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Influence of suspension stability on wet grinding for production of mineral nanoparticles

Particuology 2008年第2期6卷 120-124页

作者： S.Sakthivel Venkatesan V.Krishnan B.Pitchumani Particle Science and Technology Laboratory Department of Chemical EngineeringIndian Institute of TechnologyNew DelhiIndia

Grinding behavior of nanoparticles in an attritor mill and the minimum achievable particle size are strongly influenced by the suspension stability. In the present work, suspension stability （i.e. ξ-potential） of nanoparticles was studied by measuring pH as a function of grinding time in the wet milling process. It was found that after a certain time in an attritor mill, there is no further size reduction and the average product particle size increases monotonically. One of the reasons is that the production of submicron particles leads to more particle-particle interactions and consequently pH of the suspension decreases with grinding time. Usually pH value is related to suspension stability and it can be enhanced by addition of NaOH solution. The maximum negative ξ-potential of -51.2 mV was obtained at pH of 12 for silica. The higher the ξ-potential with the same polarity, higher will be the electrostatic repulsion between the particles. Hence, the maximum electrostatic repulsion force was maintained by the adjustment ofpH value in wet milling. The experiments were conducted at different pH conditions which were maintained constant throughout the experiments and nanosized particles were obtained consequently.

关键词： suspension stability ξ-Potential Nanosilica particle Attritor mill

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Influence of Various Hydrocolloids on suspension stability of Chia Seeds (Salvia hispanica L.) in Mango Beverage and Mango Flavored Beverage

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Food and Nutrition Sciences 2023年第2期14卷 101-118页

作者： Reda A. Aamer Ibrahim A. Attia E. S. Abd El-Wahab Hort. Crop Technology Research Department Food Technology Research Institute Agriculture Research Centre Giza Egypt Edfina Company for Preserved Food Alexandria Egypt

With the developing of juices and beverages industry, the processors need to bring new nutritional fortified products to capture the market as per the demand of the consumer who needs healthier product. Thus, this study aimed to the production of mango beverage and mango flavored beverage fortified with chia seeds;evaluate the chemical properties of chia seeds and study the effect of adding carboxymethyl cellulose, xanthan gum and low acyl gellan gum at the concentrations of 0.05% and 0.1% on the stability of suspension chia seeds in beverage during storage at ambient temperature for six months. Viscosity, color, zeta potential, suspension of seeds and organoleptic properties were evaluated. Results showed that chia seeds were rich in protein, omega-3 fatty acids and dietary fiber. The addition of 0.05% gellan gum led to improved appearance attributes and the highest stability of suspension of chia seeds for six months, and was the sample which scored highest for overall acceptability compared to the other samples of beverages. Results indicated that using chia seeds with the addition of 0.05% low acyl gellan gum led to the production of fortified mango beverage and mango flavored beverage with high stability for six months.

关键词： Mango Beverage Mango Flavored Beverage Chia Seeds Hydrocolloids suspension stability

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Stabilization of nickel nanoparticle suspensions with the aid of polymer and surfactant: static bottle tests and dynamic micromodel flow tests

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Petroleum Science 2020年第4期17卷 1014-1024页

作者： Siyuan Yi Tayfun Babadagli Huazhou Li School of Mining and Petroleum Engineering Faculty of EngineeringUniversity of AlbertaEdmonton T6G 1H9Canada

Nickel nanoparticles can work as catalyst for the aquathermolysis reactions between water and heavy oil.A homogeneous and stable suspension is needed to carry the nickel nanoparticles into deeper *** study conducts a detailed investigation on how to achieve stabilized nickel nanoparticle suspensions with the use of surfactant and *** stabilize the nickel nanoparticle suspension,three surfactants including sodium dodecyl sulfate,cationic surfactant cetyltrimethylammonium bromide and polyoxyalkalene amine derivative(Hypermer) along with xanthan gum polymer were introduced into the nickel nanoparticle *** stability tests and zeta potential measurements were conducted to determine the polymer/surfactant recipes yielding the most stable nickel nanoparticle *** micromodel flow tests were also conducted on three suspensions to reveal how the nickel nanoparticles would travel and distribute in porous *** results showed that when the injection was initiated,most nickel nanoparticles were able to pass through the gaps between the sand grains and produced in the outlet of the micromodel;only a small number of the nickel nanoparticles were attached to the grain surface.A higher nickel concentration in the suspension may lead to agglomeration of nickel nanoparticles in porous media,while a lower concentration can mitigate this ***,clusters tended to form when the nickel nanoparticle suspension carried an electrical charge opposite to that of the porous ***-up waterflood was initiated after the nanofluid *** was found that the waterflood could not flush away the nanoparticles that were remaining in the micromodel.

关键词： Aquathermolysis reactions Nickel nanoparticles Polymer surfactant suspension stability

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Enhanced Anticancer Cells Effects of Optimized suspension Stable As2O3-Loaded Poly（lactic-co-glycolic acid） Nanocapsules

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Chinese Journal of Chemistry 2015年第7期33卷 777-784页

作者： Xiaoli Song Juan You Chunlan Xu Aiping Zhu Caifeng Yan Rong Guo College of Chemistry and Chemical Engineering Yangzhou University Yangzhou Jiangsu 225002 China Northern Jiangsu People's Hospital Yangzhou Jiangsu 225001 China

This study is to prepare a nanosuspension based on poly（lactic-co-glycolic acid）（PLGA） for delivery, controlled release and enhanced anti-solid tumor effects of As2O3. As2O3-1oaded PLGA nanocapsules （As2O3-PLGANCs） were prepared by double emulsion-solvent evaporation method and were optimized by univariate analysis in combination with orthogonal experimental according to several factors. The optimized As2O3-PLGA NCs presented suitable physical stability, favorable size of （200.2± 10.6） nm （PDI=0.117 ±0.008）, spherical shape, and high encapsulation efficiency （92.48%± 2.14%）. The in vitro suspension stability of the NCs was excellent. The release of As2O3 from the NCs showed pH responsive release characteristics. The NCs can be efficiently taken up by SMMC-7721 cell and showed excellent antitumor efficacy against SMMC-7721 cell line. Then, As2O3-PLGA NCs could be considered as a promising formulation for the pH dependent release of As2O3 in cancer cells and enhance the anti-solid tumor effects of As2O3.

关键词： As2O3-PLGA nanocapsules orthogonal experiment suspension stability drug delivery

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