Página 1 dos resultados de 1736 itens digitais encontrados em 0.004 segundos

Garlic powder and wheat bran as fillers: Their effect on the physicochemical properties of edible biocomposites

FAMA, Lucia; BITTANTE, Ana Monica B. Q.; SOBRAL, Paulo J. A.; GOYANES, Silvia; GERSCHENSON, Lia N.
Fonte: ELSEVIER SCIENCE BV Publicador: ELSEVIER SCIENCE BV
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
37.21%
Biocomposites with two different fillers, garlic and wheat bran, were studied. They were based on cassava starch and contained glycerol as a plasticizer and potassium sorbate as an antimicrobial agent and were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and infrared spectroscopy (IR). The mechanical performance at room and lower temperatures was also studied. SEM micrographies of fractured surfaces of the wheat bran composite films showed some ruptured particles of fiber while fibrils of garlic on the order of nanometers were observed when garlic composite films were studied. Mechanical tests, at room temperature, showed that the addition of wheat bran led to an increment in the storage modulus (E`) and hardening and a decrease in Tan delta, while the garlic composite showed a diminishing in the E` and hardening and did not produce significant changes in Tan delta values when compared with systems without fillers (matrix). In the range between -90 degrees C and 20 degrees C. all the materials studied presented two peaks in the Tan delta curve. In the case of the wheat bran composite, both relaxation peaks shifted slightly to higher temperatures, broadened and diminished their intensity when compared with those of the matrix; however garlic composite showed a similar behavior to the matrix. DSC thermograms of aqueous systems showed a slight shift of gelatinization temperature (T(gelatinization)) to higher values when the fillers were present. Thermograms of films showed that both...

Compósitos de matriz cerâmica contendo cargas com diferentes condutividades elétricas; Ceramic matrix composites containing fillers with different electrical conductivities

Raphael Rodrigues Lage
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 16/03/2010 PT
Relevância na Pesquisa
27.21%
Neste trabalho pretendeu-se obter compósitos de matriz cerâmica à base de oxicarbeto de silício, SiCxOy, carregados com cargas de diferentes naturezas (grafite (GCM), carbeto de silício (SCM) e siliceto de tungstênio (WCM)), de modo a explorar a influência destas cargas na condutividade das vitrocerâmicas obtidas. Os CMC foram preparados pela pirólise controlada de precursores poliméricos obtidos in situ pela reação de hidrossililação catalisada por um complexo de platina (II), do poli(metilsiloxano) (PMS) e 1,3,5,7- tetrametil-1,3,5,7-tetravinilciclotetrassiloxano (D4Vi), contendo as respectivas cargas previamente dispersas. Foi enfatizado o efeito da natureza das cargas e da matriz na composição e morfologia das fases resultantes nos materiais finais, correlacionando-as com as condutividades elétricas destes. Os compósitos obtidos e a matriz vítrea foram submetidos à caracterização estrutural por ressonância magnética nuclear de Si e C, quando possível, espectroscopia Raman e DRX. Medidas de densidade, volume de poros, e porosidade aberta também foram conduzidas. A morfologia dos materiais cerâmicos foi avaliada pela técnica de microscopia eletrônica de varredura. Por final, medidas de condutividade elétrica por meio da técnica de quatro pontas foram realizadas em todos os materiais que cumpriam os requisitos prévios para esta análise. Os compósitos SCM não apresentaram formação de novas fases...

Characterization of granite and limestone powders for use as fillers in bituminous mastics dosage

BARRA,BRENO; MOMM,LETO; GUERRERO,YADER; BERNUCCI,LIEDI
Fonte: Academia Brasileira de Ciências Publicador: Academia Brasileira de Ciências
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2014 EN
Relevância na Pesquisa
37.04%
This paper discusses the importance of studies on materials known as fillers from different mineral origins, used in asphalt mixes, specifically in the formulation of mastics. The research was carried out on samples of limestone and granite rock filler and asphalt binder (50/70). The samples were evaluated through semiquantitative chemical analyses by X-ray fluorescence, granulometry by low angle laser emission, scanning electron microscopy, softening point tests, penetration tests, and aggregate-asphalt binder and aggregate-mastic adhesion tests. The results highlighted convergent trends, indicating that the active behavior of the fillers in the mastic formulation is not related to the size of the particles, but rather to their form, surface texture, specific surface area and mineralogical nature, allowing the filler activity concept to be divided into two components: physical (hardening) and chemical (adhesion).

