Khu vực nhận download các paper trên Sciencedirect, ACS, IOP và một số paper khác

Em cám ơn anh . Bài 1 anh không down được à anh .

Bài 1 :
Chủ đề " Luminescent colloidal silicon particles "
Tác giả : Anton Fojtik, Arnim Henglein

Abstract
Crystalline silicon particles, which are coated by an oxide layer, are prepared by combustion of silane. Red or orange luminescence is activated by etching them in a 1:1 cyclohexane—propanol-2 suspension by aqueous hydrogen fluoride in the presence of air. The temporal changes in the luminescence intensity of the suspension (several days) are described. When a suspension of luminescent particles in cyclohexane is mixed with polar solvents such as alcohol, ether and chloroform, a more or less quenching of the luminescence (depending on the nature of the added solvent) occurs. Mixing with non-polar solvent such as carbon tetrachloride does not lead to quenching. Triethylamine and ammonia quench the luminescence extremely effectively. Sulfuric acid also quenches. The particles migrate in an electric field in different directions depending on the chemical surface treatment. It is concluded that luminescence occurs when the particles carry only a few oxidized centers on the surface, and the protonation state of these centers strongly affects the luminescence.

Link : http://www.sciencedirect.com/science/article/pii/0009261494002711

Down giùm em bài này với :
Tựa đề :
A study on detecting amine gas using chemical characterization of Ag nanowire

Link :
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5697940

Abstract :
Silver nanowires with diameters ranging from 150 to 200 nm and lengths of 20 ~ 4 or more were prepared by synthesizing in solution-phase. After preparing Ag nanowires, we removed PVP on the surface of Ag nanowires. The methods to remove PVP are followed. We stirred Ag nanowires / 5M HNO3 solutions for 30 minutes. This method makes PVP on an Ag nanowire surface be etched and corroded. Next, we made the nanosized chemical gas sensor using an Ag nanowire between two electrodes on the silicon substrate to use DEP force. Upon exposure to ammonia(NH3) vapor, ensembles of these Ag nanowires showed a resistance increase, that was large, fast and reversible. The reason is that the PVP on the surface of Ag nanowires are removed. These PVP have played role in protecting from by ammonia(NH3) vapor. After removing PVP, the corrosion parts are made on the surface of Ag nanowire. These corrosion parts on an Ag nanowire surface respond with NHj vapor in the air. We guess that this chemical responding is influenced by some reasons, which interrupt electron's transfer through an Ag nanowire backbone. However, more data will be needed in order to unambiguously reveal the structure and chemical composition.

Thanks .

XI trum

http://www.mediafire.com/?m4u2ilw7hnt7m45

Bai 1 ko down duoc, nhung ma em xem trong tai lieu tham khao cua anh Cuong khoa 2006, file dien tu, co dinh kem bai nay` thi` phai... ^_^

Down giùm em mấy bài này với :

Bài 1 :
Tựa : Wafer-Scale Fabrication of Single Polypyrrole Nanoribbon-Based Ammonia Sensor

Abs : Ultra-long (>1 cm) polypyrrole (PPy) nanoribbons were batch-synthesized to predetermined locations on 4 inch Si wafers and flexible polyimide film with controlled thicknesses and widths via modified Lithographically Patterned Nanowire Electrodeposition (LPNE), which combines top-down “photolithography” and bottom-up “electrodeposition”. The excessive lengths and lithographic approach enable subsequent patterning of electrodes for direct device fabrication. Electrical transport properties were investigated by temperature-dependent measurements, and back-gated FET measurements were performed to study the properties with respect to the conductivity of PPy nanoribbons. To demonstrate the utility of this approach these nanoribbon devices were interrogated as gas sensors in a conductometric fashion. They displayed excellent sensitivity toward ammonia vapor with a detection limit in the sub ppm. The sensitivity toward ammonia vapor was tuned by the conductivity of the PPy nanoribbons via chemical de/doping.

