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Статті в журналах з теми "Microcapsule en suspension"
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Xiao, Ke Feng, Zhi Hui Hao, Lei Lei Wang, and Xiu Guang Feng. "Optimization of Formulations of 1% Abamectin Microcapsule Suspensions with Properties of Biochemical Materials." Advanced Materials Research 643 (January 2013): 17–20. http://dx.doi.org/10.4028/www.scientific.net/amr.643.17.
Повний текст джерелаАнотація:
By orthogonal experiments, optimal formulation of 1% abamectin microcapsule suspensions was determined as follow: the proportion of abamectin microcapsule is 1%, NNO 5.0%, sodium dodecyl sulfate 3.0%, xanthan gum 0.3%, ethylene glycol 3%, and the remainder is water. The indicators of the formulation are all excellent: good dispersibility, suspension rate greater than 90%, cold storage and hot storage syneresis rates under 5%. The properties of biochemical materials were used in optimization. The optimal formulation provides an experimental basis for industrial production of abamectin microcapsule suspensions.
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Маляр, И. В., О. И. Гуслякова, Д. М. Митин та С. В. Стецюра. "Управляемая электрическим полем адсорбция микрокапсул при создании планарных структур". Письма в журнал технической физики 44, № 4 (2018): 9. http://dx.doi.org/10.21883/pjtf.2018.04.45633.17039.
Повний текст джерелаАнотація:
AbstractIt is found that an electric field applied parallel to a substrate surface influences the adsorption of positively charged core–shell microcapsules on glass substrates. As a result, the amount of microcapsules adsorbed near negative contact is up to 2 times larger than the one absorbed near positive contact. It is also found that small concentration (less than 0.2 M) of salt in microcapsule suspension decreases this effect, while an increase in the concentration to 0.45 M results in enhancement of the effect.
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Sugita, Purwantiningsih, Suminar Setiati Achmadi, and Yuyu Yundhana. "Perilaku Disolusi Ketoprofen Tersalut Gel Kitosan-Karboksimetilselulosa (CMC)." Jurnal Natur Indonesia 13, no. 1 (November 21, 2012): 21. http://dx.doi.org/10.31258/jnat.13.1.21-26.
Повний текст джерелаАнотація:
Study dissolution behaviour of ketoprofen through optimum chitosan-CMC microcapsule has been carried out. Into228.6 ml of 1.0% (w/v) chitosan solution in 1% (v/v) acetic acid, 38.1 ml of CMC solution was added with concentrationvariation of 0.075; 0.0875; and 0.10% (w/v). Afterwards, 7.62 mL of glu was added slowly under stirring, withconcentrations varied: 3; 4.5; and 6% (v/v). All mixtures were shaked for 20 minutes for homogenization. Into eachmicrocapsule mixture for ketoprofen, a solution of 2 g of ketoprofen in 250 mL of 96% ethanol was added. Everymixture was then added with 5 ml of 2% Tween-80 and stirred with magnetic stirrer for an hour at room temperature.Conversion of suspension into fine powders/granules (microcapsules) was done by using spray dryer. Thedissolution behaviour of optimum ketoprofen microcapsules were investigated in gastric and intestinal medium.Microcapsule morphology before and after dissolution as well as empty microcapsule (blank) were observed withSEM. Spray drying process had successfully coated ketoprofen in chitosan-CMC microcapsule. Optimization byusing Minitab Release 14 software showed that among the microcapsule compositions studied, CMC and glu of0.0925% (w/v) and 3.01% (v/v), respectively, optimum to coat ketoprofen at constant chitosan concentration 1.0%(w/v). Result of SEM morphology and In vitro dissolution profile showed that ketoprofen in chitosan-CMCmicrocapsule was relatively well than chitosan-guar gum microcapsule. Kinetically, dissolution of ketoprofen frommicrocapsule in intestinal pH condition was first order with release rate constant, k, of 7.285 10-4 % min-1 andrelease half-time, t1/2, of approximately 15 hours.
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Sugita, Purwantiningsih, Bambang Srijanto, Budi Arifin, and Ellin Vina Setyowati. "STABILITY OF KETOPROFEN COATED BY CHITOSAN-GUAR GUM GEL." Indonesian Journal of Chemistry 9, no. 3 (June 24, 2010): 391–97. http://dx.doi.org/10.22146/ijc.21504.
