Fabrication of Highly Porous Chromium Carbide with Multiple Pore Structure

2013 ◽  
Vol 97 (4) ◽  
pp. 1317-1325 ◽  
Author(s):  
Ziqiang Dong ◽  
Qinya Zhang ◽  
Weixing Chen
Keyword(s):  
Pore Structure ◽  
Chromium Carbide ◽  
Highly Porous

Unusual pore structure and sorption behaviour in a hexanodal zinc–organic framework material

2014 ◽  
Vol 50 (14) ◽  
pp. 1678-1681 ◽  
Author(s):  
Jinjie Qian ◽  
Feilong Jiang ◽  
Linjie Zhang ◽  
Kongzhao Su ◽  
Jie Pan ◽  
...  
Keyword(s):  
Pore Structure ◽  
Metal Organic Framework ◽  
Porous Metal ◽  
Sorption Behaviour ◽  
Metal Organic ◽  
Highly Porous ◽  
Organic Framework

A highly porous metal–organic framework structurally consists of three topological kinds of 3-connected 1,3,5-benzenetricarboxylate ligands, Zn2(COO)4, Zn3O(COO)6 and Zn4O(COO)6 SBUs, featuring a new 3,3,3,4,4,6-c hexanodal topology.

Highly Porous Carbon Derived from Sunflower Seed Shell for Electrochemical Capacitor

2011 ◽  
Vol 287-290 ◽  
pp. 1420-1423 ◽  
Author(s):  
Wei Xing ◽  
Xiao Li ◽  
Xiu Li Gao ◽  
Shu Ping Zhuo
Keyword(s):  
Pore Structure ◽  
Electrode Material ◽  
Sunflower Seed ◽  
High Performance ◽  
Chemical Activation ◽  
Electrochemical Capacitor ◽  
Drain Current ◽  
Porous Carbons ◽  
Activation Temperature ◽  
Highly Porous

Highly porous carbons were prepared from sunflower seed shell (SSS) by chemical activation and used as electrode material for electrochemical double layer capacitor (EDLC). The surface area and pore structure of the porous carbons are characterized intensively using N2 adsorption technique. The results show that the pore-structure of the carbons is closely related to activation temperature. Electrochemical measurements show that the carbons have excellent capacitive behavior and high capacitance retention ratio at high drain current, which is due to that there are both abundant macroscopic pores and micropore surface in the texture of the carbons. More importantly, the capacitive performances of these carbons are much better than ordered mesoporous carbons, thus highlighting the success of preparing high performance electrode material for EDLC from SSS.

Vanadium nitride@N-doped carbon nanocomposites: tuning of pore structure and particle size through salt templating and its influence on supercapacitance in ionic liquid media

RSC Advances ◽  
2014 ◽  
Vol 4 (51) ◽  
pp. 26981-26989 ◽  
Author(s):  
Nina Fechler ◽  
Girum Ayalneh Tiruye ◽  
Rebeca Marcilla ◽  
Markus Antonietti
Keyword(s):  
Particle Size ◽  
Ionic Liquid ◽  
Pore Structure ◽  
Pore Volume ◽  
Porous Metal ◽  
Vanadium Nitride ◽  
Carbon Composites ◽  
Liquid Media ◽  
Carbon Nanocomposites ◽  
Highly Porous

Using salts as porogens, highly porous metal nitride@N-doped carbon composites with tunable surface area, pore size, pore volume and particle size are synthesized and systematically tested as supercapacitor electrodes.

Understanding the Impact of Porosity and Pore Structure in Ultra Low Dielectric Constant Organosilicate Glasses

2012 ◽  
Vol 1428 ◽  
Author(s):  
Irene J. Hsu ◽  
Raymond N. Vrtis ◽  
Jennifer E. Al-Rashid ◽  
Anupama Mallikarjunan ◽  
Kathleen E. Theodorou ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Mechanical Strength ◽  
Pore Structure ◽  
Pore Size Distribution ◽  
Low Dielectric Constant ◽  
Film Properties ◽  
Low Dielectric ◽  
The Impact ◽  
Organosilicate Glasses ◽  
Highly Porous

