Characterization of hydroxyl groups of highly crystalline β-chitin under static tension detected by FT-IR

2012 ◽  
Vol 87 (3) ◽  
pp. 2154-2159 ◽  
Author(s):  
Yukie Saito ◽  
Tadahisa Iwata
Keyword(s):  
Hydroxyl Groups ◽  
Static Tension ◽  
Ft Ir

scholarly journals Synthesis, Fabrication, and Characterization of Functionalized Polydiacetylene Containing Cellulose Nanofibrous Composites for Colorimetric Sensing of Organophosphate Compounds

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1869
Author(s):  
A K M Mashud Alam ◽  
Donovan Jenks ◽  
George A. Kraus ◽  
Chunhui Xiang
Keyword(s):  
Solid State ◽  
Hydroxyl Groups ◽  
Colorimetric Sensing ◽  
Electrospinning Technique ◽  
Hazardous Chemical ◽  
Tensile Tester ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Landmark Study

Organophosphate (OP) compounds, a family of highly hazardous chemical compounds included in nerve agents and pesticides, have been linked to more than 250,000 annual deaths connected to various chronic diseases. However, a solid-state sensing system that is able to be integrated into a clothing system is rare in the literature. This study aims to develop a nanofiber-based solid-state polymeric material as a soft sensor to detect OP compounds present in the environment. Esters of polydiacetylene were synthesized and incorporated into a cellulose acetate nanocomposite fibrous assembly developed with an electrospinning technique, which was then hydrolyzed to generate more hydroxyl groups for OP binding. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), Instron® tensile tester, contact angle analyzer, and UV–Vis spectroscopy were employed for characterizations. Upon hydrolysis, polydiacetylene esters in the cellulosic fiber matrix were found unaffected by hydrolysis treatment, which made the composites suitable for OP sensing. Furthermore, the nanofibrous (NF) composites exhibited tensile properties suitable to be used as a textile material. Finally, the NF composites exhibited colorimetric sensing of OP, which is visible to the naked eye. This research is a landmark study toward the development of OP sensing in a protective clothing system.

Synthesis and Characterization of an Alendronate-Chitosan Conjugate

2011 ◽  
Vol 140 ◽  
pp. 53-57 ◽  
Author(s):  
Xiao Hong Shao ◽  
Ji Qing Xu ◽  
Yan Peng Jiao ◽  
Chang Ren Zhou
Keyword(s):  
Drug Delivery ◽  
Drug Delivery System ◽  
Synthesis And Characterization ◽  
Hydroxyl Groups ◽  
Amino Groups ◽  
H Nmr ◽  
Ft Ir ◽  
Novel Drug Delivery System ◽  
Novel Drug

The biomineral-binding alendronate-chitosan conjugate (Scheme 1) was developed as a novel drug delivery system. Alendronate was conjugated to the hydroxyl groups of chitosan, thereby maintaining the amino groups of chitosan intact. By means of FT-IR and 1H NMR, the characterization was conducted to confirm the successful synthesis of alendronate-chitosan conjugate.

scholarly journals Efficient Synthesis and Characterization of Some Novel Nitro-Schiff Bases and Their Complexes of Nickel(II) and Copper(II)

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Hossein Naeimi ◽  
Mohsen Moradian
Keyword(s):  
Schiff Base ◽  
Schiff Base Complexes ◽  
Synthesis And Characterization ◽  
Planar Geometry ◽  
Hydroxyl Groups ◽  
Spectroscopic Techniques ◽  
Spectral Techniques ◽  
Chemical Structures ◽  
Ft Ir

Synthesis and characterization of some new Schiff base ligands derived from various diamines and nitrosalicylaldehyde and their complexes of Ni(II) and Cu(II) are reported. Several spectral techniques such as UV-Vis, FT-IR, and NMR spectra were used to identify the chemical structures of the reported ligands and their complexes. The ligands are found to be bound to the metal atom through the oxygen atoms of the hydroxyl groups and nitrogen atoms of imine groups, which is also supported by spectroscopic techniques. The results obtained by FT-IR and NMR showed that the Schiff base complexes of transition metal (II) have square-planar geometry.

