* . *
  • About
  • Advertise
  • Privacy & Policy
  • Contact
Thursday, September 18, 2025
Earth-News
  • Home
  • Business
  • Entertainment
    REO to return for UI homecoming – The News-Gazette

    REO Gears Up to Ignite the Stage at UI Homecoming Celebration!

    Gen V Season 2: What is The Odessa Project? – yahoo.com

    Gen V Season 2: Unlocking the Secrets of The Odessa Project

    PENN Entertainment stock rating reiterated at Market Outperform by JMP – Investing.com

    PENN Entertainment Stock Rated a Market Outperformer by Experts

    Here’s how NJ’s once-vibrant nightclub scene was born and why it died – Bergen Record

    The Rise and Fall of New Jersey’s Once-Vibrant Nightclub Scene: What Happened?

    The Emmys are back: Viewership soars to highest numbers in 4 years – yahoo.com

    The Emmys Return with a Bang: Viewership Hits a 4-Year High

    From Spinal Tap II to Ed Sheeran : your complete entertainment guide to the week ahead – The Guardian

  • General
  • Health
  • News

    Cracking the Code: Why China’s Economic Challenges Aren’t Shaking Markets, Unlike America’s” – Bloomberg

    Trump’s Narrow Window to Spread the Truth About Harris

    Trump’s Narrow Window to Spread the Truth About Harris

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Trending Tags

    • Trump Inauguration
    • United Stated
    • White House
    • Market Stories
    • Election Results
  • Science
  • Sports
  • Technology
    Bucking the Odds: Why Technology Companies Should Embrace Software Patents Today – Crowell & Moring LLP

    Bucking the Odds: Why Technology Companies Should Embrace Software Patents Today – Crowell & Moring LLP

    City IT presented Best of North Carolina Technology Award – RaleighNC.gov

    City IT Honored with Best of North Carolina Technology Award

    LELO Releases 2025 Futurist Report: Intergenerational Views on Relationships, Sex, and Technology – PR Newswire

    Exploring the Future: How Different Generations View Relationships, Sex, and Technology in 2025

    Will New Big Technology Engagements Reshape Innodata’s Growth Path? – Yahoo Finance

    Could New Major Tech Partnerships Propel Innodata to Unprecedented Growth?

    Unlocking AI Success: How People, Process, and Technology Form the Ultimate Triangle

    Billion-dollar coffins? New technology could make oceans transparent and Aukus submarines vulnerable – The Guardian

    Billion-Dollar Coffins? How New Technology Could Make Oceans Transparent and Expose Submarines

    Trending Tags

    • Nintendo Switch
    • CES 2017
    • Playstation 4 Pro
    • Mark Zuckerberg
No Result
View All Result
  • Home
  • Business
  • Entertainment
    REO to return for UI homecoming – The News-Gazette

    REO Gears Up to Ignite the Stage at UI Homecoming Celebration!

    Gen V Season 2: What is The Odessa Project? – yahoo.com

    Gen V Season 2: Unlocking the Secrets of The Odessa Project

    PENN Entertainment stock rating reiterated at Market Outperform by JMP – Investing.com

    PENN Entertainment Stock Rated a Market Outperformer by Experts

    Here’s how NJ’s once-vibrant nightclub scene was born and why it died – Bergen Record

    The Rise and Fall of New Jersey’s Once-Vibrant Nightclub Scene: What Happened?

