نتایج جستجو برای: nanoporous materials

تعداد نتایج: 440024  

2017
Zhuo Xing Feng Ren Hengyi Wu Liang Wu Xuening Wang Jingli Wang Da Wan Guozhen Zhang Changzhong Jiang

Nanostructured Si as the high efficiency photoelectrode material is hard to keep stable in aqueous for water splitting. Capping a passivation layer on the surface of Si is an effective way of protecting from oxidation. However, it is still not clear in the different mechanisms and effects between insulating oxide materials and oxide semiconductor materials as passivation layers. Here, we compar...

Journal: :international journal of nano dimension 0
a. majedi school of chemistry, college of science, university of tehran, tehran, islamic republic of iran f. davar department of chemistry, isfahan university of technology, isfahan, 84156-83111, islamic republic of iran a. r. abbasi school of chemistry, college of science, university of tehran, tehran, islamic republic of iran

photocatalytic degradation of toxic organic compound in water, soil and air by semiconductor catalysts such as tio2 and zno have received much attention over the last two decades. however, the low quantum yield, easy agglomeration and difficult post-separation of these inorganic catalysts limit their application for large-scale applications. metal-organic frameworks (mofs) are the latest class ...

2005
V. M. Prida D. Navas K. R. Pirota M. Hernandez-Velez A. Menéndez N. Bordel R. Pereiro A. Sanz-Medel B. Hernando M. Vázquez

During the last decade, a great variety of nanostructures (nanotubes, nanofibers or nanowires) based on metals, carbons, polymers or semiconductors, have been synthesized following different synthesis procedures by using nanoporous anodic alumina membranes (AAM) as templates [1]. The principal reason for using templates of nanoporous AAM as precursor patterns lies on the possibility to obtain, ...

Journal: :Nanoscale 2013
Irene Emmanuelawati Jie Yang Jun Zhang Hongwei Zhang Liang Zhou Chengzhong Yu

A facile spray drying technique has been developed for large-scale and template-free production of nanoporous silica with controlled morphology, large pore size, and high pore volume, using commercially available fumed silica, Aerosil 200, as a sole precursor. This approach can be applied to the preparation of functional nanoporous materials, in this study, lanthanum oxide functionalised silica...

Journal: :Chemical Society reviews 2014
Aijuan Zhang Qingkun Zhang Hua Bai Lei Li Jun Li

Both academia and industries have put great efforts into developing non-destructive technologies for the fabrication of polymeric nanoporous materials. Such non-destructive technologies developed with supercritical CO2 (scCO2) and CO2-expanded liquids (CXLs) have been attracting more and more attention because they have been demonstrated to be green and effective media for porous polymer prepar...

Journal: :Small 2008
Gang Ouyang Guowei Yang Changqing Sun Weiguang Zhu

Nanoporous structures have become the focus of intensive research in recent years owing to their unique applications in mesoscopic physics and chemistry, and potential technological applications, including sensing, catalysis, DNA translocation, and as templates for nanostructure self-assembly. The study of nanoporous structures such as nanopore-, nanocavity-, and nanochannel-array materials can...

Journal: :Proceedings in applied mathematics & mechanics 2023

Recently proposed constitutive models that describe the mechanical behavior of open-porous cellular materials take into account random pore sizes but not randomness in shapes [1]. In present contribution, a computational model to reconstruct highly irregular structure porous is developed using sphere packing and Laguerre-Voronoi tessellation [2]. The structure-property relationship then investi...

2011
Jarian Vernimmen Vera Meynen Pegie Cool

In the last decade, research concerning nanoporous siliceous materials has been focused on mesoporous materials with intrinsic zeolitic features. These materials are thought to be superior, because they are able to combine (i) the enhanced diffusion and accessibility for larger molecules and viscous fluids typical of mesoporous materials with (ii) the remarkable stability, catalytic activity an...

2015
Sachar Ichilmann Kerstin Rücker Markus Haase Dirk Enke Martin Steinhart Longjian Xue

Evaporation of volatile liquids from nanoporous media with bicontinuous morphology and pore diameters of a few 10 nm is an ubiquitous process. For example, such drying processes occur during syntheses of nanoporous materials by sol-gel chemistry or by spinodal decomposition in the presence of solvents as well as during solution impregnation of nanoporous hosts with functional guests. It is comm...

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