Synthesis and Characterization of Poly(2-acrylamido-2-methyl propyl sulfonic acid-co-2-hydroxyethyl methclate)/ Silver Nanoparticle Composite Hydrogel as Catalysts for the Reduction of 4-Nitrophenol

2014 ◽  
Vol 809-810 ◽  
pp. 59-66
Author(s):  
Yun Long Li ◽  
Bin Huang Liu ◽  
Song Bai Lin
Keyword(s):  
Sulfonic Acid ◽  
Reduction Method ◽  
Catalytic Properties ◽  
Reduction Reaction ◽  
Composite Hydrogel ◽  
Synthesis And Characterization ◽  
In Situ Reduction ◽  
End Group

A novel kind of AgNPs catalyst was synthesized by in-situ reduction method using poly(2-acrylamido-2-methyl propyl sulfonic acid-co-2-hydroxyethyl methclate) [short as P(AMPS-co-HEMA)] hydrogel as matrices and AgNO3as a metal precursor. The structure of the composite hydrogel was characterized by Scan Electrical Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The results showed that AgNPs were binded with end group and most of the particles were isolated and uniformly distributed on the P(AMPS-co-HEMA). The catalytic properties in the reduction reaction of 4-nitrophenol(shorted as 4-NP) to 4-aminophenol(shorted as 4-AP) were studied in detail, and the result showed that conversion rate and conversion efficiency attained 97.56% and 0.9671 mmol/g·min when the amount of AgNPs was 9mg, [NaBH4] was 2.0×10−1mol/L, [4-NP] was 2.0×10−2mol/L and the total volume of solution was 50 mL, respectively.

Synthesis and Characterization of P (AAEA-Co-Aa)-PVP-PEG/Gold Nanoparticle Composite Hydrogel with Pore and Semi-Interpenetration Structure

2013 ◽  
Vol 834-836 ◽  
pp. 90-95
Author(s):  
Kun Lu Li ◽  
Song Bai Lin ◽  
Ru Pan Chen ◽  
Yun Long Li ◽  
Da Gang Li
Keyword(s):  
Gold Nanoparticle ◽  
Reduction Reaction ◽  
Composite Hydrogel ◽  
Solution Polymerization ◽  
In Situ Reduction ◽  
Interpenetrating Network ◽  
Foaming Agent ◽  
Swelling Equilibrium

A semi-interpenetrating network hydrogel with pore structure (P-S-IPN) was prepared by solution polymerization with 4-acetyl acryloyl ethyl acetate (AAEA) and crylic acid (AA) as monomers, polyvinylpyrrolidone (PVP) as the second network and polyving akohol 2000(PEG2000) as a pore-foaming agent. Gold nanoparticle composite hydrogel (GNPs gel) was obtained through in-situ reduction reaction by using P-S-IPN as a template. P-S-IPN exhibits excellent mechanical strength, the maximum compressive strength is 14.0 Mpa. The influence of the dosage of PEG2000 on the swelling/deswelling properties of P-S-IPN and GNPs gel was investigated. The pore structures could shorten the time that P-S-IPN takes to reach swelling equilibrium from 170min to 75min, improve the ability of P-S-IPN to absorb AuCl4-. The swelling/deswelling properties of GNPs gel under an applied voltage showed when the concentration of NaCl solutions exceed 0.025mol/L, the hydrogel swells, when the concentration of NaCl solutions is below 0.025mol/L, it deswells.

scholarly journals In situ synthesis and characterization of sulfonic acid functionalized hierarchical silica monoliths

2020 ◽  
Vol 96 (1) ◽  
pp. 67-82
Author(s):  
Richard Kohns ◽  
Ralf Meyer ◽  
Marianne Wenzel ◽  
Jörg Matysik ◽  
Dirk Enke ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
In Situ Synthesis ◽  
Synthesis And Characterization ◽  
Silica Monoliths

scholarly journals In Situ Compensation Method for Precise Integral SQUID Magnetometry of Miniscule Biological, Chemical, and Pow-der Specimens Requiring the Use of Capsules

2022 ◽  
Author(s):  
Katarzyna Gas ◽  
Maciej Sawicki
Keyword(s):  
Reduction Method ◽  
Experimental Methodology ◽  
Sample Holder ◽  
Squid Magnetometry ◽  
In Situ Reduction ◽  
Magnetic Characterization ◽  
Data Reduction Method ◽  
Alignment Errors

