1
|
Pereira R, Lins RBE, Lima EFDS, Mainardi MDCAJ, Stamboroski S, Rischka K, Aguiar FHB. Properties of a Dental Adhesive Containing Graphene and DOPA-Modified Graphene. Polymers (Basel) 2024; 16:2081. [PMID: 39065398 PMCID: PMC11280573 DOI: 10.3390/polym16142081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Revised: 07/10/2024] [Accepted: 07/11/2024] [Indexed: 07/28/2024] Open
Abstract
Graphene is a promising biomaterial. However, its dispersion in aqueous medium is challenging. This study aimed to modify graphene nanoparticles with L-dopa to improve the properties of experimental dental adhesives. Adhesives were formulated with 0% (control), 0.25%, 0.5%, and 0.75% of graphene, modified or not. Particle modification and dispersion were microscopically assessed. Degree of conversion was tested by Fourier-transform infrared spectroscopy. Flexural strength and modulus of elasticity were evaluated by a 3-point flexural test. Bond strength was tested by shear. To test water sorption/solubility, samples were weighed during hydration and dehydration. Antibacterial activity was tested by Streptococcus mutans colony-forming units quantification. Cytotoxicity on fibroblasts was evaluated through a dentin barrier test. The modification of graphene improved the particle dispersion. Control presented the highest degree of conversion, flexural strength, and bond strength. In degree of conversion, 0.25% of groups were similar to control. In bond strength, groups of graphene modified by L-dopa were similar to Control. The modulus of elasticity was similar between groups. Cytotoxicity and water sorption/solubility decreased as particles increased. Compared to graphene, less graphene modified by L-dopa was needed to promote antibacterial activity. By modifying graphene with L-dopa, the properties of graphene and, therefore, the adhesives incorporated by it were enhanced.
Collapse
Affiliation(s)
- Renata Pereira
- Department of Restorative Dentistry, Division of Operative Dentistry, Piracicaba Dental School, University of Campinas (UNICAMP), Av. Limeira 901, Piracicaba 13414-903, SP, Brazil; (R.P.); (M.d.C.A.J.M.); (F.H.B.A.)
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Wiener Straße 12, 28359 Bremen, Germany;
| | | | - Elton Faria de Souza Lima
- Federal Institute of Education, Science and Technology of Goiás (IFG—Campus Uruaçu), Rua Formosa, Qd 28 e 29—Loteamento Santana, Uruaçu 76400-000, GO, Brazil;
| | - Maria do Carmo Aguiar Jordão Mainardi
- Department of Restorative Dentistry, Division of Operative Dentistry, Piracicaba Dental School, University of Campinas (UNICAMP), Av. Limeira 901, Piracicaba 13414-903, SP, Brazil; (R.P.); (M.d.C.A.J.M.); (F.H.B.A.)
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Wiener Straße 12, 28359 Bremen, Germany;
| | - Stephani Stamboroski
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Wiener Straße 12, 28359 Bremen, Germany;
| | - Klaus Rischka
- Department of Restorative Dentistry, Division of Operative Dentistry, Piracicaba Dental School, University of Campinas (UNICAMP), Av. Limeira 901, Piracicaba 13414-903, SP, Brazil; (R.P.); (M.d.C.A.J.M.); (F.H.B.A.)
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Wiener Straße 12, 28359 Bremen, Germany;
| | - Flávio Henrique Baggio Aguiar
- Department of Restorative Dentistry, Division of Operative Dentistry, Piracicaba Dental School, University of Campinas (UNICAMP), Av. Limeira 901, Piracicaba 13414-903, SP, Brazil; (R.P.); (M.d.C.A.J.M.); (F.H.B.A.)
