902 results match your criteria thermally responsive

Development of Thermally Responsive PolyNIPAm Microcarrier for Application of Cell Culturing-Part I: A Feasibility Study.

Polymers (Basel) 2021 Aug 7;13(16). Epub 2021 Aug 7.

Department of Chemical and Environmental Engineering, University of Nottingham China, 199 Taikang East Road, Ningbo 315100, China.

Poly(-isopropylacrylamide) (polyNIPAm) microspheres were synthesized via the suspension polymerization technique. Thermal and redox initiators were compared for the polymerization, in order to study the effect of initiator type on the surface charge and particle size of polyNIPAm microspheres. The successful polymerization of NIPAm was confirmed by FTIR analysis. Read More

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Tumor microenvironment-responsive nanozymes achieve photothermal-enhanced multiple catalysis against tumor hypoxia.

Acta Biomater 2021 Aug 15. Epub 2021 Aug 15.

Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, National & Local United Engineering Laboratory for Power Batteries, Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province, Analysis and Testing Center, Department of Chemistry, Northeast Normal University, Changchun, Jilin Province 130024, China. Electronic address:

Reactive oxygen species (ROS)-mediated antitumor modalities that induced oxidative damage of cancer cells have recently acquired increasing attention on account of their noninvasiveness, low systemic toxicity, and high specificity. However, their clinical efficacy was often constrained by complex and various tumor microenvironment (TME), especially hypoxia characteristic and antioxidation effect of glutathione (GSH). Herein, we constructed a multinanozyme system based on hyaluronic acid (HA)-stabilized CuMnO nanoparticles (CMOH) loaded with indocyanine green (ICG) with high-efficient ROS generation, O self-evolving function, GSH depletion ability and hyperthermia effect for achieving hypoxic tumor therapy. Read More

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Microphase Separation of Resilin-like and Elastin-like Diblock Copolypeptides in Concentrated Solutions.

Biomacromolecules 2021 Sep 13;22(9):3827-3838. Epub 2021 Aug 13.

Department of Mechanical Engineering & Materials Science, Duke University, Durham, North Carolina 27708, United States.

Diblock copolymers are valued for their ability to form thin films with nanoscale features that typically reflect those of their microphase-separated structures in concentrated solution. Here, we show that such self-assembled structures can be easily formed with diblock copolymers composed of thermally responsive polypeptides, such as resilin-like polypeptides (RLP) and elastin-like polypeptides (ELP), by exploiting the inverse temperature transition behavior of ELPs in aqueous media. Specifically, we examine the self-assembly of a series of RLP--ELP diblock copolypeptides in concentrated aqueous solution (30 and 50 wt %) by small-angle X-ray scattering (SAXS). Read More

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September 2021

Nanomaterials-assisted thermally induced neuromodulation.

Biomed Eng Lett 2021 Aug 11;11(3):163-170. Epub 2021 Jun 11.

Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141 Republic of Korea.

Neuromodulation, as a fast-growing technique in neuroscience, has been a great tool in investigation of the neural pathways and treatments for various neurological disorders. However, the limitations such as constricted penetration depth, low temporal resolution and low spatial resolution hindered the development and clinical application of this technique. Nanotechnology, which refers to the technology that deals with dimension under 100 nm, has greatly influenced the direction of scientific researches within recent years. Read More

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Hybrid Self-Assembled Gel Beads for Tuneable pH-Controlled Rosuvastatin Delivery.

Chemistry 2021 Sep 19;27(52):13203-13210. Epub 2021 Aug 19.

Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.

This article describes the fabrication of new pH-responsive hybrid gel beads combining the polymer gelator calcium alginate with two different low-molecular-weight gelators (LMWGs) based on 1,3 : 2,4-dibenzylidene-d-sorbitol: pH-responsive DBS-COOH and thermally responsive DBS-CONHNH , thus clearly demonstrating that different classes of LMWG can be fabricated into gel beads by using this approach. We also demonstrate that self-assembled multicomponent gel beads can be formed by using different combinations of these gelators. The different gel bead formulations exhibit different responsiveness - the DBS-COOH network can disassemble within those beads in which it is present upon raising the pH. Read More

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September 2021

Digital light processing of liquid crystal elastomers for self-sensing artificial muscles.

