Log in

Relevant bibliographies by topics / Nanostructured sieve / Journal articles

Journal articles on the topic 'Nanostructured sieve'

To see the other types of publications on this topic, follow the link: Nanostructured sieve.

Author: Grafiati

Published: 6 September 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 45 journal articles for your research on the topic 'Nanostructured sieve.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Saravaia, Hitesh, Hariom Gupta, and Vaibhav Kulshrestha. "Single step synthesis of a magnesium doped lithium manganese oxide ion sieve nanomaterial and a SPES/ion sieve composite membrane for the separation of lithium." RSC Advances 6, no. 108 (2016): 106980–89. http://dx.doi.org/10.1039/c6ra14230c.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Yuan, Zhong-Yong, Wuzong Zhou, Viorica Parvulescu, and Bao-Lian Su. "Electron beam irradiation effect on nanostructured molecular sieve catalysts." Journal of Electron Spectroscopy and Related Phenomena 129, no. 2-3 (June 2003): 189–94. http://dx.doi.org/10.1016/s0368-2048(03)00068-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Kinka, M., J. Banys, J. Macutkevic, and A. Meskauskas. "Conductivity of nanostructured mesoporous MCM-41 molecular sieve materials." Electrochimica Acta 51, no. 27 (August 2006): 6203–6. http://dx.doi.org/10.1016/j.electacta.2006.01.069.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Mansurov, Z. A., A. R. Kerimkulova, S. A. Ibragimova, and E. Y. Gukenheimer. "Carbon Nanosorbent for Purification Different Biomolecules." Eurasian Chemico-Technological Journal 14, no. 1 (December 15, 2011): 41. http://dx.doi.org/10.18321/ectj98.

Full text

Abstract:

The article presents the results of physico-chemical studies on the development of nanostructured carbon materials from domestic raw materials. Were obtained and tested micro-mesoporous carbon sorbents for molecular-sieve chromatography of markers and investigated the applicability of carbon sorbents for the separation of protein-lipid complex, and plant bio-stimulator. Carbon sorbents have well-developed porous structure but their disadvantage is the weak mechanical<br />strength. Recently it was shown that some carbon nanostructures have enormous strength. Thus arose the need to give the nano structured elements to carbon sorbent. Creating carbon sorbents containing nanocarbon structure was the aim of our study, as these by sorbents will be very useful for large-scale purification of biomolecules.

APA, Harvard, Vancouver, ISO, and other styles

5

Kerimkulova, Almagul R., Seitkhan Azat, Zulkhair A. Mansurov, Murat K. Gilmanov, S. A. Ibragimova, Sergazy M. Аdekenov, and Bibigul B. Rachimova. "Mesoporous Nano Carbon Sorbents for Separating Different Biomolecules." Advanced Materials Research 535-537 (June 2012): 284–88. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.284.

Full text

Abstract:

The article presents the results of physico-chemical studies on the development of nanostructured carbon materials from domestic raw materials. Were obtained and tested micro-mesoporous carbon sorbents for molecular-sieve chromatography of markers and investigated the applicability of carbon sorbents for the separation of protein-lipid complex, and plant bio-stimulator.

APA, Harvard, Vancouver, ISO, and other styles

6

Kannan, Ramanujam, Kulandaivelu Karunakaran, and Samuel Vasanthkumar. "Nanostructured OMO type Manganese Oxide – as Novel Support for Palladium towards Electrooxidation of Methanol and Ethylene Glycol." Journal of New Materials for Electrochemical Systems 15, no. 4 (July 19, 2012): 249–54. http://dx.doi.org/10.14447/jnmes.v15i4.39.

Full text

Abstract:

Octahedral molecular sieve type manganese oxide (OMO) was synthesized by the ultra sonic assisted hydrothermal method, and was subsequently used as supportive material for palladium (Pd) metal towards the electrooxidation of methanol and ethylene glycol. The Pd nanoparticles were coated on the OMO by insitu reduction method. Low quantity of 5% Pd metal was used and the electrocatalytic activity was studied. The prepared OMO and the OMO/Pd nanocomposite were characterized by powder X–ray diffractogram (XRD), Scanning Electron Microscopy (SEM), Energy dispersive X–ray spectroscopy (EDS) and electrochemical methods. These studies demonstrated that the OMO can act as a good catalyst supporting material. The OMO helps to enhance the catalytic activity of Pd metal by supplying the active oxygen, which is extracted from the electrolytic solution. The electrooxidation of EG shows improved catalytic activity.

APA, Harvard, Vancouver, ISO, and other styles

7

Zhai, Qing-Zhou. "Removal of Pb (II) from Aqueous Medium by Nanostructured Mesoporous Material MCM-48: Studies on Equilibrium, Isotherm, Kinetics and Thermodynamics." Micro and Nanosystems 11, no. 2 (August 20, 2019): 123–32. http://dx.doi.org/10.2174/1876402911666190422143914.

Full text

Abstract:

Background: In recent years, with the progress of human civilization, environmental pollution is aggravating. Among them, heavy metal pollution is one of the greatest harmful water pollution problems. As a global pollution problem, heavy metal pollution, such as lead, has been given more attention by scientists. How to solve this problem, is an interesting issue. Objective: The aims of the current study are to develop the optimized adsorption conditions of Pb2+ by an MCM (Mobil Composition of Matter)-48 mesoporous molecular sieve material and study the properties of this adsorption. Method: First, an MCM-48 mesoporous molecular sieve was prepared by the hydrothermal method by using cetyltrimethylammonium as the template and tetraethyl orthosilicate as the silica source. The prepared sample was characterized by powder X-ray diffraction and scanning electron microscopy. Then, a harmful heavy metal Pb2+ was adsorbed by MCM-48. Effects of acidity, contact time, temperature, the initial concentration of lead(II) and the dosage of adsorbent on the rates of adsorption were studied, and the optimum adsorptive conditions were obtained. Results: The results show that when pH value was 4.5, the temperature was 18 ± 1°C, contact time was 40 min and m(MCM-48): m(Pb2+) = 2.5 (mass ratio), the adsorptive effect was the best, the adsorption rate was 96.71% and the adsorptive capacity was 386.84 mg/g. After the kinetic calculation, it was known that the process of the adsorption of Pb2+ by MCM-48 conforms to the pseudo-secondorder kinetic equation. Thermodynamic calculation shows that the adsorption is an exothermic process. The adsorption obeys the Freundlich adsorption isotherm equation. Nitric acid, hydrochloric acid and acetic acid were used to study the effects of desorption, indicating that the desorptive effect was the best using 0.1 mol/L of nitric acid as a desorptive agent. At the time of desorption 6 h, its desorptive ratio was the highest and reached 71.11%. Conclusion: This method is an alternative for removing harmful substances containing lead, which has a potential for application in processing lead-polluted waters.

