scholarly journals Nucleation and growth for magnesia inclusion in Fe–O–Mg melt

RSC Advances ◽  
2018 ◽  
Vol 8 (67) ◽  
pp. 38336-38345 ◽  
Author(s):  
Yuanyou Xiao ◽  
Hong Lei ◽  
Bin Yang ◽  
Guocheng Wang ◽  
Qi Wang ◽  
...  
Keyword(s):  
Crystallization Process ◽  
Nucleation And Growth ◽  
Mg Melt

The crystallization process of magnesia involves two steps.

Theoretical Study of Iron Heterogeneous Growth on the Surface of C60 Molecule

2014 ◽  
Vol 1081 ◽  
pp. 115-118
Author(s):  
Qi Cheng Liu ◽  
Yun Fang Li
Keyword(s):  
Crystallization Process ◽  
Theoretical Study ◽  
Covalent Bond ◽  
Md Simulations ◽  
Nucleation And Growth ◽  
Bond Forming ◽  
Regular Icosahedron ◽  
Molecule Dynamics ◽  
Molecule Surface ◽  
Regular Closed

Direct molecule dynamics (MD) simulations have also been performed to study heterogeneous nucleation and growth of iron on C60 molecule. The grown mechanism of this crystallization process was explored. The results indicate that 92 iron atoms attach to C60 molecule surface can form new covalent bond, forming a closed regular icosahedron. More atoms grow in layer to form bigger regular closed clathrate base on the structure of former one. As increase of atoms number, there will appear some crystal faces.

The Stimulated Crystallization of Amorphous SiO2 Films on Si Substrates Induced By Laser and Thermal Treatments

1988 ◽  
Vol 116 ◽  
Author(s):  
Felix Edelman
Keyword(s):  
Incubation Time ◽  
Crystallization Process ◽  
Laser Flash ◽  
Nucleation And Growth ◽  
Point Of View ◽  
Growth Theory ◽  
Thermal Treatments ◽  
Kinetic Characteristics ◽  
Amorphous Sio2 ◽  
Si Substrates

AbstractThe transformation of amorphous to crystal (a-c) structure of Si02 layers, thermally grown on both (100) and (111) Si substrates, was carried out by CO2 laser, flash-lamp, and furnace heat: treatments. All the treatments resulted in S102 crystallization according to two different mechanisms: normal and self-sustained growth processes. The kinetic characteristics of the S102 crystallization process such as incubation time, rates of nucleation and growth, and the microstructure of the Si-Si02 interface were investigated and are discussed from the point of view of growth theory. The a-c transformation in Si3N4 and SixOyNz films on Si substrates is also discussed.

Physical properties and microstructures of a BN-NiCoCrAlY laser amorphous-nanocrystal reinforced composite coating

2016 ◽  
Vol 23 (4) ◽  
pp. 461-465
Author(s):  
Jianing Li ◽  
Yuanbin Zhang ◽  
Hui Luo ◽  
Shuili Gong ◽  
Yushuang Huo
Keyword(s):  
Composite Coating ◽  
Molten Pool ◽  
Crystallization Process ◽  
Solidification Process ◽  
Nucleation And Growth ◽  
Rapid Solidification Process ◽  
Amorphous Phases ◽  
Reinforced Composite ◽  
Ta15 Alloy ◽  
Nanocrystalline Phases

AbstractAn amorphous-nanocrystal reinforced composite coating was fabricated on a TA15 alloy by laser cladding of BN-NiCoCrAlY mixed powders. Experimental results indicated that a portion of the amorphous phases just began to crystallize when the laser molten pool had completed the solidification process. The nucleation and growth of the amorphous phases were retarded by the nanocrystalline phases to a certain extent during the crystallization process. Due to the rapid solidification process of the laser molten pool, a number of the fine precipitates were produced. The production of eutectics, such as Co-Ti and Ti-Si compounds, in such a coating greatly promoted the formation of amorphous phases.

