Efficient and controllable synthesis of highly substituted gelatin methacrylamide for mechanically stiff hydrogels

RSC Advances ◽  
2015 ◽  
Vol 5 (128) ◽  
pp. 106094-106097 ◽  
Author(s):  
Bae Hoon Lee ◽  
Hitomi Shirahama ◽  
Nam-Joon Cho ◽  
Lay Poh Tan
Keyword(s):  
Synthesis Method ◽  
Controllable Synthesis ◽  
Ph Adjustment

An efficient and controllable synthesis method for gelatin methacrylamide is described. By sequential loading of methacrylic anhydride (MAA) after pH adjustment in an alkaline buffer, nearly complete substitution is achieved with small use of MAA.

CeO2 Nanocrystal Decorated TiO2 Nanobelt with Enhanced Photocatalytic Performance

2021 ◽  
Vol 21 (4) ◽  
pp. 2647-2652
Author(s):  
Yanchen Ji ◽  
Guoxin Song ◽  
Ruiqi Yang ◽  
Longhua Ding ◽  
Aizhu Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Treatment ◽  
Light Absorption ◽  
High Performance ◽  
Photocatalytic Performance ◽  
Synthesis Method ◽  
Charge Carriers ◽  
Controllable Synthesis ◽  
Visible Light Absorption ◽  
Potential Applications

In this work, CeO2 nanocrystal-decorated TiO2 nanobelt for forming a CeO2@TiO2 heterostructure. CeO2 plays a dual role in improving photocatalytic activity, not only by promoting the separation and transfer of photogenerated charge carriers, but also by increasing visible light absorption of the photocatalyst as a photosensitizer. The as-prepared CeO2@TiO2 heterostructure demonstrates the performance of organic degradation and H2 production (about 17 μmol/h/g, which is about 2.5 times higher than that of pure TiO2 nanobelts). Our work provides a facile and controllable synthesis method for high performance photocatalyst, which will have potential applications in synthesis clean/solar fuel, and photocatalytic water treatment.

Controllable synthesis of Au nanocrystals with systematic shape evolution from an octahedron to a truncated ditetragonal prism and rhombic dodecahedron

CrystEngComm ◽  
2019 ◽  
Vol 21 (37) ◽  
pp. 5602-5609 ◽  
Author(s):  
Yazhou Qin ◽  
Yuxiang Lu ◽  
Dongdong Yu ◽  
Jianguang Zhou
Keyword(s):  
Synthesis Method ◽  
Polyol Synthesis ◽  
Shape Evolution ◽  
Controllable Synthesis ◽  
Rhombic Dodecahedron ◽  
Stepwise Evolution

Stepwise evolution of Au nanocrystals from an octahedron to a truncated ditetragonal prism and rhombic dodecahedron was achieved by the polyol synthesis method.

Controllable Synthesis of Silver Nanoparticles Using Piezoelectric-Actuated High-Frequency Vibration Self-Circulating Microfluidic Reactor

NANO ◽  
2019 ◽  
Vol 14 (08) ◽  
pp. 1950097 ◽  
Author(s):  
Guojun Liu ◽  
Fang He ◽  
Yan Li ◽  
Xinbo Li ◽  
Hong Zhao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
High Frequency ◽  
Synthesis Method ◽  
Driving Voltage ◽  
Controllable Synthesis ◽  
Synthesis Mechanism ◽  
Growth Environment ◽  
High Frequency Vibration ◽  
Microfluidic Reactor ◽  
Transmission Electron

Based on the liquid-phase reduction mechanism, a controllable synthesis method, which uses piezoelectric-actuated high-frequency vibration self-circulating microfluidic reactor, to prepare silver nanoparticles is proposed. Firstly, the synthesis mechanism of silver nanoparticles and the working principle of the microfluidic reactor were analyzed. Then, in order to study and explore the influence of self-circulating and high frequency vibration on the synthesis of silver nanoparticles, a series of related synthesis experiments were carried out. The synthesized silver nanoparticles were characterized by UV-Visible spectroscopy and transmission electron microscopy. The effects of micropump driving voltage and high-frequency vibration on the synthesis of silver nanoparticles were analyzed. The experiment results show that when the silver nanoparticles were synthesized using piezoelectric-actuated high-frequency vibration self-circulating microfluidic reactor, the higher the driving voltage of the circulating reflux micropump, the faster the vortex rotation speed in the mixing pool and the more uniform the reagent reaction. Besides, high-frequency vibration can suppress the aggregation of silver nanoparticles, and balance the growth environment of particles, which is beneficial to the formation of silver nanoparticles with good monodispersity, high sphericity and small size deviation.

scholarly journals Controllable Synthesis of Silver Nanoparticles Using Three-Phase Flow Pulsating Mixing Microfluidic Chip