APA, Harvard, Vancouver, ISO, and other styles

8

Goyal, Nitin, Peng Gao, Zhe Wang, Shuwen Cheng, Yong Sik Ok, Gang Li, and Liying Liu. "Nanostructured chitosan/molecular sieve-4A an emergent material for the synergistic adsorption of radioactive major pollutants cesium and strontium." Journal of Hazardous Materials 392 (June 2020): 122494. http://dx.doi.org/10.1016/j.jhazmat.2020.122494.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Mendoza-Nieto, J. A., K. D. Tejeda-Espinosa, I. Puente-Lee, C. Salcedo-Luna, and T. Klimova. "Nanostructured SBA-15 Materials as Appropriate Supports for Active Hydrodesulfurization Catalysts Prepared from HSiW Heteropolyacid." MRS Proceedings 1479 (2012): 77–82. http://dx.doi.org/10.1557/opl.2012.1601.

Full text

Abstract:

ABSTRACTA series of NiW catalysts supported on SBA-15-type materials modified with Al, Ti or Zr were prepared and tested in simultaneous hydrodesulfurization (HDS) of two model compounds: dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). Catalysts were prepared by incipient wetness impregnation of SBA-type materials (pure silica SBA-15, Al-SBA-15, Ti-SBA-15 or Zr-SBA-15) using Keggin-type heteropolyacid H4SiW12O40 as active phase precursor and nickel nitrate. Nominal composition of the catalysts was 19 wt.% of WO3 and 3 wt.% of NiO. The supports and catalysts were characterized by SEM-EDX, N2physisorption, small-angle and powder XRD, UV-Vis DRS, TPR and HRTEM. It was shown that a good dispersion of Al, Ti and Zr species on the SBA-15 surface was reached. The characteristic structure of the SBA-15 support was preserved in all supports and NiW catalysts. Addition of metal atoms (Al, Ti, Zr) on the SBA-15 surface prior to catalysts’ preparation improved dispersion of Ni and W oxide species in calcined catalysts. HRTEM characterization of sulfided catalysts showed that the dispersion of NiW active phase was also better on metal-containing SBA-15 supports than on the pure silica one. All NiW catalysts supported on metal-containing SBA-15 materials showed an outstanding catalytic performance in HDS of both model compounds used (DBT and 4,6-DMDBT). A good correlation was found between the dispersion of sulfided NiW active phase and catalytic activity results. The highest HDS activity was obtained with the NiW catalyst supported on Zr-containing SBA-15 molecular sieve, which makes it a promising catalytic system for ultra-deep hydrodesulfurization of diesel fuel.

APA, Harvard, Vancouver, ISO, and other styles

10

Aleksic, Obrad, and Pantelija Nikolic. "Recent advances in NTC thick film thermistor properties and applications." Facta universitatis - series: Electronics and Energetics 30, no. 3 (2017): 267–84. http://dx.doi.org/10.2298/fuee1703267a.

Full text

Abstract:

An introduction to thermal sensors and thermistor materials is given in brief. After that novel electrical components such as thick film thermistors and thermal sensors based on them are described: Custom designed NTC thermistor pastes based on nickel manganite NiM2O4 micro/nanostructured powder were composed and new planar cell-based (segmented) constructions were printed on alumina. The thick film segmented thermistors were used in novel thermal sensors such as anemometers, water flow meters, gradient temperature sensor of the ground, and other applications. The advances achieved are the consequence of previous improvements of thermistor material based on nickel manganite and modified nickel manganite such as Cu0.2Ni0.5Zn1.0Mn1.3O4 and optimization of thick film thermistor geometries for sensor applications. The thermistor powders where produced by a solid state reaction of MnCO3, NiO, CuO, ZnO powders mixed in proper weight ratio. After calcination the obtained thermistor materials were milled in planetary ball mils, agate mills and finally sieved by 400 mesh sieve. The powders were characterized by XRD and SEM. The new thick film pastes where composed of the powders achieved, an organic vehicle and glass frit. The pastes were printed on alumina, dried and sintered and characterized again by XRD, SEM and electrical measurements. Different thick film thermistor constructions such as rectangular, sandwich, interdigitated and segmented were printed of new thermistor pastes. Their properties such as electrical resistance of the thermistor samples where mutually compared. The electrode effect was measured for all mentioned constructions and surface resistance was determined. It was used for modeling and realizations of high, medium and low ohmic thermistors with different power dissipation and heat loss. Finally all the results obtained lead to thermal sensors based on heat loss for measuring the air flow, water flow, temperature gradient and heat transfer from the air to the ground.

