Emulsions stabilised solely by colloidal particles

肺表面活性物质 润湿 乳状液 皮克林乳液 胶体 絮凝作用 吸附 接触角 体积分数 材料科学 表面能 相位反转 乳化燃料 油滴 化学 化学工程 有机化学 复合材料 工程类 生物化学
作者
Robert Aveyard,Bernard P. Binks,John H. Clint
出处
期刊:Advances in Colloid and Interface Science [Elsevier BV]
卷期号:100-102: 503-546 被引量:2254
标识
DOI:10.1016/s0001-8686(02)00069-6
摘要

The preparation and properties of emulsions, stabilised solely by the adsorption of solid particles at the oil–water interface, are reviewed especially in the light of our own work with particles of well-controlled surface properties. Where appropriate, comparison is made with the behaviour of surfactant-stabilised emulsions. Hydrophilic particles tend to form oil-in-water (o/w) emulsions whereas hydrophobic particles form water-in-oil (w/o) emulsions. Many of the properties can be attributed to the very large free energy of adsorption for particles of intermediate wettability (contact angle at the oil–water interface, say, between 50 and 130°). This effectively irreversible adsorption leads to extreme stability for certain emulsions and is in contrast to the behaviour of surfactant molecules which are usually in rapid dynamic equilibrium between the oil–water interface and the bulk phases. There is evidence that, in some systems, weak flocculation of the particles improves the emulsion stability. Phase inversion from w/o to o/w can be brought about by increasing the volume fraction of water. Emulsions close to this inversion point tend to be the most stable, again in contrast to surfactant systems. The volume fraction needed for inversion depends on the particle wettability and the nature of the oil and these effects have been rationalised in terms of surface energy components. Stable multiple emulsions (w/o/w and o/w/o) can be made using two types of particles with slightly different wettability. Similar multiple emulsions prepared with two types of surfactant tend to be much less stable. The possibility of preparing novel solid materials by evaporating solid-stabilised emulsions is also proposed. Finally we report on some extensions to the work of Levine et al. who obtained expressions for the free energy of formation of emulsion drops covered with close-packed monolayers of monodisperse spherical particles. In particular in the light of the observations that nanoparticles can act as excellent emulsion stabilisers, we have considered potential effects on the free energy of emulsion formation of the action of small (physically realistic) positive and negative line tensions in the 3-phase contact lines skirting particles adsorbed at the droplet interfaces. We also explore the possibility that curvature properties of close-packed particle monolayers can affect emulsion properties in much the same way that surfactant monolayer properties influence emulsion type and stability.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
1秒前
皖医梁朝伟完成签到 ,获得积分0
2秒前
3秒前
4秒前
追梦小帅完成签到,获得积分0
4秒前
香蕉觅云应助Morch2021采纳,获得10
5秒前
7秒前
8秒前
8秒前
miselling发布了新的文献求助10
9秒前
Hello应助838915882蒽采纳,获得10
10秒前
UUUUUp完成签到,获得积分10
12秒前
大渣饼完成签到 ,获得积分10
13秒前
14秒前
黄智清发布了新的文献求助10
14秒前
14秒前
小马甲应助阳阳语晗采纳,获得10
14秒前
ding应助草莓采纳,获得10
15秒前
李健的小迷弟应助LLL采纳,获得10
16秒前
16秒前
17秒前
无糖乐发布了新的文献求助10
18秒前
18秒前
miselling完成签到,获得积分10
18秒前
ding应助无糖乐采纳,获得10
21秒前
Morch2021发布了新的文献求助10
21秒前
22秒前
hhx发布了新的文献求助10
22秒前
arisw发布了新的文献求助30
22秒前
美兮完成签到 ,获得积分10
22秒前
桐桐应助艾益静采纳,获得10
24秒前
26秒前
838915882蒽发布了新的文献求助10
28秒前
曾鑫完成签到,获得积分10
29秒前
Felix发布了新的文献求助10
30秒前
深情安青应助ZH采纳,获得10
30秒前
ding应助hhx采纳,获得10
30秒前
华仔应助豆豆采纳,获得10
30秒前
科研通AI5应助皮崇知采纳,获得10
31秒前
木子发布了新的文献求助10
31秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
Immigrant Incorporation in East Asian Democracies 600
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3966822
求助须知:如何正确求助?哪些是违规求助? 3512333
关于积分的说明 11162715
捐赠科研通 3247203
什么是DOI,文献DOI怎么找? 1793730
邀请新用户注册赠送积分活动 874602
科研通“疑难数据库(出版商)”最低求助积分说明 804432