Multi-walled Carbon Nanotubes In Solution Research Articles

Effect of black ink loading on the properties of multi-walled carbon nanotubes/glass fibre/epoxy laminated hybrid composites

The demand for weight reduction is driven by the demand for better fuel efficiency and reduction of emissions. Polymer composites can offer lightweight benefits from 15 to 25% for glass fibre-reinforced composites in comparison to other metallic structure. Modification has been made to the fibre and polymer matrix by integrating with nanofiller, for example, multi-walled carbon nanotubes (MWCNT). In the present study, commercial black ink was utilized as dispersing agent to disperse pristine MWCNT in deionized water. The MWCNT solution was applied to the 3-ply glass fibre (GF)/epoxy using spreading method. The amount of MWCNT was fixed at 1.4 vol% whereas the black ink loading was varied from 1.4 to 5.6 vol%. The results of hybrid composites (3-ply MWCNT/GF/epoxy) were compared with 3-ply and 4-py GF/epoxy laminated composites (3GF and 4GF). It was found that about 100 and 14% improvement in flexural strength and modulus were observed for hybrid composites compared to 4GF, respectively. The storage modulus also increased up to 50% compared to 4GF. The superior properties of hybrid composites was attributed to the less MWCNT agglomerations occur during the fabrication process hence results in a good dispersion of MWCNT fillers on the fibres. This indicates that addition of MWCNT in the glass fibre laminates with the aid of black ink is able to reduce the number of glass fibre laminate and hence reduce the weight of the composite structure.

Nanocrystalline LiCo0.8Fe0.2PO4 / Multi-Walled Carbon Nanotubes Positive Electrode for 5-Volts Class Lithium Ion Batteries

1. Introduction Lithium cobalt phosphate (LiCoPO4) with olivine structure has attracted much attention as a new positive electrode material for lithium ion batteries because of its high potential (4.8V vs. Li/Li+), theoretical capacity (167 mAh g-1) and thermal stability due to the P-O covalent bonding. However, the practical use of LiCoPO4 has been limited by the capacity fading during cycling due to the electrolyte oxidation and irreversible structure changes such as amorphization and anti-site defects of the material during charge and discharge1). Besides, it suffers from its poor rate performance related to the inherently low electron conductivity (<10-9 S cm-1)2) and Li+ diffusivity (<10-13 cm2 s-1)2) due to its b-axis oriented diffusion path. To overcome these limitations, we have synthesized Fe-substituted LiCoPO4 (LiCo0.8Fe0.2PO4) nanoparticles which are highly dispersed within a multi-walled carbon nanotube (MWCNT) matrix via an original in-situ material synthesis method called ultracentrifugation (UC) treatment3,4). Here, we also report about the influence of Fe substitution on cycle and rate performances of LiCo0.8Fe0.2PO4. 2. Experimental UC treatment was carried out on the prepared mixture of Co(CH3COO)2・4H2O, Fe(CH3COO)2, CH3COOLi, citric acid, MWCNT and H3PO4 aqueous solution. Obtained composites were electrochemically characterized using a 2032 coin half-cell with Li metal in 1M LiPF6 / EC:PC:DMC (1:1:3, volume ratio). Physicochemical characterizations of the LiCo0.8Fe0.2PO4/ MWCNT composite were conducted by HRTEM, XRD, XPS, XAFS measurements and Mössbauer spectroscopy. 3. Results and Discussion The XRD pattern of LiCo0.8Fe0.2PO4 / MWCNT composite indicates an olivine structure, without impurity phases. The combination of XRD, XPS, XAFS and Mössbauer analysis suggests that substituted Fe3+ into LiCoPO4 crystals was not placed in the Co2+ site, but in the Li+ site. The result of HRTEM observation indicates that LiCo0.8Fe0.2PO4 nanocrystals (ca. 100 nm) were highly dispersed within a MWCNT matrix. In addition, HRTEM images of LiCo0.8Fe0.2PO4 / MWCNT composite showed that a substitution of Fe3+ into LiCoPO4 crystals prevents degradations such as amorphization of LiCoPO4and electrolyte decomposition during charge and discharge processes. Then, LiCo0.8Fe0.2PO4 / MWCNT composite showed a higher discharge capacity of 130 mAh g-1 than LiCoPO4 / MWCNT composite and enabled a 100C (36 seconds) rate discharge with 45 mAh g-1. Furthermore, the obtained composite showed stable cycle performance with 81 % of capacity retention after 100 cycles at 0.2C. These enhancements were achieved by the combination of an entanglement between nanocrystalline LiCo0.8Fe0.2PO4 and MWCNT matrix and Fe3+ substitution in the Li+ site of LiCoPO4. The Fe3+substitution gives a “pillar effect” which effectively prevents an irreversible crystal structure change and electrolyte decomposition during charge and discharge processes, resulting in the stable cycle performance. References 1) A. Boulineau et al., Chem. Mater., 27, 802 (2015). 2) S. Brutti et al., ACS Symposium Series, (2013). 3) K. Naoi et al., Acc. Chem. Res., 46, 1075 (2013). 4) K. Naoi et al., Energy Environ. Sci., 5, 9363 (2012).