The effects of fillers on polyurethane resin-based electrical insulators

Altafim,Ruy Alberto Corrêa; Murakami,Cacilda Ribeiro; Claro Neto,Salvador; Araújo,Luiz Carlos Ribeiro; Chierice,Gilberto Orivaldo
Fonte: ABM, ABC, ABPol Publicador: ABM, ABC, ABPol
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2003 EN
Relevância na Pesquisa
37.04%
The increasingly widespread use of polymeric insulators in vehicle distributors and transmission systems has led to an ongoing quest for quality and low costs. This quest has, in turn, resulted in improved performance and cost benefits, brought about by the use of new polymeric and composite resins. Occasionally, however, while some properties are improved, others may show a loss of optimal performance. Therefore, to understand the behavior of fillers, such as carbon black, silica and mica added to castor oil-derived polyurethane resins, several thermal, mechanical and electrical tests were conducted on samples and insulators produced specifically for this purpose, using these new materials. The results of these tests clearly demonstrated that this type of resin and its composites can be used to manufacture indoor electrical insulators and that the fillers analyzed in this study improve or maintain the characteristics of the pure resins.

Influencia del fillers calcáreo en la solidificación/estabilización de metales pesados

Trezza,Mónica A.
Fonte: Rede Latino-Americana de Materiais Publicador: Rede Latino-Americana de Materiais
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2006 ES
Relevância na Pesquisa
36.89%
El cemento portland juega un rol cada vez más importante en el manejo de residuos industriales peligrosos. La técnica de solidificación/estabilización (S/S) basada en el cemento ha demostrado ser efectiva para el aislamiento de residuos peligrosos, especialmente metales pesados. En este trabajo se discutirá el efecto que la adición de filler calcáreo al cemento produce en la S/S de metales como cromo, cadmio y plomo. Se realizaron estudios de difracción de rayos X, espectroscopia infrarroja, calorimetría y lixiviación a fin de evaluar el nivel de inmovilización en morteros conteniendo estos elementos. Se encontró un alto grado de inmovilización de los iones Cd, Cr y Pb aunque su presencia modifica la velocidad y los compuestos obtenidos durante la hidratación del cemento. Los resultados muestran que el cemento con fillers calcáreo es más eficiente que el cemento normal para la satisfactoria inmovilización de metales pesados.

Hyaluronic acid gel fillers in the management of facial aging

Brandt, Fredric S; Cazzaniga, Alex
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.26%
Time affects facial aging by producing cellular and anatomical changes resulting in the consequential loss of soft tissue volume. With the advent of new technologies, the physician has the opportunity of addressing these changes with the utilization of dermal fillers. Hyaluronic acid (HA) dermal fillers are the most popular, non-permanent injectable materials available to physicians today for the correction of soft tissue defects of the face. This material provides an effective, non invasive, non surgical alternative for correction of the contour defects of the face due to its enormous ability to bind water and easiness of implantation. HA dermal fillers are safe and effective. The baby-boomer generation, and their desire of turning back the clock while enjoying an active lifestyle, has expanded the popularity of these fillers. In the US, there are currently eight HA dermal fillers approved for commercialization by the Food and Drug Administration (FDA). This article reviews the innate properties of FDA-approved HA fillers and provides an insight on future HA products and their utilization for the management of the aging face.

Hyaluronic acid dermal fillers: can adjunctive lidocaine improve patient satisfaction without decreasing efficacy or duration?