Link : http://pubs.acs.org/doi/abs/10.1021/jp102858w

Bài 2 :
Tựa : Synthesis, characterization and self-assembly of silver nanowires
Abs : Silver nanowires with an average length of 6 μm and diameter of about 70 nm have been synthesized by polyol reduction of silver nitrate in the presence of polyvinylpyrrolidone. Scanning electron microscopy, transmission electron microscopy and selected area electron diffraction have been employed to elucidate the structure of the Ag nanowires. The results show that the Ag nanowire capped by PVP are truncated decahedron with fivefold symmetry, bounded by {1 0 0} planes with [1 1 0] growth direction. The monodispersed Ag nanowires can self-assemble into ordered arrays on n-Si(1 0 0) wafer due to the strong interaction of PVP on the surface of them

Link : http://www.sciencedirect.com/science/article/pii/S0009261403014842

Bài 3 :
Tựa : Amine Vapor Sensing with Silver Mesowires
Abs : Silver mesowires with diameters ranging from 150 to 950 nm and lengths of 100 μm or more were prepared by electrochemical step edge decoration. Upon exposure to ammonia (NH3) vapor, ensembles of these mesowires showed a resistance increase, ΔR/Ro, that was large (up to 10,000%), fast (<5 s), and reversible. The vapor of liquid amines, including pyridine and trimethylamine, produced a similar but slower (1 min) response. Hydrogen sulfide caused a large, irreversible resistance increase and carbon monoxide, dioxygen, hydrocarbons, argon, and water, caused no change in resistance for exposures of up to 10 seconds. Exposure to NH3 also induced unexpectedly large resistance increases for mesowires of copper and platinum but metal films showed a maximum ΔR/Ro of < 5%, just as reported previously. Atomic force microscopy analysis of individual silver wires suggests that the increased resistance induced by NH3 exposure was concentrated at a minority (<10%) of the interparticle boundaries present along the axes of these wires.

Link : http://pubs.acs.org/doi/abs/10.1021/nl049841k

Thank you before hand

Xitrum
http://www.mediafire.com/?j325yb6cp5yp092
http://www.mediafire.com/?kweec65j4glmzkw
http://www.mediafire.com/?zpls8bdtbp5q8fk

Kiếm giùm em bài này với , em thấy nó trong mục reference nhưng ko biết làm sao lấy link bài đó ra

Janata, J.; Josowicz, M. Nat. Mater. 2003, 2, 19.

Thank before hand .

Giúp mình down mấy tài liệu này nhé bạn. thank you first!!!

1.Collingham, Elizabeth (2006). Curry. Oxford University Press

2.Johnson, Wilbur (2007). “Final report on the safety assessment of capsicum annuum extract, capsicum annuum fruit extract, capsicum annuum resin, capsicum annuum fruit powder, capsicum frutescens fruit, capsicum frutescens fruit extract, capsicum frutescens resin, and capsaicin”.

3.Gajda J, Switka A, Kuźma K, Jarecka J (2006). “[Sudan and other illegal dyes--food adulteration]” (bằng Polish). Roczniki Państwowego Zakładu Higieny 57

tên bài: Ceramics International
Volume 37, Issue 8, December 2011, Pages 3063-3070
tác giả: Rafael Salomãoa, , , L.M. Milenaa, M.H. Wakamatsua, Victor C. Pandolfellib,
Tạp chí: sciendirect


Hydrotalcitesynthesis via co-precipitation reactions using MgO and Al(OH)3 precursors
Rafael Salomãoa, , , L.M. Milenaa, M.H. Wakamatsua, Victor C. Pandolfellib,


Purchase
a Federal University of the ABC Region, Rua Santa Adélia, 166 ZIP 09210-170, Santo André, SP, Brazil
b Federal University of São Carlos – Materials Engineering Department, Rodovia Washington Luís, km 235, São Carlos, SP, Brazil
Received 22 March 2011; revised 5 May 2011; Accepted 9 May 2011. Available online 13 May 2011.