Performance of Platinum Nanoparticles / Multiwalled Carbon Nanotubes / Bacterial Cellulose Composite as Anode Catalyst for Proton Exchange Membrane Fuel Cells

Highly dispersed platinum (Pt) nanoparticles / multiwalled carbon nanotubes (MWCNTs) on bacterial cellulose (BC) as anode catalysts for proton exchange membrane fuel cells (PEMFC) were prepared with various precursors and their electro-catalytic activities towards hydrogen oxidation at 70 oC under non-humidified conditions. The composite was prepared by deposition of Pt nanoparticles and MWCNTs on BC gel by impregnation method using a water solution of metal precursors and MWCNTs followed by reducing reaction using a hydrogen gas. The composite was characterized by using TEM (transmission electron microscopy), EDS (energy dispersive spectroscopy), and XRD (X-ray diffractometry) techniques. TEM images and XRD patterns both lead to the observation of spherical metallic Pt nanoparticles with mean diameter of 3-11 nm well impregnated into the BC fibrils. Preliminary tests on a single cell indicate that renewable BC is a good prospect to be explored as a membrane in fuel cell field.

Electrical double layer ion transport with cell voltage-pulse potential coupling circuit for separating dilute lead ions from wastewater

Continuous separation of dilute Pb2+ from wastewater was demonstrated by using a membrane containing highly conductive multiwalled carbon nanotubes (MWCNTs) in an electrochemically switched ion permselective (ESIP) process, with a cell voltage–pulse potential coupling circuit. The membrane with high selectivity for Pb2+ separation was fabricated by pressure filtering MWCNT solution through a polytetrafluoroethylene (PTFE) film. In the separation system, the directional uptake and release of Pb2+ were realized by modulating the positive and negative charge densities on the electrical double layer (EDL) of the membrane, together with the application of an external electric field. The effects of the operating parameters on the flux of Pb2+ and membrane permselectivity were investigated. The highest Pb2+ flux across the membrane occurred with considerable permselectivity at a cell voltage of 0.8V, a pulse width of 40s, and a membrane MWCNT content of 30mg. The system reduced the Pb2+ concentration in the solution from 30 to 0.36ppm with a current efficiency of 46.1%. Such a novel EDL membrane-based ESIP system could be used for wastewater treatment.

Quantitative evaluation of multi-wall carbon nanotube uptake by terrestrial plants

The extent and mechanisms by which multi-wall carbon nanotubes (MWCNTs) are accumulated by terrestrial plant species is currently unknown. In this study, we successfully measured the MWCNTs content in different plant (Arabidopsis thaliana, rice, maize and soybean) using 14C labeled MWCNTs. Quantitative relationships among the uptake amount of MWCNTs in different Arabidopsis tissues, the physiological (water loss, pigment content, and total protein content) and biochemical parameters (antioxidant enzyme activities) were further evaluated. Our results indicated that changes in biochemical parameters were much more sensitive than physiological parameters. The lowest CAT activities in the treatment with (1,3-dinitrobenzene + MWCNTs) were only 0.13- fold of that in the 1,3-dinitrobenzene alone treatment, suggesting MWCNTs could alleviate the toxicity to Arabidopsis. Due to the toxicity caused by small polar aromatic organic molecules (SPAOMs), the MWCNTs uptake in leaf in the treatment with (2,4-dichlorophenol + MWCNTs) was only 0.07-fold relative to the MWCNTs alone treatment. Hydrodynamic diameter of MWCNTs in solution did not significantly affect MWCNTs uptake. Uptake models for MWCNTs into root and leaf tissue were constructed via stepwise multiple linear regression analysis. This study will provide important information for the accurate determination of risk associated with MWCNT exposure.

