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Crystals, Volume 10, Issue 4

April 2020 - 102 articles

Cover Story: Curcumin and its derivatives demethoxycurcumin (DMC) and bis(demethoxy)curcumin (BDMC) are natural ingredients of the plant rhizome of Curcuma longa L. Together they are known as curcuminoids. Despite their strong similarity in molecular structure, their pharmacological activity and therapeutic effects can differ, which requires isolation of curcumin in pure state. In the article, crystallization-based separation of curcumin from extract-similar curcuminoid mixtures is studied. Based on solubility and supersolubility data of pure curcumin and curcumin in the initial mixture, seeded cooling crystallization procedures were derived using different solvents/solvent systems. As a result, crystalline curcumin of up to 99.4% purity, free of BDMC and depleted DMC content, was provided in a simple single crystallization step. Opportunities to further enhance total curcumin recovery by optimizing the crystallization strategy are highlighted. View

Articles (102)

  • Feature Paper
  • Article
  • Open Access
60 Citations
5,104 Views
14 Pages

Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

  • Werner Skrotzki,
  • Aurimas Pukenas,
  • Eva Odor,
  • Bertalan Joni,
  • Tamas Ungar,
  • Bernhard Völker,
  • Anton Hohenwarter,
  • Reinhard Pippan and
  • Easo P. George

24 April 2020

The equiatomic face-centered cubic high-entropy alloy CrMnFeCoNi was severely deformed at room and liquid nitrogen temperature by high-pressure torsion up to shear strains of about 170. Its microstructure was analyzed by X-ray line profile analysis a...

  • Article
  • Open Access
3 Citations
2,816 Views
13 Pages

24 April 2020

To improve the chloride diffusion resistance and durability of concrete, a new kind of steel fiber reinforced MgO concrete (SFRMC) was made by adding steel fiber and MgO to concrete simultaneously. With steel fiber for load bearing and expansion limi...

  • Article
  • Open Access
28 Citations
5,365 Views
14 Pages

Analytical Modeling of Residual Stress in Laser Powder Bed Fusion Considering Part’s Boundary Condition

  • Elham Mirkoohi,
  • Hong-Chuong Tran,
  • Yu-Lung Lo,
  • You-Cheng Chang,
  • Hung-Yu Lin and
  • Steven Y. Liang

24 April 2020

Rapid and accurate prediction of residual stress in metal additive manufacturing processes is of great importance to guarantee the quality of the fabricated part to be used in a mission-critical application in the aerospace, automotive, and medical i...

  • Article
  • Open Access
5 Citations
4,386 Views
11 Pages

Fabrication of CoFe2O4 Nanowire Using a Double-Pass Porous Alumina Template with a Large Range of Pore Diameters

  • Wei Chen,
  • Hui Zheng,
  • Dongping Hu,
  • Qiong Wu,
  • Peng Zheng,
  • Liang Zheng and
  • Yang Zhang

23 April 2020

In this work, CoFe2O4 nanowire was fabricated by using a self-designed double-pass porous alumina template. The double-pass porous alumina template was prepared by a two-step oxidation method using a mixed acid (phosphoric acid and oxalic acid) elect...

  • Article
  • Open Access
12 Citations
4,667 Views
14 Pages

23 April 2020

Advanced materials with high strength are in great demand for structural applications, such as in aerospace. It has been proved that fabrication strategy plays a vital role in producing composites to satisfy these needs. This study explores new strat...

  • Article
  • Open Access
14 Citations
7,152 Views
11 Pages

23 April 2020

A new synthetic urine was adopted in this work to study the nucleation kinetics of calcium oxalate using a batch crystallizer for various supersaturations at 37 °C. In the studied new synthetic urine, three additional components (urea, uric acid and...

  • Article
  • Open Access
3 Citations
4,136 Views
16 Pages

Synergetic Effect of Calcium Doping on Catalytic Activity of Manganese Ferrite: DFT Study and Oxidation of Hydrocarbon

  • Zahoor Iqbal,
  • Saima Sadiq,
  • Muhammad Sadiq,
  • Muhammad Ali,
  • Khalid Saeed,
  • Najeeb Ur Rehman,
  • Mohammad Ilyas,
  • Saif Ullah,
  • Saeed Ullah Jan and
  • Iftikhar Ahmad
  • + 1 author

23 April 2020

Manganese ferrite (MnFe2O4) and calcium-doped manganese ferrite (Ca-MnFe2O4) were synthesized, characterized, and tested for oxidation of hydrocarbons (CH) in a self-designed gas blow rotating (GBR) reactor. The uniformly sized and thermally stable M...

  • Article
  • Open Access
29 Citations
4,940 Views
14 Pages

23 April 2020

To identify the effects of halogen bonding in the architecture of Schiff base complex supramolecular networks, we introduced halogenated Schiff-base 3-Br-5-Cl-salen as ligand and isolated a new salen-type manganese(III) complex [MnIII(Cl)(H2O)(3-Br-5...

  • Article
  • Open Access
5 Citations
4,794 Views
21 Pages

Structural Dynamics of An ELM-11 Framework Transformation Accompanied with Double-Step CO2 Gate sorption: An NMR Spin Relaxation Study

  • Kazuki Ohazama,
  • Takahiro Ueda,
  • Kazuki Ukai,
  • Manami Ichikawa,
  • Hyuma Masu,
  • Hiroshi Kajiro and
  • Hirofumi Kanoh

22 April 2020

[Cu(4,4'-bipyridine)2(BF4)2] (ELM-11), an elastic layer-structured MOF (metal-organic framework), is expected to be a sophisticated CO2 reservoir candidate because of its high capacity and recovery efficiency for CO2 sorption. While ELM-11 shows a un...

  • Article
  • Open Access
15 Citations
12,548 Views
14 Pages

22 April 2020

Surface property is an important factor that is widely considered in crystal growth and design. It is also found to play a critical role in changing the constitutive law seen in the classical elasticity theory for nanomaterials. Through molecular sta...

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Crystals - ISSN 2073-4352