Sci Adv 2021 Jul 23;7(30). Epub 2021 Jul 23.

Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.

Artificial muscles based on stimuli-responsive polymers usually exhibit mechanical compliance, versatility, and high power-to-weight ratio, showing great promise to potentially replace conventional rigid motors for next-generation soft robots, wearable electronics, and biomedical devices. In particular, thermomechanical liquid crystal elastomers (LCEs) constitute artificial muscle-like actuators that can be remotely triggered for large stroke, fast response, and highly repeatable actuations. Here, we introduce a digital light processing (DLP)-based additive manufacturing approach that automatically shear aligns mesogenic oligomers, layer-by-layer, to achieve high orientational order in the photocrosslinked structures; this ordering yields high specific work capacity (63 J kg) and energy density (0. Read More

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Thermally-modulated cell separation columns using a thermoresponsive block copolymer brush as a packing material for the purification of mesenchymal stem cells.

Biomater Sci 2021 Jul 23. Epub 2021 Jul 23.

Faculty of Pharmacy, Keio University, 1-5-30 Shibakoen, Minato, Tokyo 105-8512, Japan.

Cell therapy using mesenchymal stem cells (MSCs) is used as effective regenerative treatment. Cell therapy requires effective cell separation without cell modification and cellular activity reduction. In this study, we developed a temperature-modulated mesenchymal stem cell separation column. Read More

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Sample-to-Answer Diagnostic System for the Detection of Circulating Histones in Whole Blood.

ACS Sens 2021 08 16;6(8):3006-3012. Epub 2021 Jul 16.

Fischell Department of Bioengineering, University of Maryland, College Park 20740, United States.

Severe internal trauma results in millions of hospitalizations each year, including thousands of deaths caused by subsequent multiple organ failure. The majority of these deaths occur within the first 24 h, and thus, rapid diagnosis of internal trauma severity is necessary for immediate treatment. For early organ damage identification, diagnosis in point-of-care settings is crucial for rapid triage and treatment. Read More

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Biocompatible Wax-Based Microcapsules with Hermetic Sealing for Thermally Triggered Release of Actives.

ACS Appl Mater Interfaces 2021 Aug 13;13(30):36380-36387. Epub 2021 Jul 13.

Soft Matter and Functional Interfaces Laboratory, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongsangbuk-do 37673, South Korea.

We present a microfluidic approach that utilizes temperature-responsive and biocompatible palm oil as the shell material in microcapsules to simultaneously achieve hermetic sealing as well as on-demand temperature-triggered release of the encapsulated actives. Unlike common paraffin waxes (e.g. Read More

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Interpenetrating polysaccharide-based hydrogel: A dynamically responsive versatile medium for precisely controlled synthesis of nanometals.

Mater Sci Eng C Mater Biol Appl 2021 Aug 27;127:112211. Epub 2021 May 27.

Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials &Application, Key Laboratory of Textile Fiber & Product, Ministry of Education, Wuhan Textile University, Wuhan 430200, China. Electronic address:

Herein, we reported an interpenetrating polysaccharide-based hydrogel in which carboxymethyl chitosan (CMC) chains were physically dispersed throughout the thermoplastic elastomer gel network has been developed as a versatile platform for precisely controlled synthesis of nanometals. Results indicated the interpenetrated CMC chains could serve as multifunctional fillers for metal ions adsorption and stabilization while the thermally reconfigurable agarose (Agar) gel medium provides three-dimensional semi-solid framework for entrapping and recollecting of the fabricated nanometals. Specifically, the CMC chains were found to strongly coordinate with silver ions as a dynamically responsive metal-biopolymer complex within the bulk gel network as confirmed by the enhanced mechanical properties and regulated shape memory performances. Read More

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Photo-induced ultralong phosphorescence of carbon dots for thermally sensitive dynamic patterning.

