a b s t r a c t
A high intensity ultrasonic liquid processor was used to infuse 0.1–0.4 wt.% car... more a b s t r a c t
A high intensity ultrasonic liquid processor was used to infuse 0.1–0.4 wt.% carbon nanofibers (CNFs) into
the polyester matrix which was then mixed with a catalyst using a high speed mechanical agitator. Both
conventional and nanophased glass fiber reinforced polyester composites (GRPCs) were fabricated using
the vacuum assisted resin transfer molding (VARTM) process. Scanning electron microscope (SEM)
revealed best dispersion of CNFs in the 0.2 wt.% CNF-loaded resin. Proper resin flow and impregnation
of the glass fibers were also seen in the SEM micrographs. DMA studies exhibited about 49.5% increase
in the storage modulus and about 3 C increase in the glass transition temperature (Tg) due to the incorporation
of CNFs into the GRPC. TMA studies also showed better thermal stability and lower thermal
expansion in the CNF-loaded GRPC. CNF-loaded GRPC showed higher ILSS due to better interfacial
bonding between the fiber and matrix due to the presence of CNFs. Fracture morphology studied by both
optical microscope (OM) and SEM revealed better interfacial bonding in the CNF-loaded GRPC.
... Hassan Mahfuz 1 , Mujibur R. Khan 1 , Ashfaq Adnan 2 , Mohammad M. Hasan 3 , ... [7] Kuriger ... more ... Hassan Mahfuz 1 , Mujibur R. Khan 1 , Ashfaq Adnan 2 , Mohammad M. Hasan 3 , ... [7] Kuriger RJ, Alam MK, Anderson DP, Jacobsen RL, Processing and characterization of aligned vapor grown fiber reinforced polypropylene, Composites: Part A, 2002; 33: 53-62. ...
Volume 8: Mechanics of Solids, Structures and Fluids; Vibration, Acoustics and Wave Propagation, 2011
ABSTRACT In this study, a high-intensity ultrasonic liquid processor was used to obtain a homogen... more ABSTRACT In this study, a high-intensity ultrasonic liquid processor was used to obtain a homogeneous molecular mixture of epoxy resin and carbon nano fiber. The carbon nano fibers were infused into the part A of SC-15 (diglycidylether of Bisphenol A) through sonic cavitations and then mixed with part B of SC-15 (cycloaliphatic amine hardener) using a high-speed mechanical agitator. The trapped air and reaction volatiles were removed from the mixture using high vacuum. Nanophased epoxy with 2 wt.% CNF was then utilized in a vacuum assisted resin transfer molding (VARTM) set up with carbon fabric to fabricate laminated composites. The effectiveness of CNF addition on matrix dominated properties of composites has been evaluated by compression, open hole compression and inter-laminar shear. The compression strength, open hole compression strength and ILS were improved by 21%, 23% and 15%, respectively as compared to the neat composite.
IUTAM Symposium on Multi-Functional Material Structures and Systems, 2009
Effects of various functionalized multi-walled carbon nanotubes (MWCNT) on cure kinetics and flex... more Effects of various functionalized multi-walled carbon nanotubes (MWCNT) on cure kinetics and flexural properties of an epoxy based nanocomposite system were investigated. Chemical functionalization of MWCNT by oxidation (MWCNT-COOH), direct-fluorination (MWCNT-F) was confirmed by FTIR, and Raman spectroscopy. One weight percentage loading of MWCNT was used to prepare epoxy-based nanocomposites through in-situ polymerization. Curing kinetics showed that MWCNT-COOH and MWCNT-F
In the present paper, vapor-grown carbon nanofibers were mechanically dry-mixed with polypropylen... more In the present paper, vapor-grown carbon nanofibers were mechanically dry-mixed with polypropylene powder and extruded into filaments with a single screw extruder. Then tensile tests were performed on the single filament at a strain rate range from 0.02min−1 to 2min−1. Results indicate that both neat and nanophased polypropylene were strain rate-strengthening material. The tensile modulus and yield strength both increased
data were generated using 2024-T4 aluminum alloy specimens under stress ratios of -1 and -0.5 for... more data were generated using 2024-T4 aluminum alloy specimens under stress ratios of -1 and -0.5 for low-high, low-highmixed, high-low and high-low-mixed stress sequences. Analysis of the data using Kramer's equation has indicated that the predicted cumulative fatigue damage and fatigue life are in close agreement with experimental results for low-high and low-high-mixed stress sequences under all stress ratios, whereas the theoretical values for high-low and high-low-mixed stress sequences under all stress ratios are more conservative than those obtained experimentally.
