Self-Assembly of Monodispersed Carnosine Spherical Crystals in a Reverse Antisolvent Crystallization Process

2019 ◽  
Vol 19 (5) ◽  
pp. 2695-2705 ◽  
Author(s):  
Yanan Zhou ◽  
Jingkang Wang ◽  
Ting Wang ◽  
Na Wang ◽  
Yan Xiao ◽  
...  
Keyword(s):  
Self Assembly ◽  
Crystallization Process ◽  
Antisolvent Crystallization ◽  
Spherical Crystals

Investigation of Agglomeration in the Presence of Oiling Out in the Antisolvent Crystallization Process

2021 ◽  
Author(s):  
Liping Wang ◽  
Ying Bao ◽  
Zhuang Sun ◽  
Valerie J. Pinfield ◽  
Qiuxiang Yin ◽  
...  
Keyword(s):  
Crystallization Process ◽  
Antisolvent Crystallization

scholarly journals Thermodynamic properties in ternary system of NH4HCO3–H2O–ethanol based on antisolvent method to strengthen crystallization of carbonized ammonia

2018 ◽  
Vol 37 (1-2) ◽  
pp. 127-138
Author(s):  
Yu Zhang ◽  
Dongdong Feng ◽  
Jianmin Gao ◽  
Qian Du ◽  
Shaohua Wu
Keyword(s):  
Energy Consumption ◽  
Thermodynamic Properties ◽  
Ternary System ◽  
Carbon Capture ◽  
Crystallization Process ◽  
Ammonium Bicarbonate ◽  
Renewable Energy Consumption ◽  
Capture Process ◽  
Antisolvent Crystallization ◽  
Main Component

One of the main challenges of the ammonia-based CO2 capture process is how to further reduce the regeneration energy consumption. An antisolvent crystallization method was proposed to strengthen the crystallization process of carbonized ammonia, and heating the crystal products instead of rich solution can greatly reduce renewable energy consumption. The main component of the crystal product was NH4HCO3 analyzed by X-ray diffraction. Therefore, it is very important to study the thermodynamic properties of ammonium bicarbonate in the ternary system of NH3–H2O–ethanol. In this paper, the solubility curves under different temperature and solvent compositions were determined by static method and the mathematical model of solubility was established. The effects of the addition of ammonium carbamate which was produced in the initial stage of the CO2 absorption process and the addition of ammonia on the solubility in ternary system of NH4HCO3–H2O–ethanol were studied. The dissolution heat was also calculated in the end. The research of this article has a guiding significance for the antisolvent method to strengthen the crystallization of carbonized ammonia of ammonia-based carbon capture technology. It is helpful to further strengthen the crystallization process of low carbonized ammonia and improve the crystallization yield.

Dissolution enhancement of Deflazacort using hollow crystals prepared by antisolvent crystallization process

2013 ◽  
Vol 49 (2) ◽  
pp. 294-301 ◽  
Author(s):  
A.S. Paulino ◽  
G. Rauber ◽  
C.E.M. Campos ◽  
M.H.P. Maurício ◽  
R.R. de Avillez ◽  
...  
Keyword(s):  
Crystallization Process ◽  
Dissolution Enhancement ◽  
Antisolvent Crystallization

scholarly journals Crystallize Nanoparticles by Precipitating Trace Polymeric Additives

2020 ◽  
Author(s):  
Yiwen Qian ◽  
Alessandra da Silva ◽  
Wolfgang Theis ◽  
Ting Xu ◽  
emmy yu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Crystallization Process ◽  
High Yield ◽  
Process Window ◽  
Patterned Surfaces ◽  
Dilute Solution ◽  
Cohesive Energy Density ◽  
Kinetic Growth ◽  
Multiple Length Scales ◽  
Polymeric Additives

<p>Growing nanoparticle (NP) crystals has been pursued extensively using ligand chemistries such as DNA and supramolecules, controlled evaporation and patterned surfaces. Here, we show that a trace amount of polymeric impurities (<0.1 wt.%) leads to reproducible, rapid growth of high quality 3-D NP crystals in solution and on patterned substrates with high yield. The polymers preferentially precipitate on the NP surfaces inducing the formation of small NP clusters, which subsequently act as nuclei to initiate NP crystal growth in dilute solution. This precipitation-induced NP crystallization process is applicable for a range of polymers and the resultant 3-D NP crystals can be tuned by varying polymeric additives loading, solvent evaporation rate and NP size. Fundamentally, the present study elucidates how to balance cohesive energy density and NP diffusivity in the self-assembly to favor nuclei formation energetically and kinetic growth in dilute solutions. The results shown also opened up the process window to rapidly and reliably fabricate NP crystals over multiple length scales. Furthermore, the amount of these impurities needed to grow NP crystals (<0.1 %) reminds us the need to pay special attention to fine details to interpret experimental observations in nanoscience.</p>

