scholarly journals Three-dimensional graphene networks: synthesis, properties and applications

2014 ◽  
Vol 2 (1) ◽  
pp. 40-53 ◽  
Author(s):  
Yanfeng Ma ◽  
Yongsheng Chen
Keyword(s):  
Graphene Oxide ◽  
Three Dimensional ◽  
Porous Structures ◽  
Intrinsic Properties ◽  
Surface Areas ◽  
Synthesis Properties ◽  
Potential Applications ◽  
Specific Surface Areas ◽  
Graphene Foams ◽  
Mechanical Strengths

Abstract Recently, three-dimensional graphene/graphene oxide (GO) networks (3DGNs) in the form of foams, sponges and aerogels have attracted much attention. 3D structures provide graphene materials with high specific surface areas, large pore volumes, strong mechanical strengths and fast mass and electron transport, owing to the combination of the 3D porous structures and the excellent intrinsic properties of graphene. This review focuses on the latest advances in the preparation, properties and potential applications of 3D micro-/nano-architectures made of graphene/GO-based networks, with emphasis on graphene foams and sponges.

scholarly journals Improvement on Permeability of Cyclic Peptide/Peptidomimetic: Backbone N-Methylation as A Useful Tool

Marine Drugs ◽  
2021 ◽  
Vol 19 (6) ◽  
pp. 311
Author(s):  
Yang Li ◽  
Wang Li ◽  
Zhengshuang Xu
Keyword(s):  
Cyclic Peptides ◽  
Cyclic Peptide ◽  
Three Dimensional ◽  
Conformational Space ◽  
Cell Permeability ◽  
Relative Importance ◽  
Intrinsic Properties ◽  
Surface Areas ◽  
Synthetic Methodologies ◽  
Three Dimensional Configuration

Peptides have a three-dimensional configuration that can adopt particular conformations for binding to proteins, which are well suited to interact with larger contact surface areas on target proteins. However, low cell permeability is a major challenge in the development of peptide-related drugs. In recent years, backbone N-methylation has been a useful tool for manipulating the permeability of cyclic peptides/peptidomimetics. Backbone N-methylation permits the adjustment of molecule’s conformational space. Several pathways are involved in the drug absorption pathway; the relative importance of each N-methylation to total permeation is likely to differ with intrinsic properties of cyclic peptide/peptidomimetic. Recent studies on the permeability of cyclic peptides/peptidomimetics using the backbone N-methylation strategy and synthetic methodologies will be presented in this review.

scholarly journals Ultra-High Early Strength Cementitious Grout Suitable for Additive Manufacturing Applications Fabricated by Using Graphene Oxide and Viscosity Modifying Agents

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2900
Author(s):  
Alyaa Mohammed ◽  
Nihad Tareq Khshain Al-Saadi
Keyword(s):  
Graphene Oxide ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Design Method ◽  
Three Dimensional ◽  
Cementitious Materials ◽  
Fresh Properties ◽  
Manufacturing Applications ◽  
Mechanical Strengths ◽  
The Impact

One of the considerable challenges in the design of cementitious mixtures for additive manufacturing/three-dimensional (3D) printing applications is achieving both suitable fresh properties and significant mechanical strengths. This paper presents the use of graphene oxide (GO) as a promising nano reinforcement material with the potential to improve the printing feasibility and quality of a 3D printed cementitious matrix. Additionally, in this study, a viscosity modifying agent (VMA) was employed as a chemical additive to attain the required consistency and flow. The printed mixture was fabricated using various cementitious materials and waste materials. This study investigated the impact of GO and VMA on the enhancement of the 3D printing of cementitious composites through several tests. A flow test was conducted using the flow table test. The results showed a high fluidity and practical consistency, which are essential for nozzle pumping and accurateness in printed shapes. Furthermore, the bleeding test showed minimal bleeding up to hardening, and a considerable self-cleaning ability was noted during handling when conducting examinations of fresh properties. For hardened properties, the mechanical strengths were exceptionally high, especially at early ages, which is crucial for the stability of sequence layers of printed composites. The tensile strengths were 3.77, 10.5, 13.35, and 18.83 MPa at 1, 3, 7, and 28 days, respectively, and the compressive strengths were 25.1, 68.4, 85.6, and 125.4 MPa at 1, 3, 7, and 28 days, respectively. The test results showed the effectiveness of the fabricated cementitious mixture design method for meeting the requirements for 3D concrete printing applications.