Surface Grafting Modification of Silk Fibroin by Atom Transfer Radical Polymerization

2008 ◽  
Vol 373-374 ◽  
pp. 629-632 ◽  
Author(s):  
Tie Ling Xing ◽  
Hai Jiang Wang ◽  
Zhan Xiong Li ◽  
Guo Qiang Chen
Keyword(s):  
Silk Fibroin ◽  
Gel Permeation Chromatography ◽  
Catalyst System ◽  
Hydroxyl Groups ◽  
Amino Groups ◽  
Grafting Modification ◽  
Antibacterial Surface ◽  
Ft Ir ◽  
Tertiary Amino

In this work, surface modification of silk fibroin was conducted by grafting dimethylaminoethyl methacrylate (DMAEMA) via ATRP to produce well controlled grafting silk. First, the amino groups and hydroxyl groups on the side chains of the silk fibroin reacted with 2-bromoisobutyryl bromide (BriB-Br) to obtain efficient initiator for ATRP. Subsequently, the functional silk fibroin was used as macroinitiator of DMAEMA in 1,2-dichlorobenzene in conjunction with CuBr/N,N,N',N",N" -pentamethyldiethylenetriamine (PMDETA) as a catalyst system. FT-IR characterization of the modified silk substrate showed a peak corresponding to DMAEMA indicating that the polymer had been formed on the silk surface. Following the polymerization, the tertiary amino groups on the grafted silk fibroin were quaternized to produce a large concentration of quaternary ammonium groups, which endowed the silk substrate with potential antibacterial surface. The graft chains were cleaved by acid hydrolysis and analyzed by gel permeation chromatography (GPC). The GPC results indicated that the graft layer were well-controlled.

Synthesis and Characterization of Novel Hybrid Ladderlike Polysilsesquioxanes Containing Polypropylene Moieties

2013 ◽  
Vol 845 ◽  
pp. 204-208
Author(s):  
Deock Sam Park ◽  
Tae Sung Ha ◽  
Jung Hyurk Lim ◽  
Kyung Min Kim
Keyword(s):  
Melting Temperature ◽  
Hybrid Materials ◽  
Char Yield ◽  
Synthesis And Characterization ◽  
Hydroxyl Groups ◽  
Organic Polymers ◽  
Interesting Candidate ◽  
Ft Ir

Novel ladderlike polysilsesquioxanes containing polypropylene moieties (LPS-PP) were synthesized from LPS having chloromethylphenyl groups (LPS) and polypropylene having hydroxyl groups (PP-OH). LPS-PP was characterized by FT-IR, DSC, SEM, EDX, and TGA. The obtained LPS-PP shows no melting temperature due to the disappearance of melting temperature of PP, indicating the rigidity of Si-O-Si backbone in ladderlike LPS. The char yield of LPS-PP is higher than that of PP-OH because of the silica parts of LPS. This new LPS-PP can be an interesting candidate to fabricate hybrid materials using interactions or compatibility between PP moieties of LPS and various organic polymers.

Synthesis and Characterization of Zn Nanoparticles by Using Hetero-Bicyclic Compound

2014 ◽  
Vol 938 ◽  
pp. 3-8
Author(s):  
V. Pushpanathan ◽  
D. Suresh Kumar
Keyword(s):  
Condensation Reaction ◽  
Energy Dispersive Spectrum ◽  
Hydroxyl Groups ◽  
Bicyclic Compound ◽  
X Ray Diffraction ◽  
X Ray ◽  
Free Hydroxyl ◽  
Ft Ir ◽  
Esi Mass Spectrometry

The 1:1 condensation reaction between benzil and tris (hydroxymethyl) aminomethane in methanol yields a hetero bicyclic compound 5-(hydroxymethyl)-1,2-diphenyl-3,7-dioxa-8-aza-bicyclo [3.2.octan-2-ol. It was characterized by FT-IR, NMR (1H and 13C) spectroscopy and ESI mass spectrometry. The structure was conclusively determined by X-ray diffractrometric analysis. The structure shows a hetero bicyclic ring system. It consists of six membered morpholine and five membered oxazolidine rings with free hydroxyl groups. This bicyclic compound was used as a reducing and stabilizing agent to prepare zinc nanoparticles. The morphology and structure were characterized by field emission scanning electron microscope (FE-SEM), powder X-ray diffraction (XRD), and energy dispersive spectrum analysis (EDS).

scholarly journals Production of Alginate from Persian Gulf Sargassum angustifolium Seaweeds: Novel Extraction and Characterization Methods

2021 ◽  
Vol In Press (In Press) ◽  
Author(s):  
Abdolazim Behfar ◽  
Narges Aqajari ◽  
Mohammad Reza Shushizadeh ◽  
Zahra Ramezani ◽  
Ebrahim Rajabzadeh Ghatrami
Keyword(s):  
Biological Activities ◽  
Hydroxyl Groups ◽  
Characterization Methods ◽  
Mixture Treatment ◽  
Wide Range ◽  
Ft Ir ◽  
Sargassum Angustifolium ◽  
The Fourier Transform ◽  
G Ratio

