D–A polymers for fluorescence/photoacoustic imaging and characterization of their photothermal properties

Zhu, Yaowei; Gu, Chuantao; Miao, Yawei; Yu, Bing; Shen, Youqing; Cong, Hailin

doi:10.1039/c9tb01196j

Cited by 45 publications

(36 citation statements)

References 40 publications

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“…[41] Whereas, Langmuir isotherm model is usually associated with ionic substrates (metal cations) adsorption with weak competition from the solvent molecules. [42] For lower concentration, the Langmuir isotherm model has been found to be more satisfactory, while the adsorption index (0.1 < 1/n < 0.5) of Freundlich isotherm model means that adsorption intensity is favorable at high concentrations. [43] Therefore, it can be concluded that the high adsorption capacity of AMP-PAN towards Rb(I) ion.…”

Section: Adsorption Isothermmentioning

confidence: 96%

Preconcentration and Separation of Rubidium from Salt Lake Brine by Ammonium Phosphomolybdate - Polyacrylonitrile (AMP-PAN) Composite Adsorbent

et al. 2017

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In this study, a novel composite adsorbent of ammonium phosphomolybdate – polyacrylonitrile (AMP–PAN) was prepared for sensitive and selective preconcentration and separation of rubidium (Rb(I)) ion from salt lake brine. Several experimental parameters, such as pH value, shaking time, concentration, interference ions, regeneration, stability and reusability were systematically investigated. The experimental results clarified that the Rb(I) ion was adsorbed by the adsorbent of AMP‐PAN at pH 7. Under optimum condition, the maximum sorption capacity for Rb(I) ion by the adsorbent was 500 mg g−1 based on the Langmuir adsorption isotherm study. The adsorption equilibrium was achieved within 2 h. The presence of co‐existing ions did not interfere with Rb(I) adsorption, indicating the high selectivity toward Rb(I) ion. The desorption results demonstrated that Rb(I) ion adsorbed the composite adsorbent of AMP‐PAN could be effectively desorbed by 0.5 mol L−1 NH4Cl and regenerated into the initial form without significant deterioration in its original functionality at the same time, which exhibited good stability of the adsorbent. Therefore, the proposed adsorbent of AMP‐PAN allowed the sensitive, selective, easy to use, cost‐effective, high efficiency, fast kinetics, stable and reusability preconcentation and separation of Rb(I) ion even in the presence of competing ions. As a consequence, the AMP‐PAN adsorbent can be used potentially to preconcentration and separation of Rb(I) ion from water samples in a wide range of practical applications for extracting Rb(I) ion in environmental aqueous resources.

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Section: Adsorption Isothermmentioning

confidence: 96%

Preconcentration and Separation of Rubidium from Salt Lake Brine by Ammonium Phosphomolybdate - Polyacrylonitrile (AMP-PAN) Composite Adsorbent

et al. 2017

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“…Dyes such as melanin [33,34] and porphyrin derivatives [35,36] react with other polymers to improve the PA signal. Polymers that have been employed as contrast agents include protein [37,38], phospholipid [39] and biodegradable polymers [40,41]. These polymers can be used in the form of NPs via precipitation and dispersion, which leads to self-assembly, and in the form of dots.…”

Section: Organic Pa Contrast Agentsmentioning

confidence: 99%

“…Zhu et al developed contrast agent NPs using 1,2-distearoyl-sn-glycero-3-phosphoeth anolamine-N-[methoxy(polyethylene glycol)-2000] (DSPE-mPEG2000), octyl 4,6-dibromoth ieno [3,4-b]thiophene-2-carboxylate (TT) and 3,6-bis(5-bromothiophen-2-yl)-2,5-bis(2-ethylh exyl) pyrrolo [3,4-c]pyrrole-1,4(2H,5H)-dione (DPP) [39]. They conjugated DSPE-mPEG2000 with TT or DPP to form P-TT and P-DPP, respectively.…”

