The Role of Shape and Size of Guest Molecules in the Formation of Clathrates and Intercalates of Syndiotactic Polystyrene

2013 ◽  
Vol 214 (17) ◽  
pp. 1901-1911 ◽  
Author(s):  
Oreste Tarallo ◽  
Finizia Auriemma ◽  
Odda Ruiz de Ballesteros ◽  
Rocco Di Girolamo ◽  
Claudia Diletto ◽  
...  
Keyword(s):  
Syndiotactic Polystyrene ◽  
Guest Molecules ◽  
Shape And Size

scholarly journals Investigating the Role of Gold Nanoparticle Shape and Size in Their Toxicities to Fungi

2018 ◽  
Vol 15 (5) ◽  
pp. 998 ◽  
Author(s):  
Kangze Liu ◽  
Zhonglei He ◽  
Hugh Byrne ◽  
James Curtin ◽  
Furong Tian
Keyword(s):  
Gold Nanoparticle ◽  
Nanoparticle Shape ◽  
Shape And Size

scholarly journals The Role of β-Cyclodextrin in the Textile Industry—Review

Molecules ◽  
2020 ◽  
Vol 25 (16) ◽  
pp. 3624 ◽  
Author(s):  
Fabricio Maestá Bezerra ◽  
Manuel José Lis ◽  
Helen Beraldo Firmino ◽  
Joyce Gabriella Dias da Silva ◽  
Rita de Cassia Siqueira Curto Valle ◽  
...  
Keyword(s):  
Smart Materials ◽  
Textile Industry ◽  
Microbial Control ◽  
Dye Adsorption ◽  
Physicochemical Characteristics ◽  
Industrial Applications ◽  
Chemical Modifications ◽  
Guest Molecules ◽  
Finishing Agent

β-Cyclodextrin (β-CD) is an oligosaccharide composed of seven units of D-(+)-glucopyranose joined by α-1,4 bonds, which is obtained from starch. Its singular trunk conical shape organization, with a well-defined cavity, provides an adequate environment for several types of molecules to be included. Complexation changes the properties of the guest molecules and can increase their stability and bioavailability, protecting against degradation, and reducing their volatility. Thanks to its versatility, biocompatibility, and biodegradability, β-CD is widespread in many research and industrial applications. In this review, we summarize the role of β-CD and its derivatives in the textile industry. First, we present some general physicochemical characteristics, followed by its application in the areas of dyeing, finishing, and wastewater treatment. The review covers the role of β-CD as an auxiliary agent in dyeing, and as a matrix for dye adsorption until chemical modifications are applied as a finishing agent. Finally, new perspectives about its use in textiles, such as in smart materials for microbial control, are presented.

The Role of Guest Molecules in the Self-Assembly of Metal-Ligand Clusters

ChemInform ◽  
2003 ◽  
Vol 34 (1) ◽  
pp. no-no
Author(s):  
Darren W. Johnson ◽  
Kenneth N. Raymond
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Guest Molecules ◽  
Metal Ligand

scholarly journals Intrinsic Flexibility of the EMT Zeolite Framework Under Pressure

2019 ◽  
Author(s):  
Antony Nearchou ◽  
Mero-Lee U. Cornelius ◽  
Jonathan M. Skelton ◽  
Zoe Jones ◽  
Andrew Cairns ◽  
...  
Keyword(s):  
Free Energy ◽  
Computational Modelling ◽  
Lattice Energy ◽  
Vibrational Entropy ◽  
Organic Additives ◽  
X Ray Diffraction ◽  
Zeolite Framework ◽  
Guest Molecules ◽  
Fau Zeolite

<p>The roles of organic additives in the assembly and crystallisation of zeolites is still not fully understood. This is important when attempting to prepare novel frameworks to produce new zeolites. We consider 18-crown-6 ether as an additive, which has previously been shown to differentiate between the EMT and FAU zeolite frameworks. However, it is unclear whether this distinction is dictated by influences on the metastable free-energy landscape or geometric templating. Using high pressure synchrotron X-ray diffraction, we have observed that the presence of 18C6 does not impact the EMT framework flexibility – agreeing with our previous geometric simulations and suggesting that 18C6 does not behave as a true geometric template. This was further studied with computational modelling, using first-principles comparative periodic DFT and lattice-dynamics calculations. It is shown that the lattice energy of FAU is more stable than EMT, however this is strongly impacted by the presence of solvent/guest molecules in the framework. Furthermore, the EMT topology possesses a greater vibrational entropy, being stabilised by free energy at finite temperature. Overall, these findings demonstrate that the role of the 18C6 additive is to influence the free-energy of crystallisation to assemble the EMT framework as opposed to FAU. </p>

scholarly journals Harnessing Electrostatic Interactions for Enhanced Conductivity in Metal-Organic Frameworks

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
An-An Zhang ◽  
Xiyue Cheng ◽  
Xu He ◽  
Wei Liu ◽  
Shuiquan Deng ◽  
...  
Keyword(s):  
Electrostatic Interaction ◽  
Electrostatic Interactions ◽  
Metal Organic Frameworks ◽  
Electron Conduction ◽  
Guest Molecules ◽  
Type Semiconductor ◽  
Metal Organic ◽  
Application Potential ◽  
Enhanced Conductivity

The poor electrical conductivity of metal-organic frameworks (MOFs) has been a stumbling block for its applications in many important fields. Therefore, exploring a simple and effective strategy to regulate the conductivity of MOFs is highly desired. Herein, anionic guest molecules are incorporated inside the pores of a cationic MOF (PFC-8), which increases its conductivity by five orders of magnitude while maintaining the original porosity. In contrast, the same operation in an isoreticular neutral framework (PFC-9) does not bring such a significant change. Theoretical studies reveal that the guest molecules, stabilized inside pores through electrostatic interaction, play the role of electron donors as do in semiconductors, bringing in an analogous n-type semiconductor mechanism for electron conduction. Therefore, we demonstrate that harnessing electrostatic interaction provides a new way to regulate the conductivity of MOFs without necessarily altering the original porous structure. This strategy would greatly broaden MOFs’ application potential in electronic and optoelectronic technologies.

Role of Guest Molecules in the Mechanical Properties of Clathrate Hydrates

2018 ◽  
Vol 18 (11) ◽  
pp. 6729-6741 ◽  
Author(s):  
Qiao Shi ◽  
Pinqiang Cao ◽  
Zhengde Han ◽  
Fulong Ning ◽  
Hao Gong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Clathrate Hydrates ◽  
Guest Molecules
Sign in / Sign up

Export Citation Format

Share Document