Soft Matter
·
2019
·Vol. 15
·期 32
·6504-6517
·
IF 3.399
Caifen Lei,Qiang Li,Lu Yang,Fei Deng,Jianyao Li,Zihan Ye,Ying Wang,Zhenkun Zhang
Under external pressure compression, various kinds of artificial microcapsules can undergo buckling induced deformation and catastrophic rupturing failure, which needs to be understood for their diverse practical applications. For this, many theories and numerical simulations have recently emerged, leading to some intriguing but often debatable predictions and scaling laws. However, experimental testing of these predictions is very limited, due to challenges in realizing prescribed buckling pathways and in situ monitoring of the buckling procedure. Herein, we report the buckling behaviors of well-defined spherical polydopamine (PDA) capsules with tunable sizes and homogeneous nanoscale shells. Simple but controlled solvent evaporation was implemented inside a home-made optical chamber to induce buckling of PDA capsules by following a prescribed pathway toward targeted shapes that are only dictated by the inherent material properties of the capsules. In addition, the buckling speed was slowed down to the timescale of minutes, which can prevent buckling from being trapped at some metastable intermediate states as well as facilitating in situ optical monitoring of the whole buckling procedure in slow motion. In this way, several classic buckling behaviors were clearly observed, including the sudden appearance of spinodal-like dimples above critical pressures, transition of the indentation rim from the axisymmetric to polygonal shape, and evolution of multi-indented buckling into single indented buckling following Ostwald ripening. These observations are qualitatively comparable with recent predictions from numerical results. Furthermore, some novel buckling phenomena have been reported for the first time, which might stimulate further theories and numerical simulations.
研究领域:
材料科学
·
力学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2024
·
IF 4.2
Yanli Wang,Wenjing Qin,Xiang Zhou,Enzhao Liu,Yutian Zhu,Shougen Yin,Wenjin Guo,Zunfeng Liu
Flexible wearable sensors have the characteristics of flexibility, comfort, and wearability, and have shown great potential in future electronic products. Despite significant efforts in developing stretchable electronic materials and structures, the development of flexible strain sensors with a wide temperature range, high sensitivity, broad detection range, and good interface stability remains challenging. Here, strain sensors with buckled structures are fabricated using high and low-temperature resistant material Ti 3 C 2 T x MXene/graphene, PDMS 184. The conductive material Ti 3 C 2 T x MXene/graphene exhibits excellent interface interaction with PDMS 184, addressing not only the poor compatibility issue between the conductive material and the flexible substrate, but also demonstrating good stability and cycling performance. Buckled structure improves the stretchability and linearity of strain sensors. The fabricated strain sensor is suitable for a wide temperature range (−40 to 120 °C) and exhibits high stretchability (120% strain). The strain sensor demonstrates rapid response times at different temperatures: −40 (72.6 ms), 0 (62.7 ms), and 120 °C (52.7 ms). The strain sensor exhibits high sensitivity at different temperatures: −40 (GF = 0.38), 0 (GF = 0.24), 40 (GF = 0.66), and 120 °C (GF = 1.47). The strain sensor has a wide detection range (0.1% to 120%) and excellent cycling stability. In addition, Ti 3 C 2 T x MXene/graphene strain sensors can accurately capture various human activities, such as blinking, speaking, finger bending, and wrist bending.
研究领域:
材料科学
·
柔性电子
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Enze Wang,Zekun Chen,Run Shi,Zixin Xiong,Zeqin Xin,Bolun Wang,Jing Guo,Ruixuan Peng,Yonghuang Wu,Chenyu Li,Hongtao Ren,Xiaoyan Li,Kai Liu
Dynamic engineering of buckling deformation is of vital importance as it provides multiphase modulation of thin film devices. In particular, dynamic switch of buckles between one-dimensional (1D) and two-dimensional (2D) configurations in a single film system on rigid substrates is intriguing but very challenging. The current approach to changing buckling configuration is mainly achieved by varying the built-in stress at the film–substrate interface, but it is difficult to realize dynamic engineering on rigid substrates. Herein, we report a dynamic engineering of buckling deformation in MoS2 thin films by humidity-tuned interfacial adhesion. With the change of humidity, the MoS2 thin films deform from 1D telephone-cord buckles to 2D web-like buckles due to the hydrophilic nature of both MoS2 and substrate. Such 1D-to-2D evolution of buckles is attributed to the weakened interfacial adhesion of mixed deformation modes induced by humidity, which is verified by finite-element modeling. These buckled films further find potential applications as patterned templates for liquid condensation and sensing units for tactile sensors. Our work not only demonstrates the humidity-controlled dimensionality engineering of buckles in MoS2 thin films but also sheds light on the functional applications of buckled films based on their profile features.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 4
·2026-2039
·
IF 2.2
Bai Guangzhu,Chen Zhibin,Liu Jie,Wang Fang,Zhang Yusheng
