74,353 results match your criteria temperatures polymers


Multifunctional Two-Dimensional Metal-Organic Frameworks for Radionuclide Sequestration and Detection.

ACS Appl Mater Interfaces 2021 Sep 20. Epub 2021 Sep 20.

Pacific Northwest National Laboratory, Richland, Washington 99352, United States.

Two lanthanide-containing porous coordination polymers, [Ln(bpdc)(phen)]·HO () and [Ln(bpdc)(terpy)]·3HO () (Ln = Pr, Nd, or Sm-Dy; bpdc: 2,2'-bipyridine-5,5'-dicarboxylic acid; phen: 1,10-phenanthroline; and terpy: 2,2':6',2″-terpyridine), have been hydrothermally synthesized and structurally characterized by powder and single-crystal X-ray diffraction. Crystallographic analyses reveal that compounds and feature Ln-containing dimeric nodes that form a porous two-dimensional (2D) and nonporous three-dimensional (3D) framework, respectively. Each material is stable in aqueous media between pH 3 and 10 and exhibits modest thermal stability up to ∼400 °C. Read More

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September 2021

Glass transition of ion-containing polymer melts in bulk and thin films.

Soft Matter 2021 Sep 20. Epub 2021 Sep 20.

Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.

Ion-containing polymers often are good glass formers, and the glass transition temperature is an important parameter to consider for practical applications, which prescribes the working temperature range for different mechanical and dynamic properties. In this work, we present a systematic molecular dynamics simulation study on the coupling of ionic correlations with the glass transition, based on a generic coarse-grained model of ionic polymers. The variation of the glass transition temperature is examined concerning the influence of the electrostatic interaction strength, charge fraction, and charge sequence. Read More

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September 2021

Stimuli-Driven Insulator-Conductor Transition in a Flexible Polymer Composite Enabled by Biphasic Liquid Metal.

Adv Mater 2021 Sep 19:e2104634. Epub 2021 Sep 19.

Institute of Advanced Materials, School of Chemistry and Chemical Engineering, and Jiangsu Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China.

Metal-polymer composites (MPCs) with combined properties of metals and polymers have achieved much industrial success. However, metals in MPCs are thought to be ordinary and invariable electrically conductive fillers in supportive polymers to show limited use in modern technologies. This work that is disclosed here, for the first time, introduces stimuli-driven transition from biphasic to monophasic state of liquid metal into polymer science to form dynamic soft conductors from the binary metal-polymer composites. Read More

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September 2021

Oriented in situ immobilization of a functional tyrosinase on microcrystalline cellulose effectively incorporates DOPA residues in bioengineered mussel adhesive protein.

Biotechnol J 2021 Sep 18:e2100216. Epub 2021 Sep 18.

Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea.

Background: Catechol-containing polymers such as mussel adhesive proteins (MAPs) are attractive as biocompatible adhesive biomaterials, and the catecholic amino acid 3,4-dihydroxyphenyl-L-alanine (DOPA) is considered a key molecule in underwater mussel adhesion. Tyrosinases can specifically convert tyrosine to DOPA without any cofactors. However, their catalytic properties still need to be adjusted to minimize unwanted DOPA oxidation via their diphenolase activity and catechol instability at neutral and basic pH values in the reaction products. Read More

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September 2021

Atomic Scale Control and Visualization of Topological Quantum Phase Transition in π-Conjugated Polymers Driven by Their Length.

Adv Mater 2021 Sep 18:e2104495. Epub 2021 Sep 18.

Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University, Olomouc, 78371, Czech Republic.

Quantum phase transitions (QPTs) driven by quantum fluctuations are transitions between distinct quantum phases of matter. At present, they are poorly understood and not readily controlled. Here, scanning tunneling microscopy (STM) and noncontact atomic force microscopy (nc-AFM) are used to explore atomic scale control over quantum phase transitions between two different topological quantum states of a well-defined π-conjugated polymer. Read More

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September 2021

Experimental and computational analysis of a pharmaceutical-grade shape memory polymer applied to the development of gastroretentive drug delivery systems.

J Mech Behav Biomed Mater 2021 Sep 8;124:104814. Epub 2021 Sep 8.

Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25133, Brescia, Italy; Italian Interuniversity Consortium on Materials Science and Technology (INSTM), Research Unit of Brescia, Via Branze 38, 25133, Brescia, Italy. Electronic address:

The present paper aims at developing an integrated experimental/computational approach towards the design of shape memory devices fabricated by hot-processing with potential for use as gastroretentive drug delivery systems (DDSs) and for personalized therapy if 4D printing is involved. The approach was tested on a plasticized poly(vinyl alcohol) (PVA) of pharmaceutical grade, with a glass transition temperature close to that of the human body (i.e. Read More

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September 2021

Thin Thermoresponsive Polymer Films for Cell Culture: Elucidating an Unexpected Thermal Phase Behavior by Atomic Force Microscopy.