Effect of Kinetic Parameters on the Dynamicsof Continuous Crystallizers

1998 ◽  
Vol 63 (1) ◽  
pp. 121-131 ◽  
Author(s):  
Jaroslav Nývlt
Keyword(s):  
Steady State ◽  
Kinetic Parameters ◽  
Production Rate ◽  
Crystal Size ◽  
Crystallization Process ◽  
Dynamic Behaviour ◽  
Nucleation And Growth ◽  
Suspension Concentration ◽  
Run Time ◽  
Periodic Cycles

Continuous crystallizers can exhibit periodic cycles of supersaturation, production rate, suspension concentration, crystal size and related quantities. These cycles are most pronounced at the beginning of the crystallization process and depend on the value of kinetic parameters whether they are damped during the run time. Apparently, the cycling behaviour of the crystallizing system depends on the value of ratio of the nucleation and growth exponents n/g. The higher the value of this ratio, the more pronounced is the instability of the system. Admixtures that have a significant effect on the kinetic parameters can dramatically affect the dynamic behaviour of crystallizers so that the steady state may not be established at all.

scholarly journals Peculiarities of Protein Crystal Nucleation and Growth

Crystals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 422 ◽  
Author(s):  
Christo Nanev
Keyword(s):  
Crystallization Process ◽  
Protein Crystallization ◽  
Nucleation And Growth ◽  
Crystal Nucleation ◽  
Protein Crystal ◽  
Solution Flow ◽  
Molecular Scale ◽  
Novel Approaches ◽  
Lattice Formation ◽  
Complete Account

This paper reviews investigations on protein crystallization. It aims to present a comprehensive rather than complete account of recent studies and efforts to elucidate the most intimate mechanisms of protein crystal nucleation. It is emphasized that both physical and biochemical factors are at play during this process. Recently-discovered molecular scale pathways for protein crystal nucleation are considered first. The bond selection during protein crystal lattice formation, which is a typical biochemically-conditioned peculiarity of the crystallization process, is revisited. Novel approaches allow us to quantitatively describe some protein crystallization cases. Additional light is shed on the protein crystal nucleation in pores and crevices by employing the so-called EBDE method (equilibration between crystal bond and destructive energies). Also, protein crystal nucleation in solution flow is considered.

SIMULATION AND NEW SENSOR TECHNOLOGIES FOR INDUSTRIAL CRYSTALLIZATION: A REVIEW

2002 ◽  
Vol 16 (01n02) ◽  
pp. 346-353 ◽  
Author(s):  
RICHARD D. BRAATZ ◽  
MITSUKO FUJIWARA ◽  
DAVID L. MA ◽  
TIMOKLEIA TOGKALIDOU ◽  
DANESH K. TAFTI
Keyword(s):  
High Resolution ◽  
Size Distribution ◽  
Crystal Size ◽  
Crystallization Process ◽  
Significant Proportion ◽  
Nucleation And Growth ◽  
Crystalline Form ◽  
Industrial Crystallization ◽  
Growth From Solution ◽  
Product Effectiveness

A significant proportion of materials are produced in crystalline form. Many of these crystals are produced by nucleation and growth from solution. In these processes, the control of the crystal size distribution can be critically important for efficient downstream operations such as filtration and drying, and product effectiveness (e.g., flowability, bioavailability, tablet stability). Such control has recently become possible due to new sensor technologies that can peer into the crystallization process as it occurs, and high resolution algorithms which can efficiently simulate crystallization processes. This paper provides an overview of recent advances in areas.

Non-Isothermal Crystallization Behavior in Zr55Cu30Ni5Al10 Bulk Metallic Glass

2010 ◽  
Vol 146-147 ◽  
pp. 560-564 ◽  
Author(s):  
Ping Jun Tao ◽  
Yuan Zheng Yang ◽  
Xiao Jun Bai ◽  
Zhong Xin Mu ◽  
Guo Qing Li
Keyword(s):  
Amorphous Alloy ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
Nucleation And Growth ◽  
Bulk Amorphous Alloy ◽  
Copper Mold ◽  
Ozawa Method ◽  
Heating Rates ◽  
X Ray

A Zr55Cu30Ni5Al10 bulk amorphous alloy was prepared by using copper mold suction casting and the X-ray diffractometer (XRD) was utilized to determine its structure. The non-isothermal crystallization behavior of the amorphous alloy was studied via a differential scanning calorimeter (DSC) by Kissinger and Ozawa methods. The results showed that all the thermodynamic parameters move to higher temperatures with increasing heating rates. The activation energies for crystallization calculated by Kissinger and Ozawa method are 291.27 and 288.53 kJ/mol, respectively. With the increase of heating rate, the rate of x vs. T descends. The crystallization mechanism is typical nucleation and growth of crystalline grains, among which the latter dominates the total crystallization process.

Sign in / Sign up

Export Citation Format

Share Document