scholarly journals Inclusion Phenomena between theβ-Cyclodextrin Chiral Selector and Trp-D,L, and Its Use on the Assembly of Solid Membranes

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Hong Meng ◽  
Sumin Li ◽  
Ling Xiao ◽  
Chunxi Li
Keyword(s):  
Ionic Liquids ◽  
Separation Factor ◽  
Solution Method ◽  
Binding Capacity ◽  
Composite Membranes ◽  
X Ray Diffraction ◽  
Chiral Selectors ◽  
Chiral Ionic Liquids ◽  
Ft Ir ◽  
Inclusion Phenomena

The application ofβ-cyclodextrin (β-CD) and the chiral ionic liquids formed fromβ-cyclodextrin mono-6-deoxy-6-(3-methylimidazolium)-β-cyclodextrin tosylate (β-CD-IL) as chiral selectors is described. The inclusion phenomena between theβ-cyclodextrin chiral selectors and D,L-tryptophan (D,L-Trp) was studied. The inclusion compounds were prepared by grinding, and their properties analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance (NMR). The separation factor betweenβ-CD andβ-CD-IL with D,L-Trp was studied by the saturated solution method. This indicated a different binding capacity ofβ-CD andβ-CD-IL to the two enantiomers. This result shows that the chiral ionic liquids have a higher separation factor because of their high solubility. Theβ-cyclodextrin chiral ionic liquids and CS were cross-linked and immobilized on an N6 membrane to form composite membranes. Adsorption experiments and permeation experiments were carried out. 105.43 mg D,L-Trp/g membrane was obtained.

scholarly journals Influence of Ionic Liquids Assisted Synthesis on Morphology and Photocatalytic Properties of Bi4O5Br2

Proceedings ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 26
Author(s):  
Patrycja Wilczewska ◽  
Aleksandra Bielicka-Giełdoń ◽  
Agnieszka Fiszka Borzyszkowska ◽  
Aleksandra Pieczyńska ◽  
Ewa Maria Siedlecka
Keyword(s):  
Ionic Liquids ◽  
Photoelectron Spectroscopy ◽  
Photocatalytic Properties ◽  
X Ray Diffraction ◽  
Sem Images ◽  
New Thought ◽  
X Ray ◽  
Chromium Vi ◽  
Ft Ir ◽  
Adsorption Desorption

A series of Bi4O5Br2 photocatalysts were prepared via an innovation method of synthesis with ionic liquids (ILs). The crystal structures were investigated by X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). The Field Emission Scanning Electron Microscope (FE-SEM) images illustrated the unique structure of prepared photocatalysts. The photocatalysts were also characterized by N2 adsorption-desorption analysis, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (UV-vis/DRS) and photoluminescence spectra (PL). The role of ILs in synthesis of Bi4O5Br2 on morphology and photocatalytic properties were investigated. Rhodamine B, 5-fluorouracil and chromium (VI) were used as the model micropollutants to evaluated adsorption capacity, photooxidation and photoreduction ability of prepared Bi4O5Br2 under artificial solar light. This work provided a new thought for enhanced photocatalytic activity of bismuth oxybromide photocatalysts.

Dissolution and Regeneration of Reed Leaf Fibers in Imidazole-Based Ionic Liquids

2013 ◽  
Vol 652-654 ◽  
pp. 1539-1542
Author(s):  
Hou Jie Zhao ◽  
Chun Yan Wei ◽  
Yong Zhu Cui ◽  
Li Hua Lv ◽  
Xiao Wang
Keyword(s):  
Fourier Transform ◽  
Ionic Liquids ◽  
Infrared Spectroscopy ◽  
Chloride Solution ◽  
X Ray Diffraction ◽  
Cellulose I ◽  
X Ray ◽  
High Temperature And Pressure ◽  
Ft Ir ◽  
Temperature And Pressure

In this paper, regeneration of reed leaf fibers that have been degummed pretreatment in high temperature and pressure dissolved in 1-butyl-3-methylimidazolium chloride ionic liquids was studied. The samples containing 5% or 10%(wt/wt)reed leaf fibers in the ionic liquids, at 90°C for 7h.The dissolution process was viewed by polarizing microscope. Fourier-transform infrared spectroscopy(FT-IR) and X-ray diffraction were used to visualize the crystalline of reed leaf fiber transformed completely from cellulose I to cellulose Ⅱ after regenerated directly from 1-butyl-3-methylimidazolium chloride solution.

scholarly journals Gas Permeation Characteristics of TiO2-ZrO2-Aromatic Organic Chelating Ligand (aOCL) Composite Membranes