ABSTRACTRecently there have been a number of reports indicating concern relating to the effect of porosity, pore size distribution, and pore interconnectivity on the integration of highly porous ultra low-k organosilicate glasses (OSGs) as back-end-of-line (BEOL) interconnect dielectrics. In an effort to address these concerns a number of options to control the skeleton and pore structure of OSGs have been proposed, from adding alternative OSG precursors to alternative porogen precursors. In all these options there is a need to balance pore structure modification with critical film properties such as dielectric constant and mechanical strength. In this context, this paper examines porosity and its impact on film properties for highly porous ultra low dielectric constant films. A series of PDEMS® porous OSG films were deposited by plasma enchanced chemical vapor deposition (PECVD) from DEMS® precursor (diethoxymethylsilane) and porogen ATRP (alpha-terpenine). The percent porosity and pore interconnectivity of these films relative to the dielectric constant were measured by ellipsometric porosimetry (EP) and positron annihilation spectroscopy (PALS) respectively. Porosity and pore-size distribution for films deposited using several different species (structure former or porogen precursors) were examined using EP in an effort to understand the impact of the chemical nature of the precursor on pore morphology. Results from these depositions show that it is possible to deposit films with smaller pores using alternative structure formers (ASFs) with bulky organic groups, although there are tradeoffs with respect to other film characteristics. The addition of a separate porogen (ATRP) to the ASF lowered the dielectric constant and the addition of DEMS® precursor to the ASF/ATRP mix gave the films added structural integrity and mechanical strength. Such a fundamental understanding of structure-property relationships will help support successful integration of these porous OSG films.

PAPER INK INTERACTIONS. The effect of coating pore structure and geometry on the drying efficiency of heatset web-offset ink solvent

2012 ◽  
Vol 27 (4) ◽  
pp. 750-756
Author(s):  
Philip M. Gerstner ◽  
Hai Zhang ◽  
Patrick A.C. Gane
Keyword(s):  
Calcium Carbonate ◽  
Pore Structure ◽  
Dominant Factor ◽  
Drying Rate ◽  
Diffusion Resistance ◽  
High Permeability ◽  
Rate Period ◽  
Liquid Clusters ◽  
Drying Efficiency ◽  
Highly Porous

Abstract This work examines the effect of coating pore structure on the evaporation behaviour of mineral oil, as a typical heatset web-offset ink solvent. Two different kinds of coating pigments are compared, a standard ground calcium carbonate (GCC) and a highly porous modified calcium carbonate (MCC) with fine intraparticle pores. The aim is to identify relevant pore structure parameters and their effect on the drying rate. Two internal stages of drying were identified for both structures : a rising drying rate period and a falling rate period. In the rising rate period, the effect of film tlow was of particular relevance for the case of GCC based structures : binder, filling the pore structure decreases the detail of geometry and thus reduces the film flow tendency, progressively depressing the drying rate. At the onset of the falling rate period the liquid phase is in the form of disconnected liquid clusters. Therefore, the diffusion resistance becomes a dominant factor. Because of the high permeability of MCC systems the evaporation rate proofed to be largely unsusceptible to the binder concentration. However, the GCC pigment systems exhibited an extended peak of the drying rate as a result of the increasing diffusion resistance with increasing binder content.

scholarly journals The Effect of Pressure on Pore Structure in Mercury Porosimetry

1987 ◽  
Vol 4 (4) ◽  
pp. 241-250 ◽  
Author(s):  
A.M.L. Hustings ◽  
J.J.F. Scholten
Keyword(s):  
Mechanical Strength ◽  
Pore Structure ◽  
Pore Volume ◽  
Pressure Range ◽  
Capillary Condensation ◽  
Mercury Porosimetry ◽  
Porous Structures ◽  
Effect Of Pressure ◽  
High Mercury ◽  
Highly Porous

The pore volume distributions of chrysotile, Mg3(OH)4. Si2O5, ZrO2 and of four samples of silica with pore volumes from 1.45 to 2.70 cm3/g have been measured by means of nitrogen capillary condensation and mercury penetration. It is shown that compaction of the porous structures can occur under the influence of the high mercury pressures applied. The degree of compaction depends on the mechanical strength of the sample, its initial porosity and the magnitude of the mercury pressure. The extremely strong ZrO2 sample, with its low pore volume of 0.18 cm3/g does not show any sign of cracking up to pressures as high as 190 MPa. Hollow chrysotile needles compact in the pressure range from 100 to 400 MPa. Highly porous silicas all show severe compaction. In accordance with Brown & Lard (Brown & Lard, 1974) it is concluded that silicas with pore volumes larger than 1.2 cm3/g are not suitable for study by mercury porosimetry.

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