Requirements for performance characterization of C double-layer supercapacitors: Applications to a high specific-area C-cloth material

2006 ◽  
Vol 156 (2) ◽  
pp. 725-740 ◽  
Author(s):  
Jianjun Niu ◽  
Wendy G. Pell ◽  
Brian E. Conway
Keyword(s):  
Double Layer ◽  
Specific Area ◽  
Performance Characterization ◽  
High Specific Area

Synthesis and characterization of pecan nutshell-based adsorbent with high specific area and high methylene blue adsorption capacity

2019 ◽  
Vol 276 ◽  
pp. 570-576 ◽  
Author(s):  
Hugo H.C. Lima ◽  
Rogério S. Maniezzo ◽  
Maria E.G. Llop ◽  
Vincente L. Kupfer ◽  
Pedro A. Arroyo ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Specific Area ◽  
Synthesis And Characterization ◽  
Methylene Blue Adsorption ◽  
Pecan Nutshell ◽  
High Specific Area

scholarly journals Cellulose Nanocrystals: From Classical Hydrolysis to the Use of Deep Eutectic Solvents

2020 ◽  
Author(s):  
Manon Le Gars ◽  
Loreleï Douard ◽  
Naceur Belgacem ◽  
Julien Bras
Keyword(s):  
Mechanical Properties ◽  
Cellulose Nanocrystals ◽  
Specific Area ◽  
Deep Eutectic Solvents ◽  
Barrier Properties ◽  
Chemical Modifications ◽  
Medical Electronic ◽  
High Specific Area ◽  
Rheological Modifier

During the last two decades, interest in cellulosic nanomaterials has greatly increased. Among these nanocelluloses, cellulose nanocrystals (CNC) exhibit outstanding properties. Indeed, besides their high crystallinity, cellulose nanocrystals are interesting in terms of morphology with high aspect ratio (length 100–1000 nm, width 2–15 nm), high specific area, and high mechanical properties. Moreover, they can be used as rheological modifier, emulsifier, or for barrier properties, and their surface chemistry opens the door to numerous feasible chemical modifications, leading to a large panel of applications in medical, electronic, composites, or packaging, for example. Traditionally, their extraction is performed via monitored sulfuric acid hydrolysis, leading to well-dispersed aqueous CNC suspensions; these last bearing negative charges (half-sulfate ester groups) at their surface. More recently, natural chemicals called deep eutectic solvents (DESs) have been used for the production of CNC in a way of green chemistry, and characterization of recovered CNC is encouraging.

Synthesis and Characterization of Organophilic Clay from Cuban Chiqui Gomez Bentonite

2010 ◽  
Vol 660-661 ◽  
pp. 1093-1098 ◽  
Author(s):  
Guillermo R. Martín Cortés ◽  
Ticiane S. Valera ◽  
Fabio José Esper ◽  
Wildor Theodoro Hennies ◽  
Francisco Rolando Valenzuela-Díaz
Keyword(s):  
Structural Parameters ◽  
Specific Area ◽  
Clay Nanocomposites ◽  
Drilling Fluids ◽  
Octahedral Sheet ◽  
Organophilic Clays ◽  
Swelling Capacity ◽  
Organophilic Clay ◽  
High Specific Area

Smectites are clay mineral with a layered structure and nanometric thickness, high specific area and a huge variety of uses. Consisting on stacked layers of about 1nm thickness, including two silica tetrahedral and one octahedral sheet. Properties of natural Smectites can be enhanced by organic modification, due to the substitution of the exchangeable cations in the interlayer area. In fact, the properties of the modified smectite (organophilic clay) are related to its modified chemical composition and structural parameters. The interaction of smectite clays with surfactants has an important interest in the fields of drilling fluids, paints, cosmetic, ceramic industries and others. Recent applications are: remediation of contaminated areas and polymer/clay nanocomposites. The aim of this paper is to obtain organophilic clays using a bentonite from the Chiqui Gómez deposit in Central Cuba. The raw and organophilic clays were analyzed by DRX, SEM, swelling capacity in organic solvents and others.

