Search results for "Molecular-Weight"

showing 10 items of 72 documents

Nano-hybrids based on quercetin and carbon nanotubes with excellent anti-oxidant activity

2016

Abstract Multi-functional nano-hybrids based on Quercetin (Q), a natural antioxidant, and functionalized Carbon Nanotubes (CNTs) have been formulated and used to prepare Ultra High Molecular Weight PolyEthylene (UHMWPE)-based nanocomposites. The study of the nanocomposites rheological behaviour shows that the immobilization of Q molecules onto CNTs outer surface leads to a beneficial effect on the state of the interface between polymer and nanoparticles. Additionally, the investigation of the thermo- and photo-oxidation processes reveals that the hybrids nanoparticles are able to exert a remarkable stabilizing action, due to strong physical interaction between Q and CNTs. In particular, the…

Materials scienceAntioxidantmedicine.medical_treatmentCarbon nanotubesNanoparticleCondensed Matter Physic02 engineering and technologyCarbon nanotube010402 general chemistry01 natural sciencesCarbon nanotubeRadical scavenging activityNanocompositeslaw.inventionchemistry.chemical_compoundlawNano-medicineMoleculeOrganic chemistryGeneral Materials ScienceUltra-high-molecular-weight polyethylenechemistry.chemical_classificationNanocompositeNanocompositeMechanical EngineeringOxidative degradationPolymer021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical scienceschemistryChemical engineeringMechanics of MaterialsCarbon nanotubes; Nanocomposites; Oxidative degradation; Quercetin; Radical scavenging activity; Materials Science (all); Condensed Matter Physics; Mechanics of Materials; Mechanical EngineeringQuercetinMaterials Science (all)0210 nano-technologyMaterials Letters
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Advanced ultra-high molecular weight polyethylene/antioxidant-functionalized carbon nanotubes nanocomposites with improved thermo-oxidative resistance

2015

Multiwalled carbon nanotubes (CNTs) functionalized with hindered phenol moieties are dispersed in ultra-high molecular weight polyethylene (UHMWPE), and the stabilizing action of the antioxidant (AO) functionalized CNTs (AO-f-CNTs) is studied through a combination of rheological and spectroscopic (FT-IR) analyses. The effectiveness of two alternative compounding methods, namely hot compaction (HC) and melt mixing (MM), is compared. The combination of high temperature and mechanical stress experienced during MM brings about noticeable degradation phenomena of the matrix already in the course of the compounding step. Differently, the milder conditions of the HC process preserve the stability …

Materials sciencePolymers and PlasticsCarbon nanotubelaw.inventionnanotubesCoatings and Filmschemistry.chemical_compoundlawgraphene and fullerenesMaterials Chemistrydegradation graphene and fullerenes nanotubes polyolefinsComposite materialpolyolefindegradationchemistry.chemical_classificationUltra-high-molecular-weight polyethyleneNanocompositeChemistry (all)Metals and AlloysGeneral ChemistryPolymerPolyethyleneGraftingdegradation; graphene and fullerenes; nanotubes; polyolefins; Chemistry (all); Surfaces Coatings and Films; Polymers and Plastics; Materials Chemistry; 2506; Metals and AlloysSurfaces Coatings and FilmsSurfaceschemistryCompoundinggraphene and fullerenenanotube2506Dispersion (chemistry)polyolefins
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Thermo-oxidative resistant nanocomposites containing novel hybrid-nanoparticles based on natural polyphenol and carbon nanotubes

2015

Abstract Quercetin (Q), a natural antioxidant molecule, is physically immobilized onto multi-walled carbon nanotubes (CNTs) bearing covalently-linked long-chain alkyl functional groups, and the so obtained hybrid-nanoparticles are used to prepare Ultra High Molecular Weight PolyEthylene-based nanocomposite films with enhanced thermo-oxidation resistance. The effective immobilization of the Q molecules is confirmed by spectroscopic (micro-Raman, ATR-FTIR, and FTIR) and thermo-gravimetric analyses, and the influence of the nanoparticles on the rheological behaviour and thermo-oxidative stability of the nanocomposites are investigated. Rheological analyses (linear viscoelasticity and stress re…