Abstract
Hydrotalcite (Mg6Al2(OH)16(CO3)·4H2O), also known as aluminum–magnesium layered double hydroxide (LDH) or anionic clay, is a synthetic compound that was broadly investigated in the past decade due to its many potential applications, such as clinic anti-acid, catalyst support, adsorptive flotation, flame retardant, acid scavengers in polymer composites and as a raw material for high temperature insulating porous ceramics. This compound is usually produced by controlled chemical equilibrium shifting processes (such as co-precipitation) that requires various other purification steps (centrifugation, for example) and careful drying (freeze drying or ultrafiltration). In this paper, a novel route to synthesize hydrotalcite is presented, based on the hydration, dissolution and co-precipitation reactions carried out almost simultaneously in aqueous suspension containing reactive magnesium oxide and aluminum hydroxide. Compared to other methods (the regular co-precipitation, particularly), it presents various technological advantages such as low time-energy consumption, no further purification step requirement, high output and competitive production costs.

Keywords: Hydrotalcite; Magnesium oxide; Aluminum hydroxide; Hydration

Article Outline
1. Introduction
2. Materials and techniques
3. Results and discussion
3.1. Aqueous mixing of different sources of Mg2+ and Al3+ ions
3.2. The MgO–Al(OH)3 system
4. Remarks
Acknowledgements
References

bai của bạn ngocphale_22 đây:

http://www.mediafire.com/?72k52dqggap3pqv

thanks ban nguytroa nhieu nhe

nguytroa oi giup minh down may bai nay nua nhe!


Tên: Cement and Concrete Research
Volume 40, Issue 8, August 2010, Pages 1248-1254
doi:10.1016/j.cemconres.2009.08.031 | How to Cite or Link Using DOI
Cited By in Scopus (7)
Permissions & Reprints
Tác giả: K. Rozova, c, , , U. Bernera, C. Taviot-Guehob, F. Lerouxb, G. Renaudinb, D. Kulika, L.W. Diamondc

Synthesis and characterization of the LDH hydrotalcite–pyroaurite solid-solution series



Purchase

a Waste Management Laboratory, Paul Scherrer Institute, 5210 Villigen, Switzerland
b Laboratoire de Matériaux Inorganiques, CNRS UMR 6002, Université Blaise Pascal, F-63177 Aubière Cedex, France
c Rock-Water Interaction Group, Institute of Geological Sciences, University of Bern, Baltzerstrasse 3, CH-3012, Switzerland
Received 5 June 2009; Accepted 25 August 2009. Available online 16 October 2009.

Abstract
A layered double hydroxide (LDH) hydrotalcite–pyroaurite solid-solution series Mg3(AlxFe1 − x)(CO3)0.5(OH)8 with 1 − x = 0.0, 0.1……1.0 was prepared by co-precipitation at 23 ± 2 °C and pH = 11.40 ± 0.03. The compositions of the solids and the reaction solutions were determined using ICP-OES (Mg, Al, Fe, and Na) and TGA techniques (CO32−, OH−, and H2O). Powder X-ray diffraction was employed for phase identification and determination of the unit cell parameters ao and co from peak profile analysis. The parameter ao = bo was found to be a linear function of the composition. This dependency confirms Vegard's law and indicates the presence of a continuous solid-solution series in the hydrotalcite–pyroaurite system. TGA data show that the temperatures at which interlayer H2O molecules and CO32− anions are lost, and at which dehydroxylation of the layers occurs, all decrease with increasing mole fraction of iron within the hydroxide layers.

Features of the Raman spectra also depend on the iron content. The absence of Raman bands for Fe-rich members (xFe > 0.5) is attributed to possible fluorescence phenomena.

Based on chemical analysis of both the solids and the reaction solutions after synthesis, preliminary Gibbs free energies of formation have been estimated. Values of ΔG°f(hydrotalcite) = − 3773.3 ± 51.4 kJ/mol and ΔG°f(pyroaurite) = − 3294.5 ± 95.8 kJ/mol were found at 296.15 K. The formal uncertainties of these formations constants are very high. Derivation of more precise values would require carefully designed solubility experiments and improved analytical techniques.

