scholarly journals Mechanochemical Synthesis of BaTiO3 Powders and Evaluation of Their Acrylic Dispersions

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3275
Author(s):  
Sonia Kudłacik-Kramarczyk ◽  
Anna Drabczyk ◽  
Magdalena Głąb ◽  
Piotr Dulian ◽  
Rafał Bogucki ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Ethylene Glycol ◽  
Mechanochemical Synthesis ◽  
Xrd Analysis ◽  
Energy Storage And Conversion ◽  
Poly Ethylene Glycol ◽  
A Value ◽  
Inorganic Coatings ◽  
Ft Ir ◽  
Poly Ethylene

Barium titanate is a ferroelectric perovskite with unique electric properties; therefore, it is widely applied in the fabrication of inorganic coatings or thin films, capacitors, or in the production of devices for energy storage and conversion. This paper describes the mechanochemical synthesis of BaTiO3 from BaO and TiO2 using a ball mill. XRD analysis allowed concluding that barium titanate was formed after 90 min of mechanochemical grinding. It was also proved by spectroscopic analysis and the band corresponding to Ti–O vibrations on obtained Fourier Transform Infrared (FT-IR) spectra. The specific surface area of obtained powder was 25.275 m2/g. Next, formed perovskite was dispersed in an acrylic poly(ethylene glycol) (superabsorbent polymer suspension, SAP) suspension prepared using microwave radiation. Final suspensions differed in the concentration of SAP applied. It was proven that the increase of SAP concentration does not affect the acidity of the suspension, but it does increase its dynamic viscosity. A sample with 83 wt.% of SAP reached a value of approximately 140 mPa∙s. Dispersions with higher values of SAP mass fraction exhibited lower sedimentation rates. Molecules such as SAP may adsorb to the surface of particles and thus prevent their agglomeration and make them well monodispersed. Based on the performed experiments, it can be concluded that acrylic poly(ethylene glycol) suspension is a suitable fluid that may stabilize barium titanate dispersions.

scholarly journals Enhanced dispersion stability of gold nanoparticles by the physisorption of cyclic poly(ethylene glycol)

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yubo Wang ◽  
Jose Enrico Q. Quinsaat ◽  
Tomoko Ono ◽  
Masatoshi Maeki ◽  
Manabu Tokeshi ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Ethylene Glycol ◽  
Dispersion Stability ◽  
Chemical Inhomogeneity ◽  
Poly Ethylene Glycol ◽  
Alternative Approach ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Tumor Accumulation ◽  
Key Techniques

AbstractNano-sized metal particles are attracting much interest in industrial and biomedical applications due to the recent progress and development of nanotechnology, and the surface-modifications by appropriate polymers are key techniques to stably express their characteristics. Herein, we applied cyclic poly(ethylene glycol) (c-PEG), having no chemical inhomogeneity, to provide a polymer topology-dependent stabilization for the surface-modification of gold nanoparticles (AuNPs) through physisorption. By simply mixing c-PEG, but not linear counterparts, enables AuNPs to maintain dispersibility through freezing, lyophilization, or heating. Surprisingly, c-PEG endowed AuNPs with even better dispersion stability than thiolated PEG (HS–PEG–OMe). The stronger affinity of c-PEG was confirmed by DLS, ζ-potential, and FT-IR. Furthermore, the c-PEG system exhibited prolonged blood circulation and enhanced tumor accumulation in mice. Our data suggests that c-PEG induces physisorption on AuNPs, supplying sufficient stability toward bio-medical applications, and would be an alternative approach to the gold–sulfur chemisorption.

A novel polymer electrolyte based on oligo(ethylene glycol) 600, K2PdCl4, and K3Fe(CN)6

1997 ◽  
Vol 12 (12) ◽  
pp. 3393-3403 ◽  
Author(s):  
Vito Di Noto
Keyword(s):  
Ethylene Glycol ◽  
Analytical Data ◽  
Conductivity Measurements ◽  
Poly Ethylene Glycol ◽  
Ir Studies ◽  
Structure Morphology ◽  
Different Temperatures ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Peg 600