| |
Collapse
|
2
|
Wang D, Pan Q, Yang J, Gong S, Liu X, Fu Y. Effects of Mixtures of Engineered Nanoparticles and Cocontaminants on Anaerobic Digestion. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:2598-2614. [PMID: 38291652 DOI: 10.1021/acs.est.3c09239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
The widespread application of nanotechnology inevitably leads to an increased release of engineered nanoparticles (ENPs) into the environment. Due to their specific physicochemical properties, ENPs may interact with other contaminants and exert combined effects on the microbial community and metabolism of anaerobic digestion (AD), an important process for organic waste reduction, stabilization, and bioenergy recovery. However, the complicated interactions between ENPs and other contaminants as well as their combined effects on AD are often overlooked. This review therefore focuses on the co-occurrence of ENPs and cocontaminants in the AD process. The key interactions between ENPs and cocontaminants and their combined influences on AD are summarized from the available literature, including the critical mechanisms and influencing factors. Some sulfides, coagulants, and chelating agents have a dramatic "detoxification" effect on the inhibition effect of ENPs on AD. However, some antibiotics and surfactants increase the inhibition of ENPs on AD. The reasons for these differences may be related to the interactive effects between ENPs and cocontaminants, changes of key enzyme activities, adenosine triphosphate (ATP) levels, reactive oxygen species (ROS) production, and microbial communities. New scientific opportunities for a better understanding of the coexistence in real world situations are converging on the scale of nanoparticles.
Collapse
Affiliation(s)
- Dongbo Wang
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, P.R. China
| | - Qinyi Pan
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, P.R. China
| | - Jingnan Yang
- Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, School of Water Resources and Environmental Engineering, Nanyang Normal University, Nanyang 473061, PR China
| | - Sheng Gong
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, P.R. China
| | - Xuran Liu
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, P.R. China
| | - Yukui Fu
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, P.R. China
| |
Collapse
|
3
|
Huo Y, Long Y, Yuan S, Toury B, Normand B, Fellah C, Roiban L, Benayoun S. Study of Molecular-Level Dispersion of Pristine Graphene in Aqueous Media via Polyvinyl Alcohol Coil Physisorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:16046-16054. [PMID: 36516301 DOI: 10.1021/acs.langmuir.2c02636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Graphene has been widely used as a nanofiller in advanced electronic devices and nanocomposite materials to achieve enhanced electronic, mechanical, and barrier properties. Adequate polymers play the role of the composite matrix and can assist in the liquid-phase exfoliation of pristine graphene without any heavy chemical modification and the detriment of the properties of graphene. This stabilization mechanism is generally attributed to the steric forces formed between the polymer-adsorbed adsorbent. However, the key influence of the polymer concentration on the maximum graphene content in the colloidal solutions is still unclear. In this study, three different molar weights of water-soluble polyvinyl alcohol (PVA) were used for graphene dispersion. The influence of the PVA concentration on the graphene dispersion was systematically studied. Based on Flory's theory, we first proposed a model to describe the polymer adsorption process in the graphene/PVA/water ternary system in the "dilute" regime and simulated the adsorption-free energy changes during this transformation. This model is in good agreement with the experimental results and explains the critical polymer concentration, Cc, allowing the optimization of the graphene/polymer ratio. This fundamental understanding of polymer physisorption on 2D materials provides a simple method for producing nanocomposites with controlled nanosheet/polymer ratios and structures, which are of great interest for energy devices and biomaterials.