Sintered foils are currently being considered as a promising material for anode foils in capacitors due to their high specific capacitance and anti-buckling performance, which meet the requirements for capacitor winding. In this article, sintered foils with added starch were produced using a protective atmosphere sintering process. The effect of starch addition in the range of 0–50 vol% on the specific capacitance and anti-buckling performance of the sintered foils was evaluated. Scanning electron microscope (SEM) analysis confirmed the formation of the pores in the sintered foils due to the addition of starch. These pores play a crucial role in improving the specific capacitance and enhancing the anti-buckling performance of the sintered foils. However, excessive amounts of starch can have a negative impact on the specific capacitance of the sintered foils which initially decreased, then increased, and finally decreased with increasing starch content. On the other hand, the anti-buckling performance increased with increasing starch content. At 30 vol% starch addition, a high specific capacitance of 0.886 μ F/cm 2 and an anti-buckling performance of more than 120 times were obtained, meeting the requirements for anode foils in aluminum electrolytic capacitors. The specific capacitance of the sintered foils was predicted using the close-packed packing model, which can help establish a powder metallurgy method for preparing anode foil materials with high specific capacitance and anti-buckling performance for aluminum electrolytic capacitors. Graphical
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 4
·458
·
IF 2.935
Wenhua Jing,Sinan Du,Zexin Zhang
Shape is an essential property of polymeric particles. Herein, we propose a simple method to synthesize polymeric particles with a well-controlled concave shape. Our method takes advantage of the powerful seeded emulsion polymerization strategy with the well-known principle of “like dissolves like” in solvent chemistry. We first prepared polystyrene (PS) particles with a single dimple by seeded emulsion polymerization. Then the dimpled PS particles were dispersed in a dimethylformamide (DMF) and water mixture. Consequently, the non-crosslinked polymer chains inside the particle were dissolved by DMF, a good solvent for PS, and the PS chains migrated out of the particle, causing buckling of the dimple and enlargement of the concave. By systematic change of the fraction of DMF in the solvent mixture, we changed the amount of the dissolved PS chains, and achieved polymeric particles with precisely tuned degree of concaveness. These concave particles were found to readily self-assemble, driven by polymer-induced depletion interaction. The concave PS particles reported here provide potential building blocks for self-assembled polymeric materials, and new model systems for condensed matter research.Keywords:concave particle;seeded emulsion polymerization;good solvent;buckling;self-assembly;depletion interaction
研究领域:
材料科学
·
化学工程
·
凝聚态物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Technological Sciences
·
2024
·Vol. 67
·期 9
·2954-2964
·
IF 4.4
Yang WenGuang,Wang WenHao,Teng XiangYu,Qiao ZeZheng,Yu HaiBo
The development of microengineered hydrogels has opened up unlimited possibilities for designing complex structures at the microscale. In this study, we constructed an origami-inspired tubular structure with controlled mechanical buckling based on optically induced electrokinetics (OEK). By inducing a stress gradient in the thickness, a tubular structure can be formed from a poly(ethylene glycol) diacrylate (PEGDA) hydrogel film of various shapes that have been custom fabricated. To achieve an ideal three-dimensional (3D) structure, the amplitude of the tubular structure can be controlled by adjusting the aspect ratios or polymerization time. Furthermore, the tubular structure can be manipulated for the collection and transportation of microspheres. In summary, we provide an effective method for designing 3D structures at the micro-nano scale. This forming method holds great potential for achieving various functions in tissue engineering, drug packaging, and transportation in the future.
研究领域:
生物工程
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jinzhu Zou,Huiwen Xiong,Yujuan Huang,Kechao Zhou,Dou Zhang
Porous zirconia with different porosity and pore architecture were prepared by adjusting the solid loading and the binder concentration of the suspensions, and freezing rate via an ice-templating method. The transition of the fracture mode and the relationship between the compressive strength and process parameters were identified and investigated. The load-displacement curves showed a variation from a buckling fracture at porosity above 70 % to a brittle fracture in the porosity range from 35.3 % to 55.5 %, owning to the increased resistance of the ceramic walls to buckling. As the porosity decreased from 75.0 % to 35.3 %, the mean compressive strength of the samples increased from 4.5 MPa to 197.1 MPa. Under buckling fracture, increasing the binder concentration from 2 wt% to 4 wt% contributed to the improvement of the mean compressive strength from 5.5 MPa to 14.8 MPa, although samples had similar porosity level (~73 %). For brittle fracture, samples with porosity around 54 % exhibited the improvement of mean compressive strength from 45.5 MPa to 75.1 MPa when increasing the freeze velocity from 8 °C/min to 25 °C/min.
