Redox Characterization of the Surfaces of Seven Iron-Bearing Minerals: Use of Molecular Probes and UV-Visible Spectroscopy

1996 ◽  
Vol 44 (5) ◽  
pp. 573-586 ◽  
Author(s):  
Y. Shane Yu
Keyword(s):  
Molecular Probes ◽  
Visible Spectroscopy ◽  
Uv Visible ◽  
Iron Bearing

Synthesis and Characterization of Gold Nanoparticles Synthesized in Gel and Paper by Electrolysis

2019 ◽  
Vol 824 ◽  
pp. 163-167
Author(s):  
Pema Dechen ◽  
Ekasith Somsook
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Gold Nanoparticles ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Visible Spectroscopy ◽  
Gold Leaf ◽  
Uv Visible ◽  
Scanning Electron

In this report, synthesis and characterization of gold nanoparticles (AuNPs) from gold leaf by electrolysis in two different media (gel and paper) in presence of sodium chloride (NaCl), glucose (C6H12O6) and polyvinyl pyrrolidone (PVP) at room temperature were investigated. Graphite was used as two electrodes, NaCl was used as an electrolyte, C6H12O6 was used as reducing agent and PVP was used as stabilizer to control the aggregation of the nanoparticles. UV-Visible spectroscopy (UV-Vis) and scanning electron microscopy (SEM) were used to confirm the characteristics and morphologies of the synthesized AuNPs.

In Situ Polymerization and Characterization of Poly(ε-caprolactone)/Layered Double Hydroxide Nanocomposites

2012 ◽  
Vol 557-559 ◽  
pp. 371-374
Author(s):  
Lian Liu ◽  
Teng Yu ◽  
Pei Wang ◽  
Guang Shuo Wang
Keyword(s):  
Layered Double Hydroxide ◽  
In Situ Polymerization ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Uv Visible ◽  
Absorbance Peak ◽  
Double Hydroxide

Nanocomposites of poly(ε-caprolactone) (PCL) and layered double hydroxide (LDH) were prepared by in situ polymerization at low LDHs loadings in this work. The resultants were characterized by FTIR spectroscopy, X-ray diffraction (XRD), differential scanning calorimeter (DSC) and UV-visible spectroscopy (UV-vis). FTIR showed that the PCL/LDHs nanocomposites were prepared successfully by in situ polymerization and XRD spectra showed that the crystal structure did not change greatly in the presence of LDHS. DSC results confirmed that LDHs could act as nucleating agents. UV-vis spectra showed that LDHs had stronger absorbance peak than LDH. Moreover, the PCL/LDHs nanocomposites had strong anti-ultraviolet effect by introduction of LDHs into polymer matrix.

Synthesis and NMR Spectroscopic Characterization of Some Fluoro-2H-1-Benzopyran Derivatives

2005 ◽  
Vol 58 (7) ◽  
pp. 517 ◽  
Author(s):  
Yannick Teral ◽  
Gabriel Roubaud ◽  
Claude Aubert ◽  
Robert Faure ◽  
Mylène Campredon
Keyword(s):  
Mass Spectra ◽  
Spectroscopic Characterization ◽  
Molecular Probe ◽  
Visible Spectroscopy ◽  
Chemical Shift Correlation ◽  
Photochemical Process ◽  
Fragment Ions ◽  
Complete Assignment ◽  
Uv Visible

The synthesis of some new fluoro-2H-1-benzopyran derivatives utilizing a reaction between titanium phenolates and β-phenylcinnamaldehydes in toluene is reported. These compounds were characterized by NMR and UV/visible spectroscopy as well as mass spectrometry. In solution all the compounds are photochromic. Complete assignment of the 1H and 13C resonances was achieved by concerted application of homonuclear (gs-COSY), proton-detected (C, H) one-bond (gs-HMQC), and long-range (gs-HMBC) heteronuclear two-dimensional chemical shift correlation experiments using a 500 MHz NMR spectrometer equipped with a cryoplatform and a 5 mm cryoprobe. The mass spectra of the different compounds were characterized by intense molecular and high fragment ions. The introduction of an atom of fluorine as a molecular probe is of interest in determining the mechanistic aspects of the photochemical process.

scholarly journals Synthesis and characterization of Fe(III) complex with thiosemicarbazide-based ligand

