ULTRASONICS SONOCHEMISTRY
·
2015
·
IF 4.321
Xiaoming Luo,Limin He,Hongping Wang,Haipeng Yan,Yahua Qin
The motion of a single water droplet in oil under ultrasonic irradiation is investigated with high-speed photography in this paper. First, we described the trajectory of water droplet in oil under ultrasonic irradiation. Results indicate that in acoustic field the motion of water droplet subjected to intermittent positive and negative ultrasonic pressure shows obvious quasi-sinusoidal oscillation. Afterwards, the influence of major parameters on the motion characteristics of water droplet was studied, such as acoustic intensity, ultrasonic frequency, continuous phase viscosity, interfacial tension, and droplet diameter, etc. It is found that when the acoustic intensity and frequency are 4.89 W cm −2 and 20 kHz respectively, which are the critical conditions, the droplet varying from 250 to 300 μm in lower viscous oil has the largest oscillation amplitude and highest oscillation frequency.
研究领域:
物理学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2021
·
IF 6.475
Qing Li,Mengyue Xu,Yunyi Yang,Jian Guo,Zhili Wan,Xiaoquan Yang
Novel supramolecular nanofibrils assembled from food-grade saponin glycyrrhizic acid (GA) are effective building blocks to make complex multiphase systems, e.g., emulsion foams. In this work, the effects of different oil phases (castor oil, sunflower oil, dodecane, and limonene) on the formation, stability and structural properties of long-lived emulsion foams prepared by GA nanofibrils (GNs) were investigated. The obtained results showed that soft-solid emulsion foams (4 wt% GNs) can be fabricated, independently of oil phase, and their structural properties, viscoelasticity, and tribological properties can be well tuned by oil phase polarity. Compared to the GNs aqueous foams, the presence of jammed emulsion droplets in the liquid channels and at the surfaces of bubbles can provide a higher bubble stability for emulsion foams. For more polar oil phase (castor oil), GNs showed a higher affinity to the oil–water interface with a lower interfacial tension, thus forming smaller oil droplets and bubbles, which leads to the higher mechanical strength, denser network microstructures, and lower friction coefficients of emulsion foams. However, the limonene foam exhibited weak storage stability and rheological properties, as well as the relatively low lubrication, which may be related to the formation of oil droplet aggregates and clusters induced by the volatility of limonene. GN-based emulsion foams are thermoresponsive, independently of oils, and the temperature-switchable process for the destabilization and regeneration of foams can be controlled and repeated. These emulsion foams based on natural saponin nanofibrils with tunable properties have potential sustainable applications in foods, pharmaceuticals, and personal care products.
研究领域:
食品科学
·
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2023
·
IF 3.8
Jiahao Pan,Wei Wang,Min Ji,Xing Xing,Zhenda Lu
Although various methods have been developed to synthesize Ag nanocubes, their synthesis in oil phase has received little attention. We report a robust method to synthesize single-crystalline Ag nanocubes with high purity (>95%) and uniform size in oil phase. The evolution of Ag nanoparticles from different reaction times indicates that multiply twinned seeds (MTDs) and single-crystalline seeds were formed together at the early stage of the reaction. With the reaction process, the MTDs were gradually etched by chloride ions and air, and the remaining single-crystalline seeds grew into nanocubes. The effect of synthetic parameters such as temperature, air flow, and the concentration of cupric chloride and AgNO3 precursors on the morphology and size of Ag nanocubes has been systematically investigated, among which temperature plays an important role in controlling the balance between the etching rate and growth rate. Due to the slow ion diffusion rate compared to that in the water or polyol system, oil-phase synthesis provides a wide regulatory window for completely etching the MTDs, ensuring the high purity of single-crystalline Ag nanocubes.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Fukang Deng,Tao Jiang,Kedi Yang,Fuchuan Huang
Developing an eco-friendly and energy efficient lubricant additive is important in the field of tribology . Herein, we successfully synthesized a series of green and efficient lubricant additives by grafting the n-carbon alkyl chain to tea saponin (TSCn, n = 8,10,12,14,16), nano tribofilm can self-assemble on sliding surfaces in both water and oil phases. Low frequency and high contact stress ball-on-disc reciprocating friction tests showed that TSC14 and TSC16 exhibit excellent lubricating performance. When 0.5 wt% of TSC14/TSC16 was added in DI water, the friction coefficient and wear rate were reduced by 67.69%/69.74% and 79.42%/81.65%, respectively. When 0.5 wt% of TSC14/TSC16 was added in PAO6, the friction coefficient and wear rate were reduced by 46.15%/42.86% and 86.19%/80.48%, respectively. In addition, the TSC14/TSC16 emulsion also exhibited good stability and lubricity.