Keywords: Hydrotalcite; (B) Characterization; Thermodynamic Calculations; (E) Waste Management; Modeling

Article Outline
1. Introduction
2. Materials and methods
2.1. LDH synthesis
2.2. Analyses and characterization
2.2.1. ICP-OES analyses
2.2.2. Ion chromatography
2.2.3. Total inorganic carbon analysis (TIC)
2.2.4. Powder X-ray diffraction (PXRD)
2.2.5. Thermogravimetric analyses (TGA)
2.2.6. Raman spectroscopy
2.2.7. Determination of solid compositions
2.2.8. Estimation of Gibbs free energies
3. Results
4. Conclusions and discussion
Acknowledgements
References

Corresponding author. Waste Management Laboratory, Paul Scherrer Institute, 5210 Villigen, Switzerland.

Tên bài: Journal of Molecular Catalysis A: Chemical
Volume 352, January 2012, Pages 31-37
doi:10.1016/j.molcata.2011.09.009 | How to Cite or Link Using DOI
Permissions & Reprints
Tác giả: Jaggi Lala, , , Monika Sharmaa, Savita Guptab, Priyanka Parashara, Pramod Sahua, D.D. Agarwala


Hydrotalcite: A novel and reusable solid catalyst for one-pot synthesis of 3,4-dihydropyrimidinones and mechanistic study under solvent free conditions



Purchase
a Department of Industrial Chemistry, Jiwaji University, Gwalior 474 011 India
b Cadila Pharmaceuticals, Ltd., Ahmedabad 382 210 India
Received 25 April 2011; revised 25 August 2011; Accepted 14 September 2011. Available online 21 September 2011.

Abstract
Synthesis of 3,4-dihydropyrimidinones/thiones, a multicomponent synthesis using ethyl acetoacetate, substituted aromatic aldehydes, and urea/thiourea has been carried out in presence of Mg–Al–CO3 and Ca–Al–CO3hydrotalcite as a reusable solid catalyst. The work has been carried out under thermal solvent-free conditions without microwave irradiations, and under microwave irradiation. In this method excellent yield of 3,4-dihydropyrimidinones/thiones is reported in shorter duration. Hydrotalcites are non-toxic, easy to separate and recyclable catalyst hence making this process environment friendly. Mechanistic study of the reaction using hydrotalcites as catalyst has been studied under thermal conditions without microwave irradiations.

Graphical abstract
. Synthesis of 3,4-dihydropyrimidinones/thiones by cyclocondensation of ethyl acetoacetate, substituted aromatic aldehydes, and urea/thiourea using Mg–Al–CO3 and Ca–Al–CO3 hydrotalcites as a reusable catalyst has been reported under solvent-free conditions and microwave irradiations.


High-quality image (110K)
Highlights
► This catalytic reaction takes place under solvent free conditions thus eliminating organic solvent, it gains an environment friendly condition. ► Yield of the desired product is excellent in the present synthesis. ► Hydrotalcite is a reusable heterogeneous catalyst there is no significant loss of catalytic activity when tested up to five catalytic cycles. ► Hydrotalcite catalyst containing Mg, Al and Ca are environment friendly metals.

Keywords: Dihydropyrimidinones; Multicomponent synthesis; Mg–Al–CO3 and Ca–Al–CO3hydrotalcite catalyst; Solvent free; Microwave irradiations; Mechanistic study

Article Outline
1. Introduction
2. Experimental
2.1. Catalyst preparation
2.2. Synthesis of 5-(ethoxycarbonyl)-6-methyl-4-phenyl-3,4-dihydropyrimidin-2(1H)-one under solvent free conditions
2.3. Synthesis of 5-(ethoxycarbonyl)-6-methyl-4-phenyl-3,4-dihydropyrimidin-2(1H)-one under microwave irradiations
3. Results
3.1. Catalytic activity
3.2. Analytical data of synthesized product
3.3. Basicity of the hydrotalcites
3.4. Mechanistic study
3.5. Recyclability of catalyst
4. Discussion
5. Conclusions
Acknowledgements
References

Corresponding author. Tel.: ++91 9039035228.

