1
|
Kavyani S, Amjad-Iranagh S, Zarif M. Effect of temperature, pH, and terminal groups on structural properties of carbon nanotube-dendrimer composites: A coarse-grained molecular dynamics simulation study. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119825] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
2
|
Kavyani S, Dadvar M, Modarress H, Amjad-Iranagh S. Molecular Perspective Mechanism for Drug Loading on Carbon Nanotube–Dendrimer: A Coarse-Grained Molecular Dynamics Study. J Phys Chem B 2018; 122:7956-7969. [DOI: 10.1021/acs.jpcb.8b04434] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sajjad Kavyani
- Department of Chemical Engineering, Amirkabir University of Technology, 158754413 Tehran, Iran
| | - Mitra Dadvar
- Department of Chemical Engineering, Amirkabir University of Technology, 158754413 Tehran, Iran
| | - Hamid Modarress
- Department of Chemical Engineering, Amirkabir University of Technology, 158754413 Tehran, Iran
| | - Sepideh Amjad-Iranagh
- Department of Chemical Engineering, Amirkabir University of Technology, 158754413 Tehran, Iran
| |
Collapse
|
3
|
Kavyani S, Dadvar M, Modarress H, Amjad-Iranagh S. A coarse grained molecular dynamics simulation study on the structural properties of carbon nanotube-dendrimer composites. SOFT MATTER 2018; 14:3151-3163. [PMID: 29632929 DOI: 10.1039/c8sm00253c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
By employing coarse grained (CG) molecular dynamics (MD) simulation, the effect of the size and hydrophilic/hydrophobic properties of the interior/exterior structures of the dendrimers in carbon nanotube (CNT)-dendrimer composites has been studied, to find a stable composite with high solubility in water and the capability to be used in drug delivery applications. For this purpose, composites consisting of core-shell dendrimer complexes including: [PPI{core}-PAMAM{shell}], [PAMAM{core}-polyethyleneglycol (PEG){shell}] and [PAMAM{core}-fattyacid (FTA){shell}] were constructed. A new CG model for the fatty acid (FTA) molecules as functionalized to the dendrimer was developed, which, unlike the previous models, could generate the structural conformations of the FTA properly. The obtained results indicated that the dendrimer complexes with short FTA chains can form stable composites with the CNT. Also, it was found that the pristine PAMAM and PPI-PAMAM with small PPI, and PAMAM-PEG dendrimers with short PEG chains, can distribute their chains into the water medium and interact with the CNT efficiently, to form a stable water-soluble CNT-dendrimer composite. The results demonstrated that the structural difference between the interior and exterior of a core-shell dendrimer complex can prevent the core and the interior layers of the dendrimer complex from interacting with the CNT. An overall analysis of the results manifested that the CNT-PAMAM:4-PEG:4 is the most stable composite, due to strong binding of the dendrimer with the CNT while also having high solubility in water, and its core retains its structure properly and unchanged, suitable for encapsulating drugs in the targeted delivery applications.
Collapse
Affiliation(s)
- Sajjad Kavyani
- Department of Chemical Engineering, Amirkabir University of Technology, Hafez Ave., P.O. Box 15875-4413, Tehran, Iran.
| | | | | | | |
Collapse
|
4
|
Gosika M, Maiti PK. pH and generation dependent morphologies of PAMAM dendrimers on a graphene substrate. SOFT MATTER 2018; 14:1925-1938. [PMID: 29473069 DOI: 10.1039/c8sm00179k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The adsorption of PAMAM dendrimers at solid/water interfaces has been extensively studied, and is mainly driven by electrostatic and van der Waals interactions between the substrate and the dendrimers. However, the pH dependence of the adsorption driven predominantly by the van der Waals interactions is poorly explored, although it is crucial for investigating the potentiality of these dendrimers in supercapacitors and surface patterning. Motivated by this aspect, we have studied the adsorption behavior of PAMAM dendrimers of generations 2 (G2) to 5 (G5) with pH and salt concentration variation, on a charge neutral graphene substrate, using fully atomistic molecular dynamics simulations. The instantaneous snapshots from our simulations illustrate that the dendrimers deform significantly from their bulk structures. Based on various structural property calculations, we classify the adsorbed dendrimer morphologies into five categories and map them to a phase diagram. Interestingly, the morphologies we report here have striking analogies with those reported in star-polymer adsorption studies. From the fractional contacts and other structural property analyses we find that the deformations are more pronounced at neutral pH as compared to high and low pH. Higher generation dendrimers resist deformation following the deformation trend, G2 > G3 > G4 > G5 at any given pH level. As the adsorption here is mainly driven by van der Waals interactions, we observe no desorption of the dendrimers as the salt molarity is increased, unlike that reported in the electrostatically driven adsorption studies.