APA, Harvard, Vancouver, ISO, and other styles

11

Aghaei, Erfan, and Mohammad Haghighi. "Effect of crystallization time on properties and catalytic performance of nanostructured SAPO-34 molecular sieve synthesized at high temperatures for conversion of methanol to light olefins." Powder Technology 269 (January 2015): 358–70. http://dx.doi.org/10.1016/j.powtec.2014.09.036.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Zhang, Qin-Hui, Shao-Peng Li, Shu-Ying Sun, Xian-Sheng Yin, and Jian-Guo Yu. "Lithium selective adsorption on 1-D MnO2 nanostructure ion-sieve." Advanced Powder Technology 20, no. 5 (September 2009): 432–37. http://dx.doi.org/10.1016/j.apt.2009.02.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Zandevakili, Saeed, Mohammad Ranjbar, and Maryam Ehteshamzadeh. "Synthesis of a nanostructure ion sieve with improved lithium adsorption capacity." Micro & Nano Letters 9, no. 7 (July 2014): 455–59. http://dx.doi.org/10.1049/mnl.2014.0086.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Yuan, Jikang, Wei-Na Li, Sinue Gomez, and Steven L. Suib. "Shape-Controlled Synthesis of Manganese Oxide Octahedral Molecular Sieve Three-Dimensional Nanostructures." Journal of the American Chemical Society 127, no. 41 (October 2005): 14184–85. http://dx.doi.org/10.1021/ja053463j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Vaschetti, Virginia M., Belén M. Viola, Deicy Barrera, Karim Sapag, Griselda A. Eimer, Analía L. Cánepa, and Sandra G. Casuscelli. "Improved template – ion exchange synthesis of Cu-nanostructured molecular sieves." Microporous and Mesoporous Materials 284 (August 2019): 410–20. http://dx.doi.org/10.1016/j.micromeso.2019.04.037.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Borgschulte, A., E. Callini, N. Stadie, Y. Arroyo, M. D. Rossell, R. Erni, H. Geerlings, A. Züttel, and D. Ferri. "Manipulating the reaction path of the CO2 hydrogenation reaction in molecular sieves." Catalysis Science & Technology 5, no. 9 (2015): 4613–21. http://dx.doi.org/10.1039/c5cy00528k.

Full text

Abstract:

We demonstrate that the kinetics of the Sabatier reaction catalysed by sorption catalysts depends on the nanostructure of the catalyst–sorbent system, and in particular on the shape selectivity of the zeolite sorbent.

APA, Harvard, Vancouver, ISO, and other styles

17

Al-Ani, Aqeel, Josiah J. C. Haslam, Natalie E. Mordvinova, Oleg I. Lebedev, Aurélie Vicente, Christian Fernandez, and Vladimir Zholobenko. "Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites." Nanoscale Advances 1, no. 5 (2019): 2029–39. http://dx.doi.org/10.1039/c9na00004f.

Full text

Abstract:

Zeolites and related crystalline molecular sieves are utilised in a wide range of reactions and processes due to their regular microporous structure, strong acidity, shape selectivity and ion-exchange properties.

APA, Harvard, Vancouver, ISO, and other styles

18

Zandevakili, S., M. Ranjbar, and M. Ehteshamzadeh. "Recovery of lithium from Urmia Lake by a nanostructure MnO 2 ion sieve." Hydrometallurgy 149 (October 2014): 148–52. http://dx.doi.org/10.1016/j.hydromet.2014.08.004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Espinal, Anais E., Lichun Zhang, Chun-Hu Chen, Aimee Morey, Yuefeng Nie, Laura Espinal, Barrett O. Wells, Raymond Joesten, Mark Aindow, and Steven L. Suib. "Nanostructured arrays of semiconducting octahedral molecular sieves by pulsed-laser deposition." Nature Materials 9, no. 1 (November 1, 2009): 54–59. http://dx.doi.org/10.1038/nmat2567.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Kouznetsova, T. F., V. Е. Agabekov, A. I. Ivanets, E. V. Karpinchik, and J. D. Sauka. "Synthesis of mesoporous silica with ordered nanostructural morphology from natural quartz sand." Doklady of the National Academy of Sciences of Belarus 64, no. 5 (November 5, 2020): 544–50. http://dx.doi.org/10.29235/1561-8323-2020-64-5-544-550.

Full text

Abstract:

Silica with ordered nanostructured morphology characteristic of mesoporous molecular sieves with cubic packing of cylindrical pores and a three-dimensional porous structure is obtained from natural quartz sand. It was shown by X-ray diffraction, scanning electron microscopy, and low-temperature nitrogen adsorption-desorption that the obtained silica material is thermally stable, amorphous, consists of submicron grains, has a high specific surface area of 1396 m2/g, a pore volume of 0.780 cm3/g and an average diameter of 2.2 nm with a narrow size distribution of mesopores.

APA, Harvard, Vancouver, ISO, and other styles

21

Li, Wei-Na, Jikang Yuan, Sinue Gomez-Mower, Shantakumar Sithambaram, and Steven L. Suib. "Synthesis of Single Crystal Manganese Oxide Octahedral Molecular Sieve (OMS) Nanostructures with Tunable Tunnels and Shapes." Journal of Physical Chemistry B 110, no. 7 (February 2006): 3066–70. http://dx.doi.org/10.1021/jp0553380.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Radnik, Jörg, Thi Thuy Hanh Dang, Suresh Gatla, Vikram Singh Raghuwanshi, Dragomir Tatchev, and Armin Hoell. "Identifying the location of Cu ions in nanostructured SAPO-5 molecular sieves and its impact on the redox properties." RSC Advances 9, no. 12 (2019): 6429–37. http://dx.doi.org/10.1039/c8ra10417d.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Zhang, Qin Hui, Shao Peng Li, Shu Ying Sun, Xian Sheng Yin, and Jian Guo Yu. "Synthesis and Characterization of Titania Nanoribbons for Lithium Selective Adsorption." Materials Science Forum 610-613 (January 2009): 14–20. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.14.

Full text

Abstract:

Mesoporous titania nanoribbons are synthesized via an optimized soft hydrothermal process and the derived titania ion-sieves with lithium selective adsorption property are accordingly prepared via a simple solid-phase reaction between Li2CO3 and TiO2 nanomaterials followed by the acid treatment process to extract lithium from the Li2TiO3 ternary oxide precursors. The physical chemistry structure are characterized by XRD, TEM/HRTEM, SAED and N2 adsorption-desorption analysis; and the lithium selective adsorption properties are tested by the adsorption isotherm measurement and demonstrated with the distribution coefficient of a series of alkaline and alkaline-earth metal ions. Though the high temperature calcinations and lithium insertion-extraction process resulted in the agglomeration of nanostructure to large bulky particles, it implied that that the low-dimensional titania nanoribbons might be functionalized to lithium ion-sieves with remarkable adsorption capacity and selectivity, promising in the utilization of lithium extraction from aqueous resources including brine or seawater.

