1
|
Matter F, Niederberger M. Optimization of Mass and Light Transport in Nanoparticle-Based Titania Aerogels. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:7995-8008. [PMID: 37840780 PMCID: PMC10568969 DOI: 10.1021/acs.chemmater.3c01218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 08/31/2023] [Indexed: 10/17/2023]
Abstract
Aerogels composed of preformed titania nanocrystals exhibit a large surface area, open porosity, and high crystallinity, making these materials appealing for applications in gas-phase photocatalysis. Recent studies on nanoparticle-based titania aerogels have mainly focused on optimizing their composition to improve photocatalytic performance. Little attention has been paid to modification at the microstructural level to control fundamental properties such as gas permeability and light transmittance, although these features are of fundamental importance, especially for photocatalysts of macroscopic size. In this study, we systematically control the porosity and transparency of titania gels and aerogels by adjusting the particle loading and nonsolvent fraction during the gelation step. Mass transport and light transport were assessed by gas permeability and light attenuation measurements, and the results were related to the microstructure determined by gas sorption analysis and scanning electron microscopy. Mass transport through the aerogel network was found to proceed primarily via Knudsen diffusion leading to relatively low permeabilities in the range of 10-5-10-6 m2/s, despite very high porosities of 96-99%. While permeability was found to depend mainly on particle loading, the optical properties are predominantly affected by the amount of nonsolvent during gelation, allowing independent tuning of mass and light transport.
Collapse
Affiliation(s)
- Fabian Matter
- Laboratory for Multifunctional
Materials, Department of Materials, ETH
Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| | - Markus Niederberger
- Laboratory for Multifunctional
Materials, Department of Materials, ETH
Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| |
Collapse
|
2
|
Andrew LJ, Gillman ER, Walters CM, Lizundia E, MacLachlan MJ. Multi-Responsive Supercapacitors from Chiral Nematic Cellulose Nanocrystal-Based Activated Carbon Aerogels. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2301947. [PMID: 37093171 DOI: 10.1002/smll.202301947] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/10/2023] [Indexed: 05/03/2023]
Abstract
The development of long-lived electrochemical energy storage systems based on renewable materials is integral for the transition toward a more sustainable society. Supercapacitors have garnered considerable interest given their impressive cycling performance, low cost, and safety. Here, the first example of a chiral nematic activated carbon aerogel is shown. Specifically, supercapacitor materials are developed based on cellulose, a non-toxic and biodegradable material. The chiral nematic structure of cellulose nanocrystals (CNCs) is harnessed to obtain free-standing hierarchically ordered activated carbon aerogels. To impart multifunctionality, iron- and cobalt-oxide nanoparticles are incorporated within the CNC matrix. The hierarchical structure remains intact even at nanoparticle concentrations of ≈70 wt%. The aerogels are highly porous, with specific surface areas up to 820 m2 g-1 . A maximum magnetization of 17.8 ± 0.1 emu g-1 with superparamagnetic behavior is obtained, providing a base for actuator applications. These materials are employed as symmetric supercapacitors; owing to the concomitant effect of the hierarchically arranged carbon skeleton and KOH activation, a maximum Cp of 294 F g-1 with a capacitance retention of 93% after 2500 cycles at 50 mV s-1 is achieved. The multifunctionality of the composite aerogels opens new possibilities for the use of biomass-derived materials in energy storage and sensing applications.
