INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Jianjun Du,Zhenkuan Wang,Xiaojun Peng,Jiangli Fan
A simple, fast, and convenient colorimetric sensing system is presented for melamine recognition in milk samples by thymine-derivative- (NT-) decorated gold nanoparticles (AuNPs), based on the complementary hydrogen bond between thymine and melamine, wherein the introduction of melamine causes a rapid and obvious red-to-blue color change. Therefore, the melamine content in milk can be qualitatively recognized by the naked eye and quantitatively measured by measuring absorbance. NT-AuNPs show excellent selectivity to melamine against any other tested molecules, anions, and metal ions, as well as very good sensitivity that can distinguish melamine-contaminated milk from safe milk with a limit of detection of 3.5 nM.
研究领域:
分析化学
·
食品科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2016
·
IF 3.782
Changkun Liu,Xiaoyan Liang,Ji’an Liu,Xiaobin Lei,Xinzhen Zhao
In this study, a porphyrin functionalized cotton fiber was prepared and investigated for the visual detection and efficient adsorption of cadmium (Cd 2+ ) ions in aqueous solutions. The pristine cotton fiber was first grafted with poly (3-sulfopropyl methacrylate potassium salt) (PSMP) via the surface-initiated atom transfer radical polymerization (SI-ATRP), and subsequently immobilized with 5,10,15,20-tetrakis(1-methy-4-pyridinio)porphyrin tetra(p-toluenesulfonate) (TMPyP), to form the CPT (Cotton-PSMP-TMPyP) material. The CPT was characterized by SEM, FTIR, XPS and elemental analysis, and examined for the detection and adsorption of cadmium ions. The influencing factors such as pH and the initial cadmium ion concentrations on the adsorption performances were investigated. Results showed that the cadmium ion adsorption isotherm was best fitted with the Langmuir isotherm model, with the derived maximum adsorption capacity of 0.8638 mmol/g. The thermodynamic study showed the endothermic nature of the adsorption process. In addition, the adsorption kinetics was fast with over 90% of the total cadmium ions adsorbed within 2 min. Furthermore, the distinctive color response of the CPT to the cadmium ions in aqueous solutions was clearly displayed. A linear relationship between the light absorbance of CPT-Cd (CPT adsorbed with cadmium ions) and the initial concentrations of cadmium ions was successfully established, which could be used for the fast determination of the cadmium ion concentrations in aqueous solutions.
研究领域:
环境科学
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材料科学
·
化学
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 7
·1413
·
IF 4.967
Yang Yang,Ziyuan Zheng,Jun Lin,Lintao Zhou,Guohua Chen
Polarizer is a key component of the liquid crystal display panel, and the optical properties mainly include transmittance, degree of polarization and chromaticity. Polarizer is made of a multilayer optical film, in which the PVA polarizing film is the core structure for realizing the polarization of the whole polarizer. PVA polarizing film is commonly manufactured through a multi-step craft, including rinsing, dyeing, stretching and correcting. The correction process has a significant impact on the final apparent color and optical properties of the polarizer. In this study, the KI concentration in the correcting tank, ranging from 1% to 3%, was systematically investigated. With the increase in KI concentration, the Raman vibration peak at 160 cm−1representingI5−ions gradually weakened, while the Raman vibration peak at 110 cm−1representingI3−ions gradually increased, indicating that the KI in the correcting tank changed the chemical equilibrium of polyiodide ions in PVA. Then abundant chromophoreI5−ions were consumed andI3−ions generated, so that the apparent color of PVA polarizing film gradually changed from dark blue to dark gray, and the chromaticitya-value andb-value gradually increased. The change in the concentration of dichroic species (I5−andI3−) in PVA polarizing film had directly affected its transmittance in the visible range. From the UV-Vis transmittance spectrum of PVA polarizing film, when theI5−ions were consumed andI3−ions generated, the transmittance of PVA polarizing film in the region of 675–525 nm wavelength increased gradually while the polarization degree also increased.Keywords:PVA polarizing film;correction process;transmittance;chromaticity;degree of polarization