New electrolytic systems were prepared by reacting K3Fe(CN)6 and K2PdCl4 in a mixture of water and poly(ethylene glycol) 600 (PEG). The reaction occurs in two steps: first a gel is formed, which then shrinks, releasing the solvent. The product thus obtained has the consistency of a smooth, solid plastic paste and is very stable. The influence of the reaction mixture on the structure, morphology, and conductivity of the products was investigated carrying out three preparations (I, II, III) at increasing ratio PEG 600/H2O. By FT-IR studies and analytical data it was concluded that these materials are inorganic-organic networks containing CN bridges between Fe and Pd atoms and PEG 600 bridges between Pd atoms. Scanning electron microscopy studies revealed that the morphology of polymers I, II, and III is significantly influenced by the conditions of the synthesis. Conductivity measurements made at different temperatures showed that polymers I, II, and III conduct ionically. The conductivity of polymer I, which was synthesized with the highest water/PEG 600 ratio, is on the order of 1.4 · 10−3 Sycm at 25 °C.

scholarly journals Optimization of Polyarginine-Conjugated PEG Lipid Grafted Proliposome Formulation for Enhanced Cellular Association of a Protein Drug

Pharmaceutics ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 272 ◽  
Author(s):  
Amolnat Tunsirikongkon ◽  
Yong-Chul Pyo ◽  
Dong-Hyun Kim ◽  
Sang-Eun Lee ◽  
Jeong-Sook Park
Keyword(s):  
Ethylene Glycol ◽  
1H Nmr ◽  
Protein Drug ◽  
Poly Ethylene Glycol ◽  
Cellular Toxicity ◽  
Association Pattern ◽  
Ft Ir ◽  
Poly Ethylene

The purpose of this study was to develop an oral proliposomal powder of protein using poly-l-arginine-conjugated 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-poly(ethylene glycol) (DSPE-PEG) (PLD) for enhancing cellular association upon reconstitution and to compare its effects with a non-grafted and PEGylated formulation. Cationic proliposome (CATL), PLD-grafted CATL (PLD-CATL), PEGylated CATL (PEG CATL), and PLD grafted-PEG CATL (PLD-PEG CATL) were prepared and compared. Successful conjugation between poly-l-arginine and DSPE-PEG was confirmed by 1H NMR and FT-IR. PLD was successfully grafted onto the proliposomal powder during the slurry process. Although reconstituted liposomal sizes of CATL and PLD-CATL were increased by agglomeration, PEGylation reduced the agglomeration and increased the encapsulation. The viabilities of cells treated with both CATL and PLD-CATL formulations were low but increased following PEGylation. With regard to cellular association, PLD-CATL enhanced cellular association/uptake more rapidly than did CATL. Upon PEGylation, PEG CATL showed a lower level of cellular association/uptake compared with CATL while PLD-PEG CATL did not exhibit the rapid cellular association/uptake as seen with PLD-CATL. However, PLD-PEG CATL still enhanced the higher cellular association/uptake than PEG CATL did without PLD. In conclusion, proliposomes with PLD could accelerate cellular association/uptake but also caused high cellular toxicity. PEGylation reduced cellular toxicity and also changed the cellular association pattern of the PLD formulation.

scholarly journals Effect of Poly Ethylene Glycol on CuO Nanoparticles and its Antibacterial Application

2016 ◽  
Vol 63 ◽  
pp. 111-118 ◽  
Author(s):  
T. Hemalatha ◽  
S. Akilandeswari
Keyword(s):  
Ethylene Glycol ◽  
Quantum Confinement Effect ◽  
Antibacterial Properties ◽  
Cuo Nanoparticles ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Poly Ethylene Glycol ◽  
X Ray ◽  
Ft Ir ◽  
Poly Ethylene

Pure CuO nanoparticles and chemically-precipitated Poly Ethylene Glycol (PEG) used as a capping agent CuO nanocrystal continuum (0.1, 0.2, 0.3, 0.4, 0.5 gm) was anatomized for structural and morphological research using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Field - Emission Scanning Electron Microscopy (FE-SEM). Their X-ray Diffraction (XRD) analysis manifested monoclinic crystallinity in pure and PEG-capped CuO nanorods, with an average crystallite size of 21.63nm and 13-16nm respectively. The morphological analysis revealed their structural conformation. The FT-IR spectrum affirmed the presence of Cu-O bonds. The optical property of the aforesaid nanorods was studied by UV-Visible reflectance (UV-Vis DRS). The UV analysis showed that all the capped products show signs of good optical quality in the UV region and also the absorption edge was blue shifted with a band gap of 1.85 eV for 0.4gm PEG capped as results of quantum confinement effect. The antibacterial properties of the as-prepared nanostructures investigated for various human pathogens using disc diffusion method. The result showed the significant antibacterial activity bothgram positiveandgram negativebacteria.