Collapse
Affiliation(s)
- Lucas J Andrew
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada
| | - Emma R Gillman
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada
| | - Christopher M Walters
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada
| | - Erlantz Lizundia
- Life Cycle Thinking Group, Department of Graphic Design and Engineering Projects, Faculty of Engineering in Bilbao, University of the Basque Country (UPV/EHU), Bilbao, 48013, Spain
- BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, Leioa, 48940, Spain
| | - Mark J MacLachlan
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, British Columbia, V6T 1Z4, Canada
- WPI Nano Life Science Institute, Kanazawa University, Kanazawa, 920-1192, Japan
- UBC BioProducts Institute, 2385 East Mall, Vancouver, British Columbia, V6T 1Z4, Canada
| |
Collapse
|
3
|
Medinger J, Song KS, Umubyeyi P, Coskun A, Lattuada M. Magnetically Guided Synthesis of Anisotropic Porous Carbons toward Efficient CO 2 Capture and Magnetic Separation of Oil. ACS APPLIED MATERIALS & INTERFACES 2023; 15:21394-21402. [PMID: 37079299 DOI: 10.1021/acsami.3c03424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Conventional synthetic strategies do not allow one to impart structural anisotropy into porous carbons, thus leading to limited control over their textural properties. While structural anisotropy alters the mechanical properties of materials, it also introduces an additional degree of directionality to increase the pore connectivity and thus the flux in the designed direction. Accordingly, in this work the structure of porous carbons prepared from resorcinol-formaldehyde gels has been rendered anisotropic by integrating superparamagnetic colloids to the sol-gel precursor solution and by applying a uniform magnetic field during the sol-gel transition, which enables the self-assembly of magnetic colloids into chainlike structures to template the growth of the gel phase. Notably, the anisotropic pore structure is maintained upon pyrolysis of the gel, leading to hierarchically porous carbon monoliths with tunable structure and porosities. With an advantage granted to anisotropic materials, these porous carbons showed higher porosity, a higher CO2 uptake capacity of 3.45 mmol g-1 at 273 K at 1.1 bar, and faster adsorption kinetics compared to the ones synthesized in the absence of magnetic field. Moreover, these materials were also used as magnetic sorbents with fast adsorption kinetics for efficient oil-spill cleanup and retrieved easily by using an external magnetic field.
Collapse
Affiliation(s)
- Joelle Medinger
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Kyung Seob Song
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Pacifique Umubyeyi
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Ali Coskun
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Marco Lattuada
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
| |
Collapse
|
4
|
Matter F, Niederberger M. The Importance of the Macroscopic Geometry in Gas-Phase Photocatalysis. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2105363. [PMID: 35243811 PMCID: PMC9069382 DOI: 10.1002/advs.202105363] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Indexed: 05/04/2023]
Abstract
Photocatalysis has the potential to make a major technological contribution to solving pressing environmental and energy problems. There are many strategies for improving photocatalysts, such as tuning the composition to optimize visible light absorption, charge separation, and surface chemistry, ensuring high crystallinity, and controlling particle size and shape to increase overall surface area and exploit the reactivity of individual crystal facets. These processes mainly affect the nanoscale and are therefore summarized as nanostructuring. In comparison, microstructuring is performed on a larger size scale and is mainly concerned with particle assembly and thin film preparation. Interestingly, most structuring efforts stop at this point, and there are very few examples of geometry optimization on a millimeter or even centimeter scale. However, the recent work on nanoparticle-based aerogel monoliths has shown that this size range also offers great potential for improving the photocatalytic performance of materials, especially when the macroscopic geometry of the monolith is matched to the design of the photoreactor. This review article is dedicated to this aspect and addresses some issues and open questions that arise when working with macroscopically large photocatalysts. Guidelines are provided that could help develop novel and efficient photocatalysts with a truly 3D architecture.
Collapse
Affiliation(s)
- Fabian Matter
- Laboratory for Multifunctional MaterialsDepartment of MaterialsETH ZurichVladimir‐Prelog‐Weg 5Zurich8093Switzerland
| | - Markus Niederberger
- Laboratory for Multifunctional MaterialsDepartment of MaterialsETH ZurichVladimir‐Prelog‐Weg 5Zurich8093Switzerland
| |
Collapse
|
5
|
Shah N, Rehan T, Li X, Tetik H, Yang G, Zhao K, Lin D. Magnetic aerogel: an advanced material of high importance. RSC Adv 2021; 11:7187-7204. [PMID: 35423256 PMCID: PMC8695117 DOI: 10.1039/d0ra10275j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 01/12/2021] [Indexed: 12/27/2022] Open
Abstract
Magnetic materials have brought innovations in the field of advanced materials. Their incorporation in aerogels has certainly broadened their application area. Magnetic aerogels can be used for various purposes from adsorbents to developing electromagnetic interference shielding and microwave absorbing materials, high-level diagnostic tools, therapeutic systems, and so on. Considering the final use and cost, these can be fabricated from a variety of materials using different approaches. To date, several studies have been published reporting the fabrication and uses of magnetic aerogels. However, to our knowledge, there is no review that specifically focuses only on magnetic aerogels, so we attempted to overview the main developments in this field and ended our study with the conclusion that magnetic aerogels are one of the emerging and futuristic advanced materials with the potential to offer multiple applications of high value.