Smith, Lynnelle; Cockerham, Kimberly
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
Publicado em 14/03/2011 EN
Relevância na Pesquisa
27.21%
Hyaluronic acid (HA) dermal fillers are the most widely used injectables to augment facial volume without surgery. HA dermal fillers are popular because of their ease of administration, predictable effectiveness, good safety profile, and quick patient recovery. The most common patient complaint is pain. Our goal is to review the current literature on HA fillers and compare outcomes with and without lidocaine. We found adjunctive lidocaine significantly decreases pain during injection and postinjection with corresponding increased patient satisfaction. The efficacy and safety profile appears unchanged. Rare complications with HA fillers and those associated with constituents of the product, contaminants, and lidocaine are reviewed. The corrective effects of HA fillers are temporary; repeat treatment is required to maintain results. Minimizing pain is crucial to optimize patient satisfaction.

Foreign body granulomatous reactions to cosmetic fillers

Carlos-Fabuel, Laura; Marzal-Gamarra, Cristina; Martí-Álamo, Silvia; Mancheño-Franch, Aisha
Fonte: Medicina Oral S.L. Publicador: Medicina Oral S.L.
Tipo: Artigo de Revista Científica
Publicado em 01/10/2012 EN
Relevância na Pesquisa
27.21%
Introduction: The use of different facial cosmetic fillers has increased in recent years. The introduction of apparently inert substances in the epidermis can give rise to foreign body granulomatous reactions. Objetives: A literature review is made of the foreign body granulomatous reactions to cosmetic fillers. Material and Methods: A PubMed-Medline search was made using the following keywords: “granulomatous reactions”, “foreign body reactions”, “esthetic fillers”, “cosmetic fillers”. The search was limited to articles published in English and Spanish during the last 10 years. A total of 22 articles were reviewed. Results: A great variety of substances have been found to give rise to foreign body granulomatous reactions. The most common locations are the upper and lower lip and the nasogenian sulcus. The clinical presentation is variable and can range from single or multiple nodules to diffuse facial swelling of hard-elastic consistency, accompanied by reddening. Most lesions are asymptomatic or cause only mild discomfort. The literature describes different treatments, including systemic corticosteroids, local tacrolimus infiltrations, minocycline, retinoids, allopurinol, 5% imiquimod, and surgical removal. Conclusions: In view of the current demand for esthetic treatments...

Study of Tetrapodal ZnO-PDMS Composites: A Comparison of Fillers Shapes in Stiffness and Hydrophobicity Improvements

Jin, Xin; Deng, Mao; Kaps, Sören; Zhu, Xinwei; Hölken, Iris; Mess, Kristin; Adelung, Rainer; Mishra, Yogendra Kumar
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 10/09/2014 EN
Relevância na Pesquisa
27.26%
ZnO particles of different size and structures were used as fillers to modify the silicone rubber, in order to reveal the effect of the filler shape in the polymer composites. Tetrapodal shaped microparticles, short microfibers/whiskers, and nanosized spherical particles from ZnO have been used as fillers to fabricate the different ZnO-Silicone composites. The detailed microstructures of the fillers as well as synthesized composites using scanning electron microscopy have been presented here. The tensile elastic modulus and water contact angle, which are important parameters for bio-mimetic applications, of fabricated composites with different fillers have been measured and compared. Among all three types of fillers, tetrapodal shaped ZnO microparticles showed the best performance in terms of increase in hydrophobicity of material cross-section as well as the stiffness of the composites. It has been demonstrated that the tetrapodal shaped microparticles gain their advantage due to the special shape, which avoids agglomeration problems as in the case for nanoparticles, and the difficulty of achieving truly random distribution for whisker fillers.

