Article
Chemistry, Multidisciplinary
Ke-Xin Hou, Shu-Peng Zhao, Da-Peng Wang, Pei-Chen Zhao, Cheng-Hui Li, Jing-Lin Zuo
Summary: This study combines flexible polymer and rigid conductive materials to prepare a conductive gel with multifunctional sensing performance, which has a modulus similar to that of skin and exhibits good external stimulus perception, self-healing, and other characteristics. The conductive gel can convert changes in temperature and strain into electrical signal changes and shows great potential in wearable devices and physiological signal detection.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
David Melancon, Benjamin Gorissen, Carlos J. Garcia-Mora, Chuck Hoberman, Katia Bertoldi
Summary: This passage discusses the design of large-scale structures with deployability, presenting two main strategies historically used and their limitations. Drawing inspiration from the Japanese art of paper folding, a novel design approach is proposed to construct large-scale inflatable systems that can lock in place after deployment.
Article
Chemistry, Multidisciplinary
Antonio Elia Forte, Paul Z. Hanakata, Lishuai Jin, Emilia Zari, Ahmad Zareei, Matheus C. Fernandes, Laura Sumner, Jonathan Alvarez, Katia Bertoldi
Summary: Researchers have developed a simple and efficient method to design pre-programmed 3D shapes using neural networks and 2D planar composite membranes. The method also determines the required inflation pressure. It has the potential for various applications at different scales.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Christopher Delre, Yufeng Jiang, Philjun Kang, Junpyo Kwon, Aaron Hall, Ivan Jayapurna, Zhiyuan Ruan, Le Ma, Kyle Zolkin, Tim Li, Corinne D. Scown, Robert O. Ritchie, Thomas P. Russell, Ting Xu
Summary: Using inspiration from origami, rigid-walled deployable structures that are multistable and inflatable have been designed. A library of bistable origami shapes created and then combined to build meter-scale functional structures.
Article
Nanoscience & Nanotechnology
Luca Mazzaferro, Samuel J. Lounder, Ayse Asatekin
Summary: The limited chemistries of membranes on the market restrict their applications in various separations. This study introduces a new class of membrane materials based on self-assembly of random polyampholyte amphiphilic copolymers, which exhibit excellent permeability, selectivity, and fouling resistance. The membranes feature ionic nanodomains as nanochannels for water permeation, surrounded by hydrophobic nanodomains to maintain structural integrity. Precise control over selectivity is achieved by designing the copolymers, enabling a wide range of applications in wastewater treatment and chemical separations.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
Xiaohua Gu, Xiaoyao Wang, Xinyu Guo, Siwen Liu, Chunhua Lou, Yan Liu
Summary: This study achieved the high-efficiency degradation and alcoholysis recovery of waste polyurethane foam by utilizing a high-efficiency alkali metal catalyst (CsOH) and two-component mixed alcoholysis agents (glycerol and butanediol) in different proportions. A series of tests were conducted on the properties of the degradation products, and the optimal conditions of alcoholysis were determined. Regenerated polyurethane foam with good thermal stability and meeting national standards was successfully prepared.
Article
Urology & Nephrology
Eusebio Luna, Bradley Garden, Dayron Rodriguez, Luanda Y. Perez, Dailianys Barrios, Fernando J. Bianco, Edward Gheiler
Summary: This study describes the technique and early results of inflatable penile prosthesis (IPP) deactivation via puncture and drainage in the office setting, aiming to avoid penile explanting interventions in high-risk surgical patients. The findings indicate that this procedure is safe and reliable, with no reported complications. The authors strongly recommend puncturing implants in patients with severe cognitive decline to prevent potential complications.
Article
Construction & Building Technology
Zhaoqing Chen, Chao Wei, Zhenmin Li, Cong Zeng, Junbin Zhao, Ningning Hong, Ning Su
Summary: This paper presents the wind-induced responses and wind-resistant design method of spherical inflatable membrane structures. Through nonlinear dynamic time-history analysis, considering the influences of spans, rise-span ratios, internal pressures, wind velocities, and cable configurations, the characteristics of wind-induced responses are studied. The results show that wind velocity affects the position of maximum displacement and increasing internal pressure can reduce deflection but increase membrane stress. Furthermore, a wind-resistant design method using equivalent static analysis is developed and empirical formulas and recommendation values are provided for engineering reference.
Article
Engineering, Aerospace
Na Li, Haijun Peng, Fei Li
Summary: The inflatable folded membrane structure, made of flexible materials, has the advantages of simplicity, high efficiency, light weight, low cost, and reliability. To address the issue of traditional constant rate inflation failing to consider both development time and stability, this paper proposes a variable inflation rate method combined with optimal control, allowing for quick and stable deployment. Simulation results show that the proposed method is more stable and energy efficient than fast inflation rates, while also being faster than slow inflation rates.
Article
Biochemistry & Molecular Biology
Akash Gondaliya, Mojgan Nejad
Summary: This study evaluated the suitability of various lignins in replacing 20% of petroleum-based polyol in PU foams, finding that the incorporation of lignin improved the foam's mechanical properties. The study also showed a positive correlation between lignin's hydroxyl content and foam properties, suggesting lignins with low hydroxyl content, high flexibility, and high solubility are better candidates for replacing petroleum-based polyols in flexible PU foams.
