Optical and Electrochemical Transducers Based on Functionalized Conjugated Polymers

Leclerc, Mario

doi:10.1002/1616-8984(200011)8:1<21::aid-seup21>3.0.co;2-b

Cited by 22 publications

(32 citation statements)

References 112 publications

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“…Thermochromic polymers can be subclassified into three groups: 1) polymers which are thermochromic themselves [1][2][3][4][5][6]; 2) polymers which become thermochromic by the incorporation of a thermochromic dopant [7][8][9][10][11]; 3) polymers which become thermochromic by the interaction between the polymer matrix and the incorporated additive system [12][13][14]. Whereas polymers of the first and the second group are frequently described in literature only a few examples of the third group were reported so far.…”

Section: Introductionsupporting

confidence: 45%

Thermochromic Biopolymer Based on Natural Anthocyanidin Dyes

Lötzsch¹,

Ruhmann²,

Seeboth³

2013

OJPChem

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Recently a novel thermochromic poly(lactic acid) (PLA)-composite material was presented. Depending on temperature the incorporated anthocyanidin dye was found to be present either in its neutral or anionic anhydrobase form. A reversible formation of PLA-dye complexes triggered by conformational changes of the polymer backbone was proposed to explain this thermochromic effect. In order to study the influence of the dye structure on the PLA-dye complex formation and on the thermochromic properties of the PLA-composite material a variation of the anthocyanidin dye structure was investigated. The results indicate that a hydroxyl group in 3'-position of the anthocyanidin dye resulting in the presence of adjacent hydroxyl groups is mandatory for the PLA-anthocyanidin dye complex formation and thus for the occurrence of thermochromism.

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Section: Introductionsupporting

confidence: 45%

Thermochromic Biopolymer Based on Natural Anthocyanidin Dyes

Lötzsch¹,

Ruhmann²,

Seeboth³

2013

OJPChem

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“…This is because the HOMO and LUMO energies have a strong dependence on the degree of electron delocalization within the CP's effective conjugation length, 16 which is affected by the conformation of the backbone. 17,18 Therefore, the prediction of the HOMO/LUMO gap of a CP based on the respective HOMO/LUMO energies of the donor unit or acceptor unit is not a trivial task.…”

Section: Varying the Acceptor In Conjugated Oligomers Or Polymer For mentioning

confidence: 99%

Design principles for the energy level tuning in donor/acceptor conjugated polymers

Hashemi

Ansari

et al. 2019

Phys. Chem. Chem. Phys.

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To identify reliable molecular design principles for energy level tuning in donor/acceptor conjugated polymers (CPs), we studied the governing factors by means of ab initio calculations based on density-functional theory (DFT). We investigated a series of CPs in which we independently and systematically varied the electron withdrawing power of the acceptor unit and the electron donating power of the donor unit, while maintaining the same conjugated chain conformation. We observed that the introduction of a stronger acceptor unit, while keeping the same donor unit in the CP, lowers the LUMO level, but leaves the HOMO level almost unchanged. Conversely, enhancing the strength of the donor unit for the same acceptor unit raises the HOMO level, while maintaining the LUMO level. We identified strong correlations between the frontier orbital energy levels and the degree of orbital localization, which depends on the electron donating or withdrawing power of the molecular groups carrying the orbitals. Moreover, the HOMO/LUMO gap of the CP is directly proportional to the charge transfer between donating and accepting units, which provides a robust design criterion for CPs.

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“…Besides conductivity, PPy exhibits high thermal and environmental stability along with the ease of synthesis. 79,80 One drawback with the use of PPy as a drug delivery system is the difficulty in processing PPy due to its lack of solubility in most solvents. 81 Several studies have been conducted in an attempt to improve the solubility of PPy.…”

Section: Eaps Applied To Drug Delivery Systems and Biomedical Applicamentioning

confidence: 99%

A review of integrating electroactive polymers as responsive systems for specialized drug delivery applications

Pillay

Tsai

Choonara

et al. 2013

J Biomedical Materials Res

102

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Electroactive polymers (EAPs) are promising candidate materials for the design of drug delivery technologies, especially in conditions where an "on-off" drug release mechanism is required. To achieve this, EAPs such as polyaniline, polypyrrole, polythiophene, ethylene vinyl acetate, and polyethylene may be blended into responsive hydrogels in conjunction with the desired drug to obtain a patient-controlled drug release system. The "on-off" drug release mechanism can be achieved through the environmental-responsive nature of the interpenetrating hydrogel-EAP complex via (i) charged ions initiated diffusion of drug molecules; (ii) conformational changes that occur during redox switching of EAPs; or (iii) electroerosion. These release mechanisms are not exhaustive and new release mechanisms are still under investigation. Therefore, this review seeks to provide a concise incursion and critical overview of EAPs and responsive hydrogels as a strategy for advanced drug delivery, for example, controlled release of neurotransmitters, sulfosalicyclic acid from cross-linked hydrogel, and vaccine delivery. The review further discusses techniques such as linear sweep voltammetry, cyclic voltammetry, impedance spectroscopy, and chronoamperometry for the determination of the redox capability of EAPs. The future implications of the hydrogel-EAP composites include, but not limited to, application toward biosensors, DNA hybridizations, microsurgical tools, and miniature bioreactors and may be utilized to their full potential in the form of injectable devices as nanorobots or nanobiosensors.

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Optical and Electrochemical Transducers Based on Functionalized Conjugated Polymers

Cited by 22 publications

References 112 publications

Thermochromic Biopolymer Based on Natural Anthocyanidin Dyes

Thermochromic Biopolymer Based on Natural Anthocyanidin Dyes

Design principles for the energy level tuning in donor/acceptor conjugated polymers

A review of integrating electroactive polymers as responsive systems for specialized drug delivery applications

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