Materials sciencePolymers and PlasticsNanoparticleMulti-walled carbon nanotubesCarbon nanotubeNanocompositeslaw.inventionchemistry.chemical_compoundUltra-high molecular weight polyethylene (UHMWPE)lawMaterials ChemistryMoleculeMechanics of MaterialSolubilityComposite materialAlkylMaterials Chemistry2506 Metals and AlloyUltra-high-molecular-weight polyethylenechemistry.chemical_classificationPolymers and PlasticNanocompositeNanocompositeMetals and AlloysMulti-walled carbon nanotubes; Nanocomposites; Quercetin; Thermo-oxidation resistance; Ultra-high molecular weight polyethylene (UHMWPE); Condensed Matter Physics; Mechanics of Materials; Polymers and Plastics; Materials Chemistry; 2506; Metals and AlloysPolyethyleneCondensed Matter PhysicsMulti-walled carbon nanotubeSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiChemical engineeringchemistryMechanics of MaterialsQuercetin2506Thermo-oxidation resistancePolymer Degradation and Stability
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Multi-functional polyhedral oligomeric silsesquioxane-functionalized carbon nanotubes for photo-oxidative stable Ultra-High Molecular Weight Polyethy…

2016

Abstract Nanohybrid (phPOSS- f -CNTs) based on Carbon Nanotubes (CNTs) and Phenyl Polyhedral Olygomenric Silsesquioxane (phPOSS) have been synthesized to be used as multifunctional filler for polymer nanocomposites. The success of the functionalization procedure has been demonstrated via accurate spectroscopic, spectrometric and thermo-gravimetric analyses. The results reveal that a large portion of phPOSS is covalently linked to CNTs, while a small amount of phPOSS remains physically adsorbed due to the strong interactions coming from π electron coupling between the CNTs and phenyl rings in phPOSS. Small amounts (1 wt.%) of phPOSS- f -CNTs have been dispersed in Ultra High Molecular Weight…

Materials sciencePolymers and PlasticsPolymer nanocompositeCarbon NanotubeUHMWPEPOSS Carbon Nanotubes Functionalization UHMWPE Photo-oxidation resistanceGeneral Physics and Astronomy02 engineering and technologyCarbon nanotube010402 general chemistry01 natural scienceslaw.inventionPhysics and Astronomy (all)chemistry.chemical_compoundlawMaterials ChemistryMoleculeComposite materialFunctionalizationPOSSUltra-high-molecular-weight polyethylenePolymers and PlasticNanocompositeOrganic ChemistryCarbon Nanotubes; Functionalization; Photo-oxidation resistance; POSS; UHMWPE; Physics and Astronomy (all); Polymers and Plastics; Organic ChemistryPhoto-oxidation resistance021001 nanoscience & nanotechnologySilsesquioxane0104 chemical scienceschemistryChemical engineeringCovalent bondSurface modificationCarbon Nanotubes0210 nano-technologyEuropean Polymer Journal
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Tunable radical scavenging activity of carbon nanotubes through sonication

2016

Abstract Carbon nanotubes (CNTs) having controlled radical scavenging activity have been achieved tuning the content of their lattice defects induced by an ultra-sound (us) treatment. The reactivity of CNTs, subjected to ultra-sonication for different time intervals, toward 1,1-diphenyl-2-pycryl (DPPH) and hydroxyl (•OH) radicals has been estimated and related to defect concentration, evaluated through Raman spectrometry. The radical scavenging efficiency of ultra-sound treated CNTs (us-CNTs) increases with increasing the content of the structural defects, suggesting that the defect resulting from us treatment can be capitalized to obtain an amplified and controlled radical scavenging activ…