Collapse
Affiliation(s)
- Nasrullah Shah
- Department of Industrial and Manufacturing Systems Engineering, Kansas State University Manhattan KS 66506 USA +1-765-2372200 +1-785-4911492
- Department of Chemistry, Abdul Wali Khan University Mardan Mardan KP 23200 Pakistan
| | - Touseef Rehan
- Department of Biochemistry, Quaid-i-Azam University Islamabad 24000 Pakistan
| | - Xuemue Li
- Department of Industrial and Manufacturing Systems Engineering, Kansas State University Manhattan KS 66506 USA +1-765-2372200 +1-785-4911492
- Key Laboratory of High Efficiency and Clean Mechanical Engineering, Shandong University Jinan 250061 China
| | - Halil Tetik
- Department of Industrial and Manufacturing Systems Engineering, Kansas State University Manhattan KS 66506 USA +1-765-2372200 +1-785-4911492
| | - Guang Yang
- Department of Industrial and Manufacturing Systems Engineering, Kansas State University Manhattan KS 66506 USA +1-765-2372200 +1-785-4911492
| | - Keren Zhao
- Department of Industrial and Manufacturing Systems Engineering, Kansas State University Manhattan KS 66506 USA +1-765-2372200 +1-785-4911492
| | - Dong Lin
- Department of Industrial and Manufacturing Systems Engineering, Kansas State University Manhattan KS 66506 USA +1-765-2372200 +1-785-4911492
| |
Collapse
|
6
|
Rusch P, Zámbó D, Bigall NC. Control over Structure and Properties in Nanocrystal Aerogels at the Nano-, Micro-, and Macroscale. Acc Chem Res 2020; 53:2414-2424. [PMID: 33030336 PMCID: PMC7581295 DOI: 10.1021/acs.accounts.0c00463] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
![]()
The assembly
of individual colloidal nanocrystals into macroscopic
solvogels and aerogels introduced a new exciting type of material
into the class of porous architectures. In these so-called nanocrystal
gels, the structure and properties can be controlled and fine-tuned
to the smallest details. Recently it was shown that by employing nanocrystal
building blocks for such gel materials, the interesting nanoscopic
properties can be conserved or even expanded to properties that are
available neither in the nanocrystals nor in their respective bulk
materials. In general, the production of these materials features
the wet-chemical synthesis of stable nanocrystal colloids followed
by their carefully controlled destabilization to facilitate arrangement
of the nanocrystals into highly porous, interconnected networks. By
isolation of the synthesis of the discrete building blocks from the
assembly process, the electronic structure, optical properties, and
structural morphology can be tailored by the myriad of procedures
developed in colloidal nanocrystal chemistry. Furthermore, knowledge
and control over the structure–property correlation in the
resulting gel structures opens up numerous new ways for extended and
advanced applications. Consequently, the amount of different materials
converted to nanocrystal-based gel structures is rising steadily.
Meanwhile the number of methods for assembly initiation is likewise
increasing, offering control over the overall network structure and
porosity as well as the individual nanocrystal building block connection.
The resulting networks can be dried by different methods to obtain
highly porous air-filled networks (aerogels) or applied in their wet
form (solvogels). By now a number of different applications profiting
from the unique advantages of nanocrystal-based gel materials have
been realized and exploited in the areas of photocatalysis, electrocatalysis,
and sensing. In this Account, we aim to summarize the efforts
undertaken in
the structuring of nanocrystal-based network materials on different
scales, fine-tuning of the individual building blocks on the nanoscale,
the network connections on the microscale, and the macroscale structure
and shape of the final construct. It is exemplarily demonstrated how
cation exchange reactions (at the nanoscale), postgelation modifications
on the nanocrystal networks (microscale), and the structuring of the
gels via printing techniques (macroscale) endow the resulting nanocrystal
gel networks with novel physicochemical, mechanical, and electrocatalytic
properties. The methods applied in the more traditional sol–gel
chemistry targeting micro- and macroscale structuring are also reviewed,
showing their future potential promoting the field of nanocrystal-based
aerogels and their applications.