Trends in the Use of Neurotoxins and Dermal Fillers by US Physicians

Sandoval, Laura F.; Huang, Karen E.; Davis, Scott A.; Feldman, Steven R.; Taylor, Sarah L.
Fonte: Matrix Medical Communications Publicador: Matrix Medical Communications
Tipo: Artigo de Revista Científica
Publicado em /09/2014 EN
Relevância na Pesquisa
27.21%
Background: Demand for minimally invasive cosmetic procedures have led to an increased market of available products for facial rejuvenation. Objective: To characterize trends in the usage of aesthetic products, specifically the use of botulinum toxins and dermal fillers, by United States physicians. Methods: Data from the National Ambulatory Medical Care Survey was analyzed from 1993 to 2010 to evaluate the use of dermal fillers and neurotoxins in the United States outpatient setting. The types of physician specialties administering these products and their preferences in products were characterized. Results: There were an estimated 100,000 annual cosmetic visits at which a dermal filler was administered from 1993 to 2010. From 2002 to 2010, there were 140,000 annual cosmetic visits for a dermal filler and 440,000 visits for a neurotoxin. While collagen was the most common filler used over the entire study period, its use declined eight percent annually. Hyaluronic acid fillers were preferred from 2002 to 2010, followed by calcium hydroxylapatite filler, representing 50 percent and 16.1 percent of visits, respectively. The leading neurotoxin was onabotulinumtoxin A, used at 87.1 percent of visits. Dermatologists were the leading specialty for the cosmetic use of both dermal fillers and neurotoxins. Conclusion: Providers’ preference for cosmetic products appears to be influenced by their familiarity with them...

Avaliação mecânica e microestrutural de compósitos de poliéster com adição de cargas minerais e resíduos industriais

Santos, Eylisson André dos
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Engenharia Mecânica; Tecnologia de Materiais; Projetos Mecânicos; Termociências Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Engenharia Mecânica; Tecnologia de Materiais; Projetos Mecânicos; Termociências
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
27.26%
With the current growth in consumption of industrialized products and the resulting increase in garbage production, their adequate disposal has become one of the greatest challenges of modern society. The use of industrial solid residues as fillers in composite materials is an idea that emerges aiming at investigating alternatives for reusing these residues, and, at the same time, developing materials with superior properties. In this work, the influence of the addition of sand, diatomite, and industrial residues of polyester and EVA (ethylene vinyl acetate), on the mechanical properties of polymer matrix composites, was studied. The main objective was to evaluate the mechanical properties of the materials with the addition of recycled residue fillers, and compare to those of the pure polyester resin. Composite specimens were fabricated and tested for the evaluation of the flexural properties and Charpy impact resistance. After the mechanical tests, the fracture surface of the specimens was analyzed by scanning electron microscopy (SEM). The results indicate that some of the composites with fillers presented greater Young s modulus than the pure resin; in particular composites made with sand and diatomite, where the increase in modulus was about 168 %. The composites with polyester and EVA presented Young s modulus lower than the resin. Both strength and maximum strain were reduced when fillers were added. The impact resistance was reduced in all composites with fillers when compared to the pure resin...

A study on the mechanincal properties of the combination of glass fibre and mineral fillers for reinforcing recycled low density polyethylene

Ngothai, Y.; Kit, M.; Ozbakkaloglu, T.; Seracino, R.
Fonte: Engineers Australia; CD Publicador: Engineers Australia; CD
Tipo: Conference paper
Publicado em //2008 EN
Relevância na Pesquisa
27.26%
Plastic lumber is manufactured by using thermoplastic reinforced with fillers. The disadvantages of plastic lumber compared to timber are lower stiffness and strength. To improve the mechanical properties of these products, manufacturers normally add fillers as reinforcement to the polymer matrix. In this study, the effects of combinations of glass fibre and mineral fillers, such as calcium carbonate (CaCO3) and talc on the mechanical properties of recycled low density polyethylene (LDPE) were investigated. The amount of filler was fixed at 30 wt%. The plastics and fillers were initially mixed together using a twin screw extruder and then granulated using a pelletiser. The granules were fed into an injection moulder to produce standard sized test samples. The flexural and tensile tests were performed using an INSTRON 5543 universal tester with a maximum load capacity of 1kN. The mechanical properties of the recycled LDPE were found to increase with the addition of the fillers. In particular, the addition of fillers to recycled LDPE increased its flexural strength by 40-140% and modulus by 60-250% depending on the formulation. Similarly, the tensile strength was found to increase by 20-50% and the modulus by 70- 300%. Talc-glass fibre composites exhibited higher tensile and flexural properties compared to those of CaCO3-glass fibre composites. The most crucial finding in this study is that partial substitution of 3mm glass fibre with 10% Talc T45B has shown comparable mechanical properties to the 30% 3 mm GF composites.; Ngothai Yung...