Chem Sci 2021 May 10;12(23):8199-8206. Epub 2021 May 10.

School of Chemistry and Chemical Engineering, Nanjing University 163 Xianlin Road Nanjing 210023 China

Stimuli-responsive films with a dynamic long afterglow feature have received considerable attention in the field of optical materials. Herein, we report the unique dynamic ultralong room temperature phosphorescence (URTP) in flexible solid films made of luminescent carbon dots (CDs) and polyvinylpyrrolidone (PVP). Impressively, fully reversible photo-activation and thermal deactivation of the dynamic long afterglow was achieved in this material, with a lifetime on-off ratio exceeding 3900. Read More

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Understanding functional group and assembly dynamics in temperature responsive systems leads to design principles for enzyme responsive assemblies.

Nanoscale 2021 Jul;13(26):11568-11575

Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA.

Understanding the molecular rules behind the dynamics of supramolecular assemblies is fundamentally important for the rational design of responsive assemblies with tunable properties. Herein, we report that the dynamics of temperature-sensitive supramolecular assemblies is not only affected by the dehydration of oligoethylene glycol (OEG) motifs, but also by the thermally-promoted molecular motions. These counteracting features set up a dynamics transition point (DTP) that can be modulated with subtle variations in a small hydrophobic patch on the hydrophilic face of the amphiphilic assembly. Read More

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Tailoring the optical and dynamic properties of iminothioindoxyl photoswitches through acidochromism.

Chem Sci 2021 Feb 9;12(12):4588-4598. Epub 2021 Feb 9.

University Medical Center Groningen, Department of Radiology, Medical Imaging Center, University of Groningen Hanzeplein 1 9713 GZ Groningen The Netherlands

Multi-responsive functional molecules are key for obtaining user-defined control of the properties and functions of chemical and biological systems. In this respect, pH-responsive photochromes, whose switching can be directed with light and acid-base equilibria, have emerged as highly attractive molecular units. The challenge in their design comes from the need to accommodate application-defined boundary conditions for both light- and protonation-responsivity. Read More

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February 2021

Magnetic Dynamic Polymers for Modular Assembling and Reconfigurable Morphing Architectures.

Adv Mater 2021 Jul 19;33(30):e2102113. Epub 2021 Jun 19.

Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH, 43210, USA.

Shape-morphing magnetic soft materials, composed of magnetic particles in a soft polymer matrix, can transform shape reversibly, remotely, and rapidly, finding diverse applications in actuators, soft robotics, and biomedical devices. To achieve on-demand and sophisticated shape morphing, the manufacture of structures with complex geometry and magnetization distribution is highly desired. Here, a magnetic dynamic polymer (MDP) composite composed of hard-magnetic microparticles in a dynamic polymer network with thermally responsive reversible linkages, which permits functionalities including targeted welding for magnetic-assisted assembly, magnetization reprogramming, and permanent structural reconfiguration, is reported. Read More

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Time-Programmed Delivery of Sorafenib and Anti-CD47 Antibody via a Double-Layer-Gel Matrix for Postsurgical Treatment of Breast Cancer.

Nanomicro Lett 2021 Jun 12;13(1):141. Epub 2021 Jun 12.

College of Life Science and Technology, National Engineering Research Center for Nanomedicine, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China.

The highly immunosuppressive microenvironment after surgery has a crucial impact on the recurrence and metastasis in breast cancer patients. Programmable delivery of immunotherapy-involving combinations through a single drug delivery system is highly promising, yet greatly challenging, to reverse postoperative immunosuppression. Here, an injectable hierarchical gel matrix, composed of dual lipid gel (DLG) layers with different soybean phosphatidylcholine/glycerol dioleate mass ratios, was developed to achieve the time-programmed sequential delivery of combined cancer immunotherapy. Read More

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Enhanced Thermal Conductivity in Oriented Polyvinyl Alcohol/Graphene Oxide Composites.