Materials scienceSonicationRadical02 engineering and technologyCarbon nanotube010402 general chemistry01 natural scienceslaw.inventionsymbols.namesakechemistry.chemical_compoundDISPERSIONlawANTIOXIDANTCOMPOSITESOrganic chemistryMOLECULAR-WEIGHT POLYETHYLENEGeneral Materials ScienceReactivity (chemistry)ScavengingUltra-high-molecular-weight polyethyleneNanocompositeChemistry (all)General ChemistrySettore CHIM/06 - Chimica Organica021001 nanoscience & nanotechnologyNANOCOMPOSITES0104 chemical sciencesSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistryChemical engineeringsymbolsFUNCTIONALIZATION0210 nano-technologyRaman spectroscopy
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2019 ESC Guidelines for the diagnosis and management of acute pulmonary embolism developed in collaboration with the European Respiratory Society (ER…

2020

Guidelines summarize and evaluate available evidence with the aim of assisting health professionals in proposing the best management strategies for an individual patient with a given condition. Guidelines and their recommendations should facilitate decision making of health professionals in their daily practice. However, the final decisions concerning an individual patient must be made by the responsible health professional(s) in consultation with the patient and caregiver as appropriate.

ORAL ANTICOAGULANT-THERAPYdiagnosis[SDV]Life Sciences [q-bio]Medizin030204 cardiovascular system & hematologyEmbolectomyGuidelineRECURRENT VENOUS THROMBOEMBOLISM0302 clinical medicinePregnancyDaily practiceDiagnosisPulmonary medicineVenous thrombosisPulmonary MedicineThrombolytic TherapyDEEP-VEIN THROMBOSISDisease management (health)Societies MedicalComputingMilieux_MISCELLANEOUShealth care economics and organizationsRisk assessmentddc:616RIGHT-VENTRICULAR DYSFUNCTIONDisease ManagementShockMOLECULAR-WEIGHT HEPARINThrombolysishumanities3. Good healthPulmonary embolismEuropeAnticoagulation; Biomarkers; Diagnosis; Dyspnoea; Echocardiography; Embolectomy; Guidelines; Heart failure; Pregnancy; Pulmonary embolism; Right ventricle; Risk assessment; Shock; Thrombolysis; Treatment; Venous thromboembolism; Venous thrombosismedicine.veinEchocardiographyAcute DiseaseRight ventricleMedical emergencyCardiology and Cardiovascular MedicineRisk assessmentguidelines; pulmonary embolism; venous thrombosis; shock dyspnoea; heart failure: right ventricle: diagnosis; risk assessment: echocardiography; biomarkers; treatment; anticoagulation; thrombolysis; pregnancy; venous thromboembolism; embolectomyDiagnosiVenous thromboembolismthrombolysiseducationCardiologyMEDLINEThrombolysiHeart failure610 Medicine & healthGuidelinesInferior vena cava2705 Cardiology and Cardiovascular MedicineEXTRACORPOREAL MEMBRANE-OXYGENATION03 medical and health sciencesAnticoagulationMedicalDyspnoeamedicineHumansRIGHT HEART THROMBIVENTILATION-PERFUSION SCINTIGRAPHYshock dyspnoeaHealth professionalsbusiness.industryINFERIOR VENA-CAVA10031 Clinic for Angiologyheart failure: right ventricle: diagnosisPulmonary embolismAnticoagulantsbiomarkersrisk assessment: echocardiography030229 sport sciencesBiomarkermedicine.diseaseTreatmentINHALED NITRIC-OXIDESocietiesbusinessBiomarkers
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Editor's Choice – European Society for Vascular Surgery (ESVS) 2021 Clinical Practice Guidelines on the Management of Venous Thrombosis

2021

European Society for Vascular Surgery (ESVS) 2021 Clinical Practice Guidelines on the Management of Venous Thrombosis

ORAL ANTICOAGULANT-THERAPYmedicine.medical_specialtyELASTIC COMPRESSION STOCKINGSMEDLINEED AMERICAN-COLLEGEInferior vena cavaCATHETER-DIRECTED THROMBOLYSISBlood vessel prosthesisdeep-vein-thrombosisHeparin-induced thrombocytopeniamedicineYoung adultUPPER EXTREMITY DEEPbusiness.industryINFERIOR VENA-CAVAHEPARIN-INDUCED-THROMBOCYTOPENIAsilent pulmonary-embolismMOLECULAR-WEIGHT HEPARINVascular surgerymedicine.diseaseSurgeryClinical PracticeVenous thrombosismedicine.veinSurgeryCardiology and Cardiovascular MedicinebusinessEuropean Journal of Vascular and Endovascular Surgery
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Low molecular weight heparins as antineoplastic agents.