Collapse
Affiliation(s)
- Ying Huo
- Laboratoire de Tribologie et Dynamique des Systèmes CNRS UMR 5513, Université de Lyon, École Centrale de Lyon, Lyon69130, France
- Laboratoire MATEIS CNRS UMR 5510, Université de Lyon, INSA-Lyon, Lyon69100, France
- Laboratoire des Multimatériaux et Interfaces CNRS UMR 5615, Université de Lyon, Université Lyon 1, Lyon69100, France
| | - Yun Long
- Laboratoire MATEIS CNRS UMR 5510, Université de Lyon, INSA-Lyon, Lyon69100, France
| | - Sheng Yuan
- Laboratoire MATEIS CNRS UMR 5510, Université de Lyon, INSA-Lyon, Lyon69100, France
| | - Bérangère Toury
- Laboratoire des Multimatériaux et Interfaces CNRS UMR 5615, Université de Lyon, Université Lyon 1, Lyon69100, France
| | - Bernard Normand
- Laboratoire MATEIS CNRS UMR 5510, Université de Lyon, INSA-Lyon, Lyon69100, France
| | - Clémentine Fellah
- Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement CNRS UMR 5276, Université de Lyon, Université Lyon 1, Lyon69100, France
| | - Lucian Roiban
- Laboratoire MATEIS CNRS UMR 5510, Université de Lyon, INSA-Lyon, Lyon69100, France
| | - Stéphane Benayoun
- Laboratoire de Tribologie et Dynamique des Systèmes CNRS UMR 5513, Université de Lyon, École Centrale de Lyon, Lyon69130, France
| |
Collapse
|
4
|
Fan W, Zhou J, Ding Y, Xiao Z. Fabrication and mechanism study of the nitrocellulose aqueous dispersions by solvent displacement method. J Appl Polym Sci 2022. [DOI: 10.1002/app.53290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wen‐Hao Fan
- School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
- Key Laboratory of Special Energy Materials Nanjing University of Science and Technology, Ministry of Education Nanjing China
| | - Jie Zhou
- School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
- Key Laboratory of Special Energy Materials Nanjing University of Science and Technology, Ministry of Education Nanjing China
| | - Ya‐Jun Ding
- School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
- Key Laboratory of Special Energy Materials Nanjing University of Science and Technology, Ministry of Education Nanjing China
| | - Zhong‐Liang Xiao
- School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
- Key Laboratory of Special Energy Materials Nanjing University of Science and Technology, Ministry of Education Nanjing China
| |
Collapse
|
5
|
Jafarpour M, Nüesch F, Heier J, Abdolhosseinzadeh S. Functional Ink Formulation for Printing and Coating of Graphene and Other 2D Materials: Challenges and Solutions. SMALL SCIENCE 2022. [DOI: 10.1002/smsc.202200040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Mohammad Jafarpour
- Laboratory for Functional Polymers Swiss Federal Laboratories for Materials Science and Technology (Empa) 8600 Dübendorf Switzerland
- Institute of Materials Science and Engineering Swiss Federal Institute of Technology Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Frank Nüesch
- Laboratory for Functional Polymers Swiss Federal Laboratories for Materials Science and Technology (Empa) 8600 Dübendorf Switzerland
- Institute of Materials Science and Engineering Swiss Federal Institute of Technology Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Jakob Heier
- Laboratory for Functional Polymers Swiss Federal Laboratories for Materials Science and Technology (Empa) 8600 Dübendorf Switzerland
| | - Sina Abdolhosseinzadeh
- Laboratory for Functional Polymers Swiss Federal Laboratories for Materials Science and Technology (Empa) 8600 Dübendorf Switzerland
| |
Collapse
|
6
|
Huo L, Guo J, Hu H, Zhang K, Zhou H, Liu P. Graphene Nanosheets as Lubricant Additives: Effects of Nature and Size on Lubricating Performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:9678-9685. [PMID: 35894785 DOI: 10.1021/acs.langmuir.2c01322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Graphene has been widely investigated as an additive in lubricating oils to enhance their tribological performance. Here, the effects of the nature and size of the graphene nanosheets on the tribological performance were investigated with the hydrogenated hydroxyl-terminated polybutadiene dioctoate (O-HHTPB-O) as a model base oil after alkylation of the graphene oxide (GO) of different sizes with 1-dodecylamine (DA) and reduction. The 1-dodecylamine-modified graphene oxide (DA-GO) showed better dispersibility in the O-HHTPB-O base oil and subsequently better tribological performance than the reduced one (DA-rGO) for both the larger graphene oxide nanosheets (GOL) and the smaller graphene oxide nanosheets (GOS). The DA-GOS exhibited better wear-reduction performance than the DA-GOL, owing to its smaller size and higher polarity. Although the DA-GOL could be ground during the friction, the friction and wear in the original period affected the complete period lubricating performance.
