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Batista A, Bellettini IC, Brondani PB. Pain and nociception bioinspiration for the development of a micellar-based screening test for antinociceptive drugs. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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2
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Migliore N, Araya‐Hermosilla E, Scheutz GM, Sumerlin BS, Pucci A, Raffa P. Synthesis of poly(
1‐vinylimidazole
)‐
block
‐poly
(
9‐vinylcarbazole
) copolymers via
RAFT
and their use in chemically responsive graphitic composites. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20210736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nicola Migliore
- Department of Chemical Engineering ENTEG Institute, Faculty of Science and Engineering, University of Groningen Groningen The Netherlands
- George & Josephine Butler Polymer Research Laboratory, Department of Chemistry University of Florida Gainesville Florida USA
| | | | - Georg M. Scheutz
- George & Josephine Butler Polymer Research Laboratory, Department of Chemistry University of Florida Gainesville Florida USA
| | - Brent S. Sumerlin
- George & Josephine Butler Polymer Research Laboratory, Department of Chemistry University of Florida Gainesville Florida USA
| | - Andrea Pucci
- Department of Chemistry and Industrial Chemistry University of Pisa Pisa Italy
- CISUP, Centro per l'Integrazione della Strumentazione dell'Università di Pisa Pisa Italy
| | - Patrizio Raffa
- Department of Chemical Engineering ENTEG Institute, Faculty of Science and Engineering, University of Groningen Groningen The Netherlands
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3
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Qazi RA, Khattak R, Ali Shah L, Ullah R, Khan MS, Sadiq M, Hessien MM, El-Bahy ZM. Effect of MWCNTs Functionalization on Thermal, Electrical, and Ammonia-Sensing Properties of MWCNTs/PMMA and PHB/MWCNTs/PMMA Thin Films Nanocomposites. NANOMATERIALS 2021; 11:nano11102625. [PMID: 34685066 PMCID: PMC8539491 DOI: 10.3390/nano11102625] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Revised: 09/25/2021] [Accepted: 09/27/2021] [Indexed: 12/18/2022]
Abstract
Partially biodegradable polymer nanocomposites Poly(3-Hydroxybutyrate) (PHB)/MultiwalledCarbon Nanotubes (MWCNTs)/Poly(Methyl Methacrylate) (PMMA)and non-biodegradable nanocomposites (MWCNTs/PMMA) were synthesized, and their thermal, electrical, and ammonia-sensing properties were compared. MWCNTs were chemically modified to ensure effective dispersion in the polymeric matrix. Pristine MWCNTs (p-MWCNTs) were functionalized with –COOH (a-MWCNTs) and amine groups (f-MWCNTs). Then, PHB grafted multiwalled carbon nanotubes (g-MWNTs) were prepared by a ‘grafting to’ technique. The p-MWCNTs, a-MWCNTs, f-MWCNTs, and g-MWCNTs were incorporated into the PMMA matrix and PMMA/PHB blend system by solution mixing. The PHB/f-MWCNTs/PMMA blend system showed good thermal properties among all synthesized nanocomposites. Results from TGA and dTGA analysis for PHB/f-MWCNTs/PMMA showed delay in T5 (about 127 °C), T50 (up to 126 °C), and Tmax (up to 65 °C) as compared to neat PMMA. Higher values of frequency capacitance were observed in nanocomposites containing f-MWCNTs and g-MWCNTs as compared to nanocomposites containing p-MWCNTs and a-MWCNTs. This may be attributed to their excellent interaction and good dispersion in the polymeric blend. Analysis of ammonia gas-sensing data showed that PHB/g-MWCNTs/PMMA nanocomposites exhibited good sensitivity (≈100%) and excellent repeatability with a constant response. The calculated limit of detection (LOD) is 0.129 ppm for PHB/g-MWCNTs/PMMA, while that of all other nanocomposites is above 40 ppm.
