Author: tianli

Wang, Yunpeng published the artcileLiquid Crystal Elastomer Twist Fibers toward Rotating Microengines, HPLC of Formula: 7575-23-7, the main research area is liquid crystal elastomer twist fiber preparation rotating microengine property; liquid crystal elastomers; rotating microengines; smart materials; stimuli-responsiveness; twist fibers.

Untethered twist fibers do not require end-anchoring structures to hold their twist orientation and offer simple designs and convenient operation. The reversible responsiveness of these fibers allows them to generate torque and rotational deformation continuously upon the application of external stimuli. The fibers therefore have potential in rotating microengines. In practical applications, high torque and rotational deformation are desirable to meet work capacity requirements. However, the simultaneous endowment of reversible responsiveness and high rotational performance to untethered twist fibers remains a challenge. In this study, a liquid crystal elastomer twist fiber (LCETF) is designed and developed with a fixed twisting alignment of mesogens to provide untethered and reversible responsiveness. Outstanding rotational performance can be achieved when the mesogenic orientation is disrupted through heat triggering. Owing to the significant intrinsic contractile ratio of the LCE material, the rotational deformation of the LCETF can reach 243.6° mm-1. More importantly, the specific torque can reach 10.1 N m kg-1, which exceeds previously reported values. In addition, the LCETF can be exploited in a rotating microengine to convert heat into electricity with an induction voltage as high as 9.4 V. This work broadens the applications of LCEs for energy harvesters, micromachines, and soft robots.

Advanced Materials (Weinheim, Germany) published new progress about Birefringence. 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

Li, Ying published the artcileMicroscopic ordered structure compactness and intrinsic thermal conductivity improvement of dispersed liquid crystal films of flexible epoxy-thiol polymers, Synthetic Route of 7575-23-7, the main research area is epoxy thiol flexible polymer liquid crystal film dispersibility; thermal mech property.

Flexible epoxy-thiol polymers were fabricated by the reaction between N,N-diglycidyl-4-glycidyloxyaniline (NDGA), poly(propylene glycol)diglycidyl ether (PGDE) and thiol curing agent with different functionality including 3,6-dioxa-1,8-octanedithiol (DET), pentaerythritol tetra(3-mercaptopropionate) (PETMP) and trimethylolpropane tris(3-mercaptopropionate) (TTMP). Liquid crystal monomer (LCM) was uniformly dispersed into epoxy-thiol polymers to prepare dispersed liquid crystal films of flexible epoxy-thiol polymers (E-PDLC films). The elongation at break and tensile strength of E-PDLC films increased to 195.9% and 25 MPa resp. LCM showed favorable dispersibility and maintain ordered orientation of liquid crystal in E-PDLC films. The degree of order in mol. chain of epoxy-thiol polymers was increased, and chain interaction of epoxy-thiol polymers and LCM was enhanced by hydrogen-bonding. In E-PDLC films, with different thiol curing agent and LCM addition, different microscopic-ordered structure formed: ordered-layered structures and denser squamous ordered structures. Both of these two microscopic-ordered structures formed by different thiol curing agent and the addition of LCM, and afforded continuous phonon transfer paths. The thermal conductivity of E-PDLC films is up to 0.70 W m-1 K-1. This work offered a new way to design flexible epoxy resin and intrinsic thermal conductive polymers.

Materials Today Communications published new progress about Birefringence. 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

Martinez, Alina M. published the artcilePermanent and reversibly programmable shapes in liquid crystal elastomer microparticles capable of shape switching, Computed Properties of 7575-23-7, the main research area is liquid crystal elastomer microparticle thiol Michael dispersion polymerization.

Reversibly programmable liquid crystal elastomer microparticles (LCEMPs), formed as a covalent adaptable network (CAN), with an average diameter of 7μm ± 2μm, were synthesized via a thiol-Michael dispersion polymerization The particles were programmed to a prolate shape via a photoinitiated addition-fragmentation chain-transfer (AFT) exchange reaction by activating the AFT after undergoing compression. Due to the thermotropic nature of the AFT-LCEMPs, shape switching was driven by heating the particles above their nematic-isotropic phase transition temperature (TNI). The programmed particles subsequently displayed cyclable two-way shape switching from prolate to spherical when at low or high temperatures, resp. Furthermore, the shape programming is reversible, and a second programming step was done to erase the prolate shape by initiating AFT at high temperature while the particles were in their spherical shape. Upon cooling, the particles remained spherical until addnl. programming steps were taken. Particles were also programmed to maintain a permanent oblate shape. Addnl., the particle surface was programmed with a diffraction grating, demonstrating programmable complex surface topog. via AFT activation.