Effects of Solvent on the Optical Nonlinearities of Multi-Walled Carbon Nanotubes under the Picosecond Laser Pulses

Based on Z-scan technique, the nonlinear absorption and refraction characteristics of multi-walled carbon nanotubes (MWNT) in chloroform , deionized water and isopropyl alcohol have been studied under the picosecond (ps) laser pulses, respectively. The experimental results show that the nonlinear absorption characteristics of the MWNT in chloroform, deionized water and isopropyl alcohol are all saturable absorption, and their nonlinear absorption coefficients are 1.83×10-11 m/W, 1.97×10-11 m/W, 2.31×10-11 m/W, respectively. The nonlinear refraction characteristics of the three solutions are all self-focusing, and the nonlinear refractive coefficients are 4.37×10-12 esu, 1.68×10-12 esu, 8.34×10-13 esu, respectively. The third-order nonlinear susceptibilities of the three solutions are 6.32×10-13 esu, 5.62×10-13 esu, 7.11×10-12 esu, respectively. The experimental results indicate that the nonlinear optical property of the MWNT isopropyl alcohol solution is the strongest, and the MWNT deionized water solutions is the weakest. The solvents have a big effects on the nonlinear optical properties of MWNT solutions.

Positioning and aligning CNTs by external magnetic field to assist localised epoxy cure

Abstract This work focuses on the generation of conductive networks through the localised alignment of nano fillers, such as multi-walled carbon nanotubes (MWCNTs). The feasibility of alignment and positioning of functionalised MWCNTs by external DC magnetic fields was investigated. The aim of this manipulation is to enhance resin curing through AC induction heating due to hysteresis losses from the nanotubes. Experimental analyses focused on in-depth assessment of the nanotube functionalisation, processing and characterisation of magnetic, rheological and cure kinetics properties of the MWCNT solution. The study has shown that an external magnetic field has great potential for positioning and alignment of CNTs. The study demonstrated potential for creating well-ordered architectures with an unprecedented level of control of network geometry. Magnetic characterisation indicated cobalt-plated nanotubes to be the most suitable candidate for magnetic alignment due to their high magnetic sensitivity. Epoxy/metal-plated CNT nanocomposite systems were validated by thermal analysis as induction heating mediums. The curing process could therefore be optimised by the use of dielectric resins. This study offers a first step towards the proof of concept of this technique as a novel repair technology.

Carbon Nanotube Multilayer Nanocoatings Prevent Flame Spread on Flexible Polyurethane Foam

In an effort to protect polyurethane foam (commonly used as cushioning in upholstered furniture) from fire using environmentally benign chemistries, nanocomposite thin films are deposited using water‐based solutions of cationic‐ and anionic‐stabilized multiwalled carbon nanotubes (MWCNTs). The open‐celled foam is coated using layer‐by‐layer (LbL) assembly to produce uniform protective layers up to 600 nm thick, comprised of cationic polyethylenimine modified with pyrene (PEI‐Py), anionic poly(acrylic acid) (PAA), and MWCNT. Film thickness is found to rely heavily on the PAA‐stabilized MWCNT solution. Coatings of only six [PEI‐Py/PAA+MWCNT] bilayers (BL) show tremendous reductions in peak heat release rate (up to 67%) and total smoke release (up to 80%) for the polyurethane foam. This same coating significantly improves the performance of the polyurethane when exposed to horizontal and vertical flame tests. With 9 BL, the foam successfully withstands a vertical burn test, self‐extinguishing immediately after removal of the test flame. These dramatic reductions in foam flammability are unprecedented and are attributed to the protective nature of the carbon‐based char formed from the coating that acts as a protective barrier. image

Rational Construction of a Functionalized V2O5 Nanosphere/MWCNT Layer‐by‐Layer Nanoarchitecture as Cathode for Enhanced Performance of Lithium‐Ion Batteries

Vanadium pentoxide (V2O5) has received considerable attention owing to its potential application in energy storage with high specific capacity (294 mAh g−1). However, the development of V2O5 cathodes has been limited by the intrinsically low electrical conductivity and slow electrochemical kinetics resulting in a significant capacity decay. In this article, in order to overcome the issues, V2O5 nanospheres and multiwalled carbon nanotubes (MWCNTs) are used to fabricate layer‐by‐layer composited paper as the cathode, which is prepared via electrostatic interaction and vacuum filtration by alternating the positively charged V2O5 nanospheres and the negatively charged terminated MWCNT solutions. As a result, the V2O5 nanospheres are closely intercalated between the adjacent MWCNT layers leading to minimize the disadvantage voids and enhance the overall conductivity of the composited electrode, which exhibits an enhanced cycling durability as well as improved rate capability.

