Adsorption of CTAB on Sapphire-c at High pH: Surface and Zeta Potential Measurements Combined with Sum-Frequency and Second-Harmonic Generation

Zeta电位 化学 吸附 表面电荷 脱质子化 反离子 和频发生光谱学 分子 化学物理 分析化学(期刊) 和频产生 溴化物 二次谐波产生 无机化学 物理化学 离子 材料科学 纳米技术 有机化学 纳米颗粒 非线性光学 光学 非线性系统 激光器 量子力学 物理
作者
Ahmed Abdelmonem,Yingchun Zhang,Björn Braunschweig,Dana Glikman,Armin Rumpel,Wolfgang Peukert,Tajana Begović,Xiandong Liu,Johannes Lützenkirchen
出处
期刊:Langmuir [American Chemical Society]
卷期号:38 (11): 3380-3391 被引量:4
标识
DOI:10.1021/acs.langmuir.1c03069
摘要

The adsorption of cetyltrimethylammonium bromide (CTA+Br-) on sapphire-c surfaces was studied at pH 10 below the surfactants' critical micelle concentration. The evolution of interfacial potentials as a function of CTAB concentration was characterized by surface and zeta potential measurements and complemented by molecular dynamic (MD) simulations as well as by second-harmonic (SHG) and vibrational sum-frequency generation (SFG) spectroscopy. The changes in interfacial potentials suggest that the negative interfacial charge due to deprotonated surface aluminols groups is neutralized and can be even overcompensated by the presence of CTA+ cations at the interface. However, SFG intensities from strongly hydrogen-bonded interfacial water molecules as well as SHG intensities decrease with both increasing CTAB concentration and the magnitude of the surface potential. They do not suggest a charge reversal at the interface, while the change in zeta potential is actually consistent with an apparent charge inversion. This can be qualitatively explained by results from MD simulation, which reveal adsorbed CTA+ cations outside a first strongly bound hydration layer of water molecules, where they can locally distort the structural order and replace some of the interfacial water molecules adjacent to the first layer. This is proposed to be the origin for the significant loss in SFG and SHG intensities with increasing CTAB concentration. Moreover, we propose that CTA+ can act as a counterion and enhance the occurrence of deprotonated surface aluminols that is consistent with the decrease in surface potential.
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
大幅提高文件上传限制,最高150M (2024-4-1)

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
科研通AI2S应助C.Z.Young采纳,获得10
1秒前
2秒前
复杂的浩天完成签到,获得积分10
2秒前
3秒前
叶枫完成签到 ,获得积分10
3秒前
3秒前
lkd完成签到,获得积分10
4秒前
顾矜应助杨杨杨采纳,获得10
4秒前
5秒前
爆米花应助玉米采纳,获得10
5秒前
5秒前
NexusExplorer应助彩色半烟采纳,获得10
6秒前
Ava应助彩色半烟采纳,获得30
6秒前
Owen应助彩色半烟采纳,获得50
6秒前
上官若男应助彩色半烟采纳,获得10
6秒前
小蘑菇应助彩色半烟采纳,获得10
6秒前
香蕉觅云应助彩色半烟采纳,获得30
6秒前
琪琪的发布了新的文献求助10
6秒前
丢丢发布了新的文献求助10
8秒前
Owen应助自信的红酒采纳,获得10
9秒前
JamesPei应助Kuma采纳,获得10
10秒前
搜集达人应助vn采纳,获得10
11秒前
谢迎波发布了新的文献求助10
11秒前
fairy完成签到,获得积分10
12秒前
12秒前
13秒前
金刚阿布达完成签到,获得积分10
13秒前
避橙完成签到,获得积分10
13秒前
freshman3005发布了新的文献求助30
13秒前
AM应助琪琪的采纳,获得10
13秒前
13秒前
SW完成签到,获得积分10
14秒前
dududu应助rio采纳,获得20
14秒前
脑洞疼应助something采纳,获得10
14秒前
14秒前
邵能琪完成签到,获得积分20
15秒前
完美世界应助科研通管家采纳,获得50
15秒前
小郭子应助科研通管家采纳,获得20
15秒前
桐桐应助科研通管家采纳,获得10
15秒前
师德完成签到,获得积分10
15秒前
高分求助中
The late Devonian Standard Conodont Zonation 2000
Nickel superalloy market size, share, growth, trends, and forecast 2023-2030 2000
The Lali Section: An Excellent Reference Section for Upper - Devonian in South China 1500
Very-high-order BVD Schemes Using β-variable THINC Method 890
Mantiden: Faszinierende Lauerjäger Faszinierende Lauerjäger 800
PraxisRatgeber: Mantiden: Faszinierende Lauerjäger 800
Fundamentals of Dispersed Multiphase Flows 500
热门求助领域 (近24小时)
化学 医学 生物 材料科学 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 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3258475
求助须知:如何正确求助?哪些是违规求助? 2900346
关于积分的说明 8309788
捐赠科研通 2569594
什么是DOI,文献DOI怎么找? 1395794
科研通“疑难数据库(出版商)”最低求助积分说明 653293
邀请新用户注册赠送积分活动 631201