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101.
Siyun Liu Jinmiao Zhu Yuhua Shen Anjian Xie Chunyan Zhang Lingguang Qiu 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2007,81(7):1141-1146
A series of calcium bilirubinate nanoparticles were synthesized in microemulsions consisting of polyoxyethylene octylphenol
ether (Triton X-100), n-hexyl alcohol (n-C6H13OH), cyclohexane (c-C6H12), and an aqueous solution. The particles were characterized by Fourier transform infrared (FT-IR) spectra, powder X-ray diffraction
(XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES), transmission electron microscopy (TEM), and zeta
potential measurements. The results showed that the initial CaCl2/Na2BR molar ratio and the molar ratio of water to surfactant (ω0) influenced the morphology and microstructure of calcium bilirubinate nanoparticles and the sites of Ca2+ coordination to BR2−. The composition of synthesized calcium bilirubinate was nonstoichiometric. The stability of calcium bilirubinate nanoparticles
dispersed in water changes as the Ca2+/BR2− molar ratio and solution pH varied. Dopant Fe2+ ions played a certain role in the simulated mineralization of calcium bilirubinate. A possible mechanism of calcium bilirubinate
formation in inverse microemulsions is discussed.
The text was submitted by the authors in English. 相似文献
102.
Spectrofluorimetric Assay of Cationic Surfactants by Fluorescence Quenching of 9-Anthracenecarboxylic Acid 总被引:1,自引:0,他引:1
A new simple, selective and sensitive fluorescence quenching method was developed to determine cationic surfactants with the 9-anthracenecarboxylic acid (ACA). The fluorescence intensity of ACA was decreased by addition of trace amounts of cationic surfactants. Under optimum conditions, the ratio of fluorescence intensity in the absence and presence of cationic surfactants was proportional to the concentration of cationic surfactants over the range of 0.3–4.5 × 10−5 mol L−1 for cetylpyridinium chloride (CPC) and 0.4–6.0 × 10−5 mol L−1 for cetyl trimethyl-ammonium bromide (CTAB). The detection limits are 1.0 × 10−6 mol L−1 for CPC and 1.2 × 10−6 mol L−1 for CTAB, respectively. Based on this approach, this paper presents a new quantitative method for cationic surfactants assay. 相似文献
103.
《Electrochemistry communications》2005,7(6):597-601
A novel chitosan-carboxylated multiwall carbon nanotube modified glassy carbon electrode (MC/GCE) was developed to investigate the oxidation behavior of nitrite using cyclic voltammetry and differential pulse voltammetry modes. The electrochemical mechanism of the MC/GCE towards nitrite was discussed. The MC/GCE exhibited fast response towards nitrite with a detection limit of 1 × 10−7 mol l−1 and a linear range of 5 × 10−7–1 × 10−4 mol l−1. The possible interference from several common ions was tested. The proposed method was successfully applied in the detection of nitrite in real samples. 相似文献
104.
Painleve property of the (2+1)-dimensional multi-component Broer-Kaup (BK) system is considered by using the standard Weiss Kruskal approaches. Applying the Clarkson and Kruskal (CK) direct method to the (2+1)- dimensional multi-component BK system, some types of similarity reductions are obtained. By solving the reductions, one can get the solutions of the (2+1)-dimensional multi-component BK system. 相似文献
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108.
Different from the previous methods of obtaining optical tomography of quantum states, in this paper we use the Radon transform between the single- (two-)mode Wigner operator and the pure-state density operator |q〉 f,g f,g 〈q| (|η,τ 1,τ 2〉〈η,τ 1,τ 2|) to analytically obtain optical tomograms for single- (two-)mode squeezed chaotic fields, where the states |q〉 f,g (|η,τ 1,τ 2〉) refer to the newly introduced intermediate coordinate-momentum (entangled) states. More interestingly, we find that the tomograms of squeezed chaotic fields and those of coherent states are related by a integration. Thus, we establish a new convenient approach of obtaining tomograms for quantum states. 相似文献
109.
Chun Miao Shu-Dong Fang Ping Dong Zhuo-Liang Cao 《International Journal of Theoretical Physics》2014,53(12):4098-4106
We present a practical and general scheme of remote state preparation in the presence of the classical non-Markovian noises, where one of the quantum channels becomes a mixed state. The noises can be modelled as the so-called Ornstein-Uhlenbeck processes. This remote state preparation scheme is more practical than the pure state case in quantum information processing. The fidelity of the remote state preparation is (1 + e ?4f(t))/2 and the success probability is 1/2. 相似文献
110.
In this paper we first survey the results on the embedding flow problem of dif-feomorphisms in higher dimensional spaces. Next we present some new results on the characterization of semi-unipotent diffeomorphisms in R3, which have a formal embedding flows. 相似文献