ACS Appl Mater Interfaces 2021 Jun 8;13(24):28864-28869. Epub 2021 Jun 8.

Laboratory of Stimuli-responsive Functional Materials & Devices (SFD), Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands.

Polymer composites have attracted increasing interest as thermal management materials for use in devices owing to their ease of processing and potential lower costs. However, most polymer composites have only modest thermal conductivities, even at high concentrations of additives, resulting in high costs and reduced mechanical properties, which limit their applications. To achieve high thermally conductive polymer materials with a low concentration of additives, anisotropic, solid-state drawn composite films were prepared using water-soluble polyvinyl alcohol (PVA) and dispersible graphene oxide (GO). Read More

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Nanocellulose-Assisted Thermally Induced Growth of Silver Nanoparticles for Optical Applications.

ACS Appl Mater Interfaces 2021 Jun 7;13(23):27696-27704. Epub 2021 Jun 7.

Deutsches Elektronen-Synchrotron DESY, Ein Forschungszentrum der Helmholtz-Gemeinschaft, Notkestraße 85, 22607 Hamburg, Germany.

Optically responsive materials are present in everyday life, from screens to sensors. However, fabricating large-area, fossil-free materials for functional biocompatible applications is still a challenge today. Nanocelluloses from various sources, such as wood, can provide biocompatibility and are emerging candidates for templating organic optoelectronics. Read More

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Thermally treated zeolitic imidazolate framework-8 (ZIF-8) for visible light photocatalytic degradation of gaseous formaldehyde.

Chem Sci 2020 May 21;11(26):6670-6681. Epub 2020 May 21.

School of Energy and Environment, City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China +852 3442 0688 +852 3442 7714.

The development of wide-spectrum responsive photocatalysts for efficient formaldehyde (HCHO) removal is highly desired yet remains a great challenge. Here we successfully converted zeolitic imidazolate framework-8 (ZIF-8), one of the most well-studied metal-organic frameworks (MOFs), from routine ultraviolet-driven to novel broad-spectrum-driven photocatalyst a facile thermal treatment. The isocyanate groups (-N[double bond, length as m-dash]C[double bond, length as m-dash]O) formed in the thermally treated ZIF-8 (ZIF-8-T) is crucial in enabling the superior photocatalytic performance in formaldehyde degradation. Read More

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ABC triblock bottlebrush copolymer-based injectable hydrogels: design, synthesis, and application to expanding the therapeutic index of cancer immunochemotherapy.

Chem Sci 2020 Jun 1;11(23):5974-5986. Epub 2020 Jun 1.

Department of Chemistry, Massachusetts Institute of Technology Massachusetts 02139 USA

Bottlebrush copolymers are a versatile class of macromolecular architectures with broad applications in the fields of drug delivery, self-assembly, and polymer networks. Here, the modular nature of graft-through ring-opening metathesis polymerization (ROMP) is exploited to synthesize "ABC" triblock bottlebrush copolymers (TBCs) from polylactic acid (PLA), polyethylene glycol (PEG), and poly(-isopropylacrylamide) (PNIPAM) macromonomers. Due to the hydrophobicity of their PLA domains, these TBCs self-assemble in aqueous media at room temperature to yield uniform ∼100 nm micelles that can encapsulate a wide range of therapeutic agents. Read More

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Genetically Encoded Elastin-Like Polypeptides for Drug Delivery.

Adv Healthc Mater 2021 07 3;10(13):e2100209. Epub 2021 Jun 3.

Department of Biomedical Engineering, Duke University, Durham, NC, 277018, USA.

