Intermolecular forces between low generation PAMAM dendrimer condensed DNA helices: role of cation architecture

Soft Matter ◽  
2014 ◽  
Vol 10 (4) ◽  
pp. 590-599 ◽  
Author(s):  
Min An ◽  
Sean R. Parkin ◽  
Jason E. DeRouchey
Keyword(s):  
Intermolecular Forces ◽  
Pamam Dendrimer ◽  
Condensed Dna

scholarly journals Influence of the Electrolyte Salt Concentration on DNA Detection with Graphene Transistors

Biosensors ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 24
Author(s):  
Agnes Purwidyantri ◽  
Telma Domingues ◽  
Jérôme Borme ◽  
Joana Rafaela Guerreiro ◽  
Andrey Ipatov ◽  
...  
Keyword(s):  
Phosphate Buffer ◽  
Species Interactions ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Limit Of Detection ◽  
Debye Length ◽  
Intermolecular Forces ◽  
Single Layer Graphene ◽  
Dna Adsorption

Liquid-gated Graphene Field-Effect Transistors (GFET) are ultrasensitive bio-detection platforms carrying out the graphene’s exceptional intrinsic functionalities. Buffer and dilution factor are prevalent strategies towards the optimum performance of the GFETs. However, beyond the Debye length (λD), the role of the graphene-electrolytes’ ionic species interactions on the DNA behavior at the nanoscale interface is complicated. We studied the characteristics of the GFETs under different ionic strength, pH, and electrolyte type, e.g., phosphate buffer (PB), and phosphate buffer saline (PBS), in an automatic portable built-in system. The electrostatic gating and charge transfer phenomena were inferred from the field-effect measurements of the Dirac point position in single-layer graphene (SLG) transistors transfer curves. Results denote that λD is not the main factor governing the effective nanoscale screening environment. We observed that the longer λD was not the determining characteristic for sensitivity increment and limit of detection (LoD) as demonstrated by different types and ionic strengths of measuring buffers. In the DNA hybridization study, our findings show the role of the additional salts present in PBS, as compared to PB, in increasing graphene electron mobility, electrostatic shielding, intermolecular forces and DNA adsorption kinetics leading to an improved sensitivity.

Role of Intermolecular Forces in Defining Material Properties of Protein Nanofibrils

Science ◽  
2007 ◽  
Vol 318 (5858) ◽  
pp. 1900-1903 ◽  
Author(s):  
T. P. Knowles ◽  
A. W. Fitzpatrick ◽  
S. Meehan ◽  
H. R. Mott ◽  
M. Vendruscolo ◽  
...  
Keyword(s):  
Material Properties ◽  
Intermolecular Forces

The Role of Intermolecular Forces in the Mechanism of High-Elastic Deformation. I. The Molecular Mechanism and an Equation for the Kinetics of High Elastic Deformation

1951 ◽  
Vol 24 (2) ◽  
pp. 336-343
Author(s):  
B. A. Dogadkin ◽  
G. M. Bartenev ◽  
M. M. Reznikovskii˘
Keyword(s):  
Molecular Structure ◽  
Molecular Mechanism ◽  
Elastic Deformation ◽  
Approximate Equation ◽  
Intermolecular Forces ◽  
Joint Application ◽  
Balanced Configurations ◽  
Kinetics Of ◽  
Constant Deformation

Abstract 1. The molecular mechanism of the relaxation of deformation of high-elastic polymers has been studied. 2. It is shown that the slow relaxation, which is typical of high-elastic polymers, may be best explained as a restoration process, which either partial or complete (depending on the degree of development of side chains in the molecular structure formed by the main valence chains) of the balanced configurations of the molecular chains. 3. It is shown that the rate of the relaxation process in this case is determined by the molecular activity of the particular polymer. 4. An approximate equation for the kinetics of high-elastic deformation which expresses qualitatively the mechanical properties of high-elastic polymers is proposed. 5. Hypotheses concerning the relation between the time of relaxation and the unbalanced stress are advanced. Equation (2) is derived as characteristic of this relation. 6. It is shown that the joint application of Equations (1) and (2) makes it possible to describe qualitatively the relaxation of stress at constant deformation.

Role of Long-Range Intermolecular Forces in the Formation of Inorganic Nanoparticle Clusters

2011 ◽  
Vol 115 (45) ◽  
pp. 12933-12940 ◽  
Author(s):  
G. V. Gibbs ◽  
T. D. Crawford ◽  
A. F. Wallace ◽  
D. F. Cox ◽  
R. M. Parrish ◽  
...  
Keyword(s):  
Long Range ◽  
Intermolecular Forces ◽  
Inorganic Nanoparticle ◽  
Nanoparticle Clusters

Role of guest-host intermolecular forces in photoinduced reorientation of dyed liquid crystals

1997 ◽  
Vol 107 (23) ◽  
pp. 9783-9793 ◽  
Author(s):  
L. Marrucci ◽  
D. Paparo ◽  
P. Maddalena ◽  
E. Massera ◽  
E. Prudnikova ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Intermolecular Forces

scholarly journals Antiplasticization of Polymer Materials: Structural Aspects and Effects on Mechanical and Diffusion-Controlled Properties

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 769
Author(s):  
Leno Mascia ◽  
Yannis Kouparitsas ◽  
Davide Nocita ◽  
Xujin Bao
Keyword(s):  
Intermolecular Forces ◽  
Glassy Polymers ◽  
Polymer Materials ◽  
Additivity Rule ◽  
Thermal Transitions ◽  
Molecular Glasses ◽  
Diffusion Controlled ◽  
And Diffusion ◽  
Structural Aspects

Antiplasticization of glassy polymers, arising from the addition of small amounts of plasticizer, was examined to highlight the developments that have taken place over the last few decades, aiming to fill gaps of knowledge in the large number of disjointed publications. The analysis includes the role of polymer/plasticizer molecular interactions and the conditions leading to the cross-over from antiplasticization to plasticization. This was based on molecular dynamics considerations of thermal transitions and related relaxation spectra, alongside the deviation of free volumes from the additivity rule. Useful insights were gained from an analysis of data on molecular glasses, including the implications of the glass fragility concept. The effects of molecular packing resulting from antiplasticization are also discussed in the context of physical ageing. These include considerations on the effects on mechanical properties and diffusion-controlled behaviour. Some peculiar features of antiplasticization regarding changes in Tg were probed and the effects of water were examined, both as a single component and in combination with other plasticizers to illustrate the role of intermolecular forces. The analysis has also brought to light the shortcomings of existing theories for disregarding the dual cross-over from antiplasticization to plasticization with respect to modulus variation with temperature and for not addressing failure related properties, such as yielding, crazing and fracture toughness.

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