Collapse
Affiliation(s)
- Pascal Rusch
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany
| | - Dániel Zámbó
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany
| | - Nadja C. Bigall
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering − Innovation Across Disciplines), 30167 Hannover, Germany
| |
Collapse
|
7
|
Janulevicius M, Klimkevičius V, Mikoliunaite L, Vengalis B, Vargalis R, Sakirzanovas S, Plausinaitiene V, Zilinskas A, Katelnikovas A. Ultralight Magnetic Nanofibrous GdPO 4 Aerogel. ACS OMEGA 2020; 5:14180-14185. [PMID: 32566886 PMCID: PMC7301591 DOI: 10.1021/acsomega.0c01980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 05/21/2020] [Indexed: 05/05/2023]
Abstract
Anisotropic aerogels are promising bulk materials with a porous 3D structure, best known for their large surface area, low density, and extremely low thermal conductivity. Herein, we report the synthesis and some properties of ultralight magnetic nanofibrous GdPO4 aerogels. Our proposed GdPO4 aerogel synthesis route is eco-friendly and does not require any harsh precursors or conditions. The most common route for magnetic aerogel preparation is the introduction of magnetic nanoparticles into the structure during the synthesis procedure. However, the nanofibrous GdPO4 aerogel reported in this work is magnetic by itself already and no additives are required. The hydrogel used for nanofibrous GdPO4 aerogel preparation was synthesized via a hydrothermal route. The hydrogel was freeze-dried and heat-treated to induce a phase transformation from the nonmagnetic trigonal to magnetic monoclinic phase. Density of the obtained magnetic nanofibrous monoclinic GdPO4 aerogel is only ca. 8 mg/cm3.
Collapse
Affiliation(s)
- Matas Janulevicius
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | - Vaidas Klimkevičius
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | - Lina Mikoliunaite
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
- Center
for Physical Sciences and Technology, Saulėtekio al. 3, 10223 Vilnius, Lithuania
| | - Bonifacas Vengalis
- Center
for Physical Sciences and Technology, Saulėtekio al. 3, 10223 Vilnius, Lithuania
| | - Rokas Vargalis
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | - Simas Sakirzanovas
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | | | - Albinas Zilinskas
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | - Arturas Katelnikovas
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| |
Collapse
|
8
|
Putz F, Ludescher L, Elsaesser MS, Paris O, Hüsing N. Hierarchically Organized and Anisotropic Porous Carbon Monoliths. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2020; 32:3944-3951. [PMID: 32421084 PMCID: PMC7222333 DOI: 10.1021/acs.chemmater.0c00302] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 04/17/2020] [Indexed: 05/19/2023]
Abstract
Anisotropy is a key factor regarding mechanical or transport properties and thus the functionality of porous materials. However, the ability to deliberately design the pore structure of hierarchically organized porous networks toward anisotropic features is limited. Here, we report two straightforward routes toward hierarchically structured porous carbon monoliths with an anisotropic alignment of the microstructure on the level of macro- and mesopores. One approach is based on nanocasting (NC) of carbon precursors into hierarchical and anisotropic silica hard templates. The second route, a direct synthesis approach based on soft templating (ST), makes use of the flexibility of hierarchically structured resorcinol-formaldehyde gels, which are compressed and simultaneously carbonized in the deformed state. We present structural data of both types of carbon monoliths obtained by electron microscopy, nitrogen adsorption analysis, and SAXS measurements. In addition, we demonstrate how the degree of anisotropy can easily be controlled via the ST route.
Collapse
Affiliation(s)
- Florian Putz
- Materials
Chemistry, Paris Lodron University Salzburg, Jakob-Haringer Str. 2a, Salzburg 5020, Austria
| | - Lukas Ludescher
- Institute
of Physics, Montanuniversitaet Leoben, Franz-Josef-Str. 18, Leoben 8700, Austria
| | - Michael S. Elsaesser
- Materials
Chemistry, Paris Lodron University Salzburg, Jakob-Haringer Str. 2a, Salzburg 5020, Austria
| | - Oskar Paris
- Institute
of Physics, Montanuniversitaet Leoben, Franz-Josef-Str. 18, Leoben 8700, Austria
| | - Nicola Hüsing
- Materials
Chemistry, Paris Lodron University Salzburg, Jakob-Haringer Str. 2a, Salzburg 5020, Austria
| |
Collapse
|
9
|
Jraba A, Anna Z, Elaloui E. Effects of Sr2+, Fe3+ and Al3+ doping on the properties of TiO2 prepared using the sol–gel method. CR CHIM 2019. [DOI: 10.1016/j.crci.2019.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
10
|
Villa I, Lauria A, Moretti F, Fasoli M, Dujardin C, Niederberger M, Vedda A. Radio-luminescence spectral features and fast emission in hafnium dioxide nanocrystals. Phys Chem Chem Phys 2018; 20:15907-15915. [PMID: 29850733 DOI: 10.1039/c8cp01230j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, we investigate the optical properties of hafnium dioxide nanocrystals, upon X-ray irradiation, looking for spectral evolution following thermal treatments in air up to 1000 °C that modify the crystal size as well as their point defect concentrations. Radio-luminescence measurements from 10 K up to room temperature reveal a rich and evolving picture of the optical features. A complete spectral analysis of the broad luminescence spectra reveals the presence of several emission components in the visible and UV regions. The lower energy components peaking at 2.1, 2.5, and 2.9 eV are characterized by a thermal quenching energy of 0.08 eV, while the corresponding value for the UV bands at 4.1 and 4.7 eV is close to 0.23 eV. We tentatively assign the components ranging from 2 to 3 eV to the presence of optically active defects of an intrinsic nature, together with the occurrence of titanium impurities; conversely, the bands at higher energies are likely to be of an excitonic nature. The comparison with previous photo-luminescence studies allows evidencing characteristic differences between the features of luminescence emissions caused by intra-centre excitation and those occurring under ionizing irradiation. Finally, scintillation measurements in the visible range reveal the existence of a fast decay in the nanosecond time scale for the smallest hafnia nanocrystals. This study offers a clear description of HfO2 luminescence characteristics upon excitation by X-rays and can lead to a better comprehension of the structure-property relationship at the nanoscale in metal oxides.