Tên bài: Solid State Sciences
Volume 11, Issue 2, February 2009, Pages 376-381
doi:10.1016/j.solidstatesciences.2008.08.003 | How to Cite or Link Using DOI
Cited By in Scopus (
Permissions & Reprints
Tác giả: Xiang Yua, b, Jun Wanga, b, Milin Zhanga, b, , , Piaoping Yangb, Lihui Yanga, b, Dianxue Caob, Junqing Lia, b


One-step synthesis of lamellar molybdate pillared hydrotalcite and its application for AZ31 Mg alloy protection



Purchase
a Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, 150001, PR China
b College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, PR China
Received 10 March 2008; revised 24 July 2008; Accepted 12 August 2008. Available online 19 August 2008.

Abstract
A novel anticorrosion pigment for AZ31 Mg alloy protection, molybdate pillared hydrotalcite (HT-MoO42−), was successfully fabricated via a simple one-step process. The physicochemical properties of the samples were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Raman spectra, and inductively coupled plasma (ICP) method, respectively. The results indicated that the material showed typical characteristics of molybdate intercalated hydrotalcite. Additionally, it was found that the sample exhibited nano-sized lamellar morphology with the particle size of 35–60 nm. Moreover, the coating on AZ31 Mg alloy containing HT-MoO42− pigment showed obviously higher corrosion protection performance in comparison with the strontium chromate (SC) pigment by Electrochemical impedance spectroscopy (EIS) measurements. The mechanism of corrosion protection was proposed to be that the HT-MoO42− pigment in the coating would cause the pigment to undergo amphoteric ion exchange with aggressive NaCl solution, leading to the release of molybdate and Zn2+ inhibitors.

Graphical abstract

Keywords: Corrosion protection; Hydrotalcite; Molybdate; Mg alloy

Article Outline
1. Introduction
2. Experimental section
2.1. Hydrotalcite synthesis
2.2. Ionic exchange
2.3. Coating preparation and application
2.4. Characterization
3. Results and discussion
4. Conclusions
Acknowledgments
References

Corresponding author. Tel.: +86 451 8251 9696; fax: +86 451 8253 3026.

Applied Catalysis A: General
Volume 386, Issues 1–2, 30 September 2010, Pages 34-42
doi:10.1016/j.apcata.2010.07.021 | How to Cite or Link Using DOI
Cited By in Scopus (0)
Permissions & Reprints

Reconstructed Mg/Al hydrotalcite as a solid base catalyst for synthesis of jasminaldehyde
Sumeet K. Sharmaa, 1, , , Parimal A. Parikhb, Raksh V. Jasraa, ,


Purchase
a Discipline of Inorganic Materials & Catalysis, Central Salt and Marine Chemicals Research Institute (CSIR), G.B. Marg, Bhavnagar – 364 021, Gujarat, India
b Department of Chemical Engineering, SV National Institute of Technology, Surat 395 007 Gujarat, India
Received 8 March 2010; revised 9 July 2010; Accepted 12 July 2010. Available online 20 July 2010.

Abstract
Reconstructed hydrotalcites (Mg/Al molar ratio = 3.5) of varied reconstruction time were synthesized and used as catalysts for solvent free condensation of 1-heptanal with benzaldehyde. Maximum conversion of 1-heptanal with higher selectivity to jasminaldehyde was obtained using reconstructed hydrotalcites of 8–12 h reconstruction time. Catalytic activity of reconstruction hydrotalcite was compared with as-synthesized and activated hydrotalcite of Mg/Al molar ratio 3.5 and significantly higher conversion of 1-heptanal was observed in case of reconstructed hydrotalcite of 8 h reconstruction time as a catalyst. Similar to the conversion, higher selectivity to jasminaldehyde was also obtained using reconstructed hydrotalcite. Effect of reconstruction time on conversion and selectivity to jasminaldehyde was studied by varying the reconstruction time of hydrotalcite from 0.5 to 72 h. Kinetic experiments were carried out to study the effect of stirring speed, benzaldehyde to 1-heptanal molar ratio, amount of catalyst and reaction temperature on the rate of reaction using reconstructed hydrotalcite as a catalyst.

