نتایج جستجو برای: ammonium peroxydisulfate

تعداد نتایج: 25388  

2006
Xinyu Zhang Harsha S. Kolla Xianghui Wang

Chemical oxidative polymerization of aniline in dilute aqueous acids using an ammonium peroxydisulfate oxidant proceeds via the intermediacy of large, colorless aggregates that act as ‘seeds’ in orchestrating the overall morphology of the product polyaniline. Observed for the first time by continuously monitoring the polymerization by static and dynamic light-scattering (LS) measurements, these...

Leila Ghalamch Maryam Aziz Mohammad Hossein Rasoulifard Mohammad Reza Eskandarian Negar Sehati

The present research involves effectual parameters on Cefixime trihydrate removal from aqueous solutions. Antibiotics are the main contributions in pharmaceutical waste; their presence causes major concern. The extensive utilization of antibiotics in aquaculture and prescriptions has led to the cultivation of various antibiotic-resistant bacteria and genes in wastewater. The UV-LED/S2O82- pr...

Journal: :Polymer international 2011
Gururaj M Neelgund Aderemi Oki

The synthesis of polyaniline (PANI) nanospheres by a simple template-free method has been described. The polymerization of aniline in aqueous medium was accomplished using ammonium persulfate without any protonic acid. The UV-vis spectrum of PANI nanospheres displayed the characteristic absorption peak of π-π* transition of the benzenoid ring at 355 nm. The oxidation state of PANI nanospheres w...

Journal: :Physical chemistry chemical physics : PCCP 2014
Sergio Morales-Torres Tânia L S Silva Luisa M Pastrana-Martínez Ana T S C Brandão José L Figueiredo Adrián M T Silva

A specific methodology based on nitric acid hydrothermal oxidation was used to control the surface chemistry of multi-walled (MWCNTs) and single-walled (SWCNTs) carbon nanotubes (CNTs) with different lengths, and this methodology was adapted to the use of sulphuric acid containing ammonium persulfate as an oxidizing agent. The amount of oxygen-containing surface groups depends on the number and...

2015
Qing-Qing Ni Yao-Feng Zhu Lu-Jun Yu Ya-Qin Fu

Multiple-phase nanocomposites filled with carbon nanotubes (CNTs) have been developed for their significant potential in microwave attenuation. The introduction of other phases onto the CNTs to achieve CNT-based heterostructures has been proposed to obtain absorbing materials with enhanced microwave absorption properties and broadband frequency due to their different loss mechanisms. The existe...

2012
N. Vishal Gupta H.G. Shivakumar

The objective of the present study is to develop and investigate the swelling behavior of pH-sensitive Superporous Hydrogel (SPH) and SPH composite (SPHC). A novel superporous hydrogel containing poly (methacrylic acid-co-acrylamide) was synthesized from methacrylic acid and acrylamide through the aqueous solution polymerization, using N,N-methylenebisacrylamide as a crosslinker and ammonium pe...

2006
M. A. Barakat Nurettin Sahiner

Synthesis and application of poly (3-Acrylamidopropyl)-trimethylammonium chloride (PAPTMACl) hydrogels as adsorbents for removal of toxic anions such as arsenate from water were investigated. PAPTMACl hydrogels were synthesized in the form of small cylinders, with using N, N’-methylene-bisacrylamide (MBA) as crosslinker. N,N,N’,N’-tetramethylethylenediamine (TEMED) was used as an accelerator, a...

Journal: :Biomedical materials 2012
Esha S Desai Mary Y Tang Amy E Ross Richard A Gemeinhart

We recently showed that superporous hydrogel (SPH) scaffolds promote long-term stem cell viability and cell driven mineralization when cells were seeded within the pores of pre-fabricated SPH scaffolds. The possibility of cell encapsulation within the SPH matrix during its fabrication was further explored in this study. The impact of each chemical component used in SPH fabrication and each step...

Journal: :Acta biomaterialia 2008
Baljit Singh Nirmala Chauhan

Molecular imprinting is a new and rapidly evolving technique used to create synthetic receptors and it possesses great potential in a number of applications in the life sciences. Keeping in mind the therapeutic importance of 5-fluorouracil (5-FU) and the technological significance of molecular imprinting polymers, the present study is an attempt to synthesize 2-hydroxyethylmetacrylate- and acry...

2002
Thomas G. Chasteen Mary F. Plishker

Bius, Janet Horton, Developing a Method for Determining the Mass Balance of Selenium and Tellurium Bioprocessed by a Selenium-Resistant Bacterium Grown in the Presence of Selenite or Tellurite, Master of Science (Chemistry), December, 2001. Sam Houston State University, Huntsville, Texas, 68 pp. Purpose The purpose of this investigation was to determine: (1) the mass balance of selenium or tell...

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