Base de dados : MEDLINE Pesquisa : D27.720.066 [Categoria DeCS] Referências encontradas : 8 [refinar] Mostrando: 1 .. 8   no formato [Detalhado]

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MEDLINE

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[PMID]: 24367993 [Au] Autor: Yu D; Cai JY; Church JS; Wang L [Ad] Endereço: CSIRO Materials Science and Engineering , P.O. Box 21, Belmont, Victoria 3216, Australia. [Ti] Título: Modifying surface resistivity and liquid moisture management property of keratin fibers through thiol-ene click reactions. [So] Source: ACS Appl Mater Interfaces;6(2):1236-42, 2014 Jan 22. [Is] ISSN: 1944-8252 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: This paper reports on a new method for improving the antistatic and liquid moisture management properties of keratinous materials. The method involves the generation of thiols by controlled reduction of cystine disulfide bonds in keratin with tris(2-carboxyethyl) phosphine hydrochloride and subsequent grafting of hydrophilic groups onto the reduced keratin by reaction with an acrylate sulfonate or acrylamide sulfonate through thiol-ene click chemistry. The modified substrates were characterized with Raman spectroscopy and scanning electron microscopy and evaluated for their performance changes in liquid moisture management, surface resistivity, and wet burst strength. The results have revealed that the thiol-acrylate reaction is more efficient than the thiol-acrylamide reaction, and the keratinous substrate modified with an acrylate sulfonate salt exhibits significantly improved antistatic and liquid moisture management properties. [Mh] Termos MeSH primário: Química Click Tecido Elástico/química Queratinas/química [Mh] Termos MeSH secundário: Acrilatos/química Substâncias Antieletricidade Estática/química Interações Hidrofóbicas e Hidrofílicas Microscopia Eletrônica de Varredura Compostos de Sulfidrila/química Propriedades de Superfície [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T [Nm] Nome de substância: 0 (Acrylates); 0 (Antistatic Agents); 0 (Sulfhydryl Compounds); 68238-35-7 (Keratins); J94PBK7X8S (acrylic acid) [Em] Mês de entrada: 1409 [Cu] Atualização por classe: 140122 [Lr] Data última revisão: 140122 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 131226 [St] Status: MEDLINE [do] DOI: 10.1021/am405060x

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MEDLINE

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[PMID]: 24052302 [Au] Autor: Baytekin HT; Baytekin B; Hermans TM; Kowalczyk B; Grzybowski BA [Ad] Endereço: Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA. [Ti] Título: Control of surface charges by radicals as a principle of antistatic polymers protecting electronic circuitry. [So] Source: Science;341(6152):1368-71, 2013 Sep 20. [Is] ISSN: 1095-9203 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Even minute quantities of electric charge accumulating on polymer surfaces can cause shocks, explosions, and multibillion-dollar losses to electronic circuitry. This paper demonstrates that to remove static electricity, it is not at all necessary to "target" the charges themselves. Instead, the way to discharge a polymer is to remove radicals from its surface. These radicals colocalize with and stabilize the charges; when they are scavenged, the surfaces discharge rapidly. This radical-charge interplay allows for controlling static electricity by doping common polymers with small amounts of radical-scavenging molecules, including the familiar vitamin E. The effectiveness of this approach is demonstrated by rendering common polymers dust-mitigating and also by using them as coatings that prevent the failure of electronic circuitry. [Mh] Termos MeSH primário: Substâncias Antieletricidade Estática/química Materiais Revestidos Biocompatíveis/química Depuradores de Radicais Livres/química Polímeros/química Eletricidade Estática/efeitos adversos Vitamina E/química [Mh] Termos MeSH secundário: Dimetilpolisiloxanos/química Poeira/prevenção & controle Equipamentos e Provisões Elétricas Poliestirenos/química [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S. [Nm] Nome de substância: 0 (Antistatic Agents); 0 (Coated Materials, Biocompatible); 0 (Dimethylpolysiloxanes); 0 (Dust); 0 (Free Radical Scavengers); 0 (Polymers); 0 (Polystyrenes); 1406-18-4 (Vitamin E); 63148-62-9 (baysilon) [Em] Mês de entrada: 1310 [Cu] Atualização por classe: 130920 [Lr] Data última revisão: 130920 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 130921 [St] Status: MEDLINE [do] DOI: 10.1126/science.1241326

