Month: December 2022

Dobson, Adam L. published the artcileCombined Dynamic Network and Filler Interface Approach for Improved Adhesion and Toughness in Pressure-Sensitive Adhesives, Category: alcohols-buliding-blocks, the main research area is network filler adhesion toughness pressure sensitive adhesive; adhesive; covalent adaptable network; dynamic covalent chemistry; fatigue; pressure-sensitive adhesive; toughness.

Of importance for adhesive materials, particularly pressure-sensitive adhesive (PSA) systems, is the ability to increase bulk toughness without reduction of adhesion. Previous approaches for increasing PSA durability sacrifice permanent crosslinking or adhesive potential, limiting performance. In this work, covalent adaptable networks (CANs) derived from thiol-thioester exchange (TTE) are utilized as a basis for adhesive films. Tensile and single-lap shear tests were conducted for adhesive materials containing no filler, 15 weight % nanoparticles functionalized with thioester-containing acrylate, or 15 weight % nanoparticles functionalized with nonthioester-containing acrylate. Addnl., fatigue experiments were conducted on unfilled adhesives. Results indicate that TTE improves toughness, adhesion, and fatigue in unfilled materials. Filled adhesives with activated TTE showed a nearly fourfold increase in adhesion with slightly reduced toughness compared to uncatalyzed filled specimens. This work has implications in many industries, from biomedical to automotive, as toughness and fatigue resistance are important considerations for adhesive applications.

ACS Applied Polymer Materials published new progress about Adhesion, physical. 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

Tian, Hongmiao published the artcileAn electrically active gecko-effect soft gripper under a low voltage by mimicking gecko’s adhesive structures and toe muscles, HPLC of Formula: 7575-23-7, the main research area is liquid crystal elastomer film mimicking gecko adhesive structure toe.

With the combination of the passive adhesion generated by micro/nano-structures at their feet and the active mech. stimulus of their toe muscles, geckos can stably walk on vertical walls and horizontal ceilings. Inspired by such stimuli-responsive systems in nature, an active adhesive soft gripper stimulated by low voltage (usually ≤6 V), consisting of a passive mushroom-like adhesive structure and an elec. active liquid crystal elastomer working as toe muscles, is proposed in this study. Through voltage on/off switching, reversible deformation can be generated for switchable adhesion, where high adhesion can be achieved under the action of a preload force accompanied by a 0 V voltage and low adhesion can be obtained under an exerted voltage. This gecko-inspired soft gripper was tested and found to be successful as a transport device for gripping/releasing objects with different features, such as a glass ball, a sample bottle, and a steel weight To the best of our knowledge, the present study is the first to propose an elec. active gecko-inspired soft gripper for transferring objects with different surfaces by the control of low voltage, processing great application potential in industrial lines and daily life and providing a novel perspective on soft gripper design.

Soft Matter published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, HPLC of Formula: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kim, Soyoun published the artcileModulation of Interfacial Adhesion Using Semicrystalline Shape-Memory Polymers, COA of Formula: C17H28O8S4, the main research area is interfacial adhesion semicrystalline shape memory polymer.

Semicrystalline shape-memory elastomers are molded into deformable geometrical features to control adhesive interactions between elastomers and a glass substrate. By mech. and thermally controlling the deformation and phase-behavior of molded features, we can control the interfacial contact area and the interfacial adhesive force. Results indicate that elastic energy is stored in the semicrystalline state of deformed features and can be released to break attractive interfacial forces, automatically separating the glass substrate from the elastomer. Our findings suggest that the shape-memory elastomers can be applied in various contact printing applications to control adhesive forces and delamination mechanics during ink pickup and transfer.

Langmuir published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, COA of Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Wang, Mingjia published the artcilePurified fraction of polysaccharides from Fuzhuan brick tea modulates the composition and metabolism of gut microbiota in anaerobic fermentation in vitro, Recommanded Product: (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, the main research area is polysaccharide Fuzhuan brick tea gut microbiota anaerobic fermentation metabolism; Fuzhuan brick tea; Gut microbiota; KEGG pathway; Metagenomics; Polysaccharide.

One purified fraction from crude Fuzhuan brick tea polysaccharides (FBTPS), FBTPS-3, was obtained through column chromatog. of DEAE Sepharose Fast Flow. The chem. properties and probiotic effects of FBTPS-3 were evaluated by fermentation in vitro. Moreover, the effects of FBTPS-3 on the function and metabolic pathway of gut microbiota were investigated by metagenomic sequencing. The results showed that FBTPS-3 was an heteropolysaccharide with mol. weight of 741 kDa, which was mainly composed of Man, Rha, GalA, Gal and Ara in molar ratio of 8.7:15.5:42.2:19.7:13.9. The contents of carbohydrates and uronic acid in FBTPS-3 were 44.78 ± 2.85% and 40.4 ± 2.11%, resp. After fermentation, the mol. weight of FBTPS-3 and content of carbohydrates were significantly decreased, indicating that FBTPS-3 could be utilized by gut microbiota. Furthermore, the relative abundances of Bacteroides, Megasphaera and Prevotella were significantly increased by FBTPS-3. FBTPS-3 also significantly promoted the production of acetic, propionic and n-butyric acids. Based on the metagenomic sequencing, it was found that FBTPS-3 significantly enriched the metabolic pathway of starch and sucrose. All the results suggest that FBTPS-3 is expected to be developed as functional ingredients or foods to improve the host health through regulating the gut microbiota and physiol. metabolic functions.