Langmuir 2021 Sep 17. Epub 2021 Sep 17.

Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), 8-2 Trubetskaya Street, Moscow 119991, Russia.

Application of poly--isopropylacrylamide (PNIPAM) and its more hydrophobic copolymers with --butylacrylamide (NtBA) as supports for cell sheets has been validated in numerous studies. The binary systems of these polymers with water are characterized by a lower critical solution temperature (LCST) in a physiologically favorable region. Upon lowering the temperature below the LCST, PNIPAM chains undergo a globule-to-coil transition, causing the film dissolution and cell sheet detachment. Read More

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September 2021

High Performance of Anion Exchange Blend Membranes Based on Novel Phosphonium Cation Polymers for All-Vanadium Redox Flow Battery Applications.

ACS Appl Mater Interfaces 2021 Sep 17. Epub 2021 Sep 17.

Qatar Environment & Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, Doha 34110, Qatar.

The deployment of alkaline anion exchange membranes (AEMs) in flow battery applications has the advantage of a low cationic species crossover rate. However, the alkaline stability conjugated to the low conductivity of hydroxide ions of anion exchange membranes (AEMs) still represents a major drawback for the large deployment of such technology. In this study, three types of tetraarylpolyphosphonium (pTAP)-based copolymers (namely, CP1, CP2, and CP3) are synthesized and blended with chitosan and polyvinylidene fluoride (PVDF) for the fabrication of AEMs. Read More

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September 2021

Stepping towards benign alternatives: sustainable conversion of plastic waste into valuable products.

Chem Commun (Camb) 2021 Sep 17. Epub 2021 Sep 17.

Inorganic and Physical Chemistry Laboratory, Council of Scientific and Industrial Research (CSIR)-Central Leather Research Institute (CLRI), Chennai 600020, Tamil Nadu, India.

The extensive use of plastic and the absence of efficient and sustainable methods for its degradation has raised critical concerns about its disposal and degradation. Furthermore, the escalated use of personal protective equipment (PPE) and masks during the ongoing COVID-19 pandemic has put us under tremendous pressure of generating huge amounts of plastic waste. Traditional plastic waste disintegration protocols, while effective, pose additional inevitable environmental risks. Read More

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September 2021

Controllable Frontal Polymerization and Spontaneous Patterning Enabled by Phase-Changing Particles.

Small 2021 Sep 16:e2102217. Epub 2021 Sep 16.

Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana, IL, 61801, USA.

Frontal polymerization provides a rapid, economic, and environmentally friendly methodology to manufacture thermoset polymers and composites. Despite its efficiency and reduced environmental impact, the manufacturing method is underutilized due to the limited fundamental understanding of its dynamic control. This work reports the control and patterning of the front propagation in a dicyclopentadiene resin by immersion of phase-changing polycaprolactone particles. Read More

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September 2021

Critical behavior of magnetic polymers in two and three dimensions.

Phys Rev E 2021 Aug;104(2-1):024122

Institute of Physics, Bhubaneswar, Odisha 751005, India and Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India.

We explore the critical behavior of two- and three-dimensional lattice models of polymers in dilute solution where the monomers carry a magnetic moment which interacts ferromagnetically with near-neighbor monomers. Specifically, the model explored consists of a self-avoiding walk on a square or cubic lattice with Ising spins on the visited sites. In three dimensions we confirm and extend previous numerical work, showing clearly the first-order character of both the magnetic transition and the polymer collapse, which happen together. Read More

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Enantioselective liquid-liquid extraction of tryptophan enantiomers by a recyclable aqueous biphasic system based on stimuli-responsive polymers.

J Chromatogr A 2021 Sep 4;1656:462532. Epub 2021 Sep 4.

Institute of Bast Fiber Crops and Center of Southern Economic Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China. Electronic address:

The hydrophobic organic solvents/water biphasic system had been always used in the traditional enantioselective liquid-liquid extraction (ELLE). In recent years, aqueous biphasic systems (ABSs) are considered as a promising method used in the ELLE. In the present work, a recyclable ABS composed of a temperature-responsive polymer poly(MAH-β-CD-co-NIPAAm) (P) and a pH-responsive polymer poly(AA-DMAEMA-BMA) (P) was employed in the enantioseparation of tryptophan enantiomers. Read More

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September 2021

Local structuring of diketopyrrolopyrrole (DPP)-based oligomers from molecular dynamics simulations.

