Characterization of Primary Amine Capped CdSe, ZnSe, and ZnS Quantum Dots by FT-IR: Determination of Surface Bonding Interaction and Identification of Selective Desorption

Langmuir ◽  
2011 ◽  
Vol 27 (13) ◽  
pp. 8486-8493 ◽  
Author(s):  
Jason K. Cooper ◽  
Alexandra M. Franco ◽  
Sheraz Gul ◽  
Carley Corrado ◽  
Jin Z. Zhang
Keyword(s):  
Quantum Dots ◽  
Primary Amine ◽  
Bonding Interaction ◽  
Ft Ir ◽  
Surface Bonding

scholarly journals SOLID STATE CHARACTERIZATION OF A NOVEL PHYSICAL INTERACTION (PARACETAMOL-CHLORPHENIRAMINE MALEATE)

2018 ◽  
Vol 10 (1) ◽  
pp. 21
Author(s):  
Iyan Sopyan ◽  
Intan Mutiara Sari ◽  
Insan Sunan K.
Keyword(s):  
Solid State ◽  
Pure Substance ◽  
Physical Interaction ◽  
X Ray Diffraction ◽  
Chlorpheniramine Maleate ◽  
Pharmaceutical Dosage Form ◽  
Pharmaceutical Ingredients ◽  
Ft Ir

Objective: Interactions of active pharmaceutical ingredients (API) as well as pharmaceutical excipients don’t occur in a pharmaceutical dosage form. Base on structures of paracetamol (PCT) and chlorphenamine maleate (CTM), its combination is possible to give a physical interaction in the solid state. This study was conducted to investigate the physical interaction of PCT and CTM in the solid state.Methods: Characterization used the polarization microscope, solubility test, powder x-ray diffraction (PXRD) to observe peak shifting in 2Ɵ angle, and fourier transform infrared spectroscopy (FT-IR) to examine wavenumber shifting.Results: Results of solubility exhibited an increased solubility percentage with increasing concentration. Polarization microscope analysis presented a combination of crystal morphology after the two substances were mixed in an equimolar ratio. The result of melting point determination of each pure substance was 172 °C for PCT, 132 °C for CTM, and 170 °C for the mixture of the two substances in various ratios. Diffractogram showed the shifting at angle 2Ɵ: 20.715, 19.355-23.500 and 21.840, 26.455-20.330 for concentration ratio of PCT: CTM in (132:0.5) and (330:1) respectively and any change in the functional group was observed from infrared spectrum.Conclusion: All evaluation of PCT and CTM in the solid state has exhibited the interaction in solid condition.

Advances in the growth and characterization of Ge quantum dots and islands

2005 ◽  
Vol 20 (12) ◽  
pp. 3278-3293 ◽  
Author(s):  
J-M. Baribeau ◽  
N.L. Rowell ◽  
D.J. Lockwood
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Spatial Distribution ◽  
Strain Distribution ◽  
Growth Parameters ◽  
Nucleation And Growth ◽  
Structural And Optical Properties ◽  
Ge Quantum Dots

We review recent advances in the growth of Si1−xGex islands and Ge dots on (001) Si. We first discuss the evolution of the island morphology with Si1−xGex coverage and the effect of growth parameters or post-growth annealing on the shape of the islands and dots. We outline some of the structural and optical properties of Si1−xGex islands and assess progress in the determination of their composition and strain distribution. Finally, we discuss various approaches currently being investigated to engineer Si1−xGex quantum dots and in particular to control their size, density, and spatial distribution. For example, we show how C pre-deposition on Si (001) can influence the nucleation and growth of Ge islands.

Characterization of Geopolymer Materials Containing MSWI Fly Ash and Coal Fly Ash

2010 ◽  
Vol 69 ◽  
pp. 123-128 ◽  
Author(s):  
Salvatore Andini ◽  
Raffaele Cioffi ◽  
Francesco Colangelo ◽  
Claudio Ferone ◽  
Fabio Montagnaro ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Mswi Fly Ash ◽  
Three Samples ◽  
Chemical Behaviour ◽  
Ft Ir ◽  
Ft Ir Spectroscopy ◽  
Polycondensation Products

In this work three samples of MSWI ash have been stabilized in systems containing coal fly ash and able to give geopolymers through a polycondensation reaction. Monolithic products were obtained with both MSWI ashes as received and after chloride partial removal by water washing. The polycondensation products have been characterized qualitatively by means of FT-IR spectroscopy and scanning electron microscopy (SEM) and quantitatively through the determination of the amount of reacted water and silicate. Differently from traditional cement based stabilization systems, those based on geopolymerization show a chemical behaviour almost insensitive to the presence of chlorides and sulphates in the MSWI ash. On the other hand, the microstructure is strongly affected by the content of soluble salts.