Collapse
Affiliation(s)
- I Villa
- Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy.
| | | | | | | | | | | | | |
Collapse
|
11
|
Xu YT, Dai Y, Nguyen TD, Hamad WY, MacLachlan MJ. Aerogel materials with periodic structures imprinted with cellulose nanocrystals. NANOSCALE 2018; 10:3805-3812. [PMID: 29412210 DOI: 10.1039/c7nr07719j] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Novel aerogel materials with periodic structures derived from chiral nematic liquid crystalline cellulose nanocrystals (CNCs) are reported. The liquid crystalline structure of phase-separated CNCs is locked by a simple solvent exchange method or silica condensation. Both cellulose and silica/cellulose aerogel materials were obtained after critical point drying, and subsequent calcination of the silica/cellulose composite afforded a silica aerogel with periodic order. Gas adsorption and electron microscopy studies revealed that these materials have high surface areas and a unique chiral nematic structure imparted from the helicoidal CNC template. This is a new, scalable approach to aerogel materials with highly anisotropic structures. The high porosity and periodic, chiral features of these new materials may make them suitable for applications that require anisotropic properties or as hard templates for the construction of other ordered aerogels.
Collapse
Affiliation(s)
- Yi-Tao Xu
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.
| | | | | | | | | |
Collapse
|
12
|
Ziegler C, Wolf A, Liu W, Herrmann AK, Gaponik N, Eychmüller A. Moderne Anorganische Aerogele. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611552] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Christoph Ziegler
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore 639798 Singapur
| | - André Wolf
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Wei Liu
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Anne-Kristin Herrmann
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Nikolai Gaponik
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Alexander Eychmüller
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| |
Collapse
|
13
|
Ziegler C, Wolf A, Liu W, Herrmann AK, Gaponik N, Eychmüller A. Modern Inorganic Aerogels. Angew Chem Int Ed Engl 2017; 56:13200-13221. [DOI: 10.1002/anie.201611552] [Citation(s) in RCA: 221] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Indexed: 12/17/2022]
Affiliation(s)
- Christoph Ziegler
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
- Present address: LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore 639798 Singapore
| | - André Wolf
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Wei Liu
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Anne-Kristin Herrmann
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Nikolai Gaponik
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Alexander Eychmüller
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| |
Collapse
|
14
|
Rechberger F, Niederberger M. Synthesis of aerogels: from molecular routes to 3-dimensional nanoparticle assembly. NANOSCALE HORIZONS 2017; 2:6-30. [PMID: 32260673 DOI: 10.1039/c6nh00077k] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Colloidal nanocrystals are extensively used as building blocks in nanoscience, and amazing results have been achieved in assembling them into ordered, close-packed structures. But in spite of great efforts, the size of these structures is typically restricted to a few micrometers, and it is very hard to extend them into the macroscopic world. In comparison, aerogels are macroscopic materials, highly porous, disordered, ultralight and with immense surface areas. With these distinctive characteristics, they are entirely contrary to common nanoparticle assemblies such as superlattices or nanocrystal solids, and therefore cover a different range of applications. While aerogels are traditionally synthesized by molecular routes based on aqueous sol-gel chemistry, in the last few years the gelation of nanoparticle dispersions became a viable alternative to improve the crystallinity and to widen the structural, morphological and compositional complexity of aerogels. In this Review, the different approaches to inorganic non-siliceous and non-carbon aerogels are addressed. We start our discussion with wet chemical routes involving molecular precursors, followed by processing methods using nanoparticles as building blocks. A unique feature of many of these routes is the fact that a macroscopic, often monolithic body is produced by pure self-assembly of nanosized colloids without the need for any templates.