Single carbon nanotube-based reversible regulation of biological motor activity.

Because of their small size and high thermal conductivity, carbon nanotubes (CNTs) are excellent candidates for exploring heat transfer at the level of individual molecules in biological research. With a view toward examining the thermal regulation of single biomolecules, we here developed single CNTs as a new platform for observing the motile activity of myosin motors. On multiwall CNTs (diameter ∼170 nm; length ∼10 μm) coated with skeletal-muscle myosin, the ATP-driven sliding of single actin filaments was clearly observable. The normal sliding speed was ∼6 μm/s. Locally irradiating one end of the CNT with a red laser (642 nm), without directly irradiating the active myosin motors, accelerated the sliding speed to ∼12 μm/s, indicating the reversible activation of protein function on a single CNT in real time. The temperature along the CNT, which was estimated from the temperature-dependence of the sliding speed, decreased with the distance from the irradiated spot. Using these results with the finite element method, we calculated a first estimation of the thermal conductivity of multiwall CNTs in solution, as 1540 ± 260 (Wm(-1) K(-1)), which is consistent with the value estimated from the width dependency of multiwall CNTs and the length dependency of single-wall CNTs in a vacuum or air. The temporal regulation of local temperature through individual CNTs should be broadly applicable to the selective activation of various biomolecules in vitro and in vivo.

Novel Dispersion of MWCNTs in Polystyrene Polymer Induced by the Addition of 3-Hydroxy-2-Napthoic Acid

This article reports an extensive investigation of the unique dispersion behavior of solutions with multi-walled carbon nanotubes (MWCNTs) and 3-hydroxy-2-napthoic acid (β-HNA) in tetrahydrofuran (THF) solvent, which results into a multifold enhancement in the electrical properties of polystyrene (PS). A number of solutions with 0.4% of MWCNTs (w/v) and β-HNA (0–1%, w/v) in THF were prepared separately. MWCNTs precipitated out in THF solvent shortly after the preparation and formed two distinct phase regions (2φ). Gratifyingly, addition of β-HNA solution to the MWCNTs solution offered an unprecedented enhancement in the dispersion of MWCNTs. Such dispersion in solutions with only 0.02% β-HNA (w/v) was found to be stable up to 2 weeks at room temperature. FTIR spectroscopy was incorporated to illustrate the adsorption of β-HNA onto the surface of carbon nanotubes (CNTs). After this successful dispersion, nanocomposites solutions comprising of 0.067% β-HNA (w/v), 6.7% PS (w/v), and varying concentrations of MWCNTs (0–0.33%, w/v) were prepared. A remarkable dispersion behavior of MWCNTs in the presence of polymer was also observed. Finally, thin films made up of consistent polystyrene/β-HNA concentrations and increasing amounts of MWCNTs were prepared by casting technique to investigate the influence of dispersion on the electrical properties of the film. The dispersion significantly affected the DC electrical conductivity and incorporation of 5% MWCNTs elevated the electrical conductivity up to 10 orders of magnitude with respect to neat PS.

Selective Solar Absorption of Nanofluids for Photovoltaic/Thermal Collector Enhancement

ABSTRACTSelectively-absorbing nanofluids were synthesized and evaluated for spectrum splitting PV/T collector applications. Core-shell silver-silica (Ag-SiO2) nanodiscs and multi-walled carbon nanotubes (MWCNTs) were suspended in water at varying dilutions and then tested as an optical filter placed between a light source and silicon solar cell. A concentrated Ag-SiO2 solution diluted with an aqueous MWCNT solution yielded higher thermal efficiencies than when diluted by the same volume of water. However, AgSiO2-MWCNT mixtures yielded a lower electrical output than aqueous AgSiO2 dilutions due to the non-selective absorption of MWCNTs. The most concentrated Ag-SiO2 nanofluid (0.026wt%) yielded a peak thermal efficiency of 65%, to deliver the greatest combined efficiency of ∼72%.