Elastin-like polypeptides (ELPs) are thermally responsive biopolymers that consist of a repeated amino acid motif derived from human tropoelastin. These peptides exhibit temperature-dependent phase behavior that can be harnessed to produce stimuli-responsive biomaterials, such as nanoparticles or injectable drug delivery depots. As ELPs are genetically encoded, the properties of ELP-based biomaterials can be controlled with a precision that is unattainable with synthetic polymers. Read More

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Remote Performance Modulation of Ultrafiltration Membranes by Magnetically and Thermally Responsive Polymer Chains.

Membranes (Basel) 2021 May 4;11(5). Epub 2021 May 4.

Ralph E Martin Department of Chemical Engineering, University of Arkansas, Fayettteville, AR 72701, USA.

Ultrafiltration membranes, that respond to an external magnetic field and local temperature have been developed. Surface-initiated activator-generated electron transfer (AGET) atom transfer radical polymerization (ATRP) has been used to graft poly(N-isopropylacrylamide) (PNIPAm) from the surface of 300 kDa regenerated cellulose membranes. The polymerization initiator was selectively attached to the entire membrane surface, only the outer membrane surface or only the inner pore surface. Read More

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Solid Multiresponsive Materials Based on Nitrospiropyran-Doped Ionogels.

ACS Appl Mater Interfaces 2021 Jun 31;13(22):26461-26471. Epub 2021 May 31.

Departament de Química, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain.

The application of molecular switches for the fabrication of multistimuli-responsive chromic materials and devices still remains a challenge because of the restrictions imposed by the supporting solid matrices where these compounds must be incorporated: they often critically affect the chromic response as well as limit the type and nature of external stimuli that can be applied. In this work, we propose the use of ionogels to overcome these constraints, as they provide a soft, fluidic, transparent, thermally stable, and ionic-conductive environment where molecular switches preserve their solution-like properties and can be exposed to a number of different stimuli. By exploiting this strategy, we herein pioneer the preparation of nitrospiropyran-based materials using a single solid platform that exhibit optimal photo-, halo-, thermo-, and electrochromic switching behaviors. Read More

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Upper Critical Solution Temperature-Type Responsive Cyclodextrins with Characteristic Inclusion Abilities.

Chemistry 2021 Jul 7;27(40):10470-10476. Epub 2021 Jun 7.

International Joint Laboratory of Biomimetic and Smart Polymers, School of Materials Science and Engineering, Shanghai University, Materials Building Room 801, Nanchen Street 380, Shanghai, 200444, P. R. China.

Water-soluble and thermoresponsive macrocycles with stable inclusion toward guests are highly valuable to construct stimuli-responsive supramolecular materials for versatile applications. Here, we develop such macrocycles - ureido-substituted cyclodextrins (CDs) which exhibit unprecedented upper critical solution temperature (UCST) behavior in aqueous media. These novel CD derivatives showed good solubility in water at elevated temperature, but collapsed from water to form large coacervates upon cooling to low temperature. Read More

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Switchable Self-Assembly of Elastin- and Resilin-Based Block Copolypeptides with Converse Phase Transition Behaviors.

ACS Appl Mater Interfaces 2021 Jun 18;13(21):24385-24400. Epub 2021 May 18.

Department of Bionano Engineering and Department of Bionanotechnology, Center for Bionano Intelligence Education and Research, Hanyang University, Ansan 15588, Republic of Korea.

Self-assembly of thermally responsive polypeptides into unique nanostructures offers intriguing attributes including dynamic physical dimensions, biocompatibility, and biodegradability for the smart bio-nanomaterials. As elastin-based polypeptide (EBP) fusion proteins with lower critical solution temperature (LCST) are studied as drug delivery systems, EBP block copolypeptides with the resilin-based polypeptide (RBP) displaying an upper critical solution temperature (UCST) have been of great interest. In this study, we report thermally triggered, dynamic self-assembly of EBP- and RBP-based diblock copolypeptides into switched nanostructures with reversibility under physiological conditions. Read More

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Thermally responsive reduced graphene oxide with electroactive functionality for controllable electroanalysis.

Talanta 2021 Aug 5;231:122368. Epub 2021 Apr 5.

