Sun Ha Lee1, Yangkyu Ahn1*, In Jung2, Keunwoo Lee2

Slides:

Advertisements

Similar presentations

SYNTHESIS AND PROPERTIES OF SUPRAMOLECULAR COMPOUNDS ON THE BASE OF LAYERED DOUBLE HYDROXIDES Isupov V.P., Tarasov K.A., Chupakhina L.E., Mitrofanova R.P.,

Advertisements

Dept. of Chemistry, SCSVMV University

Preparation & Characterization of heterogeneous catalyst

Hybrid Materials & POSS

Development (fabrication& characterization) of new Cu nanostructured & nanoceramic-Cu composites. Heider Yasser Thamir; PhD student Supervised by: Dr.

Chapter 9 Synthesis Methods Hong-Wen Wang. How to prepare ceramic powders ? Sol-Gel Process Aqueous solution (from metal salts or colloidal particles)

J Fusion Energ (2011) 30:433–436 DOI /s OR IGINAL RESEARCH Filament Temperature Dependence of the Nano-size MgO Particles Prepared.

Energetic Material (TKK-2130) 13/14 Spring Semester Instructor: Rama Oktavian Office Hr.: M.13-15, Tu , W ,

Chemical Nanoparticle Deposition of Oxide Nanostructured Thin Films 6. Conclusions 2. Experimental Setup 1. Abstract We have developed a novel approach.

Department of Chemical Engineering University of South Carolina by Hansung Kim and Branko N. Popov Department of Chemical Engineering Center for Electrochemical.

Rajalekshmi Chockalingam, Vasantha R.W. Amarakoon, and Herbert Giesche New York State College of Ceramics at Alfred University, Alfred, NY, USA Alumina.

Synthesis, Characterization And Immobilized Polysiloxane Application Of Diethyenetriaminetetraacetic acid Prepared by : Abd-Erahman El-Agah Chemistry Department.

SONOCHEMICAL SYNTHESIS OF NANO MANGANESE DIOXIDE PARTICLES FOR BATTERY APPLICATIONS K. Saminathan, S. R. Srither, K. KathiKeyan, S. Praveen and V. Rajendran.

Unusual Fluorescence of Eu(III)Porphyrin Entrapped In Sol-gel Silica Matrix Unusual Fluorescence of Eu(III)Porphyrin Entrapped In Sol-gel Silica Matrix.

MACROPOROUS SCAFFOLDS FOR BONE REPLACEMENT. SCAFFOLD is, as in house building, a structure meant to support the growing edifice: bone regeneration Simulates.

1 Unit 3 Nanomaterials. 2 Introduction Definition – nm in at least one dimensionDefinition – nm in at least one dimension HistoryHistory –Clay.

Nano-particle prepared from sol-gel method 1. TiO2 Polyethylene glycol Titanium tetra-iso-propoxidediethanolamine Solution I with Polyethylene glycol Solution.

Photoluminescence of Mesoporous Silica Film Impregnated with an Erbium Complex Oun-Ho Park †, Jae Young Bae, Ji-in Jung, and Byeong-Soo Bae Laboratory.

ATOMIC LITHOGRAPHY & SOL GEL PROCESSING Dhruvi Mehta SAP ID: Batch: A2.

2. Experimental 4. Conclusions Nano crystalline zinc oxide can be prepared by a simple and cost-effective sol–gel process using aromatic acid ( salicylic.

Synthesis of Barium Titanate Nanoclusters Presented by Marc Landeweer Advisor: Prof. Slamovich.

指導教授：林克默學生：陳立偉 Introduction Recently,the interest in up-conversion emission has been increased due to the needs for all-solid compact.

Highly Ordered Deposition of MgAl-CO3 Layered Double Hydroxides on Si(100) Surface by Solvothermal Treatment 이종현 , 이석우 , 송여진 , 정덕영* 성균관대학교 Skku. Inorganic.

1 Photocatalytic behavior of TiO2 thin films prepared by sol–gel process Ki Hyun Yoon a,b,c, ∗, Jung Sok Noha, Chul Han Kwon a,b, Mamoun Muhammedc a Department.

Introduction P. Chelvanathan 1, Y. Yusoff 2, M. I. Hossain 1, M. Akhtaruzzaman 1, M. M. Alam 3, Z. A. AlOthman 3, K. Sopian 1, N. Amin 1,2,3 1 Solar Energy.

Preparation of the Bi 12 SiO 20 thin films by the sol-gel method Š. Kunej, A. Veber and D. Suvorov Advanced Materials Jožef Stefan Institute.

日期：指導老師：林克默學生：陳冠廷. Outline 1.Introduction 2.Experimental 3. Results and discussion 4. Conclusions.

Sol-gel Synthesis & Characterization of Luminescent Quantum Dots Laura Ingalls Huntley Prof. Christie LaRochelle PHY490: Senior Independent Study 04 May.

