EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Zengfang Huang,Chaoyue Zhou,Xiaotong Zhang,Haoyu Xue,Wenxi Liao,Liucheng Mao,Jinying Yuan,Lei Tao,Yen Wei
Organic fluorescence dyes with long wavelength emission are attracting people’s interests in bioimaging, cells tracing and medical diagnosis due to their many advantages. This contribution exhibited a novel red fluorescent monomer BDPPA with traditional tetraphenylethylene (TPE) and phenothiazine (PHT) as structural units, which showed aggregation-induced emission enhancement (AEE) effects together with the twisted intramolecular charges transfer (TICT) owing to its D-A-D’ structure. The maximal emission wavelength of BDPPA located at 592 nm with a shoulder peak at 629 nm. Afterwards, the amphiphilic PEG-BD copolymers was acquired by RAFT polymerization of BDPPA and PEGMA. When the feeding ratio of BDPPA increased from 10.0 % to 20.0 %, the ratio of BDPPA in PEG-BD copolymers correspondingly increased from 9.6 % to 20.9 %. The obtained amphiphilic PEG-BD could self-assemble into fluorescence organic nanoparticles (FONs) with about 150 nm diameter in H 2 O solution. Owing to their TICT effect and D-A-D’ structure, both BDPPA and PEG-BD copolymers showed obvious fluorescence in THF solvent, and their intensity firstly decreased and then grew with the increase of water concentration, indicative of the obvious aggregation-induced emission enhancement (AEE). From the calculations of energy quantum, the difference ΔE of BDPPA decreased to 3.09 eV from 3.53 eV of its substrate PHT, which was very favourable for the long wavelength emission and cell imaging. Moreover, due to the long wavelength emission, excellent water solubility and biocompatibility, and AEE effect, the obtained PEG-BD FONs revealed the promising application in biological imaging field.
研究领域:
材料科学
·
生物医学工程
·
化学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Kun Wang,Hao Lu,BeiBei Liu,Jiping Yang
Polyurethanes STMPU and HTMPU containing AIE fluorogens in the soft segments and hard segments, respectively, have been synthesized and characterized. Both two resulting polyurethane solutions exhibited an aggregation-enhanced emission (AEE) feature. Then two kinds of polyurethane films were prepared and their multi-stimuli-responsive properties were explored. Interestingly, the fluorescence emission of two polyurethane films were decreased in high temperature, and polyurethanes with different structures have different temperature-dependent fluorescent behaviors. Meanwhile, weak emission was obtained when acetone was dripped onto the two polyurethane films. Moreover, the fluorescence of the polyurethane STMPU film was greatly enhanced with the increase of tensile stress (at ε < 0.3), suggesting its potential application in multifunctional fluorescent probes.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
Australian Journal of Environmental Education
·
2014
·Vol. 29
·期 2
·221-237
·
IF 0
Debbie Bradbery
Developing an understanding of the importance of a sustainable future is vital in helping children to become ‘global citizens’. Global citizens are those willing to take responsibility for their own actions, respect and value diversity and see themselves as contributors to a more peaceful and sustainable world. Children's literature — picture and story books in particular — can be used as a powerful tool to help even the youngest citizens become aware of the need to assume responsibility for creating and enjoying a sustainable future through global citizenship. Children's literature can be utilised to help children examine and change personal lifestyles to secure a sustainable future; to identify, investigate, evaluate and undertake appropriate action to maintain, protect and enhance local and global environments; to challenge preconceived ideas, accept change and acknowledge uncertainty and to work cooperatively and in partnerships with others. This article explores and examines ways in which some examples of Australasian children's literature, specifically Storm Boy (Thiele, 1963), Lester and Clyde (Reece, 1991), The Waterhole (Base, 2001), Window (Baker, 1991) and Belonging (Baker, 2004), have been used in a literacy focused preservice teacher education course to assist preservice teachers entering their internship school placements to develop children's understandings of an ecologically sustainable future. It provides further insight into methods for embedding teaching for a sustainable future into pre-service teacher education.
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DOI
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 11
·1431-1440
·
IF 3.603
Huang Zeng-Fang,Chen Ya-Li,Zhou Chao-Yue,Li Yan-Hong,Li Mei,Liu Xiao-Bo,Mao Liu-Cheng,Yuan Jin-Ying,Tao Lei,Wei Yen
In consideration of various advantages such as less harm, higher sensitivity, and deeper imaging depth, etc. , AIE materials with longwave emission are attracting extensive attention in the fields of vascular visualization, organelle imaging, cells tracker, forensic detection, bioprobe and chemosensor, etc. In this work, a novel fluorescent ( R )-PVHMA monomer with chirality and aggregation-induced emission enhancement (AEE) characteristics was acquired through enzymatic transesterification reaction basing on phenothiazine, and its [ α ]
25°C D
value was about −6.39° with a 3.08 eV bandgap calculated by the quantum calculations. Afterwards, a series of PEG-PVH1 and PEG-PVH2 copolymers with chirality feature were achieved through RAFT polymerization of the obtained ( R )-PVHMA and PEGMA with various feed ratios. When the feed molar ratio of ( R )-PVHMA increased from 21.5% to 29.6%, its actual molar fractions in the PEG-PVH1 and PEG-PVH2 copolymers accordingly increased from 18.1% to 25.7%. The molecular weight of PEG-PVH1 was about 2.2×10 4 with a narrow PDI, and their kinetics estimation showed a first-order quasilinear procedure. In aqueous solution, the amphiphilic copolymers PEG-PVH could self-assemble into about 100 nm nanoparticles. In a 90% water solution of H 2 O and THF mixture, the fluorescence intensity had the maximum value, and the emission wavelength presented at 580 and 630 nm. The investigation of cytotoxicity and cells uptake showed that PEG-PVH FONs performed outstanding biocompatibility and excellent cells absorption effects, which have great potential in bioimaging application.
研究领域:
材料科学
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高分子化学
·
荧光成像
·
纳米技术
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生物医学工程
·
有机合成
·
生物成像
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DOI
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 30
·4995-5002
·
IF 4.776
Fei Qu,Lingyun Zhao,Wenli Han,Jinmao You
Glutathione–Au nanoclusters (GSH–AuNCs) are known as typical luminophores with aggregation-induced emission (AIE) features, which can be triggered by low temperature, low pH values, and metal ions. However, these strict “triggers” restrict the application of this AIE probe under mild and neutral conditions. In this work, fluorescent amino-modified silicon nanoparticles (SiNPs) and GSH–AuNCs can self-assemble into well-designed nanospheres through electrostatic interactions under physiological conditions. The hybrid probe of SiNPs@GSH–AuNCs exhibits dual emissions located at 450 nm from SiNPs and 570 nm originating from the aggregation enhanced emission (AEE) of GSH–AuNCs. Interestingly, the addition of Zn2+ or Cd2+ can connect the nanospheres to form large aggregates, so a unique second increase of AEE from GSH–AuNCs appears, while the emission of SiNPs remains constant to act as an internal reference. The fluorescence ratios (I570/I450) of SiNPs@GSH–AuNCs are positively correlated with Zn2+ or Cd2+ with the linear range from 1.5 μM to 500 μM. Most importantly, besides the advantages of dual emissions, high fluorescence brightness, and good stability, the SiNPs@GSH–AuNCs also exhibit excellent biocompatibility and low cytotoxicity, and have been successfully applied in zinc imaging in live cells. Furthermore, the proposed method is also used to measure Zn2+ and Cd2+ in real samples with satisfactory recoveries.
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）