scholarly journals Fabrication of Electrospun Polymer Nanofibers with Diverse Morphologies

Molecules ◽  
2019 ◽  
Vol 24 (5) ◽  
pp. 834 ◽  
Author(s):  
Chenyu Wang ◽  
Jun Wang ◽  
Liangdan Zeng ◽  
Ziwen Qiao ◽  
Xiaochen Liu ◽  
...  
Keyword(s):  
High Porosity ◽  
Polymer Nanofibers ◽  
Shell Side ◽  
Healthcare Applications ◽  
Simple Process ◽  
Surface Areas ◽  
Hollow Interior ◽  
Polymer Nanofiber ◽  
Potential Applications ◽  
Specific Surface Areas

Fiber structures with nanoscale diameters offer many fascinating features, such as excellent mechanical properties and high specific surface areas, making them attractive for many applications. Among a variety of technologies for preparing nanofibers, electrospinning is rapidly evolving into a simple process, which is capable of forming diverse morphologies due to its flexibility, functionality, and simplicity. In such review, more emphasis is put on the construction of polymer nanofiber structures and their potential applications. Other issues of electrospinning device, mechanism, and prospects, are also discussed. Specifically, by carefully regulating the operating condition, modifying needle device, optimizing properties of the polymer solutions, some unique structures of core–shell, side-by-side, multilayer, hollow interior, and high porosity can be obtained. Taken together, these well-organized polymer nanofibers can be of great interest in biomedicine, nutrition, bioengineering, pharmaceutics, and healthcare applications.

Facile fabrication of 3D ferrous ion crosslinked graphene oxide hydrogel membranes for excellent water purification

2019 ◽  
Vol 6 (10) ◽  
pp. 3060-3071 ◽  
Author(s):  
Zhangjingzhi Chen ◽  
Jun Wang ◽  
Xiaoguang Duan ◽  
Yuanyuan Chu ◽  
Xiaoyao Tan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Water Purification ◽  
High Surface ◽  
Ferrous Ion ◽  
Porous Structures ◽  
Water Pollutants ◽  
3D Graphene ◽  
Surface Areas ◽  
Hydrogel Membranes ◽  
Facile Fabrication

3D graphene-based macrostructures have been recognized as promising candidates for adsorption and separation of water pollutants due to their well-defined porous structures and high surface areas.

An atom-scale interfacial coordination strategy to prepare hierarchically porous Fe3O4–graphene frameworks and their application in charge and size selective dye removal

2015 ◽  
Vol 51 (76) ◽  
pp. 14405-14408 ◽  
Author(s):  
Yanmei Yang ◽  
Guowen Hu ◽  
Fengjuan Chen ◽  
Jian Liu ◽  
Weisheng Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Dye Removal ◽  
Synthesis Method ◽  
Three Dimensional ◽  
Porous Structures ◽  
Hierarchically Porous ◽  
Coordination Strategy

A novel atom-scale interfacial coordination assisted synthesis method for the textural engineering of three-dimensional (3D) Fe3O4–graphene oxide frameworks with hierarchical macro- and meso-porous structures is developed.

scholarly journals Functionalized Mesoporous Silica Membranes for CO2Separation Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Hyung-Ju Kim ◽  
Hee-Chul Yang ◽  
Dong-Yong Chung ◽  
In-Hwan Yang ◽  
Yun Jung Choi ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Molecular Sieves ◽  
Three Dimensional ◽  
Molecular Transport ◽  
Advanced Materials ◽  
Silica Membranes ◽  
Surface Areas ◽  
Functionalized Mesoporous Silica ◽  
Potential Applications ◽  
And Performance

Mesoporous silica molecular sieves are emerging candidates for a number of potential applications involving adsorption and molecular transport due to their large surface areas, high pore volumes, and tunable pore sizes. Recently, several research groups have investigated the potential of functionalized mesoporous silica molecular sieves as advanced materials in separation devices, such as membranes. In particular, mesoporous silica with a two- or three-dimensional pore structure is one of the most promising types of molecular sieve materials for gas separation membranes. However, several important challenges must first be addressed regarding the successful fabrication of mesoporous silica membranes. First, a novel, high throughput process for the fabrication of continuous and defect-free mesoporous silica membranes is required. Second, functionalization of mesopores on membranes is desirable in order to impart selective properties. Finally, the separation characteristics and performance of functionalized mesoporous silica membranes must be further investigated. Herein, the synthesis, characterization, and applications of mesoporous silica membranes and functionalized mesoporous silica membranes are reviewed with a focus on CO2separation.