Carbon nanotubes-mesostructured silica nanoparticles (CNT-MSN) composites were prepared by a simp... more Carbon nanotubes-mesostructured silica nanoparticles (CNT-MSN) composites were prepared by a simple one step method with various loading of CNT. Their surface properties were characterized by XRD, N 2 physisorption, TEM and FTIR, while the adsorption performance of the CNT-MSN composites were evaluated on the adsorption of methylene blue (MB) while varying the pH, adsorbent dosage, initial MB concentration, and temperature. The CNTs were found to improve the physicochemical properties of the MSN and led to an enhanced adsorptivity for MB. N 2 physisorption measurements revealed the development of a bimodal pore structure that increased the pore size, pore volume and surface area. Accordingly, 0.05 g L À1 CNT-MSN was able to adsorb 524 mg g À1 (q m ) of 60 mg L À1 MB at pH 8 and 303 K. The equilibrium data were evaluated using the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models, with the Langmuir model affording the best fit to the adsorption data. The adsorption kinetics were best described by the pseudo-first order model. These results indicate the potential of CNT-MSN composites as effective new adsorbents for dye adsorption.
Aluminum matrix composites reinforced with 0-5.0 wt.% multi-walled carbon nanotubes (MWNTs) were ... more Aluminum matrix composites reinforced with 0-5.0 wt.% multi-walled carbon nanotubes (MWNTs) were produced by spark plasma sintering (SPS). The composites with 61.0 wt.% MWNTs additions had higher thermal conductivity than the pure aluminum produced by the same SPS processing. The MWNTs/Al composites exhibited the maximum thermal conductivity of 199 W/m/K at 0.5 wt.% MWNTs. The enhancement of thermal conductivity is supported by the measured tensile strength. The MWNTs/Al composites exhibited the maximum tensile strength of 130 MPa also at 0.5 wt.% MWNTs. The contribution of carbon nanotubes to thermal conductivity of the composites was demonstrated by theoretical analysis. The results show that MWNTs reinforced aluminum matrix composite is a potential material for high thermal conductivity applications.
ABSTRACT This paper presents a study on the low-velocity impact response of sandwich panels with ... more ABSTRACT This paper presents a study on the low-velocity impact response of sandwich panels with different core structures. Sandwich panels were fabricated with neat and nanophased foam core and biaxial (±45) braided carbon fabric/SC-15 epoxy composite ...
A high intensity ultrasonic liquid processor was used to infuse carbon nanofibers (CNFs) into pol... more A high intensity ultrasonic liquid processor was used to infuse carbon nanofibers (CNFs) into polyester matrix which was then mixed with catalyst using a high speed mechanical agitator. Results showed the significant improvement in the dispersion of CNFs in sonication over the mechanical mixing method. Flexure tests performed on the neat polyester (NP), 0.1wt. %, 0.2 wt.%, 0.3 wt.% and 0.4 wt.% CNFfilled polyester (CNF-FP) showed 86% and 16% increase in flexural strength and modulus, respectively, compared to the unfilled polyester with increasing loading percentage of CNF up to 0.2%. Similar trend was found with CNF-filled glass reinforced polyester (CNF-FGRP) composites manufactured by vacuum assisted resin transfer molding (VARTM). Dynamic mechanical analysis (DMA) studies indicated an increasing trend of storage modulus and glass-transition-temperature (T g ) values of all nanophased composites compared to neat polyester. Scanning electron microscopy (SEM) micrographs of fracture surfaces revealed relatively smooth surface of neat polyester compared to the nanophased polyester.
a b s t r a c t
A high intensity ultrasonic liquid processor was used to infuse 0.1–0.4 wt.% car... more a b s t r a c t
A high intensity ultrasonic liquid processor was used to infuse 0.1–0.4 wt.% carbon nanofibers (CNFs) into
the polyester matrix which was then mixed with a catalyst using a high speed mechanical agitator. Both
conventional and nanophased glass fiber reinforced polyester composites (GRPCs) were fabricated using
the vacuum assisted resin transfer molding (VARTM) process. Scanning electron microscope (SEM)
revealed best dispersion of CNFs in the 0.2 wt.% CNF-loaded resin. Proper resin flow and impregnation
of the glass fibers were also seen in the SEM micrographs. DMA studies exhibited about 49.5% increase
in the storage modulus and about 3 C increase in the glass transition temperature (Tg) due to the incorporation
of CNFs into the GRPC. TMA studies also showed better thermal stability and lower thermal
expansion in the CNF-loaded GRPC. CNF-loaded GRPC showed higher ILSS due to better interfacial
bonding between the fiber and matrix due to the presence of CNFs. Fracture morphology studied by both
optical microscope (OM) and SEM revealed better interfacial bonding in the CNF-loaded GRPC.