Collapse
Affiliation(s)
- Mounika Gosika
- Center for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore - 560012, India.
| | | |
Collapse
|
5
|
Pramanik D, Maiti PK. DNA-Assisted Dispersion of Carbon Nanotubes and Comparison with Other Dispersing Agents. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35287-35296. [PMID: 28905626 DOI: 10.1021/acsami.7b06751] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Separation and sorting of pristine carbon nanotubes (CNTs) from bundle geometry is a very challenging task due to the insoluble and nondispersive nature of CNTs in aqueous medium. Recently, many studies have been performed to address this problem using various organic and inorganic solutions, surfactant molecules, and biomolecules as dispersing agents. Recent experimental studies have reported the DNA to be highly efficient in dispersing CNTs from bundle geometry. However, there is no microscopic study and also quantitative estimation of the dispersion efficiency of the DNA. Using all-atom molecular dynamics simulation, we study the structure and stability of single-stranded DNA (ssDNA)-single-walled carbon nanotube (SWNT) (6,5) complex. To quantify the dispersion efficiency of various DNA sequences, we perform potential of mean forces (PMF) calculation between two bare SWNTs as well ssDNA-wrapped CNTs for different base sequences. From the PMF calculation, we find the PMF between two bare (6,5) SWNTs to be approximately -29 kcal/mol. For the ssDNA-wrapped SWNTs, the PMF reduces significantly and becomes repulsive. In the presence of ssDNA of different polynucleotide bases (A, T, G, and C), we present a microscopic picture of the ssDNA-SWNT (6,5) complex and also a quantitative estimate of the interaction strength between nanotubes from PMF calculation. From PMF, we show the sequence of dispersion efficiency for four different nucleic bases to be T > A > C > G. We have also presented a comparison of the dispersion efficiencies of ssDNA, flavin mononucleotide surfactant, and poly(amidoamine) (PAMAM) dendrimer by comparing their respective PMF values.
Collapse
Affiliation(s)
- Debabrata Pramanik
- Department of Physics, Indian Institute of Science , Bangalore 560012, India
| | - Prabal K Maiti
- Department of Physics, Indian Institute of Science , Bangalore 560012, India
| |
Collapse
|
6
|
Pramanik D, Maiti PK. Dendrimer assisted dispersion of carbon nanotubes: a molecular dynamics study. SOFT MATTER 2016; 12:8512-8520. [PMID: 27714360 DOI: 10.1039/c6sm02015a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Various unique physical, chemical, mechanical and electronic properties of carbon nanotubes (CNTs) make them very useful materials for diverse potential application in many fields. Experimentally synthesized CNTs are generally found in bundle geometry with a mixture of different chiralities and present a unique challenge to separate them. In this paper we have proposed the PAMAM dendrimer to be an ideal candidate for this separation. To estimate the efficiency of the dendrimer for the dispersion of CNTs from the bundle geometry, we have calculated potential of mean forces (PMF). Our PMF study of two dendrimer-wrapped CNTs shows lesser binding affinity compared to the two bare CNTs. PMF study shows that the binding affinity decreases for non-protonated dendrimer, and for the protonated case the interaction is fully repulsive in nature. For both the non-protonated as well as protonated cases, the PMF increases gradually with increasing dendrimer generations from 2 to 4 compared to the bare PMF. We have performed PMF calculations with (6,5) and (6,6) chirality to study the chirality dependence of PMF. Our study shows that the PMFs between two (6,5) and two (6,6) CNTs respectively are ∼-29 kcal mol-1 and ∼-27 kcal mol-1. Calculated PMF for protonated dendrimer-wrapped chiral CNTs is more compared to the protonated dendrimer-wrapped armchair CNTs for all the generations studied. However, for non-protonated dendrimer-wrapped CNTs, such chirality dependence is not very prominent. Our study suggests that the dispersion efficiency of the protonated dendrimer is more compared to the non-protonated dendrimer and can be used as an effective dispersing agent for the dispersion of CNTs from the bundle geometry.
Collapse
Affiliation(s)
- Debabrata Pramanik
- Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India.
| | - Prabal K Maiti
- Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India.
