Ruobing Bai's blog

Dear Colleagues,

We would like to invite you to submit abstract and attend the minisymposium titled "10-3 Adhesion, Friction, and Fracture at Soft Interfaces: Theory, Simulation, and Experiment" in the 2023 SES Annual Techinical Meeting, October 8-11, 2023, University of Minnesota. https://2023ses.com/

Abstract submissions are due Friday, May 5, 2023

Dear Colleagues,

We would like to invite you to submit abstract and attend the minisymposium titled "10-4 Elastomeric Fracture" in the 2023 SES Annual Techinical Meeting, October 8-11, 2023, University of Minnesota. https://2023ses.com/

Abstract submissions are due Friday, May 5, 2023

10-4 Elastomeric Fracture

As I conclude this year's undergraduate course Introduction to Materials Science, I have collected some interesting reading/watching materials for my class: https://docs.google.com/document/d/1GhuaP9K1fDXuHe8TcI5dmjJvnakDLKPOQNKGoNW-AXk/edit?usp=sharing

Most of them are publicly available. Comments and suggestions are appreciated.

Dear Colleagues,

We would like to invite you to submit abstract and attend the minisymposium titled "325 Mechanics of Liquid Crystal Elastomers" in the 19th U.S. National Congress on Theoretical and Applied Mechanics (USNC/TAM 2022), to be held June 19-24, 2022 at the University of Texas in Austin. Congress website: https://www.usnctam2022.org/

Multiple positions are available in the Bai group (https://sites.google.com/view/ruobingbai) in the Department of Mechanical and Industrial Engineering at Northeastern University. You are welcome to send email to Prof. Ruobing Bai (ru.bai@northeastern.edu) for further information about undergraduate research, PhD, postdoc, and visiting student/scholar. Please indicate your anticipated starting time.

PhD position

Dear Colleagues,

We would like to invite you to submit abstract and attend the minisymposium titled "325 Mechanics of Liquid Crystal Elastomers" in the 19th U.S. National Congress on Theoretical and Applied Mechanics (USNC/TAM 2022), to be held June 19-24, 2022 at the University of Texas in Austin. Congress website: https://www.usnctam2022.org/

Dr. Xiaoyu Tang’s group in the Department of Mechanical and Industrial Engineering at Northeastern University has multiple fully funded Ph.D. positions in the area of Fluid Mechanics and Soft Matter. Research in the group focuses on multiphase flow, microfluidics, and active colloidal systems, using both experimental and numerical techniques. Selected candidates are expected to start in Fall 2021. Visiting students/scholars are always welcome.

Qualification

Dear Colleagues,

Please find our new paper titled "Photochemical-induced phase transitions in photoactive semicrystalline polymers" published in Physical Review E. We used phase field model to investigate photochemical phase transitions in semicrystalline polymers.

Author: Ruobing Bai, Eric Ocegueda, and Kaushik Bhattacharya

Dear Colleagues,

Here is our recent paper published in EML on collective behavior in solid-state photoreaction. Combining statistical mechanics and continuum mechanics, we build a model to predict and explain multiple collective behaviors reported in experiments of solid-state photoreaction for the first time.

Collective behavior in the kinetics and equilibrium of solid-state photoreaction

Ruobing Bai, Ying Shi Teh, Kaushik Bhattacharya*

Dear Colleagues,

Our paper on theory of photomechanical elastomers has been published in JMPS. We explored the interplay between mechanical stress, light-induced reaction, and large deformation in photoactive nematic elastomers. You can find 50 days' free access here: https://authors.elsevier.com/c/1bceu57Zjx1Q7

Photomechanical coupling in photoactive nematic elastomers

Ruobing Bai, Kaushik Bhattacharya

Here are the elasticity notes of Eli Sternberg over many years as he taught AM 135 at Caltech. I had access to them when I was working with Prof. Kaushik Bhattacharya at Caltech during postdoc. Prof. Bhattacharya suggested making the notes publicly available via iMechanica, and below is a short note from him.