研究领域:
材料科学
·
摩擦学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2020
·
IF 7.053
Hongqiang Chen,Yao Lu,Fang Yuan,Yanxiang Gao,Like Mao
Alginate-based emulsion gels with different oil fraction (0–20%) and interfacial compositions were developed to understand the filling roles of oil droplets, and the gels were used to simultaneously encapsulate a lipophilic and a hydrophilic bioactives. Glucono-delta-lactone (GDL) was used to induce the release of Ca 2+ from CaCO 3 , which allowed the cross linking of alginate to form gel network and trap the oil droplets. The increase in oil fraction significantly reduced syneresis degree and improved water holding capacity (WHC) of the emulsion gels with tween 20 (TW), negatively charged WPI (-/WPI), whey protein aggregates (WPA) at the interface. Significantly increased fracture force was observed in the emulsion gels with positively charged WPI (+/WPI) with the increase in oil fraction. In the systems containing TW, -/WPI or WPA, the inclusion of oil phase mostly resulted in lower fracture force than the systems without oil. However, all the systems had higher relaxed stress (at equilibrium) with higher oil content. Swelling tests revealed that the systems with an oil content of 10% had the highest swelling ratio, and the gels containing +/WPI had the lowest swelling ratio among all the systems. When EGCG and β-carotene were encapsulated within the emulsion gels, they presented a synergistic effect on heating stability as both EGCG and β-carotene had higher stability when encapsulated simultaneously than individually.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Junhua Lu,Xinyi Yin,Qiu Wu,Mengjiao Wang,Liying Han,Shupeng Su
The fabrication of Pickering nanoemulsions, specifically food-grade ones, is challenging due to the limited availability of particles with appropriate amphiphilic wettability and sufficiently small particle size. Chitosan nanoparticles offer a promising solution due to their adjustable size and amphiphilic properties. The study investigated the effects of pH, oil phase volume fraction, chitosan concentration, and ultrasonic intensity on the formation of chitosan Pickering nanoemulsions. Nanoemulsions with droplet size of approximately 300 nm were achieved under optimal conditions of pH 6.5, oil phase volume fraction of 1 %, chitosan concentration of 1.0 wt%, and 455 W ultrasonic power for 360 min. Stability tests indicated that the nanoemulsions had good pH (2–6), ionic strength (100–500 mM), thermal (60–90 °C), freeze-thaw (3 times) and storage stabilities (0–60 days). The findings highlight the potential of chitosan nanoparticles as effective stabilizers for Pickering nanoemulsions, providing valuable insights for the development of food-grade Pickering nanoemulsions.
