2014/05/12 15:18
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赛智LC-10Tvp梯度高效液相色谱仪
型号: LC-10Tvp
产地: 浙江
品牌: 赛智
¥10万 - 20万
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赛智LC-10T等度高效液相色谱仪
型号: LC-10T
产地: 浙江
品牌: 赛智
¥5万 - 10万
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NanoBrook产品应用-12-ZetaPALS
文献名: Structural, morphological and optical properties of Bi NPs obtained by laser ablation and their selective detection of L-cysteine 作者: Ramon Gabriel Teixeira Rosaa, Celso de Araujo Duartea , Wido Herwig Schreinera, Ney Pereira Mattoso Filhoa, Arandi Ginane Bezerra Jr.b, Andersson Barisonc, Fernanda Maria Marins Ocamposc a Departamento de Física, Universidade Federal do Paraná Centro Politécnico, CP 19044, 81531-990 Curitiba (PR), Brazil b Departamento Acadêmico de Física, Universidade Tecnológica Federal do Paraná, 80230-901 Curitiba (PR), Brazil c Departamento de Química, Universidade Federal do Paraná Centro Politécnico, CP 19081, 81531-990 Curitiba (PR), Brazil 摘要:In the present work we show the results of the investigation of the properties of bismuth nanoparticles (NPs) obtained by the laser ablation in water. The samples were characterized by various techniques: UV/vis spectroscopy, dynamic light scattering, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, nuclear magnetic resonance and zeta potential. The NPs were metallic and surface oxidated, exhibiting absorption peak at 257 nm due to the surface plasmon resonance. The interaction between the NPs and various amino acids was studied and revealed a selective sensibility to cysteine on a range of concentration from 80 to 720 μM, which we attribute to a dimerization of cysteine to cystine probably complexed to the nanoparticle surface by electrostatic interactions, leading to the modification of the NP absorption spectrum. 关键词:Bismuth; Nanoparticles; Laser ablation; Cysteine
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从中药中提取分离化合物,第一步需要将中药材中的成分用有机溶剂提取出来,包括常规的有机溶剂浸泡,超声提取,超临界提取和加速溶剂萃取(Aseeker-600型加速溶剂萃取仪)等,得到一份总提物。
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导致超纯水机性能下降的因素有哪些?
超纯水机在后期使用中会因各种因素导致设备性能下降,所以为了确保延长设备的使用寿命,日常使用时就应该注意设备的维护和保养,那么导致超纯水机性能下降的因素有哪些呢?
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