Soft Matter published new progress about Birefringence. 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

Shivaraja, S. J. published the artcileFaster switching polymer dispersed liquid crystal devices incorporated with functionalized SWCNTs, Category: alcohols-buliding-blocks, the main research area is carbon nanotube polymer dispersed liquid crystal electrooptical property.

Polymer dispersed liquid crystals (PDLCs) were fabricated using acrylate-based UV curable monomer and a low birefringent nematic liquid crystal, 5PCH, by polymerization induced phase separation method. The effect of ODA-SWCNT dispersion on electro-optical properties of PDLC was investigated and compared with the undoped PDLC. The total response time reduces by 70%, and threshold voltage decreases by 42% in PDLC prepared with 0.015 wt% ODA-SWCNT nanocomposites of 5PCH, compared to the PDLC prepared with pure 5PCH. The optical transparency and sharpness of the image in ON-state was found to be remarkably better in the ODA-SWCNT incorporated PDLC as compared to the PDLC prepared with pure 5PCH.

Journal of Molecular Liquids published new progress about Birefringence. 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

Plohl, Olivija published the artcileMesoporous silica nanoparticles modified with N-rich polymer as a potentially environmentally-friendly delivery system for pesticides, Quality Control of 42822-86-6, the main research area is mesoporous silica nanoparticle nitrogen polymer pesticide.

The focus of the article is on the design of environmentally-friendly nanocarriers for improved controlled pesticide release, which have low environmental toxicity and nitrogen elemental composition as the most important components of fertilizers. In this study, a novel delivery system was developed for post-loading a biopesticide to mesoporous silica nanoparticles (MeSiNPs) functionalized with N-rich derived polymer. Initially, MeSiNPs were synthesized by the template-assisted method, which yielded MeSiNPs in the nm range, together with highly ordered mesoporous channels with a pore size of 2.9 nm. Subsequently, the water-soluble branched polyethyleneimine (bPEI) was derived systematically with epoxy organosilicate, and functionalized on MeSiNPs to create a source of N-nutrients. The carefully designed novel nano-carrier was analyzed by several physicochem. and structural analyses, which confirmed the successful attachment of the derived bPEI to MeSiNPs. Further, the novel nano-synthesized system was used as a delivery for the model biopesticide citridiol. The loading efficiency of citridiol in/on MeSiNPs@bPEI was 19%, while the loading capacity of citridiol was proven to be 5 mg biopesticide/1 mg MeSiNPs@bPEI. The MeSiNPs@bPEI with loaded citridiol was investigated for kinetic release. The system showed a fast initial release behavior in the first 300 min, which was continued by slow release behavior and started to reach equilibrium after 10 days. It has been shown that the MeSiNPs@bPEI showed an excellent potential for use in agrochem. applications, not only as a nanocarrier for controlled and slow pesticide release, but may also act as a soil improver by providing Si and N as key nutrient sources.

Microporous and Mesoporous Materials published new progress about Biopesticides. 42822-86-6 belongs to class alcohols-buliding-blocks, name is 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol, and the molecular formula is C10H20O2, Quality Control of 42822-86-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Miro Specos, Maria M. published the artcileApplication of microencapsulated biopesticides to improve repellent finishing of cotton fabrics, Computed Properties of 42822-86-6, the main research area is microencapsulated biopesticide repellent finishing cotton fabric.