Electromechanical Properties of Carbon Nanotube Infused Polyacrylamide Hydrogel

ABSTRACTTypically, electroresponsive hydrogels have either a high electrical conductivity with little swelling or large swelling with low conductivity. This paper investigates a method of maintaining high swelling capabilities and increasing electrical conductivity by infusing multiwalled carbon nanotubes (MWCNTs) into a hydrolyzed polyacrylamide hydrogel. Various concentrations of MWCNT and Nafion solutions infused into the hydrogel were investigated. Optical microscopy analysis showed aggregates of carbon nanotube bundles at the macroscale, whereas electron microscopy revealed homogeneous dispersion of carbon nanotube in the polymer matrix at the microscale. Electrical conductivity measurements demonstrated an increase from 0.02 to 0.11 mS cm–1 with infused MWCNT. The MWCNT‐infused hydrogels demonstrated a 400% increase in deswelling capabilities during an applied electrical stimulus compared to a noninfused hydrogel. In conclusion, infusing the MWCNT into the hydrogel increased its electrical conductivity, which allows the hydrogel to deswell more rapidly with an applied electrical bias without compromising its mechanical or swelling properties.

Biomineralization on polymer-coated multi-walled carbon nanotubes with different surface functional groups

Substrate-controlled mineralization from simulated body fluid (SBF) has been studied as a model for biomineralization and for the synthesis of bioinspired hybrid materials. The mineralization procedure is complex and the features of final minerals are affected by many factors. Surface functional groups are among them and play important roles in inducing nucleation, crystal growth and transformation. In this study, multi-walled carbon nanotubes (MWCNTs) were surface-modified with poly(acrylic acid), polyacrylamide or poly(hydroxyethyl methylacrylate), and used as templates for biomineralization. The polymer coating was gained via photo-initiated polymerization of monomers and adsorption of polymer chains onto MWCNTs in solution. Then, the modified MWCNTs with different surface functional groups were incubated in 1.5 times SBF for different times to compare the effect of carboxyl, acylamino and hydroxyl group on calcium phosphate formation. The study involved various characterizations such as morphology observation, weight increase, chemical and crystal structures of deposited minerals at different soaking time points. In all cases, carbonated calcium-deficient hydroxyapatite (CDHA) was identified after 7 days immersion. The continuously growing mineral crystals would wrap MWCNTs into spherical composite particles ultimately. However, the rates of nucleation and crystal growth depended on the type of surface functional groups, in an order of COOH>CONH2>OH. And their different charge characteristics led to different Ca/P ratios in initially formed minerals. It revealed that acylamino group, which demonstrated the lowest Ca/P ratio in nucleation stage, was helpful to obtain c-axis preferentially oriented morphology resembling the HA structure in natural bone tissue.

The effect of multiwall carbon nanotube additions on the thermo-mechanical, electrical, and morphological properties of gelatin–polyvinyl alcohol blend nanocomposite

A highly stable and uniform dispersion of multiwall carbon nanotubes in aqueous solution was achieved to prepare multiwall carbon nanotubes/gelatin–polyvinyl alcohol nanocomposites with varying multiwall carbon nanotubes content using solution casting. Optical microscopic images confirmed the homogenous dispersion and distribution of multiwall carbon nanotubes in solution and polymer matrix. The tensile strength and tensile modulus of the composite containing 1% multiwall carbon nanotubes (wt/wt) were found to increase by 128.1 and 284.8% compared to that of the gelatin–polyvinyl alcohol blend. Dynamic mechanical analysis revealed an increase in the storage modulus and a decrease in the loss factor (tan delta) for the composite. Electrical properties exhibited a typical percolation behavior when a small amount of multiwall carbon nanotubes (0.1 wt%) was loaded. X-ray diffraction showed that incorporation of multiwall carbon nanotubes increased the crystallinity. Scanning electron microscopy also showed a homogeneous distribution of multiwall carbon nanotubes in the composite matrix. The nanocomposites were further characterized by Fourier transform infrared (FTIR), thermo-gravimetric analysis, and differential scanning calorimetry.