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Advances
·
2024
·
IF 5.2
Wasim Ullah Khan,Waheed Ullah Khan,Haris Zaman,Ayaz Mahsud,Dilfaraz Khan,Salim Ullah Khan,Shuakat Khan,Yueli Zhang
Correlated color temperature (CCT) is widely used to describe the chromaticity of white light sources, although chromaticity is only two-dimensional, and the distance from the Planckian locus is typically absent. Herein, a novel single-phase Ca3YAl3B4O15:Tm3+,Dy3+,Eu3+, an emerging white-emitting phosphor with good optical properties and thermal-stability, is produced, and the practical calculation methods to calculate the chromaticity-shift (ΔE) and Duv value for color-quality are also demonstrated, making it a good contender for possible use in LEDs. The incorporation of Eu3+ into Ca3YAl3B4O15:0.015Tm3+,0.08Dy3+ resulted in attractive warm-white light with CCT declining from 4635 K to 3065 K. The Ca3YAl3B4O15:Tm3+,Dy3+,Eu3+ exhibited excellent thermal stability (I@400 K = ∼93%). The Ca3YAl3B4O15:Tm3+,Dy3+,Eu3+-based WLED exhibits satisfactory parameters of high Ra (89.9) and low-CCT (3065 K). Additionally, this article offers useful mathematical strategies for calculating Duv over a wide-range of chromaticity, from 2000 to 6000 K in CCT and from −0.002 to 0.014, which strongly matches the range in an American National Standards Institute (ANSI) standard. For the first time, white light with minimized thermal-quenching, improved CRI, and color quality has been used in near-UV chip-excited WLEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Renjie Jiang,Jie Chen,Mingqin Li,Yanna Tian,Shiji Shen,Xuan Yang,Yanru Tang,Yan Sun,Hui Lin,Shengming Zhou
Ce: YAG- Al 2 O 3 composite ceramics are regarded as highly promising materials for laser illumination application due to their high luminous efficacy and thermal stability. Nevertheless, the Ce: YAG ceramics exhibit limited color rendering index (CRI) for indoor lighting due to their low red emission component. In this study, we synthesized high-performance Ce, Mn-doped (Y, Tb) 3 Al 5 O 12 –Al 2 O 3 composite ceramic phosphors via a vacuum solid-state sintering method. It was observed that the introduction of Mn 2+ ions created a second luminescence center with an emission peak centered at 580 nm. As the Mn 2+ concentration increased, the emission peak redshifted from 580 nm to 591 nm, leading to a significant enhancement in the color rendering index of the ceramics. The cross-energy transfer between Tb 3+ and Mn 2+ , Ce 3+ ions augmented the absorption and conversion of blue light by the ceramics, thereby reducing the correlated color temperature greatly. Based on these findings, ceramics with a Ce 3+ concentration of 3 at% and a Mn 2+ concentration of 4 at% exhibited the highest CRI values (81.3 and 75.6) under both laser excitation and LED excitation, establishing them as strong candidates for achieving high color rendering in white LED/LD illumination applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 36
·1-14
·
IF 2.8
Yang Jian,Xie Chenglong,Zhao Lei
A newly synthesized orange–red-emitting phosphor, K 2 Sr(MoO 4 ) 2 :Sm 3+ , was produced for the first time through high-temperature solid-state synthesis methods. Detailed analysis was conducted on the phase purity, morphology, and luminescence properties of the synthesized phosphors. The K 2 Sr(MoO 4 ) 2 :Sm 3+ phosphors let forth orange–red light when excited at 403 nm because of the 4 G 5/2 → 6 H 9/2 transition. The optimal doping concentration of the K 2 Sr(MoO 4 ) 2 : x Sm 3+ phosphor was found to be x = 3 mol%. The chromaticity coordinates of K 2 Sr(MoO 4 ) 2 :3 mol% Sm 3+ were (0.617, 0.381) with a corresponding high color purity of 99.8%. This prepared w-LED exhibited an exceptional color rendering index (CRI) of 90, while maintaining a suitable correlated color temperature (CCT) of 5825 K and CIE color coordinates were (0.325, 0.327). Hence, K 2 Sr(MoO 4 ) 2 :Sm 3+ phosphors are desirable options for creating w-LEDs and lighting based on near-ultraviolet (NUV) chips. Their unique properties show significant potential for enhancing the performance of solid-state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaohong Li,Xiaozhen Zhang,Renhua Chen,Huafeng Liu,Leying Wang,Si Cheng,Yongzhi Yu
