49,698 results match your criteria thermal properties

Co-hydrothermal carbonization of swine manure and cellulose: Influence of mutual interaction of intermediates on properties of the products.

Sci Total Environ 2021 May 29;791:148134. Epub 2021 May 29.

School of Material Science and Engineering, University of Jinan, Jinan 250022, China. Electronic address:

Co-hydrothermal carbonization (HTC) of livestock manure and biomass might improve the fuel properties of the hydrochar due to the high reactivity of the biomass-derived intermediates with the abundant oxygen-containing functionalities. However, the complicated compositions make it difficult to explicit the specific roles of the individual components of biomass played in the co-HTC process. In this study, cellulose was used for co-HTC with swine manure to investigate the influence on the properties of the hydrochar. Read More

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Lignin-containing polyurethane elastomers with enhanced mechanical properties via hydrogen bond interactions.

Int J Biol Macromol 2021 Jun 9. Epub 2021 Jun 9.

College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China; Key Laboratory of Bio-based Materials Science & Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, PR China. Electronic address:

In this work, lignin-containing polyester polyol (LPES) was successfully synthesized by vacuum melting method with lignin instead of polyol, and then reacted with isocyanate and chain extender to obtain lignin-based polyurethane elastomer (LPUE). The effects of lignin as reactive raw material, chain extender, and filler on the structure, thermostability, mechanical performance, and self-healing properties of elastomers were systematically studied, respectively. The comprehensive mechanical properties of the obtained materials were significantly enhanced after the introduction of lignin, especially the maximum tensile strength increased to 26. Read More

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Highly absorbent hydrogels comprised from interpenetrated networks of alginate-polyurethane for biomedical applications.

J Mater Sci Mater Med 2021 Jun 12;32(6):70. Epub 2021 Jun 12.

Universidad Politécnica de Pénjamo, Carretera Irapuato - La Piedad Km 44, Pénjamo, 36921, Guanajuato, México.

Developing new approaches to improve the swelling, degradation rate, and mechanical properties of alginate hydrogels without compromising their biocompatibility for biomedical applications represents a potential area of research. In this work, the generation of interpenetrated networks (IPN) comprised from alginate-polyurethane in an aqueous medium is proposed to design hydrogels with tailored properties for biomedical applications. Aqueous polyurethane (PU) dispersions can crosslink and interpenetrate alginate chains, forming amide bonds that allow the structure and water absorption capacity of these novel hydrogels to be regulated. Read More

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Microfibrillated cellulose films containing chitosan and tannic acid for wound healing applications.

J Mater Sci Mater Med 2021 Jun 12;32(6):67. Epub 2021 Jun 12.

Department of Paper sciences and engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

The effectiveness of tannic acid as antimicrobial and wound healing for burns have been shown for a century; however, uncontrolled target dosage may result in undesirable side-effects. Remarkably, tannic acid polyphenols compounds crosslinked with polymeric materials produce a strong composite containing the beneficial properties of this tannin. However, investigation of the crosslink structure and its antibacterial and regenerative properties are still unknown when using nanocellulose by mechanical defibrillation; additionally, due to the potential crosslink structure with chitosan, its structure can be complex. Read More

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Enhanced isomerization of rare sugars by ribose-5-phosphate isomerase A from Ochrobactrum sp. CSL1.

Enzyme Microb Technol 2021 Aug 26;148:109789. Epub 2021 Mar 26.

School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou, 215009, PR China. Electronic address:

Ribose-5-phosphate isomerase A (RpiA) is of great importance in biochemistry research, however its application in biotechnology has not been fully explored. In this study the activity of RpiA from Ochrobactrum sp. CSL1 (OsRpiA) towards D-allose was engineered based on sequential and structural analyses. Read More

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Ultralow lattice thermal conductivity and dramatically enhanced thermoelectric properties of monolayer InSe induced by an external electric field.

Phys Chem Chem Phys 2021 Jun 12. Epub 2021 Jun 12.

Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China.

With the ability to alter the inherent interatomic electrostatic interactions, modulating external electric field strength is a promising approach to tune the phonon transport behavior and enhance the thermoelectric performance of two-dimensional (2D) materials. Here, by applying an electric field (Ez = 0.1 V Å-1), it is predicted that an ultralow value of the lattice thermal conductivity (0. Read More

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Liberation of insoluble-bound phenolics from lentil hull matrices as affected by Rhizopus oryzae fermentation: Alteration in phenolic profiles and their inhibitory capacities against low-density lipoprotein (LDL) and DNA oxidation.

Food Chem 2021 Jun 3;363:130275. Epub 2021 Jun 3.

Department of Biochemistry, Memorial University of Newfoundland, St. John's, NL A1B 3X9, Canada. Electronic address:

Fermentation is an effective non-thermal food processing operation used for enhancing the nutritional and functional properties of food. HPLC-ESI-MS/MS analysis and inhibitory capacity of the soluble- and insoluble-bound phenolics in lentil hulls in retarding the oxidation of LDL and DNA strand scission were determined following fermentation. In HPLC-ESI-MS/MS analysis, most insoluble-bound phenolics in lentil hulls were significantly decreased, indicating their liberation from the cell wall matrix upon fermentation. Read More

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Cassava starch-processing residue utilization for packaging development.

Int J Biol Macromol 2021 Jun 8. Epub 2021 Jun 8.

Laboratory of Packaging Technology and Membrane Development, LATEM, Department of Chemical Engineering, Universidade Federal do Rio Grande do Sul (UFRGS), Street Ramiro Barcellos, 2777 Anexo I, ZC: 90035-007 Porto Alegre, RS, Brazil.

The starch-based film development has been extensively studied since, in general, it is possible to obtain transparent, non-toxic, odorless, good gas barrier, biodegradable, and tasteless samples. However, world hunger-related problems are a reality and the use of starches, a recognized carbohydrate source, in the packaging industry should be avoided. Thus, the use of different residual starchy can minimize the costs of production, promoting the development of innovative biomaterials, eliminating the competition with the food chain. Read More

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β-cyclodextrin chitosan-based hydrogels with tunable pH-responsive properties for controlled release of acyclovir: design, characterization, safety, and pharmacokinetic evaluation.

Drug Deliv 2021 Dec;28(1):1093-1108

Department of Pharmacy, The Women University, Multan, Pakistan.

In this work, series of pH-responsive hydrogels (FMA1-FMA9) were synthesized, characterized, and evaluated as potential carrier for oral delivery of an antiviral drug, acyclovir (ACV). Different proportions of β-cyclodextrin (β-CD), chitosan (CS), methacrylic acid (MAA) and N' N'-methylenebis-acrylamide (MBA) were used to fabricate hydrogels free radical polymerization technique. Fourier transform infrared spectroscopy confirmed fabrication of new polymeric network, with successful incorporation of ACV. Read More

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December 2021

High-Performance Joule Heating and Electromagnetic Shielding Properties of Anisotropic Carbon Scaffolds.

ACS Appl Mater Interfaces 2021 Jun 11. Epub 2021 Jun 11.

Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, P. R. China.

Highly efficient electrical heaters along with excellent electromagnetic interference (EMI) shielding properties are urgently required for the progress of miniaturization electronics, artificial intelligence, and smart heating management setups. Herein, lignin removal, which comprises two efficient and versatile steps, followed by carbonization produces multifunctional carbon monoliths derived from natural wood. The obtained carbonized wood exhibits a high specific surface area (655. Read More

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Synthesis and Characterization of the Potential Melt-Castable Explosive 3-(1,2,4-Oxadiazolyl)-5-Nitratomethyl Isoxazole.

Chempluschem 2021 Jun;86(6):875-878

CCDC US Army Research Laboratory, Polymers Branch, Aberdeen, Proving Ground, MD 21005, USA.

The synthesis of 3-(1,2,4-oxadiazolyl)-5-nitratomethyl isoxazole (C H N O ), its physical properties, and its theoretical performances are described. This energetic material was found to have a melting point range of 76.6-79. Read More

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Room-Temperature Magnetic Field Effect on Excitonic Photoluminescence in Perovskite Nanocrystals.

Adv Mater 2021 Jun 10:e2008225. Epub 2021 Jun 10.

State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China.

Magnetic-field-enhanced spin-polarized electronic/optical properties in semiconductors are crucial for fabricating various spintronic devices. However, this spin polarization is governed by weak spin exchange interactions and easily randomized by thermal fluctuations; therefore, it is only produced at cryogenic temperatures, which severely limits the applications. Herein, a room-temperature intrinsic magnetic field effect (MFE) on excitonic photoluminescence is achieved in CsPbX :Mn (X = Cl, Br) perovskite nanocrystals. Read More

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Enzymatically synthesised MnO nanoparticles for efficient near-infrared photothermal therapy and dual-responsive magnetic resonance imaging.