Insect repellent textiles are currently being investigated as a complementary tool to control disease vectors, such as mosquitoes. The application of microencapsulated biopesticides to textiles is a promising low-toxicity alternative to other control methods, as microcapsules may prolong the release of the repellent agent. In this work, microcapsules containing two biopesticides, namely citronella essential oil and citriodiol were prepared and applied to cotton textiles using a variety of techniques. The aim of this work was to evaluate these functional textiles to select the most efficient, durable systems. Citriodiol-treated cotton presented a prolonged durability, and 100% repellency could be achieved for more than 30 days after padding onto cotton fabrics. It has to be pointed out that all these repellent textiles have been obtained by scalable, low-cost methods which would require no addnl. investment for textile finishing industries.

Journal of the Textile Institute published new progress about Biopesticides. 42822-86-6 belongs to class alcohols-buliding-blocks, name is 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol, and the molecular formula is C10H20O2, Computed Properties of 42822-86-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Hoeglund, Martin published the artcileTransparent Wood Biocomposites by Fast UV-Curing for Reduced Light-Scattering through Wood/Thiol-ene Interface Design, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is transparent wood biocomposites fast UV Curing reduced Light Scattering; cellulose; debonding; haze; optical properties; polymer composite.

Transparent wood (TW) is an interesting polymer biocomposite with potential for buildings and photonics applications. TW materials need to be eco-friendly and readily processed with few defects, for high optical transmittance and low transmission scattering at wide angles (haze). Two wood templates with different lignin-content are impregnated with a new thiol-ene thermoset system. The more eco-friendly bleached wood template results in transparent wood with high optical transmission and much reduced transmission haze, due to strong reduction of interfacial air gaps. Characterization includes template composition, thiol-ene distribution, and polymerization in wood cell wall by EDX and confocal Raman microscopy, also NMR and DSC, tensile testing and FE-SEM fractog. for morphol. and wood/thiol-ene interface adhesion assessment. The wood template is a true nanocomposite with thiol-ene polymer located inside the nanoporous wood cell wall. Advanced TW applications require not only appropriate wood template modification and careful polymer matrix selection but also tailoring of the process to impregnation and polymerization mechanisms, in order to reduce optical defects.

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

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Hoang, Stephane published the artcileMicrofluidic Assisted Flash Precipitation of Photocrosslinkable Fluorescent Organic Nanoparticles for Fine Size Tuning and Enhanced Photoinduced Processes, SDS of cas: 7575-23-7, the main research area is microfluidic assisted flash precipitation photocrosslinkable fluorescent organic nanoparticle; fluorescent organic nanoparticles; microfluidics; photochemistry; photophysics; size and control modulation.

Highly concentrated dispersions of fluorescent organic nanoparticles (FONs), broadly used for optical tracking, bioimaging and drug delivery monitoring, are obtained using a newly designed micromixer chamber involving high impacting flows. Fine size tuning and narrow size distributions are easily obtained by varying independently the flow rates of the injected fluids and the concentration of the dye stock solution The flash nanopptn. process employed herein is successfully applied to the fabrication of bicomposite FONs designed to allow energy transfer. Considerable enhancement of the emission signal of the energy acceptors is promoted and its origin is found to result from polarity rather than steric effects. Finally, we exploit the high spatial confinement encountered in FONs and their ability to encapsulate hydrophobic photosensitizers to induce photocrosslinking. An increase in the photocrosslinked FON stiffness is evidenced by measuring the elastic modulus at the nanoscale using at. force microscopy. These results pave the way toward the straightforward fabrication of multifunctional and mech. photoswitchable FONs, opening novel opportunities in sensing, multimodal imaging, and theranostics.

ChemPhysChem published new progress about Biocomposites. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, SDS of cas: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Tan, En Hui published the artcileDownstream drug product processing of itraconazole nanosuspension: Factors influencing tablet material properties and dissolution of compacted nanosuspension-layered sugar beads, Application of (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, the main research area is itraconazole nanosuspension drug processing dissolution layered sugar bead; Compaction; Copovidone (PubChem CID: 270885); Crospovidone (PubChem CID: 6917); Dibasic calcium phosphate (PubChem CID: 24441); Downstream processing; Formulation; Hydroxy propyl methyl cellulose (PubChem CID: 57503849); Hydroxypropyl cellulose (PubChem CID: 71306830); Isomalt (PubChem CID: 3034828); Itraconazole (PubChem CID: 55283); Microcrystalline cellulose (PubChem CID: 14055602); Multiparticulate oral dosage forms; Nano milling; Nanoparticles; Nanosuspensions; Nanotechnology; Pellet layering; Poly ethylene glycol (PubChem CID: 174); Poor solubility; Processing; Sodium dodecyl sulfate (PubChem CID: 3423265).