Phys Chem Chem Phys 2021 Sep 15;23(35):19693-19707. Epub 2021 Sep 15.

Department of Chemistry, University of Liverpool, Crown Place, Liverpool, L69 7ZD, UK.

The microscopic structure of high mobility semiconducting polymers is known to be essential for their performance but it cannot be easily deduced from the available experimental data. A series of short oligomers of diketopyrrolopyrrole (DPP)-based materials that display high charge mobility are studied by molecular dynamics simulations to understand their local structuring at an atomic level. Different analyses are proposed to compare the ability of different oligomers to form large aggregates and their driving force. Read More

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September 2021

Acrylic Paints: An Atomistic View of Polymer Structure and Effects of Environmental Pollutants.

J Phys Chem B 2021 Sep 15. Epub 2021 Sep 15.

Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

Most of the artwork and cultural heritage objects are stored in museums under conditions that are difficult to monitor. While advanced technologies aim to control and prevent the degradation of cultural heritage objects in line with preventive conservation measures, there is much to be learned in terms of the physical processes that lead to the degradation of the synthetic polymers that form the basis of acrylic paints largely used in contemporary art. In museums, stored objects are often exposed to temperature and relative humidity fluctuations as well as airborne pollutants such as volatile organic compounds (VOCs). Read More

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September 2021

Catalyst-free Vitrimer Cross-linked By Biomass-derived Compounds with Mechanical Robustness, Reprocessability and Multi-shape Memory Effects.

Macromol Rapid Commun 2021 Sep 15:e2100432. Epub 2021 Sep 15.

Key Laboratory of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.

Vitrimerization of thermoset polymers plays an important role in addressing resource recovery and reuse. Vitrimer elastomers with good mechanical properties often require well-designed crosslinking agents or fillers, but this increases processing complexity or reduces vitrimer dynamic properties. In this report, we design a simple green strategy to build a strong vitrimer elastomer. Read More

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September 2021

Design of Persistent and Stable Porous Radical Polymers by Electronical Isolation Strategy.

Angew Chem Int Ed Engl 2021 Sep 15. Epub 2021 Sep 15.

State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Institute of Polymer Optoelectronic Materials and Devices, No. 381 Wushan, Tianhe District, 510640, Guangzhou, CHINA.

Conjugated organic radical polymers with stable radical features are difficult to design because the π conjugation in the polymer backbones makes the radicals readily delocalize and tend to undergo covalent bonding processes. In this work, we report an electronical isolation strategy to design stable porous radical polymers by homocoupling reaction from a meta-position active monomer. The meta linkage ensures less conjugation in the polymer skeletons, localizes the resonant radicals, and prevent them from recombination. Read More

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September 2021

Thermoresponsive Polymers Based On Tertiary Amine Moieties.

Macromol Rapid Commun 2021 Sep 15:e2100504. Epub 2021 Sep 15.

Key Laboratory of Functional Polymer Materials of the Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.

Thermoresponsive polymers exhibiting unique reversible phase transition properties in aqueous solution in response to temperature stimuli have been extensively investigated. In the past two decades, thermoresponsive polymers based on tertiary amine moieties have achieved considerable progress and become an important family of thermoresponsive polymers, including tertiary amine functionalized poly((meth)acrylamide)s, poly((meth)acrylate)s, poly(styrene)s, poly(vinyl alcohol)s and poly(ethylene oxide)s, which exhibit LCST and/or UCST in water or aliphatic alcohols. Their phase transition behavior can be modulated by the solution pH and CO due to the protonation of tertiary amine moieties in acidic condition and deprotonation in alkaline condition and the charged ammonium bicarbonate formed by the tertiary amine moieties and CO . Read More

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September 2021

Dual crystalline-amorphous salen-metal complexes behave like nematic droplets with AIEgens vistas.

Dalton Trans 2021 Sep 15. Epub 2021 Sep 15.

Department of Inorganic Polymers, "Petru Poni" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania.

A series of metal salen complexes, original in view of the presence in their structure of a highly flexible and hydrophobic spacer, were prepared on the basis of the reaction of 1,3-bis(3-aminopropyl)tetramethyldisiloxane with 3,5-dichloro-, 3,5-dibromo- and 3-hydroxy-salicylaldehyde and various metal ions (Co, Ni, Cu and Zn). The isolated products were completely characterized from the structural point of view by FTIR, NMR, elemental analysis and single crystal X-ray diffraction, and further investigated from the perspective of the behavior induced mainly by the structural peculiarities. Emphasis is placed on self-assembly properties, both in bulk and in solution, depending on temperature, solvent nature and concentration, including thermotropic and lyotropic liquid crystals (LC). Read More

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September 2021

Room-Temperature Metal-Free Multicomponent Polymerizations of Elemental Selenium toward Stable Alicyclic Poly(oxaselenolane)s with High Refractive Index.