The internal modification with rare earth ion doping proved to be a very effective strategy for improving the luminescent properties of NaYF 4 -based upconversion materials. However, greatly enhancing the luminescence efficiency of NaYF 4 :Yb 3+ /Er 3+ remains a major challenge. Herein, the effects of Sn 4+ doping on the structure and luminescent performance of such material were explored. The hydrothermal molten-salt method was applied to synthesize the Sn 4+ -doped NaYF 4 :Yb 3+ /Er 3+ upconversion materials, and their crystal structures, morphologies, surface chemical composition and element states, and luminescence performance were characterized. It was found that Sn 4+ doping can significantly enhance the luminescence intensity and tailor the chromaticity of NaYF 4 :Yb 3+ /Er 3+ . In particular, the green (G) and red (R) luminescence intensity levels of the 30 mol% Sn 4+ doped material were increased by factors of 26.97 and 38.91, respectively. The R/G ratio was incremented from 0.34 for the undoped material to 0.83 for the 40 mol% Sn 4+ doped counterpart. The Sn 4+ doping led to the change of lattice distortion and crystal growth pattern of NaYF 4 :Yb 3+ /Er 3+ . The mechanism for Sn 4+ doping to affect the luminescence properties of the prepared upconversion material was also explored. The changes in luminescence intensity levels and R/G ratios could be attributed to the highly asymmetric distorted lattice and crystal field resulting from Sn 4+ doping.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
POLYHEDRON
·
2025
·
IF 2.6
Qian Du,Chang-Sheng Wang,Yu-Guo Yang,Wei Zhao,Xiao-Na Shen,Bing Liu,Yuan-Yuan Zhang,Hua-Di Zhang,Hua-Jian Yu,Cheng-Cheng Qiu,Xian-Shun Lv,Rui Zhang,Xu-Ping Wang
Some Tb 3+ /Eu 3+ doped SrGdGa 3 O 7 (SGGO) phosphors were fabricated, achieving multi-color tunability through the addition of a sensitizer. The experimental results indicate that the doped ions are uniformly distributed, with no impurity phases detected. In SGGO-based phosphors, Eu 3+ ions serve as activators and exhibit an optimal luminescence transition level of 5 D 0 → 7 F 4 . When Tb 3+ ions are used as the sensitizer and at a specific concentration, the luminescence color transition of green → orange → red as the content of Eu 3+ enhances. Analysis of the decay lifetime curves reveals that Tb 3+ → Eu 3+ energy transfers occur in the co-doped SGGO phosphors, with the mechanism identified as quadrupole–quadrupole interaction. This article investigates the specific energy transfer processes involved. The optimum content of Eu 3+ is ascertained as 0.03. Under the excitation at 375 nm, the SGGO based phosphor containing 0.06 Tb 3+ and 0.03 Eu 3+ exhibits CIE coordinates of (0.5000, 0.4397).
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Food Measurement and Characterization
·
2021
·Vol. 15
·期 2
·1747-1753
·
IF 2.431
Li Yi-Fang,Lin Zheng-Zhong,Hong Cheng-Yi,Huang Zhi-Yong
A facile colorimetric method for rapid detection of putrescine (Put) and cadaverine (Cad) based on the peroxidase-like activity of (Fe,Co) codoped-CDs was developed. With the enzymatic hydrolysis by diamine oxidase (EC 1.4.3.6, DAO), Biogenic amines (BAs) were decomposed to produce H 2 O 2 which oxidizes 3,3',5,5'-tetramethyl-benzidine with the catalysis of (Fe,Co)-codoped CDs. By means of principal component analysis, Put and Cad were differentiated from BAs and their total amounts were detected by measuring the spectral absorption at 652 nm with a linear range from 0.25 to 10 mg kg −1 . The colorimetric method was applied to the detection of Put and Cad in various fish samples with a detection limit ((3σ/k, n = 9)) of 0.06 mg kg −1 . Besides verifying with HPLC, the recoveries of the colorimetric method were also tested by spiking standards at three levels with the range of 98.2%–115.7%, indicating that the established colorimetric method was accurate and sensitive.
研究领域:
食品科学
·
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Xiaozhen Xiao,Chao Zhang,Lishan Chen,Liqiong Liao
For fast and visual detection of multiple metal ions , herein, a re-usable colorimetric polymeric gel with spiropyran moiety was fabricated. Under ultraviolet light, the spiropyran (SP) moiety could isomerize into the colored merocyanine (MC) isomer and chelate with divalent metal ion (M 2+ ) and form MC-M 2+ complexes. Chelated with different metal ions (Ca 2+ , Co 2+ , Zn 2+ , and Cu 2+ ions), the UV–Vis spectra of the gels could display the specific colorimetric response. When the metal-ions chelated gel was irradiated with Vis light, ions dissociated from MC and released from gel due to the MC moiety isomerized to the SP form. Furthermore, after 7 cycles of alternative UV–Vis irradiations, the gel showed excellent reversible chelation/dissociation of metal ion. The competitive tendency of metal ions to chelate with gel was as following: Cu 2+ > Co 2+ ≈ Zn 2+ > Ca 2+ , which was in accordance with the density functional theory modeling. Using ionoprinting technology, the gel could achieve repeatability simultaneous detection of multiple metal ions. The light-triggered metal ion chelation/dissociation capability of the gel could be harnessed to construct reusable onsite platform for visual, fast, easy detection of multiple metal ions.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2020
·
IF 4.142
Xiaowen Wang,Bin Mu,Jiang Xu,Aiqin Wang
High-performance bismuth yellow hybrid pigments based on SiO 2 , Al 2 O 3 and MgO were successfully fabricated by chemical precipitation followed by annealing at 700°C. Interestingly, the colors of the hybrid pigments depended on the oxide contents, and the optimal yellow value of +92.07 was obtained at an Al 2 O 3 /SiO 2 /MgO mass ratio of 1:0.375:0.750. X-ray diffraction results indicated the formation of pure monoclinic-scheelite-type BiVO 4 with high crystallinity , suggesting that the incorporated Si, Al and Mg entered the crystal lattice of BiVO 4 . Doping with these elements effectively adjusted the band gap of BiVO 4 , and thus the color of the hybrid pigments could be easily controlled using these oxides. Furthermore, the hybrid pigments also exhibited good suspension properties and chemical stability in acid and alkaline solutions, water and ethanol. Importantly, these pigments were applied in high-grade automotive top finishes and exhibited excellent color and dispersion properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2015
·
IF 1.644
Wenyan Liu,Yu Zhang,Cheng Ruan,Dan Wang,Tieqiang Zhang,Yi Feng,Wenzhu Gao,Jingzhi Yin,Yiding Wang,Alexis P. Riley,Michael Z. Hu,William W. Yu
The quantum dot-based light-emitting diodes (QD-LEDs) were fabricated using blue GaN chips and red-, yellow-, and green-emitting ZnCuInS/ZnSe/ZnS QDs. The power efficiencies were measured as 14.0 lm/W for red, 47.1 lm/W for yellow, and 62.4 lm/W for green LEDs at 2.6 V. The temperature effect of ZnCuInS/ZnSe/ZnS QDs on these LEDs was investigated using CIE chromaticity coordinates, spectral wavelength, full width at half maximum (FWHM), and power efficiency (PE). The thermal quenching induced by the increased surface temperature of the device was confirmed to be one of the important factors to decrease power efficiencies while the CIE chromaticity coordinates changed little due to the low emission temperature coefficients of 0.022, 0.050, and 0.068 nm/°C for red-, yellow-, and green-emitting ZnCuInS/ZnSe/ZnS QDs. These indicate that ZnCuInS/ZnSe/ZnS QDs are more suitable for downconversion LEDs compared to CdSe QDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）