... Hassan Mahfuz 1 , Mujibur R. Khan 1 , Ashfaq Adnan 2 , Mohammad M. Hasan 3 , ... [7] Kuriger ... more ... Hassan Mahfuz 1 , Mujibur R. Khan 1 , Ashfaq Adnan 2 , Mohammad M. Hasan 3 , ... [7] Kuriger RJ, Alam MK, Anderson DP, Jacobsen RL, Processing and characterization of aligned vapor grown fiber reinforced polypropylene, Composites: Part A, 2002; 33: 53-62. ...
Volume 8: Mechanics of Solids, Structures and Fluids; Vibration, Acoustics and Wave Propagation, 2011
ABSTRACT In this study, a high-intensity ultrasonic liquid processor was used to obtain a homogen... more ABSTRACT In this study, a high-intensity ultrasonic liquid processor was used to obtain a homogeneous molecular mixture of epoxy resin and carbon nano fiber. The carbon nano fibers were infused into the part A of SC-15 (diglycidylether of Bisphenol A) through sonic cavitations and then mixed with part B of SC-15 (cycloaliphatic amine hardener) using a high-speed mechanical agitator. The trapped air and reaction volatiles were removed from the mixture using high vacuum. Nanophased epoxy with 2 wt.% CNF was then utilized in a vacuum assisted resin transfer molding (VARTM) set up with carbon fabric to fabricate laminated composites. The effectiveness of CNF addition on matrix dominated properties of composites has been evaluated by compression, open hole compression and inter-laminar shear. The compression strength, open hole compression strength and ILS were improved by 21%, 23% and 15%, respectively as compared to the neat composite.
IUTAM Symposium on Multi-Functional Material Structures and Systems, 2009
Effects of various functionalized multi-walled carbon nanotubes (MWCNT) on cure kinetics and flex... more Effects of various functionalized multi-walled carbon nanotubes (MWCNT) on cure kinetics and flexural properties of an epoxy based nanocomposite system were investigated. Chemical functionalization of MWCNT by oxidation (MWCNT-COOH), direct-fluorination (MWCNT-F) was confirmed by FTIR, and Raman spectroscopy. One weight percentage loading of MWCNT was used to prepare epoxy-based nanocomposites through in-situ polymerization. Curing kinetics showed that MWCNT-COOH and MWCNT-F
In the present paper, vapor-grown carbon nanofibers were mechanically dry-mixed with polypropylen... more In the present paper, vapor-grown carbon nanofibers were mechanically dry-mixed with polypropylene powder and extruded into filaments with a single screw extruder. Then tensile tests were performed on the single filament at a strain rate range from 0.02min−1 to 2min−1. Results indicate that both neat and nanophased polypropylene were strain rate-strengthening material. The tensile modulus and yield strength both increased
data were generated using 2024-T4 aluminum alloy specimens under stress ratios of -1 and -0.5 for... more data were generated using 2024-T4 aluminum alloy specimens under stress ratios of -1 and -0.5 for low-high, low-highmixed, high-low and high-low-mixed stress sequences. Analysis of the data using Kramer's equation has indicated that the predicted cumulative fatigue damage and fatigue life are in close agreement with experimental results for low-high and low-high-mixed stress sequences under all stress ratios, whereas the theoretical values for high-low and high-low-mixed stress sequences under all stress ratios are more conservative than those obtained experimentally.
Carbon nanotubes-mesostructured silica nanoparticles (CNT-MSN) composites were prepared by a simp... more Carbon nanotubes-mesostructured silica nanoparticles (CNT-MSN) composites were prepared by a simple one step method with various loading of CNT. Their surface properties were characterized by XRD, N 2 physisorption, TEM and FTIR, while the adsorption performance of the CNT-MSN composites were evaluated on the adsorption of methylene blue (MB) while varying the pH, adsorbent dosage, initial MB concentration, and temperature. The CNTs were found to improve the physicochemical properties of the MSN and led to an enhanced adsorptivity for MB. N 2 physisorption measurements revealed the development of a bimodal pore structure that increased the pore size, pore volume and surface area. Accordingly, 0.05 g L À1 CNT-MSN was able to adsorb 524 mg g À1 (q m ) of 60 mg L À1 MB at pH 8 and 303 K. The equilibrium data were evaluated using the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models, with the Langmuir model affording the best fit to the adsorption data. The adsorption kinetics were best described by the pseudo-first order model. These results indicate the potential of CNT-MSN composites as effective new adsorbents for dye adsorption.
