Ultrasound enhanced diffusion in hydrogels: An experimental and non-equilibrium molecular dynamics study

均方位移 扩散 振幅 流离失所(心理学) 材料科学 粒子(生态学) 超声波 质点位移 纳米颗粒 有效扩散系数 分子动力学 扩散方程 机械 热力学 化学 纳米技术 物理 光学 计算化学 声学 经济 心理治疗师 服务(商务) 海洋学 磁共振成像 心理学 放射科 医学 经济 地质学
作者
S Price,Caroline Einen,Othonas A. Moultos,Thijs J. H. Vlugt,Catharina de Lange Davies,Erika Eiser,Anders Lervik
出处
期刊:Journal of Chemical Physics [American Institute of Physics]
卷期号:160 (15)
标识
DOI:10.1063/5.0202182
摘要

Focused ultrasound has experimentally been found to enhance the diffusion of nanoparticles; our aim with this work is to study this effect closer using both experiments and non-equilibrium molecular dynamics. Measurements from single particle tracking of 40 nm polystyrene nanoparticles in an agarose hydrogel with and without focused ultrasound are presented and compared with a previous experimental study using 100 nm polystyrene nanoparticles. In both cases, we observed an increase in the mean square displacement during focused ultrasound treatment. We developed a coarse-grained non-equilibrium molecular dynamics model with an implicit solvent to investigate the increase in the mean square displacement and its frequency and amplitude dependencies. This model consists of polymer fibers and two sizes of nanoparticles, and the effect of the focused ultrasound was modeled as an external oscillating force field. A comparison between the simulation and experimental results shows similar mean square displacement trends, suggesting that the particle velocity is a significant contributor to the observed ultrasound-enhanced mean square displacement. The resulting diffusion coefficients from the model are compared to the diffusion equation for a two-time continuous time random walk. The model is found to have the same frequency dependency. At lower particle velocity amplitude values, the model has a quadratic relation with the particle velocity amplitude as described by the two-time continuous time random walk derived diffusion equation, but at higher amplitudes, the model deviates, and its diffusion coefficient reaches the non-hindered diffusion coefficient. This observation suggests that at higher ultrasound intensities in hydrogels, the non-hindered diffusion coefficient can be used.

科研通智能强力驱动
Strongly Powered by AbleSci AI
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
刚刚
MI发布了新的文献求助10
刚刚
JasonSun发布了新的文献求助10
刚刚
Owen应助加辣螺蛳粉采纳,获得10
刚刚
冰箱贴完成签到,获得积分10
1秒前
DIVA完成签到 ,获得积分10
1秒前
2秒前
2秒前
jia发布了新的文献求助10
2秒前
赘婿应助长孙归尘采纳,获得10
2秒前
咕噜完成签到,获得积分20
3秒前
shuaishuyi发布了新的文献求助10
3秒前
共享精神应助超级气泡水采纳,获得10
4秒前
4秒前
4秒前
4秒前
归尘发布了新的文献求助10
5秒前
18062677029完成签到 ,获得积分10
5秒前
6秒前
陈xt完成签到,获得积分10
6秒前
白泽应助陈情采纳,获得10
7秒前
在鹿特丹完成签到 ,获得积分10
7秒前
7秒前
7秒前
咕噜发布了新的文献求助10
7秒前
7秒前
科研通AI5应助bbbw采纳,获得10
8秒前
binol完成签到,获得积分10
9秒前
9秒前
9秒前
luo发布了新的文献求助10
9秒前
9秒前
桐桐应助123采纳,获得10
9秒前
起风了发布了新的文献求助10
11秒前
彭于晏应助yyang采纳,获得10
12秒前
在水一方应助默默幼南采纳,获得10
12秒前
Ava应助LOAD1N采纳,获得10
12秒前
13秒前
123发布了新的文献求助10
13秒前
杨树发布了新的文献求助10
13秒前
高分求助中
Continuum Thermodynamics and Material Modelling 4000
Production Logging: Theoretical and Interpretive Elements 2700
Les Mantodea de Guyane Insecta, Polyneoptera 1000
Unseen Mendieta: The Unpublished Works of Ana Mendieta 1000
El viaje de una vida: Memorias de María Lecea 800
Theory of Block Polymer Self-Assembly 750
Luis Lacasa - Sobre esto y aquello 700
热门求助领域 (近24小时)
化学 材料科学 生物 医学 工程类 有机化学 生物化学 物理 纳米技术 计算机科学 内科学 化学工程 复合材料 基因 遗传学 物理化学 催化作用 量子力学 光电子学 冶金
热门帖子
关注 科研通微信公众号,转发送积分 3514181
求助须知:如何正确求助?哪些是违规求助? 3096485
关于积分的说明 9231985
捐赠科研通 2791574
什么是DOI,文献DOI怎么找? 1531965
邀请新用户注册赠送积分活动 711694
科研通“疑难数据库(出版商)”最低求助积分说明 706954