Background: Brown seaweeds contain polysaccharides, minerals, proteins, pigments, polyphenols, and fatty acids. Several of these compounds show a wide range of biological activities, such as anticoagulant, anti-tumor, antiviral, and anti-cancer effects. Objectives: This study was designed to evaluate the extraction, purification, and characterization of alginate from Sargassum angustifolium simultaneous with fucoidan extraction and the effect of this process on the structure and properties of alginate. Methods: The extraction of alginate from S. angustifolium was carried out using defatting with organic solvents mixture, treatment with acid-base solutions, and purification with absolute ethanol. The novel characterization of this compound was carried out by the Fourier transform infrared spectroscopy (FT-IR), FT-NMR, energy dispersive X-ray (EDX), and florescent spectrophotometry methods. Results: The fluorescent emission of alginate showed 66.54% removal of impurities, such as phenolic compounds. The FT-IR analysis showed the carboxyl and hydroxyl groups as significant signals in the alginate structure. By analyzing the anomeric protons and other aspects of 1H-NMR, M/G ratio, FG, FM, FGG, FMM, FMG (or FGM) were determined to be 0.61, 0.62, 0.38, 0.31, 0.07, and 0.31, respectively. The intrinsic viscosity and molecular weight of alginate were 0.9 dL/g and 41.53 kDa, respectively. Conclusions: The total amount of alginate from the residual S. angustifolium was 17% of dried seaweed. The structure elucidation of alginate was performed with the FT-IR, FT-NMR, and EDX methods.

The Preparation and Characterization of Starch Oxidized by Nitric Acid and its Properties of Calcium Complexing Capacity

2013 ◽  
Vol 652-654 ◽  
pp. 1593-1596 ◽  
Author(s):  
Xue Chuan Wang ◽  
Fei Hu Li ◽  
Tao Tao Qiang
Keyword(s):  
Nitric Acid ◽  
Carboxylic Acids ◽  
Hydroxyl Groups ◽  
Oxidized Starch ◽  
Complexing Capacity ◽  
Primary Hydroxyl ◽  
Ft Ir

The primary hydroxyl groups of Starch Oxidized by nitric acid to the corresponding carboxylic acids has been investigated. The structure of the Oxidized-Starch(OS) was characterized by FT-IR, 1HNMR and GPC. The predicated product was obtained from the results. Its application in calcium complexing capacity has been discussed. The calcium complexing capacity of OS may up to 119.39 mg/g. The data confirmed that the starch oxidized by nitric acid had excellent capacity of calcium complexing.

Synthesis and Characterization of TiO2/ PSt/PVP Multilayer Core-Shell Hybrid Microspheres

2012 ◽  
Vol 512-515 ◽  
pp. 2443-2447 ◽  
Author(s):  
Li Ying Guo
Keyword(s):  
Decomposition Temperature ◽  
Tetrabutyl Titanate ◽  
Core Shell ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Ft Ir ◽  
Hydrolysis Of ◽  
Thermal Stability Of

Multiplayer core-shell TiO2/PSt/PVP hybrid microspheres were successfully synthesized by the copolymerization of vinylpyrrolidone in the solution of ethyl acetate with TiO2/PSt core-shell hybrid microspheres which were formed through the encapsulation of KH570-g-TiO2 sol particles with styrene, while the active KH570-g-TiO2 sol particles were prepared by the hydrolysis condensation of KH-570 with tetrabutyl titanate. Characterization technologies of FT-IR and TGA were applied to investigate the structure and the thermal stability of the product. The results showed that the hydroxyl groups from the hydrolysis of KH-570 condensed with the surface hydroxyl groups of TiO2, as well as PSt and PVP were grafted successively onto the surface of KH570-g-TiO2 sol particles. The thermal decomposition temperature of TiO2/PSt/PVP was higher than TiO2/PSt, which also indicated that the obtained product was the final objective product.

Synthesis and Structural Characterization of Mg/Al Hydrotalcite-Like Compounds

2012 ◽  
Vol 549 ◽  
pp. 353-357 ◽  
Author(s):  
Yan Guo ◽  
Wei Jun Liu ◽  
Shu Hua Zhang ◽  
Si Yuan Yang ◽  
Kai Fei Zhang ◽  
...  
Keyword(s):  
Ir Spectra ◽  
Structural Characterization ◽  
Pore Volume ◽  
Positive Charge ◽  
High Surface ◽  
High Surface Area ◽  
Total Pore Volume ◽  
Hydroxyl Groups ◽  
Ft Ir

Hydrotalcites consist of Brucite-like layers with positive charge and anionic compounds in the interlayer to form neutral materials. The general formula of hydrotalcite compounds (HTLc) was Mg-A1-HTLc. All samples were characterized by XRD, FT-IR spectra and TG. After calcination, the transformation of hydrotalcite structure can be characterized by vibration infrared bands corresponding to hydroxyl groups, octahedral layers and interlayer species. Moreover, the calcined samples show a relatively high surface area and total pore volume.

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