), Td (derivative gain), and Ti (integral gain) for each structure, were optimally tuned by using both the harmony search algorithm (HS) and flower pollination algorithm (FPA), which are metaheuristic algorithms. In two different active-controlled structures, which are formed according to the position of the PID, the structural responses under near-fault records defined in FEMA P-695 are examined to determine the appropriate feedback which was applied for displacement, velocity, acceleration, and total acceleration. The performance of the different feedback strategies on these two active-controlled structures is evaluated. As a result, the acceleration feedback is suitable for all combinations of the active control system with a PID controller. The HS algorithm outperforms the optimum results found according to the FPA.