Unique crystallization behavior in zeolite synthesis under external high pressures

2020 ◽  
Vol 56 (18) ◽  
pp. 2811-2814 ◽  
Author(s):  
Che Tan ◽  
Zhendong Liu ◽  
Yasuo Yonezawa ◽  
Sohei Sukenaga ◽  
Mariko Ando ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Crystallization Behavior ◽  
High Pressures ◽  
Zeolite Synthesis ◽  
Crystallization Behaviors ◽  
Autogenous Pressure

Hydrothermal synthesis of zeolites under external high pressures generates unique crystallization behaviors that are different from the synthesis under autogenous pressure.

Crystallization Behavior of Polypropylene/Syndiotactic1,2-Polybutadiene Blends

2012 ◽  
Vol 531-532 ◽  
pp. 182-185
Author(s):  
Xiao Feng He ◽  
Shuai Wang ◽  
Tie Jun Ge ◽  
Xue Quan Zhang ◽  
Chun Yu Zhang
Keyword(s):  
High Temperature ◽  
Melting Temperature ◽  
Crystallization Temperature ◽  
Crystallization Behavior ◽  
Strong Impact ◽  
Crystallization Behaviors ◽  
Supercooling Temperature ◽  
Melting And Crystallization

The melting and crystallization behaviors of Polypropylene/Syndiotactic1,2-polybutadiene (PP/s-PB) blends and neat PP were studied by using DSC, the results showed that the presence of s-PB in PP would have a strong impact on the crystallization capacity of PP. The presence of s-PB in PP could increase the crystallization temperature(Tc) of PP, and the s-PB could obviously lower supercooling temperature(Tm-Tc) of PP, but the s-PB in PP have a Slightly influence on the melting temperature(Tm) of PP. The proposed reason for those are that the crosslinking s-PB in high temperature is a nucleator for PP’s crystallization and increases PP’s crystalline rate. However, the s-PB lowers PP’s crystallinity. At the same time, the presence of PP in blends lowers s-PB’s crystallinity, but the PP in blends have a Slightly influence on the melting temperature(Tm) and crystallization temperature(Tc) of s-PB.

Crystallization behavior of functional polypropylene grafted graphene oxide nanocomposite

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65058-65067 ◽  
Author(s):  
Cai-Liang Zhang ◽  
Tao-Tao Wang ◽  
Xue-Ping Gu ◽  
Lian-Fang Feng
Keyword(s):  
Graphene Oxide ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
Crystallization Behaviors

With an aim to understand a role of grafted graphene oxide (GO) in crystallization process of polymer, isothermal and non-isothermal crystallization behaviors of a functional polypropylene grafted GO nanocomposite were investigated systematically.

Effects of Aspect Ratio of Carbon Nanotubes on Crystallization Behavior of Polylactide Composites

2013 ◽  
Vol 716 ◽  
pp. 25-29
Author(s):  
Zhao Hua Xu ◽  
Heng Li
Keyword(s):  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Multiwalled Carbon Nanotubes ◽  
Nucleation Rate ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Small Aspect Ratio ◽  
Multiwalled Carbon ◽  
Crystallization Behaviors ◽  
Aspect Ratios

Biodegradable polylactide (PLA) composites/pristine multiwalled carbon nanotubes (P-CNT) composites with three different aspect ratios (length to diameter) are prepared by coagulation method. Isothermal crystallization and morphology of neat PLA and its composites are further investigated to clarify the effects of aspect ratio of CNT on the crystallization behaviors of PLA in its composites. Results show that the different aspect ratio CNT exhibit substantially different effects on PLA crystallization. It is interesting to find that small aspect ratio CNT (CNT-S) greatly promotes nucleation rate than big aspect ratio CNT (CNT-L).

scholarly journals Tracking the crystallization behavior of high-silica FAU during AEI-type zeolite synthesis using acid treated FAU-type zeolite

RSC Advances ◽  
2021 ◽  
Vol 11 (37) ◽  
pp. 23082-23089
Author(s):  
Yuki Sada ◽  
Anand Chokkalingam ◽  
Kenta Iyoki ◽  
Masato Yoshioka ◽  
Tomoya Ishikawa ◽  
...  
Keyword(s):  
Crystallization Behavior ◽  
Zeolite Synthesis ◽  
Type Zeolite ◽  
High Silica ◽  
Zeolite P

A high-silica FAU was obtained during FAU-to-AEI interzeolite conversion using acid treated FAU.