APA, Harvard, Vancouver, ISO, and other styles

24

Zhao, Chun Xia, Yun Xia Yang, Wen Chen, Dong Yuan Zhao, Huan Ting Wang, and Paul Webley. "Graphitic N-Free/N-Doped Nanostructured Carbon Molecular Sieves via CVD Method and their Hydrogen Storage." Advanced Materials Research 66 (April 2009): 179–82. http://dx.doi.org/10.4028/www.scientific.net/amr.66.179.

Full text

Abstract:

Graphitic N-free and N-doped carbon molecular sieves were prepared using zeolite NaY as a template via one-step chemical vapor deposition method (CVD) with propylene and acetonitrile as N-free and N-doped carbon precursors, respectively. The morphology, structure and properties of the carbons prepared were characterized via XRD, SEM, TEM and adsorption measurements. A large proportion of pore volume is associated with micropores in the carbons prepared. A high hydrogen uptake capacity is observed.

APA, Harvard, Vancouver, ISO, and other styles

25

Cánepa, Analía L., Corina M. Chanquía, Virginia M. Vaschetti, Griselda A. Eimer, and Sandra G. Casuscelli. "Biomass toward fine chemical products: Oxidation of α-pinene over sieves nanostructured modified with vanadium." Journal of Molecular Catalysis A: Chemical 404-405 (August 2015): 65–73. http://dx.doi.org/10.1016/j.molcata.2015.04.009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Berveno, A. V., V. P. Berveno, M. A. Bondarenko, E. O. Pentsak, and S. Yu Lyrshchikov. "Interrelation of sorption properties and nanostructure of carbon molecular sieves from anthracites of Kuzbass." Physics of Particles and Nuclei Letters 8, no. 10 (December 2011): 1037–39. http://dx.doi.org/10.1134/s1547477111100050.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Milinskiy, Alexey Yurievich, Anton Anatolеvich Antonov, and Sergey Vasilevich Baryshnikov. "Dielectric Studies of Ammonium Hydrogen Sulphate (NH₄HSO₄), Embedded into Molecular Sieves SBA-15." Solid State Phenomena 247 (March 2016): 85–90. http://dx.doi.org/10.4028/www.scientific.net/ssp.247.85.

Full text

Abstract:

Temperature dependencies of linear dielectric permittivity and third harmonic coefficient of nanoporous matrices SBA-15 with channel pore size of 7,5 nm filled with ferroelectric NH4HSO4 compared to bulk ammonium hydrogen sulphate were studied. The measurements were performed in a heating and cooling mode with a temperature range from 100 K to room temperature. Low-temperature phase transition shift of 7-8 degrees to low temperatures was found for nanostructured ammonium hydrogen sulphate compared to bulk NH4HSO4. The experimental data were treated within the framework of the models developed for isolated small ferroelectric particles and arrays of coupled particles. The rise of the space charge polarization effects was also observed.

APA, Harvard, Vancouver, ISO, and other styles

28

Zablocka, Izabela, Monika Wysocka-Zolopa, and Krzysztof Winkler. "Electrochemical Detection of Dopamine at a Gold Electrode Modified with a Polypyrrole–Mesoporous Silica Molecular Sieves (MCM-48) Film." International Journal of Molecular Sciences 20, no. 1 (December 29, 2018): 111. http://dx.doi.org/10.3390/ijms20010111.

Full text

Abstract:

A gold electrode modified with a polypyrrole–mesoporous silica molecular sieves (polypyrrole—MCM-48) nanostructure film was used for the electrochemical determination of small concentrations of dopamine (DA) by cyclic voltammetry and square-wave voltammetry techniques. This electrode showed good electrocatalytic activity for the oxidation of dopamine. The oxidation potential of dopamine was decreased significantly compared with that obtained at the bare gold electrode. The observed linear range for the determination of the dopamine concentration, without interferents through cyclic voltammetry measurements, was from 10 μM to 1.2 mM (R2 = 0.9989) for the gold electrode modified with the polypyrrole—MCM-48 nanostructure, with a detection limit of 2.5 μM. In the case of square-wave voltammetry, the linear range was 2–250 μM, with a correlation coefficient of 0.9996, and the detection limit was estimated to be 0.7 μM. The effects of interferents, such as ascorbic acid (AA) and uric acid (UA), on the electrochemical detection of dopamine were also examined. The modified electrode can successfully separate the oxidation potentials for ascorbic acid and dopamine, shifting the oxidation peak potential of ascorbic acid to a more positive potential, and significantly decreasing the peak current. The presence of ascorbic acid increased the sensitivity of dopamine determination at the modified electrode, and the detection limit was estimated to be 0.5 μM with 0.1 mM ascorbic acid to imitate physiological solutions. Additionally, studies showed that the presence of uric acid does not affect the electrochemical detection of dopamine. The modified electrode can be successfully applied for the quantitative analysis of dopamine both with and without interferents.

APA, Harvard, Vancouver, ISO, and other styles

29

Elsabawy, Khaled M. "Synthesis and 3D-AFM surface topology of nanographene-like material extracted from sulfonated tri-, di- and monochloroacetic acid." Materials Science-Poland 34, no. 3 (September 1, 2016): 627–32. http://dx.doi.org/10.1515/msp-2016-0081.

Full text

Abstract:

AbstractIn this study a graphene-like material was synthesized by chemical exfoliation of sieved graphite powder with an average particles size ≤100 µm in dispersing medium from tri-, di- and monochloroacetic acid sulfonated with 55 % H2SO3. The results indicated that the yield of graphene-like material was the best in case of trichloroacetic 55 % H2SO3, taking into account structure quality and amount of obtained material. Layered graphene-like material was carefully collected after reduction of GO formed by 50 % dimethylhydrazine. AFM-investigations were performed to characterize nanostructural features of produced graphene and expected surface area which is surface topology dependent. Furthermore, Raman spectra were measured to confirm graphene formation.