Aluminum matrix composites reinforced with 0-5.0 wt.% multi-walled carbon nanotubes (MWNTs) were ... more Aluminum matrix composites reinforced with 0-5.0 wt.% multi-walled carbon nanotubes (MWNTs) were produced by spark plasma sintering (SPS). The composites with 61.0 wt.% MWNTs additions had higher thermal conductivity than the pure aluminum produced by the same SPS processing. The MWNTs/Al composites exhibited the maximum thermal conductivity of 199 W/m/K at 0.5 wt.% MWNTs. The enhancement of thermal conductivity is supported by the measured tensile strength. The MWNTs/Al composites exhibited the maximum tensile strength of 130 MPa also at 0.5 wt.% MWNTs. The contribution of carbon nanotubes to thermal conductivity of the composites was demonstrated by theoretical analysis. The results show that MWNTs reinforced aluminum matrix composite is a potential material for high thermal conductivity applications.
ABSTRACT This paper presents a study on the low-velocity impact response of sandwich panels with ... more ABSTRACT This paper presents a study on the low-velocity impact response of sandwich panels with different core structures. Sandwich panels were fabricated with neat and nanophased foam core and biaxial (±45) braided carbon fabric/SC-15 epoxy composite ...
A high intensity ultrasonic liquid processor was used to infuse carbon nanofibers (CNFs) into pol... more A high intensity ultrasonic liquid processor was used to infuse carbon nanofibers (CNFs) into polyester matrix which was then mixed with catalyst using a high speed mechanical agitator. Results showed the significant improvement in the dispersion of CNFs in sonication over the mechanical mixing method. Flexure tests performed on the neat polyester (NP), 0.1wt. %, 0.2 wt.%, 0.3 wt.% and 0.4 wt.% CNFfilled polyester (CNF-FP) showed 86% and 16% increase in flexural strength and modulus, respectively, compared to the unfilled polyester with increasing loading percentage of CNF up to 0.2%. Similar trend was found with CNF-filled glass reinforced polyester (CNF-FGRP) composites manufactured by vacuum assisted resin transfer molding (VARTM). Dynamic mechanical analysis (DMA) studies indicated an increasing trend of storage modulus and glass-transition-temperature (T g ) values of all nanophased composites compared to neat polyester. Scanning electron microscopy (SEM) micrographs of fracture surfaces revealed relatively smooth surface of neat polyester compared to the nanophased polyester.
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Papers by Shaik Jeelani
A high intensity ultrasonic liquid processor was used to infuse 0.1–0.4 wt.% carbon nanofibers (CNFs) into
the polyester matrix which was then mixed with a catalyst using a high speed mechanical agitator. Both
conventional and nanophased glass fiber reinforced polyester composites (GRPCs) were fabricated using
the vacuum assisted resin transfer molding (VARTM) process. Scanning electron microscope (SEM)
revealed best dispersion of CNFs in the 0.2 wt.% CNF-loaded resin. Proper resin flow and impregnation
of the glass fibers were also seen in the SEM micrographs. DMA studies exhibited about 49.5% increase
in the storage modulus and about 3 C increase in the glass transition temperature (Tg) due to the incorporation
of CNFs into the GRPC. TMA studies also showed better thermal stability and lower thermal
expansion in the CNF-loaded GRPC. CNF-loaded GRPC showed higher ILSS due to better interfacial
bonding between the fiber and matrix due to the presence of CNFs. Fracture morphology studied by both
optical microscope (OM) and SEM revealed better interfacial bonding in the CNF-loaded GRPC.
A high intensity ultrasonic liquid processor was used to infuse 0.1–0.4 wt.% carbon nanofibers (CNFs) into
the polyester matrix which was then mixed with a catalyst using a high speed mechanical agitator. Both
conventional and nanophased glass fiber reinforced polyester composites (GRPCs) were fabricated using
the vacuum assisted resin transfer molding (VARTM) process. Scanning electron microscope (SEM)
revealed best dispersion of CNFs in the 0.2 wt.% CNF-loaded resin. Proper resin flow and impregnation
of the glass fibers were also seen in the SEM micrographs. DMA studies exhibited about 49.5% increase
in the storage modulus and about 3 C increase in the glass transition temperature (Tg) due to the incorporation
of CNFs into the GRPC. TMA studies also showed better thermal stability and lower thermal
expansion in the CNF-loaded GRPC. CNF-loaded GRPC showed higher ILSS due to better interfacial
bonding between the fiber and matrix due to the presence of CNFs. Fracture morphology studied by both
optical microscope (OM) and SEM revealed better interfacial bonding in the CNF-loaded GRPC.