carnauba wax
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Author(s):  
Banu Iyisan ◽  
Johanna Simon ◽  
Yuri Avlasevich ◽  
Stanislav Baluschev ◽  
Volker Mailaender ◽  
...  

LWT ◽  
2022 ◽  
pp. 113108
Author(s):  
Dhruv Thakur ◽  
Anurag Singh ◽  
Pramod Kumar Prabhakar ◽  
Murlidhar Meghwal ◽  
Ashutosh Upadhyay
Keyword(s):  

Author(s):  
Eli José Miranda Ribeiro Junio ◽  
Joy Ruby Violet Stephen ◽  
Murugan Muthuvel ◽  
Amitava Roy ◽  
Patrícia de Araújo Rodrigue ◽  
...  

Author(s):  
S.Ya. Brichka

Latent thermal energy storage using phase change materials has attracted interest in the use of solar and other types of energy due to their ability to provide high density lateral energy storage. Materials with a latent heat of storage have become attractive for their use in many branches of human activity. However, the materials use is often limited by problems of low thermal conductivity, the transition from a solid to a molten state causes difficulties in storing materials in a container, and special heat exchangers are needed to increase the energy cost. The solution to the above problems may be to create solid-state, form-stable heat storage elements. In this work, a number of shape-stable materials with a phase transition were obtained from melts by mixing halloysite nanotubes with carnauba wax in order to improve the heat accumulation characteristics. Halloysite nanotubes were mixed at elevated temperatures with carnauba melted wax and rapidly cooled to prevent the nanotubes sedimentation. As a result, a series of solid wax/nanotube samples were prepared with weight ratios of 70/30, 60/40 and 50/50. Pure wax showed a accumulation heat of the solid-to-liquid phase transition of 189.09 J/g. Carnauba wax has a latent heat greater by about 25 % compared to paraffin. Composite materials had significantly lower latent heat, respectively, 99.39 J/g for 70/30, 90.25 J/g for 60/40, and 81.26 J/g for 50/50 samples. Elemental mapping of the nanomaterial revealed a nanotubes uniform distribution in the wax. According to the data of X-ray analysis, as a result of the composite materials preparation, the components did not form new crystalline phases, but they were physical mixtures. When heated, the components did not chemically interact with each other, which is useful for the accumulation of thermal energy by materials. Analysis of the IR spectra of the samples confirmed the change in the absorption bands of functional hydroxyl groups at 3696 sm–1 (Al–O–H) and 3621 sm–1 (Si–O–H). In primary nanotubes, the intensities ratio of silanol to aluminol groups is greater than unity, while in the composite it is already less than this value. This manifestation can be explained by the fact that, during the wax melting, the interaction of wax molecules on the outer surface of the nanotubes occurs. Bibl. 16, Fig. 5.


2021 ◽  
Vol 19 (11) ◽  
pp. 1875-1882
Author(s):  
Raphael Nobrega ◽  
Edson Costa ◽  
Andre Germano ◽  
Italo Medeiros

2021 ◽  
pp. 215-224
Author(s):  
G.C. Pestana ◽  
K.A.F. dos Santos ◽  
M. Miranda ◽  
P.C. Spricigo ◽  
M.C. Mitsuyuki ◽  
...  

Author(s):  
E.Veena Rani

The aim of the present study is to prepare sintered gastroretentive tablets of Pioglitazone and to study the effect of sintering on invitro dissolution study, hardness and friability. Sintering is defined as the process of compaction or formation of compact at a temperature below the melting point of solid constituent for the purpose of increasing its strength by bonding the particles together. EVA 1802, stearic acid, carnauba wax, and natural polymers like almond gum, xanthun gum, guar gum were used. The tablets were prepared by direct compression and wet granulation technique using PVP as binder and EVA, carnauba wax, stearic acid in different concentration of 10%, 15% were used in preparation. The prepared tablets were subjected to sintering at three different temperatures of 50, 60, 70°C for three different time periods of 1hr, 2hr, 3hrs in hot air oven. Precompression and post compression parameters were performed. Results showed that the release rate of the drug was inversely related to the sintering temperature and time of sintering. The optimum drug retardation occurred in the tablets at 70°C for 3hrs. increasing the temperature and time of exposure to a particular temperature often decreases the release rate of the drug. In addition, the hardness of the sintered tablets was increased with increasing sintering temperature and duration of sintering whereas friability of tablets was found to be decreased with increasing time. The optimized formulations F3(SA+CW+XG), F4(SA+CW+EVA) sintered at 70°C for 3hrs showed the maximum release of 70-80%. from the kinetic profile it shows that the drug release followed zero order and nonfickian diffusion mechanism. Thus, the formulations F3 and F4 was considered to be the best formulations among all the 6 formulations sintered at various temperature and various time periods. Hence it shows the suitability of EVA,SA,CW, natural polymers for preparing the sintered gastroretentive tablets of Pioglitazone.


Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1351
Author(s):  
Kyungwon Moon ◽  
Kyeong-Ok Choi ◽  
Sungmin Jeong ◽  
Young-Wan Kim ◽  
Suyong Lee

Canola oil was structured into oleogels with different amounts of carnauba wax, and their processing performances were assessed as an alternative to solid fat for imitation cheese low in saturated fat. The contents of solid fat in the oleogels were less vulnerable to the change in temperature than the palm oil. The replacement of palm oil with oleogels produced cheese samples with harder and more cohesive/chewy textures. Dynamic and transient viscoelastic measurements demonstrated that the use of oleogels was effective in increasing the elastic nature of the cheeses. Two distinct components with different proton mobilities were observed in the imitation cheeses, and longer T2 relaxation times were detected in the oleogel samples. The meltability of the cheese with palm oil was not significantly different from those with 3% and 6% oleogels. The saturated fat level of the oleogel cheese was significantly reduced from 45.70 to 5.20%. The application of canola oil-carnauba wax oleogels could successfully produce imitation cheese high in unsaturated fat and low in saturated fat. This study thus demonstrated that the health-functional properties of imitation cheese could be enhanced by using oleogels.


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