Nickel oxide nanoparticles prepared by gelatin and their application toward the oxygen evolution reaction

Green synthesis of pure nickel oxide nanoparticles (nano-NiO) in aqueous medium has been carried out using gelatin. The particles have been characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray (EDAX). Gelatin plays an important role in the formation of the nano-NiO. TEM image shows the formation of nano-NiO with average particle size 16 nm, which agrees well with the XRD data. Moreover, efficient and stable nano-NiO-based anodes were fabricated by casting of the nano-NiO and multi-walled carbon nanotube solution (NiO-MWNT) on glassy carbon (NiO-MWNT/GC), platine (NiO-MWNT/Pt), and carbon paste (NiO-MWNT/CP) electrodes. The electrocatalysis of oxygen evolution reaction (OER) at modified electrodes has been examined using linear scanning voltammetry (LSV). The OER is significantly enhanced upon modification of the electrodes with NiO-MWNT, as demonstrated by a negative shift in the LSV curves at the NiO-MWNT-modified electrodes compared to that obtained at the unmodified ones. The maximum electrocatalytic activity toward the OER was obtained in alkaline media. The values of energy saving of oxygen gas at a current density of 5 mA cm−2 Pt, CP, and GC electrodes are 14.1, 16.0, and 21.6 kW h kg−1, respectively. The low cost as well as the marked stability of the modified electrodes makes them promising candidates in industrial water electrolysis process.

Fabrication of novel functionalized multi-walled carbon nanotube immobilized hollow fiber membranes for enhanced performance in forward osmosis process

A novel functionalized multi-walled carbon nanotube (MWCNT) immobilized polyethyleneimine–poly(amide–imide) (PEI–PAI) hollow fiber membrane was designed and fabricated using an easily scalable method. PAI hollow fiber was spun via phase inversion, followed by functionalized MWCNTs immobilization via vacuum filtration before a chemical post-treatment using PEI was applied to obtain a positively charged selective layer. The resulting membranes were evaluated in the forward osmosis (FO) process. The membrane prepared using a 0.62mg/L of MWCNTs solution shows a pure water permeability of 4.48L/m2hbar with a MgCl2 rejection of 87.8% at 1bar. This is a 44% enhancement in water permeability without significant compromise on the salt permeability when compared to membranes without MWCNTs. In addition, FO water flux of membranes prepared using 0.31 and 1.25mg/L of MWCNTs solutions have also been enhanced up to 29% without compromising the solute flux in the active layer facing feed water orientation using 0.5M MgCl2 solution as the draw solution and deionized water as the feed water. These encouraging results suggest that hollow fiber membranes immobilized with commercial MWCNTs exhibit good potential to be further developed for applications in the FO process.

Depolarized dynamic light scattering study of multi-walled carbon nanotubes in solution

Depolarized dynamic light scattering study of multi-walled carbon nanotubes in solution

Kinetics of hydrogen evolution from acidic solutions on pressed micro graphite electrodes modified with carbon nanotubes. II. Impedance studies

The kinetics of hydrogen evolution on pressed micro graphite electrodes modified with multi-walled carbon nanotubes (MWCNTs) is studied in chloride environments with a constant ionic strength equal to unity with the use of impedance spectroscopy. The impedance of electrodes containing from 0.1 to 8 wt % MWCNTs in solutions of a general composition x M HCl + (1 − x) M NaCl at a currentless potential and at E = −0.6 V (N.H.S.) is interpreted as impedance of porous electrodes. The data obtained indicate the absence of diffusion limitations of the processes that proceed at a currentless potential and of the hydrogen evolution reaction. When the content of MWCNTs in a micro graphite electrode increases to 8 wt % at E = −0.6 V (N.H.S.), the increase in the contribution of the double layer capacitance and the adsorption capacitance to the Faraday impedance is the most pronounced, which means that MWCNTs promote a specific interaction of the electrolyte ions and atomic hydrogen with the surface of the cathodically polarized electrode.

Fabrication and mechanical properties of porous Al2O3-based multiphase composite through surface charge

The bi-reinforcement phases of multi-walled carbon nanotubes (MWCNTs) and TiC have been incorporated into Al2O3 matrix prepared with Al(OH)3, to improve the mechanical properties of porous Al2O3 matrix. The reinforcement phases were mixed using their surface charges for the uniform dispersion into the Al2O3 matrix, with the content of reinforcement phase and the variation of potential hydrogen in a suspension. MWCNTs were purified and modified by an acid to enhance their dispersibility in an aqueous solution. The modified MWCNTs were added in the TiC suspension with potential hydrogen of 7. The TiC-coated MWCNTs solution was filtered, dried, and heat-treated at 500℃. The prepared TiC-coated MWCNTs were mixed with the Al(OH)3 solution with potential hydrogen of 2 and filtered at room temperature. The prepared multiphase composites show higher mechanical properties than porous Al2O3 matrix because of the reinforcing effect of TiC particle.