Повний текст джерелаАнотація:
The coating stability of ketoprofen by chitosan-guar gum gel has been studied. Into 228.6 mL of 1.75% (w/v) chitosan solution in 1% (v/v) acetic acid, 38.1 mL of guar gum (gg) solution was added with concentration variation of 0.35, 0.55, and 0.75% (w/v) for ketoprofen microcapsules, and stirred with magnetic stirrer until homogenous. Afterwards, 7.62 mL of glutaraldehyde (glu) was added slowly under stirring, with concentrations varied: 3, 3.5, and 4% (v/v). All mixtures were shaked for 20 min for homogenization. Into each microcapsule mixture for ketoprofen, a solution of 2 g of ketoprofen in 250 mL of 96% ethanol was added. Every mixture was then added with 5 mL of 2% Tween-80 and stirred with magnetic stirrer for an hour at room temperature. Conversion of suspension into fine powders/granules (microcapsules) was done by using spray dryer. Every microcapsule formula was packed into capsules, as much as 100 g per capsule. The capsules were contained in 100-mL dark bottles and the bottles were kept in climatic chamber at (40 ± 2) °C and RH (75 ± 5) % for 3 months. The microcapsule stabilities were tested chemically and physically. The result showed that formulation of ketoprofen preparation composed of 1.75% (w/v) chitosan, 0.35% (w/v) gg, and 3.50% (v/v) glu, was relatively the best, with ketoprofen percentage left in microcapsule after 3 months, degradation rate constant, and shelf life of 80.33%, 0.0351 % week-1, and 18.92 months, respectively. Reaction kinetic model for this formula followed Prout-Tompkins equation and the degradation of ketoprofen was seem to follow autocatalytic reaction mechanism controlled by the formation and growth of reaction core. Keywords: Ketoprofen, chitosan-guar gum gel
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Zheng, Yu, Xiaoming Li, Wenjie Zhang, Kuan Wang, Feng Han, Xiaoge Li, and Yuqiang Zhao. "Experimental Study of Phase Change Microcapsule Suspensions Applied in BIPV Construction." Sustainability 14, no. 17 (August 30, 2022): 10819. http://dx.doi.org/10.3390/su141710819.
Повний текст джерелаАнотація:
In this paper, a phase change microcapsule suspension MPCMS25 with a mass fraction of 10% was prepared with TH-ME25 as the phase change microcapsule particles and deionized water as the base fluid. The experimental benches of the Building Integrated Photovoltaic (BIPV) system and BIPV-MPCMS system were set up, and the comparative tests were carried out in Nanjing to study the optimization effect of phase change microcapsule suspension on the thermal and electrical properties of the BIPV system. The results show that MPCMS25 reduces the component temperature of the system by 8.8 °C and the backplane temperature by 11.1 °C. The optimization time of the component operating temperature and the backplane temperature is 9.5 h and 9.75 h, respectively. Delay appearance of peak module operating temperature by 114 min and peak backplane temperature by 125 min. In addition, the suspension can also improve the power conversion efficiency (PCE) of photovoltaic modules by 0~5%. After a simulation study on the energy consumption of a high-speed railway station, it is found that using the BIPV-MPCMS system as the building envelope can achieve an energy saving rate of about 8.5%.
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Ootaki, Y., K. Kamohara, D. J. Horvath, A. Massiello, L. A. R. Golding, B. Lukic, W. J. Weiss, O. Maruyama, and K. Fukamachi. "Hemolysis Evaluation of Centrifugal Pumps Using Microcapsule Suspension." International Journal of Artificial Organs 29, no. 12 (December 2006): 1185–89. http://dx.doi.org/10.1177/039139880602901212.
Повний текст джерела
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Lu, Juan, Danhua Zhu, and Lanjuan Li. "Evaluation of hydromechanical and functional properties of diversion-type microcapsule-suspension bioreactor for bioartificial liver." International Journal of Artificial Organs 45, no. 3 (January 16, 2022): 309–21. http://dx.doi.org/10.1177/03913988211066502.
