PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Synthetic breakthrough for controlling functional group assembly over chaotic mixing

Synthetic breakthrough for controlling functional group assembly over chaotic mixing
2021-05-26
(Press-News.org) The multifunctional porous solids with diverse functionalized linkers have been utilized as promising materials for various applications in energy, environmental and biomedical areas. Although their emerging properties are ascribed to varying pore types resulting from combinations of functional groups, the chemical environment of the pores remains an open question. A new synthetic platform where the population of pores can be identified and further controlled is of great interest in materials science.

A research team, led by Professor Wonyoung Choe and Professor Tae-Hyuk Kwon in Department of Chemistry at Ulsan National Institute of Science and Technology (UNIST), South Korea, has recently unveiled a new synthetic approach for controlling functional group assemblies in porous solids by using a cage-based framework, also known as metal-organic polyhedra (MOPs). Their findings are expected to have attracted attention as a useful synthetic strategy for catalysis, gas storage, and molecular separation.

MOPs are the three-dimensional assembly of discrete cages. While MOPs share compositional similarities (i.e., metal clusters and organic linkers) with their solid-state counterparts, metal-organic frameworks (MOFs), the discrete and soluble nature of MOPs provides a unique advantage. In their study, the research team developed two-step self-assembly where functionalized cages are mixed. The authors call the new synthetic strategy as 'mixed-cage', which is drastically different from the conventional mixing strategy, so-called 'mixed-linker'. While mixed-linker strategy results in a random distribution of functionalized organic linkers over the framework, mixed-cage strategy yields identical functional groups on each cage unit.

Moreover, the research team demonstrated distinct solvatochromic behavior between two multifunctional solids produced by mixed-linker and mixed-cage strategies. They investigated the color changes of fluorescence emissions depending on the solvent polarity. While mixed-linker sample showed pronounced color changes, mixed-cage sample was only slightly affected by the solvent types. The authors further uncovered the detailed photophysical properties using films. Attributed to radiative decay kinetics of mixed-cage sample, greater than that of mixed-linker sample, higher emission intensity was observed for mixed-cage sample.

"Structure determines function and solids are not the exceptions," said Professor Wonyoung Choe. "Yet, what is more interesting here is that we find a new way to control the assembly of packing, using metal-organic polyhedra." He adds, "Such advance can alter the way of controlling the molecule-based solids."

INFORMATION:

The findings of this research have been published in Matter on May 26, 2021. This study has been supported by the National Research Foundation (NRF) of Korea via the Mid-Career Researcher Program, Science Research Center (SRC), Technology Development Program to Solve Climate Changes, and Global Ph.D. Fellowship (GPF), as well as Korea Environment Industry & Technology Institute (KEITI) through Public Technology Program based on Environmental Policy Program, funded by Korea Ministry of Environment (MOE).

Journal Reference Dongsik Nam, Jiyeon Kim, Eunhye Hwang, Joohan Nam, Hyein Jeong, Tae-Hyuk Kwon, and Wonyoung Choe, "Multivariate Porous Platform Based on Metal-Organic Polyhedra with Controllable Functionality Assembly," Matter, (2021).


[Attachments] See images for this press release:
Synthetic breakthrough for controlling functional group assembly over chaotic mixing

ELSE PRESS RELEASES FROM THIS DATE:

AI with swarm intelligence

2021-05-26
Communities benefit from sharing knowledge and experience among their members. Following a similar principle - called "swarm learning" - an international research team has trained artificial intelligence algorithms to detect blood cancer, lung diseases and COVID-19 in data stored in a decentralized fashion. This approach has advantage over conventional methods since it inherently provides privacy preservation technologies, which facilitates cross-site analysis of scientific data. Swarm learning could thus significantly promote and accelerate collaboration and information exchange in research, especially in the field of medicine. Experts from the DZNE, the University of Bonn, the information technology company Hewlett Packard Enterprise (HPE) and other research institutions report on ...