    The Emmys are back: Viewership soars to highest numbers in 4 years – yahoo.com

    The Emmys Return with a Bang: Viewership Hits a 4-Year High

    From Spinal Tap II to Ed Sheeran : your complete entertainment guide to the week ahead – The Guardian

  • General
  • Health
  • News

    Cracking the Code: Why China’s Economic Challenges Aren’t Shaking Markets, Unlike America’s” – Bloomberg

    Trump’s Narrow Window to Spread the Truth About Harris

    Trump’s Narrow Window to Spread the Truth About Harris

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Trending Tags

    • Trump Inauguration
    • United Stated
    • White House
    • Market Stories
    • Election Results
  • Science
  • Sports
  • Technology
    Bucking the Odds: Why Technology Companies Should Embrace Software Patents Today – Crowell & Moring LLP

    Bucking the Odds: Why Technology Companies Should Embrace Software Patents Today – Crowell & Moring LLP

    City IT presented Best of North Carolina Technology Award – RaleighNC.gov

    City IT Honored with Best of North Carolina Technology Award

    LELO Releases 2025 Futurist Report: Intergenerational Views on Relationships, Sex, and Technology – PR Newswire

    Exploring the Future: How Different Generations View Relationships, Sex, and Technology in 2025

    Will New Big Technology Engagements Reshape Innodata’s Growth Path? – Yahoo Finance

    Could New Major Tech Partnerships Propel Innodata to Unprecedented Growth?

    Unlocking AI Success: How People, Process, and Technology Form the Ultimate Triangle

    Billion-dollar coffins? New technology could make oceans transparent and Aukus submarines vulnerable – The Guardian

    Billion-Dollar Coffins? How New Technology Could Make Oceans Transparent and Expose Submarines

    Trending Tags

    • Nintendo Switch
    • CES 2017
    • Playstation 4 Pro
    • Mark Zuckerberg
No Result
View All Result
Earth-News
No Result
View All Result
Home Science

Researchers conduct comprehensive review on preparation of MOF-based flame retardants via coordination bond cleavage

February 21, 2024
in Science
Researchers conduct comprehensive review on preparation of MOF-based flame retardants via coordination bond cleavage
Share on FacebookShare on Twitter

Researchers conducted a first-ever comprehensive review on the preparation of MOF-based flame retardants through coordination bond cleavage

Recent advances in the preparation of MOFs-based flame retardants based on coordination bond cleavage and their flame retardant applications. Credit: Ye-Tang Pan, Beijing Institute of Technology, China.

Since the first report of metal-organic framework (MOF)-based flame retardants in 2017, this research area has exploded. However, improving the flame-retardant efficiency of MOFs and expanding their application areas remain critical challenges. The physicochemical properties of MOFs are closely dependent on their topology, pore characteristics, and chemical composition, which can be modulated by targeted design.

Relative to direct synthesis, post-synthesis strategies for MOFs, including ion exchange, ligand replacement, and acid/base etching have greatly increased their application scope and potential. Methods based on coordination bond cleavage of MOFs have proven to be very effective in modulating the structure and have attracted extensive research in the field of flame retardancy.

The team of Ye-Tang Pan at Beijing Institute of Technology (BIT) focuses on the design and preparation of MOF-based flame retardants and multifunctional flame retardant polymer nanocomposites. This work presents important progress of MOF-based flame retardants so far from three aspects: the development and challenges of MOF-based flame retardants, the design of efficient MOF-based flame retardants through coordination bond breaking, and the application of functionalized MOFs in flame retardant field.

The work is published in Industrial Chemistry & Materials.

MOFs applied alone do not confer high-limiting oxygen index (LOI) values and UL-94 vertical combustion ratings to polymer composites, due to the single flame-retardant element, low percentage of flame-retardant elements, flammability of ligands, and microporous-dominated pore structure that is difficult to fully utilize.

“In this review, we critically evaluate for the first time post-synthetic methods involving coordination bond cleavage in the flame-retardant field in order to tailor composites and structures with or without disrupting the reticulation chemistry of the parent matrix of MOFs,” said Ye-Tang Pan, a professor at Beijing Institute of Technology, China, “We conclude with a critical outlook on the applications, challenges, and future prospects of this emerging and evolving field.”

Template derivatization of MOFs is considered to be an effective strategy for the preparation of structurally functionalized materials; however, the typically generated metal-carbon compounds dramatically depend on uncontrollable heat treatments and are energy-consuming. Costly organic ligands are cracked into gases and spilled at high temperatures, accompanied by intrinsic structural contraction, leaving carbon structures with scarce functional components.

