CN113181856B - 磁场辅助模拟零-微重力火焰合成纳米颗粒的装置和方法 - Google Patents
磁场辅助模拟零-微重力火焰合成纳米颗粒的装置和方法 Download PDFInfo
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Abstract
本发明涉及一种磁场辅助模拟零‑微重力火焰合成纳米颗粒的装置和方法,该装置包括梯度磁场装置(1)、燃烧器(2)和产物收集装置(3);所述梯度磁场装置由面对面设置的两个磁场装置构成,燃烧器位于两个磁场装置之间,燃烧器的出口竖直向上,且位置处于梯度磁场装置磁场中心下方;通过梯度磁场装置作用于火焰及其周围磁性物种的体积力以抵消重力浮升作用,在模拟的零/微重力火焰下进行火焰合成,制备纳米颗粒。相比于现有火焰合成装置,本发明的能够在地面上利用梯度磁场模拟零/微重力火焰,在特殊的火焰特性下合成纳米颗粒,火焰扰动减小,稳定性提高,不会出现过高温区,相比于现有零/微重力实验方法,成本低运行时间长。
Description
技术领域
本发明为一种火焰合成纳米颗粒的技术,特别是一种磁场辅助模拟下的零-微重力火焰合成纳米颗粒的方法和装置。
背景技术
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(1-100nm)或由它们作为基本单元构成的材料。纳米材料和纳米技术在能源、环境、资源和水处理等产业应用出现了良好的开端,纳米材料的应用范围逐步扩大。随着生物技术、先进制造技术等领域的迅猛发展,对纳米材料的要求也越来越高,元器件的小型化、智能化、高集成和超快传输等对材料尺寸的要求越来越小;航空航天、新型军事装备及先进制造技术等对材料性能要求越来越高。
火焰合成法是一种新型的纳米材料合成技术,前驱体经过热解、成核、碰撞、团聚等过程形成纳米颗粒,能用来合成几乎所有元素的氧化物。在地面常重力环境下,由于火焰内部气体被加热,重力浮升作用会使火焰中心气体加速上升形成水滴状火焰。而微重力环境下浮升力消失,火焰与周围空气只存在梯度扩散,所以会产生特殊的火焰形貌,例如低雷诺数的扩散火焰呈球形。
微重力特殊形态的火焰会影响流场,组分浓度场以及温度场,可能会对火焰合成过程中颗粒生长过程产生影响,从而改变产物颗粒形貌。一方面,由于屏蔽了重力浮升作用的影响,火焰扰动减小,稳定性提高,另一方面温度场分布均匀,不会出现组分浓度较高、剧烈反应的过高温区,能够生成粒径分布均匀的产物。同时由于微重力以扩散控制为主,燃烧速率减慢,火焰温度降低,碳烟浓度减小,会提高产品纯度。
若想在常重力下实现零/微重力火焰合成模拟,需借助传统微重力实验所需的落塔、失重飞机或在轨空间站,费用昂贵且无法实现大规模长效研究。
发明内容
技术问题:针对现有零-微重力实验方法的劣势,本发明的目的在于借助梯度磁场产生的磁力浮升作用,与重力浮升作用相抵消,提供一种磁场辅助模拟零-微重力火焰合成纳米颗粒的装置和方法。
技术方案:本发明的一种磁场辅助模拟零-微重力火焰合成纳米颗粒的装置,包括梯度磁场装置、燃烧器和产物收集装置;所述梯度磁场装置由面对面设置的两个磁场装置构成,燃烧器位于两个磁场装置之间,燃烧器的出口竖直向上,且位置处于梯度磁场装置磁场中心下方;当使用环境为地面,目的为模拟微重力火焰时,燃烧器的出口方向竖直向上,与梯度磁场装置产生的梯度磁场方向相反,此时氧气受到竖直向上的磁场梯度力,使梯度磁场力与重力相抵消,产物收集装置位于火焰下游收集合成目标产物;当使用环境为微重力环境,目的为模拟常重力火焰时,燃烧器出口方向与磁场梯度方向相同,此时氧气受到与燃烧器出口方向一致的磁场梯度力,使磁场梯度力等效为重力,在微重力环境下模拟常重力火焰合成。