Повний текст джерелаАнотація:
Aim: To evaluate the performance of a diversion-type microcapsulesuspension fluidized bed bioreactor and a choanoid fluidized bed bioreactor as bioartificial liver support systems. Materials and methods: We evaluated the performance between the modified fluidized bed bioreactor based on diversion-type microcapsule suspension (DMFBB) and choanoid fluidized bed bioreactor (CFBB). The fluidization performance, fluidized height, bed expansion, and the mechanical stability and strength of microcapsule were determined. The viability, synthetic, metabolism, and apoptosis of microcapsulated HepLi5 cells were evaluated. Finally, samples were collected for measurement of alanine aminotransferase, total bilirubin, direct bilirubin, and albumin concentrations. Results: Uniform fluidization was established in both DMFBB and CFBB. The bed expansion, shear force, retention rate, swelling rate, and breakage rate of microcapsules differed significantly between two bioreactors over 3 days. The viability of microencapsulated HepLi5 cells and the activities of cytochrome P450 1A2 and 3A4 increased on each day in DMFBB compared to the control. The albumin and urea concentrations in the DMFBB displayed obvious improvements compared to the control. Caspase3/7 activities in the DMFBB decreased compared to those in the CFBB. At 24 h, the alanine aminotransferase concentration in the DMFBB declined significantly compared to the control. The total and direct bilirubin concentrations within plasma perfusion were decreased and albumin was increased in the DMFBB at 24 h than in the CFBB. Conclusion: The DMFBB shows a promising alternative bioreactor for use in bioartificial liver support systems for application of clinical practice.
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MARUYAMA, Osamu, Takashi YAMANE, Masahiro NISHIDA, Tatsuo TSUTSUI, Tomoaki JIKUYA, and Toru Masuzawa. "Microcapsule Suspension for Hemolysis Evaluation of Centrifugal Blood Pumps." Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2002.14 (2002): 195–96. http://dx.doi.org/10.1299/jsmebio.2002.14.195.
Повний текст джерела
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Samran, Samran, Dalimunthe Dalimunthe, Dalimunthe Dalimunthe, and Dalimunthe Dalimunthe. "THE FORMULATION OF DRY CURCUMA (CURCUMA XANTHORRHIZA ROXB.) EXTRACT MICROCAPSULES BY SPRAY WET MICROENCAPSULATION TECHNIQUES." Asian Journal of Pharmaceutical and Clinical Research 11, no. 3 (March 1, 2018): 226. http://dx.doi.org/10.22159/ajpcr.2018.v11i3.22608.
Повний текст джерелаАнотація:
Objective: Curcuma xanthorrhiza Roxb. was used as hereditary medicinal plant for prevention of liver dysfunction, gastrointestinal disease, fever, and hemorrhoid. Curcuma extract was easy to damage because the light exposure, change of pH, weather and a long period of storage time. The problem can be solved by coating the extract with spray wet microencapsulation (SWM) technique. SWM technique is a method of preparing microcapsules in which a solution, suspension, or emulsion with a charged matrix is sprayed into opposing solution. The aim of this research was to formulate the dry Curcuma extract with SWM technique using sodium alginate as matrix.Methods: Brown algae (Sargassum ilicifolium) was a main resource of alginate acid. It was isolated using HCl 5% to make alginate acid and sodium alginate that was obtained by adding Na2CO3 5% to alginate acid solution. The microencapsulation process of Curcuma extract was done by SWM technique. The formula of Curcuma extract microencapsulation was design into three formulas: F1, F2, and F3. Microcapsules of Curcuma extract were being characterized for color intensity, analysis of scanning electron microscope (SEM), compressibility index, flowing time, and determination of angle repose.Results: The results showed that the higher concentration of sodium alginate used, the dry Curcuma extract microcapsules produced better. Particle size of extract microcapsules of Curcuma extract microcapsules SEM from F1, F2, F3 was 20 μm whereas dry weight of extracted microcapsule of Curcuma grows with increasing concentration of sodium alginate: F1 (0.2%) 19.86±0.11 g, F2 (0.4%) 20.66±0.73, F3 (0.6%) 21.29±0.64. The flowing time of F1, F2, and F3 was 6.92±0.56, 7.42±0.50, and 8.05±0.54 s consecutively.Conclusions: Based on the analysis of the study result, it can be concluded that the raw materials of Curcuma extract can be made by SWM technique using sodium alginate isolated from brown algae, and the characterization of dry Curcuma extract microcapsule of the three formulas met the requirements of the pre-formulation tests for capsule dosage form.