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MEDLINE

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[PMID]: 24750909 [Au] Autor: Youssef AM; El-Samahy MA; Abdel Rehim MH [Ad] Endereço: Packing and Packaging Materials Department, National Research Center, Cairo, Egypt. [Ti] Título: Preparation of conductive paper composites based on natural cellulosic fibers for packaging applications. [So] Source: Carbohydr Polym;89(4):1027-32, 2012 Aug 01. [Is] ISSN: 1879-1344 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: Conducting paper based on natural cellulosic fibers and conductive polymers was prepared using unbleached bagasse and/or rice straw fibers (as cellulosic raw materials) and polyaniline (PANi) as conducting polymer. These composites were synthesized by in situ emulsion polymerization using ammonium persulfate (APS) as oxidant in the presence of dodecylbenzene sulfonic acid (DBSA) as emulsifier. The prepared composites were characterized using Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimeter (DSC), and their morphology was investigated using scanning electron microscope (SEM). Electrical conductivity measurements showed that the conductivity of the paper sheets increases by increasing the ratio of PANi in the composite. Mechanical properties of the paper sheets were also investigated, the results revealed that the values of breaking length, burst factor, and tear factor are decreased with increasing ratio of added PANi, and this effect is more pronounced in bagasse-based composites. The new conductive composites can have potential use as anti-static packaging material or anti-bacterial paper for packaging applications. [Mh] Termos MeSH primário: Antibacterianos/química Substâncias Antieletricidade Estática/química Celulose/química Oryza/química Papel [Mh] Termos MeSH secundário: Sulfato de Amônio/química Benzenossulfonatos/química [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Anti-Bacterial Agents); 0 (Antistatic Agents); 0 (Benzenesulfonates); 22QF6L357F (ammonium peroxydisulfate); 60NSK897G9 (dodecylbenzenesulfonic acid); 9004-34-6 (Cellulose); 9006-97-7 (bagasse); SU46BAM238 (Ammonium Sulfate) [Em] Mês de entrada: 1510 [Cu] Atualização por classe: 151119 [Lr] Data última revisão: 151119 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 140423 [St] Status: MEDLINE [do] DOI: 10.1016/j.carbpol.2012.03.044

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MEDLINE

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[PMID]: 21156104 [Au] Autor: Gawish SM; Avci H; Ramadan AM; Mosleh S; Monticello R; Breidt F; Kotek R [Ad] Endereço: National Research Center, Textile Research Division, Dokki, Cairo, Egypt. [Ti] Título: Properties of antibacterial polypropylene/nanometal composite fibers. [So] Source: J Biomater Sci Polym Ed;23(1-4):43-61, 2012. [Is] ISSN: 1568-5624 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: Melt spinning of polypropylene fibers containing silver and zinc nanoparticles was investigated. The nanometals were generally uniformly dispersed in polypropylene, but aggregation of these materials was observed on fiber surface and in fiber cross-sections. The mechanical properties of the resulted composite fibers with low concentration of nanometal were comparable to those for the control PP yarns. Extruded composite fibers that contained 0.72% silver and 0.60% zinc nanoparticles had outstanding antibacterial efficacy as documented by the percentage count reduction growth of Escherichia coli and Staphylococcus aureus. Fibers containing silver particles had improved antistatic properties. [Mh] Termos MeSH primário: Antibacterianos/química Antibacterianos/farmacologia Nanopartículas Metálicas/química Nanocompostos/química Polipropilenos/química Prata/química Zinco/química [Mh] Termos MeSH secundário: Substâncias Antieletricidade Estática/química Substâncias Antieletricidade Estática/farmacologia Escherichia coli/efeitos dos fármacos Escherichia coli/crescimento & desenvolvimento Fenômenos Mecânicos Staphylococcus aureus/efeitos dos fármacos Staphylococcus aureus/crescimento & desenvolvimento Propriedades de Superfície Temperatura Ambiente [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Anti-Bacterial Agents); 0 (Antistatic Agents); 0 (Polypropylenes); 3M4G523W1G (Silver); J41CSQ7QDS (Zinc) [Em] Mês de entrada: 1203 [Cu] Atualização por classe: 161125 [Lr] Data última revisão: 161125 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 101216 [St] Status: MEDLINE [do] DOI: 10.1163/092050610X541944

