oil droplet
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2022 ◽  
Vol 369 ◽  
pp. 130915
Author(s):  
Meigui Huang ◽  
Shuai Huang ◽  
Qiang Wang ◽  
Khizar Hayat ◽  
Mehraj Ahmad ◽  
...  

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 327
Author(s):  
Wiphada Mitbumrung ◽  
Numphung Rungraung ◽  
Niramol Muangpracha ◽  
Ploypailin Akanitkul ◽  
Thunnalin Winuprasith

The pretreatment process is an essential step for nanofibrillated cellulose production as it enhances size reduction efficiency, reduces production cost, and decreases energy consumption. In this study, nanofibrillated cellulose (NFC) was prepared using various pretreatment processes, either chemical (i.e., acid, basic, and bleach) or hydrothermal (i.e., microwave and autoclave), followed by disintegration using high pressure homogenization from oat bran fibers. The obtained NFC were used as an emulsifier to prepare 10% oil-in-water emulsions. The emulsion containing chemically pretreated NFC exhibited the smallest oil droplet diameter (d32) at 3.76 μm, while those containing NFC using other pretreatments exhibited d32 values > 5 μm. The colors of the emulsions were mainly influenced by oil droplet size rather than the color of the fiber itself. Both NFC suspensions and NFC emulsions showed a storage modulus (G′) higher than the loss modulus (G″) without crossing over, indicating gel-like behavior. For emulsion stability, microwave pretreatment effectively minimized gravitational separation, and the creaming indices of all NFC-emulsions were lower than 6% for the entire storage period. In conclusion, chemical pretreatment was an effective method for nanofiber extraction with good emulsion capacity. However, the microwave with bleaching pretreatment was an alternative method for extracting nanofibers and needs further study to improve the efficiency.


2022 ◽  
pp. 110941
Author(s):  
Martha L. Taboada ◽  
Eva Müller ◽  
Nora Fiedler ◽  
Heike P. Karbstein ◽  
Volker Gaukel

RSC Advances ◽  
2022 ◽  
Vol 12 (4) ◽  
pp. 2160-2170
Author(s):  
Evangelia Argentou ◽  
Carlos Amador ◽  
Anju Deepali Massey Brooker ◽  
Serafim Bakalis ◽  
Peter J. Fryer ◽  
...  

The synergistic effect of oil viscosity and oil droplet size on the deposition profile of oil on cotton fabric was studied using polydimethylsiloxane (PDMS) as a model oil-in-water emulsion system.


2021 ◽  
Author(s):  
Zhongyu Shi ◽  
Guanqing Wang ◽  
Xiangxiang Chen ◽  
Lu Wang ◽  
Ning Ding ◽  
...  

Abstract The phenomenon of droplet impact on the immiscible liquid is encountered in a variety of scenarios in nature and industrial production. Despite the exhaustive researches, it is not fully clear how the immiscibility of the droplet with impact liquid affects the crown evolution. The present work experimentally investigates the evolution kinematics of crown formed by a normal impact of camellia oil droplet on immiscible water layer. Based on discussion of dynamic impact behaviors for three critical Weber numbers (We), the radius of crown and its average spreading velocity are compared with those of previous theoretical models to discuss their applicability to the immiscible liquid. The evolution kinematics (morphology and velocity) are analyzed by considering the effects of We and layer thickness. Furthermore, the ability of crown expansion in radical and vertical directions is characterized by a velocity ratio. The results show that our experimental crown radius still follows a square-root function of evolution time, which agrees with the theoretical predictions. The dimensionless average spreading velocity decreases with We and follows a power-law, while the dimensionless average rising velocity remains constant. The velocity ratio is shown to be linearly increasing with We, demonstrating that the rising movement in crown evolution gradually enhances with We. These results are helpful for further investigation on the droplet impact on immiscible liquid layer.


2021 ◽  
Vol 13 (24) ◽  
pp. 13752
Author(s):  
Min Yang ◽  
Baiyu Zhang ◽  
Yifu Chen ◽  
Xiaying Xin ◽  
Kenneth Lee ◽  
...  

Oil spill and microplastics (MPs) pollution has raised global concerns, due to the negative impacts on ocean sustainability. Chemical dispersants were widely adopted as oil-spill-treating agents. When MPs exist during oil dispersion, MP/oil-dispersant agglomerates (MODAs) are observed. This study explored how MPs affect oil-dispersion efficiency in oceans. Results showed that, under dispersant-to-oil volumetric ratio (DOR) 1:10 and mixing energy of 200 rpm, the addition of MPs increased the oil droplet size, total oil volume concentration, and oil-dispersion efficiency. Under DOR 1:25 and mixing energy of 120 rpm, the addition of MPs increased the oil droplet size but resulted in a decrease of total oil volume concentration and dispersion efficiency. Compared with the oil volume concentration, the oil droplet size may no longer be an efficient parameter for evaluating oil-dispersion efficiency with the existence of MODAs. A machine learning (ML)-based XGBRegressor model was further constructed to predict how MPs affected oil volume concentration and oil-dispersion efficiency in oceans. The research outputs would facilitate decision-making during oil-spill responses and build a foundation for the risk assessment of oil and MP co-contaminants that is essential for maintaining ocean sustainability.


Author(s):  
Yongping Huang ◽  
Caili Dai ◽  
Zhixue Chen ◽  
Mengjiao Cao ◽  
Qixin Liu ◽  
...  

Author(s):  
Cosan Daskiran ◽  
Xinzhi Xue ◽  
Fangda Cui ◽  
Joseph Katz ◽  
Michel C. Boufadel

2021 ◽  
pp. 107278
Author(s):  
Davood Zaeim ◽  
Ana-Isabel Mulet-Cabero ◽  
Sophia A. Read ◽  
Weilin Liu ◽  
Jianzhong Han ◽  
...  

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