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Kim, Sunyoung, Bo-Hyun Kim, Myongkeon Oh, Dong Hyuk Park, and Sunjong Lee. "Repeatable Crack Self-Healing by Photochemical [2 + 2] Cycloaddition of TCE-co-DCE Monomers Enclosed in Homopolymer Microcapsules." Polymers 11, no. 1 (January 9, 2019): 104. http://dx.doi.org/10.3390/polym11010104.
Повний текст джерелаАнотація:
Self-healing, an autonomous repairing process stimulated by damage, has recently attracted a great deal of attention in the field of medical and mechanical engineering as well as from scientists, due to its valuable potential applications. However, as the self-healing process is mediated by specific functional materials, practical applications have been limited. Here, we introduce a healable homopolymer microcapsule that can self-heal a crack or cleaved part through a photochemical [2 + 2] cycloaddition process. Microcapsules were prepared through photopolymerization and suspension polymerization, each containing 1,1,1-tris (cinnamoyloxymethyl) ethane (TCE) and 1,1-di (cinnamoyloxymethyl) ethane (DCE) monomers, which act as healing materials. TCE and DCE monomers were polymerized into poly (TCE-co-DCE) without a photoinitiator under illumination. The epoxy specimen embedded with microcapsules showed obvious healing performance during illumination after cracking. From the FT-IR spectra for each step of the healing process, the specimen could be repeatedly self-healed through the reversible process of cyclobutane cross-links to the original cinnamate and vice versa. This work shows an alternative approach using homopolymer microcapsules to accomplish the repeatable self-healing of a crack without interface discontinuity, which could be adopted as a healing substance in various paints.
Дисертації з теми "Microcapsule en suspension"
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Boubehziz, Toufik. "Simulation en quasi temps réel d’une capsule sous écoulement grâce à des Modèles d’Ordre Réduit." Thesis, Compiègne, 2022. http://www.theses.fr/2022COMP2678.
Повний текст джерелаАнотація:
La déformation d’une capsule en écoulement dans un canal micro-fluidique est un problème compliqué à simuler numériquement. Nous proposons deux modèles innovants de pilotage de données d’ordre réduit pour simuler le problème spatio-temporel à partir d’une base de données collectée des simulations réalisées avec un modèle d’ordre élevé. L’objectif est de remplacer le modèle numérique haute-fidélité existant par un modèle d’ordre réduit capable de simuler l’évolution de déformation des capsules en écoulement à faible cout en temps et en calcul. Le premier modèle consiste à construire à partir d’un cube de données espace-temps-paramètre un modèle réduit pour simuler la déformation de la microcapsule pour n’importe quelle configuration admissible de paramètres. La prédiction de l’évolution temporelle de la capsule pour une configuration donnée de paramètres et un pas de discrétisation temporelle choisi se fait à l’aide d’un apprentissage sur des variétés du modèle réduit. Le deuxième modèle se base sur l’idée de réécrire le problème sous forme d’un système dynamique d’ordre réduit dans lequel les coefficients spectraux des déplacements et les champs des vitesses sont relies à travers d’un opérateur dynamique à identifier. Pour déterminer ce dernier, nous suggérons l’utilisation d’une approche de décomposition en modes dynamiques. Des validations numériques confirment la fiabilité et stabilité des deux nouveaux modèles par rapport au modèle d’ordre élevé. Une application informatique est également mise au point afin d’explorer l’évolution de déformation des capsules pour toute configuration de paramètres admissiblesThe motion of a liquid-filled microcapsule flowing in a microchannel is a complex problem tosimulate. Two innovative reduced-order data-driven models are proposed to replace the Fluid Structure Interaction (FSI) model using a collected database from high-fidelity simulations. The objective is to replace the existing Full Order Model (FOM) with a fast-simulation model that can simulate the capsule deformation in flow at a low cost in terms of time and calculation. The first model consists in building from a space-time-parameter datacube a reduced model to simulate the deformation of the microcapsule for any admissible configuration of parameters. Time evolution of the capsule deformation is treated by identifying the nonlinear low-order manifold of the reduced variables. Then, manifold learning is applied using the Diffuse Approximation (DA) method to predict capsule deformation for a query configuration of parameters and a chosen time discretization. The second model is based on rewriting the FSI model under the form of a reduced-order dynamic system. In this latter, the spectral displacement and velocity coefficients are related through a dynamic operator to be identified. To determine this operator, we suggest the use of a dynamic mode decomposition approach. Numerical validations prove the reliability and stability of the two new models compared to the high order model. A software application has been developed to explore the capsule deformation evolution for any couple of admissible parameters
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JUNIOR, JOSE RONALDO VIMIEIRO. "THREE-DIMENSIONAL VISUALIZATION OF OIL DISPLACEMENT BY FLEXIBLE MICROCAPSULES SUSPENSIONS IN POROUS MEDIA." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31834@1.
