共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
5.
6.
7.
热裂解法在气体分离用无机膜制备中的研究进展 总被引:4,自引:1,他引:3
对热裂解法的原理、工艺、影响因素,裂解原透过机理和模型以及国内外最新进展及其应用进行了讨论和分析,并对这种方法的优缺点做了较全面的评述。 相似文献
8.
本文综述了无机分离膜在应用领域的研究情况,着重介绍了无机分离膜在气体分离、膜反应器、生物反应器和血浆成分分离等方面的应用,讨论了无机膜自身的缺陷和今后有待研究解决的课题. 相似文献
9.
圆板状α—Al2O3无机膜载体的合成与表征 总被引:8,自引:0,他引:8
从本国出产的薄水铝石(AlOOH)出发,用沉降-夺片法和筛分-压片法研制了圆板状α-Al2O3无机膜载体并通过SEM、XRD及气体渗透性等研究。从孔结构、表面形貌、气体渗稼率和分离因子等方面进行表征,结果表明,沉降法制得的载体气体渗透性比例等外分法的好得多,其渗透率是筛分法的3倍,分离因子也优于筛分法,结果还表明,干燥与灼烧温度载体性能的重要因素,硝酸蒸气处理载体对载体强度、孔结构和气体的渗性等也 相似文献
10.
无机膜的气体传递机理和模型 总被引:5,自引:0,他引:5
无机膜在高温高压和苛性环境下应用所显示的优越性日益受到人们的重视。在论述无机膜的优缺点及其应用的基础上,着重阐述和分析了致密膜、固体氧化物膜和多孔膜的气体传递机理和理论模型,最后对无机膜发展中存在和尚待解决的问题作一简要述评。 相似文献
11.
This article gives an overview about the preparation and characterization of asymmetric ceramic membranes that have been developed at our institute within the last years. Depending on the required pore size of the filter active layer for filtration applications ranging from microfiltration (MF) up to nanofiltration (NF) different preparation routes have to be applied. 相似文献
12.
This article addresses the effect of varying palladium solution concentration (0.005–0.015 mol/L) on the cost-effective fabrication of dense palladium composite membranes. Laboratory fabricated clay (kaolin) based ceramic disc were used as substrate along with a modified electroless plating technique consisting of a coupled effect of ultrasound and surfactant. Further to increase the efficacy of the process controlled addition of reducing agent was opted for all baths. It was analyzed that the optimal concentration that provided higher plating efficiencies (95.9%), higher transport efficiency (41.3%), higher plating rates (1.5 × 10?4 mol/m2 · s), minimal total plating time (10.5 h), and maximum pore densification (99.7%) corresponds to 0.01 mol/L. 相似文献
13.
14.
无机材料显微结构化学 总被引:1,自引:1,他引:0
本文综述了为说明无机材料显微结构形成有关的最重要的物理化学因素。根据显微结构图象判读的进一步要求,可首先在样品中对晶相和它们的形态外貌作鉴定,然后对特征区分别用一系列相变方程式来描述。结果,这些论述即构成了显微结构化学的基本内容,从而使显微结构分析的科学意义取得了大的进展。可以予期,显微结构化学将成为材料科学的重要分支。 相似文献
15.
16.
17.
18.
功能梯度材料:回顾与展望 总被引:2,自引:0,他引:2
本文阐述了功能梯度材料的种类、主要制备方法以及国内外研究进展和应用,对该领域的几个重要热点问题进行了讨论。此外,提出了一种新的梯度材料制备方法——等离子喷焊法,分析了该法的特点。 相似文献
19.
20.
Piran R. Kidambi Doojoon Jang Juan‐Carlos Idrobo Michael S. H. Boutilier Luda Wang Jing Kong Rohit Karnik 《Advanced materials (Deerfield Beach, Fla.)》2017,29(33)
Dialysis is a ubiquitous separation process in biochemical processing and biological research. State‐of‐the‐art dialysis membranes comprise a relatively thick polymer layer with tortuous pores, and suffer from low rates of diffusion leading to extremely long process times (often several days) and poor selectivity, especially in the 0–1000 Da molecular weight cut‐off range. Here, the fabrication of large‐area (cm2) nanoporous atomically thin membranes (NATMs) is reported, by transferring graphene synthesized using scalable chemical vapor deposition (CVD) to polycarbonate track‐etched supports. After sealing defects introduced during transfer/handling by interfacial polymerization, a facile oxygen‐plasma etch is used to create size‐selective pores (≤1 nm) in the CVD graphene. Size‐selective separation and desalting of small model molecules (≈200–1355 Da) and proteins (≈14 000 Da) are demonstrated, with ≈1–2 orders of magnitude increase in permeance compared to state‐of‐the‐art commercial membranes. Rapid diffusion and size‐selectivity in NATMs offers transformative opportunities in purification of drugs, removal of residual reactants, biochemical analytics, medical diagnostics, therapeutics, and nano‐bio separations. 相似文献