Graphical abstract
.


High-quality image (94K)
Research highlights
▶ Maximum conversion of 1-heptanal with higher selectivity to jasminaldehyde was obtained using reconstructed hydrotalcites of 8–12 h reconstruction time. ▶ Reconstructed hydrotalcite of 8 h reconstruction time showed 96% conversion of 1-heptanal within 120 min, however, 51 and 60% conversion were observed using as-synthesized and calcined hydrotalcite, respectively. ▶ Effect of stirring speed, benzaldehyde to 1-heptanal molar ratio, amount of catalyst and reaction temperature on rate of reaction was studied in detail.

Keywords: 1-Heptanal; Jasminaldehyde; Condensation; Reconstructed hydrotalcite; Kinetics

Article Outline
1. Introduction
2. Experimental
2.1. Materials
2.2. Catalyst synthesis
2.3. Characterization of the catalyst
2.4. Synthesis of jasminaldehyde
2.5. Kinetic analysis and reproducibility
3. Results and discussions
3.1. Characterization of catalyst
3.2. Catalytic activity for the synthesis of jasminaldehyde
3.2.1. Effect of stirring speed
3.2.2. Effect of catalyst amount
3.2.3. Effect of benzaldehyde to 1-heptanal molar ratio
3.2.4. Effect of reaction temperature
4. Conclusions
Acknowledgement
References

Corresponding author. Present address: R&D Centre, VMD, Reliance Industries Limited, Vadodara 391 346, Gujarat, India. Tel.: +91 265 6696313; fax: +91 265 6693934.

1Present address: Department of Chemical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK.

Catalysis Today
Volume 141, Issues 1–2, 15 March 2009, Pages 94-98
Selected Papers from the "Catalysis for future fuels" 18th National Symposium and INDO-US Seminar on Catalysis, Indian Institute of Petroleum, Dehradun, India, April 16-18, 2007
doi:10.1016/j.cattod.2008.05.010 | How to Cite or Link Using DOI
Cited By in Scopus (4)
Permissions & Reprints

Role of promoters on highly active nano-Ru catalyst supported on Mg–Al hydrotalciteprecursor for the synthesis of ammonia
P. Seetharamulua, K. Hari Prasad Reddya, A.H. Padmasrib, K.S. Rama Raoa, , , B. David Rajua, ,


Purchase
a Inorganic & Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India
b Department of Chemistry, University College for Women, Osmania University, Koti, Hyderabad 500 001, India
Available online 25 June 2008.

Abstract
Single (Ba) and double promoted (Ba and Cs) Ru catalysts supported on calcined Mg–Al hydrotalcite were prepared by polyol reduction method to investigate the role of promoters on catalytic activity for NH3synthesis at atmospheric pressure. The activities of these catalysts were compared with those of their corresponding impregnated catalysts. All the catalysts were characterized by X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed desorption (TPD) of CO2 to determine basicities of the catalyst, BET surface area and CO chemisorption studies to find out particle size and active metal area of Ru. The reaction rate on the double promoted Ru catalysts was found to be higher than single promoted one. The double promoted catalyst prepared by polyol method exhibited exceptionally high activity (0.76%, v/v) at 598 K among all the other catalysts studied. The higher activity was attributed to the availability of more number of basic sites due to the presence of both Cs and Ba promoters as observed from CO2 TPD and to the easily reducible Ru species, which was confirmed by TPR analysis.

