scholarly journals Multi-scale analysis of the impact of polylactide morphology on gas barrier properties

Polymer ◽  
2017 ◽  
Vol 108 ◽  
pp. 163-172 ◽  
Author(s):  
Samira Fernandes Nassar ◽  
Alain Guinault ◽  
Nicolas Delpouve ◽  
Véronique Divry ◽  
Violette Ducruet ◽  
...  
Keyword(s):  
Barrier Properties ◽  
Scale Analysis ◽  
Gas Barrier ◽  
Multi Scale ◽  
The Impact ◽  
Multi Scale Analysis ◽  
Gas Barrier Properties

The impact of microwave-assisted thermal sterilization on the morphology, free volume, and gas barrier properties of multilayer polymeric films

2014 ◽  
Vol 131 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sumeet Dhawan ◽  
Christopher Varney ◽  
Gustavo V. Barbosa-Cánovas ◽  
Juming Tang ◽  
Farida Selim ◽  
...  
Keyword(s):  
Free Volume ◽  
Barrier Properties ◽  
Polymeric Films ◽  
Gas Barrier ◽  
Microwave Assisted ◽  
Thermal Sterilization ◽  
The Impact ◽  
Gas Barrier Properties

Understanding the impact and adoption of conservation agriculture in Africa: A multi-scale analysis

2014 ◽  
Vol 187 ◽  
pp. 155-170 ◽  
Author(s):  
Marc Corbeels ◽  
Jan de Graaff ◽  
Tim Hycenth Ndah ◽  
Eric Penot ◽  
Frederic Baudron ◽  
...  
Keyword(s):  
Conservation Agriculture ◽  
Scale Analysis ◽  
Multi Scale ◽  
The Impact ◽  
Multi Scale Analysis

scholarly journals Multi-Scale Analysis of Integrated C1 (CH4 and CO2) Utilization Catalytic Processes: Impacts of Catalysts Characteristics up to Industrial-Scale Process Flowsheeting, Part I: Experimental Analysis of Catalytic Low-Pressure CO2 to Methanol Conversion

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 505 ◽  
Author(s):  
Hamid Reza Godini ◽  
Mohammadali Khadivi ◽  
Mohammadreza Azadi ◽  
Oliver Görke ◽  
Seyed Mahdi Jazayeri ◽  
...  
Keyword(s):  
Catalytic System ◽  
Low Pressure ◽  
Operating Conditions ◽  
Industrial Scale ◽  
Operating Pressure ◽  
Scale Analysis ◽  
Methanol Production ◽  
Multi Scale ◽  
The Impact ◽  
Multi Scale Analysis

A multi-aspect analysis of low-pressure catalytic hydrogenation of CO2 for methanol production is reported in the first part (part I) of this paper. This includes an extensive review of distinguished low-pressure catalytic CO2-hydrogenation systems. Specifically, the results of the conducted systematic experimental investigation on the impacts of synthesis and micro-scale characteristics of the selected Cu/ZnO/Al2O3 model-catalysts on their activity and stability are discussed. The performance of the investigated Cu/ZnO/Al2O3 catalysts, synthesized via different methods, were tested under a targeted range of operating conditions in this research. Specifically, the performances of these tested Cu/ZnO/Al2O3 catalysts with regard to the impacts of the main operating parameters, namely H2/CO2 ratio (at stoichiometric -3-, average -6- and high -9- ratios), temperature (in the range of 160–260 °C) and the lower and upper values of physically achievable gas hourly space velocity (GHSV) (corresponding to 200 h−1 and 684 h−1, respectively), were analyzed. It was found that the catalyst prepared by the hydrolysis co-precipitation method, with a homogenously distributed copper content over its entire surface, provides a promising methanol yield of 21% at a reaction temperature of 200 °C, lowest tested GHSV, highest tested H2/CO2 ratio (9) and operating pressure (10 bar). This is in line with other promising results so far reported for this catalytic system even in pilot-plant scale, highlighting its potential for large-scale methanol production. To analyze the findings in more details, the thermal-reaction performance of the system, specifically with regard to the impact of GHSV on the CO2-conversion and methanol selectivity, and yield were experimentally investigated. Moreover, the stability of the selected catalysts, as another crucial factor for potential industrial operation of this system, was tested under continual long-term operation for 150 h, the reaction-reductive shifting-atmospheres and also even after introducing oxygen to the catalyst surface followed by hydrogen reduction-reaction tests. Only the latter state was found to affect the stable performance of the screened catalysts in this research. In addition, the reported experimental reactor performances have been analyzed in the light of equilibrium-based calculated achievable performance of this reaction system. In the performed multi-scale analysis in this research, the requirements for establishing a selective-stable catalytic performance based on the catalyst- and reactor-scale analyses have been identified. This will be combined with the techno–economic performance analysis of the industrial-scale novel integrated process, utilizing the selected catalyst in this research, in the form of an add-on catalytic system under 10 bar pressure and H2/CO2 ratio (3), for efficiently reducing the overall CO2-emission from oxidative coupling of methane reactors, as reported in the second part (part II) of this paper.

Synthesis and Properties of a Novel Si-Ti Polymer/Montmorillonite Nanocomposites

2014 ◽  
Vol 636 ◽  
pp. 85-88
Author(s):  
Xin Hua Yuan ◽  
Li Yin Han ◽  
Qiu Su ◽  
Wen Hua Guo ◽  
Hong Xing Xu ◽  
...  
Keyword(s):  
Impact Strength ◽  
Raw Materials ◽  
Barrier Properties ◽  
Tetrabutyl Titanate ◽  
Gas Barrier ◽  
Impact Properties ◽  
Barrier Performance ◽  
The Impact ◽  
Gas Barrier Properties ◽  
Montmorillonite Nanocomposites

Using methyl triethoxysilane, tetrabutyl titanate and ethyl acetoacetate as raw materials, the Si-Ti polymer was synthesized to prepare Si-Ti polymer/montmorillonite nanocomposites. The effects of OMMT content on the impact properties and barrier performance of nanocomposites were investigated. The results show that with the increasing of OMMT content, the impact properties of nanocomposites are improved significantly. The impact strength of nanocomposite with 10wt% OMMT is about twice times than that without OMMT. The gas barrier properties of nanocomposites are also improved significantly. Compared with pure Si-Ti polymer, the water absorption of nanocomposite with 6wt% OMMT is decreased by 60.3%.

An Interactive Graph Partition Method Through Combination of Multi-scale Analysis and Level Set

2013 ◽  
Vol 34 (9) ◽  
pp. 2078-2084 ◽  
Author(s):  
Yun-fei Wang ◽  
Du-yan Bi ◽  
De-qin Shi ◽  
Tian-jun Huang ◽  
Di Liu
Keyword(s):  
Level Set ◽  
Graph Partition ◽  
Scale Analysis ◽  
Multi Scale ◽  
Partition Method ◽  
Multi Scale Analysis
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