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 388
Author(s):  
Takashi Tachibana ◽  
Tomohisa Yoshioka ◽  
Keizo Nakagawa ◽  
Takuji Shintani ◽  
Eiji Kamio ◽  
...  
Keyword(s):  
Composite Membranes ◽  
Amorphous Structure ◽  
Gas Permeation ◽  
X Ray Diffraction ◽  
Aromatic Rings ◽  
Ethyl Ferulate ◽  
Ft Ir ◽  
Adsorption Desorption ◽  
Hydrolysis And Polycondensation ◽  
Residual Organic Matter

Methyl gallate (MG) and ethyl ferulate (EF) with a benzene ring were separately used as aromatic organic chelating ligands (aOCLs) to prepare two versions of TiO2-ZrO2-aOCL composite sols via hydrolysis and polycondensation reactions with titanium(IV) isopropoxide (Ti(OC3H7)4) and zirconium(IV) butoxide (Zr(OC4H9)4). Thermogravimetric and FT-IR analysis of dry gels revealed that aromatic rings were present in the residual organic matter when the gel was fired under nitrogen at 300 °C. In X-ray diffraction (XRD) measurements, the TiO2-ZrO2 composite material prepared using these two aOCLs showed an amorphous structure with no crystalline peaks for TiO2 and ZrO2. In N2 adsorption/desorption measurements at 77 K, the TiO2-ZrO2 samples using the aOCLs as a template appeared porous with a larger specific surface area than TiO2-ZrO2 without aOCL. TiO2-ZrO2-aOCL composite membranes were prepared by coating and firing TiO2-ZrO2-aOCL sol onto a SiO2 intermediate layer using an α-alumina porous tube as a substrate. Compared with the TiO2-ZrO2 membrane, the TiO2-ZrO2-aOCL membranes had higher gas permselectivity. The TiO2-ZrO2-EF membrane showed a He permeance of 2.69 × 10−6 mol m−2 s−1 Pa−1 with permeance ratios of He/N2 = 10.6 and He/CF4 = 163, while the TiO2-ZrO2-MG membrane revealed a bit less He permeance at 8.56 × 10−7 mol m−2 s−1 Pa−1 with greater permeance ratios of He/N2 = 61.7 and He/CF4 = 209 at 200 °C. A microporous TiO2-ZrO2 amorphous structure was obtained by introducing aOCL. The differences in the side chains of each aOCL could possibly account for the differences in the microporous structures of the resultant TiO2-ZrO2-aOCL membranes.

Design and Scalable Synthesis of New Chiral Selectors. Part 2: Chiral Ionic Liquids Derived from Diaminocyclohexane and Histidine

2011 ◽  
Vol 16 (2) ◽  
pp. 277-285 ◽  
Author(s):  
Viacheslav Zgonnik ◽  
Silvia Gonella ◽  
Marie-Rose Mazières ◽  
Frédéric Guillen ◽  
Gérard Coquerel ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Chiral Selectors ◽  
Chiral Ionic Liquids ◽  
Scalable Synthesis

scholarly journals Synthesis of pure potassium pentaborate (KB5) from potassium dihydrogen phosphate (KH2PO4) and colemanite

2021 ◽  
Author(s):  
Özlem Karagöz ◽  
Soner Kuşlu
Keyword(s):  
Solution Method ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Potassium Dihydrogen ◽  
Ft Ir ◽  
Lower Temperature ◽  
The Cost ◽  
Sem Analyses

Abstract In this study, after specifying theoretical reaction conditions required for chemical reaction, potassium pentaborate (KB5) was synthesized from the potassium dihydrogen phosphate (KH2PO4) solution and the raw colemanite (Ca2B6O11.5H2O) ore. The slow evaporation solution method was used at 25 ℃. The effect of time (6-18 hours) on crystallization was studied. Synthesized minerals were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), RAMAN spectroscopies, and scanning electron microscopy (SEM). The results according to the XRD, FT-IR, RAMAN, and SEM analyses proved that the synthesized product was the potassium pentaborate (KB5O8.4H2O) mineral having the ICSD: 96-026-1927 pdf code. As a result, the cost was reduced by using raw boron ore, colemanite and KB5 could be obtained in a shorter time and at a lower temperature.