Self-Induced Nucleation During the Antisolvent Crystallization Process of Candesartan Cilexetil

2018 ◽  
Vol 18 (12) ◽  
pp. 7655-7662 ◽  
Author(s):  
Zhenguo Gao ◽  
Yang Wu ◽  
Yuanyi Wu ◽  
Junbo Gong ◽  
Ying Bao ◽  
...  
Keyword(s):  
Crystallization Process ◽  
Candesartan Cilexetil ◽  
Antisolvent Crystallization

Ultrastructure, chemical composition, and recrystallization of epicuticular waxes: transversely ridged rodlets

1999 ◽  
Vol 77 (5) ◽  
pp. 706-720 ◽  
Author(s):  
Iris Meusel ◽  
Christoph Neinhuis ◽  
Claus Markstädter ◽  
Wilhelm Barthlott
Keyword(s):  
Electron Microscopy ◽  
Chemical Composition ◽  
Self Assembly ◽  
Crystallization Process ◽  
Plant Cuticle ◽  
Epicuticular Waxes ◽  
Chemical Analyses ◽  
Similar Mode ◽  
Scanning Electron

Transversely ridged rodlets (Aristolochia-type) are of high systematic significance characterizing the ancestral Aristolochiales, Magnoliales, and Laurales. Sporadically, they also occur in various unrelated derived taxa. The ultrastructure, chemistry, and recrystallization of epicuticular waxes of nine species were investigated by high resolution scanning electron microscopy, gas chromatography, and mass spectrometry. Chemical analyses show that transversely ridged rodlets clearly differ in their composition. Waxes of one group are characterized by ketones, whereas a second group completely lacks ketones and is dominated by alkanes. Hentriacontan-16-one (palmitone) was found to be characteristic for transversely ridged rodlets of Aristolochia, Laurus, and Paeonia. Standard solutions were taken for recrystallization experiments under different conditions of solvent, crystallization velocity, and temperature. It was shown that transversely ridged rodlets or related crystals grow from total waxes of all species but never crystallize from individual compounds such as alkanes or palmitone. We concluded that transversely ridged crystals are formed by self-assembly based on a slow crystallization process and the presence of additives. This paper shows that transversely ridged rodlets occur convergently within angiosperms based on a similar mode of crystallization but a different chemical composition. The role of palmitone as a chemotaxonomic character of ancestral angiosperms is discussed.Key words: plant cuticle, epicuticular waxes, chemistry, ultrastructure, recrystallization, systematics.

scholarly journals Crystallize Nanoparticles by Precipitating Trace Polymeric Additives

2020 ◽  
Author(s):  
Yiwen Qian ◽  
Alessandra da Silva ◽  
Wolfgang Theis ◽  
Ting Xu ◽  
emmy yu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Crystallization Process ◽  
High Yield ◽  
Process Window ◽  
Patterned Surfaces ◽  
Dilute Solution ◽  
Cohesive Energy Density ◽  
Kinetic Growth ◽  
Multiple Length Scales ◽  
Polymeric Additives

<p>Growing nanoparticle (NP) crystals has been pursued extensively using ligand chemistries such as DNA and supramolecules, controlled evaporation and patterned surfaces. Here, we show that a trace amount of polymeric impurities (<0.1 wt.%) leads to reproducible, rapid growth of high quality 3-D NP crystals in solution and on patterned substrates with high yield. The polymers preferentially precipitate on the NP surfaces inducing the formation of small NP clusters, which subsequently act as nuclei to initiate NP crystal growth in dilute solution. This precipitation-induced NP crystallization process is applicable for a range of polymers and the resultant 3-D NP crystals can be tuned by varying polymeric additives loading, solvent evaporation rate and NP size. Fundamentally, the present study elucidates how to balance cohesive energy density and NP diffusivity in the self-assembly to favor nuclei formation energetically and kinetic growth in dilute solutions. The results shown also opened up the process window to rapidly and reliably fabricate NP crystals over multiple length scales. Furthermore, the amount of these impurities needed to grow NP crystals (<0.1 %) reminds us the need to pay special attention to fine details to interpret experimental observations in nanoscience.</p>

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