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NIR Emission Nanoparticles Based on FRET Composed of AIE Luminogens and NIR Dyes for Two-photon Fluorescence Imaging
摘要： Near-infrared (NIR) nanoparticles (NPs) based on fluorescence resonance energy transfer (FRET) were prepared by co-encapsulation of a red aggregation-induced emission (AIE) molecule, 2-(4-bromophenyl)-3-(4-(4-(diphenylamino)styryl)phenyl)fumaronitrile (TB), and a commercial NIR fluorescence dye, silicon 2,3-naphthalocyanine bis(trihexylsilyloxide) (NIR775) with an amphiphilic polymer poly(styrene-co-maleic anhydride) (PSMA). The surface of the NPs, PSMA@TB/NIR775, was modified with poly(ethylene glycol) (PEG) to increase the in vivo biocompatibility of the NPs. The PSMA@TB/NIR775 NPs showed a strong NIR (780 nm) narrow emission and excellent two-photon absorption property. Moreover, the NPs exhibited good monodispersity, stability, and low cytotoxicity. Under the excitation of a 1040 nm femtosecond (fs) laser, the emission peaks at 680 nm of TB and 780 nm of NIR775 excited by FRET were obtained. We utilized PSMA@TB/NIR775 NPs as fluorescent contrast agents for two-photon excited NIR microscopic imaging, and good NIR imaging effect of mouse brain vasculature was obtained with the imaging depth of about 150 μm. The FRET strategy by co-encapsulating AIE molecule and NIR dye will be helpful in preparing more narrow emission NIR probes for deep-tissue biological imaging.
关键词： Two-photon imaging,FRET,NIR emission,AIE,Amphiphilic polymer
更新于2025-09-23 15:22:29
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Surface Properties of Structure-Controlled Silica Films Prepared Using Organic-Inorganic Hybrid Solutions
摘要： Silica films with various microstructures were fabricated using organic-inorganic (O-I) hybrid solutions containing a mixture of silica sols, polymethylmethacrylate (PMMA), and urethane acrylate nonionomer (UAN) as an amphiphilic polymer, The O-I hybrid solutions were prepared with various UAN:PMMA and polymer/solvent ratios, then spin-coated on glass and calcinated at 450 °C to produce silica films with various microphase-separated structures. For higher UAN and PMMA concentrations, the silica films showed spherical inorganic domains dispersed over the surface, while many pores were formed in the films with lower polymer contents (observed using scanning electron microscopy). The surface hydrophobicity of the silica films was determined using water contact angle measurements. After surface modification using (1H, 1H, 2H, 2H-perfluorooctyl)trichlorosilane solution, the hydrophobicity of films with a highly microphase-separated structure increased significantly, and all surface-modified films showed increasing hydrophobicity with increasing polymer content. Furthermore, pencil scratch hardness tests showed that the silica films formed on glass substrates could withstand the 5H scratch, test even after surface modification.
关键词： microstructure,microphase-separated structure,hydrophobicity,organic-inorganic hybrids,amphiphilic polymer
更新于2025-09-12 10:27:22
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Fabrication of highly transparent and luminescent quantum dot/polymer nanocomposite for light emitting diode using amphiphilic polymer-modified quantum dots
摘要： Herein we present the fabrication of a highly transparent and luminescent quantum dot (QD)/polymer nanocomposite for application in optoelectronic devices. First, we encapsulated CdSe@ZnS/ZnS core/shell QDs with an amphiphilic polymer, i.e., poly(styrene-co-maleic anhydride) (PSMA). By encapsulating QDs with PSMA instead of ligand exchange, the photoluminescence intensity of the QDs could be preserved even after surface modification. Next, the PSMA-modified QDs were used as crosslinkers for the aminopropyl-terminated polydimethylsiloxane (PDMS) resin in a ring-opening reaction between the maleic anhydride of the QDs and the diamines of the PDMS, producing polymer networks at a low curing temperature. This method afforded a nanocomposite with uniform dispersion of QDs even at high QD concentrations (~30 wt%) and superior optical properties compared to a nanocomposite prepared from unmodified QDs and commercial resin. Owing to these enhanced properties, the nanocomposite was used to fabricate a light emitting diode (LED) device, and the luminous efficacy was found to be highest at 1 wt%.
关键词： quantum dots,dispersion,surface modification,amphiphilic polymer,light emitting diode
更新于2025-09-12 10:27:22
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Ultrasensitive Redox-responsive Porphyrin-based Polymeric Nanoparticles for Enhanced Photodynamic Therapy
摘要： Stimulus-sensitive nanoparticles (NPs) have been established to widely adapt to remarkable abnormalities under the tumor microenvironment, which can observably enhance the therapeutic efficiency, improve the specific targeting ability and reduce the side effects. Photodynamic therapy (PDT) as a promising non-invasive and selective treatment for cancers through photodynamic reaction can profit from stimulus-sensitive NPs. Herein, a harmonious amphiphilic polymer (PEG-b-PTPPDS-b-PEG) with an extremely sensitive redox response is constructed via click chemistry between N3-TPPC6-N3, PEG-N3 and alkynyl-containing disulfide ester for PDT. This polymer can be self-assembled into micelles with excellent stability, ultra-fast sensitivity of redox-triggered porphyrin release, and significant photodynamic anticancer performance. The redox-triggered dissociation of micelles and the release of porphyrin are much faster than common porphyrin-containing polymer. The bio-distribution and phototoxicity of micelles against A549 cells are measured and evaluated in vitro by flow cytometry, confocal scanning laser microscopy (CLSM) and MTT assay, respectively. The results reveal that PEG-b-PTPPDS-b-PEG micelles can effectively enhance the cellular uptake and cellular internalization of porphyrin and have an extremely low dark toxicity with efficient PDT towards A549 cells. This intracellular responsive nanoparticle provides a potential strategy for anticancer therapeutic application.
关键词： amphiphilic polymer,polymeric nanoparticles,porphyrin,photodynamic therapy,reduction-sensitive
更新于2025-09-09 09:28:46
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Comparative Study of Tissue Distribution of Chlorin e6 Complexes with Amphiphilic Polymers in Mice with Cervical Carcinoma
摘要： Many photosensitizers, including chlorins, are highly hydrophobic, which makes intravenous administration problematic and affects their delivery to the tumor and uptake in the cells. Moreover, self-aggregation of the photosensitizer in aqueous solution reduces fluorescence quantum yield, triplet state, and singlet oxygen generation, and consequently diminishes photosensitizing activity. To address these issues, it was proposed to use biocompatible water-soluble polymers. However, animal studies of the photosensitizer-polymer systems are still very limited. In this work, polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), and pluronic F108 were used for dissolution of chlorin e6 (Ce6). Dynamics of accumulation of the formulations in a mouse cervical carcinoma and clearance from normal tissue, drug plasma concentrations and tissue distribution after intravenous injection were investigated. Ce6 alone and clinically used photosensitizer Photoditazine served as a control. The results showed that none of the polymers significantly changed fluorescence kinetics in the tumor. Concentration of the Ce6 formulated with polymers in the tumor tissue was comparable with Photoditazine, but uptake in the skin was less. At the same time, tumor-to-skin ratios of the Ce6-polymer complexes were similar to free Ce6. We concluded that the use of the polymeric formulation is reasonable for fluorescence diagnosis and PDT of cancer.
关键词： Chemical extraction,Amphiphilic polymer,Mouse cervical carcinoma,Photosensitizer,Chlorin e6,PDT,Fluorescence imaging in vivo
更新于2025-09-09 09:28:46