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Guojun Liu ◽  
Xiang Ma ◽  
Xiaodong Sun ◽  
Yanhui Jia ◽  
Tengfei Wang
Keyword(s):  
Silver Nitrate ◽  
Microfluidic Chip ◽  
Concentration Ratio ◽  
Synthesis Method ◽  
Synthesis Temperature ◽  
Controllable Synthesis ◽  
Experimental Conditions ◽  
Three Phase ◽  
Inlet Flow Rate ◽  
Three Phase Flow

On the basis of liquid-phase reduction mechanism, a novel synthesis method to prepare silver nanoparticles (AgNPs) is proposed, which uses piezoelectric-actuated three-phase flow pulsating mixing microfluidic chip. In order to study and explore the influence of different factors on the synthesis of AgNPs, a series of related synthesis experiments were carried out. The corresponding experimental conditions include the concentration of sodium hydroxide and reducing agent solution, polyvinylpyrrolidone (PVP) dosage, inlet flow rate, and synthesis temperature. The synthesized AgNPs were characterized by the UV-Vis absorption spectrophotometer and transmission electron microscopy. The effects of different experimental conditions on the controllable synthesis of AgNPs were analyzed, and the optimum synthesis conditions of AgNPs were obtained. Experimental results show that the spherical AgNPs with an average particle diameter of about 29 nm, high yield, fine morphology, and good monodispersity were synthesized using the microfluidic chip under the conditions of the working frequency (200 Hz), the initial concentration of silver nitrate (1 mM), the synthesis temperature (80°C), the concentration ratio of sodium hydroxide to silver nitrate (2 : 1), the concentration ratio of glucose to silver nitrate (4 : 1), the inlet flow rate (3.5 ml/min), and the quality ratio of PVP to silver (more than 1 : 1). The related research shows that it is an efficient synthesis method to develop the controllable synthesis experiments of AgNPs under multifactors using the three-phase pulsating mixing microfluidic chip.

Obtainment of α-Tricalcium Phosphate by Solution Combustion Synthesis Method Using Urea as Combustible

2008 ◽  
Vol 396-398 ◽  
pp. 591-594 ◽  
Author(s):  
Tiago M. Volkmer ◽  
L.L. Bastos ◽  
V.C. Sousa ◽  
L.A. Santos
Keyword(s):  
Heat Treatment ◽  
Combustion Synthesis ◽  
Tricalcium Phosphate ◽  
Synthesis Method ◽  
Solution Combustion Synthesis ◽  
Stoichiometric Ratio ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
Ph Adjustment ◽  
X Ray

The aim of this work is the synthesis of α-tricalcium phosphate by solution combustion synthesis using urea as combustible in the stoichiometric ratio and with excess of combustible. The salts Ca(O3)2.4H2O and (H4)2HPO4 were used as reaction precursors with Ca/P ratio of 1.5. The pH adjustment was made adding nitric acid. A porous foam composed by β-tricalcium phosphate, hydroxyapatite and α or β-dicalcium pyrophosphate were obtained as reaction product. X-ray diffraction was used to identify the phases. The obtainment of α-TCP was possible after a heat treatment where the material was held at 1250°C for 15 hours followed by quenching. Smaller particle size was obtained when four times the stoichiometric ratio of combustible was used in the reaction. α-TCP samples were immersed in SBF in order to verify the biocompatibility.

Structural design considerations of solution-processable graphenes as interfacial materials via a controllable synthesis method for the achievement of highly efficient, stable, and printable planar perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 890-900 ◽  
Author(s):  
Jun-Seok Yeo ◽  
You-Hyun Seo ◽  
Chan-Hee Jung ◽  
Seok-In Na
Keyword(s):  
Solar Cells ◽  
Structural Design ◽  
Perovskite Solar Cells ◽  
Synthesis Method ◽  
Hybrid Structure ◽  
Controllable Synthesis ◽  
Design Considerations ◽  
Highly Efficient ◽  
Solution Processable

A polymer–graphene hybrid structure with a controllable synthesis method successfully demonstrates the achievement of efficient, stable, and printable PeSCs.