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Affiliation(s)
- Raina Aman Qazi
- National Centre of Excellence in Physical Chemistry, Polymer Laboratory, University of Peshawar, Peshawar 25120, Pakistan; (L.A.S.); (R.U.)
- Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar 25000, Pakistan
- Correspondence: (R.A.Q.); (R.K.)
| | - Rozina Khattak
- Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar 25000, Pakistan
- Correspondence: (R.A.Q.); (R.K.)
| | - Luqman Ali Shah
- National Centre of Excellence in Physical Chemistry, Polymer Laboratory, University of Peshawar, Peshawar 25120, Pakistan; (L.A.S.); (R.U.)
| | - Rizwan Ullah
- National Centre of Excellence in Physical Chemistry, Polymer Laboratory, University of Peshawar, Peshawar 25120, Pakistan; (L.A.S.); (R.U.)
| | | | - Muhammad Sadiq
- Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan;
| | - Mahmoud M. Hessien
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia;
| | - Zeinhom M. El-Bahy
- Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt;
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4
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Fernando PUI, Alberts E, Glasscott MW, Netchaev A, Ray JD, Conley K, Patel R, Fury J, Henderson D, Moores LC, Kosgei GK. In Situ Preconcentration and Quantification of Cu 2+ via Chelating Polymer-Wrapped Multiwalled Carbon Nanotubes. ACS OMEGA 2021; 6:5158-5165. [PMID: 33681557 PMCID: PMC7931178 DOI: 10.1021/acsomega.0c04776] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 11/19/2020] [Indexed: 05/04/2023]
Abstract
Trace analysis of heavy metals in complex, environmentally relevant matrices remains a significant challenge for electrochemical sensors employing stripping voltammetry-based detection schemes. We present an alternative method capable of selectively preconcentrating Cu2+ ions at the electrode surface using chelating polymer-wrapped multiwalled carbon nanotubes (MWCNTs). An electrochemical sensor consisting of poly-4-vinyl pyridine (P4VP)-wrapped MWCNTs anchored to a poly(ethylene terephthalate) (PET)-modified gold electrode (r = 1.5 mm) was designed, produced, and evaluated. The P4VP is shown to form a strong association with Cu2+ ions, permitting preconcentration adjacent to the electrode surface for interrogation via cyclic voltammetry. The sensor exhibited a detection limit of 0.5 ppm with a linear range of 1.1-13.8 ppm (16.6-216 μM) and a relative standard deviation (RSD) of 4.9% at the Environmental Protection Agency (EPA) limit of 1.3 ppm. Evaluation in tap water, lake water, ocean water, and deionized water rendered similar results, highlighting the generalizability of the presented preconcentration strategy. The advantages of electrochemical analysis paired with polymeric chelation represent an effective platform for the design and deployment of heavy metal sensors for continuous monitoring of natural waters.