Synthesis and characterization of methoxy poly(ethylene glycol)-b-poly(DL-lactide-co-glycolide-co-ε-caprolactone) di block copolymers: Effects of block lengths and compositions

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Yodthong Baimark ◽  
Mangkorn Srisa-ard ◽  
Jirasak Threeprom ◽  
Robert Molloy ◽  
Winita Punyodom
Keyword(s):  
Ethylene Glycol ◽  
Ring Opening ◽  
Diblock Copolymers ◽  
Poly Ethylene Glycol ◽  
H Nmr ◽  
Random Character ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Dsc Curves

AbstractMethoxy poly(ethylene glycol)-b-poly(D,L-lactide-co-glycolide-co-ε- caprolactone) diblock copolymers, designated as MPEG-b-PDLLGCL, with different MPEG block lengths and DLL:G:CL ratios were synthesized via ring-opening polymerization in bulk using MPEG and stannous octoate as the initiating system. The diblock copolymers were characterized using a combination of FT-IR, 1HNMR, GPC and DSC. The percentage yields of the diblock copolymers were in excess of 90%. 1H-NMR analysis confirmed that the PDLLGCL blocks contained at least some random character. From their DSC curves, the diblock copolymers were amorphous in morphology. Their glass transition temperatures decreased as the MPEG block length increased and as G and CL units were incorporated.

scholarly journals Crosslinking Dynamics and Gelation Characteristics of Photo- and Thermally Polymerized Poly(Ethylene Glycol) Hydrogels

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3277
Author(s):  
Jungmoon Sung ◽  
Dong Geun Lee ◽  
Sukchin Lee ◽  
Junyoung Park ◽  
Hyun Wook Jung
Keyword(s):  
Ethylene Glycol ◽  
Real Time ◽  
Irradiation Time ◽  
Surface Hardness ◽  
Thermal Polymerization ◽  
Poly Ethylene Glycol ◽  
Peg Hydrogels ◽  
The Real ◽  
Ft Ir ◽  
Poly Ethylene

The crosslinking behaviors and gelation features of poly(ethylene glycol) (PEG) hydrogels were scrutinized during the UV and thermal polymerizations of mixtures of poly(ethylene glycol) methacrylate (PEGMA, monomer) and poly(ethylene glycol) dimethacrylates (PEGDMAs, crosslinkers). The real-time crosslinking behavior of the PEG hydrogels was quantified as a function of the UV irradiation time and reaction temperature during the UV and thermal polymerization, respectively, using real-time FT-IR spectrometry and rotational rheometry. The gelation characteristics of UV- and thermally crosslinked hydrogels were compared through the analysis of the gel fraction, swelling ratio, surface hardness, and the loading and release of rhodamine-B. The gelation properties of the cured hydrogel films were suitably correlated with the real-time rheological properties and crosslinked network state of the PEG mixtures. The crosslinking and gelation properties of the cured hydrogels could be optimally tuned by not only the molecular weight of the crosslinker but also the UV or thermal polymerization conditions.

Understanding Thermal Behavior of Poly(ethylene glycol)-block-poly(N-isopropylacrylamide) Hydrogel Using Two-Dimensional Correlation Infrared Spectroscopy

2021 ◽  
pp. 000370282110066
Author(s):  
Yeonju Park ◽  
Minkyoung Kim ◽  
Isao Noda ◽  
Young Mee Jung
Keyword(s):  
Phase Transition ◽  
Ethylene Glycol ◽  
Heating Process ◽  
Two Dimensional ◽  
Poly Ethylene Glycol ◽  
Thermoresponsive Polymers ◽  
Heating And Cooling ◽  
Transition Mechanism ◽  
Ft Ir ◽  
Poly Ethylene

In this study, one of the thermoresponsive polymers, block copolymer consisting of poly(ethylene glycol) and poly( N-isopropylacylamide), was investigated using Fourier transform infrared (FT-IR) spectroscopy, principal component analysis (PCA), and two-dimensional correlation spectroscopy (2D-COS). The apparent trend of the spectral changes in the temperature-dependent FT-IR spectra of poly(ethylene glycol)- block-poly( N-isopropylacylamide) (PEG- b-PNiPAAm) hydrogel during the heating process looks similar to that during the cooling process. The results of the PCA and 2D-COS, however, clearly indicate an irreversible phase transition mechanism of PEG- b-PNiPAAm hydrogel during the heating and cooling processes. It has been also shown that PEG affects the phase transition mechanism of PEG- b-PNiPAAm hydrogel, especially during the heating process. Consequently, we can successfully determine the phase transition temperature and the mechanism of PEG- b-PNiPAAm hydrogel during the heating and cooling processes using PCA and 2D-COS, respectively.