Mobility data reveals universal law of visitation in cities

2021-05-26
New research published in Nature provides a powerful yet surprisingly simple way to determine the number of visitors to any location in a city. Scientists* from the Santa Fe Institute, MIT, and ETH Zürich have discovered and developed a scaling law that governs the number of visitors to any location based on how far they are traveling and how often they are visiting. The visitation law opens up unprecedented possibilities for accurately predicting flows between locations, which could ultimately have applications in everything from city planning to preventing the spread of the next major pandemic. "Imagine you are standing on a busy plaza, say in Boston, and you see people coming and going. This ...

Overdose-associated cardiac arrests during COVID-19 pandemic

2021-05-26
What The Study Did: This study included data from more than 11,000 emergency medical services (EMS) agencies in 49 states to describe racial/ethnic, social and geographic changes in EMS-observed overdose-associated cardiac arrests during the COVID-19 pandemic through 2020 in the United States. Authors: Joseph Friedman, M.P.H., of the University of California, Los Angeles, is the corresponding author. To access the embargoed study: Visit our For The Media website at this link https://media.jamanetwork.com/ (10.1001/jamapsychiatry.2021.0967) Editor's Note: The article includes funding/support disclosures. Please see the article for additional information, including other authors, author ...

Frequency, variety of persistent symptoms among patients with COVID-19

2021-05-26
What The Study Did: Researchers conducted a review of studies examining the frequency and variety of persistent symptoms after COVID-19 infection. Authors: Steven N. Goodman, M.D., M.H.S., Ph.D., of Stanford University in Stanford, California, is the corresponding author. To access the embargoed study: Visit our For The Media website at this link https://media.jamanetwork.com/ (doi:10.1001/jamanetworkopen.2021.11417) Editor's Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support. INFORMATION: Media ...

Study reveals a universal travel pattern across four continents

2021-05-26
What explains how often people travel to a particular place? Your intuition might suggest that distance is a key factor, but empirical evidence can help urban studies researchers answer the question more definitively. A new paper by an MIT team, drawing on global data, finds that people visit places more frequently when they have to travel shorter distances to get there. "What we have found is that there is a very clear inverse relationship between how far you go and how frequently you go there," says Paolo Santi, a research scientist at the Senseable City Lab at MIT and a co-author of the new paper. "You only seldom go to faraway places, and usually you tend to visit places close to you more often. It tells us how we organize our lives." By examining cellphone data ...

Accessibility, usability of state health department COVID-19 vaccine websites

2021-05-26
What The Study Did: Researchers analyzed each state's department of health website for accessibility and usability challenges. Findings suggest state health department COVID-19 vaccine website accessibility and usability challenges create frustration, may promote health disparities and contribute to overall ineffective and inequitable distribution. Authors: Raj M. Ratwani, Ph.D., of the Medstar Health National Center for Human Factors in Healthcare in Washington, D.C., is the corresponding author. To access the embargoed study: Visit our For The Media website at this link https://media.jamanetwork.com/ (doi:10.1001/jamanetworkopen.2021.14861) Editor's ...

Brain tumors caused by normal neuron activity in mice predisposed to such tumors

2021-05-26
Seeing, hearing, thinking, daydreaming -- doing anything at all, in fact -- activates neurons in the brain. But for people predisposed to developing brain tumors, the ordinary buzzing of their brains could be a problem. A study by researchers at Washington University School of Medicine in St. Louis and Stanford University School of Medicine shows that the normal day-to-day activity of neurons can drive the formation and growth of brain tumors. The researchers studied mice genetically prone to developing tumors of their optic nerves, the bundle of neurons that carries ...

Measuring opioid-related mortality in Canada during COVID-19 pandemic

2021-05-26
What The Study Did: Researchers quantified the added burden of fatal opioid overdoses occurring in Ontario, Canada, during the first six months of the COVID-19 pandemic. Authors: Tara Gomes, Ph.D., of the Keenan Research Centre of the Li Ka Shing Knowledge Institute, St. Michael's Hospital in Toronto, is the corresponding author. To access the embargoed study: Visit our For The Media website at this link https://media.jamanetwork.com/ (doi:10.1001/jamanetworkopen.2021.12865) Editor's Note: The article includes conflict of interest and funding support disclosures. ...