Collapse
Affiliation(s)
- Lixia Huo
- State Key Laboratory of Applied Organic Chemistry and Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- Key Laboratory of Science and Technology on Vacuum Technology and Physics, Lanzhou Institute of Physics, Lanzhou 730010, Gansu, China
| | - Jinshan Guo
- State Key Laboratory of Applied Organic Chemistry and Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Hanjun Hu
- Key Laboratory of Science and Technology on Vacuum Technology and Physics, Lanzhou Institute of Physics, Lanzhou 730010, Gansu, China
| | - Kaifeng Zhang
- Key Laboratory of Science and Technology on Vacuum Technology and Physics, Lanzhou Institute of Physics, Lanzhou 730010, Gansu, China
| | - Hui Zhou
- Key Laboratory of Science and Technology on Vacuum Technology and Physics, Lanzhou Institute of Physics, Lanzhou 730010, Gansu, China
| | - Peng Liu
- State Key Laboratory of Applied Organic Chemistry and Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| |
Collapse
|
7
|
Wright JP, Sigdel S, Corkill S, Covarrubias J, LeBan L, Nepal A, Li J, Divigalpitiya R, Bossmann SH, Sorensen CM. Synthesis of turbostratic nanoscale graphene via chamber detonation of oxygen/acetylene mixtures. NANO SELECT 2021. [DOI: 10.1002/nano.202100305] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Justin P. Wright
- Department of Physics Kansas State University Manhattan Kansas USA
| | - Shusil Sigdel
- Department of Physics Kansas State University Manhattan Kansas USA
| | - Stephen Corkill
- Department of Physics Kansas State University Manhattan Kansas USA
| | - Jose Covarrubias
- Department of Chemistry Kansas State University Manhattan Kansas USA
| | - Levon LeBan
- Department of Chemistry Kansas State University Manhattan Kansas USA
| | - Arjun Nepal
- Department of Physics Kansas State University Manhattan Kansas USA
| | - Jun Li
- Department of Chemistry Kansas State University Manhattan Kansas USA
| | | | | | | |
Collapse
|
8
|
Trusova EA, Klimenko IV, Afzal AM, Shchegolikhin AN, Jurina LV. Comparison of oxygen-free graphene sheets obtained in DMF and DMF-aqua media. NEW J CHEM 2021. [DOI: 10.1039/d1nj01015h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
In pure DMF, the graphene layering is mainly limited to 5 layers; in the aqua presence, partial association of the lightest graphene sheets with the highest surface energy occurs.
Collapse
Affiliation(s)
- Elena A. Trusova
- Institution of Russian Academy of Sciences
- A. A. Baikov Institute of Metallurgy and Materials Science of RAS
- Moscow 119334
- Russia
| | - Inna V. Klimenko
- Emanuel Institute of Biochemical Physics of Russian Academy of Sciences
- Moscow 119334
- Russia
| | - Asya M. Afzal
- Institution of Russian Academy of Sciences
- A. A. Baikov Institute of Metallurgy and Materials Science of RAS
- Moscow 119334
- Russia
| | | | - Lyubov V. Jurina
- Emanuel Institute of Biochemical Physics of Russian Academy of Sciences
- Moscow 119334
- Russia
| |
Collapse
|
9
|
Effect of residual electrolyte on dispersion stability of graphene in aqueous solution. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04835-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
10
|
Zhang Z, Liu X, Wu J, Ren X, Li J. Insight into the removal of graphene oxide by nanoscale zero-valent iron. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
11
|
Zhang D, Qiu J, Shi L, Liu Y, Pan B, Xing B. The mechanisms and environmental implications of engineered nanoparticles dispersion. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 722:137781. [PMID: 32199363 DOI: 10.1016/j.scitotenv.2020.137781] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/28/2020] [Accepted: 03/05/2020] [Indexed: 06/10/2023]
Abstract