My group in the Department of Mechanical and Industrial Engineering at Northeastern University has multiple fully funded PhD positions, starting Spring/Fall 2021. Successful candidates will be working in the broad area of mechanics and/or materials, including but not limited to biomimetic and biological materials, soft active materials, soft robotics, multiphysics characterization, design, and functionalization. Research will be focused on the combination of theory and experiment.

Dear colleagues,

Here is our recently published review article about hydrogel adhesion. Hydrogel adhesion has undergone transformative advances in the last few years. This review article describes these advances, and outlooks future opportunities.

Title: Hydrogel Adhesion: A Supramolecular Synergy of Chemistry, Topology, and Mechanics

Authors: Jiawei Yang, Ruobing Bai, Baohong Chen, Zhigang Suo*

Abstract

Fatigue of hydrogels

Ruobing Bai (1,2), Zhigang Suo (1)

(1) John A. Paulson School of Engineering and Applied Sciences, Kavli Institute for Bionano Science and Technology, Harvard University

(2) Department of Mechanical and Civil Engineering, California Institute of Technology

Dear colleagues,

Here is our recent paper about designing flaw-insensitive hydrogels that resist fatigue crack growth.

Title: Flaw-Insensitive Hydrogels under Static and Cyclic Loads

Authors: Ruobing Bai, Jiawei Yang, Xavier P. Morelle, and Zhigang Suo*

Abstract

Dear colleagues,

I would like to share with you our latest paper focusing on the fracture of hydrogels of complex rheology.

Title: Tearing a hydrogel of complex rheology

Authors: Ruobing Bai, Baohong Chen, Jiawei Yang, Zhigang Suo*

Abstract:

Here is our review article on fatigue of hydrogels. This is the first review of the subject. We review fatigue as any failure of material under prolonged static or cyclic loads. The paper starts with fundamentals, and covers a broad field, yet leaving a lot of interesting questions to be answered. The paper links the chemistry and mechanics of hydrogels.

The publisher now provides 50 days’ free access to the paper.

Dear Colleagues,

Here you can find our recent paper about hydrogel sensor for chemical detection.

Hydrogel Interferometry for Ultrasensitive and Highly Selective Chemical Detection

Authors: Mo Sun, Ruobing Bai, Xingyun Yang, Jiaqi Song, Meng Qin, Zhigang Suo, Ximin He

Abstract

Jiawei Yang, Ruobing Bai, Zhigang Suo

https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201800671

Abstract

https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201800468

Meng Qin, Mo Sun, Ruobing Bai, Yiqi Mao, Xiaoshi Qian, Dipika Sikka, Yuan Zhao, Hang Jerry Qi, Zhigang Suo, Ximin He

Abstract:

Please see attachment for detailed information (in Chinese).

Dear Colleagues,

Here is our recent paper “Fatigue Fracture of Self-Recovery Hydrogels”. To the hydrogel community, this paper distinguishes the fatigue fracture and the self-recovery of a hydrogel. To the mechanics community, we show that, for the first time in hydrogels, the fatigue threshold depends only on the covalent network, but not on the noncovalent interactions that provide dissipation.

Dear Colleagues,

Attached please find our recent paper “Localized Deformation in Plastic Liquids on Elastomers”.

Title: Localized Deformation in Plastic Liquids on Elastomers

Authors: Xavier P. Morelle, Ruobing Bai and Zhigang Suo

Dear colleagues,

Attached please find our new paper "Fatigue fracture of tough hydrogels" published on Extreme Mechanics Letters.

Fatigue fracture of tough hydrogels

Ruobing Bai, Quansan Yang, Jingda Tang, Xavier P. Morelle, Joost Vlassak, Zhigang Suo

Optomechanics of Soft Materials

Ruobing Bai and Zhigang Suo