Determination of Molecular Weight and Structure Characterization of Canna Amylose Purified Using the Method of n-Butanol Recrystallization

2012 ◽  
Vol 554-556 ◽  
pp. 1216-1222
Author(s):  
Hai Xin Shi ◽  
Yan Zhen Yin ◽  
Xiao Xi Hu ◽  
Shu Fei Jiao
Keyword(s):  
Molecular Weight ◽  
Average Molecular Weight ◽  
Structure Characterization ◽  
X Ray Diffraction ◽  
Ft Ir ◽  
Granule Surface ◽  
Chemical Groups ◽  
Ubbelohde Viscometer

The canna amylose (CAM) was separated from canna starch grown in China and purified both using the method of n-butanol recrystallization. The purity, morphology, spectral properties and molecular weight of CAM were characterized by ultraviolet and visible spectrophotometer (UV/Vis), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscope (FT-IR) and Ubbelohde viscometer. Maximum absorption wavelength of the purified CAM (635－638 nm) and it’s blue values (BV) (1.167 ± 0.209) prove that the purification of the CAM by n-butanol recrystallization was successfully carried out. The SEM results show that CAM granule surface become rougher and the CAM granule size become smaller than that of canna starch. The XRD results suggest that most of CAM granule is amorphous. And the FT-IR results show that the basic chemical groups of canna starch are also presented in CAM. However, the amorphous area of CAM is increased. The intrinsic viscosity and viscosity-average molecular weight of CAM is 78.5 mL/g and 1.65×105, respectively.

Synthesis of Allyl Pentaerythritol Crosslinker based Polymer Hydrogels and Determination of the Crosslink Density

2021 ◽  
Vol 25 (11) ◽  
pp. 138-142
Author(s):  
Anamica . ◽  
Poorn Prakash Pande
Keyword(s):  
Crosslink Density ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Polymer Gels ◽  
Polymer Hydrogels ◽  
Swelling Capacity ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

In this study, we report the synthesis and characterization of polymer hydrogels. The polymer gels have been prepared from acrylic acid (AA) monomer using allyl pentaerythritol as the crosslinker in the presence of potassium persulfate initiator. The synthesized polymer gels have been characterized by Fourier-transform infrared (FT-IR) spectroscopy. The swelling capacity and crosslink density of the synthesized polymer gels have been determined and it was found that some of the polymer samples behave like super-absorbent polymers. These polymeric-gels can be utilized in various applications viz. as a catalyst for dye removal, for anion removal from water and for heavy metal removal etc.

Concerning the Application of FT-IR to the Study of Coal: A Critical Assessment of Band Assignments and the Application of Spectral Analysis Programs

1981 ◽  
Vol 35 (5) ◽  
pp. 475-485 ◽  
Author(s):  
Paul C. Painter ◽  
Randy W. Snyder ◽  
Michael Starsinic ◽  
Michael M. Coleman ◽  
Deborah W. Kuehn ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Aromatic Ring ◽  
Curve Fitting ◽  
Critical Assessment ◽  
Extinction Coefficients ◽  
Quantitative Measurements ◽  
Ft Ir ◽  
The Relationship

The problems associated with the application of FT-IR to the characterization of coal structure are critically discussed. The controversies concerning band assignments are considered and it is concluded that the strong 1600 cm−1 band can be assigned to an aromatic ring stretching mode that in most coals is intensity enhanced by the presence of phenolic groups. The application of computer routines to the determination of OH and CH groups is considered. Established criteria for curve fitting are applied to the problem. Qualitative identification of functional groups is achieved, but consistent quantitative measurements will require a determination of the relationship between the extinction coefficients of resolved bands.