其中,
所述燃烧器包括同轴燃烧器、McKenna平焰预混燃烧器、Hencken燃烧器或雾化喷嘴燃烧器。
所述的同轴燃烧器内的中心为前驱物蒸汽、前驱物蒸汽的外周为燃料、燃料的外周为氧化剂,氧化剂、燃料和前驱物蒸汽在燃烧器出口合成火焰。
所述产物收集装置包括纤维过滤器或热泳收集装置,在火焰下游收集纳米颗粒产物,
所述产物收集装置将产物直接用于化学气相沉积,用于工件表面镀膜。
所述合成目标产物包括金属氧化物、非金属氧化物、碳纳米颗粒或纳米薄膜。
所述装置的磁场辅助模拟零-微重力火焰合成纳米颗粒的方法为:采用同轴燃烧器、McKenna平焰预混燃烧器、Hencken燃烧器或雾化喷嘴燃烧器,在所述燃烧器中通入目标纳米颗粒的前驱物蒸汽、燃料和氧化剂,在燃烧器出口处点燃燃料并调节各路气流量得到适合的火焰,将火焰置于所述梯度磁场装置中,调节磁场梯度大小使火焰形成零-微重力火焰,通过产物收集装置到目标产物-纳米颗粒,实现模拟零-微重力火焰合成纳米颗粒。
所述燃烧器出口处空气为顺磁性物质,在梯度方向竖直向上的磁场作用下,会受到竖直向上的磁体积力作用;沿竖直z方向,单位体积空气所受磁化力表示为:
所述燃烧器出口处常重力下火焰内气体被加热密度减小而上升,这种作用为重力浮升作用,利用梯度磁场产生的磁场梯度,对火焰周围的空气产生竖直向上的磁力浮升作用,相当于对火焰内部气体产生了竖直向下的浮升作用,当梯度磁场对火焰内部的磁力浮升作用与重力浮升作用相互抵消时,就会形成零-微重力火焰。
其使用环境也可以用于微重力环境如在轨卫星,月球表面等。
有益效果:本发明与现有火焰合成装置相比,具有如下突出性特点和优点:
相比于现有火焰合成装置,本发明的能够在地面上利用梯度磁场模拟零-微重力火焰,在特殊的火焰特性下合成纳米颗粒,火焰扰动减小,稳定性提高,不会出现过高温区,火焰温度降低,碳烟浓度减小,能够得到粒径分布窄,纯度提高的产品。相比于现有零-微重力实验方法,成本低运行时间长。同时,本发明能够实现调节磁场参数来改变火焰合成纳米材料形貌的方法。
附图说明
图1是本发明磁场辅助模拟零/微重力火焰合成纳米颗粒装置示意图。
图中有:梯度磁场装置1、燃烧器2、氧化剂21、燃料22、前驱物蒸汽23、产物收集装置3。
具体实施方式
本发明的一种磁场辅助模拟零/微重力火焰合成纳米颗粒方法和装置,包括梯度磁场装置、燃烧器和产物收集装置;所述燃烧器通入火焰合成的前驱物、燃料和氧化剂,燃烧器出口方向与梯度磁场装置产生的梯度磁场方向呈一定角度,能够满足使梯度磁场力与重力相抵消,产物收集装置位于火焰下游收集产物。
本装置实现模拟零/微重力火焰合成的原理如下:
空气为顺磁性物质,在梯度方向竖直向上的磁场作用下,会受到竖直向上的磁体积力作用;沿竖直z方向,单位体积空气所受磁化力可表示为:
常重力下火焰内气体被加热密度减小而上升,这种作用为重力浮升作用。利用梯度磁场产生的磁场梯度,可以对火焰周围的空气产生竖直向上的磁力浮升作用,相当于对火焰内部气体产生了竖直向下的浮升作用。当梯度磁场对火焰内部的磁力浮升作用与重力浮升作用相互抵消时,就会形成零/微重力火焰。
上述燃烧器包括同轴燃烧器,McKenna平焰预混燃烧器,Hencken燃烧器,雾化喷嘴燃烧器等,在燃烧器中通入目标纳米颗粒的前驱物蒸汽、燃料和氧化剂,在燃烧器出口处点燃燃料并调节各路气流量得到适合的火焰,即可通过产物收集装置收集得到纳米产物。进而将火焰置于上述梯度磁场下,调节磁场梯度大小使火焰形成零/微重力火焰,实现模拟零/微重力火焰合成。
其使用环境也可以用于微重力环境如在轨卫星,月球表面等。
