Sorption Properties of ZrO2-Analcime Composites in Relation to Cs(I) and Sr(II)

Composite zeolite sorbents based on analcime with inclusions of hydrated zirconium dioxide (ZrO2-analcime) have been obtained by hydrothermal treatment of coal fly ash cenospheres with a high glass phase content in the presence of a zirconium compound and an alkaline activating agent at 150 °C and different stirring modes of the reaction mixture. The synthesis products were characterized by XRD, SEM-EDS, STA and low-temperature nitrogen adsorption; their sorption properties with respect to Cs+ and Sr2+ were studied in the pH range of 2–10. It was found that the ZrO2-analcime compositions surpass unmodified analcime by 2–5 times in terms of sorption of Cs+ and Sr2+ and by two orders of magnitude in terms of the distribution coefficient value (KD ~106 ml/g). The process of high-temperature solid-phase transformation of Cs+/Sr2+-exchanged forms of the compositions was studied, which simulates the process of conversion of water-soluble forms of Cs‑137 and Sr‑90 radionuclides into a mineral-like form. It was shown that at 1000 °C the ZrO2-analcime compositions with sorbed Cs+ and Sr2+ undergo the phase transformation resulting in polyphase systems of similar composition based on nepheline, tetragonal ZrO2, and glass phase

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Heat capacities and enthalpies of fusion and transformation for solvates of some salts with dimethyl sulfoxide and dimethylformamide

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19883072 ◽

1988 ◽

Vol 53 (12) ◽

pp. 3072-3079

Author(s):

Mojmír Skokánek ◽

Ivo Sláma

Keyword(s):

Heat Capacity ◽

Phase Transformation ◽

Phase Transformations ◽

Dimethyl Sulfoxide ◽

Liquidus Temperature ◽

Molar Heat Capacity ◽

Solid Phase ◽

Zinc Nitrate ◽

Heat Capacities ◽

Liquid Phases

Molar heat capacities and molar enthalpies of fusion of the solvates Zn(NO3)2 . 2·24 DMSO, Zn(NO3)2 . 8·11 DMSO, Zn(NO3)2 . 6 DMSO, NaNO3 . 2·85 DMSO, and AgNO3 . DMF, where DMSO is dimethyl sulfoxide and DMF is dimethylformamide, have been determined over the temperature range 240 to 400 K. Endothermic peaks found for the zinc nitrate solvates below the liquidus temperature have been ascribed to solid phase transformations. The molar enthalpies of the solid phase transformations are close to 5 kJ mol-1 for all zinc nitrate solvates investigated. The dependence of the molar heat capacity on the temperature outside the phase transformation region can be described by a linear equation for both the solid and liquid phases.

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Structure and sorption properties of multifunctional acrylic polymers designed for solid phase microextraction fibers

Polymer ◽

10.1016/j.polymer.2020.122191 ◽

2020 ◽

Vol 190 ◽

pp. 122191

Author(s):

Iwona Jakubowska ◽

Stanisław Popiel ◽

Mateusz Szala ◽

Michał Czerwiński ◽

Maciej Chrunik ◽

...

Keyword(s):

Solid Phase Microextraction ◽

Solid Phase ◽

Sorption Properties ◽

Acrylic Polymers ◽

Structure And Sorption Properties

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Polymer Binders of Ceramic Nanoparticles for Precision Casting of Nickel-Based Superalloys

Nanomaterials ◽

10.3390/nano11071714 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1714

Author(s):

Paweł Wiśniewski

Keyword(s):

Solid Phase ◽

Average Particle Size ◽

Water Soluble ◽

Ethyl Silicate ◽

Average Particle ◽

Precision Casting ◽

Polymer Binders ◽

Initial Stage ◽

Nano Alumina ◽

Solid Phase Content

This study presents the general characteristics of binders used in precision casting of Nickel-based superalloys. Three groups of binders were described: resins, organic compounds, and materials containing nanoparticles in alcohol or aqueous systems. This study also includes literature reports on materials commonly used and those recently replaced by water-soluble binders, i.e., ethyl silicate (ES) and hydrolysed ethyl silicate (HES). The appearance of new and interesting solutions containing nano-alumina is described, as well as other solutions at the initial stage of scientific research, such as those containing biopolymers, biodegradable polycaprolactone (PCL), or modified starch. Special attention is paid to four binders containing nano-SiO2 intended for the first layers (Ludox AM, Ludox SK) and structural layers (EHT, Remasol) of shell moulds. Their morphology, viscosity, density, reactions, and electrokinetic potential were investigated. The binders were characterized by a high solid-phase content (>28%), viscosity, and density close to that of water (1–2 mPa·s) and good electrokinetic stability. The nanoparticles contained in the binders were approximately spherically shaped with an average particle size of 16–25 nm.

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Solution- and Solid-Phase Syntheses of Guanidine-Bridged, Water-Soluble Linkers for Multivalent Ligand Design

Organic Letters ◽

10.1021/ol049835v ◽

2004 ◽

Vol 6 (9) ◽

pp. 1377-1380 ◽

Cited By ~ 35

Author(s):

Zhongsheng Zhang ◽

Jason C. Pickens ◽

Wim G. J. Hol ◽

Erkang Fan

Keyword(s):

Solid Phase ◽

Ligand Design ◽

Water Soluble

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Solid-solid phase transformation of uniaxially oriented n-alkane crystals of high purity

Journal of Molecular Structure ◽

10.1016/0022-2860(95)08869-w ◽

1995 ◽

Vol 355 (1) ◽

pp. 95-104 ◽

Cited By ~ 14

Author(s):

Ryozo Kitamaru ◽

Fumitaka Horii ◽

Masaru Nakagawa ◽

Kanichiro Takamizawa ◽

Yoshiko Urabe ◽

...

