应用ICP-MS测定石脑油中硅的方法研究

采用优化的微波消解条件进行石脑油样品处理,应用ICP-MS对石脑油中硅含量分析方法进行了探索研究.方法的检出限为0.007μg/mL,相对标准偏差≤3.56%,样品加标回收率在92.7%-106.3%之间.该方法简便、快速,准确度高,适用于批量轻质石油样品中硅的检测需求.     

等离子体发射光谱法测定单晶硅中微量锗

本文阐述了用等离子体发射光谱法测定单晶硅中微量锗的方法。试验了三种样品制备方法，结果表明，样品溶解于硝酸加氢氟酸中，除云硅后直接测定锗的方法最好，其检出限是0.0237μg/mL，合成样品的回收率为99.9%－100.2%，相对标准偏差小于3.6%。     

一种快速测定草类原料制浆黑液中硅含量的新方法

应用基于α-型硅钼黄显色的分光光度法进行草类原料蒸煮黑液中硅含量的测定。测定波长360nm,pH 4.0,时间10min。实验中采用过氧化氢-硝酸消解法消除样品中木素成分对光度检测的干扰。研究表明:该方法的相对偏差及回收率分别为0.9%和99.0%～102%。该方法具有操作简便、快速,稳定性好,准确性高,试剂干扰少的优点,可用于黑液中高硅含量的日常快速分析。     

有机相直接进样ICP-OES快速测定车用汽油中微量硅（英文）

车用汽油样品用异辛烷溶剂适当比例稀释,直接进入电感耦合等离子体光谱仪(ICP-OES)测定硅元素。考察了稀释溶剂及稀释比例、标准物质类型、样品冷却温度、汽油样品组成等因素对硅含量测定的影响。结果表明,汽油样品用异辛烷按1∶1的比例混溶,在雾化室冷却温度为-10℃时,直接进入ICP-OES测定硅含量效果最佳。在优化的工作条件下,该方法在0.1~10.0 mg·kg~(-1)硅含量范围内线性良好,线性相关系数达0.999 96,检出限为0.012 mg·kg~(-1),回收率在95.8%~98.4%之间,相对标准偏差小于3.0%。该法简便、快速、准确度高,适用于车用无铅汽油、车用乙醇汽油和低比例甲醇汽油中微量硅的快速检测。     

ICP-AES测定微硅粉中Ca、Mg、Fe和Al的含量

微硅粉样品经氢氟酸、硝酸、高氯酸消解,电感耦合等离子体-原子发射光谱法（ICP-AES）测定Ca、Mg、Fe、Al杂质元素含量。方法的回收率为：Ca 95.2%—100.3%,Mg 96.2%—99.6%,Fe 95.8%—97.2%,Al 98.6%—104.6%,精密度在1.50%—2.59%之间。本方法线性范围宽、分析效率高、具有良好的准确性和精密度,能快速准确地测定微硅粉中Ca、Mg、Fe和Al杂质元素的含量。     

硅钼蓝分光光度法测定去离子水中的微量二氧化硅

研究了抗坏血酸作为还原剂硅钼蓝分光光度法测定去离子水中的微量二氧化硅的适宜条件.实验表明,常温下10min可显色完全,对去离子水进行7次测定,方法精密度RSD≤7%,样品加标回收率为97%,测定结果与国家标准结果一致.     

固相萃取-高效液相色谱法测定烟叶中吡虫啉农药残留量

建立了固相萃取-高校液相色谱法测定烟叶中吡虫啉农药残留量的方法。样品用乙腈提取,弗罗里硅土固相萃取柱净化.梯度洗脱方式分离,DAD二极管阵列检测器检测。吡虫啉加标回收率为87.83%—94.80%,相对标准偏差为1.64%,检出限为0.01μg/g。该方法灵敏、准确,适用烟草中吡虫啉农药残留的分析。     

电感耦合等离子体-原子发射光谱法测定陶瓷颜料中的多种元素

采用电感耦合等离子体-原子发射光谱法(ICP-AES)同时测定了陶瓷颜料中的镉、锌、钛、铬、铁、钙、镁等多种元素。样品经王水的缓慢溶解,再加入氢氟酸除硅。在HNO3介质中,用ICP-AES测定其中的多种元素。讨论了溶样条件、基体效应等影响因素。在选定的仪器最佳条件下,该方法测定各元素的相对标准偏差(RSD,n=12)在0.52%—3.06%之间,加标回收率在98.6%—104.3%之间。该方法分析实际样品,分析结果与其他方法一致。     

ICP-OES测定汽油中的硅

试样经高温灰化后,硝酸处理。采用电感耦合等离子体发射光谱仪测定汽油中硅含量。结果表明,硅含量在0—10μg/mL范围内线形关系良好,r=0.9999,RSD为0.980%—13.620%,回收率95.0%—111.6%。     

ICP-AES测定鲜蔬果等农作物中硅

试样经料理机打成浆体,湿-干法（700-750℃）消解完全,HCI-HF溶解后,加入适量H_3BO_3消除氟离子干扰,基体匹配后用ICP-AES测定鲜蔬果等农作物中硅。方法检出限0.48mg/L,回收率88%—120%,ICP-AES测定值与重量法测定值一致。本方法可快速、准确测定Si含量≥2.4mg/kg的农作物样品。     

硅铁合金中硅的间接测定

通过对样品的Ｘ光物相分析,探明硅铁合金的成分,经分光光度法测定铁的含量。从而间接地得到非单质硅的含量。本方法快速准确,为硅铁中有效硅的含量分析提供了一条捷径。     

Raman Scattering of Light by Molecules of Methyl Orange Dye on the Surface of Silicon Containing Ion-Synthesized Silver Nanoparticles

The possibility of using a new composite material based on porous silicon containing silver nanoparticles and synthesized by means of a unique implantation nanotechnology as an optically sensitive material in biological and chemical sensors is tested experimentally. It is demonstrated that detection of small amounts of the studied organic substance (methyl orange dye) is possible due to the effect of surface-enhanced Raman scattering (SERS) from the molecules affected by the local electromagnetic field of the silver nanoparticles.     