Collapse
Affiliation(s)
- Felix Rechberger
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, CH-8093 Zurich, Switzerland.
| | | |
Collapse
|
15
|
Zeng G, Shi N, Hess M, Chen X, Cheng W, Fan T, Niederberger M. A general method of fabricating flexible spinel-type oxide/reduced graphene oxide nanocomposite aerogels as advanced anodes for lithium-ion batteries. ACS NANO 2015; 9:4227-4235. [PMID: 25783818 DOI: 10.1021/acsnano.5b00576] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
High-capacity anode materials for lithium ion batteries (LIBs), such as spinel-type metal oxides, generally suffer from poor Li(+) and e(-) conductivities. Their drastic crystal structure and volume changes, as a result of the conversion reaction mechanism with Li, severely impede the high-rate and cyclability performance toward their practical application. In this article, we present a general and facile approach to fabricate flexible spinel-type oxide/reduced graphene oxide (rGO) composite aerogels as binder-free anodes where the spinel nanoparticles (NPs) are integrated in an interconnected rGO network. Benefiting from the hierarchical porosity, conductive network and mechanical stability constructed by interpenetrated rGO layers, and from the pillar effect of NPs in between rGO sheets, the hybrid system synergistically enhances the intrinsic properties of each component, yet is robust and flexible. Consequently, the spinel/rGO composite aerogels demonstrate greatly enhanced rate capability and long-term stability without obvious capacity fading for 1000 cycles at high rates of up to 4.5 A g(-1) in the case of CoFe2O4. This electrode design can successfully be applied to several other spinel ferrites such as MnFe2O4, Fe3O4, NiFe2O4 or Co3O4, all of which lead to excellent electrochemical performances.
Collapse
Affiliation(s)
- Guobo Zeng
- †Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093, Zurich, Switzerland
| | - Nan Shi
- ‡State Key Laboratory of Metal Matrix Composites, Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Michael Hess
- §Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093, Zurich, Switzerland
| | - Xi Chen
- †Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093, Zurich, Switzerland
| | - Wei Cheng
- †Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093, Zurich, Switzerland
| | - Tongxiang Fan
- ‡State Key Laboratory of Metal Matrix Composites, Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Markus Niederberger
- †Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093, Zurich, Switzerland
| |
Collapse
|
16
|
Kharissova OV, Dias HVR, Kharisov BI. Magnetic adsorbents based on micro- and nano-structured materials. RSC Adv 2015. [DOI: 10.1039/c4ra11423j] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Micro- and nano-sized magnetic adsorbents based on elemental metals, iron oxides, and ferrites and supported by inorganic (carbon, graphene, silica, and zeolites) or organic (macromolecules, polysaccharides, and biomolecules) compounds are reviewed.
Collapse
Affiliation(s)
| | - H. V. Rasika Dias
- Department of Chemistry & Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | | |
Collapse
|
17
|
Mazrouei-Sebdani Z, Khoddami A, Hadadzadeh H, Zarrebini M. Synthesis and performance evaluation of the aerogel-filled PET nanofiber assemblies prepared by electro-spinning. RSC Adv 2015. [DOI: 10.1039/c4ra15297b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This paper focuses on the potential use of sodium silicate based aerogels, instead of small precursor molecules, as a filler in the PET nanofibers (PNFs).
Collapse
Affiliation(s)
- Z. Mazrouei-Sebdani
- Department of Textile Engineering
- Isfahan University of Technology
- Isfahan 84156-83111
- Iran
| | - A. Khoddami
- Department of Textile Engineering
- Isfahan University of Technology
- Isfahan 84156-83111
- Iran
| | - H. Hadadzadeh
- Department of Chemistry
- Isfahan University of Technology
- Isfahan 84156-83111
- Iran
| | - M. Zarrebini
- Department of Textile Engineering
- Isfahan University of Technology
- Isfahan 84156-83111
- Iran
| |
Collapse
|