Steadily growing interest in magnetic characterization of organic compounds for therapeutic purposes or of other irregularly shaped specimens calls for refinements of experimental methodology to satisfy experimental challenges. Encapsulation in capsules remains the method of choice, but its applicability in precise magnetometry is limited. This is particularly true for minute specimens in the single milligram range as they are outweighed by the capsules and are subject to large alignment errors. We present here a completely new experimental methodology that permits 30-fold in situ reduction of the signal of capsules by substantially restoring the symmetry of the sample holder that is otherwise broken by the presence of the capsule. In practical terms it means that the standard 30 mg capsule is seen by the magnetometer as approximately a 1 mg object, effectively opening the window for precise magnetometry of single milligram specimens. The method is shown to work down to 1.8 K and in the whole range of the magnetic fields. The method is demonstrated and validated using the reciprocal space option of MPMS-SQUID magnetometers; however, it can be easily incorporated in any magnetometer that can accommodate straw sample holders (i.e., the VSM-SQUID). Importantly, the improved sensitivity is accomplished relying only on the standard accessories and data reduction method provided by the SQUID manufacturer, eliminating the need for elaborate raw data manipulations.

scholarly journals In Situ Compensation Method for Precise Integral SQUID Magnetometry of Miniscule Biological, Chemical, and Pow-der Specimens Requiring the Use of Capsules

2021 ◽  
Author(s):  
Katarzyna Gas ◽  
Maciej Sawicki
Keyword(s):  
Organic Compounds ◽  
Reduction Method ◽  
Experimental Methodology ◽  
Squid Magnetometry ◽  
In Situ Reduction ◽  
Magnetic Characterization ◽  
Data Reduction Method ◽  
Alignment Errors

Steadily growing interest in magnetic characterization of organic compounds aiming at therapeutic purposes, or of other irregular-shaped specimens calls for refinements of experimental methodology to satisfy experimental challenges. Encapsulation in capsules remains the method of choice, but its applicability in precise magnetometry is limited. This is particularly true for minute specimens in single mg range since they are outweighed by the capsules and due to large alignment errors. We present here a complete new experimental methodology which permits 30-fold in situ reduction of the signal of capsules. In practical terms it means that the standard 30 mg capsule is seen by the magnetometer as about 1 mg object, effectively opening the window for precise magnetometry of single mg specimens. The method is shown to work down to 1.8 K and in the whole range of the magnetic fields. The method is demonstrated and validated using the reciprocal space option of MPMS-SQUID magnetometers, however it can be easily incorporated in any magnetometer which can accommodate straw sample holders (i.e. the VSM-SQUID). Importantly, the improved sensitivity is accomplished relying only on the standard accessories and data reduction method provided by the SQUID manufacturer, eliminating needs for an elaborate raw data manipulations.

scholarly journals In Situ Compensation Method for Precise Integral SQUID Magnetometry of Miniscule Biological, Chemical, and Powder Specimens Requiring the Use of Capsules

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 495
Author(s):  
Katarzyna Gas ◽  
Maciej Sawicki
Keyword(s):  
Reduction Method ◽  
Experimental Methodology ◽  
Sample Holder ◽  
Squid Magnetometry ◽  
In Situ Reduction ◽  
Magnetic Characterization ◽  
Data Reduction Method ◽  
Alignment Errors

Steadily growing interest in magnetic characterization of organic compounds for therapeutic purposes or of other irregularly shaped specimens calls for refinements of experimental methodology to satisfy experimental challenges. Encapsulation in capsules remains the method of choice, but its applicability in precise magnetometry is limited. This is particularly true for minute specimens in the single milligram range as they are outweighed by the capsules and are subject to large alignment errors. We present here a completely new experimental methodology that permits 30-fold in situ reduction of the signal of capsules by substantially restoring the symmetry of the sample holder that is otherwise broken by the presence of the capsule. In practical terms it means that the standard 30 mg capsule is seen by the magnetometer as approximately a 1 mg object, effectively opening the window for precise magnetometry of single milligram specimens. The method is shown to work down to 1.8 K and in the whole range of the magnetic fields. The method is demonstrated and validated using the reciprocal space option of MPMS-SQUID magnetometers; however, it can be easily incorporated in any magnetometer that can accommodate straw sample holders (i.e., the VSM-SQUID). Importantly, the improved sensitivity is accomplished relying only on the standard accessories and data reduction method provided by the SQUID manufacturer, eliminating the need for elaborate raw data manipulations.

Synthesis and characterization of alumina-nickel nanocomposite through sol-gel route by in situ reduction

2020 ◽  
Vol 56 (3) ◽  
pp. 1089-1096
Author(s):  
Sarmistha Guha ◽  
Sudhir Kumar Ghosh ◽  
Mahua Ghosh Chaudhuri ◽  
Gopes Chandra Das ◽  
Rajib Dey
Keyword(s):  
Sol Gel ◽  
Synthesis And Characterization ◽  
In Situ Reduction
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