Повний текст джерелаАнотація:
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Em um mundo globalizado, a demanda por energia está sempre crescendo. Uma vez que a indústria de óleo e gás é responsável pela entrega da maior parte desta demanda, isso faz dos hidrocarbonetos componentes cada vez mais importantes no mercado mundial. Entretanto tais recursos são finitos, portanto, uma exploração consciente, buscando sempre o máximo desempenho se faz necessária. Como os reservatórios de petróleo, logo após a aplicação das técnicas de recuperação primária e secundária, geralmente ainda possuem cerca de 65 por cento do volume de óleo originalmente contido em seus poros, métodos que visam a redução dessa porcentagem estão ganhando um papel cada vez mais importante na indústria energética. Nesse contexto, esse trabalho apresenta um micromodelo tridimensional representativo de um meio poroso que será utilizado para a análise do escoamento de fluidos na escala de poro. A microscopia confocal será adotada para visualizar os diferentes fenômenos que ocorrem em microescala, permitindo a obtenção de informações específicas sobre a dinâmica dos gânglios de óleo, em relação a sua formação, mobilização e aprisionamento, e assim, ao final do experimento quantificar a saturação residual de óleo em diferentes condições de escoamento. Os resultados obtidos mostram que o uso das suspensões de microcápsulas flexíveis como agente de controle de mobilidade, modifica a distribuição dos fluidos no meio poroso, o que melhora a eficiência de deslocamento do fluido deslocante na escala de poro, e consequentemente diminui a saturação de óleo residual.
In a globalized world, the demand for energy is always growing. Since the oil and gas industry is responsible for delivering most of this demand, this makes hydrocarbon components increasingly important in the worldwide economy. However, such resources are finite, so a conscious exploration always seeking the maximum performance is required. As oil reservoirs after the application of primary and secondary recovery techniques usually still have about 65 percent of the original oil volume contained in their pores, methods that aim its reduction are gaining an increasingly important role in the energy industry. In this context, this work presents a three-dimensional micromodel representative of a porous medium that is used for pore-scale flow analysis. Confocal microscopy is used to visualize the microscale phenomena, leading to specific information about ganglia dynamics, related to its formation, mobilization and entrapment. The residual oil saturation, an important value to measure the amount of oil produced in a given reservoir is determined for different flow conditions. The results show that the suspensions composed by flexible microcapsules could be used as a mobility control agent, since it modifies the fluid distribution in the porous media, improving the pore-scale displacement efficiency, and consequently reducing the residual oil saturation.
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Machado, Jaison Carlosso. "Desenvolvimento e controle de qualidade de micropartículas poliméricas contendo praziquantel para o tratamento pediátrico da esquistossomose." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/181180.
