Complex Formation Between Poly(dimethylsilane) and Cyclodextrins

Poly(dimethylsilane)s form inclusion complexes with cyclodextrins in high selectivity to give crystalline compounds. β‐Cyclodextrin forms complexes with poly(dimethylsilane)s of low molecular weight only, γ‐cyclodextrin with poly(dimethylsilane)s of high molecular weight in high yield, and α‐cyclodextrin does not form complexes with poly(dimethylsilane) at all. Complexes were isolated and characterized by spectroscopic methods and X‐ray diffraction.     

One-Pot,Open-Air Synthesis of Flexible and Degradable Multifunctional Polymer Composites with Adhesion,Water Resistance,Self-Healing,Facile Drug Loading,and Sustained Release Properties

Developing proper wound management via wound dressings represents a global challenge. Ideal wound dressings shall encompass multiple integrated functionalities for variable, complex scenarios; however, this is challenging due to the complex molecular design and synthesis process. Herein, polymer composites, cross-linked poly(styrene oxide-co-hexaphenylcyclotrisiloxane)/crosslinked poly(hexaphenylcyclotrisiloxane) (cP(SO-co-HPCTS)/cPHPCTS) with multiple functionalities are prepared by a one-step, open-air method using catalytic ring-opening polymerization. The introduction of a mobile polymer cP(SO-co-HPCTS) endows the composite with good flexibility and self-healing properties at human body temperature. The hydrophobic groups in the main chain provide hydrophobicity and good water resistance, while the hydroxyl groups contained in the end groups enable good adhesion properties. Drugs can be efficiently loaded by blending and then sustainably release from the polymer composite. The material can rapidly degrade in a tetrahydrofuran solution of tetrabutylammonium fluoride due to its Si O Si bonds. The facile, one-step, open-air synthesis procedure and multiple functional properties integrated into the composites provide good prospects for their extensive application and batch production as wound dressing materials.     

Janus Metastructure Based on Magnetized Plasma Material with and Logic Gate and Multiple Physical Quantity Detection

In this paper, a Janus metastructure (JMS) is proposed that can act both as a logic gate and detect multiple physical quantities. By adjusting the incident angle of electromagnetic waves, arranging the dielectrics asymmetrically, and using the anisotropy of the plasma, the Janus function can be obtained, which gives the metastructure a multiscale property. Sharp transmission peak (TP) is generated by located defect mode resonance. The AND logic gate on the positive and negative scales can be realized by judging the TP value. By locking the point frequency of the TP, the refractive index, magnetic field strength, incident angle, and plasma density can be detected simultaneously on the two scales in the GHz range, which is rarely studied. Good sensing performances are also owned, and the corresponding optimal sensitivities are 0.095 (2πc/d)/RIU, 9.42 × 10⁻³ (2πc/d)/T, 1.48 × 10⁻³ (2πc/d)/°, and 0.035 (2πc/d) m³/10¹⁹, respectively. Compared with the traditional sensors, the proposed JMS equipped with two scales not only can realize the logic gate but also measure multiple physical quantities, which has a certain application potential.     

Janus Device Based on Liquid Crystal Regulation with a Large Incidence Angle: Analogous Quantum Optical Effect and Absorption

In this paper, a Janus metastructure device (JMD) is proposed. The JMD design introduces asymmetric structures, which leads to the generation of analogous quantum optical effects when light is incident at large angles. Specifically, forward electromagnetic-induced transparency (EIT) and backward narrowband absorption (NA) are achieved when light is incident along different directions, displaying Janus characteristics in the forward and backward directions. Additionally, the operating frequency of JMD can be controlled through the use of liquid crystal. Such features hold promising potential for various applications in photonic and optoelectronic fields. When the axial direction of the liquid crystal is oriented along the x-direction, the JMD achieves a transparent window over 90% within 0.46–0.51 THz at forward incidence, and an absorption peak of 84.1% appears at 0.331 THz at backward incidence. When the axial direction is oriented along the y-direction, the JMD achieves EIT in the range of 0.51–0.575 THz at forward incidence, and a backward absorption peak of 93.3% occurs at 0.305 THz. In addition, the performance changes at different polarization and incidence angles are presented. The mechanism of absorption generation, the method of suppressing excess absorption, and the parametric inversion of the electromagnetic characteristics of JMD are also discussed.     

Xanthan or esterified xanthan/cobalt ferrite-lignin hybrid materials for methyl blue and basic fuchsine dyes removal: equilibrium,kinetic and thermodynamic studies

In this study, new adsorbents based on xanthan (XG) or esterified xanthan (XGAC) and ferrite-lignin hybrids were obtained and characterized by using the dynamic vapor sorption (DVS) method, infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The porosity, swelling ratio and point of zero charge (PZC) of the adsorbents were also evaluated. Batch adsorption experiments have been performed to determine the adsorption capacity of the adsorbents for Methyl Blue (MB) and Basic Fuchsine (BF). Ferrite-Lignoboost® lignin and ferrite-organosolv lignin hybrid materials (CFLB and CFLO) presented the highest adsorption capacity for MB dye (44.73 and 37.54 mg/g), while the adsorbents based on xanthan and ferrite-lignin hybrids (XG/CFLO and XG/CFLB) retained the highest quantities of BF dye (36.23 and 33.33 mg/g). The chemical nature of the adsorption process was determined, the analyzed data being better fitted to the pseudo second order (PSO) kinetic model. The data analysis showed that the adsorption process followed Langmuir, Dubinin-Radushkevich and Jovanovi? isotherm models. All the studied adsorption processes were endothermic (ΔH^o > 0) and the positive values of the entropy (ΔS^o > 0) indicated disorder at the interface between the adsorbent and the dye solutions.