scholarly journals Atoms and the void: modular construction of ordered porous solids

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
James D. Wuest
Keyword(s):  
Porous Materials ◽  
Molecular Level ◽  
Porous Solids ◽  
Modular Construction ◽  
Molecular Components ◽  
New Generation ◽  
Ordered Porous

Abstract For millennia, humans have exploited the special properties of porous materials. Advances in recent years have yielded a new generation of finely structured porous materials that allow processes to be controlled at the molecular level. These materials are built by a strategy of modular construction, using molecular components designed to position their neighbors in ways that create predictable voids.

Introduction to the themed issue in honor of Dr François Fajula: “An exciting journey in the creative world of ordered porous materials and their applications”

2016 ◽  
Vol 40 (5) ◽  
pp. 3930-3932 ◽  
Author(s):  
Anne Galarneau ◽  
Irina I. Ivanova
Keyword(s):  
Porous Materials ◽  
Porous Solids ◽  
Ordered Porous

This themed issue, dedicated to François Fajula, includes the latest achievements in the field of ordered porous solids, which is among the most creative, fascinating and attractive fields of chemistry.

scholarly journals Molecular-Level Investigation of Cycloaliphatic Epoxidised Ionic Liquids as a New Generation of Monomers for Versatile Poly(Ionic Liquids)

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1512
Author(s):  
Baris Demir ◽  
Gabriel Perli ◽  
Kit-ying Chan ◽  
Jannick Duchet-Rumeau ◽  
Sébastien Livi
Keyword(s):  
Ionic Liquids ◽  
Molecular Level ◽  
Computational Approach ◽  
Polymer Materials ◽  
Chemical Structures ◽  
Cycloaliphatic Epoxy ◽  
Polymer Models ◽  
Mechanical Performances ◽  
Dynamics Simulations ◽  
New Generation

Recently, a new generation of polymerised ionic liquids with high thermal stability and good mechanical performances has been designed through novel and versatile cycloaliphatic epoxy-functionalised ionic liquids (CEILs). From these first promising results and unexplored chemical structures in terms of final properties of the PILs, a computational approach based on molecular dynamics simulations has been developed to generate polymer models and predict the thermo–mechanical properties (e.g., glass transition temperature and Young’s modulus) of experimentally investigated CEILs for producing multi-functional polymer materials. Here, a completely reproducible and reliable computational protocol is provided to design, test and tune poly(ionic liquids) based on epoxidised ionic liquid monomers for future multi-functional thermoset polymers.

New generation of nitric oxide-releasing porous materials: Assessment of their potential to regulate biological functions

Nitric Oxide ◽  
2019 ◽  
Vol 90 ◽  
pp. 29-36 ◽  
Author(s):  
Rosana V. Pinto ◽  
Ana C. Fernandes ◽  
Fernando Antunes ◽  
Zhi Lin ◽  
João Rocha ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Porous Materials ◽  
Biological Functions ◽  
Nitric Oxide Releasing ◽  
New Generation

Capillarity in Soft Porous Solids

2020 ◽  
Vol 52 (1) ◽  
pp. 263-284 ◽  
Author(s):  
Jonghyun Ha ◽  
Ho-Young Kim
Keyword(s):  
Porous Media ◽  
Porous Materials ◽  
Porous Solids ◽  
Resurrection Plants ◽  
Wetting And Drying ◽  
Practical Applications ◽  
Capillary Interactions ◽  
Soft Porous Media ◽  
Experimental Findings ◽  
Physical Principles

Soft porous solids can change their shapes by absorbing liquids via capillarity. Such poro-elasto-capillary interactions can be seen in the wrinkling of paper, swelling of cellulose sponges, and morphing of resurrection plants. Here, we introduce physical principles relevant to the phenomena and survey recent advances in the understanding of swelling and shrinkage of bulk soft porous media due to wetting and drying. We then consider various morphing modes of porous sheets, which are induced by localized wetting and swelling of soft porous materials. We focus on physical insights with the aim of triggering novel experimental findings and promoting practical applications.