Synthesis, Characterization, and Magnetic Properties of Uniform-sized MnO Nanospheres and Nanorods Jongnam Park,† Eunae Kang,† Che Jin Bae,‡ Je-Geun Park,‡

Bottom up and Top down approaches Ball Milling and Sol-Gel technique

Synthesis and characterization of poorly-crystaline Fe-Al nano- hydroxides Crop and Soil Sciences Department & Center of Environmental Kinetics Analysis.

Reporter : Wan-Ting Chiou Adviser : Ming-Shyong Tsai Date : 2011/10/26

Department of Chemistry , SungKyunKwan University

Sol-Gel.  - Why Sol-Gel..? ApplicationsConventional methods Glass preparation and ceramics High temparature, thermal decomposition, limited materials.

Solution State Synthesis

Ceramic substrate, EDX, Si MappingNonwoven Ceramic substrate S UMMARY Experimental Bead milling and Stirring Coating Drying and Gelation Ceramic porous.

LOGO Water Gas Shift Reaction Over Au/Ce x Ti y O 2 Cheng Wan.

Iron doped Zinc Oxide (Fe 0.2 Zn 0.8 O) by sol-gel method and its Characterization. K. Peddanna By M.Sc. Nano Science Dept. of Physics OSMANIA UNIVERSITY.

Synthesis and Characterization of Magnetic ` Chitosan Microspheres for Medical Applications ` Sang Gil Ko 1 *, Jun Hee Cho 1, Yang kyu Ahn 1, Ki Chang.

SOL-GEL METHOD The sol-gel process may be described as: ”Formation of an oxide network through hydrolisis and polycondensation reactions of a molecular.

COLLOIDAL SILICA. AGENDA Colloidal silica chemistry -Physical characteristics -Types Colloidal silica manufacturing -Evaporator -Grow/UF -UltraXol Colloidal.

CATALYST AND THIN FILM FABRICATIONS FROM SOL-GEL.

Jun Hee Cho1, Sang Gil Ko1, Yang kyu Ahn1, Eun Jung Choi2

Magnetite nanoparticles encapsulated

Particle Size Dependence of Magnetic Properties in Cobalt Ferrite Nanoparticles Jun Hee Cho 1, Sang Gil Ko 1, Yang kyu Ahn 1, Eun Jung Choi 2 * 1 Department.

With Polymerized Sol A New, Ceramic Composite Nonwoven-Reinforced SPAES Proton Conductor for PEMFC Applications A New, Ceramic Composite Nonwoven-Reinforced.

Jun Hee Cho 1*, Sang Gil Ko 1, Yangkyu Ahn 1, Ki-Chang Song 2, Eun Jung Choi 3 1 Department of Nanochemistry & Biochemistry, Konyang University Nonsan,

by chemical solution process

Preparation and Characterization of Beta-glucan/silica Nanocomposites

Hydrothermal Growth of Two-Dimensional SrMnO3 Matthew A

Production of NTCR Thermistor Devices based on NiMn2O4+d

Submitted by SK Ruksana M.Sc. Chemistry

Fabrication of Hybrid Solar Cells using ZnS Nanoparticles

International Conference on Electron Microscopy

Blend membrane by using the PVA/chitosan and crosslinking with TEOS for pervaporation separation for water acetic acid mixtures Shivshankar Chaudhari1,

Fig. 2. SEM images of: a) sample A, b) sample B.

THE PREPARATION OF BiFeO3 TACTILE SENSOR

Result and Discussion Abstract Introduction Experimental

Results and Discussion Results and Discussion

Preparation of magnetic β - glucan microspheres by microemulsion method for targeting drug delivery system Jun Hee Cho 1*, Sang Gil Ko1, Yangkyu Ahn1,

Rama Gaur and P. Jeevanandam*

Prof. Sergiy Lavrynenko National Technical University “Kh. P. I

Synthesis and Characterization of ZnO-CdS Core-Shell Nanohybrids by Thermal Decomposition Method and Studies on Their Charge Transfer Characteristics Rama.

Preparation of Ultrafine PETN using Sol-Gel Method

Centro de Investigación y de Estudios Avanzados del Institúto Politécnico Nacional (Cinvestav IPN) Palladium Nanoparticles Formation in Si Substrates from.

Fig.1. XRD pattern of powder synthesized at 25oC.

اصول سنتز نانوذرات با روش ترسیب شیمیایی (1)

Pharmaceutical Technology

MileStone 2K19, SSBT Coet’s, Department of Chemical Engineering.

Gravimetric Analysis.