Повний текст джерелаАнотація:
A esquistossomose é uma doença parasitária aguda e crônica causada por vermes sanguíneos (vermes nematoides) do gênero Schistosoma. O homem contrai a esquistossomose através da penetração ativa da cercaria na pele. A importância do tratamento desta enfermidade consiste não só no fato de curar a doença ou diminuir a carga parasitária dos pacientes, bem como impedir sua evolução para formas mais graves. Para o tratamento da esquistossomose o fármaco de escolha é o praziquantel; isso se deve ao seu amplo espectro, sua eficácia, segurança e a relação custo/tratamento. A única forma farmacêutica disponível no Brasil é o comprimido, na dose de 600 mg, a qual pode ser subdividida em quatro partes de 150 mg, a fim de facilitar o ajuste de dose. No entanto, no momento da subdivisão dos comprimidos ocorre o rompimento do revestimento. Este fato acaba levando a uma exposição do fármaco e, consequentemente, de seu sabor amargo. Esta característica dificulta a administração do medicamento, principalmente na população infantil, prejudicando o tratamento e o controle da doença. Uma alternativa para este problema é o desenvolvimento de sistemas poliméricos microparticulados que associados ao fármaco impediriam o contato direto com as papilas gustativas e assim promoveriam uma melhoria na palatabilidade. Para isso utilizou-se a técnica modificada de deposição interfacial do polímero pré-formado seguido de secagem por aspersão. Três matrizes poliméricas, com diferentes características de liberação foram utilizadas, Eudragit RL 100 – liberação tempo dependente e Eudragit E100 e L30D-55 – liberação pH dependente. Além disso, dois tipos de sistemas carreadores do fármaco foram preparados, microcápsulas e microesferas poliméricas. Estes sistemas obtidos foram avaliados e caracterizados a fim de eleger a melhor proposta de formulação visando o mascaramento do sabor do fármaco. De acordo com os resultados obtidos selecionou-se um sistema composto por microcápsulas formadas a partir do polímero L30D-55. A partir de então inseriu-se este sistema na forma farmacêutica pó para suspensão oral, onde diferentes propostas de formulações, contendo dois edulcorantes auxiliares, aspartame e sacarina, separadamente, e seus respectivos placebos foram avaliadas através de um método in vitro para a determinação do sabor, a língua eletrônica ou sensor gustativo. As diferentes formulações avaliadas apresentaram capacidade em mascarar o sabor desagradável do fármaco e, assim resultam em uma promissora alternativa para o aumento da adesão por parte dos pacientes à terapêutica, principalmente para crianças, em virtude da facilidade de administração, do ajuste da dose em função da massa corpórea e ao sabor muito mais agradável ao paladar infantil.Schistosomiasis is a parasitic disease acute and chronic caused by blood worms (nematodes worms) of the genus Schistosoma. Man acquires schistosomiasis through the active penetration of the worms in skin. The importance of treatment of this disease is not only the fact of curing the disease or decreases the parasite load of patients, well as prevent progression to more severe forms. For the treatment of schistosomiasis praziquantel is the drug of choice, this is due to its wide spectrum, its efficacy, safety and the relation cost / treatment. The single dosage form available in Brazil is tablet at a dose of 600 mg, which can be subdivided into four parts of 150 mg to facilitate dose adjustment. However when the subdivision of the tablets occurs the disruption of the coating. This fact provides a drug exposure and consequently of its bitter taste. This characteristic complicates the administration of the drug mainly in children, affecting the treatment and control of disease. An alternative for this problem is the development of microparticulate polymeric systems which associated with the drug would prevent direct contact with the taste buds and thus promote an improvement in palatability. For this was used a modified technique interfacial deposition of preformed polymer followed by spray drying. Three polymer matrices with different release characteristics have been used, Eudragit RL 100 – time dependent release, and Eudragit E100 and L30D-55 – pH dependent release. Furthermore, two types of drug carrier systems have been prepared, polymeric microspheres and microcapsules. These systems obtained were evaluated and characterized in order to select the best proposal formulation aimed at masking the taste of the drug. According to the results we selected a system comprising microcapsules formed from L30D-55 polymer. From then was inserted into this system in the pharmaceutical form, powder for oral suspension, where different proposals formulations containing two auxiliary sweeteners, aspartame and saccharin, separately, and their respective placebos were evaluated in an in vitro method for determining the taste, the electronic tongue. The different formulations tested presented excellent ability to mask the unpleasant taste of the drug and thus present an excellent alternative for increasing adherence to therapy, especially for children, because of the ease of administration, according on dose adjustment of body mass and the much more palatable to children's taste.
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Yang, Wen-hsin, and 楊雯欣. "Preparation of Phase Change Materials Microcapsules by Suspension Polymerization." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/44704131551489191321.