研究领域:
食品科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Chunhui Li,Shuozhen Cheng,Jinfeng Dong,Xuefeng Li
A series of block copolymers poly ( N -2-(methacryloyloxy) ethyl pyrrolidone)- b -poly (benzylmethacrylate) (PNMP 39 - b -PBzMA n ) were developed. These amphiphilic copolymers formed diversified aggregates in water, depending on the degree of polymerization n of the PBzMA segment. There presented the n -induced morphological transition from spherical micelles to vesicles via wormlike micelles. Moreover, PNMP 39 - b -PBzMA n aggregates were excellent dual function emulsifiers, showing similarity with both particles and surfactants simultaneously. The emulsification of PNMP 39 - b -PBzMA n aggregates was affected significantly by the degree of polymerization n of the PBzMA segment and oil. However, the effect of oil was more remarkable in comparison with that of n , in which the compatibility between oil and the hydrophobic PBzMA segment was critical. In general, O/W and W/O emulsions were formed for oils with poor and good compatibility to the PBzMA segment such as nonpolar alkanes and toluene, respectively. In these cases, PNMP 39 - b -PBzMA n aggregates were remained in water in the alkane/water systems, whereas they were transferred into the toluene phase according to the similarity-intermiscibility principle. For isopropyl myristate, a polar oil with the intermediate compatibility to the PBzMA segment, PNMP 39 - b -PBzMA n in water were transferred into the oil phase partially. Accordingly, emulsifiers in water and oil benefit the formation of O/W and W/O emulsions, respectively, as observed in the alkane/water and toluene/water systems. As a result, O/W and W/O emulsions were generated by PNMP 39 - b -PBzMA n with relatively small and large n , respectively. For PNMP 39 - b -PBzMA n with the intermediate n , W/O/W multiple emulsions were formed attributing to the synergistic emulsification of PNMP 39 - b -PBzMA n in water and oil.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2024
·Vol. 302
·期 6
·901-909
·
IF 2.2
Pang Yuxia,Luo Yingdong,Li Zhiping,Luo Yanling,Lou Hongming,Zhou Mingsong
Pickering emulsion stabilized by lignin particles has many advantages such as high flexibility, natural non-toxicity, anti-oxidation, and anti-ultraviolet. In order to promote the application of industrial lignin in the field of Pickering emulsions, this study has done comparatively systematic and basic research on Pickering emulsions stabilized by lignin particles. The emulsification effects of lignin particles on cyclohexane and n-decanol which have opposite polarity were compared firstly under different oil-water ratios. It was found that stable emulsions formed when the three-phase contact angle of oil/water/lignin was closer to 90°. The weakly polar cyclohexane could be well-emulsified by lignin particles, while the strong polar n-decanol could not. Cyclohexane was used as the oil phase to discuss the emulsification ability of lignin particles under different concentrations or with different particle sizes. The results show increasing the concentration of lignin particles or reducing the particle size can improve the emulsification performance.
研究领域:
胶体与界面科学
·
高分子科学
·
材料工程
·
化学工程
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Jingyi Zheng,Lixin Ding,Junjie Yi,Linyan Zhou,Lei Zhao,Shengbao Cai
This study investigated the effects of oil phases on the encapsulation rate, storage stability, and bioavailability of astaxanthin (ASTA) in Pickering emulsions (PEs). Results showed PEs of mixed oils (olive oil/edible tea oil) had excellent encapsulation efficiency (about 96.0%) and storage stability of ASTA. In vitro simulated gastrointestinal digestion results showed the mixed oil PE with a smaller interfacial area and higher monounsaturated fatty acid content may play a better role in improving ASTA retention and bioaccessibility. In vivo absorption results confirmed the mixed oil PE with an olive oil/edible tea oil of 7:3 was more favorable for ASTA absorption. Molecular dynamics simulation showed ASTA bound more strongly and stably to fatty acid molecules in the system of olive oil/edible tea oil of 7:3; and van der Waals force was the main binding force. NMR further proved there really were interactions between ASTA and four main fatty acids.
