Revealing fast proton transport in condensed matter by means of density scaling concept

Herein, we investigate the charge transport and structural dynamics in the supercooled and glassy state of protic ionic material with an efficient interionic Grotthuss mechanism. We found that superprotonic properties of studied acebutolol hydrochloride (ACB-HCl) depend on thermodynamic conditions with the most favorable regions being close to the glass-transition temperature (Tg) and glasstransition pressure (Pg). To quantify the contribution of fast proton hopping to overall charge transport over a broad T−P space, we employed the density scaling concept, one of the most important experimental findings in the field of condensed matter physics. We found that isothermal and isobaric dc-conductivity (σdc) and dynamic light scattering (τα) data of ACB-HCl plotted as a function of (TVγ)−1 satisfy the thermodynamic scaling criterion with the ratio γσ/γα appearing as a new measure of fast charge transport in protic ionic glass-formers in the T−P plane. Such a universal factor becomes an alternative to the well-known Walden rule being limited to ambient pressure conditions

Can the scaling behavior of electric conductivity be used to probe the self-organizational changes in solution with respect to the ionic liquid structure? The case of [C8MIM][NTf2]

Scaling exponent as a key parameter to probe self-organization changes in solution with respect to the IL structure.</p

Miscibility, phase morphology, thermomechanical, viscoelastic and surface properties of poly(ϵ-caprolactone) modified epoxy systems: effect of curing agents

In this paper, we report on the effect of curing agents on the miscibility, morphology,. thermomechanical properties, and surface hydrophobicity of diglycidyl ether of bisphenol A (DGEBA)/poly(epsilon-caprolactone) (PCL) blends. Two curing agents, 4,4'-diamino diphenylsulfone,(DDS);and 4,4'-diainino diphenylmethane (DDM), were, used. Studies revealed that the epoxy/PCL/DDM system was completely miscible due to the intermolecular hydrogen bonding interactions between carbonyl groups Of PCL; and hydroxyl groups of epoxy resin. On the other hand, the epoxy/PCL/DDS system exhibited phase separated. matrix/droplet type-morphology, primarily due to the intramolecular hydrogen bonding interactions within the epoxy phase between sulfonyl groups of DDS and hydroxyl groups generated during epoxy DDS reaction. The storage modulus of the epoxy/PCL/DDM system was greater than that of the epoxy/PCL/DDS system, and the dependence Of modulus on PCL content was,more pronounced, in the former. Moreover, the epoxy/PCL/DDM system exhibited better tensile properties and thermal-stability

A bottom-up approach to design wearable and stretchable smart fibers with organic vapor sensing behaviors and energy storage properties

Realizing the best way to integrate electronics and textiles to develop smart wearable, functional apparel with multiple functionalities such as fibers with a unified capability to store and utilize energy is a significant topic of concern recently. Therefore, presenting a facile approach to obtain fibers with such unique properties in a continuous process is a forward contributing step towards the development of this field. Herein, a bottom-up approach to fabricate stretchable poly(styrene-butadiene-styrene)/few-layer graphene composite (SBS-G) fibers with unique organic vapor sensing behaviors and modified SBS-G fibers coated with electroactive carbon black (CB) nanofibers via modified electrospinning with excellent energy storage properties is presented. Unlike conventional conductive polymer composites (CPCs) that respond only to polar or non/low-polar organic vapors, the fabricated SBS-G composite fibers exhibited high sensitivity, excellent reversibility, and reproducibility as well as fast response to both polar and non/low-polar organic vapors. Moreover, the modified nanofiber-based SBS-G fibers demonstrated a high capacitive performance (78 F cm−3), energy and power density (6.6 mW h cm3 and 692 mW cm3) and excellent flexibility. This study provides guidelines for the fabrication of ideal organic vapor sensors based on polymer composite fibers and an approach to modify any “off-the-shelf fiber” for fiber-based power storage.The authors are very much grateful for the funds from the Science and Technology Commission of Shanghai Municipality (16JC1400700), the National Key Research and Development Program of China (2016YFA0201702/2016YFA0201700), the “Chenguang Program” supported by the Shanghai Education Development Foundation, the Shanghai Municipal Education Commission (15CG32), the National Natural Science Foundation of China (Grant No. 51673088), the Fundamental Research Funds for the Central Universities, the DHU Distinguished Young Professor Program, the Program for Innovative Research Team in University of Ministry of Education of China (IRT_16R13), and the Program of Introducing Talents of Discipline to Universities (No. 111-2-04)