Keyword(s):

Phase Transformation ◽

High Purity ◽

Solid Phase ◽

Solid Phase Transformation

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Heat-Induced Solid–Solid Phase Transformation of TKX-50

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.7b00086 ◽

2017 ◽

Vol 121 (15) ◽

pp. 8262-8271 ◽

Cited By ~ 18

Author(s):

Zhipeng Lu ◽

Xianggui Xue ◽

Liya Meng ◽

Qun Zeng ◽

Yu Chi ◽

...

Keyword(s):

Phase Transformation ◽

Solid Phase ◽

Solid Phase Transformation

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Dynamical simulations of an electronically induced solid-solid phase transformation in tungsten

Physical Review B ◽

10.1103/physrevb.92.134110 ◽

2015 ◽

Vol 92 (13) ◽

Cited By ~ 22

Author(s):

Samuel T. Murphy ◽

Szymon L. Daraszewicz ◽

Yvelin Giret ◽

Matthew Watkins ◽

Alexander L. Shluger ◽

...

Keyword(s):

Phase Transformation ◽

Solid Phase ◽

Dynamical Simulations ◽

Solid Phase Transformation

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Ammonia Leaching of Zinc from Low-grade Oxide Zinc Ores Using the Enhancement of the Microwave Irradiation

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2017-0055 ◽

2017 ◽

Vol 16 (3) ◽

Author(s):

Shiwei Li ◽

Haoyu Li ◽

Weiheng Chen ◽

Jinhui Peng ◽

Aiyuan Ma ◽

...

Keyword(s):

Phase Transformation ◽

Microwave Irradiation ◽

Solid Phase ◽

Ammonia Concentration ◽

Low Grade ◽

Leaching Rate ◽

Small Particles ◽

Mineral Phase ◽

Total Ammonia ◽

Ammonia Leaching

AbstractIrradiated roast treatment and the ammonia leaching processing were conducted to deal with the low-grade oxide zinc ores. The ZnCO3phase was hard to be attended, which was the reason for the low leaching rate of the complicated zinc ores. The mineral phase transformation of the ZnCO3phase was generated after the ores irradiated in the microwave at the temperature of 673 K. The irradiated ores generated more small particles, it was the reason that the leaching rate of the complicated zinc ores was increased. When the leaching processing of the irradiated roasted ores was conducted under the conditions of the total ammonia concentration of 6 mol/L, the liquid to solid phase ratio of 11:1, the leaching temperature of 298 K, the leaching time of 150 min and the stirring speed of 400 rpm, 88.3 % of zinc could be achieved, which was the maximum leaching rate of the irradiated ores.

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Commercially available color-catching sheets for magnetic textile solid phase extraction of water-soluble dyes

Measurement ◽

10.1016/j.measurement.2020.108877 ◽

2021 ◽

Vol 172 ◽

pp. 108877

Author(s):

Ivo Safarik ◽

Jitka Prochazkova ◽

Eva Baldikova ◽

Kristyna Pospiskova

Keyword(s):

Solid Phase Extraction ◽

Solid Phase ◽

Water Soluble ◽

Phase Extraction

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3D Printing of Dapagliflozin Containing Self-Nanoemulsifying Tablets: Formulation Design and In Vitro Characterization

Pharmaceutics ◽

10.3390/pharmaceutics13070993 ◽

2021 ◽

Vol 13 (7) ◽

pp. 993

Author(s):

Mohammed S. Algahtani ◽

Abdul Aleem Mohammed ◽

Javed Ahmad ◽

M. M. Abdullah ◽

Ehab Saleh

Keyword(s):

3D Printing ◽

Solid Phase ◽

Immediate Release ◽

Water Soluble ◽

Solid Matrix ◽

Water Soluble Drug ◽

Poorly Water Soluble ◽

3D Printing Technique ◽

Poorly Water Soluble Drug

The 3D printing techniques have been explored extensively in recent years for pharmaceutical manufacturing and drug delivery applications. The current investigation aims to explore 3D printing for the design and development of a nanomedicine-based oral solid dosage form of a poorly water-soluble drug. A self-nanoemulsifying tablet formulation of dapagliflozin propanediol monohydrate was developed utilizing the semisolid pressure-assisted microsyringe (PAM) extrusion-based 3D printing technique. The developed formulation system consists of two major components (liquid and solid phase), which include oils (caproyl 90, octanoic acid) and co-surfactant (PEG 400) as liquid phase while surfactant (poloxamer 188) and solid matrix (PEG 6000) as solid-phase excipients that ultimately self-nanoemulsify as a drug encapsulated nanoemulsion system on contact with aqueous phase/gastrointestinal fluid. The droplet size distribution of the generated nanoemulsion from a self-nanoemulsifying 3D printed tablet was observed to be 104.7 ± 3.36 nm with polydispersity index 0.063 ± 0.024. The FT-IR analysis of the printed tablet revealed that no drug-excipients interactions were observed. The DSC and X-RD analysis of the printed tablet revealed that the loaded drug is molecularly dispersed in the crystal lattice of the tablet solid matrix and remains solubilized in the liquid phase of the printed tablet. SEM image of the drug-loaded self-nanoemulsifying tablets revealed that dapagliflozin propanediol monohydrate was completely encapsulated in the solid matrix of the printed tablet, which was further confirmed by SEM-EDS analysis. The in vitro dissolution profile of dapagliflozin-loaded self-nanoemulsifying tablet revealed an immediate-release drug profile for all three sizes (8 mm, 10 mm, and 12 mm) tablets, exhibiting >75.0% drug release within 20 min. Thus, this study has emphasized the capability of the PAM-based 3D printing technique to print a self-nanoemulsifying tablet dosage form with an immediate-release drug profile for poorly water-soluble drug.

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