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MOF Based Functional Nanomaterials for Photo/Electrocatalysis, Energy Storage and Gas Sensors Applications

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: closed (20 February 2023) | Viewed by 12177

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Special Issue Editors

Prof. Dr. Shahid Hussain

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Guest Editor

School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China
Interests: MOS-MOF-MXene nanomaterials; gas sensors; electrochemical supercapacitors; Li-S batteries
Special Issues, Collections and Topics in MDPI journals

Dr. Dereth Drake

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Guest Editor

Department of Physics, Astronomy, and Geosciences, Valdosta State University, Valdosta, GA, USA
Interests: molecular physics; computational physics; plasma physics; chemical engineering; advanced fermentation technology

Dr. Javed Muhammad Sufyan

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Guest Editor

School of Physical Science and Technology, Lanzhou University, Lanzhou, China
Interests: nanomaterials; electrochemical supercapacitors; LiS batteries; solar cells; batteries
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metal–organic frameworks (MOFs) are compounds of metal ions and organic molecules that form structured frameworks. These advanced materials can be compared with sponges with unique abilities—being able to take up, hold, and release molecules from their pores. Therefore, metal–organic frameworks (MOFs) are currently one of the fastest-growing classes of materials. With a highly ordered framework of pores, metal–organic frameworks exhibit the largest surface areas. This feature provides space for molecules to adsorb and chemical reactions to occur. However, this is not the only reason industries and academia are becoming more interested in metal–organic frameworks. The building blocks of the framework—metals and organic linkers—can be combined in almost infinite ways to create novel materials. Therefore, unique structural characteristics can be achieved by tuning basic materials according to their specified application. As a rule of thumb, MOFs outperform other materials by a factor of 10.

This Special Issue aims to provide essential knowledge on the design and synthesis of specific metal–organic framework (MOF) classes, as well as their properties and applications in a variety of fields. It is expected to shed light on recent research work on uniform structures, adjustable porosity, and several chemical functionalities attractive to industry (textile, food, sensors, gas storage). It is also expected to suggest possible solutions to challenging society problems, such as diseases and availability to pure air and water. Additionally, this Special Issue intends to offer access to excellent references for postgraduate students, researching areas such as materials chemistry, inorganic chemistry, biological science, and environmental science.

This Special Issue welcomes the submission of original research, review, mini review, and perspective articles on “Metal–Organic Frameworks”, including but not limited to:

Carbon-based MOFs;
MOFs for the remediation of environmental pollutants;
MOFs for biosensors;
MOFs as catalysts;
MOFs for energy storage;
MOFs for gas purification and separation;
MOFs for drug delivery and imaging;
MOFs as biomedical microrobots;
MOFs for nuclear waste remediation.

Prof. Dr. Shahid Hussain
Dr. Dereth Drake
Dr. Javed Muhammad Sufyan
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

metal–organic frameworks
MOF nanomaterials
MOF synthesis
MOF applications
organic–inorganic hybrid

Published Papers (4 papers)

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Research

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16 pages, 15738 KiB

Open AccessArticle

Synthesis and Characterization of Ti-Sn Alloy for Orthopedic Application

by Ambreen Azmat, Muhammad Tufail and Ali Dad Chandio

Materials 2021, 14(24), 7660; https://doi.org/10.3390/ma14247660 - 12 Dec 2021

Cited by 13 | Viewed by 2815

Abstract

Titanium (Ti)-based alloys (e.g., Ti6Al4V) are widely used in orthopedic implant applications owing to their excellent mechanical properties and biocompatibility. However, their corrosion resistance needs to be optimized. In addition, the presence of aluminum and vanadium cause alzheimer and cancer, respectively. Therefore, in this study, titanium-based alloys were developed via powder metallurgy route. In these alloys, the Al and V were replaced with tin (Sn) which was the main aim of this study. Four sets of samples were prepared by varying Sn contents, i.e., 5 to 20 wt. %. This was followed by characterization techniques including laser particle analyzer (LPA), X-ray diffractometer (XRD), scanning electron microscope (SEM), computerized potentiostate, vicker hardness tester, and nanoindenter. Results demonstrate the powder sizes between 50 and 55 µm exhibiting very good densification after sintering. The alloy contained alpha at all concentrations of Sn. However, as Sn content in the alloy exceeded from 10 wt. %, the formation of intermetallic compounds was significant. Thus, the presence of such intermetallic phases are attributed to enhanced elastic modulus. In particular, when Sn content was between 15 and 20 wt. % a drastic increase in elastic modulus was observed thereby surpassing the standard/reference alloy (Ti6Al4V). However, at 10 wt. % of Sn, the elastic modulus is more or less comparable to reference counterpart. Similarly, hardness was also increased in an ascending order upon Sn addition, i.e., 250 to 310 HV. Specifically, at 10 wt. % Sn, the hardness was observed to be 250 HV which is quite near to reference alloy, i.e., 210 HV. Moreover, tensile strength (TS) of the alloys were calculated using hardness values since it was very difficult to prepare the test coupons using powders. The TS values were in the range of 975 to 1524 MPa at all concentrations of Sn. In particular, the TS at 10 wt. % Sn is 1149 MPa which is comparable to reference counterpart (1168 MPa). The corrosion rate of Titanium-Sn alloys (as of this study) and reference alloy, i.e., Ti6Al4V were also compared. Incorporation of Sn reduced the corrosion rate at large than that of reference counterpart. In particular, the trend was in decreasing order as Sn content increased from 5 to 20 wt. %. The minimum corrosion rate of 3.65 × 10⁻⁹ mm/year was noticed at 20 wt. % than that of 0.03 mm/year of reference alloy. This shows the excellent corrosion resistance upon addition of Sn at all concentrations. Full article