Keywords: Ammonia; Promoter; Hydrotalcite; Ruthenium; Polyol method

Article Outline
1. Introduction
2. Experimental
2.1. Preparation of catalysts
2.2. Characterization techniques
2.3. Activity studies
3. Results and discussion
4. Conclusions
References

Corresponding authors. Tel.: +91 40 27193510; fax: +91 40 27160921.

http://www.mediafire.com/?a2m996df99qooxq

link 4 bài của bạn nè.. lần sau bạn post uey6 cầu ngắn gọn xíu nha.. hi hi.. bạn post như vậy mình rất dễ bị rối..có thể sẽ down sót.. hi hi

uh thanks b nhieu nhe

TÊN BÀI: Applied Clay Science
Volume 53, Issue 4, October 2011, Pages 627-633
doi:10.1016/j.clay.2011.05.013 | How to Cite or Link Using DOI
Cited By in Scopus (1)
Permissions & Reprints

Research Paper

Catalytic wet peroxide oxidation of phenol over Cu–Ni–Al hydrotalcite
Shiwei Zhoua, Zhenying Qiana, Tao Sunb, Jinguang Xub, Chuanhai Xiaa, ,


Purchase
a Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
b Chemistry & Biology College, Yantai University, Yantai 264005, China
Received 7 September 2010; revised 13 May 2011; Accepted 16 May 2011. Available online 12 June 2011.

Abstract
Liquid phase catalytic oxidation of phenol was carried out over Cu–Ni–Al hydrotalcite at ambient temperature and pressure using hydrogen peroxide as oxidant. The results showed that the hydrotalcite catalyst had high catalytic activity, where phenol could be completely oxidized by H2O2 into oxalic acid, formic acid and CO2 within 2 h at 30 °C. The catalytic oxidation process was zero-order kinetics with an activation energy of 61.5 kJ mol− 1. A feasible reaction system could be proposed as follows: 0.8 g L− 1 of catalyst, n (H2O2)/n (phenol) = 15, temperature of 40 °C, 2.66 mM of phenol and time of 2 h. Furthermore, it was found that the presence of inorganic chlorides promoted markedly the oxidation rate of phenol, probably due to the formation of intermediate products containing chlorine such as quinones and/or radicals.

Applied Clay Science
Volume 53, Issue 3, September 2011, Pages 374-378
Environment and Archaeology at the 14th International Clay Conference
doi:10.1016/j.clay.2010.06.028 | How to Cite or Link Using DOI
Cited By in Scopus (3)
Permissions & Reprints

Research Paper

Intercalation and release of antiinflammatory drug diclofenac into nanosized ZnAl hydrotalcite-like compound
L. Periolia, T. Posatib, M. Nocchettib, , , F. Bellezzab, U. Costantinob, A. Cipicianib, ,


Purchase
a Dipartimento di Chimica e Tecnologia del Farmaco, Università degli Studi di Perugia, Via del Liceo 1, 06123 Perugia, Italy
b CEMIN - Centro di Eccellenza Materiali Innovativi Nanostrutturati, Dipartimento di Chimica, Università degli Studi di Perugia, via Elce di Sotto 10, 06123 Perugia, Italy
Received 12 November 2009; revised 24 June 2010; Accepted 30 June 2010. Available online 10 July 2010.

Abstract
A nanostructured hydrotalcite-like compound of formula [Zn0.72Al0.28(OH)2] Br0.28·0.69 H2O has been used as inorganic layered host of the anionic form of diclofenac (DIK), a Non Steroidal Antiinflammatory Drug. The obtained intercalation compound has been characterized by chemical analysis, X-ray powder diffraction pattern, thermogravimetrical analysis and SEM and TEM microscopy. The nanohybrid ZnAl-DIK, with empirical formula [Zn0.72Al0.28(OH)2]DIK0.281.35 H2O and interlayer spacing 22.5 Å, was made up of submicrometric hexagonal platelets. The drug loading was 41.8% w/w. The material was submitted to in vitro drug release studies using three different simulated intestinal media. The release profiles were fitted by mathematical models describing various kinetics in order to investigate the drug release mechanism. The results were compared to literature data obtained with micro-sized MgAl-DIK.

Applied Clay Science
In Press, Corrected Proof - Note to users
doi:10.1016/j.clay.2011.11.026 | How to Cite or Link Using DOI
Permissions & Reprints

Characterization of Zn–Ni–Fe hydrotalcite-derived oxides and their application in the hydrolysis of carbonyl sulfide
Shunzheng Zhaoa, Honghong Yi, a, , Xiaolong Tanga, Dongjuan Kanga, Hongyan Wanga, Kai Lia, Kaijiao Duana


Purchase
a Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
Received 15 July 2011; revised 16 November 2011; Accepted 24 November 2011. Available online 20 December 2011.