A systematic review of dermal fillers for age-related lines and wrinkles

Sturm, L.; Cooter, R.; Mutimer, K.; Graham, J.; Maddern, G.
Fonte: Blackwell Science Asia Publicador: Blackwell Science Asia
Tipo: Artigo de Revista Científica
Publicado em //2011 EN
Relevância na Pesquisa
37.41%
Background: Dermal fillers are gaining popularity for rapid aesthetic improvement. Long-term efficacy and safety have not been well documented. The aim of this systematic review was to assess the safety and efficacy of injectable dermal fillers compared with other facial augmentation techniques for the management of age-related lines and wrinkles. Methods: Studies including patients receiving injectable semi-permanent or permanent dermal fillers for age-related lines and wrinkles were included in this review. Efficacy outcomes (including changes in skin thickness and patient satisfaction) and safety outcomes (including mortality, lumps and infections) were examined. Results: Three randomized control trials and six case series were included. Permanent and semi-permanent dermal fillers improved subjective ratings of appearance and resulted in higher patient satisfaction than temporary fillers. Long-term efficacy appeared good in the few studies that reported it. Short-term safety appeared favourable. Lumps were reported in all but one study but received little follow-up. Long-term safety data were limited. Conclusions: The treatment of age-related lines and wrinkles with permanent and semi-permanent dermal fillers is more efficacious compared with temporary fillers in those studies that compared them. Case series evidence suggests that these fillers achieve their objective...

冻融循环对轻质填料抗压强度的影响; Influence of freeze-thaw cycles on compression strength characteristics of WFS-FA-EPS beads lightweight fillers

Deng, A.; Yu, Y.
Fonte: Tongji Daxue * Cailiao Kexue yu Gongcheng Xueyuan Publicador: Tongji Daxue * Cailiao Kexue yu Gongcheng Xueyuan
Tipo: Artigo de Revista Científica
Publicado em //2009 ZH
Relevância na Pesquisa
27.21%
A lightweight fillers studied include waste foundry sand, fly ash, expandable polystyrene (EPS) beads. Utilization of lightweight fillers as industrial solid wastes is not only beneficial to environment protection, but also takes advantages of low density, thermal insulation and anti-freeze/thaw behavior that the fillers possess, which put the materials favorably applicable to various backfilling infrastructure works at cold regions. Unconfined compressive strength tests were conducted on 13 sets of samples with different mix proportions that were subjected to changeable freeze-thaw cycles. The purpose is to analyze the compressive strength and deformation characteristics of the lightweight fillers under freeze-thaw conditions. It is found that materials maintain acceptable mechanical behavior after subject to freeze-thaw cycles. Mixture components play different roles in affecting the strength characteristics of materials. Cement component clearly enhances anti-freeze capability of the materials. Components of EPS and fly ash may improve the freeze-thaw resistance of the materials. Water is the main source causing freeze-thaw failure. Therefore, it is suggested that water content be prudentially controlled as long as adequate water supply for cement hydration is provided. The mechanism of materials' freeze/thaw resistance is also discussed. = 通过对不同配合比的13组试样在不同冻融循环次数下的无侧限抗压强度试验...

Produção de óleos e fillers proteicos a partir da raspa tripa da indústria de curtumes