International Journal of Biological Macromolecules published new progress about Acidaminococcaceae. 59-23-4 belongs to class alcohols-buliding-blocks, name is (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, and the molecular formula is C6H12O6, Recommanded Product: (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Hashemi, Seyed Mohammad Bagher published the artcileBasil seed gum edible films incorporated with Artemisia sieberi and Achillea santolina essential oils: Physical, antibacterial, and antioxidant properties, Application In Synthesis of 124-76-5, the main research area is Artemisia Achillea antibacterial antioxidant essential oil basil seed gum.

Active edible films were prepared by incorporating Artemisia sieberi and Achillea santolina essential oils (EOs) in basil seed gum (BSG) films. The results showed an increase in opacity, contact angel, and water vapor permeability of the films by the addition of EOs, whereas the moisture content, water absorption capacity, and water solubility declined. The presence of EOs significantly improved the DPPH and ABTS radical scavenging activities of BSG films. The agar diffusion disk method was carried out to evaluate the antibacterial activity of the films against Staphylococcus aureus, Bacillus cereus, Listeria monocytogenes, Shigella dysenteriae, Salmonella Typhi, and Pseudomonas aeruginosa. BSG film containing A. santolina + A. sieberi (1:2 volume/volume) demonstrated the highest antibacterial activity against the selected bacteria. It can be concluded that BSG film loaded with A. santolina + A. sieberi (1:2 volume/volume) EOs have the potential to be used as an active edible film and improve the shelf life of food products by delaying the oxidation and the microbial growth. Novelty impact statement : Active edible films were prepared by incorporation of Artemisia sieberi and Achillea santolina essential oils (EO) into basil seed gum (BSG) films. EOs significantly increased the opacity, water contact angel, and water vapor permeability of BSG films. Films incorporated with the mixture of EOs (A. santolina + A. sieberi (1:2 volume/volume)) showed the highest antibacterial and antioxidant activities. BSG films that contained these EOs have the potential to be used as active packaging to increase the shelf life of food products.

Journal of Food Processing and Preservation published new progress about Achillea santolina. 124-76-5 belongs to class alcohols-buliding-blocks, name is rel-(1R,2R,4R)-1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol, and the molecular formula is C10H18O, Application In Synthesis of 124-76-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

He, Jia published the artcileHighly Sensitive Temperature Sensor Based on Cascaded Polymer-Infiltrated Fiber Mach-Zehnder Interferometers Operating near the Dispersion Turning Point, Related Products of alcohols-buliding-blocks, the main research area is sensor cascaded polymer Mach Zehnder interferometer dispersion turning point; dispersion turning point; femtosecond laser micromachining; fiber interferometer; optical fiber sensor; temperature measurement.

High-accuracy temperature measurement plays a vital role in biomedical, oceanog., and photovoltaic industries. Here, a highly sensitive temperature sensor is proposed and demonstrated based on cascaded polymer-infiltrated Mach-Zehnder interferometers (MZIs), operating near the dispersion turning point. The MZI was constructed by splicing a half-pitch graded index fiber (GIF) and two sections of single-mode fiber and creating an inner air cavity based on femtosecond laser micromachining. The UV-curable polymer-infiltrated air cavity functioned as one of the interference arms of MZI, and the residual GIF core functioned as the other. Two MZIs with different cavity lengths and infiltrated with the UV-curable polymers, having the refractive indexes on the different sides of the turning point, were created. Moreover, the effects of the length and the bending way of transmission SMF between the first and the second MZI were studied. As a result, the cascaded MZI temperature sensor exhibits a greatly enhanced temperature sensitivity of -24.86 nm/°C based on wavelength differential detection. The aforementioned result makes it promising for high-accuracy temperature measurements in biomedical, oceanog., and photovoltaic applications.

Polymers (Basel, Switzerland) published new progress about Absorption spectra. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Oh-e, Masahito published the artcileInteractions Between Hydrated Cerium(III) Cations and Carboxylates in an Aqueous Solution: Anomalously Strong Complex Formation with Diglycolate, Suggesting a Chelate Effect, Safety of 2,2′-Oxydiacetic acid, the main research area is hydrated cerium cation carboxylate aqueous solution; anomalously strong complex diglycolate chelate.

Interactions between hydrated Ce3+ and various carboxylates are of fundamental interest. Anomalously strong interactions with Ce3+ occur when diglycolic acid (DGA) is added into a Ce3+ aqueous solution, unlike various other carboxylic acids. Herein, the complex-formation constants of Ce3+ with these acids are evaluated via absorption and emission spectra. Hydrated Ce3+ emits fluorescence with unity quantum yield; however, addition of various carboxylates statically quenches the fluorescence when Ce3+-carboxylate complexes form because the fluorescence lifetime is constant irresp. of the carboxylate concentration In the observed static quenching, the complex-formation constants obtained from the absorption and emission spectra (Kabs and Kem) agree well. The binding of Ce3+ by the conjugate Lewis bases, i.e., carboxylates, is approx. inversely proportional to the pH. Adding DGA into the system also statically quenches the fluorescence, but far more efficiently, even in a much weaker solution We rigorously deduce Kabs and Kem of Ce3+ with DGA without any approximation using comparable concentrations Careful fittings provide equivalent Kem and Kabs values, and by varying the pH and ionic strength, we confirm that this equivalence is an inherent property of the Ce3+-DGA system. The Lewis acid-base theory cannot explain why DGA binds to Ce3+ ~1000 times more strongly than the other carboxylates. This anomalously strong binding may be due to a chelate effect caused by the DGA’s central oxygen atom, which forms a five-membered ring with the conjugate Lewis bases of DGA; double chelate rings can also form, while bis-deprotonated DGA binds to Ce3+, facilitated by the central oxygen. Therefore, DGA enables efficient quenching through the chelate effect when it binds to Ce3+.

ACS Omega published new progress about Absorption spectra. 110-99-6 belongs to class alcohols-buliding-blocks, name is 2,2′-Oxydiacetic acid, and the molecular formula is C4H6O5, Safety of 2,2′-Oxydiacetic acid.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Furuyama, Taniyuki published the artcileCationic axial ligands on sulfur substituted silicon(IV) phthalocyanines: improved hydrophilicity and exceptionally red-shifted absorption into the NIR region, SDS of cas: 2212-32-0, the main research area is sulfur silicon phthalocyanine hydrophilicity absorption.

Herein, we report the exceptionally red-shifted absorption of sulfur-substituted silicon(IV) phthalocyanines upon introduction of cationic axial ligands. The Q band was red-shifted to approx. 900 nm with improved hydrophilicity by the combination of peripheral sulfur substituents and axial ammonium ligands. One such phthalocyanine exhibited remarkable photocytotoxicity upon irradiation with NIR light (∼810 nm) in live cells.

Chemical Communications (Cambridge, United Kingdom) published new progress about Absorption spectra. 2212-32-0 belongs to class alcohols-buliding-blocks, name is N2-(2-Hydroxyethyl)-N1,N1,N2-trimethyl-1,2-ethylenediamine, and the molecular formula is C7H18N2O, SDS of cas: 2212-32-0.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Reedy, E. D. Jr. published the artcileInterfacial toughness: dependence on surface roughness and test temperature, COA of Formula: C4H11NO2, the main research area is aluminum epoxy interface surface roughness temperature.

Abstract: Interfacial toughness quantifies resistance to crack growth along an interface and in this investigation the toughness of an aluminum/epoxy interface was measured as a function of surface roughness and test temperature The large strain response of the relatively ductile epoxy adhesive used in this study was also characterized. This epoxy adhesive exhibits intrinsic strain-softening after initial compressive yield and then deforms plastically at a roughly constant flow stress until it rapidly hardens at large compressive strains. We find that interface toughness scales as the product of the temperature dependent epoxy yield strength and a length scale that characterizes surface roughness. The proposed scaling is based upon dimensional considerations of a model problem that assumes that the characteristic length scale of both the roughness and the crack-tip yield zone is small relative to the region dominated by the linear elastic asymptotic crack-tip stress field. Furthermore, the model assumes that interfacial failure occurs only after the epoxy begins to harden at large strains. The proposed relationship is validated by our interfacial toughness measurements.

International Journal of Fracture published new progress about Interface roughness. 22483-09-6 belongs to class alcohols-buliding-blocks, name is 2,2-Dimethoxyethanamine, and the molecular formula is C4H11NO2, COA of Formula: C4H11NO2.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Thompson, Chase B. published the artcileGradient supramolecular interactions and tunable mechanics in polychaete jaw inspired semi-interpenetrating networks, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is gradient supramol tunable polychaete jaw semi IPN; zinc benzimidazolylpyridine terminated ethylene butylene copolymer.

Polychaete worms display a remarkable jaw structure, where a gradient in metal-ligand coordination down the length of the jaw results in a shift from hard to soft mechanics. To mimic these gradient structures, a Zn-coordinated supramol. polymer is crosslinked into a covalent matrix to afford supramol. semi-interpenetrating networks (SIPNs). These SIPN materials exhibit improved mechanics with a lower supramol. content (30 wt%), allowing for energy dissipation through cavitation to increase material toughness. The shift in mech. behavior is further attributed to the morphol., where the size of the phase-separated droplets and nature of the continuous phase in these SIPNs contributes to the material mechanics. Furthermore, chem. gradients are applied to these systems through exposure to a competitive ligand, offering control over the localization of supramol. interactions. These materials offer a framework to mediate mechanics while maintaining the ability to program gradient supramol. interactions.

European Polymer Journal published new progress about Elongation at break. 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