Reporting of race, sex, socioeconomic status in randomized clinical trials in medical journals

2021-05-26
What The Study Did: Researchers compared reporting practices for race, sex and socioeconomic status in randomized clinical trials published in general medical journals in 2015 with those published in 2019. Authors: Asad Siddiqui, M.D., of the Hospital for Sick Children in Toronto, is the corresponding author. To access the embargoed study: Visit our For The Media website at this link https://media.jamanetwork.com/ (doi:10.1001/jamanetworkopen.2021.11516) Editor's Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support. INFORMATION: Media advisory: The full study is linked to this news ...

Dinosaur-age fossils provide new insights into origin of flowering plants

Dinosaur-age fossils provide new insights into origin of flowering plants
2021-05-26
Flowering plants (angiosperms) dominate most terrestrial ecosystems, providing the bulk of human food. However, their origin has been a mystery since the earliest days of evolutionary thought. Angiosperm flowers are hugely diverse. The key to clarifying the origin of flowers and how angiosperms might be related to other kinds of plants is understanding the evolution of the parts of the flower, especially angiosperm seeds and the fruits in which the seeds develop. Fossil seed-bearing structures preserved in a newly discovered Early Cretaceous silicified peat in Inner Mongolia, China, provide a partial answer to the origin of flowering plants, according to a study led by Prof. SHI Gongle from the Nanjing ...

LAST 30 PRESS RELEASES:

Thirty-year mystery of dissonance in the “ringing” of black holes explained

Less intensive works best for agricultural soil

Arctic rivers project receives “national champion” designation from frontiers foundation

Computational biology paves the way for new ALS tests

Study offers new hope for babies born with opioid withdrawal syndrome

UT, Volkswagen Group of America celebrate research partnership

New Medicare program could dramatically improve affordability for cancer drugs – if patients enroll

Are ‘zombie’ skin cells harmful or helpful? The answer may be in their shapes

University of Cincinnati Cancer Center presents research at AACR 2025

Head and neck, breast, lung and survivorship studies headline Dana-Farber research at AACR Annual Meeting 2025

AACR: Researchers share promising results from MD Anderson clinical trials

New research explains why our waistlines expand in middle age

Advancements in muon detection: Taishan Antineutrino Observatory's innovative top veto tracker

Chips off the old block

Microvascular decompression combined with nerve combing for atypical trigeminal neuralgia

Cutting the complexity from digital carpentry

Lung immune cell type “quietly” controls inflammation in COVID-19

Fiscal impact of expanded Medicare coverage for GLP-1 receptor agonists to treat obesity

State and sociodemographic trends in US cigarette smoking with future projections

Young adults drive historic decline in smoking

NFCR congratulates Dr. Robert C. Bast, Jr. on receiving the AACR-Daniel D. Von Hoff Award for Outstanding Contributions to Education and Training in Cancer Research

Chimpanzee stem cells offer new insights into early embryonic development

This injected protein-like polymer helps tissues heal after a heart attack

FlexTech inaugural issue launches, pioneering interdisciplinary innovation in flexible technology

In Down syndrome mice, 40Hz light and sound improve cognition, neurogenesis, connectivity

Methyl eugenol: potential to inhibit oxidative stress, address related diseases, and its toxicological effects

A vascularized multilayer chip reveals shear stress-induced angiogenesis in diverse fluid conditions

AI helps unravel a cause of Alzheimer's disease and identify a therapeutic candidate

Coalition of Autism Scientists critiques US Department of Health and Human Services Autism Research Initiative

Structure dictates effectiveness, safety in nanomedicine

[Press-News.org] Synthetic breakthrough for controlling functional group assembly over chaotic mixing