Section: Organic Pa Contrast Agentsmentioning

confidence: 99%

Types/Applications of Photoacoustic Contrast Agents: A Review

et al. 2021

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Ultrasound imaging, one of the common diagnosis techniques, is frequently used since it is safe, cost-efficient technique and real-time imaging can be conducted. However, various organs and tissues reflect ultrasonic waves, which leads to difficulty in imaging small biomolecules and to a low spatial resolution for deep-tissue images. As such, there have been significant advances in photonics and optical molecular probes in recent years, and photoacoustic (PA) tomography (PAT) has emerged as a promising modality that can overcome the limitations of ultrasound. PAT relies on the photoacoustic effect, which is the conversion of absorbed optical energy into acoustic energy. Since fewer biomolecules exhibit the photoacoustic effect compared to the scattering or reflection of ultrasound, PAT can be employed to generate high-resolution images. PAT also has a number of other advantages when compared to conventional biomedical imaging modalities such as optical tomography, ultrasound imaging, computed tomography, positron emission tomography and magnetic resonance imaging. This review provides a general overview of the contrast agents used for PAT, including organic, inorganic and hybrid contrast agents, and describes their application. This review also identifies limitations of current PAT contrast agents and suggests future research directions for their development.

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“…31 SWIR°uorescent probes are expected to have good biocompatibility, high°uorescence quantum e±ciency, and adjustable excitation and emission wavelengths in the short-wave infrared region. 32,33 Under these considerations, conjugated polymers with donor-acceptor (D-A) structure are ideal materials for constructing short-wave infrared°u orescent probes. Moreover, their optical properties could be easily adjusted by changing the main backbone or side chain structure.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a dithieno[3,2-b:2′,3′-d]silole-based conjugated polymer and characterization of its short wave near-infrared fluorescence properties

Zheng

Liu

et al. 2020

J. Innov. Opt. Health Sci.

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Short wave near-infrared (SWIR, 900–1700[Formula: see text]nm) fluorescence imaging has attracted extensive research interest from scientists due to its high imaging quality. However, the variety of SWIR fluorescence imaging agents are quite limited and the corresponding quantum efficiency is relatively low. In this work, a novel conjugated polymer PDTSDTBT was reported, consisting of a donor unit with a tetrahedral Si (sp3) named DTS and an acceptor unit named DTBT with branched side chains. The design approach of endowing the donor–acceptor structure with the branched side chains successfully increase the fluorescence quantum efficiency. The polymer was prepared into nanoparticles by nanoprecipitation. The PDTSDTBT nanoparticles showed an absorption peak of 626[Formula: see text]nm and fluorescence emission peak of 924[Formula: see text]nm. The quantum efficiency of the nanoparticles is 0.53%, which is higher than that of nanotube fluorophores (0.4%). The nanoparticles also demonstrate a photothermal effect, the temperature of nanoparticles solution could reach [Formula: see text]C under excitation by 660[Formula: see text]nm laser. Therefore, the PDTSDTBT nanoparticles is an excellent fluorescent imaging agent with potential photothermal applications.

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D–A polymers for fluorescence/photoacoustic imaging and characterization of their photothermal properties

Abstract: Two D–A polymers with good NIR-II fluorescence, photoacoustic and photothermal properties were designed and synthesized.

Cited by 45 publications

References 40 publications

Preconcentration and Separation of Rubidium from Salt Lake Brine by Ammonium Phosphomolybdate - Polyacrylonitrile (AMP-PAN) Composite Adsorbent

Preconcentration and Separation of Rubidium from Salt Lake Brine by Ammonium Phosphomolybdate - Polyacrylonitrile (AMP-PAN) Composite Adsorbent

Types/Applications of Photoacoustic Contrast Agents: A Review

Synthesis of a dithieno[3,2-b:2′,3′-d]silole-based conjugated polymer and characterization of its short wave near-infrared fluorescence properties

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