(This article belongs to the Special Issue MOF Based Functional Nanomaterials for Photo/Electrocatalysis, Energy Storage and Gas Sensors Applications)

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14 pages, 3438 KiB

Open AccessArticle

MXene/Ag₂CrO₄ Nanocomposite as Supercapacitors Electrode

by Tahira Yaqoob, Malika Rani, Arshad Mahmood, Rubia Shafique, Safia Khan, Naveed Kausar Janjua, Aqeel Ahmad Shah, Awais Ahmad and Abdullah A. Al-Kahtani

Materials 2021, 14(20), 6008; https://doi.org/10.3390/ma14206008 - 12 Oct 2021

Cited by 14 | Viewed by 2526

Abstract

MXene/Ag₂CrO₄ nanocomposite was synthesized effectively by means of superficial low-cost co-precipitation technique in order to inspect its capacitive storage potential for supercapacitors. MXene was etched from MAX powder and Ag₂CrO₄ spinel was synthesized by an easy sol-gel scheme. X-Ray diffraction (XRD) revealed an addition in inter-planar spacing from 4.7 Å to 6.2 Å while Ag₂CrO₄ nanoparticles diffused in form of clusters over MXene layers that had been explored by scanning electron microscopy (SEM). Energy dispersive X-Ray (EDX) demonstrated the elemental analysis. Raman spectroscopy opens the gap between bonding structure of as-synthesized nanocomposite. From photoluminence (PL) spectra the energy band gap value 3.86 eV was estimated. Electrode properties were characterized by applying electrochemical observations such as cyclic voltammetry along with electrochemical impedance spectroscopy (EIS) for understanding redox mechanism and electron transfer rate constant K_app. Additionally, this novel work will be an assessment to analyze the capacitive behavior of electrode in different electrolytes such as in acidic of 0.1 M H₂SO₄ has specific capacitance C_sp = 525 F/g at 10 mVs⁻¹ and much low value in basic of 1 M KOH electrolyte. This paper reflects the novel synthesis and applications of MXene/Ag₂CrO₄ nanocomposite electrode fabrication in energy storage devices such as supercapacitors. Full article

(This article belongs to the Special Issue MOF Based Functional Nanomaterials for Photo/Electrocatalysis, Energy Storage and Gas Sensors Applications)

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11 pages, 3177 KiB

Open AccessArticle

The Effect of Ca Dopant on the Electrical and Dielectric Properties of BaTi₄O₉ Sintered Ceramics

by Asad Ali, Muhammad Hasnain Jameel, Sarir Uddin, Abid Zaman, Zafar Iqbal, Qeemat Gul, Fozia Sultana, Muhammad Mushtaq, Khaled Althubeiti and Rafi Ullah

Materials 2021, 14(18), 5375; https://doi.org/10.3390/ma14185375 - 17 Sep 2021

Cited by 22 | Viewed by 1753

Abstract

The current research examines the impact of Ca²⁺ substitution on the phase and electrical properties of (Ba_1−xCa_x)Ti₄O₉, (x = 0.0, 0.3, 0.6, and 0.9) sintered pellets synthesized by solid-state reaction method. The as-synthesized samples were analyzed using X-ray diffraction (XRD) and impedance spectroscopy. The emergence of orthorhombic phase fit into space group Pnmm was revealed by XRD, and the addition of Ca resulted in a considerable shift in grain size. Dielectric properties were determined using an impedance spectroscopy in a wide frequency range from 1MHz to 3 GHz. The dielectric properties i.e., dielectric constant (ε_r) and dielectric loss (

t a n σ

), were measured at 3 GHz frequency. The frequency-dependent parameters such as conductivity, dielectric constant, and dielectric loss indicated that the relaxation process is a Maxwell–Wagner type of interfacial polarization. The improved dielectric properties and low energy loss have made (Ba_1−xCa_x)Ti₄O₉ a prominent energy storage material. This study provides the possibility to improve its dielectric properties and reduce energy loss, making it an excellent energy storage material. Full article

(This article belongs to the Special Issue MOF Based Functional Nanomaterials for Photo/Electrocatalysis, Energy Storage and Gas Sensors Applications)

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Review

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27 pages, 8020 KiB

Open AccessReview

Dynamic Behavior of Sandwich Structures with Magnetorheological Elastomer: A Review

by Umer Sharif, Beibei Sun, Shahid Hussain, Dauda Sh. Ibrahim, Orelaja Oluseyi Adewale, Sumaira Ashraf and Farrukh Bashir

Materials 2021, 14(22), 7025; https://doi.org/10.3390/ma14227025 - 19 Nov 2021

Cited by 8 | Viewed by 3168

Abstract

Magnetorheological (MR) materials are classified as smart materials that can alter their rheological features once exposed to peripheral magnetic fields. MR materials have been a standard and one of the primary smart materials for the last few decades due to their outstanding vibration control performance in adaptive sandwich structures and systems. This paper reviews the vibration suppression investigations of flexible constructions using MR elastomers (MREs). In relations of field-dependent controllability, physical features such as stiffness and the damping of different geometrical structures integrated with the core layer of MREs are explored. The veracity of the knowledge is discussed in this article, whereby sandwich structures with different MR treatment configurations are analyzed for free and forced vibration, MRE sandwich structures are analyzed for stability under different working conditions, and the optimal positions of fully and partially treated MRE sandwich structures for improved vibration control are identified. MR materials′ field-dependent stiffness and damping characteristics are also discussed in this article. A few of the most noteworthy research articles over the last several years have been summarized. Full article

(This article belongs to the Special Issue MOF Based Functional Nanomaterials for Photo/Electrocatalysis, Energy Storage and Gas Sensors Applications)

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