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Figure 3. (a) Transmission and (b) fluorescence microscopy images of EuC-doped PHB replicas coated with one PAH/PSS bilayer. The insets in (a) and (b) are photographs of the particles after centrifugation in water and exposed to sunlight and ultraviolet light, respectively. The EuC incubating concentration was 0.5 mg mL -1 . After removal of the silica template, PAH/PSS-coated PHB replicas readily dispersed in water, as observed by optical microscopy (Figure 2b). The particles have a diameter of 2-4 μm, similar to the size of the MS template spheres. Figure 2c shows a TEM image of the PHB replicas. The diameter of the PHB replicas decreased to 1-2 μm and a rough particle surface was observed under high magnification conditions (insert in Figure 2c). Figure 2d shows the SEM images of the PHB replicas coated with PAH/PSS, which is a free-standing, noncollapsed sphere. The porosity on the surface is apparent at higher magnification (Figure 2d inset). This noncollapsed structure is in contrast to what is typically observed for polyelectrolyte capsules prepared via the sequential assembly of polymers on the surface of MS particles without PHB loading, where collapsed, hollow structures are observed. 20 FTIR was also used to monitor the composition of the particles. For the PHB-loaded MS particles, a strong and broad absorption band at 1065 cm -1 was observed (Figure S3). The band can be assigned to the Si-O stretching vibration. The peak at 1723 cm -1 is attributed to the C=O stretching vibration of PHB. 21 No absorption band at 1065 cm -1 was observed for the replicas, suggesting complete removal of the silica. The spectrum of the PAH/PSS-coated PHB replicas is similar to the spectrum of pure PHB. The absorption peak at 1007 cm -1 originates from the SO 3 - symmetric vibration of PSS. 22 Luminescent materials are widely employed in fields as diverse as biology and information technology. Commonly sought properties for luminescent materials are brightness and stability. 23 EuC has emerged as a novel luminescent material because of its unique spectral characteristics, including sharp emission peaks, long lifetimes, high fluorescence quantum yields, and a large Stokes shift. However, the luminescence of EuC is not stable in aqueous solution because coordination of −OH groups extensively reduces its luminescence emission intensity and decay time. Our aim was to immobilize the EuC into the PHB replicas to construct particles with stable and intense luminescence. 84
Figure 4. (a) Energy transfer model from the ligand to the Eu III luminescent center in a PHB replica doped with EuC. PHB serves as an efficient cosensitizer for the Eu III ion. (b) Luminescence emission spectra of EuC-doped PEM capsules composed of three bilayers of PAH/PSS (black line) and PHB replicas coated with one PAH/PSS bilayer (red line) dispersed in water (λ excitation = 350 nm). The EuC incubating concentration was 0.05 mg mL -1 . The EuC-doped PHB replicas coated with PAH/PSS were visualized in situ by fluorescence microcopy (Figure 3). From the images, the replicas are observed to be spherical with a diameter of 2- 4 μm, and no aggregation was observed in both transmission and fluorescence modes. The intact replicas show no shrinkage or swelling after loading EuC in ethanol, suggesting the PHB replicas have good stability in both aqueous and alcohol solutions. The bright luminescent spheres confirm the effective loading of EuC in the replicas (Figure 3b). The insets in Figure 3a and 3b show the images of the EuC-doped PHB replicas coated with PAH/PSS in water after centrifugation and exposed to sunlight and ultraviolet light, respectively. The intense monochromatic red luminescence of the EuCdoped replicas is easy to detect by a laboratory ultraviolet lamp at 365 nm (Figure 3b inset). The intense luminescence observed from the EuC-doped PHB replicas originates from the loaded EuC. Figure 4a displays an energy transfer model for the ligands, PHB, and the central rare-earth ions in the replica. Firstly, the β-diketone ligand TTA is excited by ultraviolet light. Efficient intermolecular energy transfer from the ligand to the luminescent center and subsequent highly efficient emission from the excited state of Eu III to the low level state endow the EuC-doped replicas with luminescent properties. This is the so-called “antenna effect”. 24 A detailed energy level diagram for Eu III along with the singlet and triplet levels of TTA is given in Figure S4. Here, the PHB also serves as an efficient cosensitizer for the Eu III ions. 12 85
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The 3 rd VACPS Research Workshop Pr
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Organizing Committee Victorian Asso
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Preface On the occasion of the publ
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Paper as a low-cost base material f
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Acknowledgements We gratefully ackn
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Career planning and Job Interview i
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The role of mitochondria in atrial
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Track-Before-Detect Procedures for
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3. Dynamic model for approaching ta
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(a) (b) Fig. 7. mesh plot of the re
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Definition 2 The probability of tar
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Acknowledgments Xiaobo Deng would l
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speed, several methods can be utili
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Where u ′ , v′ ) is the point p
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Page 42 and 43: Demonstration and Performance Analy
Page 45 and 46: Effect of mini-tyrosl-tRNA syntheta
Page 47 and 48: 2.1 Materials Sprague-Dauley(SD) ma
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Page 53 and 54: 3.4.The mRNA expression of mini-Tyr
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Page 57 and 58: Distribution of three forms alpha-m
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Page 65 and 66: Fig.6 (A) Mass Spectrometry results
Page 67 and 68: transcription-polymerase chain reac
Page 69 and 70: Investigation of the mechanism of t
Page 71 and 72: Dual mode roll-up effect in a multi
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Page 78 and 79: workflows. By comparing the generat
Page 80 and 81: [10] E. Deelman, G. Singh, M. Livny
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Page 107 and 108: Figure 1. Г×Re[fCM] vs. frequency
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Page 125 and 126: new tissue[10]. Most of these human
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associated with a reinvention of in
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enterprises…There obviously is no
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Union assistants participate in org
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[5] Deyo, Frederic C and Ağartan,
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Organizational Capabilities • Lea
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Table 1. Correlations, Reliabilitie
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[18]. Jap, S. D. (1999). Pie-expans
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Early Childhood Education Matters:
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decisions on selection of child car
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Noble, K. (2007). Parent choice of
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An Exploration of Country of Origin
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Supercontinuum generation for fiber
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Gas chromatographic retention indic
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Outward Foreign Direct Investment f
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Fiber Nonlinearity Precompensation
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