基础有机原料检测

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氟苯中振动斯塔克光谱快速测量检测方案(红外光谱仪)

振动斯塔克光谱(VSS)是一种直接测量凝聚态物相VSE的实验方法,它可以定量给出振动模式对外部电场的敏感性,并用斯塔克调谐率来表示,单位是cm-1/(MV/cm)。一般情况下中红外波段的VSS谱可以通过傅里叶变换红外光谱仪(FTIR)测得。然而,FTIR光谱仪所使用的红外光源一般亮度较低,再考虑到VSS信号的低灵敏度和冷冻样品的各向同性等因素,要得到一个较好的VSS光谱,通常需要较长的测量时间,而电场的长时间施加无疑会增加样品介电击穿的几率。 近期IRsweep公司及斯坦福大学Jacek Kozuch团队利用微秒时间分辨超灵敏双光梳红外光谱仪-IRis-F1(Dual-comb spectrometer, DCS)成功克服了这一问题[1]。他们利用双光梳光谱仪测量了氟苯的斯塔克光谱,并发现在测量时间缩短250倍的情况下,DSC方法仍可获得与FTIR方法相媲美的定性和定量数据。对氟苯的斯塔克调谐率估算结果显示,DCS方法测得数值((0.81±0.09)cm-1 /(MV / cm))和之前报道测量数值0.84 cm-1 /(MV / cm)相吻合,并且相较传统FTIR方法测得数值((0.89±0.15)cm-1 /(MV / cm))更加。更进一步,在数据信噪比(SNR)方面,DCS表现也更胜一筹。该应用成功证明IRis-F1双光梳光谱仪所用的DSC技术可以通过其高速、短时和高亮度的特点将振动斯塔克光谱的应用领域加以拓展,并且其0.328cm-1的谱采样率相较于传统FTIR也更具优势。
检测样品: 基础有机原料
检测项: 理化分析

QUANTUM量子科学仪器贸易(北京)有限公司

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酸,碱,盐溶液中水溶性酸,碱,盐溶液表面统一的分子图像检测方案(其它光谱仪)

The molecular structure of the interfacial regions of aqueous electrolytes is poorly understood, despite its crucial importance in many biological, technological, and atmospheric processes. A long-term controversy pertains between the standard picture of an ion-free surface layer and the strongly ion specific behavior indicating in many cases significant propensities of simple inorganic ions for the interface. Here, we present a unified and consistent view of the structure of the air/solution interface of aqueous electrolytes containing monovalent inorganic ions. Molecular dynamics calculations show that in salt solutions and bases the positively charged ions, such as alkali cations, are repelled from the interface, whereas the anions, such as halides or hydroxide, exhibit a varying surface propensity, correlated primarily with the ion polarizability and size. The behavior of acids is different due to a significant propensity of hydronium cations for the air/solution interface. Therefore, both cations and anions exhibit enhanced concentrations at the surface and, consequently, these acids (unlike bases and salts) reduce the surface tension of water. The results of the simulations are supported by surface selective nonlinear vibrational spectroscopy(VSFG), which reveals among other things that the hydronium cations are present at the air/solution interface. The ion specific propensities for the air/solution interface have important implications for a whole range of heterogeneous physical and chemical processes, including atmospheric chemistry of aerosols, corrosion processes, and bubble coalescence.
检测样品: 基础有机原料
检测项: 水溶性酸,碱,盐溶液表面统一的分子图像

北京欧兰科技发展有限公司

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仪器信息网行业应用栏目为您提供227篇基础有机原料检测方案,可分别用于理化分析检测、含量分析检测、组成分析检测,参考标准主要有《HJ 759-2015 环境空气 挥发性有机物的测定 罐采样/气相色谱-质谱法》等