Dispersion of engineered nanoparticles (ENPs) has drawn special research attentions because the environmental behavior, risks, and applications of ENPs are greatly dependent on their dispersing status. This review summarizes the latest research progress of dispersion mechanisms, environmental applications in contaminants adsorption, and toxicity of ENPs dispersed in liquid and in solid matrix (3D-ENPs). Dispersion mechanisms of ENPs, including steric hindrance, electrostatic repulsion and "micelle wrapping" are well understood in single dispersing agent, however, the prediction of ENPs dispersion in real environments is not straightforward because of the diversity of structures, components, and properties of natural organic molecule mixtures. The adsorption characteristics, depending on the exposed surface areas in liquid, are significantly different between dispersed and aggregated ENPs. Comparing with the aggregated ENPs, the toxicity of dispersed ENPs is generally enhanced due to the increased uptake, released metal ions, carried contaminants, and induced ROS. 3D-ENPs not only inherit the excellent adsorption performance of ENPs dispersed in liquid, but also are beneficial to the separation and recycle from aqueous solutions due to their 3D rigid structures. However, the adsorption mechanisms as affected by environmental conditions are still unclear. Additionally, the potential risks of 3D-ENPs should be paid more attentions, with an emphasis on free radicals and stability of 3D structure.
Collapse
Affiliation(s)
- Di Zhang
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China
| | - Junke Qiu
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China
| | - Lin Shi
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China
| | - Yang Liu
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China
| | - Bo Pan
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China.
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, United States.
| |
Collapse
|
12
|
Patil R, Marathe D, Roy SP, Ray D, Aswal VK, Jha PK, Bahadur P, Tiwari S. Colloidal stability of graphene oxide nanosheets in association with triblock copolymers: A neutron scattering analysis. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 109:110559. [PMID: 32228907 DOI: 10.1016/j.msec.2019.110559] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 11/29/2019] [Accepted: 12/14/2019] [Indexed: 02/06/2023]
Abstract
This study investigates stabilization of graphene oxide (GO) nanosheets in polyethylene oxide-polypropylene oxide (PEO-PPO) block copolymers (P103, P123 and F127). Changes in micellization of copolymers upon GO addition were monitored using dynamic light (DLS) and small angle neutron scattering (SANS). Structural developments at sheet surface were studied with two possibilities; (i) adsorption of PPO block over hydrophobic basal plane allowing the engagement of hydrophilic PEO with aqueous bulk, and (ii) adsorption of micelles mediated via carboxylated groups. Insignificant changes in micellar parameters for P123 and P127 were indicative of their inferior interaction with GO. On the other hand, P103 micelles exhibited high affinity for sheets, noticeable as emergence of mass fractals and more than two-fold enhancement in micelle number density. The latter allowed coverage of entire surface with P103 micelles. Existence of mass fractals was verified by extracting the form and structure factors from the fitted SANS data. Spectroscopic and thermogravimetric analyses illustrated non-covalent adsorption of copolymer aggregates. It was interesting to note that the dispersion remained stable against protein and electrolyte addition. A comprehensive understanding on colloidal stability can be valuable for drug delivery applications of GO sheets.
Collapse
Affiliation(s)
- Rahul Patil
- Uka Tarsadia University, Maliba Pharmacy College, Gopal-Vidyanagar Campus, Surat 394350, India
| | - Dipika Marathe
- Uka Tarsadia University, Maliba Pharmacy College, Gopal-Vidyanagar Campus, Surat 394350, India
| | - Samaresh P Roy
- Uka Tarsadia University, Maliba Pharmacy College, Gopal-Vidyanagar Campus, Surat 394350, India
| | - Debes Ray
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra, India
| | - Vinod K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra, India
| | - Prafulla K Jha
- Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 390002, India
| | - Pratap Bahadur
- Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, India
| | - Sanjay Tiwari
- Uka Tarsadia University, Maliba Pharmacy College, Gopal-Vidyanagar Campus, Surat 394350, India.
