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Section 7. Materials Science
Section 7. Materials Science
Mahmudov Hokman Movajat, Ismayilova Mehpara Kamil, Gadzhieva Nushaba Nubarak, Melikova Sevinc Zellabdin, Institute of Radiation Problems NAS of Azerbaijan E-mail: sevinc.m@rambler.ru
Study of impact of Al2O3 nanoparticles on aqueous solution of carboxymethyl cellulose (CMC)
Abstract: It was investigated the stability of nanosystems using modern analytical methods. It has been established that the role of the Al2O3 nanoparticles is dual. A very strong dependence of the concentration of nanoparticles is detected and interpreted in this manuscript. We support our conclusions by employing FT-IR spectroscopy. It was noted that the rheological parameters of carboxymethyl cellulose improved after nanoeffect.
Keywords: Al2O3 nanoparticles, carboxymethyl cellulose, FT- IR -spectroscopy, nanostructure, destruction.
Introduction
In recent years there has been a great deal of research on the subj ect of nanostructured materials. The superior behavior of nanomaterials compared to the parent materials originates from nanoparticles grain boundary, surface area per unit over mass or volume, size, purity and perfection of the particles [1]. Among these materials nanostructured surfactant-polymers are of special interest, including the nanostructured carboxy-methyl cellulose (CMC).
Nanomaterials based on nanostructured carboxymethyl cellulose (CMC) widely used for electrical, electronic goods and in oilfield operations, including drilling and enhanced oil recovery. Now it’s very important using a nanotechnology as one of the scientific directions of the XXI century in oil recovery processes (EOR), obtainment ofvarious liquid systems in presence of nanoparticles and their application in different areas of oil industry [2-5].
Many nanostructured materials have been and are being prepared with increasing control over molecular configurations, conformations, and supramolecular assembly. These nanomaterials place an increasing challenge for characterization techniques to confirm the proposed structure and morphology [6]. From these methods Fourier Infrared Spectroscopy is very interesting and gives important informations about structure change.
Nanostructured polimer blends open up a new arena for polymer blends, and research shows that nanoblends have outstanding optical and mechanical properties.
The exceptional properties of nanoheterogeneous materials result both from the nature of each component, the size scale, the degree of mixing between the two phases, and the surface area-to-volume ratio. Therefore, significant
performances of the resulting materials can be reached by tailoring the interfaces. Due to their features, nanoheterogeneous materials have been involved in a plethora of niche markets linked, for instance, to new generations of smart textiles, photovoltaic and fuel cells, antennas and satellite communications, optoelectronics, new catalysts and coatings, smart therapeutic vectors with controlled drug delivery properties, new ultrasensitive sensors, cosmetics, smart papers, and so on. The chapter is an overview of the current state of knowledge in processing, manufacturing, characterization, and potential applications of the most common polymer nanocomposites, with a special attention to their utilizations in gas sensing [7].
Taking the above into consideration, by methods of Fourier Infrared Spectroscopy was studied the features of structural changes, which observed in the nanosystems based on aqueous solution of carboxymethyl cellulose (CMC) and Al2O3 nanoparticles, depending on changes of concentration of components.
Experimental part
IR spectra were taken with FTIR (Fourier Transform Infrared Spectrometer) Varian 640-IRspectrometrs in frequency range 4000-400 cm-1 at room temperature. The absorption spectra of the samples were obtained as form of a thin layer on the KBr boards. Two KBr prisms were used to constitute the interferometer cavity.
By varying the amount ofAl2O3 (d = 20-50 nm.) nanoparticles impacting on aqueous solution of carboxymethyl cellulose (CMC), it was developed the nanocomposites with new chemical, physico-chemical and structural-mechanical properties. For example, after nanoimpact of metal oxide nanoparticles on CMC viscosity decreased by 6-8 %.
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Study of impact of AI2O3 nanoparticles on aqueous solution of carboxymethyl cellulose (CMC)
The Al2O3 nanoparticles in different concentrations:
0.001; 0.005; 0.01; 0.05; 0.1; 0.5; 1.0 % were added to the aqueous solution (0.01 and 1.0 weight %) of carboxymethyl cellulose and after this take place changes in their chemical content and structure.
Discussion of the results
The IR absorption spectra of these samples, which differs strongly are given in the figure 1-2. Fig. 1 presents the infrared spectra of the initial compound (CMC) before and after nanoeffect. In this spectrum, it is possible to identify frequencies of absorption bands with several maximums. The grafted functional groups based on aqueous solution of carboxymethyl
cellulose (0.01 weight %) are surfactant for Al2O3 nanoparticles. Being adsorbed on the nanoparticles — water interface, CMC reduces the surface tension of water on the surface of nanoparticles, which prevents them from to aggregating into larger units. Carboxymethyl cellulose is cellulose ether. In the frequency range from 925 to 1225 cm-1 in the spectrum an intense adsorption band appears which is typical for ethers and connected with fluctuation of the C-O polar bond (Fig. 1). As can be seen from fig.1 the spectrum 2 and 3 are distinctive. The frequency range from 925 to 1225 cm-1 disappeared in the spectrum 3. It explains with destruction process, which takes place under the influense of Al2O3 nanoparticles (0.005 %).
Fig.1. IR spectrum of aqueous solution of CMC and nanosystems: 1 — aqueous solution of CMC (0.01 %); 2 — 0.01 % CMC + 0.001 % Al2O3 nanoparticles; 3 — 0.01 % CMC + 0.005 % Al2O3 nanoparticles
Fig.2. IR spectrum of aqueous solution of CMC and nanoheterogeneous systems: 1 — aqueous solution of CMC (1 %); 2 — 1 % CMC + 0.001 % Al2O3 nanoparticles; 3 — 1 % CMC + 0.005 % Al2O3 nanoparticles
Fig.3. The correlation between concentration of Al2O3 nanoparticles and optical density of nanoheterogeneous systems: 1 — aqueous solution of CMC (0.01 %); 2 — aqueous solution of CMC (1 %)
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Section 7. Materials Science
Figure 2 describes the investigation of nanoeffect on aqueous solution of CMC (1 %). As shown (Fig. 2) the concentration of Al2O3 nanoparticles influnse to the structure of CMC. In spectrum 2 observed frequency range from 925 to 1225 cm-1, which concerning to CMC, but in curve 3 these adsorption band is not founded. It explains with decomposition of nanoheterogeneous system.
Having compared Fig. 1 and Fig. 2 investigated the range of adsorption band (nIt has been obtained the nanosystems with new chemical, physico-chemical and mechanical properties by variation the amount of Al2O3 nanoparticles
(d = 20-50 nm.) impacting over aqueous solution of car-boxymethyl cellulose.
By means of IR spectroscopy method, it was determined, that the role of the Al2O3 (d = 20-50 nm.) nanoparticles is dual: at low concentrations of nanoparticles (0.001 wt. %) obtained nanostructuried materials, but at high concentrations of nanoparticles (0.005 wt. %) take place destruction of nanoheterogeneous systems.
The rheological parameters of modified CMC due to their nanostructure are improved: viscosity decreased by 6-8 %, the surface tention decreased by 5-7 %.
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