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MEDLINE

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[PMID]: 21861076 [Au] Autor: Sun J; Wang Y; Qian Z; Hu C [Ad] Endereço: Key Lab of Biorheological Science and Technology, College of Bioengineering, Ministry of Education, Research Center of Bioinspired Material Science and Engineering, Chongqing University, Chongqing 400030, China. [Ti] Título: An approach to architecture 3D scaffold with interconnective microchannel networks inducing angiogenesis for tissue engineering. [So] Source: J Mater Sci Mater Med;22(11):2565-71, 2011 Nov. [Is] ISSN: 1573-4838 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: The angiogenesis of 3D scaffold is one of the major current limitations in clinical practice tissue engineering. The new strategy of construction 3D scaffold with microchannel circulation network may improve angiogenesis. In this study, 3D poly(D: ,L: -lactic acid) scaffolds with controllable microchannel structures were fabricated using sacrificial sugar structures. Melt drawing sugar-fiber network produced by a modified filament spiral winding method was used to form the microchannel with adjustable diameters and porosity. This fabrication process was rapid, inexpensive, and highly scalable. The porosity, microchannel diameter, interconnectivity and surface topographies of the scaffold were characterized by scanning electron microscopy. Mechanical properties were evaluated by compression tests. The mean porosity values of the scaffolds were in the 65-78% and the scaffold exhibited microchannel structure with diameter in the 100-200 µm range. The results showed that the scaffolds exhibited an adequate porosity, interconnective microchannel network, and mechanical properties. The cell culture studies with endothelial cells (ECs) demonstrated that the scaffold allowed cells to proliferate and penetrate into the volume of the entire scaffold. Overall, these findings suggest that the fabrication process offers significant advantages and flexibility in generating a variety of non-cytotoxic tissue engineering scaffolds with controllable distributions of porosity and physical properties that could provide the necessary physical cues for ECs and further improve angiogenesis for tissue engineering. [Mh] Termos MeSH primário: Neovascularização Fisiológica/fisiologia Engenharia Tecidual/métodos Tecidos Suporte [Mh] Termos MeSH secundário: Substâncias Antieletricidade Estática Materiais Biocompatíveis Células Cultivadas Células Endoteliais Seres Humanos Microscopia Eletrônica de Varredura Propriedades de Superfície [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T [Nm] Nome de substância: 0 (Antistatic Agents); 0 (Biocompatible Materials) [Em] Mês de entrada: 1203 [Cu] Atualização por classe: 171021 [Lr] Data última revisão: 171021 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 110824 [St] Status: MEDLINE [do] DOI: 10.1007/s10856-011-4426-0

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[PMID]: 20940049 [Au] Autor: Witzleb R; Kanikanti VR; Hamann HJ; Kleinebudde P [Ad] Endereço: Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine-University, Duesseldorf, Germany. [Ti] Título: Solid lipid extrusion with small die diameters--electrostatic charging, taste masking and continuous production. [So] Source: Eur J Pharm Biopharm;77(1):170-7, 2011 Jan. [Is] ISSN: 1873-3441 [Cp] País de publicação: Netherlands [La] Idioma: eng [Ab] Resumo: The aim of this work was to develop a continuous solid lipid extrusion process that includes post-process milling of the extrudates. Die diameters smaller than 0.5 mm should be used for taste masking of the bitter tasting anthelmintic praziquantel. During lipid extrusion with small die diameters, electrostatic charging of the extrudates occurred. This could be avoided by adding liquid polyethylene glycol (PEG) as antistatic agent. Further, extrusion with PEG as antistatic agent was possible with small diameter down to 0.2 mm and with up to 80% praziquantel load. Dissolution of praziquantel extrudates was shown to be faster with smaller extrudate diameter due to surface enlargement. Anyhow, different praziquantel extrudates with small diameter, drug load up to 70% and PEG content up to 20%, were proven to be sufficiently taste masked in a randomised palatability study with 40 cats. Within a scale-up experiment, lipid extrusion and milling of the extrudates in a centrifugal mill afterwards were conducted continuously. Extrudates from continuous and batchwise production revealed small differences in terms of size distribution and surface habit, but were similar in drug dissolution rate. [Mh] Termos MeSH primário: Anti-Helmínticos/química Substâncias Antieletricidade Estática/química Aromatizantes/química Excipientes Farmacêuticos/química Praziquantel/química [Mh] Termos MeSH secundário: Administração Oral Animais Anti-Helmínticos/efeitos adversos Comportamento Animal/efeitos dos fármacos Gatos Composição de Medicamentos/instrumentação Composição de Medicamentos/métodos Ingestão de Alimentos/efeitos dos fármacos Aromatizantes/administração & dosagem Umidade Excipientes Farmacêuticos/administração & dosagem Polietilenoglicóis/administração & dosagem Polietilenoglicóis/química Pós Praziquantel/efeitos adversos Controle de Qualidade Distribuição Aleatória Solubilidade Eletricidade Estática Paladar Triglicerídeos/química [Pt] Tipo de publicação: COMPARATIVE STUDY; JOURNAL ARTICLE [Nm] Nome de substância: 0 (Anthelmintics); 0 (Antistatic Agents); 0 (Flavoring Agents); 0 (Pharmaceutic Aids); 0 (Powders); 0 (Triglycerides); 30IQX730WE (Polyethylene Glycols); 6490C9U457 (Praziquantel); D133ZRF50U (tripalmitin) [Em] Mês de entrada: 1105 [Cu] Atualização por classe: 151119 [Lr] Data última revisão: 151119 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 101014 [St] Status: MEDLINE [do] DOI: 10.1016/j.ejpb.2010.10.002