| |
Collapse
|
13
|
|
14
|
Kansara V, Patil R, Tripathi R, Jha PK, Bahadur P, Tiwari S. Functionalized graphene nanosheets with improved dispersion stability and superior paclitaxel loading capacity. Colloids Surf B Biointerfaces 2019; 173:421-428. [DOI: 10.1016/j.colsurfb.2018.10.016] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 09/20/2018] [Accepted: 10/08/2018] [Indexed: 01/19/2023]
|
15
|
Damasceno JPV, Zarbin AJ. Electrostatic stabilization of multi-walled carbon nanotubes dispersed in nonaqueous media. J Colloid Interface Sci 2018; 529:187-196. [DOI: 10.1016/j.jcis.2018.06.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 05/30/2018] [Accepted: 06/02/2018] [Indexed: 11/27/2022]
|
16
|
Sabri F, Berthomier K, Marion A, Fradette L, Tavares JR, Virgilio N. Sodium alginate-grafted submicrometer particles display enhanced reversible aggregation/disaggregation properties. Carbohydr Polym 2018; 194:61-68. [DOI: 10.1016/j.carbpol.2018.04.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Revised: 03/30/2018] [Accepted: 04/02/2018] [Indexed: 01/05/2023]
|
17
|
A study on amphiphilic fluorinated block copolymer in graphite exfoliation using supercritical CO 2 for stable graphene dispersion. J Colloid Interface Sci 2018; 510:162-171. [PMID: 28942166 DOI: 10.1016/j.jcis.2017.09.065] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 09/11/2017] [Accepted: 09/15/2017] [Indexed: 11/24/2022]
Abstract
In this study, poly(2,2,2-trifluoroethyl methacrylate)-block-poly(4-vinylpyridine) (PTFEMA-b-PVP) was synthesized by stepwise reversible addition-fragmentation chain transfer (RAFT) polymerization for the preparation of graphene by the exfoliation of graphite nanoplatelets (GPs) in supercritical CO2 (SCCO2). Two different block copolymers (low and high molecular weights) were prepared with the same block ratio and used at different concentrations in the SCCO2 process. The amount of PTFEMA-b-PVP adsorbed on the GPs and the electrical conductivity of the SCCO2-treated GP samples were evaluated using thermogravimetric analysis (TGA) and four-point probe method, respectively. All GP samples treated with SCCO2 were then dispersed in methanol and the dispersion stability was investigated using online turbidity measurements. The concentration and morphology of few-layer graphene stabilized with PTFEMA-b-PVP in the supernatant solution were investigated by gravimetry, scanning electron microscopy, and Raman spectroscopy. Destabilization study of the graphene dispersions revealed that the longer block copolymer exhibited better affinity for graphene, resulting in a higher yield of stable graphene with minimal defects.