Bragança, Idalina
Fonte: Instituto Politécnico do Porto Publicador: Instituto Politécnico do Porto
Tipo: Dissertação de Mestrado
Publicado em //2010 POR
Relevância na Pesquisa
37.04%
A indústria de curtumes é fortemente geradora de resíduos sólidos e águas residuais pelo que a necessidade de criar alternativas para a sua valorização e minimização é premente e constante. Este trabalho teve, como principal objectivo, o aproveitamento da raspa tripa, resíduo da indústria de curtumes. Para tal, a raspa tripa foi sujeita a um processo de hidrólise térmica e/ou enzimática para obtenção de gordura e hidrolisado proteico. Na hidrólise da raspa tripa foi estudada a influência de vários factores como a quantidade de enzima e de água, a temperatura e o tempo. Constatou-se que foi para a temperatura de 60ºC, um tempo de quatro horas, uma quantidade de 2% de enzima e 100% de água, relativamente à massa de raspa utilizada, que se obteve o melhor resultado com um rendimento de extracção de 93%. A partir da gordura obtida foram produzidos óleos por sulfatação e sulfitação, designados por óleos sulfatados e sulfitados, respectivamente. O hidrolisado proteico obtido foi concentrado por evaporação para aumentar o seu teor de sólidos totais. Com este foram produzidos gluproteicos e fillers, por acção de glutaraldeído e do efeito sinérgico de outros produtos. Os óleos, o hidrolisado concentrado e seus derivados foram testados no processo de engorduramento e recurtume do couro. A avaliação dos resultados foi realizada por comparação dos resultados dos testes físico-mecânicos das amostras de pele obtidas com valores de referência e por comparação com um ensaio padrão em que se utilizaram produtos de referência do mercado. Os resultados foram muitos satisfatórios visto que foram superiores aos valores de referência e também superiores aos valores obtidos para o padrão salvo raras excepções. Reconheceu-se assim a aplicabilidade destes produtos no processo de recurtume e engorduramento que também corresponderam no que respeita a características importantes do couro como a firmeza de flor e o toque. No decorrer do trabalho constatou-se que as peles tratadas com hidrolisado proteico apresentavam uma cor mais intensa...

Dermal Fillers: Do's and Dont's

Vedamurthy, Maya; Vedamurthy, Amar; Nischal, KC
Fonte: Medknow Publications Publicador: Medknow Publications
Tipo: Artigo de Revista Científica
Publicado em //2010 EN
Relevância na Pesquisa
27.21%
Dermal fillers are an important tool in the armamentarium of an aesthetic dermatologist in the management of ageing skin. A surge in the use of fillers has been witnessed due to increasing awareness among people, easy availability of fillers and increased enthusiasm amongst the dermatologists and plastic surgeons to use this modality. In this era of evidence-based medicine and litigations against doctors, Dermatologists should be vigilant about different acts of omission and commission in the use of fillers. This article briefly discusses the dos and don'ts with respect to dermal fillers.

The use of polyimide-modified aluminum nitride fillers in AlN@PI/Epoxy composites with enhanced thermal conductivity for electronic encapsulation

Zhou, Yongcun; Yao, Yagang; Chen, Chia-Yun; Moon, Kyoungsik; Wang, Hong; Wong, Ching-ping
Fonte: Nature Publishing Group Publicador: Nature Publishing Group
Tipo: Artigo de Revista Científica
Publicado em 24/04/2014 EN
Relevância na Pesquisa
27.26%
Polymer modified fillers in composites has attracted the attention of numerous researchers. These fillers are composed of core-shell structures that exhibit enhanced physical and chemical properties that are associated with shell surface control and encapsulated core materials. In this study, we have described an apt method to prepare polyimide (PI)-modified aluminum nitride (AlN) fillers, AlN@PI. These fillers are used for electronic encapsulation in high performance polymer composites. Compared with that of untreated AlN composite, these AlN@PI/epoxy composites exhibit better thermal and dielectric properties. At 40 wt% of filler loading, the highest thermal conductivity of AlN@PI/epoxy composite reached 2.03 W/mK. In this way, the thermal conductivity is approximately enhanced by 10.6 times than that of the used epoxy matrix. The experimental results exhibiting the thermal conductivity of AlN@PI/epoxy composites were in good agreement with the values calculated from the parallel conduction model. This research work describes an effective pathway that modifies the surface of fillers with polymer coating. Furthermore, this novel technique improves the thermal and dielectric properties of fillers and these can be used extensively for electronic packaging applications.