研究领域:
食品科学
·
营养学
·
生物物理学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Yunxing Li,Shengwei Zhang,Hang Jiang,Xin Guan,To Ngai
Microgels are regarded as soft colloids with environmental responsiveness. However, the majority of reported microgels are inherently hydrophilic, resulting in aqueous dispersions, and only used in water-based applications. Herein, we reported an efficient method for hybridization of poly(N-isopropylacrylamide) microgel by coating hydrophobic silica nanoparticles on their surface. The resultant hybrid microgel had switchable surface wettability and could be dispersed in both aqueous and oil phases. Meanwhile, the coated hydrophobic silica nanoparticles solved the difficulty in redispersing microgels caused by particle aggregation and film formation during the drying process, providing a significant advantage in dried storage. Furthermore, the introduction of hydrophobic silica nanoparticles endowed the hybrid microgel with a variety of applications, including cargo encapsulation, active release induced by emulsion reversion, and trace water absorption.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Yijing Yang,Qianchen Rui,Xiao Yan,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Rong Chen,Qiang Liao
Herein, we propose a novel optical strategy for stable water droplet trapping in an immiscible oil phase by using a 1550 nm focused laser beam. Distinct from conventional optical strategies, this approach leverages a local photothermal effect-induced flow field surrounding the water droplet in the oil phase to achieve stable droplet trapping without prolonged interaction between the laser and the water droplet, allowing for low-temperature operation. This feature effectively minimizes potential thermal damage risks and thereby preserves the viability of samples within the droplet, which is particularly promising for biological applications. By analyzing the force balance in vertical and horizontal directions, the trapping sites are predicted, and the results agree well with experimental data. Remarkably, the local photothermal effect-induced flow field imparts rotational momentum to the water droplet, enabling self-rotation of the trapped droplet, which enhances the internal mixing efficiency. This unique feature is demonstrated by the synthesis of gold nanoparticles and E. coli cultivation. This optical strategy allows for highly precise droplet manipulation, eliminating physical contact with solid surfaces, thereby avoiding contamination risks and ensuring lossless transfer. This work presents an innovative optical strategy for droplet trapping in an immiscible phase, holding promise for various applications.
研究领域:
光操控
·
微流控
·
生物光子学
·
纳米技术
·
软物质物理
·
化学工程
·
生物应用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2021
·
IF 4.346
Ming Qu,Tuo Liang,Jirui Hou,Zhichang Liu,Erlong Yang,Xingquan Liu
Recently, spherical nanoparticles have been studied to enhance oil recovery (EOR) worldwide owing to their remarkable properties. However, there is a lack of studies of nanosheets on EOR. Here, the amphiphilic molybdenum disulfide nanosheets were synthesized through a straightforward hydrothermal method. The octadecyl amine (ODA) molecules were grafted onto the surfaces of molybdenum disulfide nanosheets due to the presence of defects on the MoS 2 nanosheets surfaces. The synthesized amphiphilic molybdenum disulfide nanosheets (ODA-MoS 2 nanosheets) are approximate 67 nm in width. The effects of ultralow concentration ODA-MoS 2 nanosheets on the dynamic wettability change of solid surfaces and emulsion stability were also studied and discussed. Besides, the laboratory displacement experiments were also carried out to reveal the adsorption rules and the oil displacement effects by using ultralow concentration ODA-MoS 2 nanosheets. Experimental results indicate that the oil-wet solid surface (a contact angle of 130°) can transform into the neutral-wet solid surface (a contact angle of 90°) within 120 h after 50 mg/L ODA-MoS 2 nanosheets treatment. In addition, micro-scale emulsions in size of 2 μm can be formed after the addition of ODA-MoS 2 nanosheets by adsorbing onto the oil-water interfaces. The desorption energy of a single ODA-MoS 2 nanosheet from the oil-water interface to the bulk phase is proposed. When the concentration of ODA-MoS 2 nanosheets is 50 mg/L, the emulsions are the most stable. Core flooding results demonstrate that the ultimate residue of ODA-MoS 2 nanosheets in porous media is less than 11%, and the highest increased oil recovery of around 16.26% (OOIP) is achieved. Finally, the production performance of ultralow concentration of ODA-MoS 2 nanofluid (50 mg/L) in the application of Daqing Oilfield is summarized and discussed.
研究领域:
化学工程
·
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）