Therefore, the pseudomorphic cleavage of MOFs based on the ion/ligand exchange strategy is more facile, gentle and controllable, which is also increasingly investigated in many fields. MOFs possess inherent flame-retardant potentials, i.e., large specific surface area, well-defined pore structure, and tunable physicochemical properties, and the above strategies also provide feasible insights into the flame-retardant functionalization of MOFs.

Acid-base strength mismatch leads to the pH value far from 7 for the corresponding salt during hydrolysis. Alkaline imidazolate ligands in ZIFs are prone to protonation by the H+ released from the salt-contained aqueous solution, followed by the collapse of the frameworks.

The group pioneered correlational research as early as 2017 in which honeycomb-like aluminum hydroxide flakes were fabricated by using aluminum nitrate (aq.) to attack ZIF-8 aggregates. The removal of rhombic dodecahedra with the residual of the outer coated layer resulted in mesoporous Al(OH)3 that could be further loaded with phosphorous-based flame retardant to improve the fire safety of epoxy resin (EP), superior to the commercial counterparts.

A major reason that the flame retardancy of MOFs alone is not outstanding is that their structures contain a large number of flammable ligands. Flame-retardant functional substitution of pristine ligands by post-synthesis ligand exchange strategy provides a good idea to improve the flame-retardant performance of MOFs.

For ZIFs composed of basic ligands, acidic compounds are more likely to break their coordination bonds, which is caused by ionized H+ protonated ligands. The dissociation process of the coordination bonds of MOFs under alkaline conditions can be simplified as a ligand exchange process in which the coordination groups in solution are replaced by anions/molecules such as OH- and H2O. Thermodynamically, MOFs are more inclined to remain in the crystalline state if the coordination bond between the metal ion and the ligand (M-L) is stronger than that between OH- or other ligand anions.

Furthermore, inspired by the encapsulation strategy and the acid etching strategy, the group reported for the first time that the phenomenon of acid generation by condensation of specific compounds was utilized to achieve simultaneous etching of ZIF-67 during the encapsulation process, which is conducive to the improvement of the flame retardancy and synthesis efficiency for the prepared fillers.

As a porous material, MOFs can adsorb smoke particles and toxic gases generated during polymer combustion. However, MOFs as flame retardants often face the problem of insufficient char formation capacity. The loading of functional fillers is an effective strategy to solve this problem. The effective loading of guests can be realized by preparing carriers with hierarchical porous or hollow structures.

This research group constructed bird’s nest-like hierarchical porous nanocages with effective loading of triphenyl phosphate up to 35.8 wt%, and the prepared polyurea composites showed good durability in terms of flame retardant properties. In addition, designing MOFs with open nanostructures can improve their smoke particle trapping ability. Toxic gases and smoke particles are more easily captured by MOFs through physical and chemical adsorption.

The easy functionalization of MOFs also creates convenient conditions for grafting target molecules. The main methods include the substitution reaction between amino-functionalized MOFs and flame retardants containing phosphorus-chlorine bonds; the addition reaction between double-bond functionalized MOFs and flame retardants containing phosphorus-hydrogen bonds; and the salt formation reaction between amino-functionalized MOFs and flame retardants containing phosphate ester bonds.

Flame retardants derived from MOFs have outstanding flame retardant advantages, and improving the flame retardancy of MOFs through coordination bond cleavage as well as expanding their functional applications is one of the effective means.

“In this work, we systematically summarize and outline the direct or indirect breaking of coordination bonds based on conformational relationships and further functionalization to construct highly efficient MOFs flame retardants, as well as the future prospects and challenges faced. It is also hoped that this work will quickly guide researchers through the field and inspire their next studies,” said Professor Pan.

