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Hydrothermal synthesis of silver nanoparticles in arabic gum aqueous solutions

Transactions of Nonferrous Metals Society of China 2015年第6期25卷 2081-2086页

作者：黎应芬甘卫平周健鲁志强杨超戈田田中南大学材料科学与工程学院长沙410083

Finely divided silver nanoparticles were synthesized via the hydrothermal method. arabic gum （AG） was used as both the reductant and steric stabilizer without any other surfactant. By adjusting the reaction temperature, mass ratio of AG to AgNO3, and reaction time, silver nanoparticles with different morphological characteristics could be obtained. The products were characterized by UV-Vis, FTIR, TEM, SEM, and XRD measurements. It was found that temperature and AG played an important role in the synthesis of mono-disperse silver nanoparticles. Well dispersed and quasispherical silver nanoparticles were obtained under the optimal synthesis conditions of 10 mmol/L AgNO3, m（AG）/m（AgN03）= l：1, 160 ℃ and 3 h.

关键词： silver nanoparticles hydrothermal method arabic gum green chemistry

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Microencapsulation of Lipase and Savinase Enzymes by Spray Drying Using arabic gum as Wall Material

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Journal of Encapsulation and Adsorption Sciences 2016年第4期6卷 161-173页

作者： Torres Andrea Ferrándiz Marcela Capablanca Lucía Franco Esther Mira Elena Moldovan Simona Biotechnology Research Group Textile Research Institute (AITEX) Alcoy Spain

Enzymes have been used in detergents over the years. They can improve the detergent’s efficiency due to their activities against hard stains. Nevertheless, enzymes cannot maintain their properties indefinitely, since they are exposed to stress factors, like temperature, pH, mechanical processes and others. Consequently, enzymes lose their structure and they are not functional. For this reason, microencapsulating these proteins is a feasible solution to improve their use in industrial processes and commercial products. Spray drying technology has been selected because a lot of scientific literature proved its useful application in a variety of industries. In particular, savinase and lipase are the two encapsulated enzymes in this work. Savinase attacks proteins and lipase removes fats, so they are suitable enzymes for detergent industry. arabic gum has been used as wall material. Morphology, size and activity of the obtained microcapsules have been analyzed in order to find the best conditions to produce them. In conclusion, useful microcapsules of lipase and savinase can be obtained with the mentioned technology.

关键词： Savinase Lipase arabic gum Spray Drying Microencapsulation

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Protective effects of two food hydrocolloids on dental erosion:Nanomechanical properties and microtribological behavior study

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Friction 2021年第2期9卷 356-366页

作者： Heng XIAO Liang ZHENG Wei HAN Rui WU Jing ZHENG Zhongrong ZHOU Tribology Research Institute Key Laboratory of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong UniversityChengdu 610031China Institute of Oceanographic Instrumentation Shandong Provincial Key Laboratory of Marine Monitoring Instrument and Equipment TechnologyQilu University of Technology(Shandong Academy of Sciences)Qingdao 266061China

In this study,the protective effects of two food hydrocolloids,Xanthan gum and arabic gum,on dental erosion are investigated from the perspective of the nanomechanical properties and microtribological behavior of acid-eroded *** specimens prepared from extracted human teeth were immersed in citric acid solution(CAS),CAS with 0.03%w/v Xanthan gum and CAS with 0.03%w/v arabic gum,respectively,for 10 min to obtain three groups of eroded *** nanomechanical properties and microtribological behavior of enamel were examined using nano-indentation/scratch *** results show that compared with arabic gum,Xanthan gum inhibits enamel surface demineralization and acid permeation more effectively because of a more uniform and denser adsorption on the surface of the *** impairment of the nanomechanical and microtribological properties of the enamel surface by acid erosion is mitigated more significantly by adding trace amounts of Xanthan gum than arabic *** summary,adding trace food hydrocolloids reduces enamel surface demineralization and inhibits acid permeation to mitigate the influence of erosion on the mechanical and tribological properties of *** adsorption state of food hydrocolloids is the determining factor in the permeability of acid agents into the enamel and plays a significant role in preventing dental erosion.

关键词： dental erosion Xanthan gum arabic gum nanomechanical properties microtribological behavior

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Computational and experimental study on corrosion inhibition potential of the synergistic 1:1 combination of arabic and cashew gums on mild steel

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Petroleum Research 2020年第2期5卷 170-180页

作者： David Ebuka Arthur Department of Chemistry Base UniversityAbujaNigeria

The synergistic study of Acacia Senegal (arabic gum) and Anacardium occidentale (cashew gum) combination in corrosion inhibition of mild steel was carried out to determine the inhibition efficiency of their combination. The gums were purified using standard methods and the blend prepared using the method as described by Femi – Oyewo et al. The blend was then used for corrosion study at two temperatures (303 K and 333 K) and the corrosion rates calculated. The adsorption process was found to satisfy the Langmuir isotherm and hence the sorption study reveals that the interaction is a physical one since the free energy of adsorption (ΔG^(o) ads kJ/mol) is given as (−16.47 and −15.61) kJ/mol at temperature T = 303 K and 333K accordingly. The GCMS technique was used to characterize the blend, five chemical compounds and their area percentage [6-O-(1-L-maloyl)-alpha-,beta-D-Glcp (veracylglucan A) (22.11%), 6-Octadecanoic acid (55.76%), Methylhexadecanoate (3.97%), 1-Pentadecane carboxylic acid (10.78%) and 9, 12-Octadecadienoic acid (7.38%)] were identified and subjected to computation corrosion study, the binding energy for the constituents of the blend on Fe surface were computed using Accelrys Material Studio and the mean values were found to be −327.097 kJ/mol, −446.943 kJ/mol, −602.826 kJ/mol, −608.625 kJ/mol and −693.749 kJ/mol respectively.

关键词： arabic gum Cashew gum Synergy DFT Corrosion

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Preparation of ultrafine silver powders with controllable size and morphology

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Transactions of Nonferrous Metals Society of China 2018年第3期28卷 524-533页

作者： Qing-hua TIAN Duo DENG Yu LI Xue-yi GUO School of Metallurgy and Environment Central South UniversityChangsha 410083China Cleaner Metallurgical Engineering Research Center Nonferrous Metals Industry of ChinaCentral South UniversityChangsha 410083China

The ultrafine silver powders were prepared by liquid reduction method using arabic gum as *** effects of different dispersants,pH values,and temperature on the morphology and particle size of silver powders were *** is found that arabic gum can better adsorb on silver particles via chemical adsorption,and it shows the best dispersive effect among all the selected *** particle size of silver powders can be finely tuned from 0.34 to 4.09μm by adjusting pH values,while the morphology of silver powders can be tuned by changing the *** silver powders with high tap density higher than 4.0 g/cm3 were successfully prepared in a wide temperature range of 21.8-70°***,the tap density is higher than 5.0 g/cm3 when the temperature is optimized to be 50°*** facile process and high silver concentration of this method make it a promising way to prepare high quality silver powders for electronic paste.

关键词： ultrafine silver powder arabic gum dispersion mechanism tap density controllable preparation

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