Photopolymerization of UV Curable Coatings Monitored by Raman Spectroscopy

Fengguo Liu,Ying Wang,Xiangxin Xue,He Yang 한국고분자학회 2016 폴리머 Vol.40 No.3

Photopolymerization process of UV curable coatings based on epoxy acrylate/tripropylene glycol diacrylate was monitored by Raman spectroscopy. The consumption of C=C double bond in coatings was observed under UV irradiation. Quantitative analysis of curing degree versus UV irradiation time was investigated by fitting Raman spectra. The results indicated that the initiation efficiency of cleavage type photoinitiators and Irgacure 184 are superior to that of hydrogen-abstraction type photoinitiator. High photoinitiator concentration is beneficial for achieving fast photopolymerization rate and high final conversion. However, when the concentration of photoinitiator exceeds a certain value, the polymerization rate and final conversion will not increase evidently because of initiation efficiency and free volume effect.

Surface-Enhanced Raman Scattering (SERS) Active Gold Nanoparticles Decorated on a Porous Polymer Filter

Chen, Lei,Yan, Huiying,Xue, Xiangxin,Jiang, Dayu,Cai, Yuxi,Liang, Dongmei,Jung, Young Mee,Han, Xiao Xia,Zhao, Bing SAGE Publications 2017 APPLIED SPECTROSCOPY Vol.71 No.7

<P>In this work, we designed a process to assemble gold nanoparticles onto a three-dimensional (3D) polymer surface, which can then be monitored using surface-enhanced Raman scattering (SERS). This work is the first demonstration of the assembly of gold nanoparticles on a filter film and in situ measurement with Raman spectroscopy. Herein, a polyhexamethylene adipamide (Nylon66) film embedded in the organic filter film was used as a template to fabricate a tunable SERS-active substrate. A 'hotspot''-rich gold-nanoparticle-decorated polymer substrate for SERS was prepared; this substrate exhibited high sensitivity in trace detection of targets. The study was conducted using 4-mercaptobenzoic acid as a probe molecule with the aim of comparing the scattering efficiency and the homogeneity of the Raman signal on selected substrates. In addition, we used the gold-decorated polymer film to detect a biotin-avidin complex. The most powerful advantage of the proposed microanalytical device is the in situ SERS application. The 3D nanoporous structures described in this work hold strong potential for use in various applications such as environmental monitoring and biomolecule detection.</P>

Two-dimensional inhibitors and their anticorrosion properties in sol-gel coating on aluminum alloy

Mei Yu,Bing Xue,Jianhua Liu,Songmei Li,Liangliang Xiong,Xiangxin Kong 한국표면공학회 2017 한국표면공학회 학술발표회 초록집 Vol.2017 No.11

SERS study of surface plasmon resonance induced carrier movement in Au@Cu₂O core-shell nanoparticles

Chen, Lei,Zhang, Fan,Deng, Xin-Yu,Xue, Xiangxin,Wang, Li,Sun, Yantao,Feng, Jing-Dong,Zhang, Yongjun,Wang, Yaxin,Jung, Young Mee Elsevier 2018 Spectrochimica acta. Part A, Molecular and biomole Vol.189 No.-

<P><B>Abstract</B></P> <P>A plasmon induced carrier movement enhanced mechanism of surface-enhanced Raman scattering (SERS) was investigated using a charge-transfer (CT) enhancement mechanism. Here, we designed a strategy to study SERS in Au@Cu<SUB>2</SUB>O nanoshell nanoparticles with different shell thicknesses. Among the plasmonically coupled nanostructures, Au spheres with Cu<SUB>2</SUB>O shells have been of special interest due to their ultrastrong electromagnetic fields and controllable carrier transfer properties, which are useful for SERS. Au@Cu<SUB>2</SUB>O nanoshell nanoparticles (NPs) with shell thicknesses of 48–56nm are synthesized that exhibit high SERS activity. This high activity originates from plasmonic-induced carrier transfer from Au@Cu<SUB>2</SUB>O to 4-mercaptobenzoic acid (MBA). The CT transition from the valence band (VB) of Cu<SUB>2</SUB>O to the second excited π-π* transition of MBA, and is of b<SUB>2</SUB> electronic symmetry, which was enhanced significantly. The Herzberg-Teller selection rules were employed to predict the observed enhanced b<SUB>2</SUB> symmetry modes. The system constructed in this study combines the long-range electromagnetic effect of Au NPs, localized surface plasmon resonance (LSPR) of the Au@Cu<SUB>2</SUB>O nanoshell, and the CT contribution to assist in understanding the SERS mechanism based on LSPR-induced carrier movement in metal/semiconductor nanocomposites.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We designed a shell-dependent Au@Cu<SUB>2</SUB>O nanoshell for SERS study. </LI> <LI> SERS contribution enables us to understand the possible enhancement of hybrid nanostructures. </LI> <LI> LSPR-induced carrier movement in Au@Cu<SUB>2</SUB>O nanocomposites. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>We designed the shell-dependent Au@Cu<SUB>2</SUB>O core-shell nanoparticles (NPs) for SERS study. For the electron-hole pairs in the Cu<SUB>2</SUB>O, the plasmon induced resonant energy transfer from Au to the Cu<SUB>2</SUB>O and the direct electron transfer simultaneously which can be observed from the SERS intensity.</P> <P>[DISPLAY OMISSION]</P>

Gamma ray attenuation behaviors and mechanism of boron rich slag/epoxy resin shielding composites

Mengge Dong,Suying Zhou,He Yang,Xiangxin Xue Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7