Controllable Synthesis of Silver Nanoparticles Using a Double-Layer Y-Shaped SAR Micromixer

NANO ◽  
2020 ◽  
Vol 15 (05) ◽  
pp. 2050068
Author(s):  
Guojun Liu ◽  
Zhiqiang Li ◽  
Xinbo Li ◽  
Yanru Luo ◽  
Xinfeng Wang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Size Distribution ◽  
Double Layer ◽  
Flow Rate ◽  
Synthesis Method ◽  
Mixing Efficiency ◽  
Controllable Synthesis ◽  
Inlet Flow ◽  
Mixing Performance ◽  
Inlet Flow Rate

Based on the advantages of microfluidics in the field of nanoparticle synthesis, a controllable synthesis method for silver nanoparticles using a double-layer Y-shaped splitting and recombination (SAR) micromixer is proposed. First, the liquid phase synthesis mechanism of silver nanoparticles, the working principle of the double-layer Y-shaped SAR micromixer, and the mixing performance of micromixer at different Reynolds number (Re) are analyzed. Then, the micromixer is used to synthesize silver nanoparticles, and the effects of reductant concentration, polyvinylpyrrolidone (PVP) and inlet flow rate on the size, distribution and morphology of the synthesized silver nanoparticles are investigated comprehensively. The synthesized silver nanoparticles are characterized by UV-spectrometer and transmission electron microscopy (TEM). The experimental results show that the reductant concentration, PVP, and inlet flow rate have a direct impact on the size, distribution, monodispersity and morphology of the synthesized nanoparticles. The moderate reductant concentration makes the size of silver nanoparticles larger and the size uniformity is better. Adding PVP to the experimental reagent can prevent the aggregation of silver nanoparticles, consequently, the synthesized particles have a uniform distribution and a better morphology. The changes in inlet flow rate and Re directly affect the mixing efficiency, which in turn affect the formation of silver atoms and silver nanocrystal nuclei and have a greater impact on particle concentration. The proposed micromixer has excellent mixing performance and can be used in other fields such as controllable synthesis, biomedicine and microchemical systems.

Instant 99mTc Compounds

1971 ◽  
Vol 10 (03) ◽  
pp. 245-251 ◽  
Author(s):  
P. Richards ◽  
W. C. Eckelman
Keyword(s):  
Physical Properties ◽  
High Purity ◽  
Analytical Techniques ◽  
Full Potential ◽  
Labeled Compounds ◽  
Ph Adjustment ◽  
One Step ◽  
Stannous Ion ◽  
99Mtc Radiopharmaceuticals ◽  
Potential Use

SummaryThe full potential use of technetium has not been achieved despite its ideal physical properties, dosimetry and availability because of the complex preparations required for 99mTc radiopharmaceuticals. One of the goals of our work is to develop techniques for the preparation of high-purity 99mTc compounds which can be easily prepared, ideally by adding pertechnetate to a prepared solution.The use of stannous ion as reducing agent for technetium makes it possible to obtain such one-step, high-purity products. All non-radioactive components can be premixed in a single vial before addition of the radioactive pertechnetate. No final pH adjustment, further chemical manipulation or purification is required.Procedures for two instantly labeled compounds have been developed to date: 99mTc DTPA and 99mTc HSA. The 99mTc DTPA is prepared by adding pertechnetate to a previously prepared solution of stannous ion and CaNa3 DTPA which has been stored at pH 4. The 99mTc HSA is prepared by adding pertechnetate to a solution of stannous ion and HSA. The parametric variations and analytical techniques involved in formulating these procedures are described. It appears that development of kits for other biologically interesting compounds may be possible using similar procedures.

Instant 99mTc-Labelled Glucoheptonate Kit for Kidney Imaging

1983 ◽  
Vol 22 (05) ◽  
pp. 246-250 ◽  
Author(s):  
M. Al-Hilli ◽  
H. M. A. Karim ◽  
M. H. S. Al-Hissoni ◽  
M. N. Jassim ◽  
N. H. Agha
Keyword(s):  
Sodium Hydroxide Solution ◽  
Normal Subjects ◽  
Organ Distribution ◽  
Stable Complex ◽  
Scintillation Camera ◽  
Ph Adjustment ◽  
The Mean ◽  
The Stability ◽  
Kidney Imaging ◽  
Mean Concentration

Gelchromatography column scanning has been used to study the fractions of reduced hydrolyzed 99mTc, 99mTc-pertechnetate and 99mTc-chelate in a 99mTc-glucoheptonate (GH) preparation. A stable high labelling yield of 99mTc-GH complex in the radiopharmaceutical has been obtained with a concentration of 40-50 mg of glucoheptonic acid-calcium salt and not less than 0.45 mg of SnCl2 2 H2O at an optimal pH between 6.5 and 7.0. The stability of the complex has been found significantly affected when sodium hydroxide solution was used for the pH adjustment. However, an alternative procedure for final pH adjustment of the preparation has been investigated providing a stable complex for the usual period of time prior to the injection. The organ distribution and the blood clearance data of 99mTc-GH in rabbits were relatively similar to those reported earlier. The mean concentration of the radiopharmaceutical in both kidneys has been studied in normal subjects for one hour with a scintillation camera and the results were satisfactory.

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