Synthesis of Polyacetylene-like Modified Graphene Oxide Aerogel and Its Enhanced Electrical Properties

2019 ◽  
Author(s):  
Enrico Greco ◽  
Jing Shang ◽  
jiali zhu ◽  
Tong Zhu
Keyword(s):  
Graphene Oxide ◽  
Three Dimensional ◽  
Single Layer ◽  
Internal Surface ◽  
Solid Material ◽  
Single Layer Graphene ◽  
Covalent Bonds ◽  
Surface Areas ◽  
Modified Graphene Oxide ◽  
The Individual

<p>A graphene-based or carbon-based aerogel is a three-dimensional (3D) solid material in which the carbon atoms are arranged in a sheet-like nanostructure. In this study, we report the synthesis of low-density polymer-modified aerogel monoliths by 3D macro-assemblies of graphene oxide sheets that exhibit significant internal surface areas (982 m<sup>2</sup>/g) and high electrical conductivity (∼0.1 to 1 × 10<sup>2</sup> S/cm). Different types of materials were prepared to obtain a single monolithic solid starting from a suspension of single-layer graphene oxide (GO) sheets, and a polymer, made from the precursors 4-carboxybenzaldehyde and polyvinyl alcohol. These materials were used to cross-link the individual sheets by covalent bonds, resulting in wet-gels that were supercritically dried and then, in some cases, thermally reduced to yield graphene aerogel composites. The average densities were approaching 15-20 mg/cm<sup>3</sup>. This approach allowed for the modulation of distance between the sheets, pore dimension, surface area, and related properties. This specific GO/Polymer ratio has suitable malleability making it a viable candidate for use in conductivity 3D printing; it also has other properties suitable for energy storage, catalysis, sensing and biosensing applications, bioelectronics, and superconductors.</p>

Facile synthesis of porous organic polymers for the absorption of Pd(ii) ions and organic dyes

RSC Advances ◽  
2016 ◽  
Vol 6 (83) ◽  
pp. 79781-79791 ◽  
Author(s):  
Yanmei Luo ◽  
Junhui Ran ◽  
Rong Chen ◽  
Xinjian Cheng
Keyword(s):  
Reaction Time ◽  
Specific Surface ◽  
Pore Diameter ◽  
Organic Dyes ◽  
Porous Structures ◽  
High Adsorption ◽  
Facile Synthesis ◽  
Surface Areas ◽  
Adsorption Capacities ◽  
Specific Surface Areas

Two kinds of POPs were synthesized with unique porous structures, considerable specific surface areas and high adsorption capacities. The specific surface area and pore diameter could be adjusted via changing the reaction time and temperature.

A strategy for the synthesis of VN@C and VC@C core–shell composites with hierarchically porous structures and large specific surface areas for high performance symmetric supercapacitors

2018 ◽  
Vol 47 (24) ◽  
pp. 8052-8062 ◽  
Author(s):  
Yifu Zhang ◽  
Jiqi Zheng ◽  
Xuyang Jing ◽  
Changgong Meng
Keyword(s):  
Thermal Treatment ◽  
Electrochemical Performance ◽  
Specific Surface ◽  
High Performance ◽  
Core Shell ◽  
Porous Structures ◽  
Hierarchically Porous ◽  
Surface Areas ◽  
Specific Surface Areas ◽  
Novel Strategy

A novel strategy for the fabrication of VN@C and VC@C was developed by the thermal treatment with H2V3O8@C under N2 and Ar atmospheres. VN@C SSC device exhibited better electrochemical performance than VC@C SSC device.

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