College of Chemistry, Liaoning University, Shenyang, 110036, China; Yingkou Institute of Technology, Yingkou, 115014, China. Electronic address:

A thermally responsive hybrid poly(NIPAm-b-BVIm[FcCOO])-rGO composed of block co-polymer poly(NIPAm-b-BVImBr), reduced graphene oxide (rGO) and electroactive anions was designed and synthesized to achieve electroactive functionality. It is the polymeric ionic liquids (PILs) segment in the block co-polymer that integrated the three different components into a whole hybrid. Such segment of PILs could not only promote the modification of polar PNIPAm onto the non-polar rGO by cation-π interaction, but also realize the immobilization of ferrocenecarboxylate anion (FcCOO) via anion-exchange reaction. Read More

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Drug Release from Thermo-Responsive Polymer Brush Coatings to Control Bacterial Colonization and Biofilm Growth on Titanium Implants.

Adv Healthc Mater 2021 06 5;10(11):e2100069. Epub 2021 May 5.

Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering (Cµ), Department of Chemistry and Biology, School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, Siegen, 57076, Germany.

Despite decades of biomedical advances, the colonization of implant devices with bacterial biofilms is still a leading cause of implant failure. Clearly, new strategies and materials that suppress both initial and later stage bacterial colonization are required in this context. Ideal would be the implementation of a bactericidal functionality in the implants that is temporally and spatially triggered in an autonomous fashion at the infection site. Read More

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Temperature-Controlled Reconfigurable Nanoparticle Binary Superlattices.

ACS Nano 2021 05 3;15(5):8466-8473. Epub 2021 May 3.

Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015-4791, United States.

The presence of diffusionless transformations during the assembly of DNA-functionalized particles (DFPs) is highly significant in designing reconfigurable materials whose structure and functional properties are tunable with controllable variables. In this paper, we first use a variety of computational models and techniques (including free energy methods) to address the nature of such transformations between face-centered cubic (FCC) and body-centered cubic (BCC) structures in a three-dimensional binary system of multiflavored DFPs. We find that the structural rearrangements between BCC and FCC structures are thermodynamically reversible and dependent on crystallite size. Read More

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NIR-vis-UV Light-Responsive High Stress-Generating Polymer Actuators with a Reduced Creep Rate.

Macromol Rapid Commun 2021 Jul 3;42(14):e2100157. Epub 2021 May 3.

Laboratory of Stimuli-Responsive Functional Materials & Devices (SFD), Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, 5612 AZ, Eindhoven, The Netherlands.

Untethered, light-responsive, high-stress-generating actuators based on widely-used commercial polymers are appealing for applications in soft robotics. However, the construction of actuators that are stable and reversibly responsive to low-intensity ultraviolet, visible, and infrared lights remains challenging. Here, transparent, stress-generating actuators are reported based on ultradrawn, ultrahigh molecular weight polyethylene films. Read More

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Self-sustained eversion or inversion of a thermally responsive torus.

Phys Rev E 2021 Mar;103(3-1):033004

Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, USA.

When a cylindrical rod is placed on a flat and hot surface with a constant temperature, it can reach a steady state after certain time. In the steady state, though the temperature field inside the rod is inhomogeneous, it does not change with time. The inhomogeneous temperature change in the rod may induce inhomogeneous thermal expansion in it. Read More

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Surface Activity and Structure of Temperature-Responsive Polymer Surfactants Based on PNIPAm at the Air/Solution Interface.

Langmuir 2021 Apr 6;37(15):4632-4638. Epub 2021 Apr 6.

Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China.

Thermally sensitive polymers have attracted tremendous interest in the design of stimulus-responsive surfactants. In this article, poly(propylene oxide)--poly(-isopropylacrylamide) (PPO--PNIPAm) with different block lengths of PNIPAm was synthesized through atom transfer radical polymerization (ATRP). Different from commercial Pluronic surfactants, four distinct sections appeared in the decrease of surface tension with concentration. Read More

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