本发明磁场辅助模拟零-微重力火焰合成纳米颗粒装置的优选实施方式,如图1所示,包括梯度磁场装置1、燃烧器2和产物收集装置3;所述燃烧器2优选为同轴燃烧器,通入火焰合成的前驱物、燃料和氧化剂,燃烧器出口竖直向上,且位置处于梯度磁场装置1磁场中心下方。产物收集装置3优选为玻璃纤维制成的过滤装置,过滤装置后接真空泵,产物收集装置3位于火焰上方收集合成的纳米颗粒。
所述的同轴燃烧器内的中心为前驱物蒸汽23、前驱物蒸汽23的外周为燃料22、燃料22的外周为氧化剂21,氧化剂21、燃料22和前驱物蒸汽23在燃烧器出口合成火焰。
在燃烧器2中心通入目标纳米颗粒的前驱物蒸汽,中间层通入燃料如甲烷、氢气等,在外层通入氧化剂如空气或氧气,在燃烧器2出口处点燃燃料并调节各路气流量得到合适的火焰,即可通过产物收集装置3收集得到纳米氧化物颗粒。
Claims (10)
1.一种磁场辅助模拟零-微重力火焰合成纳米颗粒的装置,其特征在于,该装置包括梯度磁场装置(1)、燃烧器(2)和产物收集装置(3);所述梯度磁场装置(1)由面对面设置的两个磁场装置构成,燃烧器(2)位于两个磁场装置之间,燃烧器(2)的出口竖直向上,且位置处于梯度磁场装置(1)磁场中心下方;当使用环境为地面,目的为模拟微重力火焰时,燃烧器(2)的出口方向竖直向上,与梯度磁场装置(1)产生的梯度磁场方向相反,此时氧气受到竖直向上的磁场梯度力,使梯度磁场力与重力相抵消,产物收集装置(3)位于火焰下游收集合成目标产物;当使用环境为微重力环境,目的为模拟常重力火焰时,燃烧器(2)出口方向与磁场梯度方向相同,此时氧气受到与燃烧器(2)出口方向一致的磁场梯度力,使磁场梯度力等效为重力,在微重力环境下模拟常重力火焰合成。
3.根据权利要求1所述的磁场辅助模拟零-微重力火焰合成纳米颗粒的装置,其特征在于,所述燃烧器(2)包括同轴燃烧器、McKenna平焰预混燃烧器、Hencken燃烧器或雾化喷嘴燃烧器。
4.根据权利要求3所述的磁场辅助模拟零-微重力火焰合成纳米颗粒的装置,其特征在于,所述的同轴燃烧器内的中心为前驱物蒸汽(23)、前驱物蒸汽(23)的外周为燃料(22)、燃料(22)的外周为氧化剂(21),氧化剂(21)、燃料(22)和前驱物蒸汽(23)在燃烧器出口合成火焰。
5.根据权利要求1所述的磁场辅助模拟零-微重力火焰合成纳米颗粒的装置,其特征在于,所述产物收集装置(3)包括纤维过滤器或热泳收集装置,在火焰下游收集纳米颗粒产物。
6.根据权利要求1所述的磁场辅助模拟零-微重力火焰合成纳米颗粒的装置,其特征在于,所述合成目标产物包括金属氧化物、非金属氧化物、碳纳米颗粒或纳米薄膜。
7.一种如权利要求1所述装置的磁场辅助模拟零-微重力火焰合成纳米颗粒的方法,其特征在于,采用同轴燃烧器、McKenna平焰预混燃烧器、Hencken燃烧器或雾化喷嘴燃烧器,在所述燃烧器中通入目标纳米颗粒的前驱物蒸汽、燃料和氧化剂,在燃烧器出口处点燃燃料并调节各路气流量得到适合的火焰,将火焰置于所述梯度磁场装置(1)中,调节磁场梯度大小使火焰形成零-微重力火焰,通过产物收集装置(3)到目标产物-纳米颗粒,实现模拟零-微重力火焰合成纳米颗粒。
9.根据权利要求8所述的磁场辅助模拟零-微重力火焰合成纳米颗粒的方法,其特征在于,所述燃烧器出口处常重力下火焰内气体被加热密度减小而上升,这种作用为重力浮升作用,利用梯度磁场产生的磁场梯度,对火焰周围的空气产生竖直向上的磁力浮升作用,相当于对火焰内部气体产生了竖直向下的浮升作用,当梯度磁场对火焰内部的磁力浮升作用与重力浮升作用相互抵消时,就会形成零-微重力火焰。
10.一种如权利要求1所述的磁场辅助模拟零-微重力火焰合成纳米颗粒的装置的应用,其特征在于,所述磁场辅助模拟零-微重力火焰合成纳米颗粒的装置使用环境用于微重力环境的轨卫星,月球表面。
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