| |
Collapse
|
7
|
Kanchi S, Suresh G, Priyakumar UD, Ayappa KG, Maiti PK. Molecular Dynamics Study of the Structure, Flexibility, and Hydrophilicity of PETIM Dendrimers: A Comparison with PAMAM Dendrimers. J Phys Chem B 2015; 119:12990-3001. [DOI: 10.1021/acs.jpcb.5b07124] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Subbarao Kanchi
- Center
for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore, 560012, India
- Department
of Chemical Engineering, Center for Biosystems Science and Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Gorle Suresh
- Center
for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Hyderabad, 500032, India
| | - U. Deva Priyakumar
- Center
for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Hyderabad, 500032, India
| | - K. G. Ayappa
- Department
of Chemical Engineering, Center for Biosystems Science and Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Prabal K Maiti
- Center
for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| |
Collapse
|
8
|
Zhou G, Yang Z, Fu F, Huang Y, Chen X, Lu Z, Hu N. Molecular-Level Understanding of Solvation Structures and Vibrational Spectra of an Ethylammonium Nitrate Ionic Liquid around Single-Walled Carbon Nanotubes. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b01624] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guobing Zhou
- College of Chemistry and Chemical Engineering,
Jiangxi Inorganic Membrane Materials Engineering Research Center, Jiangxi Normal University, Nanchang 330022, People’s Republic of China
| | - Zhen Yang
- College of Chemistry and Chemical Engineering,
Jiangxi Inorganic Membrane Materials Engineering Research Center, Jiangxi Normal University, Nanchang 330022, People’s Republic of China
| | - Fangjia Fu
- College of Chemistry and Chemical Engineering,
Jiangxi Inorganic Membrane Materials Engineering Research Center, Jiangxi Normal University, Nanchang 330022, People’s Republic of China
| | - Yiping Huang
- College of Chemistry and Chemical Engineering,
Jiangxi Inorganic Membrane Materials Engineering Research Center, Jiangxi Normal University, Nanchang 330022, People’s Republic of China
| | - Xiangshu Chen
- College of Chemistry and Chemical Engineering,
Jiangxi Inorganic Membrane Materials Engineering Research Center, Jiangxi Normal University, Nanchang 330022, People’s Republic of China
| | - Zhanghui Lu
- College of Chemistry and Chemical Engineering,
Jiangxi Inorganic Membrane Materials Engineering Research Center, Jiangxi Normal University, Nanchang 330022, People’s Republic of China
| | - Na Hu
- College of Chemistry and Chemical Engineering,
Jiangxi Inorganic Membrane Materials Engineering Research Center, Jiangxi Normal University, Nanchang 330022, People’s Republic of China
| |
Collapse
|
9
|
Mehra NK, Jain NK. Multifunctional hybrid-carbon nanotubes: new horizon in drug delivery and targeting. J Drug Target 2015; 24:294-308. [PMID: 26147085 DOI: 10.3109/1061186x.2015.1055571] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Carbon nanotubes (CNTs) have emerged as an intriguing nanotechnological tool for numerous biomedical applications including biocompatible modules for the bioactives delivery ascribed to their unique properties, such as greater loading efficiency, biocompatibility, non-immunogenicity, high surface area and photoluminescence, that make them ideal candidate in pharmaceutical and biomedical science. The design of multifunctional hybrid-CNTs for drug delivery and targeting may differ from the conventional drug delivery system. The conventional nanocarriers have few limitations, such as inappropriate availability of surface-chemical functional groups for conjugation, low entrapment/loading efficiency as well as stability as per ICH guidelines with generally regarded as safe (GRAS) prominences. The multifunctional hybrid-CNTs will sparked and open a new door for researchers, scientist of the pharmaceutical and biomedical arena. This review summarizes the vivid aspects of CNTs like characterization, supramolecular chemistry of CNTs-dendrimer, CNTs-nanoparticles, CNTs-quantum dots conjugate for delivery of bioactives, not discussed so far.
Collapse
Affiliation(s)
- Neelesh Kumar Mehra
- a Pharmaceutics Research Laboratory, Department of Pharmaceutical Sciences, Dr. Hari Singh Gour University , Sagar , India
| | - Narendra Kumar Jain
- a Pharmaceutics Research Laboratory, Department of Pharmaceutical Sciences, Dr. Hari Singh Gour University , Sagar , India
| |
Collapse
|
10
|
Bertels E, Bruyninckx K, Kurttepeli M, Smet M, Bals S, Goderis B. Highly efficient hyperbranched CNT surfactants: influence of molar mass and functionalization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:12200-12209. [PMID: 25245778 DOI: 10.1021/la503032g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
End-group-functionalized hyperbranched polymers were synthesized to act as a carbon nanotube (CNT) surfactant in aqueous solutions. Variation of the percentage of triphenylmethyl (trityl) functionalization and of the molar mass of the hyperbranched polyglycerol (PG) core resulted in the highest measured surfactant efficiency for a 5000 g/mol PG with 5.6% of the available hydroxyl end-groups replaced by trityl functions, as shown by UV-vis measurements. Semiempirical model calculations suggest an even higher efficiency for PG5000 with 2.5% functionalization and maximal molecule specific efficiency in general at low degrees of functionalization. Addition of trityl groups increases the surfactant-nanotube interactions in comparison to unfunctionalized PG because of π-π stacking interactions. However, at higher functionalization degrees mutual interactions between trityl groups come into play, decreasing the surfactant efficiency, while lack of water solubility becomes an issue at very high functionalization degrees. Low molar mass surfactants are less efficient compared to higher molar mass species most likely because the higher bulkiness of the latter allows for a better CNT separation and stabilization. The most efficient surfactant studied allowed dispersing 2.85 mg of CNT in 20 mL with as little as 1 mg of surfactant. These dispersions, remaining stable for at least 2 months, were mainly composed of individual CNTs as revealed by electron microscopy.
Collapse
Affiliation(s)
- Ellen Bertels
- Polymer Chemistry & Materials, KU Leuven , Celestijnenlaan 200F, b2404 Heverlee, Belgium
| | | | | | | | | | | |
Collapse
|
11
|
Bagul RS, Rajesh YB, Jayamurugan G, Bera A, Sood A, Jayaraman N. Photophysical behavior of poly(propyl ether imine) dendrimer in the presence of nitroaromatic compounds. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2012.12.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|