There has been limited research done on the downstream processing of nanosuspensions into solid oral dosage forms. This paper demonstrates the bead layering process with a layering level at 150% and 240%, as well as the selection and justification of the outer phase excipients for tabletability and disintegrating properties. In a previous study, an itraconazole nanosuspension stabilized by SDS and HPMC E5 was layered onto sugar beads with coating polymer HPMC VLV. In the current study, compression studies with these layered beads utilizing the small bead size at 150% or 240% layering levels with outer phase cushioning excipients MCC, copovidone or isomalt were performed. Other excipients such as co-compressed crospovidone-PEG 4000; DCP functioning as a disintegrant; and HPC as a binder was also added. Target output variables were achieved with a balance between an adequate tensile strength and fast dissolution rate with a release of 99.0% (±1.0% SD) within 10 min, which is in accordance with the FDA guidance for dissolution testing. The results show that the compaction of nanosuspension-layered beads is a suitable process for processing an itraconazole nanosuspension into a solid dosage form such as a compacted tablet without compromising on drug release.

International Journal of Pharmaceutics (Amsterdam, Netherlands) published new progress about Beads (sugar). 64519-82-0 belongs to class alcohols-buliding-blocks, name is (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, and the molecular formula is C12H24O11, Application of (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Goni, Miguel A. published the artcileThe diagenetic behavior of cutin acids in buried conifer needles and sediments from a coastal marine environment, Name: 17-Hydroxyheptadecanoic acid, the main research area is cutin acid diagenesis coastal sediment; diagenesis cutin acid forest litter; conifer needle cutin acid composition; fatty acid diagenesis needle sediment.

Whole green, litter, and sedimentary fir, hemlock, and cedar needles and bulk sediments collected from the Dabob Bay region in Washington State were analyzed for their cutin-derived CuO reaction products. All samples yielded dihydroxyhexadecanoic acid isomers (x,ω-C16), 16-hydroxyhexadecanoic acid (ω-C16), 14-hydroxytetradecanoic acid (ω-C14), and 18-hydroxyoctadec-9-enoic acid (ω-C18:1) as the major cutin acids. Fir/hemlock needle mixtures were characterized by a high abundance of the 9,16-dihydroxyhexadecanoic acid positional isomer, while cedar needles produced primarily the 10,16-dihydroxy counterpart. Cutin acids accounted for ∼3% of tissue C in green needles, ∼4% in needle litter, 0.5-1.5% in sedimentary needles, and ∼0.1% of the organic C (OC) in bulk sediments. Approx. 80% of the original cutin acids in fresh green needles were lost from the deepest (∼100 yr old) sedimentary tissues. Cutin was more active than lignin and polysaccharides, but more stable than the cyclitol components of the same needles. Comparative diagenetic losses of the individual cutin acids were not uniform and suggest that addnl. hydroxy groups and the presence of C double bonds both increase overall reactivity. The relative stability series derived for all the mol. constituents measured is: total vanillyl phenols > total p-hydroxy phenols, ferulic acid, most aldoses, bulk organic matter > mannose, ω-C14, ω-C16 ≥ ω-C18:1 > glucose, p-coumaric acid, x,ω-C16 > all cyclitols. Diagenetically induced changes in the various cutin parameters used to characterize nonwoody vascular plant tissues were not large enough to confuse degraded conifer tissues with other cutin sources. Based on these trends, the finely disseminated cutin-bearing tissues in Dabob Bay sediments appear to be comprised approx. of equal amounts of highly degraded fir/hemlock and cedar needle fragments. According to this estimate, nonwoody vascular plant debris accounted for ∼15% of the total organic matter present in these sediments.

Geochimica et Cosmochimica Acta published new progress about Bay sediments. 13099-34-8 belongs to class alcohols-buliding-blocks, name is 17-Hydroxyheptadecanoic acid, and the molecular formula is C17H34O3, Name: 17-Hydroxyheptadecanoic acid.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts