Author: tianli

Sheima, Yauhen published the artcileArtificial Muscles: Dielectric Elastomers Responsive to Low Voltages, Product Details of C17H28O8S4, the main research area is dielec elastomer permittivity thin film actuator artificial muscle; dielectric elastomer actuators; high permittivity elastomers; high permittivity polysiloxanes; thin films; thiol-ene addition.

The lack of soft high-dielec.-permittivity elastomers responsive to a low voltage was a long-standing obstacle for the industrialization of dielec. elastomer actuators (DEA) technol. Here, elastomers that not only possess a high dielec. permittivity of 18 and good elastic and insulating properties but are also processable in very thin films by conventional techniques are reported. Addnl., the elastic modulus can be easily tuned. A soft elastomer with a storage modulus of E = 350 kPa, a tan δ = 0.007 at 0.05 Hz, and a lateral actuation strain of 13% at 13 V μm-1 is prepared A stable lateral actuation over 50,000 cycles at 10 Hz is demonstrated. A stiffer elastomer with an E = 790 kPa, a tan δ = 0.0018 at 0.05 Hz, a large out-of-plane actuation at 41 V μm-1, and breakdown fields of almost 100 V μm-1 is also developed. Such breakdown fields are the highest ever reported for a high-permittivity elastomer. Addnl., actuators operable at a voltage â‰?00 V are also demonstrated. Because the materials used are cheap and easily available, and the chem. reactions leading to them allow upscaling, they have the potential to advance the DEA technol.

Macromolecular Rapid Communications published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Product Details of C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Liu, Haoran published the artcileAn electrically actuated soft artificial muscle based on a high-performance flexible electrothermal film and liquid-crystal elastomer, Computed Properties of 7575-23-7, the main research area is elec actuator soft artificial muscle flexible electrothermal film elastomer; flexible electrothermal film; high heating rate; high saturation temperature; soft artificial muscle; stable resistance.

Liquid-crystal elastomer (LCE)-based soft robots and devices via an electrothermal effect under a low driving voltage have attracted a great deal of attention for their ability on generating larger stress, reversible deformation, and versatile actuation modes. However, electrothermal materials integrated with LCE easily induce the uncertainty of a soft actuator due to the non-uniformity on temperature distribution, inconstant resistance in the deformation process, and slow responsivity after voltage on/off. In this paper, a low-voltage-actuated soft artificial muscle based on LCE and a flexible electrothermal film is presented. At 6.5 V, a saturation temperature of 189°C can be reached with a heating rate of 21°C/s, which allows the soft artificial muscle quick and significant contraction and is suitable for untethered operation. Meanwhile, uniform temperature distribution and stable resistance of the flexible electrothermal film in the deformation process are obtained, leading to a work d. of 9.97 kJ/m3, an actuating stress of 0.46 MPa, and controllable deformation of the soft artificial muscle. Finally, programmable low-voltage-controlled soft artificial muscles are fabricated by tailoring the flexible electrothermal film or designing structured heating pattern, including a prototype of soft finger-like gripper for transporting small objects, which clearly demonstrates the potential of low-voltage-actuated soft artificial muscles in soft robotics applications.

ACS Applied Materials & Interfaces published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Javed, Mahjabeen published the artcileProgrammable Shape Change in Semicrystalline Liquid Crystal Elastomers, Computed Properties of 7575-23-7, the main research area is programmable shape change semicrystalline liquid crystal elastomer; actuator; crystallization; liquid crystal elastomers; polymers; stimuli-responsive.

Liquid crystal elastomers (LCEs) are stimuli-responsive materials capable of reversible and programmable shape change in response to an environmental stimulus. Despite the highly responsive nature of these materials, the modest elastic modulus and blocking stress exhibited by these actuating materials can be limiting in some engineering applications. Here, we engineer a semicrystalline LCE, where the incorporation of semicrystallinity in a lightly cross-linked liquid crystalline network yields tough and highly responsive materials. Directed self-assembly can be employed to program director profiles through the thickness of the semicrystalline LCE. In short, we use the alignment of a liquid crystal monomer phase to pattern the anisotropy of a semicrystalline polymer network. Both the semicrystalline-liquid crystalline and liquid crystalline-isotropic phase transition temperatures provide controllable shape transformations. A planarly aligned sample’s normalized dimension parallel to the nematic director decreases from 1 at room temperature to 0.42 at 250°. The introduction of the semicrystalline nature also enhances the mech. properties exhibited by the semicrystalline LCE. Semicrystalline LCEs have a storage modulus of 390 MPa at room temperature, and monodomain samples are capable of generating a contractile stress of 2.7 MPa on heating from 25 to 50°, far below the nematic to isotropic transition temperature The robust mech. properties of this material combined with the high actuation strain can be leveraged for applications such as soft robotics and actuators capable of doing significant work.

ACS Applied Materials & Interfaces published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Sheima, Yauhen published the artcileTransient Elastomers with High Dielectric Permittivity for Actuators, Sensors, and Beyond, Computed Properties of 7575-23-7, the main research area is elastomer dielec permittivity actuator sensor; dielectric constant; high dielectric permittivity elastomers; low-voltage actuation; transient actuators; transient dielectrics; transient electronics; transient sensors.

Dielec. elastomers (DEs) are key materials in actuators, sensors, energy harvesters, and stretchable electronics. These devices find applications in important emerging fields such as personalized medicine, renewable energy, and soft robotics. However, even after years of research, it is still a great challenge to achieve DEs with increased dielec. permittivity and fast recovery of initial shape when subjected to mech. and elec. stress. Addnl., high dielec. permittivity elastomers that show reliable performance but disintegrate under normal environmental conditions are not known. Here, we show that polysiloxanes modified with amide groups give elastomers with a dielec. permittivity of 21, which is 7 times higher than regular silicone rubber, a strain at break that can reach 150%, and a mech. loss factor tan δ below 0.05 at low frequencies. Actuators constructed from these elastomers respond to a low elec. field of 6.2 V μm-1, giving reliable lateral actuation of 4% for more than 30 000 cycles at 5 Hz. One survived 450 000 cycles at 10 Hz and 3.6 V μm-1. The best actuator shows 10% lateral strain at 7.5 V μm-1. Capacitive sensors offer a more than a 6-fold increase in sensitivity compared to standard silicone elastomers. The disintegrated material can be re-crosslinked when heated to elevated temperatures In the future, our material could be used as dielec. in transient actuators, sensors, security devices, and disposable electronic patches for health monitoring.

ACS Applied Materials & Interfaces published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Wang, Meng published the artcileLiquid crystal elastomer actuator with serpentine locomotion, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is liquid crystal elastomer actuator serpentine locomotion.

A snake-mimic soft actuator composed of a bilayered liquid crystal elastomer ribbon and two serrated feet is reported in this work. Under repeated on/off near-IR light irradiation, this actuator can move forward relying on a reversible shape morphing between S-curve structure and reverse S-curve structure, which is similar to the serpentine locomotion of snakes.

Chemical Communications (Cambridge, United Kingdom) published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Zhang, Mingchao published the artcileLiquid-Crystal-Elastomer-Actuated Reconfigurable Microscale Kirigami Metastructures, Category: alcohols-buliding-blocks, the main research area is liquid crystal elastomer polyester polyether polythioester microscale kirigami metastructure; kirigami; liquid crystal elastomers; reconfigurable metastructures; two-photon polymerization; wireless microscale devices.

Programmable actuation of metastructures with predesigned geometrical configurations has recently drawn significant attention in many applications, such as smart structures, medical devices, soft robotics, prosthetics, and wearable devices. Despite remarkable progress in this field, achieving wireless miniaturized reconfigurable metastructures remains a challenge due to the difficult nature of the fabrication and actuation processes at the micrometer scale. Herein, microscale thermo-responsive reconfigurable metasurfaces using stimuli-responsive liquid crystal elastomers (LCEs) is fabricated as an artificial muscle for reconfiguring the 2D microscale kirigami structures. Such structures are fabricated via two-photon polymerization with sub-micrometer precision. Through rationally designed experiments guided by simulations, the optimal formulation of the LCE artificial muscle is explored and the relationship between shape transformation behaviors and geometrical parameters of the kirigami structures is build. As a proof of concept demonstration, the constructs for temperature-dependent switching and information encryption is applied. Such reconfigurable kirigami metastructures have significant potential for boosting the fundamental small-scale metastructure research and the design and fabrication of wireless functional devices, wearables, and soft robots at the microscale as well.

Advanced Materials (Weinheim, Germany) published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Roggatz, Christina C. published the artcileModelling Antifouling compounds of Macroalgal Holobionts in Current and Future pH Conditions, Recommanded Product: 17-Hydroxyheptadecanoic acid, the main research area is pH ocean acidification antifouling compound Rhodophyta Chlorophyta; Macroalgae; and macro-colonizers; antifouling; chemical communication; climate change; micro; ocean acidification.

Marine macroalgae are important ecosystem engineers in marine coastal habitats. Macroalgae can be neg. impacted through excessive colonization by harmful bacteria, fungi, microalgae, and macro-colonisers and thus employ a range of chem. compounds to minimize such colonization. Recent research suggests that environmental pH conditions potentially impact the functionality of such chem. compounds Here we predict if and how naturally fluctuating pH conditions and future conditions caused by ocean acidification will affect macroalgal (antifouling) compounds and thereby potentially alter the chem. defense mediated by these compounds We defined the relevant ecol. pH range, analyzed and scored the pH-sensitivity of compounds with antifouling functions based on their modelled chem. properties before assessing their distribution across the phylogenetic macroalgal groups, and the proportion of sensitive compounds for each investigated function. For some key compounds, we also predicted in detail how the associated ecol. function may develop across the pH range. The majority of compounds were unaffected by pH, but compounds containing phenolic and amine groups were found to be particularly sensitive to pH. Future pH changes due to predicted average open ocean acidification pH were found to have little effect. Compounds from Rhodophyta were mainly pH-stable. However, key algal species amongst Phaeophyceae and Chlorophyta were found to rely on highly pH-sensitive compounds for their chem. defense against harmful bacteria, microalgae, fungi, and biofouling by macro-organisms. All quorum sensing disruptive compounds were found the be unaffected by pH, but the other ecol. functions were all conveyed in part by pH-sensitive compounds For some ecol. keystone species, all of their compounds mediating defense functions were found to be pH-sensitive based on our calculations, which may not only affect the health and fitness of the host alga resulting in host breakdown but also alter the associated ecol. interactions of the macroalgal holobiont with micro and macrocolonisers, eventually causing ecosystem restructuring and the functions (e.g. habitat provision) provided by macroalgal hosts. Our study investigates a question of fundamental importance because environments with fluctuating or changing pH are common and apply not only to coastal marine habitats and estuaries but also to freshwater environments or terrestrial systems that are subject to acid rain. Hence, while warranting exptl. validation, this investigation with macroalgae as model organisms can serve as a basis for future investigations in other aquatic or even terrestrial systems.

Journal of Chemical Ecology published new progress about Acid rain. 13099-34-8 belongs to class alcohols-buliding-blocks, name is 17-Hydroxyheptadecanoic acid, and the molecular formula is C17H34O3, Recommanded Product: 17-Hydroxyheptadecanoic acid.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Pereira, Filipa published the artcileModel-guided development of an evolutionarily stable yeast chassis, Quality Control of 97-67-6, the main research area is transcriptome proteome metabolome succinate fumarate malate dehydrogenase Saccharomyces; adaptive laboratory evolution; chassis cell; metabolic engineering; multi-objective optimization; systems biology.

First-principle metabolic modeling holds potential for designing microbial chassis that are resilient against phenotype reversal due to adaptive mutations. Yet, the theory of model-based chassis design has rarely been put to rigorous exptl. test. Here, we report the development of Saccharomyces cerevisiae chassis strains for dicarboxylic acid production using genome-scale metabolic modeling. The chassis strains, albeit geared for higher flux towards succinate, fumarate and malate, do not appreciably secrete these metabolites. As predicted by the model, introducing product-specific TCA cycle disruptions resulted in the secretion of the corresponding acid. Adaptive laboratory evolution further improved production of succinate and fumarate, demonstrating the evolutionary robustness of the engineered cells. In the case of malate, multi-omics anal. revealed a flux bypass at peroxisomal malate dehydrogenase that was missing in the yeast metabolic model. In all three cases, flux balance anal. integrating transcriptomics, proteomics and metabolomics data confirmed the flux re-routing predicted by the model. Taken together, our modeling and exptl. results have implications for the computer-aided design of microbial cell factories.

Molecular Systems Biology published new progress about Metabolome. 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, Quality Control of 97-67-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Uda, Ryoko M. published the artcileMalachite green leuco derivatives as photobase generators for initiating crosslinking and polymerization, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is malachite green derivative photobase generator crosslinking anionic photopolymerization initiator.

We investigated the pH-changing profile induced by UV irradiation of malachite green leuco derivatives (MG-Xs) and performed polymerization and crosslinking reactions initiated by irradiated MG-Xs. A substituent (X) is covalently linked to the central carbon atom of malachite green, abbreviated as MG-OH or MG-OCH3. MG-Xs undergo photoionization to afford malachite green cations and anions (X-), which act as photobase generators. We found that MG-OCH3 was as effective as MG-OH for photoionization and photo-induced pH jumping. Anionic photo-polymerization of Me methacrylate was accomplished via irradiation of MG-Xs. Irradiation of MG-Xs triggered the base-promoted crosslinking reaction between pentaerythritol tetra(3-mercaptopropionate) and hexamethylene diisocyanate.

Materials Letters published new progress about Leuco dyes. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Han, Di published the artcileEngineering the Surface Pattern of Microparticles: From Raspberry-like to Golf Ball-like, Synthetic Route of 7575-23-7, the main research area is microparticle surface structure shape silsesquioxane; golf ball-like; microparticles; polyhedral oligomeric silsesquioxane; raspberry-like; thiol−epoxy polymerization.

Control of the shape and uniformity of colloid particles is essential for realizing their functionality in various applications. Herein, we report a facile approach for the synthesis of narrowly dispersed anisotropic microparticles with well-defined raspberry-like and golf ball-like surface patterns. First, we demonstrate that hybrid raspberry-like particles can be achieved through a one-pot polymerization method using glycidyl polyhedral oligomeric silsesquioxane (GPOSS) and pentaerythritol tetra(3-mercaptopropionate) (PETMP) as monomers. Varying the polymerization parameters such as catalyst loading, monomer concentration, and the molar ratio of monomers, we are able to regulate the sizes and surface protrusion numbers of these raspberry-like microparticles. The formation mechanism is attributed to a competition balance between thiol-epoxy reaction and thiol-thiol coupling reaction. The former promotes rapid formation of large core particles between PETMP and GPOSS droplets (which can serve as core particles), while the latter allows for generation of surface protrusions by PETMP self-polymerization, leading to the formation of raspberry-like surface patterns. Based on the different POSS contents in the surface protrusions and cores of the raspberry-like microparticles, we demonstrate that they can be used as precursors to produce microporous silica (sub)microparticles with golf ball-like morphol. via pyrolysis subsequently. Overall, this work provides a facile yet controllable approach to synthesize narrowly dispersed anisotropic microparticles with diverse surface patterns.

ACS Applied Materials & Interfaces published new progress about IR spectra. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts