INTERNATIONAL JOURNAL OF THERMOPHYSICS
·
2014
·Vol. 35
·期 8
·1450-1464
·
IF 0.623
Wang Sheng,Zhang Ying,He Mao-Gang,Zheng Xiong,Chen Li-Bin
Transport and thermodynamic properties of pentane are necessary for the design and verification of reactors in pentane isomerization and degradation processes. However, there are few experimental data of these properties, especially in the high-temperature region. In this work, the thermal diffusivity and the sound speed of pentane have measured by dynamic light scattering and Brillouin light scattering, respectively. Pentane has been investigated under saturated conditions over a wide temperature range, from about 300 K up to the liquid–vapor critical point. It is estimated that: the standard uncertainty of temperature is \(u(T) = 0.01\) K for the hydrodynamic region and \(u(T) = 0.026\) K for the critical region; the relative expanded uncertainty in the thermal diffusivity is \(U_\mathrm{r}(a) = 0.03\) and the relative expanded uncertainty in the speed of sound is \(U_\mathrm{r}(c_\mathrm{s}) = 0.005\) with a coverage factor of \(k = 2\) . The thermal diffusivity and the sound-speed experimental data are also represented as functions of temperature. Finally, the results are discussed in detail in comparison with literature results and various prediction methods.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Fang Zhang,Jiaman Liang,Yang Liu,Qiuju Zhou,Yushuang Hong,Xianping Chen,Kejun Tan
Perfluorooctanoic acid (PFOA) and Perfluorooctane sulfonate (PFOS) are two typical perfluorinated compounds (PFCs) that poss potential ecological toxicity . In this work, a fluorescence and resonance light scattering (RLS) dual-readout strategy for the detection of PFCs at picomole level based on the water-soluble CdTe quantum dots (CdTe QDs) has been proposed. It is found that the CdTe QDs exhibit a quenching in the presence of PFCs and thus serve as useful probes for PFCs. The linear ranges are 0.032 – 10.0 nM with a limit of detection(LOD) of 32.02 pM for PFOA and 0.044 – 15.0 nM with a LOD of 43.96 pM for PFOS, respectively. Meanwhile, PFCs can form complexes with CdTe QDs in acid medium , resulting in remarkable RLS signals. The enhanced RLS intensities are in proportion to the concentrations of PFOA and PFOS, respectively. And the linear ranges are 0.048 – 5.0 nM with a LOD of 47.78 pM for PFOA, and 0.057 – 5.0 nM with a LOD of 56.72 pM for PFOS, respectively. This dual-mode detection increases the reliability of the measurement. The proposed method is simple, sensitive and cost-effective, with potential applications in environmental monitoring and assessment.
研究领域:
环境科学
·
分析化学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 38
·5611-5617
·
IF 1.9
Guoliang Liu,Chenglei Xuan,Da-Qian Feng,Dongliang Hua,Tianhao Liu,Gang Qi,Wei Wang
A facile fluorometric and light-scattering dual-modal nanosensor for silver(I) ions detection was established based on target-responsive aggregation of carbon dots/cysteine system. The synthesized water-soluble fluorescent carbon dots (CDs) by the one-pot hydrothermal method exhibited emissions peak at 441 nm under excitation at 352 nm. CDs fluorescence was quenched by Ag+via electron transfer, while the light-scattering intensity of CDs was significantly enhanced, providing a dual-modal means of analyte Ag+ detection. The relative fluorescence intensity is directly proportional to the concentration of Ag+ between 0.1 μM and 265 μM, and the detection limit is 50 nM. Moreover, the relative light-scattering intensity is proportional to the concentration of Ag+ from 10 to 4000 nM with the detection limit 2 nM. Common compounds including different types of metal ions had no significant interference in the detection mode. The new nanosensor was simple, rapid and sensitive and was applied to the detection of Ag+ in real water samples with satisfactory results. Moreover, the present CDs-based dual-modal sensor provided a promising platform for environmental sensing applications.
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 3
·334
·
IF 2.67
Jingyun Hu,Xinping Zhang
We report dependence of random lasing performance of directly spin-coated multicrystalline thin films of an organic–inorganic hybrid, halide perovskite CH3NH3PbBr3(MAPbBr3), on different substrates. It was discovered that random lasing performance is strongly dependent on the surface energy properties of the substrate, which determine the morphology and crystallization properties of the spin-coated film, and will consequently determine its optical scattering and emission properties. Using indium–tin oxide (ITO)-coated glass, fused silica, and tricyclo[5.2.1.02,6] decanedimethanol diacrylate (ADCP)-coated fused silica as the substrate materials, we compared the spectroscopic response of the random lasers and thus justified the photophysical mechanisms involved. The modification of the surface properties of the substrate enables controlling of the MAPbBr3crystallization and leads to the changing of the random lasing properties. The discoveries herein are also important for the construction of other types of laser devices, where the substrate effects should be considered during the design and preparation of the micro-/nano structures.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2015
·
IF 0
Shu Lin Guan,Na Fan,Qi Zhong,Ji Ping Wang
Thermo-responsive microgels with core-shell structure were prepared by free radical emulsion polymerization. The core of microgels was consisted of poly (N-isopropyl acrylamide) (PNIPAM), while the shell was consisted of poly (ethylene glycol) methyl ether methacrylate (POEGMA300). In order to compare the transition behavior of the core-shell microgels with the microgels consisted of one thermo-responsive microgel, PNIPAM and POEGMA300 microgels were prepared. PNIPAM exhibits a lower critical solution temperature (LCST) of 32 °C, and the LCST of POEGMA300 is approximately 63 °C. The thermo-responsive microgel behavior was measured by dynamic light scattering (DLS). It is observed that both of PNIPAM and POEGMA300 microgels show a thermo-responsive ability. The particle size significantly drops when the temperature passes LCST. Moreover the particle size of the thermo-responsive microgels with core (PNIPAM)-shell (POEGMA300) structure shows a linear transition behavior when the temperature is between 50 °C and 70 °C.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
Analytical Methods
·
2018
·Vol. 10
·期 40
·4951-4957
·
IF 2.073
Zhi Yuan Mao,Lu Ning Zhu,Jie Gao,Jia Jun Liu,Yin Hui Wei,Xin Yu Li,Bin Cheng Yin,Jian Wang
As a major metabolic product of purine nucleotides, uric acid (UA) usually presents in urine and serum, which is closely related to human health. With the catalysis by uricase, uric acid can yield allantoin, CO2 and H2O2. Then, the produced H2O2 is able to decompose CoOOH nanoflakes into Co2+, resulting in a smaller size with weakened light scattering. This work provides a simple and selective light scattering method for UA analysis with a linear range from 1.0 × 10−5 to 1.0 × 10−3 M and a detection limit of 1.0 × 10−6 M. In addition, this method has been successfully applied to the determination of UA in human serum samples with similar results to clinical methods.
研究领域:
分析化学
·
医学诊断
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 20
·16752-16757
·
IF 3.201
Yanming Miao,Xiaojie Sun,Qi Yang,Guiqin Yan
A majority of traditional array sensors combine several sensing units, which can hardly be miniaturized. In order to solve the deficiency, it is suggested to design a sensing unit, which can obtain multidimensional information. Herein, taking the three-dimensional (3D) optical properties including phosphorescence (Ph), fluorescence (FL) and resonance light scattering (RLS) of the Mn–ZnS quantum dots (QDs) as signals, single-unit 3-signal mucopolysaccharide (MPS) sensors on the basis of Mn–ZnS QD/poly(diallyldimethylammonium chloride) (PDC) nanohybrids (Mn–ZnS+ QDs) were built with positively-charged poly(diallyldimethylammonium chloride) (PDC) as a receptor. These 3D sensors took advantage of the static interactional difference between Mn–ZnS+ QDs and different mucopolysaccharides (MPSs), and utilized different responses of Ph, FL and RLS to differentiate and identify four MPSs including heparan sulfate (Hep), hyaluronic acid (Hya), dermatan sulfate (Der) and chondroitin sulfate (Cho). Since the static interactional difference can be discriminated in virtue of the linear discriminating analysis, single-unit 3D sensors were constructed for differentiating MPSs of different types and concentrations. The three-dimensional sensor can still identify and analyze the target mucopolysaccharide in the presence of biological sample matrix, showing its good application prospects.
研究领域:
生物化学
·
分析化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Jinmei Song,Yuhong He,Haijing Hu,Mingbian Li,Chenglong Li,Bai Yang,Haotong Wei
Computed tomography (CT) imaging has emerge as an effective medical diagnostic technique due to its rapid and 3D imaging capabilities, often employing indirect imaging methods through scintillator materials. Arraying scintillators that can confine light scattering to enable high-resolution CT imaging remains an area of ongoing exploration for emerging perovskite scintillators. Here an anti-scattering cesium lead bromide (CsPbBr 3 ) scintillator array embedded within a polyurethane acrylate matrix for CT imaging using a cost-effective solution-processed method is reported. Due to the large refractive index contrast between the scintillator and matrix, photon propagation can be well confined within the CsPbBr 3 scintillator array to significantly suppress the light scattering and enhance the light collection efficiency by nearly two times compared to the monolithic film. Furthermore, the scintillator array exhibits low-dosage and high-resolution CT imaging capability by reconstructing a 3D tooth image with a good spatial resolution of 20.1 lp cm −1 at a low effective dose of 0.22 mSv. This work highlights that the CsPbBr 3 scintillator array is a highly promising candidate for CT imaging.
研究领域:
医学影像
·
材料科学
·
放射学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Junwei Cui,Shengshan Bi,Andreas P. Fröba,Jiangtao Wu
The present work focus on the measurement of viscosity and interfacial tension of n -heptane ( n -C 7 H 16 ) with dissolved carbon dioxide (CO 2 ) by the surface light scattering. The method allows an absolute determination of both properties in a contactless way. The experiments were conducted in macroscopic thermodynamic equilibrium at temperatures from (298 to 473) K and saturation pressures up to 5.5 MPa. For sample preparation of binary mixtures of n -C 7 H 16 with dissolved CO 2 after its addition, the equilibration process could be checked to be completed by showing that viscosity and interfacial tension are independent on time. For reaching equilibrium, at least two hours were elapsed between the addition of CO 2 and the start of the measurement. For both viscosity and interfacial tension, typical expanded uncertainties are 3% on a confidence level of 95%. The viscosity results were correlated with an empirical equation, where the absolute average deviation (AAD) and the maximum absolute deviation (MAD) between experiments and correlation were 1.9% and 7.2%, respectively. For the viscosity, a data comparison was hindered because of the lack of literature data. For the interfacial tension, which can also be represented by an empirical correlation and good agreement with literature can be found.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2020
·
IF 7.333
Zhihao Wu,Huan Yang,Shuang Pan,Hui Liu,Xiaoli Hu
Ratiometric fluorescence has drawn extensive attention owing to its self-calibration property. However, it is difficult to obtain appropriate fluorescent materials that can be excited under one excitation and possess well-resolved signals simultaneously. In this work, with the optical properties of the fluorescence of carbon dots (CDs) and the second-order scattering (SOS) of ZIF-90 (zeolitic imidazole frameworks-90) nanoparticles, the synthesized CDs@ZIF-90 can be applied to phosphate (PO43–) ratiometric detection. The fluorescence of CDs is greatly suppressed through encapsulating CDs into ZIF-90. Nevertheless, the SOS is quite obvious due to the high scattering intensity of large size ZIF-90. The competitive coordination between PO43– and the metal node of ZIF-90 decomposes CDs@ZIF-90, leading to the restoration of fluorescence and the diminution of SOS. On the basis of the PO43–-induced ZIF-90 decomposition and CD release, a novel method for PO43– ratiometric detection is developed through the dual-signal response of the fluorescence scattering. Under the optimal condition, the method shows a linear range from 1.0 to 50.0 μmol L–1 with a detection limit of 0.23 μmol L–1. Furthermore, the probes are employed to assess PO43– in practical aqueous samples successfully. Compared with the traditional approach, which only records fluorescence signals, the method reported here provides a new strategy to design ratiometric sensors by fluorescence and scattering.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL SCIENCES
·
2016
·Vol. 32
·期 7
·757-762
·
IF 1.174
Wang Chengke,Chen Dan,Wang Qingqing,Wang Qiuxia
In this work, an aptasensor-based resonance light-scattering (RLS) method was developed for the sensitive and selective detection of acetamiprid. The ABA (acetamiprid binding aptamer)-stabilized gold nanoparticles (ABA-AuNPs) were used as a probe. Highly specific single-strand DNA (ssDNA, i.e , aptamers) that bind to acetamiprid with high affinity were employed to discriminate other pesticides, such as edifenphos, kanamycin, metribuzin et. al. The sensing approach is based on a specific interaction between acetamiprid and ABA. Aggregation of AuNPs was specifically induced by the desorption of the ABA from the surface of AuNPs, which caused the RLS signal intensity to be enhanced at 700 nm. The alteration of AuNPs’ aggregation has been successfully optimized by controlling several conditions. Under the optimal conditions, the RLS intensity changes ( I/I0 ) of AuNPs were linearly correlated with the acetamiprid concentration in the range of 0–100 nM. The detection limit is 1.2 nM (3σ). This method had also been used for acetamiprid detection in lake water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Qian Chen,Panpan Zhu,Jie Xiong,Lixia Gao,Kejun Tan
In this study, a simple, fast and cost-effective triple-channel optical assay for the determination of PFOS has been developed. The carbon quantum dots (CDs) were prepared by one-pot hydrothermal method and employed as probe for sensing PFOS. CDs react with PFOS to form ground-state complex, which brings about the intensity changes of three signals including fluorescence, UV–vis absorption and resonance light scattering (RLS). And the changes of the fluorescence and absorption signals can be used for the visual detection of PFOS. And there is a certain relationship between the three-signal changes with the concentration of PFOS, respectively. The proposed assay exhibits good selectivity and sensitivity with a limit of detection (LOD) of 18.27 nmol/L in the fluorescence signal. Fluorescence lifetime , transmission electron microscopy (TEM) images, Fourier transform infrared (FTIR) and zeta potential were investigated for the mechanism study. Furthermore, this promising approach was also successfully applied to PFOS sensing in real water samples with RSD ≤ 2.09%.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）