J Am Chem Soc 2021 Sep 14. Epub 2021 Sep 14.

State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, China.

Selenium-containing polymers are a group of fascinating functional polymers with unique structures, properties, and applications, which have been developed recently but only with limited examples. The challenges of developing selenium-containing polymers with structural and functional diversity include the lack of economic and safe monomers, lack of efficient and convenient synthetic approaches, and poor stability of selenium-involving covalent bonds. In this work, room-temperature metal-free multicomponent polymerizations (MCPs) of elemental selenium, diisocyanides, and dipropargyl alcohols were developed, and polymers with a selenium-containing aliphatic heterocycle, 1,3-oxaselenolane, were synthesized through these MCPs directly from elemental selenium. Read More

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September 2021

Advanced Delivery Systems Based on Lysine or Lysine Polymers.

Mol Pharm 2021 Sep 14. Epub 2021 Sep 14.

School of Chemical Engineering, Oklahoma State University, 420 Engineering North, Stillwater, Oklahoma 74078, United States.

Polylysine and materials that integrate lysine form promising drug delivery platforms. As a cationic macromolecule, a polylysine polymer electrostatically interacts with cells and is efficiently internalized, thereby enabling intracellular delivery. Although polylysine is intrinsically pH-responsive, the conjugation with different functional groups imparts smart, stimuli-responsive traits by adding pH-, temperature-, hypoxia-, redox-, and enzyme-responsive features for enhanced delivery of therapeutic agents. Read More

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September 2021

Atomic Layer Deposition on Polymer Thin Films: On the Role of Precursor Infiltration and Reactivity.

ACS Appl Mater Interfaces 2021 Sep 14. Epub 2021 Sep 14.

Department of Solid State Sciences, CoCooN, Ghent University, Krijgslaan 281 S1, 9000 Gent, Belgium.

Inorganic barriers grown by atomic layer deposition (ALD) can overcome the stability issues originating from the permeation of foreign species (water and oxygen) into polymer thin films. Alternatively, infiltration of ALD species into the bulk of the polymer can be used to modify its characteristic properties. In this study, the feasibility of growing an inorganic barrier with ALD on polystyrene, poly(methyl methacrylate), and poly(ethylene terephthalate glycol) thin films is evaluated. Read More

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September 2021

Stimuli-responsive microgels with cationic moieties: characterization and interaction with cells.

Soft Matter 2021 Sep 14. Epub 2021 Sep 14.

DWI-Leibniz-Institute for Interactive Materials, Forckenbeckstraße 50, 52074 Aachen, Germany.

Stimuli-responsive microgel copolymer networks with ionizable functional groups have important applications for encapsulation of drugs, peptides, enzymes, proteins, or cells. Rational design of such networks can be based on characterization of stimuli-induced volume phase transition and spatial distribution of neutral and charged monomer units in crosslinked polymer chains. In this work we successfully synthesized poly(-vinylcaprolactam--1-vinyl-3-methylimidazolium) (poly(VCL-VIM)) microgels carrying permanent positive charges and demonstrate that H high-resolution NMR spectroscopy in combination with transverse () magnetization relaxometry allows investigating separately the behavior of each functional group in the microgel network. Read More

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September 2021

Artificial Chameleon Skin with Super-Sensitive Thermal and Mechanochromic Response.

ACS Nano 2021 Sep 14. Epub 2021 Sep 14.

State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2# Linggong Road, Dalian 116024, P.R. China.

Both the nonclose-packed structure and the large refractive index contrast of guanine nanocrystals and cytosols in iridophores play a vital role in the dynamic camouflage of chameleons, including the bright skin color and color tuning sensitivity to external stimulus. Here, the nonclose-packed photonic crystals consisting of ZnS nanospheres and polymers, which have similar refractive indices with guanine nanocrystals and cytosols, respectively, are constructed by a two-step filling strategy. [email protected] nanospheres are self-assembled to build intermediate close-packed photonic crystals followed by filling polymers in their interstices. Read More

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September 2021

Fabrication of stable multivariate metal-organic frameworks with excellent adsorption performance toward bisphenols from environmental samples.

Talanta 2021 Dec 21;235:122818. Epub 2021 Aug 21.

State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Hong Kong, China.