Hydrothermal synthesis of single-crystalline mesoporous beta zeolite assisted by N-methyl-2-pyrrolidone

RSC Advances ◽  
2014 ◽  
Vol 4 (74) ◽  
pp. 39297-39300 ◽  
Author(s):  
Lijia Liu ◽  
Hongbin Wang ◽  
Runwei Wang ◽  
Shangjing Zeng ◽  
Ling Ni ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Low Cost ◽  
Beta Zeolite ◽  
Zeolite Synthesis ◽  
Synthesis System ◽  
Single Crystalline ◽  
Catalytic Activities ◽  
Novel Synthesis ◽  
System P

A novel synthesis of single-crystalline mesoporous beta zeolite with high catalytic activities by addition of low-cost N-methyl-2-pyrrolidone (NMP) into a conventional TEAOH-based zeolite synthesis system.

scholarly journals A Short Review on the Utilization of Incense Sticks Ash as an Emerging and Overlooked Material for the Synthesis of Zeolites

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1255
Author(s):  
Virendra Kumar Yadav ◽  
Nisha Choudhary ◽  
Vineet Tirth ◽  
Haresh Kalasariya ◽  
Govindhan Gnanamoorthy ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Solid Waste ◽  
Short Review ◽  
Water Bodies ◽  
Synthesis Methods ◽  
Zeolite Synthesis ◽  
Potential Candidate ◽  
Waste Products ◽  
Batch Operation

The traditional hydrothermal synthesis methods are mainly performed under batch operation, which generally takes few days to weeks to yield a zeolite with the desired properties and structure. The zeolites are the backbone of the petrochemical and wastewater industries due to their importance. The commercial methods for zeolite synthesis are expensive, laborious and energy intensive. Among waste products, incense sticks ash is a compound of aluminosilicates and could act as a potential candidate for the synthesis of zeolites for daily needs in these industries. Incense sticks ash is the byproduct of religious places and houses and is rich in Ca, Mg, Al and Si. As a result, incense sticks ash can be proven to be a potential candidate for the formation of calcium-rich zeolites. The formation of zeolites from incense sticks ash is an economical, reliable and eco-friendly method. The application of incense sticks ash for zeolite synthesis can also minimize the problem related to its disposal in the water bodies, which will also minimize the solid waste in countries where it is considered sacred and generated in tons every day.

A Comparison of Structures and Crystallization Behavior of Gels, Gel-Derived Classes and Conventional Glasses

1986 ◽  
Vol 73 ◽  
Author(s):  
Shyama P. Mukherjee
Keyword(s):  
Kinetic Parameters ◽  
Crystallization Behavior ◽  
Water Concentration ◽  
Processing Parameters ◽  
Activation Energies ◽  
Crystallization Behaviors ◽  
Gel Processing

ABSTRACTStudies on the structures and crystallization behavior of gels in TiO2, GeO2, SiO2-GeO2 and PbO-GeO2 systems are presented to analyze the differences in structures and crystallization behavior of gel-derived glasses and conventional glasses. The kinetic parameters for crystallization such as activation energies and frequency factors of gels, gel-derived glasses and conventional glasses in the GeO2-PbO system are presented to elucidate their difference in nucleation and crystallization behaviors. The influence of gel processing parameters such as pH and water concentration on the crystallization behavior of gels are discussed.

Crystallization sequence of an A1N-Y2O3-SiO2 glass-ceramic

1986 ◽  
Vol 44 ◽  
pp. 446-447
Author(s):  
T.R. Dinger ◽  
G. Thomas
Keyword(s):  
High Temperature ◽  
Glass Ceramic ◽  
Crystallization Behavior ◽  
High Stress ◽  
Crystallization Sequence ◽  
Sio2 Glass ◽  
Structural Applications ◽  
Ceramic Precursors

The use of Si3N4, alloys for high temperature, high stress structural applications has prompted numerous studies of the oxynitride glasses which exist as intergranular phases in their microstructures. Oxynitride glasses have been investigated recently in their bulk form in order to understand their crystallization behavior for subsequent Si3N4 applications and to investigate their worth as glass-ceramic precursors. This research investigates the crystallization sequence of a glass having a normalized composition of Y26Si30Al11 ON11 and lying in the A1N-Y2O3-SiO2 section of the Y-Si-Al-O-N system. Such glasses exist as intergranular phases in the technologically important Y2O3/Al2O3-fluxed Si3N4 alloys.

A first-principles Hartree-Fock description of MnO at high pressures

1998 ◽  
Vol 77 (4) ◽  
pp. 1063-1075
Author(s):  
W. C. Mackrodt, E.-A. Williamson, D. W
Keyword(s):  
First Principles ◽  
High Pressures ◽  
Hartree Fock
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