2008

There is an increasing interest in the potential role of low molecular weight heparins (LMWHs) in the management of cancer patients. These antithrombotic agents have generated particular excitement because they have been proved useful in both the prevention and treatment of venous thromboembolism (VTE) in patients with malignancy. Recent reports are, at the same time, highlighting a potential role of LMWHs on patient survival due to their presumed antineoplastic action. This review will discuss the most recent reports and patents on these topics.

OncologyCancer Researchmedicine.medical_specialtyClinical Trials as Topicbusiness.industryCancerPatient survivalAntineoplastic AgentsGeneral MedicineHeparin Low-Molecular-WeightMalignancymedicine.diseaseSurvival RateLow molecular weight heparin cancer therapyOncologyInternal medicineNeoplasmsDrug DiscoveryAntithromboticmedicineHumansPharmacology (medical)In patientbusinessVenous thromboembolismRecent patents on anti-cancer drug discovery
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Fundamental Research in Oncology and Thrombosis 2 (FRONTLINE 2): A Follow‐Up Survey

2020

Abstract Background Fundamental Research in Oncology and Thrombosis (FRONTLINE) is a global survey of physicians' perceptions and practice in the management of venous thromboembolism (VTE) in patients with cancer. Materials and Methods The present survey, FRONTLINE 2, follows the original FRONTLINE survey (published in The Oncologist in 2003) and provides insights into how physicians perceive risk of VTE in cancer and approach its prophylaxis and treatment. Results Between November 2015 and February 2016, 5,233 respondents participated, representing cancer physicians and surgeons. Most believed that less than one in five patients with any cancer might be at risk of VTE, with a slightly high…

OncologyCancer Researchmedicine.medical_specialtymedicine.drug_classmedicine.medical_treatment26030204 cardiovascular system & hematologyFondaparinuxDabigatranVenous thromboembolism • Cancer-associated thrombosis • Deep vein thrombosis • Pulmonary embolism • Central venous catheter.03 medical and health sciences0302 clinical medicineInternal medicineSurveys and QuestionnairesVenous thromboembolism • Cancer‐associated thrombosis • Deep vein thrombosis • Pulmonary embolism • Central venous cathetermedicineHumansRivaroxabanbusiness.industryAnticoagulantWarfarinCancerAnticoagulantsThrombosisVenous ThromboembolismHeparin Low-Molecular-Weightmedicine.diseasePulmonary embolismOncologySymptom Management and Supportive Care030220 oncology & carcinogenesisbusinessCentral venous cathetermedicine.drugFollow-Up StudiesThe Oncologist
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Activity and Thermal Stability of Cobalt(II)-Based Olefin Polymerization Catalysts Adorned with Sterically Hindered Dibenzocycloheptyl Groups.

2019

Five examples of unsymmetrical 2-(2,4-bis(dibenzocycloheptyl)-6-methylphenyl- imino)ethyl)-6-(1-(arylyimino)ethyl)pyridine derivatives (aryl = 2,6-Me2C6H3 in L1

Photochemistry2Pharmaceutical Sciencechemistry.chemical_elementCatalysisArticlethermal stabilityAnalytical ChemistryPolymerizationlcsh:QD241-441chemistry.chemical_compoundDibenzocycloheptyl grouplcsh:Organic chemistryDrug DiscoveryPolymer chemistryPyridine26-bis(imino)pyridylcobalt(II) chloride precatalystsThermal stabilityPhysical and Theoretical ChemistryMolecular StructureOrganic ChemistryCobaltPolyethyleneSquare pyramidal molecular geometryLinear low-density polyethylene6-bis(imino)pyridylcobalt(II) chloride precatalystschemistryPolymerizationhigh molecular-weight saturated/unsaturated polyethyleneChemistry (miscellaneous)PolyethyleneMolecular MedicineMolar mass distributionCobaltMolecules (Basel, Switzerland)
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