2020 ◽  
Keyword(s):  
Mass Spectrometry ◽  
Condensation Reaction ◽  
Azomethine Nitrogen ◽  
Synthesis And Characterization ◽  
Stoichiometric Ratio ◽  
Significant Activity ◽  
Visible Spectroscopy ◽  
Thiol Form ◽  
Uv Visible

Complex iron(III) salicylaldehyde thiosemicarbazone with a formula Na[Fe(STSC)2] have been synthesized. Ligand, salicylaldehyde thiosemicarbazone (SCT) was prepared through the condensation reaction of salycilaldehide with thiosemicarbazide. Na[Fe(STSC)2] has been synthesized by reacting FeCl3 with thiosemicarbazide based ligand bearing ONS donor atoms. Complex has been formulated and characterized by mass spectrometry, infrared and UV/visible spectroscopy. The facts showed the formation of a complex in metal:ligand stoichiometric ratio 1:2. The ligand is coordinated as an ONS tridentate dianion via oxygen atom after the deprotonation of the phenolic OH-group, azomethine nitrogen and sulphur in thiol form of the deprotonated thiosemicarbazide residue. Antioxidant activity was determined, where ligand showed significant activity, while complex, at low concentration, exhibited almost no activity.

scholarly journals Design, Development and Characterization of Graphene Sand Nano-Composite for Water Filtration

2020 ◽  
Vol 63 (2) ◽  
pp. 118-122
Author(s):  
Shahid Hussain Abro ◽  
Alidad Chandio ◽  
Iftikhar A. Channa ◽  
Abdulaziz S. Alaboodi
Keyword(s):  
Design Development ◽  
Visible Spectroscopy ◽  
Sem Images ◽  
River Sand ◽  
Nano Composite ◽  
Ftir Characterization ◽  
Global Issue ◽  
Scientific Approach ◽  
Uv Visible

  Water purification and filtration is a global issue and many researchers are engaged to resolve this problem by adopting the scientific approach, graphene sand composite was prepared through bio- synthesized technique. River sand was used in this context to remove the impurities already present in the sand 0.1M nitric acid treated the sand and the product was powder black in colour, referred as GSC, graphene sand composite. SEM, XRD and FTIR characterization was used to analyze the results. SEM images showed nano sized layers or sheets of graphene extending outwards.The XRD peak represents the multi lagered graphene structure which is formed by the treatment of the composite with acid and application of the high temperature during experiment UV-visible spectroscopy results successfully reveals the filtration difference between mud water and filtered water.  

A Logical Approach to Development of Natamycin Loaded NLCs: Preformulation Studies, Formulation Development and In Vitro Characterization

2021 ◽  
pp. 6033-6040
Author(s):  
Ishwari Choudhary ◽  
Preeti K. Suresh
Keyword(s):  
Entrapment Efficiency ◽  
Formulation Development ◽  
Visible Spectroscopy ◽  
Scanning Calorimetry ◽  
Solubility Profile ◽  
In Vitro Characterization ◽  
Uv Visible ◽  
Preformulation Studies

This study was aimed at the development of natamycin loaded nano-structured lipid carriers (NLCs) and their characterization for physicochemical properties i.e., Fourier Transform Infrared (FTIR), UV-Visible spectroscopy, meting point, solubility profile and partition coefficient. FTIR and Differential Scanning Calorimetry (DSC) permit the characterization of the drug, excipients and binary mixture and thus assisted in predicting the compatibility of natamycin with other excipients. Lipid screening for formulation of NLCs were performed by their solubility and drug affinity studies. High homogenization and sonication method was employed for the development of natamycin loaded NLCs and it was characterized for vesicle size, zeta potential, % entrapment efficiency, viscosity, pH and percentage drug release up to 12 h.

Active site cobalt(II)-substituted liver alcohol dehydrogenase: characterization of intermediates in the reduction of p-nitrobenzaldehyde by rapid-scanning UV-visible spectroscopy

Biochemistry ◽  
1983 ◽  
Vol 22 (14) ◽  
pp. 3424-3431 ◽  
Author(s):  
Steven C. Koerber ◽  
Alastair K. H. MacGibbon ◽  
Helmut Dietrich ◽  
Michael Zeppezauer ◽  
Michael F. Dunn
Keyword(s):  
Alcohol Dehydrogenase ◽  
Active Site ◽  
Visible Spectroscopy ◽  
Liver Alcohol Dehydrogenase ◽  
Uv Visible ◽  
Rapid Scanning
Sign in / Sign up

Export Citation Format

Share Document