研究领域:
材料科学
·
陶瓷
·
力学性能
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2021
·Vol. 17
·期 47
·10696-10702
·
IF 3.679
Longfei Luo,Chengcheng Liang,Hong Zhang,Yiwu Zong,Kun Zhao
Anisotropic colloidal particles with concave and convex structures are useful in both theoretical studies and applications. In this work, we mass-produced polystyrene (PS) colloidal particles with multiple concavities through dispersion polymerization techniques. By increasing the delayed feeding time td of the cross-linker divinylbenzene (DVB), the morphological evolution of particles can be classified into two stages, during which the formation of different concavities is consistent with either the buckling mechanism or phase separation mechanism. By varying the DVB dosage, we found that the size of the big chamber formed on the particle surfaces decreases as the DVB dosage increases. Then, using these concave particles as seeds, 2–5 μm anisotropic colloids with various shapes, including spherical, ellipsoidal, snowman and multi-protrusion, were synthesized by seeded emulsion polymerization. Moreover, our results show that both the chambers and long narrow ditches on the surface of seeds can be the active sites for monomers to gather and polymerize, but monomers in the big chamber have a priority to polymerize first when big and small concavities both exist on seeds. The results of this study could mean great potential in synthesizing a variety of anisotropic particles with well-controlled concave morphologies.
研究领域:
材料科学
·
化学工程
·
胶体化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 25
·2212246
·
IF 29.4
Qingshan Wu,Hao Yan,Lie Chen,Shuanhu Qi,Tianyi Zhao,Lei Jiang,Mingjie Liu
Hydrodynamic forces from moving fluids can be utilized to remove contaminants which is an ideal fouling-release strategy for underwater surfaces. However, the hydrodynamic forces in the viscous sublayer are greatly reduced owing to the no-slip condition, which restricts their practical applications. Here, inspired by sweeper tentacles of corals, an active self-cleaning surface with flexible filament-like sweepers are reported. The sweepers can penetrate the viscous sublayer by utilizing energy from outer turbulent flows and remove contaminants with adhesion strength of >30 kPa. Under an oscillating flow, the removal rate of the single sweeper can reach up to 99.5% due to dynamic buckling movements. In addition, the sweepers array can completely clean its coverage area within 10 s through coordinated movements as symplectic waves. The active self-cleaning surface depends on the fluid-structure coupling between sweepers and flows, which breaks the concept of conventional self-cleaning.
研究领域:
材料科学
·
生物力学
·
流体力学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Matter
·
2025
·
IF 17.5
Xi Xia,Xingxing Chen,Junli Shi,Zhibin Li,Bingfa Jiang,Kaixi Huang,Mengxue Guo,Zeyun Yang,Zelong Liao,Chaoyang Song,Chuan Fei Guo
Skin-like sensors are key for humanoid robots and wearables. Achieving both robust interfaces and promoted sensing performances in soft sensors may enable their applications in extreme mechanical conditions of high shear. However, strong interfacial adhesion in multilayer sensors often compromise sensing properties. Here, we design hyperbranched polyurethane micropillars with (diameter < length of flaw sensitivity) that serve dual roles as an adhesion layer for exceptional mechanical stability, and adaptive spacer for enhanced sensing properties. We show a strong size effect of the structure to toughen the interface, with ultrahigh interfacial toughness up to 5,095 J m −2 at a 50-μm pillar diameter. Simultaneously, the micropillars enhance sensitivity and limit of detection by decreasing the stiffness via elastic buckling and enable a rapid response to the acoustic range by reducing energy loss during loading and unloading. The sensors are ideal for the manipulation of heavy objects in humanoid robots and other applications.
研究领域:
材料科学
·
机器人学
·
传感器技术
·
机械工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Ruijue Cao,Guancong Chen,Linhong Wang,Wang Wang,Chujun Ni,Zhuoheng Xia,Anni Hu,Wei Hu,Hailu Lin,Pengxu Qian,Fan Yang,Qian Zhao
Controllable tissue expansion is critical in regenerative medicine to address skin or mucosal defects. Tissue expanders based on isotropic water filling or swelling offer a clinical solution but face challenges in addressing individual anatomical complexities. Here, a 4D printing biocompatible hydrogel expander with customizable designs is reported. Water-swellable polymer sheets with non-swellable elastomer frameworks are synthesized via digital photocuring. The sheets buckle upon adsorption of tissue fluids to execute anisotropic and programmable morphing, forming predesigned 3D structures with time as the fourth dimension for the shape changing. With an initial thickness of 1.0 mm, which is remarkably thinner than previous devices (typically 3–5 mm), the expander enabled minimally invasive implantation in the rat scalp. After 5 days’ implantation, the skin area and weight respectively increase to two and three folds without tissue damage, illustrating that the buckling-based strategy provides a safer yet accelerated expansion effect over previous devices. RNA sequencing indicates that the buckling-induced regeneration involving epithelial-to-mesenchymal transition (EMT) may be affected by the PI3K-AKT pathway. This work provides an inspiring strategy for personalized regeneration medicine.
研究领域:
再生医学
·
生物医学工程
·
4D打印
·
组织工程
·
水凝胶技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）