Nanoscale 2021 Jun 11. Epub 2021 Jun 11.

School of Chemistry and Chemical Engineering, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, Huazhong University of Science and Technology, Wuhan 430074, China.

Manganese dioxide (MnO2) nanoparticles (NPs) are highly attractive for biomedical applications due to their biocompatibility, stimuli-responsive magnetic resonance imaging (MRI) properties and capability to modulate the hypoxic tumour microenvironment (TME). However, conventional MnO2 NPs do not possess photothermal therapy (PTT) functions except for hybrids with other photothermal materials. Herein, we first reveal the extraordinary photothermal conversion efficiency (44%) of enzymatically synthesised MnO2 NPs (Bio-MnO2 NPs), which are distinct from chemically synthesised MnO2 NPs. Read More

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Influence of early thermal-oxidative ageing on the structure and properties of polyoxymethylene copolymer.

R Soc Open Sci 2021 Jun 9;8(6):210034. Epub 2021 Jun 9.

Department of Polymer Processing and Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, People's Republic of China.

Thermal-oxidative ageing of polyoxymethylene (POM) copolymer in the oven at 100°C for 1, 2, 3, 5, 7, 10, 14 and 21 days and the influence of early thermal-oxidative ageing on POM structure and properties were studied by means of wide-angle X-ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetry and tensile test. Based on the results, we found that the early thermal-oxidative ageing of POM copolymer can be divided into three regions. The region I is the initial 3 days. Read More

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Thermoelectric performances for both p- and n-type GeSe.

R Soc Open Sci 2021 Jun 9;8(6):201980. Epub 2021 Jun 9.

College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu 610059, People's Republic of China.

In this paper, the thermoelectric properties of p-type and n-type GeSe are studied systematically by using first principles and Boltzmann transport theory. The calculation includes electronic structure, electron relaxation time, lattice thermal conductivity and thermoelectric transport properties. The results show that GeSe is an indirect band gap semiconductor with band gap 1. Read More

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Colloidal density control with Bessel-Gauss beams.

Sci Rep 2021 Jun 10;11(1):12284. Epub 2021 Jun 10.

CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL, USA.

Optical manipulation of colloidal systems is of high interest for both fundamental studies and practical applications. It has been shown that optically induced thermophoresis and nonlinear interactions can significantly affect the properties of dense colloidal media. However, macroscopic scale phenomena can also be generated at thermal equilibrium. Read More

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Smart material based on boron crosslinked polymers with potential applications in cancer radiation therapy.

Sci Rep 2021 Jun 10;11(1):12269. Epub 2021 Jun 10.

Laboratorio de Investigación e Instrumentación en Física Aplicada a la Medicina e Imágenes por Rayos X (LIIFAMIRx), FAMAF-UNC, Córdoba, X5000HUA, Argentina.

Organoboron compounds have been playing an increasingly important role in analytical chemistry, material science, health applications, and particularly as functional polymers like boron carriers for cancer therapy. There are two main applications of boron isotopes in radiation cancer therapy, Boron Neutron Capture Therapy and Proton Boron Fusion Therapy. In this study, a novel and original material consisting of a three-dimensional polymer network crosslinked with [Formula: see text]B enriched boric acid molecules is proposed and synthesized. Read More

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Wide-range lifetime-tunable and responsive ultralong organic phosphorescent multi-host/guest system.

Nat Commun 2021 Jun 10;12(1):3522. Epub 2021 Jun 10.

Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) & Xi'an Institute of Biomedical Materials and Engineering (IBME), Northwestern Polytechnical University, Xi'an, China.

The rational lifetime-tuning strategy of ultralong organic phosphorescence is extraordinarily important but seldom reported. Herein, a series of multi-host/guest ultralong organic phosphorescence materials with dynamic lifetime-tuning properties were reported. By doping a non-room-temperature phosphorescence emitter into various solid host matrices with continuously reduced triplet energy levels, a wide-range lifetime (from 3. Read More

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Thermolabile essential oils, aromas and flavours: Degradation pathways, effect of thermal processing and alteration of sensory quality.

Food Res Int 2021 Jul 11;145:110404. Epub 2021 May 11.

Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology (NEIST), Jorhat, Assam 785006, India; AcSIR-Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201002, India. Electronic address:

Plant-based aroma chemicals, constituting the essential oils play a great role as the natural flavours and preservatives in the food industries. Many of these metabolites are susceptible to degradation under heat (i.e. Read More

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A novel thermal pretreatment method called air frying improves the enzymatic saccharification effect of straw.

Sci Total Environ 2021 Jun 1;790:148191. Epub 2021 Jun 1.

State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address:

Thermal pretreatment is a shared method to improve the efficiency of straw biochemical conversion. However, the process is often accompanied by problems such as the loss of carbon source. The objective of this study was to develop a novel thermal pretreatment method, called air frying, with less loss of biodegradable organic matter and favorable surface hydrophilicity. Read More

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Ultrasound-Engineered fabrication of immobilized molybdenum complex on Cross-Linked poly (Ionic Liquid) as a new acidic catalyst for the regioselective synthesis of pharmaceutical polysubstituted spiro compounds.

Ultrason Sonochem 2021 Jun 1;75:105614. Epub 2021 Jun 1.

Department of Chemistry, Qom Branch, Islamic Azad University, Qom, Islamic Republic of Iran.

A novel supported molybdenum complex on cross-linked poly (1-Aminopropyl-3-vinylimidazolium bromide) entrapped cobalt oxide nanoparticles has been successfully fabricated through two different procedures, i.e. ultrasound (US) irradiations (100 W, 40 kHz) and reflux. Read More

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Antinociceptive Effect of The Hydroethanolic Leaf Extract of Calotropis procera (Ait) R. Br. (Apocynaceae): possible involvement of glutamatergic, cytokines, opioidergic and adenosinergic pathways.

J Ethnopharmacol 2021 Jun 7:114261. Epub 2021 Jun 7.

School of Pharmacy and Pharmaceutical Sciences, University of Cape Coast, Cape Coast, Ghana. Electronic address:

Ethnopharmacological Relevance: Pain remains real and still a major problem in clinical medicine which requires new agents with improved efficacy for more therapeutic benefits. Plant sources can serve as a basis for the search for some novel drugs hence the analgesic effects of the hydroethanolic extract of Calotropis procera (CPE) which is widespread in Ghana and other tropical areas and used in folkloric medicine for painful and inflammatory conditions was evaluated.

Materials And Methods: The analgesic properties of orally administered CPE at doses of 30, 100, and 300 mg/kg were evaluated in thermal (tail immersion), chemical (acetic acid-writhing, formalin-induced paw licking, glutamate-induced nociception) and mechanical (Randall-Selitto) tests for analgesia. Read More

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The Influence of Physicochemical Properties on the Processibility of Conducting Polymers: A Bioelectronics Perspective.

Acta Biomater 2021 Jun 7. Epub 2021 Jun 7.

Imperial College London London ŪK. Electronic address:

Conducting polymers (CPs) possess unique electrical and electrochemical properties and hold great potential for different applications in the field of bioelectronics. However, the widespread implementation of CPs in this field has been critically hindered by their poor processibility. There are four key elements that determine the processibility of CPs, which are thermal tunability, chemical stability, solvent compatibility, and mechanical robustness. Read More

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An Untargeted Thermogravimetric Analysis-Fourier Transform Infrared-Gas Chromatography-Mass Spectrometry Approach for Plastic Polymer Identification.

Environ Sci Technol 2021 Jun 10. Epub 2021 Jun 10.

School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom.

Reliable chemical identification of specific polymers in environmental samples represents a major challenge in plastic research, especially with the wide range of commercial polymers available, along with variable additive mixtures. Thermogravimetric analysis-Fourier transform infrared-gas chromatography-mass spectrometry (TGA-FTIR-GC-MS) offers a unique characterization platform that provides both physical and chemical properties of the analyzed polymers. This study presents a library of 11 polymers generated using virgin plastics and post-consumer products. Read More

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Highly Thermal-Wet Comfortable and Conformal Silk-Based Electrodes for On-Skin Sensors with Sweat Tolerance.

ACS Nano 2021 Jun 10. Epub 2021 Jun 10.

Innovative Centre for Flexible Devices (iFLEX), Max Planck-NTU Joint Lab for Artificial Senses, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore.