Preparation and atomic oxygen erosion resistance of silica film formed on silicon rubber by sol-gel method

Based on the characteristic that silicon coupling agents have the capability to develop ‘molecular bridge’ in the interface of organic materials and inorganic materials, silica films were prepared on the surface of flexible silicon rubber by sol-gel method and the optical transmittance of the sample before and after atomic oxygen irradiation was tested. The surface morphology and structure of silica films were investigated by scanning electronic microscope (SEM) and Fourier transformed infrared spectroscopy (FTIR). The results indicated that the silica sol could easily form a uniform thin film on the surface of silicon rubber pretreated by high concentration silicon coupling agents, and the inorganic silica films could combine with organic silicon rubber without obvious delamination on the interface.     

Preparation of amino-terminated monolayers via hydrolysis of phthalimide anchored to Si(1 1 1)

Phthalimide monolayers were prepared on silicon (1 1 1) by the reaction of hydrogen-terminated silicon surfaces with vinylphthalimide. The hydrolysis reaction of phthalimide on silicon surfaces was performed in a methylamine solution to prepare amino-terminated monolayers. A series of reactions to prepare amino-terminated monolayers was investigated with attenuated total reflectance infrared spectroscopy and atomic force microscopy. This work provides a simple method to prepare amino-terminated organic monolayers act as anchor layers to immobilize functional molecules such as dyes, DNA and proteins.     

一种简单高效的制备硅纳米孔阵结构的方法

本文介绍了一种简单高效的制备硅纳米孔阵结构的方法. 利用激光干涉光刻技术, 结合干法和湿法刻蚀工艺, 直接将光刻胶点阵刻蚀为硅纳米孔阵结构, 省去了图形反转工艺中的金属蒸镀和光刻胶剥离等必要步骤, 在2英寸的硅 (001) 衬底上制备了高度有序的二维纳米孔阵结构. 利用干法刻蚀产生的氟碳有机聚合物作为湿法刻蚀的掩膜, 以及在干法刻蚀时对样品进行轻微的过刻蚀, 使SiO₂点阵图形下形成一层很薄的硅台面, 是本方法的两个关键工艺步骤. 扫描电子显微镜图片结果表明制备的孔阵图形大小均匀, 尺寸可控, 孔阵周期为450 nm, 方孔大小为200–280 nm. 关键词： 激光干涉光刻 纳米阵列 刻蚀 氟碳有机聚合物     

Phase transitions in a nonuniformly stressed state of matter

The nucleation of a new phase of a substance in a nonuniform stress field created during measurements of rigidity is considered. The phase diagram of silicon containing the Si I, II, and V phases are considered. The high-pressure boundaries of the phases formed near the indenter are found using the finite elements method.     

Study on a vapor sensor based on the optical properties of porous silicon microcavities

In this paper, we set up a sensing model of PSMs (porous silicon microcavities) by applying the Bruggeman effective medium approximation theory and the transfer matrix method. In addition, we explain in detail the adsorption characteristics of porous silicon. Finally, using an experimental setup to measure the reflectivity spectrum of PSMs when the sensor is exposed to different organic vapors, the experimental results prove that it is a feasible optical sensor for the detection of organic species. Resolution of the PSMs sensor is high, response time and resume time is short and repetition is good.      

ICP-AES法测定金属硅中的Al、B、Ba、Ca、Cr、Cu、 Fe、Mg、Mn、Ni、Sr、Ti、V和Zn杂质元素

本文提供了一种测定金属硅中Ｂ,Ｆｅ,Ａｌ,Ｃａ,Ｍｎ等１４个杂质元素的ＩＣＰ－ＡＥＳ方法,在样品处理过程中,加入适量体积的甘露醇能够抑制Ｂ的挥发。用本方法测定了一个国家地球化学标准样（ＧＳＲ－４）,结果令人满意。     

X-ray standing wave studies of metal ions incorporation in Langmuir–Blodgett films

The molecular organization in Langmuir–Blodgett films of phospholipids and metallomesogen deposited on silicon has been studied by the X-ray standing-wave method at the synchrotron radiation source BESSY (Germany). Analysis of the experimental data obtained made it possible to determine the composition of the organic multilayer nanosystems and localize the position of metal ions incorporated in organic layers from the aqueous subphase during film deposition.     

多孔硅后处理对其镶嵌染料光学特性的影响

对多孔硅进行真空退火处理和暴露大气快速退火处理,将有机染料香豆素102(C102)镶嵌其中,研究镶嵌复合膜发光特性的变化。通过比较多孔硅退火处理前、后傅立叶红外(FT-IR)吸收光谱的变化,从多孔硅与镶嵌染料分子间的能量传递方式角度出发,解释了PS表面态氧化能改善镶嵌复合膜发光特性的原因。实验通过改变多孔硅表面态,提高了复合膜的发光效率和多孔硅基体的透明程度,证明了多孔硅是一种良好的载体,在发展固体激光器方面有一定的应用,同时为实现硅基蓝绿发光开辟一条新的途径。