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Wedler C, Lotz K, Arami-Niya A, Xiao G, Span R, Muhler M, May EF, Richter M. Influence of Mineral Composition of Chars Derived by Hydrothermal Carbonization on Sorption Behavior of CO 2, CH 4, and O 2. ACS OMEGA 2020; 5:10704-10714. [PMID: 32455189 PMCID: PMC7240835 DOI: 10.1021/acsomega.9b04370] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 04/08/2020] [Indexed: 06/11/2023]
Abstract
The doping of SiO2 and Fe2O3 into hydrochars that were produced by the hydrothermal carbonization of cellulose was studied with respect to its impact on the resulting surface characteristics and sorption behavior of CO2, CH4, and O2. During pyrolysis, the structural order of the Fe-doped char changed, as the fraction of highly ordered domains increased, which was not observed for the undoped and Si-doped chars. The Si doping had no apparent influence on the oxidation temperature of the hydrochar in contrast to the Fe-doped char where the oxidation temperature was reduced because of the catalytic effect of Fe. Both dopants reduced the micro-, meso- and macroporous surface areas of the chars, although the Fe-doped chars had larger meso- and macroporosity than the Si-doped char. However, the increased degree in the structural order of the carbon matrix of the Fe-doped char reduced its microporosity relative to the Si-doped char. The adsorption of CO2 and CH4 on the chars at temperatures between 273.15 and 423.15 K and at pressures up to 115 kPa was slightly inhibited by the Si doping but strongly suppressed by the Fe doping. For O2, however, the Si doping promoted the observed adsorption capacity, while Fe doping also showed an inhibiting effect.
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Affiliation(s)
- Carsten Wedler
- Thermodynamics, Ruhr University Bochum, 44780 Bochum, Germany
| | - Katrin Lotz
- Laboratory
of Industrial Chemistry, Ruhr University
Bochum, 44780 Bochum, Germany
| | - Arash Arami-Niya
- Fluid
Science & Resources Division, Department of Chemical Engineering, The University of Western Australia, Perth, WA 6009, Australia
- Discipline
of Chemical Engineering, Western Australian School of Mines: Minerals,
Energy and Chemical Engineering, Curtin
University, Perth, WA 6845, Australia
| | - Gongkui Xiao
- Fluid
Science & Resources Division, Department of Chemical Engineering, The University of Western Australia, Perth, WA 6009, Australia
| | - Roland Span
- Thermodynamics, Ruhr University Bochum, 44780 Bochum, Germany
| | - Martin Muhler
- Laboratory
of Industrial Chemistry, Ruhr University
Bochum, 44780 Bochum, Germany
| | - Eric F. May
- Fluid
Science & Resources Division, Department of Chemical Engineering, The University of Western Australia, Perth, WA 6009, Australia
| | - Markus Richter
- Fluid
Science & Resources Division, Department of Chemical Engineering, The University of Western Australia, Perth, WA 6009, Australia
- Applied
Thermodynamics, Chemnitz University of Technology, 09126 Chemnitz, Germany
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Sapkota R, Zou J, Dawka S, Bobak JE, Papadopoulos C. Multi-functional thin film coatings formed via nanogrinding. APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0812-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Gao N, Yan Y, Chen X, Mee DJ. Nanoparticle-induced morphology and hydrophilicity of structured surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:12256-12265. [PMID: 22839729 DOI: 10.1021/la302627n] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Nanoparticles have been applied into the construction of micro- and nanoscaled surface structures with extreme wettability over the past few years. However, the details of processing and employing colloidal nanosuspensions for this purpose have not yet been fully investigated. In this work, we study the surface structures formed via nanosuspensions, in which nanoparticles of solid phase are presented, and the caused surface wettability. We disperse silica nanoparticles with different sizes into pure ethanol to prepare nanosuspensions with a series of concentrations. The suspensions are ultrasonically processed to prompt uniform distribution of nanoparticles before application. The deposited nanosuspensions are thermally treated to assist the regulation of surface patterns based on nanoparticles. Hence, the investigation explores a variety of experimental conditions that will lead to distinctive surface structures and wettabilities. Accordingly, the wettability of the induced surfaces is investigated using contact angle measurement, and the structures of those surfaces are mainly revealed by atomic force microscopy (AFM). Superhydrophilicity is observed on many of such formed surfaces, and the pattern of surface structures in micro- and nanoscale is closely related to the processing conditions and the size of nanoparticles. Thus, we report the characteristics of the surface patterns based on nanoparticles and the formed wettability.
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Affiliation(s)
- Nan Gao
- Energy and Sustainability Research Division, Faculty of Engineering, University of Nottingham, Nottingham, UK
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Gao N, Yan Y. Characterisation of surface wettability based on nanoparticles. NANOSCALE 2012; 4:2202-2218. [PMID: 22392411 DOI: 10.1039/c2nr11736c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Nanoparticles are becoming frequently used in the research area of creating functional surfaces because they can be more versatile than just making dimensions smaller. Particularly, a variety of nanoparticles have been applied for the construction of superhydrophobic and superhydrophilic surfaces with micro- and nano-scaled structures. As nanoparticles can also be fashioned and modified, their effects will be of great importance to the formed surface structures. In the present paper, we review the recent research progress in the utilization of nanoparticles to form extremely wettable/non-wettable surface structures and their influence on surface wettability. This report manifests an apparent inclination of nanoparticle structured surfaces using the multidisciplinary approaches, from the viewpoint of engineer/scientist. Therefore, the typical methodologies with regard to the use of nanoparticles, including the preparation and functionalisation processes, for the realization of surface wettabilities are discussed in this work. The discussions also represent some of the size-determined phenomena that are related to wettable/non-wettable surfaces. This Review thus provides an insight into the connection between nanoparticles and surface wettability.
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Affiliation(s)
- Nan Gao
- Energy and Sustainability Research Division, Faculty of Engineering, The University of Nottingham, Nottingham, UK
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The Mechanochemical Formation of Functionalized Semiconductor Nanoparticles for Biological, Electronic and Superhydrophobic Surface Applications. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/9781118144602.ch13] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
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