Recent SAXS progress at NSRRC

Jeng, U‐Ser; Hsu, Chia‐Hung; Sun, Ya-Sen; Lai, Y. H.; Chung, Wen-Tai; Sheu, Hwo‐Shuenn; Lee, H. Y.; Song, Yen‐Fang; Liang, K. S.; Lin, Tsang–Lang

doi:10.1007/bf03218488

Cited by 14 publications

(2 citation statements)

References 9 publications

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“…The internal structure of the assembly may be successfully characterized using XRD and SAXS. 38,39 As shown in the XRD results (Figure 2b), a lot of sharp peaks appeared in the range of 20−40°. Diffraction peaks at 2θ = 32.1, 34.7, and 40.5°correspond to Cu−Cu (the peak at 2.77 Å), Cu−I (the peak at 2.64 Å), and Cu−P (the peak at 2.24 Å), respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 74%

“…However, compared to the original Cu 4 –NCs, it is more stable and not fully decomposed due to the tight packing and greater copper content of the assembly. The internal structure of the assembly may be successfully characterized using XRD and SAXS. , As shown in the XRD results (Figure b), a lot of sharp peaks appeared in the range of 20–40°. Diffraction peaks at 2θ = 32.1, 34.7, and 40.5° correspond to Cu–Cu (the peak at 2.77 Å), Cu–I (the peak at 2.64 Å), and Cu–P (the peak at 2.24 Å), respectively .…”

Section: Resultsmentioning

confidence: 99%

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Solvent-Induced Self-Assembly of Copper Nanoclusters for White Light Emitting Diodes

Zhou

Zhang

et al. 2021

ACS Appl. Nano Mater.

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As a type of luminescent material, copper nanoclusters (Cu NCs) are widely concerned because of their low cost, nontoxicity, and outstanding biocompatibility. However, research studies on the preparation of hydrophobic Cu NCs with high quantum yield can be improved. In this work, we first synthesized atomically precise triphenylphosphine (PPh 3 )-capped Cu NCs (Cu 4 −NCs). Second, we adopted solvent engineering strategies to trigger the self-assembly of Cu 4 −NCs into the assembly with branched structures, thereby achieving aggregation-induced emission (AIE), thermally activated delayed fluorescence (TADF), and a high absolute quantum yield of 67.05%. Moreover, we performed structural characterization and optical analysis, which revealed that the high compactness of the assembly enhances the cuprophilic interaction and suppresses the intramolecular vibration and rotation of the Cu 4 −NCs ligand, protecting the Cu core from singlet oxygen quenching. These properties lead to the emergence of TADF and AIE. By mixing the as-assembled Cu 4 −NCs with commercial phosphors, a white light emitting diode prototype can be fabricated. This research demonstrates that TADF emission and the robust luminescence structure of the Cu 4 − NCs assembly provide them a high application value and extend the research opportunities for metal NCs in optical devices.

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Section: ■ Results and Discussionmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Solvent-Induced Self-Assembly of Copper Nanoclusters for White Light Emitting Diodes

Zhou

Zhang

et al. 2021

ACS Appl. Nano Mater.

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Effect of organosilica isomers on the interfacial interaction in polyimide/aromatic organosilica hybrids

Choi

Kim

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:We report the effect of organosilica precursor isomers on the interfacial interaction between polyimide and organosilica in polyimide/organosilica hybrid composite films. Poly(4,4 0 -oxydianiline biphenyltetracarboxamic acid) (BPDA-ODA PAA) was used as the polyimide precursor, while the organosilica was made using o-substituted, m-substituted, and p-substituted phenyl organosilica precursor isomers. For the preparation of precursor hybrid films, BPDA-ODA PAA and organosilica precursors were mixed and then the organosilica precursors were converted to corresponding organosilica via sol-gel process. Finally, these precursor films were converted to corresponding polyimide/organosilica hybrid films by the thermal imidization of BPDA-ODA PAA, which results in poly(4,4 0 -oxydianiline biphenyltetracarboximide) (BPDA-ODA PI). The polyimide/organosilica hybrid films were characterized using three distinctive nuclear magnetic resonance spectroscopies ( 1 H NMR, 13 C-CPMAS-NMR, and 29 Si-MAS-NMR), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and peel strength measurement. We found that the m-substituted phenyl organosilica shows poorer interfacial interaction with BPDA-ODA PI than do the o-or p-substituted phenyl organosilicas. It was observed, however, that the peel strength of the hybrid films against an aluminum substrate increased with increasing contents of organosilicas, regardless of the nature of the organosilica isomers.

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Small-angle x-ray scattering station 4C2 BL of pohang accelerator laboratory for advance in Korean polymer science

Yoon

Kim

et al. 2008

Macromol. Res.

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There are two beamlines (BLs), 4C1 and 4C2, at the Pohang Accelerator Laboratory that are dedicated to small angle X-ray scattering (SAXS). The 4C1 BL was constructed in early 2000 and is open to public users, including both domestic and foreign researchers. In 2003, construction of the second SAXS BL, 4C2, was complete and commissioning and user support were started. The 4C2 BL uses the same bending magnet as its light source as the 4C1 BL. The 4C1 BL uses a synthetic double multilayer monochromator, whereas the 4C2 BL uses a Si(111) double crystal monochromator for both small angle and wide angle X-ray scattering. In the 4C2 BL, the collimating mirror is positioned behind the monochromator in order to enhance the beam flux and energy resolution. A toroidal focusing mirror is positioned in front of the monochromator to increase the beam flux and eliminate higher harmonics. The 4C2 BL also contains a digital cooled charge coupled detector, which has a wide dynamic range and good sensitivity to weak scattering, thereby making it suitable for a range of SAXS and wide angle X-ray scattering experiments. The general performance of the 4C2 BL was initially tested using standard samples and further confirmed by the experience of users during three years of operation. In addition, several grazing incidence X-ray scattering measurements were carried out at the 4C2 BL.

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Recent SAXS progress at NSRRC

Cited by 14 publications

References 9 publications

Solvent-Induced Self-Assembly of Copper Nanoclusters for White Light Emitting Diodes

Solvent-Induced Self-Assembly of Copper Nanoclusters for White Light Emitting Diodes

Effect of organosilica isomers on the interfacial interaction in polyimide/aromatic organosilica hybrids

Small-angle x-ray scattering station 4C2 BL of pohang accelerator laboratory for advance in Korean polymer science

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