Mechanical Analysis of Functionally Graded Porous Structures: A Review

2020 ◽  
Vol 20 (13) ◽  
pp. 2041015
Author(s):  
Helong Wu ◽  
Jie Yang ◽  
Sritawat Kitipornchai
Keyword(s):  
Porous Materials ◽  
Material Properties ◽  
Mechanical Analysis ◽  
Functionally Graded ◽  
Future Research ◽  
Spatial Gradient ◽  
Porous Structures ◽  
Research Activities ◽  
Key Factor ◽  
New Generation

Functionally graded porous structures (FGPSs), characterized by a continuous spatial gradient in both porosity and material properties, have been considered as the new generation lightweight structures. Research activities on FGPSs have grown rapidly in recent years. This paper is devoted to review the existing research works on FGPSs and to highlight the important advances in this emerging area. It consists of: (i) a brief introduction of porous materials and Functionally graded porous materials (FGPMs); (ii) an elaboration of the key factor and micromechanical models related to material properties of FGPMs; (iii) a comprehensive review of mechanical analysis of FGPSs; (iv) a detailed discussion of the main challenges and future research directions; (v) a conclusion.

scholarly journals Smart covalent organic networks (CONs) with “on-off-on” light-switchable pores for molecular separation

2020 ◽  
Vol 6 (34) ◽  
pp. eabb3188 ◽  
Author(s):  
Jiangtao Liu ◽  
Shaofei Wang ◽  
Tiefan Huang ◽  
Priyanka Manchanda ◽  
Edy Abou-Hamad ◽  
...  
Keyword(s):  
Visible Light ◽  
Molecular Level ◽  
Uv Light ◽  
Building Blocks ◽  
Membrane Selectivity ◽  
Molecular Separation ◽  
Stimuli Response ◽  
Dye Rejection ◽  
New Generation ◽  
Azobenzene Derivatives

Development of the new-generation membranes for tunable molecular separation requires materials with abilities beyond strict separation. Stimuli response could remotely adjust the membrane selectivity. Azobenzene derivatives can be photo-switched between trans and cis isomers under ultraviolet or visible light. Here, the azobenzenes were implanted as light switches to bridge the flexible cyclen building blocks. The smart covalent organic network membranes fold and unfold as origami that can be photo-switched between on-state (large) and off-state (small) pores. The cis membranes with off state under ultraviolet (UV) light have higher dye rejection than trans membranes with on-state channels. By controlling the trans-to-cis azobenzene isomerization via UV/Vis light, the pore size can be remotely controlled at the molecular level and the solvent permeance and dye rejection can be dynamically tuned.

scholarly journals Organic synthesis of high added value molecules with MOF catalysts

2020 ◽  
Vol 18 (40) ◽  
pp. 8058-8073
Author(s):  
Nuria Martín ◽  
Francisco G. Cirujano
Keyword(s):  
Organic Synthesis ◽  
Added Value ◽  
Porous Solids ◽  
Fine Chemicals ◽  
Confined Spaces ◽  
Ordered Porous

Recent examples of organic synthesis of fine chemicals and pharmaceuticals in confined spaces of MOFs are highlighted and compared with silica-based ordered porous solids, such as zeolites or mesoporous (organo)silica.

scholarly journals Beyond switches: Rotaxane- and catenane-based synthetic molecular motors

2008 ◽  
Vol 80 (1) ◽  
pp. 17-29 ◽  
Author(s):  
Euan R. Kay ◽  
David A. Leigh
Keyword(s):  
Molecular Motors ◽  
Physical Science ◽  
Statistical Physics ◽  
Biological Process ◽  
Molecular Level ◽  
Molecular Machines ◽  
Interlocked Molecules ◽  
Recent Developments ◽  
New Generation ◽  
First Time

Nature uses molecular motors and machines in virtually every significant biological process, but learning how to design and assemble simpler artificial structures that function through controlled molecular-level motion is a major challenge for contemporary physical science. The established engineering principles of the macroscopic world can offer little more than inspiration to the molecular engineer who creates devices for an environment where everything is constantly moving and being buffeted by other atoms and molecules. Rather, experimental designs for working molecular machines must follow principles derived from chemical kinetics, thermodynamics, and nonequilibrium statistical physics. The remarkable characteristics of interlocked molecules make them particularly useful for investigating the control of motion at the molecular level. Yet, the vast majority of synthetic molecular machines studied to date are simple two-state switches. Here we outline recent developments from our laboratory that demonstrate more complex molecular machine functions. This new generation of synthetic molecular machines can move continuously and progressively away from equilibrium, and they may be considered true prototypical molecular motors. The examples discussed exemplify two, fundamentally different, "Brownian ratchet" mechanisms previously developed in theoretical statistical physics and realized experimentally in molecular-level devices for the first time in these systems.

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