More information:
Kunpeng Song et al, Coordination bond cleavage of metal–organic frameworks and application to flame-retardant polymeric materials, Industrial Chemistry & Materials (2023). DOI: 10.1039/D3IM00110E

Provided by
Industrial Chemistry & Materials

Citation:
Researchers conduct comprehensive review on preparation of MOF-based flame retardants via coordination bond cleavage (2024, February 20)
retrieved 20 February 2024
from https://phys.org/news/2024-02-comprehensive-mof-based-flame-retardants.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : Phys.org – https://phys.org/news/2024-02-comprehensive-mof-based-flame-retardants.html

Tags: conductResearchersscience
Previous Post

Study finds anti-piracy messages backfire, especially for men

Next Post

Throwing lithography a curve: Research introduces mask wafer co-optimization method

Trump Designates Antifa ‘Terror Organisation’ Days After Charlie Kirk Murder – NDTV

Trump Designates Antifa ‘Terror Organisation’ Days After Charlie Kirk Murder – NDTV

September 18, 2025
Study: UIS contributes nearly $1 billion to the Illinois economy – NPR Illinois

Study: UIS contributes nearly $1 billion to the Illinois economy – NPR Illinois

September 18, 2025
REO to return for UI homecoming – The News-Gazette

REO Gears Up to Ignite the Stage at UI Homecoming Celebration!

September 18, 2025
WATCH: Former CDC doctor says U.S. is on track to see uptick in preventable diseases under Kennedy – PBS

WATCH: Former CDC Doctor Warns of Rising Preventable Diseases in the U.S

September 18, 2025
Local politicians, judges, officials face increased threats, new data shows – WDSU

Local politicians, judges, officials face increased threats, new data shows – WDSU

September 18, 2025
Washington State Honors Hanford Team for Protecting Native Habitat – Department of Energy (.gov)

Washington State Celebrates Hanford Team’s Success in Protecting Native Habitat

September 17, 2025
Kent State University unveils poetry inspired by science despite federal funding cut – Ideastream

Kent State University Unveils Science-Inspired Poetry Amid Federal Funding Cuts

September 17, 2025
Fired CDC director warns of backslide in US vaccine science under RFK Jr – Al Jazeera

Fired CDC director warns of backslide in US vaccine science under RFK Jr – Al Jazeera

September 17, 2025
Melting Pot Brings Back Its Most ‘Luxurious’ Fondue for a Limited Time – yahoo.com

Melting Pot Brings Back Its Most ‘Luxurious’ Fondue for a Limited Time – yahoo.com

September 17, 2025
Bucking the Odds: Why Technology Companies Should Embrace Software Patents Today – Crowell & Moring LLP

Bucking the Odds: Why Technology Companies Should Embrace Software Patents Today – Crowell & Moring LLP

September 17, 2025

Categories

Archives

September 2025
MTWTFSS
1234567
891011121314
15161718192021
22232425262728
2930 
« Aug    
Earth-News.info

The Earth News is an independent English-language daily published Website from all around the World News

Browse by Category

  • Business (20,132)
  • Ecology (824)
  • Economy (844)
  • Entertainment (21,723)
  • General (17,097)
  • Health (9,889)
  • Lifestyle (858)
  • News (22,149)
  • People (848)
  • Politics (854)
  • Science (16,055)
  • Sports (21,344)
  • Technology (15,826)
  • World (828)

Recent News

Trump Designates Antifa ‘Terror Organisation’ Days After Charlie Kirk Murder – NDTV

Trump Designates Antifa ‘Terror Organisation’ Days After Charlie Kirk Murder – NDTV

September 18, 2025
Study: UIS contributes nearly $1 billion to the Illinois economy – NPR Illinois

Study: UIS contributes nearly $1 billion to the Illinois economy – NPR Illinois

September 18, 2025
  • About
  • Advertise
  • Privacy & Policy
  • Contact

© 2023 earth-news.info

No Result
View All Result

© 2023 earth-news.info

No Result
View All Result

© 2023 earth-news.info

Go to mobile version