Surface functionalization of multiwalled carbon nanotube for biosensor device application

Fatin, M. F.; Ruslinda, A. Rahim; Arshad, M. K. Md; Hashim, U.; Norhafizah, S.; Farehanim, M. A.

doi:10.1109/smelec.2014.6920876

Cited by 9 publications

(8 citation statements)

References 11 publications

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“…The peaks’ positions and their assignments are listed in Table 1 . The wider and lower-intensity beaks of the TNR-PES membrane in Figure 5 A were caused by the TiO 2 suppressing effect [ 35 , 36 , 37 , 38 ]. Meanwhile, Figure 5 B shows new function groups for PES/TNR-MWCNT, as assigned in Table 1 .…”

Section: Resultsmentioning

confidence: 99%

Polyethersulfone Blended with Titanium Dioxide Nanoribbons/Multi-Wall Carbon Nanotubes for Strontium Removal from Water

et al. 2022

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Nanofiltration methods were used and evaluated for strontium removal from wastewater. The phase inversion method was used to create a variety of polyethersulfone (PES)/TiO2 nanoribbons (TNRs)–multi-walled carbon nanotubes (MWCNTs) membranes with varied ratios of TNR-MWCNT nanocomposite. The hydrothermal technique was applied to synthesize the nanocomposite (TNRs-MWCNTs), which was then followed by chemical vapor deposition (CVD). The synthesized membranes were characterized by scanning electron microscopy (SEM), transmission electron microscopy, and FTIR. TNR macrovoids are employed as a support for the MWCNT growth catalyst, resulting in a TNR-MWCNT network composite. The hydrophilicity, mechanical properties, porosity, filtration efficiency of the strontium-containing samples, water flux, and fouling tendency were used to assess the performance of the synthesized membranes. The effect of feed water temperature on water flux was investigated as well as its effect on salt rejection. As the temperature increased from 30 to 90 °C, the salt rejection decreased from 96.6 to 82% for the optimized 0.7 PES/TNR-MWCNT membrane, whereas the water flux increased to ≈150 kg/m2. h. Double successive filtration was evaluated for its high efficiency of 1000 ppm strontium removal, which reached 82.4%.

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Section: Resultsmentioning

confidence: 99%

Polyethersulfone Blended with Titanium Dioxide Nanoribbons/Multi-Wall Carbon Nanotubes for Strontium Removal from Water

et al. 2022

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“…The raw MWCNT has also show the presence of C-O peak which may rose from the oxidation with the environment. The peak at 1680-1640 cm -1 (C=C stretch) and 1500-1400 cm -1 (C-C stretch) were the result of carbon hexagonal ring which indicated as the MWCNT characteristic vibration [12,13,14]. Large peak at the O-H stretching vibration was due to interference of water molecule in air during KBr pellet preparation or partially dried sample.…”

Section: Resultsmentioning

confidence: 99%

Oxidation functionalization of multiwalled carbon nanotube by mild acid sonication

Fatin

Ruslinda

Norhafizah

et al. 2014

2014 IEEE Conference on Biomedical Engineering and Sciences (IECBES)

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Multiwalled carbon nanotube (MWCNT) has excellent properties in thermal and electrical conductivities, high tensile strength and surface area and low mass over volume. However, the usage is still limited due to its inert characteristic. MWCNT surface is hydrophobic and not miscible in most solvents. This work emphasize on simple and practical method of functionalization by sonication in mild acid condition. 6M of Nitric acid and Sulfuric acid mixture (Method I) and 6M of Nitric acid (Method II) were demonstrated as an oxidizing agent to introduce carboxyl functional group on MWCNTs surface. Both type of functionalization has demonstrated carboxyl formation but functionalization in acid mixture was chosen to be used for further study for aptamer immobilization. FTIR and SEM have been used to investigate the binding properties and surface morphology respectively. The functionalization time has also been studied by using dispersability test which resulted in good dispersion after 1 hour of functionalization.

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“…The process is repeated five times and the average of the readings is reported [39]. Figure 1A shows that increasing the nanomaterial percentage in the membrane results in lower contact angle readings, indicating that increasing the nanomaterial percentage increases hydrophilicity [40,41]. Pure-PES membranes have the largest contact angle and are the least hydrophilic.…”

Section: Hydrophilicity Of Synthesized Membranesmentioning

confidence: 99%

Removal of Scale-Forming Ions and Oil Traces from Oil Field Produced Water Using Graphene Oxide/Polyethersulfone and TiO2 Nanoribbons/Polyethersulfone Nanofiltration Membranes

et al. 2022

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Treatment of produced water in oil fields has become a tough challenge for oil producers. Nanofiltration, a promising method for water treatment, has been proposed as a solution. The phase inversion technique was used for the synthesis of nanofiltration membranes of polyethersulfone embedded with graphene oxide nanoparticles and polyethersulfone embedded with titanium nanoribbons. As a realistic situation, water samples taken from the oil field were filtered using synthetic membranes at an operating pressure of 0.3 MPa. Physiochemical properties such as water flux, membrane morphology, flux recovery ratio, pore size and hydrophilicity were investigated. Additionally, filtration efficiency for removal of constituent ions, oil traces in water removal, and fouling tendency were evaluated. The constituent ions of produced water act as the scaling agent which threatens the blocking of the reservoir bores of the disposal wells. Adding graphene oxide (GO) and titanium nanoribbons (TNR) to polyethersulfone (PES) enhanced filtration efficiency, water flux, and anti-fouling properties while also boosting hydrophilicity and porosity. The PES-0.7GO membrane has the best filtering performance, followed by the PES-0.7TNR and pure-PES membranes, with chloride salt rejection rates of 81%, 78%, and 35%; oil rejection rates of 88%, 85%, and 71%; and water fluxes of 85, 82, and 42.5 kg/m2 h, respectively. Because of its higher hydrophilicity and physicochemical qualities, the PES-0.7GO membrane outperformed the PES-0.7TNR membrane. Nanofiltration membranes embedded with nanomaterial described in this work revealed encouraging long-term performance for oil-in-water trace separation and scaling agent removal.

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Surface functionalization of multiwalled carbon nanotube for biosensor device application

Cited by 9 publications

References 11 publications

Polyethersulfone Blended with Titanium Dioxide Nanoribbons/Multi-Wall Carbon Nanotubes for Strontium Removal from Water

Polyethersulfone Blended with Titanium Dioxide Nanoribbons/Multi-Wall Carbon Nanotubes for Strontium Removal from Water

Oxidation functionalization of multiwalled carbon nanotube by mild acid sonication

Removal of Scale-Forming Ions and Oil Traces from Oil Field Produced Water Using Graphene Oxide/Polyethersulfone and TiO2 Nanoribbons/Polyethersulfone Nanofiltration Membranes

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