Synthesis and characterization of mesoporous alumina with high specific area via coprecipitation method

Vacuum ◽  
2016 ◽  
Vol 133 ◽  
pp. 1-6 ◽  
Author(s):  
Lili Zhang ◽  
Yusheng Wu ◽  
Linnan Zhang ◽  
Yuzheng Wang ◽  
Mingchun Li
Keyword(s):  
Specific Area ◽  
Mesoporous Alumina ◽  
Coprecipitation Method ◽  
Synthesis And Characterization ◽  
High Specific Area

scholarly journals Performance characterization of a helicon double layer thruster using direct thrust measurements

2011 ◽  
Vol 44 (23) ◽  
pp. 235201 ◽  
Author(s):  
Sabrina Pottinger ◽  
Vaios Lappas ◽  
Christine Charles ◽  
Rod Boswell
Keyword(s):  
Double Layer ◽  
Performance Characterization

Synthesis and Characterization of Stable Mesoporous Multilamellar Silica Vesicles

2007 ◽  
Vol 121-123 ◽  
pp. 473-478 ◽  
Author(s):  
Yu Fang Zhu ◽  
Jian Lin Shi ◽  
Wei Hua Shen
Keyword(s):  
Pore Volume ◽  
Specific Area ◽  
Synthesis And Characterization ◽  
N2 Adsorption ◽  
Structure Directing Agent ◽  
Large Pore Volume ◽  
Desorption Isotherms ◽  
Adsorption Desorption ◽  
High Specific Area

A family of mesoporous multilamellar silica vesicles has been successfully synthesized by using P123 as structure directing agent and hexane as co-surfactant. The structure was characterized with XRD, TEM, and N2 adsorption-desorption isotherms. This multilamellar silica vesicle materials process high specific area, large pore volume, and a bimodale pore size distribution. Furthermore, these materials are stable when the surfactant is removed at 530 oC.

scholarly journals Electrochemical desalination of nacl solutions by electrosorption on nano-porous carbon aerogel electrodes

2014 ◽  
Vol 16 (4) ◽  
pp. 609-615 ◽  
Keyword(s):  
Double Layer ◽  
Applied Voltage ◽  
Redox Reactions ◽  
Specific Area ◽  
Carbon Aerogel ◽  
Significant Loss ◽  
Experimental Conditions ◽  
Chemical Inertness ◽  
Nacl Concentration ◽  
High Specific Area

<div> <p>The objective of this study is to elucidate the efficiency of electrosorption on desalination of aqueous NaClsolution using nano-structured carbon aerogel electrodes. The experiments were performed in an electrosorption cell consisting of a pair of carbon aerogel sheets separated by a 0.5cm spacer. The electrosorption performance is investigated with different applied voltages and solution concentrations. It increases with increasing applied voltage, higher concentration gradient and less double-layer overlapping effect. Under the experimental conditions at the optimum applied voltage of 1.2 Volt and initial NaCl concentration 100 - 1000 mg l<sup>-1</sup>, the electrosorption capacity was found to be 5.20 - 14.22 mg NaCl/g carbon aerogel.Na<sup>+</sup> and Cl<sup>-</sup> ions are electro-absorbed at the electrical double layer without electron transfer redox reactions at anode and cathode. The good electrosorption performance of carbon aerogel electrodes might be attributed to their high specific area, high electrical conductivity, chemical inertness and optimal pore size distribution for the passage and easy movement of ions during electrosorption and electrodesorption. The process is reversible, as the electrode charge/discharge procedure can be repeated innumerable times without any significant loss of salt sorption capacity in all cycles.&nbsp;</p> </div> <p>&nbsp;</p>

Electric Double Layer Capacitor of Multiwall Carbon Nanotubes under Different Degree of Acid Oxidations

2014 ◽  
Vol 802 ◽  
pp. 186-191
Author(s):  
Eduardo Saito ◽  
Vagner Eduardo Caetano ◽  
Erica Freire Antunes ◽  
Anderson Oliveira Lobo ◽  
Fernanda Roberto Marciano ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Double Layer ◽  
Multiwall Carbon Nanotubes ◽  
Reference Electrode ◽  
Chemical Vapor ◽  
Specific Area ◽  
Double Layer Capacitor ◽  
Acid Washing ◽  
Chemical Vapor Depostion ◽  
High Specific Area

Carbon nanotubes (CNT) are a material with unique properties (mechanical, electrical, electrochemical, etc) allied with low density and high specific area. The present paper studied the electrochemical properties of carbon nanotubes growth by Chemical Vapor Depostion (CVD) technique. The samples were characterized by SEM, Raman Spectroscopy and the double layer capacitance of the powders was evaluated in a Teflon capacitor system with a Ag/AgCl (3M) as reference electrode. The catalyst remotion is provided in Hydrochloric acid washing and the wet oxidative treatments promotes the CNT oxidation and increase the pseudocapacitive response.

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