Preparation and characterization of Fe3O4/graphene quantum dots nanocomposite as an efficient adsorbent in magnetic solid phase extraction: application to determination of bisphenol A in water samples

2014 ◽  
Vol 6 (20) ◽  
pp. 8413-8419 ◽  
Author(s):  
Rahim Mohammad-Rezaei ◽  
Habib Razmi ◽  
Vahideh Abdollahi ◽  
Amir Abbas Matin
Keyword(s):  
Quantum Dots ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Graphene Quantum Dots ◽  
Magnetic Solid Phase Extraction ◽  
Phase Extraction ◽  
Magnetic Solid ◽  
Efficient Adsorbent

This study describes the preparation, characterization and application of Fe3O4/graphene quantum dots nanocomposite as a novel adsorbent for magnetic solid phase extraction.

scholarly journals Multicomponent Materials to Improve Solubility: Eutectics of Drug Aminoglutethimide

Crystals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 40
Author(s):  
Basanta Saikia ◽  
Andreas Seidel-Morgenstern ◽  
Heike Lorenz
Keyword(s):  
Melting Point ◽  
Molar Ratio ◽  
Experimental Characterization ◽  
X Ray ◽  
Eutectic Mixtures ◽  
Ft Ir ◽  
Aqueous Solubilities ◽  
Ft Ir Spectroscopy

Here, we report the synthesis and experimental characterization of three drug-drug eutectic mixtures of drug aminoglutethimide (AMG) with caffeine (CAF), nicotinamide (NIC) and ethenzamide (ZMD). The eutectic mixtures i.e., AMG-CAF (1:0.4, molar ratio), AMG-NIC (1:1.9, molar ratio) and AMG-ZMD (1:1.4, molar ratio) demonstrate significant melting point depressions ranging from 99.2 to 127.2 °C compared to the melting point of the drug AMG (151 °C) and also show moderately higher aqueous solubilities than that of the AMG. The results presented include the determination of the binary melt phase diagrams and accompanying analytical characterization via X-ray powder diffraction, FT-IR spectroscopy and scanning electron microscopy.

scholarly journals INTERCALATION OF OLYGOMER OF HYDROXYL-CHROMIUM INTO NATURAL KAOLINITE

2010 ◽  
Vol 8 (1) ◽  
pp. 31-36
Author(s):  
Rodiansono Rodiansono ◽  
Reda Ariyantie ◽  
Abdullah Abdullah
Keyword(s):  
Surface Area ◽  
Pore Radius ◽  
Nitrate Solution ◽  
Chemical Properties ◽  
Basal Spacing ◽  
Physico Chemical ◽  
Ft Ir ◽  
N2 Sorption

Preparation of a kaolin-hydroxyl chromium composite and characterization of its physico-chemical properties were conducted. The olygomer hydroxyl-chromium was prepared by adding Na2CO3 to 0.1 M chromium nitrate solution (ratio OH/Cr = 2) and then dried at 110 oC and 400 oC for 4 h. Characterization of kaolin-hydroxyl chromium composite includes determination of acidity, functional groups, basal spacing, and surface area (BET-N2 sorption analyzer). The result showed that intercalation of hydroxyl chromium resulted in the decreasing of basal spacing but increased the specific surface area of kaolin. Drying of the intercalated kaolin at 400 oC decreased surface area, total volume pore and pore radius. FT-IR spectra showed that hydroxyl-chromium detected at wavelength of 2925 and 2855 cm-1.   Keywords: natural kaolin, intercalation, olygomer hydroxyl-chromium, kaolin-hydroxyl chromium composite

scholarly journals CdSe/ZnS Quantum Dots As a Fluorescence Probes For Determination of Vitamin B1

2021 ◽  
Author(s):  
Reza Tirbandpaya ◽  
Abdolraouf Samadi-Maybodi
Keyword(s):  
Quantum Dots ◽  
Limit Of Detection ◽  
Vitamin B1 ◽  
Fluorescence Probes ◽  
Fast Method ◽  
Excitonic Absorption ◽  
Wet Chemical ◽  
Excitonic Absorption Peak

Abstract This paper presents a new and fast method for determination of vitamin B1 (thiamine) using functionalized CdSe/ZnS quantum dots (QDs) as a sensor. In this study the core-shell CdSe/ZnS QDs with thioglycolic acid capping agents were synthesized by wet chemical method in aqueous solution. Electronic absorption was applied for size determination of the QDs, the average diameters of the synthesized quantum dots were calculated using wavelength of the first excitonic absorption peak. The methods of FESEM and FTIR were also used for characterization of the prepared samples. The results indicated that vitamin B1 could effectively quench the QDs emission and the fluorescence intensity decreased linearly with the concentration of vitamin B1 ranging from 10-7 to 10-4 molL−1 with limit of detection of 2×10-8 mol L−1. Determination of vitamin B1in pills from two pharmaceutical companies were used as real samples using this method .

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