Collapse
|
18
|
Liang C, Wang B, Chen J, Yong Q, Huang Y, Liao B. Dispersion of Multi-Walled Carbon Nanotubes by Polymers with Carbazole Pendants. J Phys Chem B 2017; 121:8408-8416. [DOI: 10.1021/acs.jpcb.7b05481] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Caizhen Liang
- Key
Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou
Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, P.R. China
- University of Chinese Academy of Sciences, Beijing 100039, P.R. China
| | - Bin Wang
- Key
Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou
Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, P.R. China
| | - Jianjun Chen
- Key
Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou
Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, P.R. China
- University of Chinese Academy of Sciences, Beijing 100039, P.R. China
| | - Qiwen Yong
- Key
Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou
Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, P.R. China
- University of Chinese Academy of Sciences, Beijing 100039, P.R. China
| | - Yuewen Huang
- Key
Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou
Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, P.R. China
| | - Bing Liao
- Guangdong Academy of Sciences, Guangzhou 510650, P.R. China
| |
Collapse
|
19
|
Booth SG, Chang SY, Uehara A, La Fontaine C, Cibin G, Schroeder SL, Dryfe RA. In situ XAFS Study of Palladium Electrodeposition at the Liquid/Liquid Interface. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.03.059] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
20
|
Chen AW, Fang B, Lee H, Briseno AL, Santore MM. Evidence for negative charge near large area supported graphene in water: A study of silica microsphere interactions. J Colloid Interface Sci 2017; 492:15-24. [DOI: 10.1016/j.jcis.2016.12.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 11/30/2016] [Accepted: 12/01/2016] [Indexed: 12/29/2022]
|
21
|
Lomax DJ, Kant P, Williams AT, Patten HV, Zou Y, Juel A, Dryfe RAW. Ultra-low voltage electrowetting using graphite surfaces. SOFT MATTER 2016; 12:8798-8804. [PMID: 27722442 DOI: 10.1039/c6sm01565d] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The control of wetting behaviour underpins a variety of important applications from lubrication to microdroplet manipulation. Electrowetting is a powerful method to achieve external wetting control, by exploiting the potential-dependence of the liquid contact angle with respect to a solid substrate. Addition of a dielectric film to the surface of the substrate, which insulates the electrode from the liquid thereby suppressing electrolysis, has led to technological advances such as variable focal-length liquid lenses, electronic paper and the actuation of droplets in lab-on-a-chip devices. The presence of the dielectric, however, necessitates the use of large bias voltages (frequently in the 10-100 V range). Here we describe a simple, dielectric-free approach to electrowetting using the basal plane of graphite as the conducting substrate: unprecedented changes in contact angle for ultra-low voltages are seen below the electrolysis threshold (50° with 1 V for a droplet in air, and 100° with 1.5 V for a droplet immersed in hexadecane), which are shown to be reproducible, stable over 100 s of cycles and free of hysteresis. Our results dispel conventional wisdom that reversible, hysteresis-free electrowetting can only be achieved on solid substrates with the use of a dielectric. This work paves the way for the development of a new generation of efficient electrowetting devices using advanced materials such as graphene and monolayer MoS2.
Collapse
Affiliation(s)
- Deborah J Lomax
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Pallav Kant
- MCND and School of Physics & Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Aled T Williams
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Hollie V Patten
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Yuqin Zou
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Anne Juel
- MCND and School of Physics & Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Robert A W Dryfe
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| |
Collapse
|
22
|
Srivastava PK, Yadav P, Ghosh S. Non-oxidative, controlled exfoliation of graphite in aqueous medium. NANOSCALE 2016; 8:15702-15711. [PMID: 27523721 DOI: 10.1039/c6nr04244a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a simple, non-oxidative and controlled method to synthesize graphene monolayers by exfoliation in water from different solid carbon sources, such as highly ordered pyrolytic graphite and low density graphite. Any water based method is highly desirable due to several attractive features, such as environmental friendliness, low cost and wide compatibility with other water based processes. We show that thin graphene layers can be exfoliated controllably and reproducibly by varying different parameters during exfoliation in aqueous medium. It has been possible to obtain high quality graphene monolayers with a yield of ∼2.45 wt%, which can be increased up to 16.6 wt% by recycling the sediments. Field effect transistors based on exfoliated graphene monolayers have shown n-type doping and a high carrier mobility of 4500 cm(2) V(-1) s(-1) at room temperature and ∼20 000 cm(2) V(-1) s(-1) at low temperature. Density functional calculations corroborate the infrared spectroscopic results and also indicate that the charge transfer preferentially occurs from water molecules to the graphene sheets resulting in n-type doping. We anticipate that exfoliation of high quality graphene layers in aqueous medium would open up a pathway for various graphene based electronic and biological applications.
Collapse
Affiliation(s)
- Pawan Kumar Srivastava
- Electronic Materials and Device Laboratory School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Premlata Yadav
- Electronic Materials and Device Laboratory School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Subhasis Ghosh
- Electronic Materials and Device Laboratory School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| |
Collapse
|