APA, Harvard, Vancouver, ISO, and other styles

30

Cyganiuk, Aleksandra W., Roman Klimkiewicz, Andrzej Olejniczak, Anna Kucińska, and Jerzy P. Łukaszewicz. "Nanoscale Phenomena Occurring during Pyrolysis of Salix viminalis Wood." Journal of Materials 2013 (April 10, 2013): 1–9. http://dx.doi.org/10.1155/2013/206952.

Full text

Abstract:

Selective utilisation of unique properties of Salix viminalis wood enables preparation of materials of nanotechnologic properties. Thermal decomposition of lignin-cellulose organic matter results in the formation of a nanostructured porous carbon matrix (charcoal). Narrowed pore size distribution (PSD) in the subnanometer range allows to consider the charcoals as carbon molecular sieves (CMSs), which are capable of separating even chemically inert gases like neon, krypton, and nitrogen. High tolerance of Salix viminalis to heavy metal ions enables enriching living plant tissues with metal ions like lanthanum and manganese. Such ions may later form LaMnO3 with parallel transformation of plant tissues (organic matter) to carbon matrix using a heat treatment. In this way, one gets a hybrid material: a porous carbon matrix with uniformly suspended nanocrystallites of LaMoO3. The crystallites are in the catalytically active phase during the conversion of n-butanol to heptanone-4 with high yield and selectivity.

APA, Harvard, Vancouver, ISO, and other styles

31

Zhou, Pengchao, Tengda Hu, Yachen Xu, Xiang Li, Wei Shi, Yang Lin, Tao Xu, and Bin Wei. "Biomimetic Superhydrophobic Films with an Extremely Low Roll-Off Angle Modified by F16CuPc via Two-Step Fabrication." Nanomaterials 12, no. 6 (March 14, 2022): 953. http://dx.doi.org/10.3390/nano12060953.

Full text

Abstract:

Superhydrophobicity is the phenomenon of which the water contact angle (WCA) of droplets on a solid surface is greater than 150°. In the present paper, we prepare a superhydrophobic film with a structure similar to the surface of a lotus leaf, which is composed of polydimethylsiloxane (PDMS), zinc oxide (ZnO), a molecular sieve (MS) and 1,2,3,4,8,9,10,11,15,16,17,18,22,23,24,25-hexadecafluorophthalocyanine copper(II) (F16CuPc). The F16CuPc was used as the modifier to reduce the surface energy of the biomimetic micro-nanostructure. With the introduction of F16CuPc, the superhydrophobic properties of the surface were enhanced so that the WCA and water roll-off angle could reach 167.1° and 0.5°, respectively. Scanning electron microscopy, X-ray energy spectrometry, and X-ray photoelectron spectroscopy analyses verified that the enhanced superhydrophobic properties of the film were mainly attributed to the modification of F16CuPc. Finally, thermal, mechanical, and chemical stability studies, as well as the influences of UV and underwater immersion on the superhydrophobic film were investigated. This developed two-step fabrication method may be a potential direction for superhydrophobic surface fabrication due to its simple process, excellent superhydrophobic property, and favorable stability.

APA, Harvard, Vancouver, ISO, and other styles

32

Al Tameemi, Mustafa Basim M., Raluca Stan, Viorel Prisacari, Georgeta Voicu, Marcela Popa, Mariana Carmen Chifiriuc, Cristina Ott, George Marton, and Aurelia Meghea. "Antimicrobial performance of nanostructured silica–titania sieves loaded with izohidrafural against microbial strains isolated from urinary tract infections." Comptes Rendus Chimie 20, no. 5 (May 2017): 475–83. http://dx.doi.org/10.1016/j.crci.2016.09.007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Iyer, Aparna, Chung-Hao Kuo, Saminda Dharmarathna, Zhu Luo, Dinithi Rathnayake, Junkai He, and Steven L. Suib. "An ultrasonic atomization assisted synthesis of self-assembled manganese oxide octahedral molecular sieve nanostructures and their application in catalysis and water treatment." Nanoscale 9, no. 15 (2017): 5009–18. http://dx.doi.org/10.1039/c6nr09093a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Zolotarenko, O. D., E. P. Rudakova, A. D. Zolotarenko, N. Y. Akhanova, M. N. Ualkhanova, D. V. Shchur, M. T. Gabdullin, et al. "Platinum-containing carbon nanostructures for the creation of electrically conductive ceramics using 3D printing of CJP technology." Himia, Fizika ta Tehnologia Poverhni 13, no. 3 (September 30, 2022): 259–73. http://dx.doi.org/10.15407/hftp13.03.259.

Full text

Abstract:

Carbon nanostructures (CNS) were synthesized by the electric arc plasma chemical method during the evaporation of a high-quality graphite electrode of the brand “fine-grained dense graphite” (FGDG-7) filled with a catalyst (Pt), which was evaporated in a helium environment. In the synthesis process, the following were synthesized: multi-walled (MWCNT) and single-walled carbon nanotubes (SWCNT), fullerenes, graphene packets and nanocomposites. A deposit in the form of growth on the cathode electrode was also synthesized. All synthesis products were analyzed at the micro- and nanolevels, which made it possible to analyze the influence of platinum vapors on the formation of carbon nanomaterials (CNM). The non-uniform distribution of catalyst atoms (platinum) in the products of electrochemical synthesis in a gas medium using FGDG-7 graphite was investigated. During the analysis, it was found that platinum is in the state of the face-centered cubic (FCC) lattice and is distributed in the synthesis products as follows: the core of the deposit is less than < 0.001 %, the shell of the deposit is less than < 1 %, the wall soot is more than > 1 %. The morphology and composition of the platinum deposit, which has a hexagonal graphite structure with an admixture of a rhombohedral graphite phase, was studied. In the studies, differential thermal analysis in air (TG, DTG, DTA) was carried out, which made it possible to identify the composition of the synthesis products. It is an established fact that the parts of the deposit with platinum are more heat-resistant compared to the deposit components that do not contain Pt. The resulting carbon nanotubes (CNTs) in diameter (5–25 nm) and length (1.5–2 μm) do not differ from those obtained without the participation of platinum, except for some anomalies. When studying the suitability of platinum-containing carbon nanostructures for 3D printing of CJP (ceramic printing) technology, it was found that for the use of platinum-containing carbon black, it is necessary to carry out a preliminary short-term treatment, namely, grinding in special “ball mills” or rubbing through a fine sieve with minimal effort to create uniformity product. Previous studies have shown that such platinum-containing carbon nanostructures can already be used in 3D printing of CJP technology, or to create new composites for 3D printing technologies of FDM, SLA.

