Study on the Stabilizing Conditions of W／O Microemulsion

The stabilizing conditions of W/O microemulsion of Tx-6-C4H9OH/c-C6h12/H2O system were studied by visual observation.The result shows that when the weight ratio of Tx-6 to C4H9OH is 4:1 ,the W/O microemulsion system has stabilizing and extensive regions,and the system is insensitive to the values of pH and in the range of room temperature.In accordance with the theoretical value of HLB,the suitable value of HLB for Tx-6 and C4H9OH to compose microemulsion is greater than 9,less than or equal to 10 value of HLB.the suitable value of HLB for Tx-6 and C4H9OH to compose microemulsion is greater than 9,less than or equal to 10.     

硒和碲对钒氧化物电阻温度曲线的影响

用微熔烧结法制备了[MTeO]x(V_2O_3)_(1-x)和含Se的VO_2试样.电阻率温度曲线测量表明,所有试样在338±3K有一个量级的电阻率降落,(V_2TeO_2)_(0.05)(V_2O_3)_(0.95)试样在340K有由负电阻温度系数(NTC)到正电阻温度系数(PTC)突变.用V,Te,Se可变价观点讨论了所得的结果。     

氧化铁微米晶溶剂热合成实验新方法

探索了表面活性剂调控下磁性氧化物微米晶溶剂热合成实验的新方法。以二茂铁和乙醇为初始原料,利用表面活性剂修饰产物表面,在溶剂热体系中制备了单分散性、形貌均一的球状Fe3O4微米晶体,实现了对Fe3O4晶体形貌及尺寸的调控,并用XRD、ESEM、TEM等手段进行了表征。通过对乙酸钠的添加量、温度效应和时间效应的单因素探究,发现反应物浓度、温度和时间的改变对产物的形貌都有很大的影响,只有在一个较窄的区间内才可以得到形貌规整的球状微米晶体。总结了反应物浓度、反应温度和反应时间等实验条件与产物晶体尺度及形貌的关系。     

锡氧化物电热膜材料能带的研究

从电热转换元件的电毁现象出发，利用膜材料电性能的各向同性的性质，建立了一维晶粒列模型，给出了晶粒列模型的平衡态能带图和带尾态分布；分析了电子在越过晶间势垒时受到的散射情况．根据带尾态的分布给出了晶粒子大小与材料电导的关系．     

分清类型 正确解答--例析氮的氧化物计算

氮的氧化物计算是氮族元素考查的重点内容,涉及的类型较多,考生只有分清类型才能正确解答．解题方法主要有关系式法、电子守恒法,有时还可用差量法和原子守恒法．     

帮你理清非金属元素的性质及递变规律

元素及其化合物的知识在中学化学教材中占有较大的比例,内容繁多琐碎,在学习时要尽可能以最佳的方法或方式总结成网络图,主线明确、脉络清晰．每族元素抓住代表物．重点讨论该元素的单质、氧化物、氢化物、酸、碱或盐等有关知识;注意该族元素与其代表物在结构、性质上的相似性、递变性和特殊性．高考重点考查各族元素的单质及其化合物的性质,学习非金属元素时要理清非金属元素的性质及递变规律等问题．     

解析2007年有关碳和碳的氧化物的中考题

一、碳单质的性质 例 （威海）据报道,科学家己研制出世界上最薄的材料一碳膜片,其厚度只有一根头发的二十万分之一．如图所示,这种碳膜片状如蜂巢,是由碳原子构成的六边形单元向外延展而成．下列有关碳膜片的说法中,正确的是（ ）     

机械力活化固相化学反应法制备CeXZr1_xO2纳米复合氧化物

Nanometer cerium-zirconium oxide solution Ce1-x ZrxO2 was synthesized by mechanically activated solid state re-action at middle-low temperatures, with Ce2(CO3)3, ZrOC12-8H2O and H2C2O4.2H2O as raw materials. The crystal structureand microstructure of the nanometer Ce1-xZrxO2 were studied with X-ray diffractometry (XRD) and transmission electronmicroscope (TEM). The results show that the product is single-cubic-phase solid solution with an average crystal size 19.64nm. In this article, the influence of surface active agent is also evaluated. Mechanically activated solid state reaction for thepreparation of Ce1-xZrxO2 is a new technique of green chemistry without solvent and waste.     

一步合成氧化铟液化气传感器

A liquefied petroleum gas （LPG） sensor with high selectivity, sensitivity and low power consumption has been developed based on indium oxide with very low resistance. Nanocrystalline In203 gas sensing materials were directly synthesized through a one-step controllable solvothermal process at 210 ℃ for 24 h, using InCI3.4H2O as the starting material, cetyltrimethyl ammonium bromide （CTAB） as additive and ethanol as the solvent. The obtained samples were characterized by X-ray diffraction （XRD）, and transmission electron microscopy （TEM）. The results showed that indium oxide takes on uniform cubic shape with range size of 10~30 nm and fine dispersivity. Gas sensitivity was measured in a mixing static gas. The results indicated that 3.0 V is the best working voltage of the sensor to LPG. Sensitivity is 12.6. The response-time and recovery-time are 3 s and 10 s respectively. Power consumption is only around 200 mW.     

基于宽禁带氧化物半导体的紫外测试仪研制

以溶胶凝胶法制备的宽禁带氧化物半导体为基底,磁控溅射法制备的Pt为插指电极材料,在Si衬底上依次制备氧化物半导体薄膜、插指Pt电极、外层氧化物半导体薄膜,形成夹层式MSM型紫外探测芯片,并连接至底座,得到紫外探测器件。该器件结构不但实现了对插指电极的保护封装,并且提高了探测芯片自身的稳定性。以该器件为核心进行了外围电路的设计,用功能模块进行光强度向电压信号的转换,并且将入射紫外光的强度通过显示屏显示出来。经封装,最终得到一款性能良好,功能完备的紫外测试仪。