Organocatalysis with Chiral Ionic Liquids

2014 ◽  
Vol 11 (2) ◽  
pp. 141-153 ◽  
Author(s):  
Karolina Zalewska ◽  
Luis C. Branco
Keyword(s):  
Ionic Liquids ◽  
Chiral Ionic Liquids

scholarly journals Polyurethane Composite Foams Synthesized Using Bio-Polyols and Cellulose Filler

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3474
Author(s):  
Katarzyna Uram ◽  
Milena Leszczyńska ◽  
Aleksander Prociak ◽  
Anna Czajka ◽  
Michał Gloc ◽  
...  
Keyword(s):  
Cross Sections ◽  
Raw Materials ◽  
Polyurethane Foams ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
Polyurethane Composite ◽  
Composite Foams ◽  
Closed Cell ◽  
Ft Ir ◽  
The Fourier Transform

Rigid polyurethane foams were obtained using two types of renewable raw materials: bio-polyols and a cellulose filler (ARBOCEL® P 4000 X, JRS Rettenmaier, Rosenberg, Germany). A polyurethane system containing 40 wt.% of rapeseed oil-based polyols was modified with the cellulose filler in amounts of 1, 2, and 3 php (per hundred polyols). The cellulose was incorporated into the polyol premix as filler dispersion in a petrochemical polyol made using calenders. The cellulose filler was examined in terms of the degree of crystallinity using the powder X-ray diffraction PXRD -and the presence of bonds by means of the fourier transform infrared spectroscopy FT-IR. It was found that the addition of the cellulose filler increased the number of cells in the foams in both cross-sections—parallel and perpendicular to the direction of the foam growth—while reducing the sizes of those cells. Additionally, the foams had closed cell contents of more than 90% and initial thermal conductivity coefficients of 24.8 mW/m∙K. The insulation materials were dimensionally stable, especially at temperatures close to 0 °C, which qualifies them for use as insulation at low temperatures.

scholarly journals Enhancement of Chloroprene/Natural/Butadiene Rubber Nanocomposite Properties Using Organoclays and Their Combination with Carbon Black as Fillers

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1085
Author(s):  
Patricia Castaño-Rivera ◽  
Isabel Calle-Holguín ◽  
Johanna Castaño ◽  
Gustavo Cabrera-Barjas ◽  
Karen Galvez-Garrido ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
High Performance ◽  
Rubber Matrix ◽  
Butadiene Rubber ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rubber Blends ◽  
Ft Ir ◽  
Chloroprene Rubber

Organoclay nanoparticles (Cloisite® C10A, Cloisite® C15) and their combination with carbon black (N330) were studied as fillers in chloroprene/natural/butadiene rubber blends to prepare nanocomposites. The effect of filler type and load on the physical mechanical properties of nanocomposites was determined and correlated with its structure, compatibility and cure properties using Fourier Transformed Infrared (FT-IR), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA) and rheometric analysis. Physical mechanical properties were improved by organoclays at 5–7 phr. Nanocomposites with organoclays exhibited a remarkable increase up to 46% in abrasion resistance. The improvement in properties was attributed to good organoclay dispersion in the rubber matrix and to the compatibility between them and the chloroprene rubber. Carbon black at a 40 phr load was not the optimal concentration to interact with organoclays. The present study confirmed that organoclays can be a reinforcing filler for high performance applications in rubber nanocomposites.

scholarly journals An accelerated and effective synthesis of zinc borate from zinc sulfate using sonochemistry

2020 ◽  
Vol 43 (1) ◽  
pp. 7-14
Author(s):  
Ali Can Ersan ◽  
Azmi Seyhun Kipcak ◽  
Meral Yildirim Ozen ◽  
Nurcan Tugrul
Keyword(s):  
Inorganic Compounds ◽  
Zinc Borate ◽  
High Yield ◽  
X Ray Diffraction ◽  
Ultrasonic Probe ◽  
Minimum Particle Size ◽  
Effective Synthesis ◽  
Ft Ir ◽  
Lower Temperature ◽  
Borate Compound

AbstractRecently, sonochemistry has been used for the synthesis of inorganic compounds, such as zinc borates. In this study using zinc sulphate heptahydrate (ZnSO4·7H2O) and boric acid (H3BO3) as starting materials, a zinc borate compound in the form of Zn3B6O12·3.5H2O was synthesized using an ultrasonic probe. Product’s characterization was carried out with using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR) and Raman spectroscopy. Zinc borate compound’s chemical bond structure was observed with Raman and FTIR. From the XRD results it was seen that Zn3B6O12·3.5H2O can be quickly synthesized upon heating at 80°C and 85°C (55 min) or 90°C (45 min) in very high yield (>90%). The minimum particle size obtained was ~143 μm from the SEM results. Zinc borate compound was synthesized at a lower temperature in less time than other synthesized zinc metal compound in literature.

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