Abstract
A series of Zn, Ni and Fe containing hydrotalcite-like compounds with various M2+/M3+ ratios were synthesized by co-precipitation method at pH = 10. The products were characterized by XRD, SEM, TG-DTA, FTIR, CO2-TPD and N2 adsorption/desorption techniques. The results showed that M2+/M3+ ratio affected the formation of hydrotalcite crystal seriously. The precursors with M2+/M3+ mole ratio of 2 and 3 showed pure hydrotalcite phase. After calcination at 250 °C, the derived oxides with larger surface area and more basic sites were obtained. Desulfurization tests showed that the Zn–Ni–Fe hydrotalcite-derived oxide exhibited an excellent activity in low temperature hydrolysis of COS. The optimum M2+/M3+ mole ratio was 3.

Chemical Engineering Journal
Volume 171, Issue 3, 15 July 2011, Pages 1387-1398
Special Section: Symposium on Post-Combustion Carbon Dioxide Capture
doi:10.1016/j.cej.2011.05.053 | How to Cite or Link Using DOI
Cited By in Scopus (0)
Permissions & Reprints

Kinetic modeling of ethylbenzene dehydrogenation over hydrotalcite catalysts
Luqman Atanda, Nabil Al-Yassir, Sulaiman Al-Khattaf ,


Purchase
KAUST Center in Development, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
Received 30 January 2011; revised 13 April 2011; Accepted 12 May 2011. Available online 19 May 2011.

Abstract
Kinetics of ethylbenzene dehydrogenation to styrene was investigated over a series of quaternary mixed oxides of Mg3Fe0.25Me0.25Al0.5 (Me = Co, Mn and Ni) catalysts prepared by calcination of hydrotalcite-like compounds and compared with commercial catalyst. The study was carried out in the absence of steam using a riser simulator at 400, 450, 500 and 550 °C for reaction times of 5, 10, 15 and 20 s. Mg3Fe0.25Mn0.25Al0.5 afforded the highest ethylbenzene conversion of 19.7% at 550 °C. Kinetic parameters for the dehydrogenation process were determined using the catalyst deactivation function based on reactant conversion model. The apparent activation energies for styrene production were found to decrease as follows: E1-Ni > E1-Co > E1-Mn.

Applied Clay Science
Volume 55, January 2012, Pages 158-163
doi:10.1016/j.clay.2011.11.010 | How to Cite or Link Using DOI
Permissions & Reprints

Characterisation of Diclofenac, Ketoprofen or Chloramphenicol Succinate encapsulated in layered double hydroxides with the hydrotalcite-type structure
M.S. San Romána, M.J. Holgadoa, B. Salinasa, V. Rives, a,


Purchase
a GIR-QUESCAT—Departamento de Química Inorgánica, Universidad de Salamanca, 37008 Salamanca, Spain
Received 14 June 2011; revised 9 November 2011; Accepted 11 November 2011. Available online 16 December 2011.

Abstract
Three series of hybrid organic–inorganic layered double hydroxide samples containing Zn2 + and/or Mg2 + and Al3 + in the brucite-like layers (nominal M2 +/Al molar ratio 2:1) and Diclofenac, Ketoprofen or Chloramphenicol Succinate as counter-anions, were synthesized by coprecipitation using drug/Al molar ratios of 2:1 to prepare the starting solutions. All samples have been characterised by element chemical analysis, powder X-ray diffraction, FT-IR spectroscopy, thermal analysis and morphology analysis (Scanning Electron Microscopy). The nanohybrids here prepared show a rather high crystallinity degree and the drug molecules are strongly interacting with the brucite-like layers.

http://www.mediafire.com/?lf5yms77c8shq1u

5 bài bào của bạn đây... lần sau post bài.. bạn cho mình xin them cái link..để đở phải tìm kiếm nha...

uh. thanks b nhieu lam