Presentation transcript:

Preparation of Spherical Silica-coated Ceria Nanoparticles by Sol-Gel Method Sun Ha Lee1, Yangkyu Ahn1*, In Jung2, Keunwoo Lee2 1Department of Nanochemistry & Biochemistry, Konyang University, Korea 2 Inochem, BI Center, Konyang University, Korea *ykahn@konyang.ac.kr Tel.+82-41-730-5224

Abstract DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY Monodispersed spherical silica-coated ceria nanoparticles were prepared through a sol-gel process using tetraethylorthosilicate (TEOS) and ceria fine particles. In this process, ceria fine particles were also prepared from cerium nitrate. The mean size of ceria particles was 300nm. Silica nanoparticles with narrow particle size distribution were prepared by controlled hydrolysis of TEOS solution. The silica sols were obtained by peptization, the process of redispersing a coagulated colloid, and were coated on ceria particles by the control of the weight ratio of silica/ceria and the pH of the mixture in aqueous solution. The morphologies of particles were characterized with scaning electron microscopy(SEM), transmission electron microscopy(TEM) and atomic force microscopy(AFM). The coating thickness of silica particles obtained by using this method was controlled in the range of 30 - 70nm. DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

Sol-Gel Method Sol-gel process : With thermal decomposition of the gelation due to the hydrolysis and condensation reaction of the alcoxide or organic compounds and the vaporization due to same thermal reaction the oxide thin film production. DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

Sol-Gel Application Powders, Grains and Spheres Fibers Thin films and coatings -Optical coating -Electronic films -Protective films -Porous films Monoliths -Fiber optic preform -Lenses -Graded refractive index glass -Transparent foam application Composites Porous gels and membranes DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

Sol-Gel Process for Colloidal Silica Growing TEOS EtOH NH4OH H2O Generation of seed Fabrication process of silica sol Application(Coating or Powder) Mixing Hydrolysis Reaction DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

Synthesis Process of Nanosized Ceria Powder Ce(CO3)9H2O+HCl, HNO3 (Dissolution) Filtering Cerium Hydroxide Washing Firing Milling Work for Sol Drying CeO2-Sol CeO2 Powder DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

NH OH 4 SiO 2 TEOS TEOS EtOH EtOH EtOH Synthesis of Nanosized Silica Stop reaction 4 SiO 2 TEOS TEOS EtOH EtOH S H S H EtOH optimum conditions:  add TEOS, mmol  stirring time : 30 min  stirring temperature : room temperature optimum conditions:  add NH4OH, mmol  stirring time : 2hr  stirring temperature : 45℃ Washing by centrifuge SiO2 Drying at 80℃ DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

TEOS EtOH NH 4 OH CeO 2 EtOH TEOS Preparation of Silica Coated Ceria Particles optimum conditions:  1hr stirring at 45℃  1hr stirring at room temperature SiO2 H S TEOS EtOH NH 4 OH CeO 2 30nm CeO2 EtOH H S TEOS 300nm Drying for 24hr at 80℃ DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

Size Control by Base/TEOS Ratio (1) EtOH/TEOS molar rate NH3/TEOS molar rate Particles size (nm) (1) 35.14 0.14 25 (2) 30.04 64 (3) 26.62 97 (4) 24.08 115 (2) (3) (4) at 45℃ NH3/TEOS molar rate EtOH/TEOS molar rate Particles size (nm) (1) 0.11 30.04 32 (2) 0.13 57 (3) 0.14 82 (4) 0.17 117 (4) (3) (2) (1) at 45℃ DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

Size Control by Ethanol/TEOS Ratio (1) EtOH/TEOS molar rate NH3/TEOS molar rate Particles size (nm) (1) 35.14 0.14 25 (2) 30.04 64 (3) 26.62 97 (4) 24.08 115 (2) (3) (4) at 45℃ NH3/TEOS molar rate EtOH/TEOS molar rate Particles size (nm) (1) 0.11 30.04 32 (2) 0.13 57 (3) 0.14 82 (4) 0.17 117 (4) (3) (2) (1) at 45℃ DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

Characterization of Silica Sol AFM image (2) (1) Mean(nm) 45.6 45.1 42.2 temperature (℃) Particles size (nm) (1) 45 74 (2) 25 110 DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

SEM Images of Colloidal Silica DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

X-ray diffraction pattern XRD Analysis Results X-ray diffraction pattern Silica - amorphous Silica coated ceria Ceria - crystal DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

Microscopic Images of the Samples Silica coated ceria powder Silica nanopowder ( 30 nm) ceria powder (250 ~ 350nm) DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY

Conclusions (1) The nanosize of the colloidal silica can controlled by ethanol/TEOS molar ratio. (2) The size of the colloidal silica can controlled by base/TEOS molar ratio. (3) Monodispersed particles were prepared by hydrolysis of TEOS in semi-batch reactor, and allowed to coat by addition of ceria particles. DEPARTMENT OF NANOCHEMISTRY & BIOCHEMISTRY KONYANG UNIVERSITY