Excellent thermal neutron absorption performance of boron expands the potential use of boron rich slag to prepare epoxy resin matrix nuclear shielding composites. However, shielding attenuation behaviors and mechanism of the composites against gamma rays are unclear. Based on the radiation protection theory, Phy-X/PSD, XCOM, and ⁶⁰Co gamma ray source were integrated to obtain the shielding parameters of boron rich slag/epoxy resin composites at 0.015-15 MeV, which include mass attenuation coefficient (µ_t), linear attenuation coefficient (µ), half value thickness layer (HVL), electron density (N_eff), effective atomic number (Z_eff), exposure buildup factor (EBF) and exposure absorption buildup factor (EABF).µ_t, µ, HVL, N_eff, Z_eff, EBF and EABF are 0.02-7 cm²/g, 0.04-17 cm^-1, 0.045-20 cm, 5-14, 3 × 10²³-8 × 10²³ electron/g, 0-2000, and 0-3500. Shielding performance is BS4, BS3, BS3, BS1 in descending order, but worse than ordinary concrete. µ and HVL of BS1-BS4 for ⁶⁰Co gamma ray is 0.095-0.110 cm^-1 and 6.3-7.2 cm. Shielding mechanism is main interactions for attenuation gamma ray by BS1-BS4 are elements with higher content or higher atomic number via Photoelectric Absorption at low energy range, and elements with higher content via Compton Scattering and Pair Production in Nuclear Field at middle and higher energy range.

Comprehensive evaluation of high-temperature sintering behavior of sea sand vanadia-titania magnetite based on grey relational analysis

Zhen-xing Xing,Zhuang Huang,Gong-jin Cheng,He Yang,Xiangxin Xue,Guo-dong Zhang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12

Sea sand vanadia-titania magnetite is difficult to pelletize, and it is difficult for iron and steel enterprises touse it as a raw material for ironmaking. In this paper, the high-temperature physicochemical characteristics and sinteringbehavior of sea sand vanadia-titania magnetite were comprehensively studied and systematically evaluated. Thehigh-temperature metallurgical physicochemical characteristics of different iron ore powders and under different experimentalconditions were studied by the micro-sintering experimental system. The high-temperature sintering indexeswere comprehensively evaluated by the grey correlation analysis, and the influence of sea sand ore on sintering performancewas investigated by sintering pot experiment. The research results show that the high-temperature sinteringcharacteristics of sea sand vanadia-titania magnetite were the worst, and the grey correlation degree was the lowest. The high-temperature sintering characteristics of sintered blocks with sea sand ore were affected by changing the basicityand the addition amount of sea sand ore. When the basicity was 0.8 and the addition amount of sea sand ore was15 wt%, the evaluation index of grey relational analysis was the best. The vertical sintering speed and tumble indexwere slightly reduced by adding sea sand ore, but the sinter yield was improved and the particle size distribution of sinterwas optimized. The experimental results provide a certain data reference for the actual production of sinter with seasand vanadia-titania magnetite.

Efficient extraction and separation of vanadium and chromium in high chromium vanadium slag by sodium salt roasting-(NH4)2SO4 leaching

Jing Wen,Tao Jiang,Yingzhe Xu,Jing Cao,Xiangxin Xue 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-

A novelty process based on sodium salt roasting-(NH4)2SO4 leaching was proposed to extract vanadiumand chromium in high chromium vanadium slag (HCVS). V2O5 and Cr2O3 was then prepared. The effectsof roasting and leaching conditions on vanadium and chromium extraction behavior were studiedsystematically and completely. Vanadium precipitation conditions and chromium reduction conditionswere optimized further. 94.6% vanadium and 96.5% chromium were extracted when HCVS and Na2CO3were mixed in the molar ratio of n(Na2CO3)/n(V2O3 + Cr2O3) of 2.5, then leached in 30 g/L (NH4)2SO4solution. 94.8% vanadium was precipitated as ammonium polyvanadate (APV) just by adjusting theleaching liquid pH at 4.5, almost all chromium was remained in liquid, achieving the efficient separationof vanadium and chromium. Chromium was then recovered by reduction and precipitation. More than99% chromium was reduced when Na2S2O5 was added in m(Na2S2O5)/m[Cr(VI)] above 3. By roasting thedeposits of vanadium and chromium respectively, 91.49% V2O5 and 89.89% Cr2O3 were obtained. Thesupernatant after vanadium and chromium extraction containing NH4+ could be recycled as the newleaching medium with some new (NH4)2SO4 added, which greatly reduced the discharge of ammonianitrogenwastewater and made the whole process more environmentally friendly.

Preparation of Silver Nanocap Arrays and Their Surface-enhanced Raman Scattering Activity

Chunxu Wang,Duo Xu,Yuhai Wang,Li Wang,Lei Chen,Xiangxin Xue,Zhengkun Qin 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.10

In this article, a surface-enhanced Raman scattering (SERS) substrate of silver nanocap arrays was reported. With increasing the size of nanocaps, the localized surface plasmon resonance (LSPR) of the arrays exhibited tunable ability in the visible spectral region. The optical response of the nanocap arrays stimulated their use in SERS experiments. The assessment of SERS activity of the nanocap arrays was performed by using the 514.5 nm excitation line, and different average enhancement factor (EF) values were obtained. The good tunability of LSPR, relatively high average EF values and long-range order of these substrates suggest that the silver nanocap arrays have promising applications as functional components in spectroscopy, immunoassay, biosensors, and biochips.