Preparation and Characterization of Heat-Storage and Thermo Regulated Composite Material by Reaction Extrusion

2013 ◽  
Vol 821-822 ◽  
pp. 76-79
Author(s):  
Hong Zhang ◽  
Di Ke Sun ◽  
Hui Liu ◽  
Jing Guo ◽  
Yu Mei Gong
Keyword(s):  
Ethylene Glycol ◽  
Phase Change ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Extrusion Process ◽  
Poly Ethylene Glycol ◽  
Easy Method ◽  
Mean Body Temperature ◽  
Ft Ir ◽  
Poly Ethylene

Phase change materials exhibiting excellent heat storage property can be used for energy saving applications. The textile made by fiber with PCMs can provide human body a comfortable microenvironment. The heat-storage and thermo-regulated fiber with active poly (ethylene glycol) acrylate (PEGA) as phase change materials was prepared by reaction extrusion. Poly (ethylene glycol) acrylate was grafted to polypropylene (PP) during the extrusion process. Combining preparation with functionalization, this easy method makes the entire producing process more efficient and simple. We used nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FT-IR) to characterize the structure of PEGA and PP-g-PEGA, and the results proved the synthesis of graft copolymer. Differential scanning calorimeter (DSC) was used for characterizing functional fibers thermal property. The fiber with fixed enthalpy provided heat storage and themo-regulated property. The melting and crystalline latent heat of best sample is 6.83J/g and 1.32J/g, respectively. The crystalline temperature region is from 41.67°C to 34.23°C, which is close to mean body temperature and it shows great potential in functional textile.

Compatibility and Accelerated Degradation of L-Tyrosine Derived Biodegradable Polycarbonate/PEG Blends

2011 ◽  
Vol 675-677 ◽  
pp. 337-340
Author(s):  
Xia Huang ◽  
Jia Chang Chen ◽  
Chang Yu Shen ◽  
Qian Li ◽  
Chun Tai Liu ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Water Retention ◽  
Soft Segment ◽  
Sem Analysis ◽  
Solution Casting ◽  
Poly Ethylene Glycol ◽  
Accelerated Degradation ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Two Phases

In the present study, the compatibility and degradability of L-tyrosine derived polycarbonate(PC)/Poly(ethylene glycol) blend were investigated. The PC was synthesized in our laboratory. Blends of the polymers with compositions 95/5, 85/15, 75/25,50/50 and 25/75 w/w were prepared by solution-casting. The blends were characterized by FT-IR,DSC,XRD,SEM. No obvious two phases were observed. Analysis of water absorption revealed that the combination of PC and PEG improved the hydrophilicity of PC. DSC and SEM analysis implied that all those components in consideration were compatible well in the blend formulation systems.Tg of the blends decreased with increasing PEG content. With the increase of the soft segment PEG content, the water retention ratio increases from 37% to 83%.

Solvothermal Synthesis and Photocatalysis of SnO2 Nanocrystal Microspheres

2011 ◽  
Vol 412 ◽  
pp. 40-43 ◽  
Author(s):  
Hui Liu ◽  
Xiao Nan Dong ◽  
Guang Jun Li ◽  
Xiao Feng Wang ◽  
Zhen Feng Zhu
Keyword(s):  
Photocatalytic Activity ◽  
Ethylene Glycol ◽  
Rhodamine B ◽  
Solvothermal Synthesis ◽  
Degradation Rate ◽  
Photocatalytic Property ◽  
Poly Ethylene Glycol ◽  
Ft Ir ◽  
Poly Ethylene ◽  
High Degradation Rate

Quasi-monodispersed SnO2nanocrystal microspheres were successfully fabricated by a solvothermal route with the assistance of poly (ethylene glycol) (PEG, Mn=6000) template. The as-prepared SnO2microspheres were well characterized by XRD, SEM, TEM, and FT-IR. The photocatalytic activity for Rh B on the SnO2microspheres was also investigated under UV irradiation. The experimental results show that the quasi-monodispersed SnO2microspheres with diameter about 1.3µm are self-assembled by large quantity of crystallites less than 10 nm. The SnO2microspheres have a good photocatalytic property, as evidenced by the result that over 95% of the Rh B decomposed over the SnO2nanocrystal microspheres within 180 min. The high degradation rate of rhodamine B (Rh B) on the as-synthesized SnO2nanocrystal microspheres can be attributed to the small size of crystals.

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