APA, Harvard, Vancouver, ISO, and other styles

35

Kane, Michael S., Jesse F. Goellner, Henry C. Foley, Remo DiFrancesco, Simon J. L. Billinge, and Lawrence F. Allard. "Symmetry Breaking in Nanostructure Development of Carbogenic Molecular Sieves: Effects of Morphological Pattern Formation on Oxygen and Nitrogen Transport." Chemistry of Materials 8, no. 8 (January 1996): 2159–71. http://dx.doi.org/10.1021/cm960085w.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Raskosha, O. V., N. N. Starobor, and L. А. Bashlykova. "Assessment of biological safety of graphene nanostructures in vivo: literature review." Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences 5 (2021): 35–45. http://dx.doi.org/10.19110/1994-5655-2021-5-35-45.

Full text

Abstract:

Graphene is a flat monoatomic layer of carbon arranged in a two-dimensional crystalline struc¬ture. The active study of graphene is growing exponentially, attracting scientists from various fields of science. Graphene-based nanomaterials have unique physical and chemical properties suitable for diverse applications in electronics, telecommunications, ener-gy, healthcare and ecology. There is also an increasing interest in the biomedical application of graphene nanomaterials. However, a significant obstacle to the wider practical use of graphene and materials based on it remains the lack of an unambiguous answer to the question of their potential danger. The paper presents a review of the literature on the study of the biological safety of graphene-based nano-materials in vivo using mice and rats as test objects, as a generally accepted human model. The scientific community has identified the need for a more detailed study of the tox¬icity of graphene and materials based on it, with the mandatory identification of the relationship between their characteristics and biological effi¬ciency. In studies on the whole organism, the biological effect depends not only on the chemi¬cal nature of nanomaterials, but also on the dose, route of administration, the time and mode of exposure, as well as on the animals used for testing. In addition, given the possible toxic effect of graphene-based nanoparticles, it is nec¬essary to investigate and critically assess the potential long-term risks. A detailed comprehen¬sive assessment of the biological safety of graphene nanostructures will contribute to the advancement of knowledge necessary for the de¬velopment of safe graphene-based technologies and products suitable for medical applications, and to minimize risks to human health.

APA, Harvard, Vancouver, ISO, and other styles

37

Albuquerque, A., C. Vautier-Giongo, and H. O. Pastore. "Physical chemistry of nanostructured molecular sieves by the study of phase diagrams: the case of the cetyltrimethylammonium bromide–tetramethylammonium silicate–water system." Journal of Colloid and Interface Science 284, no. 2 (April 2005): 687–93. http://dx.doi.org/10.1016/j.jcis.2004.10.065.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Hoang, Thu Thi, and Trung Quang Tran. "Investigating the effect of capping agent PVP on the synthesis of silver nanowires by polyol method and its application as flexible transparent conducting electrode." Science and Technology Development Journal 16, no. 4 (December 31, 2013): 52–60. http://dx.doi.org/10.32508/stdj.v16i4.1596.

Full text

Abstract:

In this report, we present a rapid and efficient polyol method - the solution-phase approach for the large scale synthesis of silver nanowires with diameters in the range of 40 - 50 nm, and lengths up to 20 μm. Although the polyol process is a popular method of preparing metal nanostructures, so far most of the published works mainly focused on the synthesis process regardless of amount of surfactants. In this article, we successfully synthesized large-scale uniform silver nanowires with high aspect ratios by introducing the long-chain PVP (MW = 58 000) and investigated the effect of the amount of PVP on the synthesis of Ag nanowires by studying their morphologies, structures and optical properties. The dependency of nanowire morphology and aspect ratio on synthesis parameters was shown via SEM images. The diameter of nanowires decreased when the molar ratio of PVP to silver nitrate was increased. Further more, the molar ratios decided the morphology (particle, rod or wire) of the Silve solution. Synthesized silver nanowires were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). This aqueous dispersions of silver nanowires were used to prepare thin, flexible, transparent, conducting films on polyethylene terephthalate substrate (PET) by spraying method. The prepared silver nanowire films on PET substrate had a transparency of 82% and sheet resistance of 10 Ω/□.

APA, Harvard, Vancouver, ISO, and other styles

39

Zhang, Qin-Hui, Shao-Peng Li, Shu-Ying Sun, Xian-Sheng Yin, and Jian-Guo Yu. "Nanostructure Ion-Sieves for Lithium Adsorption." International Journal of Chemical Reactor Engineering 5, no. 1 (December 31, 2007). http://dx.doi.org/10.2202/1542-6580.1492.

Full text

Abstract:

This paper highlights our recent work on preparation and characterization of nanostructure transition metal (Me) oxide (Me = Mn, Ti and Zr) ion-sieves. The controlled hydrothermal and Sol-Gel method have been developed in the synthesis of ion-sieves by the acid treatment of Li-Me-O tri-oxide precursors. The structure characteristic and ion-exchange property are studied by XRD, TEM, nitrogen adsorption-desorption analysis, lithium ion adsorptive isotherm and kinetics measurement. The result shows that these transition metal oxide ion-sieves, promising in the lithium extraction from brine or seawater, have good selectivity and remarkable adsorption capacity for lithium ions. The maximum adsorption capacity of manganese dioxide and titania by now is 3.47 and 4.02 mmol/g, respectively. The adsorption capacity of zirconia ion-sieve is only 0.675 mmol/g. To the best of our knowledge there is no other report on zirconia with the lithium adsorption property up-to-date.

