Sensors and Actuators B Chemical, Год журнала: 2023, Номер 400, С. 134877 - 134877
Опубликована: Окт. 31, 2023
Язык: Английский
Advanced Materials, Год журнала: 2025, Номер unknown
Опубликована: Янв. 19, 2025
Abstract Nature provides many examples of the benefits nanoscopic surface structures in areas adhesion and antifouling. Herein, design, fabrication, characterization liquid crystal elastomer (LCE) films are presented with nanowire that exhibit tunable stimuli‐responsive deformations enhanced properties. The LCE shown to curl toward side nanowires when stimulated by heat or organic solvent vapors. In contrast, a droplet same is placed on film, it curls away from due nanowire‐induced capillary forces cause unequal swelling. This characteristic curling deformation be reversible can optimized match curved substrates, maximizing adhesive shear forces. By using chemical modification, given underwater superoleophobicity, enabling oil repellency under range harsh conditions. combined frictional asymmetry shape create an mixing robot, capable performing reactions aqueous environments. These findings demonstrate potential nanowire‐augmented for advanced applications soft robotics, adaptive adhesion, easy implications designing responsive materials integrate mechanical flexibility functionality.
Язык: Английский
Процитировано
2
ACS Nano, Год журнала: 2024, Номер 18(36), С. 24682 - 24704
Опубликована: Авг. 26, 2024
Smart polymeric switchable adhesives represent a rapidly emerging class of advanced materials, exhibiting the ability to undergo on-demand transitioning between "On" and "Off" adhesion states. By selectively tuning external stimuli triggers (including temperature, light, electricity, magnetism, chemical agents), we can engineer these materials reversible changes in their bonding capabilities. The strategic design selection is pivotal factor adhesive systems. This review outlines recent advancements field smart over past decade with focus on stimulus triggers. These systems are further categorized into one four switching mechanisms upon initiation by specific stimuli-trigger: (i) interfacial adhesion, (ii) stiffness, (iii) contact area, or (iv) suction-based switching. Evaluation performance across primarily made based three key metrics: maximum strength, switch ratio, time. Different offer distinct advantages limitations, influencing characteristics applicability domains such as detachable biomedical devices, robotic grippers, climbing robots. thus offers perspective present challenges this field, along insights future directions.
Язык: Английский
Процитировано
7
Small, Год журнала: 2024, Номер unknown
Опубликована: Окт. 21, 2024
Abstract As actuated devices become smaller and more complex, there is a need for smart materials structures that directly function as complete mechanical units without an external power supply. The strategy uses light‐powered, twisted, coiled azobenzene‐functionalized semicrystalline liquid crystal elastomer (AC‐LCE) springs. This twisting coiling, which has previously been used only thermally, electrochemically, or absorption‐powered muscles, maximizes uniaxial radial actuation. specially designed photochemical muscles can undergo about 60% tensile stroke provide 15 kJ m −3 of work capacity in response to light, thus providing three times two higher performance, respectively, than previous azobenzene actuators. Since this actuation photochemical, driven by ultraviolet (UV) light reversed visible isothermal occur range environmental conditions, including underwater. In addition, photoisomerization the AC‐LCEs enables unique latch‐like actuation, eliminating continuous energy application maintain stroke. Also, light‐powered processed be either homochiral heterochiral, direction reversed. presented approach highlights novel capabilities actuator manipulated untethered, isothermal, wet suggesting various potential applications, underwater soft robotics.
Язык: Английский
Процитировано
5
Nanomaterials, Год журнала: 2025, Номер 15(6), С. 443 - 443
Опубликована: Март 14, 2025
The chemical response of liquid crystal elastomers (LCEs) offers substantial potential for applications in propulsion systems, micromechanical and active smart surfaces. However, the shape-changing behaviors LCEs to organic (isotropic) solvents remain scarcely explored, with most research focusing on (anisotropic) solvents. Herein, we prepared a series aligned varying crosslink densities using surface alignment technique combined an aza-Michael addition reaction, aiming investigate their swelling different isotropic We found that rates shape volume variation modes, elastic modulus LCEs, polarity solvent all significantly influence behavior. Specifically, when swell acetone, dimethylformamide (DMF), ethyl acetate, contraction occurs along direction. Conversely, extension direction is observed toluene, anisole, acrylic acid. Meanwhile, perpendicular noted nearly These changes can be attributed phase transitions LCEs. This not only provides valuable insights into mechanisms but also holds great promise development sensors gas sensing applications.
Язык: Английский
Процитировано
0
Journal of Materials Chemistry A, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
A synchronous differential orientation strategy was proposed for the fabrication of programmable liquid crystal elastomers with aid dual dynamic covalent bonds, which are composed boronic ester bonds and siloxane bonds.
Язык: Английский
Процитировано
0
Macromolecular Rapid Communications, Год журнала: 2025, Номер unknown
Опубликована: Апрель 2, 2025
Liquid crystalline polymer networks (LCNs) and liquid elastomers (LCEs) possess unique properties that enable structural deformation in response to external stimuli such as temperature, light, electric fields. These deformations occur across a wide range of scales, from nanometers macroscopic scales. This review aims comprehensively address the actuation mechanisms observed LCN LCE-based structures various First, phenomena are explored at nanoscale investigate potential applications these nanodevices systems. Next, microscale, presenting case studies involving micro-robotics micro-actuators, analyzed. Finally, it is examined how macroscale can be utilized large systems, macro devices soft robotics. By investigating scale-dependent characteristics, this paper provides an integrated perspective on LCE research, emphasizing their transformative for next-generation applications.
Язык: Английский
Процитировано
0
ACS Catalysis, Год журнала: 2024, Номер 14(22), С. 17090 - 17102
Опубликована: Ноя. 6, 2024
Enzyme immobilization into carrier materials has broad importance in biotechnology, yet understanding the catalysis of enzymes bound to solid surfaces remains challenging. Here, we explore surface effects on sucrose phosphorylase through a fusion protein approach. We immobilize enzyme via structurally rigid α-helical linker [EA3K]n tunable spacer length due variable number pentapeptide repeats used (n = 6, 14, 19). Molecular modeling and simulation approaches delineate conformational space sampled by each relative its His-tag cap for tethering. The population distribution conformers gets broader, with consequent shift enzyme-to-surface distance larger values (≤15 nm), as increases. Based temperature kinetic studies, obtain an energetic description enzyme-to-linker fusions solution Ni2+-chelate agarose. solid-supported involve distinct changes enthalpy–entropy partitioning within frame invariant Gibbs free energy activation (ΔG‡ ∼61 kJ/mol at 30 °C). entropic contribution (−TΔS‡) ΔG‡ increases length, from −16.4 linker-free +7.9 [EA3K]19 linked fusion. immobilized is indistinguishable catalytic properties solution, which behave identically regardless their linker. Enzymes positioned closer arguably experience higher degree molecular organization ("rigidification") that must relax additional uptake heat, compensated gain entropy. Increased thermostability these (up 2.8-fold) consistent proposed rigidification effect. Collectively, our study reveals parameters shows dependence surface-tethering fundamental insight here obtained, together successful extension principle different (nigerose phosphorylase), suggests linker-based control protein–surface can be engineering strategy optimize activity characteristics enzymes.
Язык: Английский
Процитировано
1
Sensors and Actuators B Chemical, Год журнала: 2023, Номер 400, С. 134877 - 134877
Опубликована: Окт. 31, 2023
Язык: Английский
Процитировано
2