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[PMID]: 20557697 [Au] Autor: Oh SH; Park SC; Kim HK; Koh YJ; Lee JH; Lee MC; Lee JH [Ad] Endereço: a Department of Advanced Materials, Hannam University, 461-6 Jeonmin Dong, Yuseong Gu, Daejeon 305-811, South Korea. [Ti] Título: Degradation Behavior of 3D Porous Polydioxanone-b-Polycaprolactone Scaffolds Fabricated Using the Melt-Molding Particulate-Leaching Method. [So] Source: J Biomater Sci Polym Ed;22(1-3):225-37, 2011. [Is] ISSN: 1568-5624 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: Recently, polydioxanone (PDO) and polycaprolactone (PCL) have been applied in applications for tissue engineering owing to their flexibility, as well as biocompatibility and biodegradability, even though their degradation rates are usually either too fast or too slow for many applications. In this study, we synthesized poly(dioxanone-b-caprolactone) co-polymers (PDOCLs) with different DO/CL ratio (0:10-10:0) by ring-opening polymerization. The synthesized co-polymers were characterized by (1)H-NMR, the measurement of inherent viscosity (IV), GPC and DSC. PDOCL scaffolds with different DO/CL ratio were fabricated by a melt-molding particulate-leaching method without using any organic solvents during the scaffold fabrication process. The degradation behavior (in vitro) of the PDOCL scaffolds was evaluated in PBS at 37°C for up to 56 days by the changes in molecular weight, mechanical strength, gross weight and pH. It was observed that the degradation rate of PDOCL scaffolds could be controlled by adjusting the DO/CL ratio of the co-polymers (increasing CL composition leads to slower degradation rate). The PDOCL scaffolds did not lead to a significant drop in pH during the degradation, not even for the PDO-dominant PDOCL scaffolds showing a fast degradation rate, indicating the formation of a small amount of acidic by-products compared to the PLGA scaffolds. From the results, it was expected that the PDOCLs can be a new flexible scaffolding material with different degradation rate for various tissue-engineering applications. [Mh] Termos MeSH primário: Polidioxanona/química Poliésteres/química Tecidos Suporte/química [Mh] Termos MeSH secundário: Implantes Absorvíveis Substâncias Antieletricidade Estática Varredura Diferencial de Calorimetria Concentração de Íons de Hidrogênio Microscopia Eletrônica de Varredura Porosidade Espectroscopia de Prótons por Ressonância Magnética Temperatura Ambiente Fatores de Tempo Engenharia Tecidual/métodos Viscosidade [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T [Nm] Nome de substância: 0 (Antistatic Agents); 0 (Polyesters); 24980-41-4 (polycaprolactone); 31621-87-1 (Polydioxanone) [Em] Mês de entrada: 1605 [Cu] Atualização por classe: 150828 [Lr] Data última revisão: 150828 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 100619 [St] Status: MEDLINE [do] DOI: 10.1163/092050609X12597621891620

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[PMID]: 19127530 [Au] Autor: Saraiva SA; Abdelnur PV; Catharino RR; Nunes G; Eberlin MN [Ad] Endereço: ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas, UNICAMP, Campinas, SP, 13083-970, Brazil. [Ti] Título: Fabric softeners: nearly instantaneous characterization and quality control of cationic surfactants by easy ambient sonic-spray ionization mass spectrometry. [So] Source: Rapid Commun Mass Spectrom;23(3):357-62, 2009 Feb. [Is] ISSN: 0951-4198 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: A tiny droplet of typical samples of fabric softeners from different commercial brands placed on a smooth paper surface was subjected to easy ambient sonic-spray ionization mass spectrometry (EASI-MS). With no need for sample-preparation or pre-separation procedures, EASI-MS and EASI-MS/MS identify nearly instantaneously the main surfactants and the homologous series employed in their formulations. Adulterated and low quality samples containing no or less efficient softeners are also easily recognized. [Mh] Termos MeSH primário: Substâncias Antieletricidade Estática/análise Espectrometria de Massas/métodos Tensoativos/análise [Mh] Termos MeSH secundário: Cátions Dimetilaminas/análise Modelos Químicos Compostos Orgânicos/química Compostos Orgânicos/normas Controle de Qualidade Compostos de Amônio Quaternário/análise Eletricidade Estática Tensoativos/química [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Antistatic Agents); 0 (Cations); 0 (Dimethylamines); 0 (Organic Chemicals); 0 (Quaternary Ammonium Compounds); 0 (Surface-Active Agents); 0 (fabric softeners) [Em] Mês de entrada: 0903 [Cu] Atualização por classe: 090113 [Lr] Data última revisão: 090113 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 090108 [St] Status: MEDLINE [do] DOI: 10.1002/rcm.3878

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