How Do Molecular Motions Affect Structures and Properties at Molecule and Aggregate Levels?

2021 ◽  
Author(s):  
Deshuang Tu ◽  
Jianyu Zhang ◽  
Yunxiao Zhang ◽  
Herman H. Y. Sung ◽  
Lijie Liu ◽  
...  
Keyword(s):  
Molecular Motions ◽  
Structures And Properties

scholarly journals How Do Molecular Motions Affect Structures and Properties at Molecule and Aggregate Levels?

2021 ◽  
Author(s):  
Deshuang Tu ◽  
Jianyu Zhang ◽  
Yunxiao Zhang ◽  
Herman H.-Y. Sung ◽  
Lijie Liu ◽  
...  
Keyword(s):  
Single Molecule ◽  
Organic Crystals ◽  
Molecular Motions ◽  
Aggregate State ◽  
Reversible Deformation ◽  
Single Molecule Level ◽  
Weak Intermolecular Interactions ◽  
Structures And Properties ◽  
Intramolecular Motions ◽  
Bright Emission

<p>Experimental and theoretical analysis demonstrated that the active intramolecular motions in the excited state of all molecules at single molecule level imparted them with more twisted structural conformations and weak emission. However, owing to the restriction of intramolecular motions in the nano/macro aggregate state, all the molecules assumed less twisted conformations with bright emission. Synergic strong and weak intermolecular interactions allowed their crystals to undergo reversible deformation, which effectively solved the problem of the brittles of organic crystals, meanwhile imparted them with excellent elastic performance. </p>

scholarly journals How Do Molecular Motions Affect Structures and Properties at Molecule and Aggregate Levels?

2021 ◽  
Author(s):  
Deshuang Tu ◽  
Jianyu Zhang ◽  
Yunxiao Zhang ◽  
Herman H.-Y. Sung ◽  
Lijie Liu ◽  
...  
Keyword(s):  
Single Molecule ◽  
Organic Crystals ◽  
Molecular Motions ◽  
Aggregate State ◽  
Reversible Deformation ◽  
Single Molecule Level ◽  
Weak Intermolecular Interactions ◽  
Structures And Properties ◽  
Intramolecular Motions ◽  
Bright Emission

<p>Experimental and theoretical analysis demonstrated that the active intramolecular motions in the excited state of all molecules at single molecule level imparted them with more twisted structural conformations and weak emission. However, owing to the restriction of intramolecular motions in the nano/macro aggregate state, all the molecules assumed less twisted conformations with bright emission. Synergic strong and weak intermolecular interactions allowed their crystals to undergo reversible deformation, which effectively solved the problem of the brittles of organic crystals, meanwhile imparted them with excellent elastic performance. </p>

Effects of Substituting B2O3 for P2O5 on the Structures and Properties of V2O5-P2O5 Glass Systems (II)

2015 ◽  
Vol 53 (3) ◽  
pp. 198-205
Author(s):  
Bong-Ki Ryu ◽  
Su-Yeon Choi ◽  
Young-Seok Kim ◽  
Jong-Hwan Kim ◽  
Jae-Yeop Jung ◽  
...  
Keyword(s):  
Structures And Properties

Study of slow molecular motions by stable-radical EPR

1978 ◽  
Vol 126 (9) ◽  
pp. 67-99 ◽  
Author(s):  
N.N. Korst ◽  
L.I. Antsiferova
Keyword(s):  
Stable Radical ◽  
Molecular Motions

Seeded Growth of Single-Crystal Two-Dimensional Covalent Organic Frameworks

2017 ◽  
Author(s):  
Austin M. Evans ◽  
Lucas R. Parent ◽  
Nathan C. Flanders ◽  
Ryan P. Bisbey ◽  
Edon Vitaku ◽  
...  
Keyword(s):  
Molecular Transport ◽  
Controlled Synthesis ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Seeded Growth ◽  
Covalent Bonds ◽  
Crystalline Materials ◽  
Step Procedure ◽  
Structures And Properties ◽  
2D Polymer

<div> <div> <div> <p>Polymerizing monomers into periodic two-dimensional (2D) networks provides structurally precise, atomically thin macromolecular sheets linked by robust, covalent bonds. These materials exhibit desirable mechanical, optoelectrotronic, and molecular transport properties derived from their designed structure and permanent porosity. 2D covalent organic frameworks (COFs) offer broad monomer scope, but are generally isolated as polycrystalline, insoluble powders with limited processability. Here we overcome this limitation by controlling 2D COF formation using a two- step procedure. In the first step, 2D COF nanoparticle seeds are prepared with approximate diameters of 30 nm. Next, monomers are slowly added to suppress new nucleation while promoting epitaxial growth on the existing seeds to sizes of several microns. The resulting COF nanoparticles are of exceptional and unprecedented quality, isolated as single crystalline materials with micron-scale domain sizes. These findings advance the controlled synthesis of 2D layered COFs and will enable a broad exploration of synthetic 2D polymer structures and properties. </p> </div> </div> </div>

Seeded Growth of Single-Crystal Two-Dimensional Covalent Organic Frameworks

2017 ◽  
Author(s):  
Austin M. Evans ◽  
Lucas R. Parent ◽  
Nathan C. Flanders ◽  
Ryan P. Bisbey ◽  
Edon Vitaku ◽  
...  
Keyword(s):  
Molecular Transport ◽  
Controlled Synthesis ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Seeded Growth ◽  
Covalent Bonds ◽  
Crystalline Materials ◽  
Step Procedure ◽  
Structures And Properties ◽  
2D Polymer

<div> <div> <div> <p>Polymerizing monomers into periodic two-dimensional (2D) networks provides structurally precise, atomically thin macromolecular sheets linked by robust, covalent bonds. These materials exhibit desirable mechanical, optoelectrotronic, and molecular transport properties derived from their designed structure and permanent porosity. 2D covalent organic frameworks (COFs) offer broad monomer scope, but are generally isolated as polycrystalline, insoluble powders with limited processability. Here we overcome this limitation by controlling 2D COF formation using a two- step procedure. In the first step, 2D COF nanoparticle seeds are prepared with approximate diameters of 30 nm. Next, monomers are slowly added to suppress new nucleation while promoting epitaxial growth on the existing seeds to sizes of several microns. The resulting COF nanoparticles are of exceptional and unprecedented quality, isolated as single crystalline materials with micron-scale domain sizes. These findings advance the controlled synthesis of 2D layered COFs and will enable a broad exploration of synthetic 2D polymer structures and properties. </p> </div> </div> </div>

Structures and Properties of Rubberlike Networks

1997 ◽  
Author(s):  
Burak Erman ◽  
James E. Mark
Keyword(s):  
Subject Matter ◽  
Rubber Elasticity ◽  
Polymer Science ◽  
Strong Emphasis ◽  
Present Book ◽  
Structures And Properties

Rubber elasticity is an important sub-field of polymer science. This book is in many ways a sequel to the authors' previous, more introductory book, Rubberlike Elasticity: A Molecular Primer (Wiley-Interscience, 1988), and will in some respects replace the now classic book by L.R.G. Treloar, The Physics of Rubber Elasticity (Oxford, 1975). The present book has much in common with its predecessor, in particular its strong emphasis on molecular concepts and theories. Similarly, only equilibrium properties are covered in any detail. Though this book treats much of the same subject matter, it is a more comprehensive, more up-to-date, and somewhat more sophisticated treatment.

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