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Affiliation(s)
| | - Erik Alberts
- Simetri,
Inc., 7005 University
Boulevard, Winter Park, Florida 32792, United States
| | - Matthew W. Glasscott
- Oak
Ridge Institute for Science and Education, 1299 Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
- Department
of Chemistry, The University of North Carolina
at Chapel Hill, Chapel
Hill, North Carolina 27599, United States
| | - Anton Netchaev
- Information
Technology Laboratory, US Army Engineer
Research and Development Center, Vicksburg, Mississippi 39180, United States
| | - Jason D. Ray
- Information
Technology Laboratory, US Army Engineer
Research and Development Center, Vicksburg, Mississippi 39180, United States
| | - Keith Conley
- Information
Technology Laboratory, US Army Engineer
Research and Development Center, Vicksburg, Mississippi 39180, United States
| | - Rishi Patel
- Jordan Valley
Innovation Center, Missouri State University, 524 North Boonville Avenue, Springfield, Missouri 65806, United States
| | - Jonathan Fury
- Jordan
Valley Innovation Center, Brewer Science,
Inc., 524 North Boonville Avenue, Springfield, Missouri 65804, United States
| | - David Henderson
- Environmental
Laboratory, US Army Engineer Research and
Development Center, Vicksburg, Mississippi 39180, United States
| | - Lee C. Moores
- Environmental
Laboratory, US Army Engineer Research and
Development Center, Vicksburg, Mississippi 39180, United States
| | - Gilbert K. Kosgei
- Environmental
Laboratory, US Army Engineer Research and
Development Center, Vicksburg, Mississippi 39180, United States
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5
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Ranoo S, Lahiri BB, Nandy M, Philip J. Enhanced magnetic heating efficiency at acidic pH for magnetic nanoemulsions stabilized with a weak polyelectrolyte. J Colloid Interface Sci 2020; 579:582-597. [PMID: 32623124 DOI: 10.1016/j.jcis.2020.06.093] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/08/2020] [Accepted: 06/22/2020] [Indexed: 02/02/2023]
Abstract
HYPOTHESIS Magnetic fluid hyperthermia has attracted considerable attention for cancer therapeutics. Magnetic nanoemulsions are potential candidates for multi-modal hyperthermia due to the possibility of volumetric loading with suitable chemo/photo-therapy agents. Often, the nanocarriers are stabilized using organic molecules that behave differently under varying pH and hence, an understanding of their interfacial behaviour is important for practical applications. EXPERIMENTS We probe the magnetic heating efficiency of poly acrylic acid (PAA) stabilized oil-in-water magnetic nanoemulsions, as a function of pH, where the conformational changes of the PAA molecules are studied using dynamic light scattering and inter-droplet force measurements. FINDINGS A ~50% enhanced heating efficiency is observed when solution pH is reduced from ~9 to 3, which is attributed to the coil-to-globule conformational changes of the PAA molecules. The increased ionization of the carboxylic acid groups, at higher pH, leads to reduced hydrophobicity that results in an increase in the interfacial thermal resistance causing a lower magneto-thermal heating efficiency at higher pH. The proposed interfacial heat transfer hypothesis is experimentally verified using thermal imaging, where a lower rate of heat transfer is obtained at higher pH. The observed enhanced hyperthermia efficiency at low pH is beneficial for designing efficient pH-responsive nano-carriers for multi-modal hyperthermia.
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Affiliation(s)
- Surojit Ranoo
- Smart Materials Section, Corrosion Science and Technology Division, Materials Characterization Group, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, Tamil Nadu 603102, India
| | - B B Lahiri
- Smart Materials Section, Corrosion Science and Technology Division, Materials Characterization Group, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, Tamil Nadu 603102, India.
| | - Manali Nandy
- Smart Materials Section, Corrosion Science and Technology Division, Materials Characterization Group, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, Tamil Nadu 603102, India
| | - John Philip
- Smart Materials Section, Corrosion Science and Technology Division, Materials Characterization Group, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, Tamil Nadu 603102, India.
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6
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Abstract
In this work, we investigated the functionalization of reduced graphene oxide (rGO) with 2-(dodecen-1-yl) succinic anhydride (TPSA) to increase the rGO effective interactions with organic solvents both in liquid and vapor phases. Thermogravimetric analysis, STEM, XPS, FTIR-ATR, and Raman spectroscopy confirmed the effective functionalization of rGO with about the 30 wt% of grafted TPSA without affecting the structural characteristics of graphene but successfully enhancing its dispersibility in the selected solvent except for the apolar hexane. Solid TPSA-rGO dispersions displayed a reproducible semiconducting (activated) electrical transport with decreased resistance when heated from 20 °C to 60 °C and with a negative temperature coefficient of 10−3 K−1, i.e., comparable in absolute value with temperature coefficient in metals. It is worth noting that the same solid dispersions showed electrical resistance variation upon exposure to vapors with a detection limit in the order of 10 ppm and sensitivity α of about 10−4 ppm−1.
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