Noninvasive and seamless interfacing between the sensors and human skin is highly desired for wearable healthcare. Thin-film-based soft and stretchable sensors can to some extent form conformal contact with skin even under dynamic movements for high-fidelity signals acquisition. However, sweat accumulation underneath these sensors for long-term monitoring would compromise the thermal-wet comfort, electrode adherence to the skin, and signal fidelity. Read More

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Direct Comparison of Three Buckling-Based Methods to Measure the Elastic Modulus of Nanobiocomposite Thin Films.

ACS Appl Mater Interfaces 2021 Jun 10. Epub 2021 Jun 10.

Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada.

To engineer tunable thin-film materials, the accurate measurement of their mechanical properties is crucial. However, characterizing the elastic modulus with current methods is particularly challenging for sub-micrometer thick films and hygroscopic materials because they are highly sensitive to environmental conditions and most methods require free-standing films which are difficult to prepare. In this work, we directly compared three buckling-based methods to determine the elastic moduli of supported thin films: (1) biaxial thermal shrinking, (2) uniaxial thermal shrinking, and (3) the mechanically compressed, strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) method. Read More

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Engineering of Interfacial Energy Bands for Synthesis of Photoluminescent 0D/2D Coupled MOF Heterostructure with Enhanced Selectivity toward the Proton-Exchange Membrane.

ACS Appl Mater Interfaces 2021 Jun 10. Epub 2021 Jun 10.

Department of Chemical Engineering, Indian Institute of Technology Tirupati, Tirupati 517506, India.

Engineering of the interface for tuning the structural, functional, and electronic properties of materials via the formation of heterostructure composites exhibits immense potential in the current research scenario. This study reports a novel ternary composite synthesized by decoration of zero-dimensional Pd nanoparticles (NPs) and two-dimensional (2D) graphite oxide (GO) sheets in the UiO-66 metal-organic framework (MOF). A mixed matrix membrane was fabricated by incorporating this composite in the SPEEK polymer matrix, which exhibited higher selectivity compared to commercial Nafion 117. Read More

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Design and Construction of Photochromic and Antileakage Reinforced Wood-Based Cellulose Microframework/Hexadecanol-Coconut Oil Composite Phase Change Material.

Langmuir 2021 Jun 10. Epub 2021 Jun 10.

School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.

The development of high-performance shape-stable phase change material composites (SPCMs) with high phase change enthalpy and high conversion efficiency, especially with good photochromic properties, is essential for thermal energy storage. Here, we report that one type of SPCMs with both photochromic and phase change energy storage is obtained by incorporating organic binary composite PCMs (hexadecanol/coconut oil, H/C) and photochromic phosphotungstic acid (PA) into Ochroma pyramidale wood-based cellulose microframe (DOW) through simple vacuum impregnation. When the ratio of hexadecanol to coconut oil is 3:7 and the ratio of phosphotungstic acid to ,-dimethylacetamide is 4:13. Read More

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Strong Anisotropy and Bipolar Conduction-Dominated Thermoelectric Transport Properties in the Polycrystalline Topological Phase of ZrTe.

Inorg Chem 2021 Jun 10. Epub 2021 Jun 10.

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.

ZrTe has unique features of a temperature-dependent topological electronic structure and anisotropic crystal structure and has obtained intensive attention from the thermoelectric community. This work revealed that the sintered polycrystalline bulk ZrTe possesses both (020) and (041) preferred orientations. The transport properties of polycrystalline bulk p-type ZrTe exhibits an obvious anisotropic characteristic, that is, the room-temperature resistivity and thermal conductivity, possessing anisotropy ratios of 0. Read More

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Thermal Treatment Effect on CO and NO Adsorption on Fe(II) and Fe(III) Species in FeO-Based MIL-Type Metal-Organic Frameworks: A Density Functional Theory Study.

Inorg Chem 2021 Jun 10. Epub 2021 Jun 10.

Department of Chemistry, Pritzker School of Molecular Engineering, James Franck Institute, University of Chicago, Chicago, Illinois 60637, United States.

The properties of metal-organic frameworks (MOFs) based on triiron oxo-centered (FeO) metal nodes are often related to the efficiency of the removal of the solvent molecules and the counteranion chemisorbed on the FeO unit by postsynthetic thermal treatment. Temperature, time, and the reaction environment play a significant role in modifying key features of the materials, that is, the number of open metal sites and the reduction of Fe(III) centers to Fe(II). IR spectroscopy allows the inspection of these postsynthetic modifications by using carbon monoxide (CO) and nitric oxide (NO) as probe molecules. Read More

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