Porous Materials and Hierarchically Structured Composites

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Applications".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 3604

Special Issue Editor


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Guest Editor
Department of Chemistry and Biochemistry, the City College of New York,85 St Nicholas Terrace, New York, NY 10031, USA
Interests: polymer engineering; nanoscale hybrid materials; microfluidics; polymer composites; interfacial properties of polymer nanoparticles; hierarchical assemblies; SERS sensing materials; fluorescent labeling materials; polymer-metal nanocomposites

Special Issue Information

Dear Colleagues,

The importance of hierarchically structured composites is widespread in various technological applications, such as energy storage, catalysis, removal of pollutants, sensors, biomaterials, and smart soaps. Nature is plentiful in hierarchical structures. For instance, many biological tissues (wood and bone) are fiber composites with a hierarchical structure, and the extracellular matrix is a complex hierarchical network composed of fibrous proteins. Inspired by nature’s design, a wide range of various types of hierarchically structured composites can be engineered with better control over their functional properties for specific applications. Specifically, polymer-mediated hierarchical-structured composites are of particular importance because of polymers’ flexibility, stimuli responsiveness, mechanical strength, adaptability, interior space for carrying the materials, porosity, and softness. When polymeric materials of tailored properties can combine with other functional materials (such as metallic, semiconducting, and/or fluorescent), they create hybrid properties useful for advanced applications. A key challenge remains in achieving better control over synthetic architectures of hierarchically structured composites. Recently, accelerated research has been focused on the formation of controlled hierarchically structured composites.

 

Therefore, This Special Issue will present a collection of original research papers and state-of-the-art reviews that focus on hierarchically structured composites. Both types of hierarchically structured composites (natural and engineered) are of interest for this Special Issue. This Special Issue welcomes the submission of various levels (two, three, and more) of composites materials with connections to polymeric materials. (1) Various synthesis techniques for the construction of hierarchically structured composites are appreciated for the collection of this special issue. (2) The characterization techniques and measurement of specific properties of hierarchically structured composites are of interest for this Special Issue. (3) Submission of original papers and reviews on various applications of hierarchically structured composite materials are encouraged.

 

Dr. Nikunjkumar Visaveliya
Guest Editor

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. Polymers 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 2700 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.

Dr. Nikunjkumar Visaveliya
Guest Editor

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. Polymers 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 2700 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

  • Hierarchical Structures
  • Structured Composites
  • Porous Materials
  • Polymers
  • Functionally Graded Materials
  • Biomimetic Structured Materials
  • Tough, Stiff, and Strong Materials
  • Structure-Function Relationship
  • Natural and Engineered Composites
  • Mechanical Properties
  • Soft Materials
  • Cross-Linking
  • Process Technology
  • Nano and Microfabrication
  • Metal Nanostructures and Minerals

Published Papers (1 paper)

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Research

16 pages, 2900 KiB  
Article
Enhanced Low-Frequency Sound Absorption of a Porous Layer Mosaicked with Perforated Resonator
by Xin Li, Bilong Liu and Qianqian Wu
Polymers 2022, 14(2), 223; https://doi.org/10.3390/polym14020223 - 6 Jan 2022
Cited by 15 | Viewed by 2946
Abstract
A composite structure composed of a porous-material layer mosaicked with a perforated resonator is proposed to improve the low-frequency sound absorption of the porous layer. This structure is investigated in the form of a porous-material matrix (PM) and a perforated resonator (PR), and [...] Read more.
A composite structure composed of a porous-material layer mosaicked with a perforated resonator is proposed to improve the low-frequency sound absorption of the porous layer. This structure is investigated in the form of a porous-material matrix (PM) and a perforated resonator (PR), and the PR is a thin perforated plate filled with porous material in its back cavity. Theoretical and numerical models are established to predict the acoustic impedance and sound absorption coefficient of the proposed structure, and two samples made of polyurethane and melamine, respectively, are tested in an impedance tube. The predicted results are consistent with that of the measured. Compared with a single porous layer with the same thickness, the results show that the designed structure provides an additional sound absorption peak at low frequencies. The proposed structure is compact and has an effective absorption bandwidth of more than two octaves especially below the frequency corresponding to 1/4 wavelength. A comparison is also made between the sound absorption coefficients of the proposed structure and a classical micro-perforated plate (MPP), and the results reveal equivalent acoustic performance, suggesting that it can be used as an alternative to the MPP for low–mid frequency sound absorption. Moreover, the influences of the main parameters on the sound absorption coefficient of PPCS are also analyzed, such as the hole diameter, area ratio, flow resistance, and porous-material thickness in the PR. The mechanism of sound absorption is discussed through the surface acoustic impedance and the distributions of particle velocity and sound pressure at several specific frequencies. This work provides a new idea for the applications of the thin porous layer in low- and medium-frequency sound absorption. Full article
(This article belongs to the Special Issue Porous Materials and Hierarchically Structured Composites)
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