Повний текст джерелаАнотація:
碩士國立中央大學
化學工程與材料工程研究所
95
Encapsulation of phase change materials (PCM), n-octadecane melted at 28 oC, by using acrylic series networks as the shell materials have been developed. The effects of the various process parameters including the concentration of initiator, the concentration of EGDMA, the polymerization temperature, the reaction time, the weight ratio of core/shell, the weight fraction of MAA, the weight fraction of MA, the weight fraction of SiO2 and the different pH of water were investigated. The influence of above parameters on diameters, morphologies, thermal energy storage/release capacities and thermal stabilities of the microcapsules were characterized by scanning electron microscope (SEM), differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). The results showed that the diameters of PCMs microcapsules were in the range of 0.5-3.0 μm. Latent heat of PCM microcapsules were above 90 J/g. The best core/shell weight ratio was 1/1. The efficiency of encapsulation was improved by increasing initiator concentration, polymerization temperature, reaction time in higher temperature and EGDMA concentration. In addition, the efficiency of encapsulation was also promoted by introducing the suitable amount of MAA, MA and TEOS in the system.
Частини книг з теми "Microcapsule en suspension"
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Pečar, Borut, Slavko Amon, Matej Možek, and Dejan Križaj. "Impedance Spectroscopy of Suspensions with Paraffin Microcapsules." In IFMBE Proceedings, 1254–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23508-5_324.
Повний текст джерелаТези доповідей конференцій з теми "Microcapsule en suspension"
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Cha, J. M., D. G. Won, E. H. Jeong, T. Arakawa, S. Shoji, K. C. Kim, J. S. Boo, and J. S. Go. "Application of In-Channel Micro Chemical Plant to the Production of Functional Microcapsules." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41795.
Повний текст джерелаАнотація:
Polymeric microcapsules can be fabricated by using kernel process called “micro chemical plant system”. The size of microcapsules is more uniform than those made in the conventional pathways. Spherical microcapsules are fabricated through the innovative conjunction of the well-defined amphiphilic block copolymer and stable microfluidic procedure. Crossed microchannel chemical plant are fabricated by using double deep reactive ion etch (DRIE) on 400 μm-thick silicon wafer. The width and depth of this are 100 μm, respectively. PS-b-PMMA copolymer is synthesized by atomic transfer radical polymerization (ATRP) and molecular weight and poly dispersity index (PDI) is 9837 g/mol and 1.08, respectively. With the introduction of two immiscible fluids into the microchannel, droplet flows are visualized by using a high speed CCD camera. The microcapsule was formed due to supramolecular self-assembly of copolymer in the droplet. The characteristics of the produced microcapsules were measured by SEM. A new microfilter was also introduced to separate microcapsule from the suspension fluid.
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Chalhub O. S. Ribeiro, Raphael. "3D Visualization of Oil Displacement in Porous Media by the Injection of Microcapsule Suspension using Confocal Microscopy." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/204265-stu.
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Molino, Jay J., Hirofumi Daiguji, and Fumio Takemura. "On the Kinetics of Formation of Hollow Poly(Lactic Acid) Microcapsules Fabricated From Microbubble Templates." In ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73257.
Повний текст джерелаАнотація:
Biodegradable hollow poly-lactic acid (PLA) microcapsules were synthesized by directly adsorbing the polymer to N2 (air) microbubbles using the bubble template method. In this method microbubbles nucleate inside droplets, made of a solution of PLA in dichloromethane, as a result of solvent diffusion into a continuous phase of either water or a PVA aqueous solution. Subsequently PLA adsorbs to the microbubble surface, covers it and then the microbubble covered with PLA is spontaneously released from the drople’s interior yielding to hollow PLA microcapsules. For special fabrication conditions, it was found that the final capsules were uniform in size. It was found that the high uniformity is directly correlated to the type of release. This was classified into either single or multiple bubble release. When the predominant type of release is single bubble release, the resultant microcapsules were uniform. In this study we also aim to elucidate the conditions required to attain single bubble release. It is believed that this type of release is attained when the energy barrier at the liquid-liquid interface is lowered, thus microcapsules can be smoothly released. From experiments, it was understood that the use of PVA, a low molecular weight PLA and an initially low PLA concentration is the requirement in order to attain single bubble release. Furthermore, based on rheological and the surface tension measurements at the liquid-liquid interface and inner flow circulation inside the droplet we proposed two plausible mechanisms for single bubble release: (a) mechanism based on the repulsive force between two adjacent microbubbles and (b) mechanism based on the imbalance of interfacial tensions around a bubble. SEM images revealed that microcapsules obtained from ‘multiple bubble’ type can display a non-spherical cores. In addition, these capsules can have briged shells or bridged cores (share cores). Microcapsule bridging can happen inside the droplet (when cores are shared) or outside (when only the shell is bridged). Increasing the initial concentration of PLA or using a PLA of high molecular weight yields to this phenomenon. The zeta potential of these capsules at pH = 7.0 was above 20mV, and thus the colloidal suspension of microcapsules in water was stable.