As a type of environmental endocrine disrupting chemicals, bisphenols (BPs) have a certain embryonic toxicity and teratogenicity, which can significantly increase the risks of breast cancer, prostate cancer, leukemia and other cancers. In this work, stable multivariate metal-organic frameworks (UiO-66-NH/TCPP) were synthesized via in situ one-pot method and used as miniaturized dispersive solid-phase extraction (dμSPE) sorbents for extraction of trace BPs from environmental samples. The phase purity, crystal morphology and physical properties of UiO-66-NH/TCPP samples were varied by adjusting the mass ratio of TCPP. Read More

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December 2021

Selective identification and separation of ReO by biomimetic flexible temperature-sensitive imprinted composite membranes.

Talanta 2021 Dec 8;235:122791. Epub 2021 Aug 8.

State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchang, 737100, GanSu, China.

A new type of temperature-sensitive imprinted composite membranes(ICMs) was developed. Poly N,N-diethylacrylamide (DEA) blocks, as temperature-sensitive polymer, were grafted onto the substrate of the imprinted polymer separation layer to endow membranes with better adsorption effect. The comprehensive properties of the imprinted composite membranes were adequately tested and evaluated in detail. Read More

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December 2021

Effect of calcium stearate as a lubricant and catalyst on the thermal degradation of poly(3-hydroxybutyrate).

Int J Biol Macromol 2021 Sep 11;190:780-791. Epub 2021 Sep 11.

Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania.

Poly(3-hydroxybutyrate) (PHB) is a promising substitute to petroleum-based polymers in packaging and biomedical applications provided that its melt processability and degradability are improved. A new method to control the properties of PHB by using cheap calcium stearate (CS) as a lubricant and decomposition catalyst in melt-mixed PHB-CS compounds was first used. CS is composed of a metallic cation, which promotes PHB degradation, and a hydrophobic anion that improves the compatibility with PHB and processability. Read More

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September 2021

Enzymatic characterization of D-lactate dehydrogenase and application in alanine aminotransferase activity assay kit.

Bioengineered 2021 Dec;12(1):6459-6471

Department of Research, Ningbo Institute of Life and Health Industry, University of Chinese Academy of Sciences, Ningbo, China.

D-lactate dehydrogenase (D-LDH) is widely used for the clinical detection of alanine aminotransferase (ALT) activity. It is a key enzyme in ALT detection kits, and its enzymatic properties directly determine sensitivity and accuracy of such kits. In this study, D-lactate dehydrogenase (WP_011543503, LDH) coding sequence derived from was obtained from the NCBI database by gene mining. Read More

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December 2021

Preparation, characterization, and in vivo evaluation of levonorgestrel-loaded thermostable microneedles.

Drug Deliv Transl Res 2021 Sep 13. Epub 2021 Sep 13.

Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

To facilitate the storage and use of poly (lactic-co-glycolic acid) (PLGA)-based microneedles (MNs) in hot seasons and regions, thermally stable MNs loaded with levonorgestrel (LNG) were developed. Due to its good biocompatibility and high glass transition temperature (T), Hydroxypropyl methylcellulose (HPMC) was added to the PLGA-based MNs to increase thermal stability. MNs with HPMC exhibited excellent thermal stability at high temperatures. Read More

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September 2021

Insight into dual fluorescence effects induced by molecular aggregation occurring in membrane model systems containing 1,3,4-thiadiazole derivatives.

Eur Biophys J 2021 Sep 13. Epub 2021 Sep 13.

Department of Biophysics, University of Life Sciences in Lublin, Lublin, Poland.

This work reports on biophysical insights into the excited state intramolecular proton transfer (ESIPT) processes taking place in three 1,3,4-thiadiazole derivatives that served as model compounds, on which electronic absorption, fluorescence, Fourier-transform infrared spectroscopy (FTIR), surface plasmon resonance (SPR) and electrochemical impedance spectroscopy (EIS) studies were performed. The fluorescence spectra recorded in various solvents revealed an interesting dual fluorescence effect. In molecules in their monomeric form, the effect is associated with the ESIPT phenomenon, and may be further enhanced by aggregation-related effects, such as aggregation-induced emissions. Read More

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September 2021

Nanomaterials in Smart Packaging Applications: A Review.

Small 2021 Sep 12:e2101171. Epub 2021 Sep 12.

Electrical and Computer Engineering (ECE) Department, McMaster University, 1280 Main Street W, Hamilton, Ontario, L8S 4K1, Canada.

Food wastage is a critical and world-wide issue resulting from an excess of food supply, poor food storage, poor marketing, and unstable markets. Since food quality depends on consumer standards, it becomes necessary to monitor the quality to ensure it meets those standards. Embedding sensors with active nanomaterials in food packaging enables customers to monitor the quality of their food in real-time. Read More

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September 2021