(三)熔体结晶理论T结晶作用示意图1一品体长人线速度VMl2一晶核形成速度Vm,3一粘度n
(三)熔体结晶理论
纳米矿物材料Chap.1s1纳米材料的定义和分类纳米材料的定义※教学目的与要求:一纳米材料的分类重点掌握纳米材料的定义、分类三效应、表征、矿物材料;纳米材料的表征四、纳米微粒的四大效应了解纳米粒子的合成;$2纳米粒子合成概述重点掌握纳米材料的特殊效应$3※重点、难点:纳米矿物材料纳米材料的特殊效应;
Chap.1 纳米矿物材料 §1 纳米材料的定义和分类 一、纳米材料的定义 二、纳米材料的分类 三、纳米材料的表征 四、纳米微粒的四大效应 §2 纳米粒子合成概述 §3 纳米矿物材料 ※教学目的与要求: 重点掌握纳米材料的定义、分类、 效应、表征、矿物材料; 了解纳米粒子的合成; 重点掌握纳米材料的特殊效应。 ※重点、难点: 纳米材料的特殊效应;
一、什么是纳米(nanometer)?纳米是一个长度计量单位,1纳米=10-9米人高针头红血球分子及DNA氢原子100万纳米1千 纳米1 纳米0.1纳米20亿纳米
人高 20亿 纳米 100万 纳米 针头 红血球 分子及DNA 1千 纳米 1 纳米 0.1 纳米 氢原子 Earth 1.2 x 107 m ⚫ 纳米是一个长度计量单位,1纳米 = 10-9 米。 一、什么是纳米(nanometer)?
什么是纳米结构(nanostructure)?纳米结构是以纳米尺度的物质单元为基础,按一定规律构筑或组装-种新的体系,它包括一维(纳米线or管)、二维(纳米薄膜)和三维体系。Crimpjunctions for perpendicularcarbonnanotube scaffoldingIn thisdesign,tworigiddiamondoid ringsarefusedat a quasi-tetrahedral junction and sized, throughthe addition or subtraction of repeat subunits ineachring,toaccommodatetwo carbon nanotubesof different diameters.The crimpingofthenanotubes isaresultof van derWaals packing ofthe rings,a feature that can be enhanced orremovedbyadjustingtheringsize.(grey=carbonwhite=hydrogen,blue=nitrogen,red=oxygen)Low-frictionbearingassemblywithtwocarbonallotropesInthisdesign,twodiamondoidringsreplacesmallsegments of a carbon nanotube, providing a lockforathird,largerring.Thelargerringindudesastitch-work of oxygens to create anelectron-richinterior whoseeffective circular van der Waalspacking justtouches that of the nanotubeframework
什么是纳米结构(nanostructure)? 纳米结构是以纳米尺度的物质单元为基础,按一定规律构筑或组装一 种新的体系,它包括一维(纳米线or管)、二维(纳米薄膜)和三维 体系。 In this design, two rigid diamondoid rings are fused at a quasi-tetrahedral junction and sized, through the addition or subtraction of repeat subunits in each ring, to accommodate two carbon nanotubes of different diameters. The crimping of the nanotubes is a result of van der Waals packing of the rings, a feature that can be enhanced or removed by adjusting the ring size. (grey = carbon, white = hydrogen, blue = nitrogen, red = oxygen) In this design, two diamondoid rings replace small segments of a carbon nanotube, providing a lock for a third, larger ring. The larger ring includes a stitch-work of oxygens to create an electron-rich interior whose effective circular van der Waals packing just touches that of the nanotube framework. Low-friction bearing assembly with two carbon allotropes Crimp junctions for perpendicular carbon nanotube scaffolding
什么是纳米材料(nanomaterial)?纳米材料是指在三维空间中至少有一维处于纳米尺度范围(109~10-7m)或由它们作为基本单元构成的材料nanomaterialmaterialwith oneormoreexternal dimensions,or an internalstructure,onthenanoscale,which couldexhibitnovel characteristicscomparedtothesamematerialwithoutnanoscalefeaturesNOTE Novel characteristics might include increased strength, chemical reactivity or conductivity
什么是纳米材料(nanomaterial)? 纳米材料是指在三维空间中至少有一维处于纳米尺度范围(10- 9~10-7m)或由它们作为基本单元构成的材料