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Farid, Mohammed, Michael Smith, Rami Sabbah, and Said Al Hallaj. "Miniaturized Refrigeration System With Advanced PCM Micro Encapsulation Technology." In ASME 2007 5th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2007. http://dx.doi.org/10.1115/icnmm2007-30209.
Повний текст джерелаАнотація:
Technology advances in microchips and miniaturized refrigeration systems require heat to be removed at a high flux. Microchannel heat exchangers have been implemented for the efficient removal of heat in these applications. However, the maximum achievable heat flux is still limited even when two-phase flow (evaporation) is used, due to the formation of vapor film along the wall of the heat exchanger. In this presentation, the principle of using a suspension of microcapsules in liquid as a heat transfer fluid to improve the performance of microchannel heat exchangers will be discussed. The microcapsules contain phase change material, which melts and solidifies at a specified range of temperatures. These microcapsules improve the fluid effective specific heat capacity and thermal conductivity due to latent heat effect and micro mixing respectively.
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Ermakov, A. V., M. V. Lomova, V. P. Kim, A. S. Chumakov, I. A. Gorbachev, D. A. Gorin, and E. G. Glukhovskoy. "Processes in suspensions of nanocomposite microcapsules exposed to external electric fields." In Saratov Fall Meeting 2015, edited by Elina A. Genina, Valery V. Tuchin, Vladimir L. Derbov, Dmitry E. Postnov, Igor V. Meglinski, Kirill V. Larin, and Alexander B. Pravdin. SPIE, 2016. http://dx.doi.org/10.1117/12.2229569.
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Ru Qiao, Xiao Li Zhang, Yan Li, Ri Qiu, and Young Soo Kang. "Fabrication of functional microcapsules containing two-phase suspensions for microparticle-based displays." In 2006 IEEE Nanotechnology Materials and Devices Conference. IEEE, 2006. http://dx.doi.org/10.1109/nmdc.2006.4388952.
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CARVALHO, Marcio, Debora Freitas do Nascimento, and Jose Ronaldo Vimieiro Junior. "Three-dimensional Visualization of Oil Displacement by Flexible Microcapsules Suspensions in Porous Media." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-0989.
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Alvarado, Jorge L., Charles Marsh, Curt Thies, Guillermo Soriano, and Paritosh Garg. "Characterization of Thermal Properties and Heat Transfer Behavior of Microencapsulated Phase Change Material Slurry and Multiwall Carbon Nanotubes in Aqueous Suspension." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41954.
Повний текст джерелаАнотація:
In the last decade, microencapsulated phase change material (MPCM) slurries have been proposed and studied as novel coolants for heat transfer applications. Such applications include electronics cooling, and secondary coolants in air conditioning systems among others. Experiments have shown that MPCM’s increase the overall thermal capacity of thermal systems by taking advantage of the phase change material’s latent heat of fusion. However, research has also shown that the overall heat transfer coefficient is diminished due to a reduction in the effective thermal conductivity and increased viscosity of the slurry. For this reason, there is an urgent need to modify the content of microcapsules containing phase change material to increase their effective thermal conductivity and the overall heat transport process. Our solution consists of increasing the thermal conductivity of MPCM by adding carbon nanotubes to the shell and core of the microcapsules. Carbon nanotubes have shown to increase the thermal conductivity of liquids by 40% or more in recent experiments. In this paper, MPCM slurry containing octadecane as phase change material and multi-wall carbon nanotubes (MWCNTs) embedded in the capsule material and core are compared with pure water as heat transfer fluid. Thermal and physical properties of MPCM slurry containing carbon nanotubes were determined using a differential scanning calorimeter and concentric viscometer, respectively. Experimental convective heat transfer coefficient data for MWCNT aqueous suspensions under laminar flow and constant heat flux were determined using a bench-top heat transfer loop. Experimental heat transfer results are presented.