Ultrasound detection and identification of cosmetic fillers in the skin

Cárdenas, G.; Wortsman, J.; Orlandi, C.; Sazunic, I.; Jemec, G. B. E; Wortsman, X.
Fonte: WILEY-BLACKWELL Publicador: WILEY-BLACKWELL
Tipo: Artículo de revista
EN
Relevância na Pesquisa
27.21%
Artículo de publicación ISI; Background While the incidence of cosmetic filler injections is rising world-wide, neither exact details of the procedure nor the agent used are always reported or remembered by the patients. Thus, although complications are reportedly rare, availability of a precise diagnostic tool to detect cutaneous filler deposits could help clarify the association between the procedure and the underlying pathology. Objectives The aim of this study was to evaluate cutaneous sonography in the detection and identification of cosmetic fillers deposits and, describe dermatological abnormalities found associated with the presence of those agents. Methods We used ultrasound in a porcine skin model to determine the sonographic characteristics of commonly available filler agents, and subsequently applied the analysis to detect and identify cosmetic fillers among patients referred for skin disorders. Results Fillers are recognizable on ultrasound and generate different patterns of echogenicity and posterior acoustic artefacts. Cosmetic fillers were identified in 118 dermatological patients; most commonly hyaluronic acid among degradable agents and silicone oil among non-degradable. Fillers deposits were loosely scattered throughout the subcutaneous tissue...

Synergic effect of two inorganic fillers on the mechanical and thermal Properties of hybrid polypropylene composites

Quijada, Raúl; Toro, Patricio; Yazdani-Pedram, Mehrdad; López Manchado, Miguel Angel; Aguilar, Héctor
Fonte: Universidade do Chile Publicador: Universidade do Chile
Tipo: Artículo de revista
EN
Relevância na Pesquisa
37.04%
Artículo de publicación Scielo; Inorganic fillers such as CaCO3 and clays are widely used as fillers to improve the mechanical and physical properties of polypropylene (PP). With the aim of improving simultaneously the stiffness and yield stress of PP, hybrid nanocomposites comprising PP/CaCO3/clay (montmorillonite) were prepared and their thermal and mechanical properties were investigated and compared with those of PP/CaCO3 and PP/clay composites. Morphological characterizations of the composites were performed by SEM and XRD analyses. The results showed exfoliated clay in the hybrid composite with a much higher degree than in PP/ clay composite. Increase in modulus and yield stress and better thermal stability was attained for hybrid composites as a result of the clay exfoliation. The toughening effect of two different types of CaCO3 particles was also observed in hybrid composites, where an effective enhancement of the mechanical and thermal properties were achieved depending on the origin, specific area, particle and pore size of the CaCO3 used.; Financial support of Conicyt through Project FONDECYT 1131139 is acknowledged. H. Aguilar is thankful to the Conicyt for a doctorate scholarship.

Magnetically-Functionalized Self-Aligning Graphene Fillers for High-Efficiency Thermal Management Applications

Renteria, J.; Legedza, S.; Salgado, R.; Balandin, M. P.; Ramirez, S.; Saadah, M.; Kargar, F.; Balandin, A. A.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 27/08/2015
Relevância na Pesquisa
27.3%
We report on heat conduction properties of thermal interface materials with self-aligning "magnetic grapheme" fillers. Graphene enhanced nano-composites were synthesized by an inexpensive and scalable technique based on liquid-phase exfoliation. Functionalization of graphene and few-layer-graphene flakes with Fe3O4 nanoparticles allowed us to align the fillers in an external magnetic field during dispersion of the thermal paste to the connecting surfaces. The filler alignment results in a strong increase of the apparent thermal conductivity and thermal diffusivity through the layer of nano-composite inserted between two metallic surfaces. The self-aligning "magnetic grapheme" fillers improve heat conduction in composites with both curing and non-curing matrix materials. The thermal conductivity enhancement with the oriented fillers is a factor of two larger than that with the random fillers even at the low ~1 wt. % of graphene loading. The real-life testing with computer chips demonstrated the temperature rise decrease by as much as 10oC with use of the non-curing thermal interface material with ~1 wt. % of the oriented fillers. Our proof-of-concept experiments suggest that the thermal interface materials with functionalized graphene and few-layer-graphene fillers...