APA, Harvard, Vancouver, ISO, and other styles

40

Fan, Hongyou, Gabriel P. López, and C. Jeffrey Brinker. "Rapid Prototyping of Patterned Multifunctional Nanostructures." MRS Proceedings 624 (2000). http://dx.doi.org/10.1557/proc-624-231.

Full text

Abstract:

ABSTRACTThe ability to engineer ordered arrays of objects on multiple length scales has potential for applications such as microelectronics, sensors, wave guides, and photonic lattices with tunable band gaps. Since the invention of surfactant templated mesoporous sieves in 1992, great progress has been made in controlling different mesophases in the form of powders, particles, fibers, and films. To date, although there have been several reports of patterned mesostructures, materials prepared have been limited to metal oxides with no specific functionality. For many of the envisioned applications of hierarchical materials in micro-systems, sensors, waveguides, photonics, and electronics, it is necessary to define both form and function on several length scales. In addition, the patterning strategies utilized so far require hours or even days for completion. Such slowprocesses are inherently difficult to implement in commercial environments. We present a series of new methods of producing patterns within seconds. Combining sol-gel chemistry, Evaporation-Induced Self-Assembly (EISA), and rapid prototyping techniques like pen lithography, ink-jet printing, and dip-coating on micro-contact printed substrates, we form hierarchically organized silica structures that exhibit order and function on multiple scales: on the molecular scale, functional organic moieties are positioned on pore surfaces, on the mesoscale, mono-sized pores are organized into 1-, 2-, or 3-dimensional networks, providing size-selective accessibility from the gas or liquid phase, and on the macroscale, 2-dimensional arrays and fluidic or photonic systems may be defined. These rapid patterning techniques establish for the first time a link between computer-aided design and rapid processing of self-assembled nanostructures

APA, Harvard, Vancouver, ISO, and other styles

41

Fan, Hongyou, Gabriel P. Laópez, and C. Jeffrey Brinker. "Rapid Prototyping of Patterned Multifunctional Nanostructures." MRS Proceedings 625 (2000). http://dx.doi.org/10.1557/proc-625-141.

Full text

Abstract:

AbstractThe ability to engineer ordered arrays of objects on multiple length scales has potential for applications such as microelectronics, sensors, wave guides, and photonic lattices with tunable band gaps. Since the invention of surfactant templated mesoporous sieves in 1992, great progress has been made in controlling different mesophases in the form of powders, particles, fibers, and films. To date, although there have been several reports of patterned mesostructures, materials prepared have been limited to metal oxides with no specific functionality. For many of the envisioned applications of hierarchical materials in micro-systems, sensors, waveguides, photonics, and electronics, it is necessary to define both form and function on several length scales. In addition, the patterning strategies utilized so far require hours or even days for completion. Such slow processes are inherently difficult to implement in commercial environments. We present a series of new methods of producing patterns within seconds. Combining sol-gel chemistry, Evaporation-Induced Self-Assembly (EISA), and rapid prototyping techniques like pen lithography, ink-jet printing, and dip-coating on micro-contact printed substrates, we form hierarchically organized silica structures that exhibit order and function on multiple scales: on the molecular scale, functional organic moieties are positioned on pore surfaces, on the mesoscale, mono-sized pores are organized into 1-, 2-, or 3-dimensional networks, providing size-selective accessibility from the gas or liquid phase, and on the macroscale, 2-dimensional arrays and fluidic or photonic systems may be defined. These rapid patterning techniques establish for the first time a link between computer-aided design and rapid processing of self-assembled nanostructures.

APA, Harvard, Vancouver, ISO, and other styles

42

Su, J., M. Gherasimova, G. Cui, J. Han, S. Lim, D. Ciuparu, L. Pfefferle, et al. "Vapor-liquid-solid Growth of III-Nitride Nanowires and Heterostructures by Metal-Organic Chemical Vapor Deposition." MRS Proceedings 831 (2004). http://dx.doi.org/10.1557/proc-831-e12.4.

Full text

Abstract:

ABSTRACTWe report flexible synthesis of III-Nitride nanowires and heterostructures by metal-organic chemical vapor deposition (MOCVD) via a catalytic vapor-liquid-solid (VLS) growth mechanism. Indium is used as an in-situ catalyst to facilitate and sustain the stability of liquid phase droplet for VLS growth based on thermodynamic consideration. The employment of mesoporous molecular sieves (MCM-41) helps to prevent the coalescence of catalyst droplets and to promote nucleation statistics. Cathodoluminescence (CL) of GaN nanowires shows near band-edge emission at 370nm, and strong E2 phonon peak is observed at room temperature in Raman scattering spectra. Both binary GaN and AlN nanowires have been synthesized by MOCVD. Three-dimensional AlN/GaN trunk-branch nanostructures are reported to illustrate the versatility of incorporating the VLS mechanism into MOCVD process.

APA, Harvard, Vancouver, ISO, and other styles

43

Malekian, Fariba, H. GHAFOURIAN, K. ZARE, A. A. SHARIF, and Y. ZAMANI. "Surface Characteristics of Different Wood and Coal-Based Activated Carbons for Preparation of Carbon Molecular Sieve." Journal of the Mexican Chemical Society 63, no. 2 (June 12, 2019). http://dx.doi.org/10.29356/jmcs.v63i2.666.