Article
Engineering, Manufacturing
Ting-Ting Li, Mengfan Xing, Bo Gao, Hai-Tao Ren, Hao-Kai Peng, Xiayun Zhang, Jia-Horng Lin, Ching-Wen Lou
Summary: This study presents a new strategy for designing puncture-resistant composites with self-healing and synergistic toughening efficacy for secondary utilization after puncture damage. The composites prepared with Pluronic/PMEA hydrogel and aramid fabrics exhibit extremely high toughness and puncture resistance, showing a synergistic effect between the two components. The proposed soft composites with effective puncture-resistant performance can serve as a significant guidance for future designs of recyclable puncture-resistant composites after damage.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Chemical
Liquan Xie, Yawei Wu, Xin Liang, Peng Jin
Summary: In this study, we propose underwater straight tube deformable structures based on hydrogel beads. The strength of the structural elements is studied through bending experiments, and the relationship between the stiffness of the straight tube deformable structure and the initial mass of the hydrogel beads is established. The specifications of flexible sacrificial pile for indoor test are successfully selected based on the stiffness conditions determined by theoretical derivation, and in the pier scouring test, it is found that flexible sacrificial piles provide better protection performance compared to rigid sacrificial piles.
Article
Engineering, Environmental
Mei Qun Seah, Zhi Chien Ng, Woei Jye Lau, Mehmet Gursoy, Mustafa Karaman, Tuck-Whye Wong, Ahmad Fauzi Ismail
Summary: This study introduced a solvent-free and rapid surface functionalization approach based on chemical vapor deposition (CVD) to improve the absorption capacity and reusability of polyurethane (PU) foams. Among the monomers tested, hexamethyldisiloxane (HMDSO) and 2,2,3,4,4,4-hexafluorobutyl acrylate (HFBA) showed promising results in enhancing the foam's surface hydrophobicity and absorption performance. The modified foams exhibited higher absorption capacity for cyclohexane and crude oil, with improved reusability through ethanol rinsing after each absorption cycle.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Biochemistry & Molecular Biology
Wenjun Du, Huiyi Yang, Cong Lu, Ziyuan Fang, Tingting Liu, Xiangbo Xu, Yudong Zheng
Summary: In this study, a gelatin-oxidized dextran (GA-OD) adaptive membrane with good biocompatibility, self-healing, biodegradability, and antimicrobial properties was created by modifying glucan. The cross-linking between GA and OD overcame the low gel temperature of GA, accelerated gelling, and improved mechanical properties, hydrophilicity, and degradability. The dynamic bond formed by the reaction between GA and OD allowed the GA-OD film to self-heal and exhibit antibacterial properties. In vivo experiments showed that the GA-OD membrane was biocompatible and did not cause edema or inflammation in uterine tissue. Moreover, the GA-OD material showed excellent epithelial reconstruction and cell proliferation, indicating promising therapeutic implications for endometrial repair.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Materials Science, Multidisciplinary
Samuel J. Lounder, Ayse Asatekin
Summary: There is an urgent need for new polymer chemistries to develop nanofiltration membranes with improved fouling and chlorine resistance. This study introduces charged zwitterionic amphiphilic copolymers (CZACs), which self-assemble to form membranes with anionic nanopores. These CZAC membranes exhibit enhanced salt rejection and exceptional fouling resistance, addressing key performance limitations of current nanofiltration membranes.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Tohya Kanahama, Motohiro Sato
Summary: This study theoretically explains the effect of initial deflection and initial slope on self-buckling characteristics of heavy columns and proposes a formula characterizing the self-buckling problem. The results show that the greatest height is proportional to the 2/3 power of radius, and the formula can potentially predict the height of tree-like natural structures.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Aps Selvadurai, Alexander P. Suvorov
Summary: This paper examines the torsion of a solid cylinder made of a fluid-saturated porous medium with a hyperelastic porous skeleton. It analyzes the mechanics of the twisted cylinder in both short-term and long-term behaviors, using numerical solutions and the ABAQUSTM finite element code.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
S. Kanaun
Summary: This study focuses on spherical radially transverse isotropic heterogeneous inclusions in homogeneous isotropic conductive host media. The volume integral equation for the field in the medium with an isolated inclusion subjected to a constant external field is solved using Mellin-transform technique. The method allows revealing tensor structure of the solution with precision to one scalar function of radial coordinate. The study also investigates the influence of neutral inclusions and conductivity coefficients on the effective conductivity of the composite material.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Marinos Kattis, Vassilis Tsitsos, Vassilis Karatzaferis
Summary: The proposed model utilizes continuum mechanics to describe the mechanical behavior of a weakened interface between materials with microstructure, simulating the weakened interface using a surface elastic medium adhering on either side with bulk elastic continua. The model is able to investigate the effect of a weakened interface on stress concentration around inhomogeneities embedded in an unbounded matrix of Cosserat materials.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Shixiang Zhao, Yu. V. Petrov, Yuyi Zhang, G. A. Volkov, Zejian Xu, Fenglei Huang
Summary: This paper theoretically studies the thermal softening related to stress relaxation using the incubation time approach and examines the temperature-time correspondence. The developed relaxation model of plasticity (RP model) is analyzed and compared with other constitutive models and artificial neural networks. The advantages and disadvantages of different models are discussed, and the differences between the ANN model and other constitutive models are examined.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Ivan I. Argatov, Federico J. Sabina
Summary: This study models a seismic metabarrier as a cluster of single-degree-of-freedom resonator units and considers the scattering effects on pulsed Rayleigh waves caused by the vertical displacements of the resonators and the normal contact forces. The variation of the amplitude reduction factor due to the model parameters variation is studied in detail.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)