Full text

Abstract:

Abstract. In this study, four different nanostructures precursors, pistachio wood, walnuts wood, forest wood and coal (Anthracite) were selected to produce activated carbon. The experiments were done in industrial scale using a rotary furnace with temperature between 850 and 920 ºC for 45 minutes followed by steam. The product was grounded and divided in three particle sizes, 8x30, 30x50, and 60x80 meshes. The physical properties and surface chemistry of the activated carbon samples were determined by imaging of BET-N2 adsorption. The results obtained from measurements of iodine and methylene blue numbers, surface area, pore volume and comparison of surface area and pore volume, show that by decreasing of particle sizes of each sample, increase the surface area and micro pore volumes significantly. The magnitude of changes in surface area with particle size is a significant factor in defining the effectiveness and suitability of an activated carbon for the production of carbon molecular sieve. Our results indicate that the highest pore volume belongs to pistachio wood, which was increased from 0.168 to 0.271 cm3/g from 8x30 to 60x80 mesh. Resumen. En este estudio, se seleccionaron cuatro precursores de nanoestructuras diferentes, madera de pistache, madera de nueces, madera de bosque y carbón (antracita) para producir carbón activado. Los experimentos se realizaron a escala industrial utilizando un horno rotatorio con una temperatura entre 850 y 920 ºC durante 45 minutos, seguido de vapor. El producto se molió y se dividió en tres tamaños de partículas, en mallas de 8x30, 30x50 y 60x80. Las propiedades físicas y la química de la superficie de las muestras de carbón activado se determinaron mediante imágenes de la adsorción de BET-N2. Los resultados obtenidos de las mediciones de los números de yodo y azul de metileno, área de superficie, volumen de poros y comparación de área de superficie y volumen de poros muestran que, al disminuir los tamaños de partícula de cada muestra, aumenta significativamente el área de superficie y los volúmenes de microporos. La magnitud de los cambios en el área de la superficie con el tamaño de partícula es un factor significativo en la definición de la efectividad y la idoneidad de un carbón activado para la producción de tamiz molecular de carbono. Nuestros resultados indican que el mayor volumen de poros pertenece a la madera de pistache, que aumentó de la malla de 0.168 a 0.271 cm3/g de 8x30 a 60x80.

APA, Harvard, Vancouver, ISO, and other styles

44

Sadeghpour, Parisa, Mohammad Haghighi, and Mehrdad Esmaeili. "Structural/Texture Evolution During Facile Substitution of Ni into ZSM-5 Nanostructure vs. its Impregnation Dispersion Used in Selective Transformation of Methanol to Ethylene and Propylene." Combinatorial Chemistry & High Throughput Screening 23 (August 25, 2020). http://dx.doi.org/10.2174/1386207323666200825144543.

Full text

Abstract:

Aim and Objective: Effect of two different modification methods for introducing Ni into ZSM-5 framework was investigated under high temperature synthesis conditions. The nickel successfully introduced into the MFI structures at different crystallization conditions to enhance the physicochemical properties and catalytic performance. Materials and Methods: A series of impregnated Ni/ZSM-5 and isomorphous substituted NiZSM-5 nanostructure catalysts were prepared hydrothermally at different high temperatures and within short times. X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Energy dispersive X-ray (EDX), Brunner, Emmett and Teller-Barrett, Joyner and Halenda (BET-BJH), Fourier transform infrared (FTIR) and Temperature-programmed desorption of ammonia (TPDNH3) were applied to investigate the physicochemical properties. Results: Although all the catalysts showed pure silica MFI–type nanosheets and coffin-like morphology, using the isomorphous substitution for Ni incorporation into the ZSM-5 framework led to the formation of materials with lower crystallinity, higher pore volume and stronger acidity compared to using impregnation method. Moreover, it was found that raising the hydrothermal temperature increased the crystallinity and enhanced more uniform incorporation of Ni atoms in the crystalline structure of catalysts. TPD-NH3 analysis demonstrated that high crystallization temperature and short crystallization time of NiZSM-5(350-0.5) resulted in fewer weak acid sites and medium acid strength. The MTO catalytic performance was tested in a fixed bed reactor at 460ºC and GHSV=10500 cm3 /gcat.h. A slightly different reaction pathway was proposed for the production of light olefins over impregnated Ni/ZSM-5 catalysts based on the role of NiO species. The enhanced methanol conversion for isomorphous substituted NiZSM-5 catalysts could be related to the most accessible active sites located inside the pores. Conclusion: The impregnated Ni/ZSM-5 catalyst prepared at low hydrothermal temperature showed the best catalytic performance, while the isomorphous substituted NiZSM-5 prepared at high temperature was found to be the active molecular sieve regarding the stability performance.

APA, Harvard, Vancouver, ISO, and other styles

45

Aghamohammadi, Sogand, Mohammad Haghighi, Parisa Sadeghpour, and Tayebeh Souri. "Comparative Synthesis and Characterization of Nanostructured SAPO-34 Using TEA and Morpholine: Effect of Mono vs. Dual Template on Catalytic Properties and Performance toward Methanol to Light Olefins." Combinatorial Chemistry & High Throughput Screening 23 (September 14, 2020). http://dx.doi.org/10.2174/1386207323666200914104904.

Full text

Abstract:

Aim and Objective: Production of light olefins from methanol was studied over SAPO-34 molecular sieves exploring the effect of mono and dual templates. Herein, the single templates of TEA, morpholine and mixed template of TEA/morpholine (equal molar ratio of TEA and morpholine) were used to synthesize SAPO-34 catalysts. Materials and Methods: The prepared samples were prepared via hydrothermal synthesis method and characterized with XRD, FESEM, PSD, EDX, BET and FTIR techniques. Results: It was found that the crystallinity decreased upon applying TEA as template and also it can be noted that the intensity of the SAPO-34 phase peaks increased by increasing the morpholine in template mixture. Production of much smoother particles for the catalyst synthesized with binary template mixture of TEA/morpholine can be depended on the crystallinity increase. Si incorporation value was decreased for the catalyst with a major phase of SAPO-5 (topological structure of AFI). It is indicative that the TEA application would facilitate the formation of AFI structure which is incapable of the incorporating higher amounts of Si in to the crystallite framework. Conclusion: The nature of the template determines the morphology of final product due to different rate of crystal growth obtained in accordance with XRD and FESEM results. Therefore, the catalyst synthesized with TEA/morpholine mixture shows the best performance among synthesized samples in terms of life time in the MTO process sustaining light olefins selectivity at higher values (about 90% after 630 min TOS).

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!