Preparation and Application of High-Efficiency, Antibacterial, and Antiviral PET–PTHP Fibers

Transmission through the respiratory tract is one of the most important ways for bacteria and viruses to infect the human body; the use of high-performance antibacterial and antiviral protective equipment is the most effective way to prevent the spread of respiratory diseases. However, at present, most personal protective equipment lacks the ability to kill pathogens. In this paper, a kind of polytetrahydropyrimidine–polyethylene terephthalate functional fiber (PET–PTHP fibers) with highly sustained antibacterial and antiviral properties was prepared. The inactivation rate of the fibers against Staphylococcus aureus and Escherichia coli was as high as 99.99%, and the antibacterial time was more than 72 h. The fibers have an obvious destructive effect on lentiviruses and can reduce the infection rate of lentiviruses in BxPC-3 cells from 25.4 to 9.7%. The cytotoxicity test, cell live/dead staining test, and cell proliferation test all confirmed that PET–PTHP fibers have no obvious cytotoxicity and good cytocompatibility. By applying the functional fibers to the inner layer of the masks, a new type of mask with adsorption, filtration, and killing properties against pathogens was prepared. The filtration efficiency of the new masks was 99.3%, and the pressure drop was 104 Pa. The new masks have excellent air permeability and filtration effect, meet the practical application conditions, and are of grade A; therefore, these masks provide medical protection as well as kill pathogens at the same time, further reducing the risk of human infection

Hybrid Top-Down/Bottom-Up Strategy Using Superwettability for the Fabrication of Patterned Colloidal Assembly

Superwettability of substrates has had a profound influence on the production of novel and advanced colloidal assemblies in recent decades owing to its effect on the spreading area, evaporation rate, and the resultant assembly structure. In this paper, we investigated in detail the influence of the superwettability of a transfer/template substrate on the colloidal assembly from a hybrid top-down/bottom-up strategy. By taking advantage of a superhydrophilic flat transfer substrate and a superhydrophobic groove-structured silicon template, the patterned colloidal microsphere assembly was formed including linear and mesh-, cyclic-, and multistopband assembly arrays of microspheres, and the optic-waveguide of a circular colloidal structure was demonstrated. We believed this liquid top-down/bottom-up strategy would open an efficient avenue for assembling/integrating microspheres building blocks into device applications in a low-cost manner

Facile Synthesis of an Extensive Family of Sc₂O@C_2<i>n</i> (<i>n</i> = 35–47) and Chemical Insight into the Smallest Member of Sc₂O@<i>C</i>₂(7892)–C₇₀

An extensive family of oxide cluster fullerenes (OCFs) Sc₂O@C_2<i>n</i> (<i>n</i> = 35–47) has been facilely produced for the first time by introducing CO₂ as the oxygen source. Among this family, Sc₂O@C₇₀ was identified as the smallest OCF and therefore isolated and characterized by mass spectrometry, ⁴⁵Sc nuclear magnetic resonance, UV–vis–near-infrared absorption spectroscopy, cyclic voltammetry, and density functional theory calculations. The combined experimental and computational studies reveal a non-isolated pentagon rule isomer Sc₂O@C₂(7892)–C₇₀ with reversible oxidative behavior and lower bandgap relative to that of Sc₂S@<i>C</i>₂(7892)–C₇₀, demonstrating a typical example of unexplored OCF and underlining its cluster-dependent electronic properties

Regioselective Benzyl Radical Addition to an Open-Shell Cluster Metallofullerene. Crystallographic Studies of Cocrystallized Sc₃C₂@<i>I</i>_<i>h</i><i>‑</i>C₈₀ and Its Singly Bonded Derivative

The endohedral fullerene once erroneously identified as Sc₃@C₈₂ was recently shown to be Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀, the first example of an open-shell cluster metallofullerene. We herein report that benzyl bromide (<b>1</b>) reacts with Sc₃C₂@ <i>I</i>_<i>h</i>-C₈₀ via a regioselective radical addition that affords only one isomer of the adduct Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀(CH₂C₆H₅) (<b>2</b>) in high yield. An X-ray crystallographic study of <b>2</b> demonstrated that the benzyl moiety is singly bonded to the fullerene cage, which eliminates the paramagnetism of the endohedral in agreement with the ESR results. Interestingly, X-ray results further reveal that the 3-fold disordered Sc₃C₂ cluster adopts two different configurations inside the cage. These configurations represent the so-called “planar” form and the computationally predicted, but not crystallographically characterized, “trifoliate” form. It is noteworthy that this is the first crystallographic observation of the “trifoliate” form for the Sc₃C₂ cluster. In contrast, crystallographic investigation of a Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀/Ni­(OEP) cocrystal, in which the endohedral persists in an open-shell structure with paramagnetism, indicates that only the former form occurs in pristine Sc₃C₂@ <i>I</i>_<i>h</i>-C₈₀. These results demonstrate that the cluster configuration in EMFs is highly sensitive to the electronic structure, which is tunable by exohedral modification. In addition, the electrochemical behavior of Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀ has been markedly changed by the radical addition, but the absorption spectra of the pristine and the derivative are both featureless. These results suggest that the unpaired electron of Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀ is buried in the Sc₃C₂ cluster and does not affect the electronic configuration of the cage

Regioselective Benzyl Radical Addition to an Open-Shell Cluster Metallofullerene. Crystallographic Studies of Cocrystallized Sc₃C₂@<i>I</i>_<i>h</i><i>‑</i>C₈₀ and Its Singly Bonded Derivative

The endohedral fullerene once erroneously identified as Sc₃@C₈₂ was recently shown to be Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀, the first example of an open-shell cluster metallofullerene. We herein report that benzyl bromide (<b>1</b>) reacts with Sc₃C₂@ <i>I</i>_<i>h</i>-C₈₀ via a regioselective radical addition that affords only one isomer of the adduct Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀(CH₂C₆H₅) (<b>2</b>) in high yield. An X-ray crystallographic study of <b>2</b> demonstrated that the benzyl moiety is singly bonded to the fullerene cage, which eliminates the paramagnetism of the endohedral in agreement with the ESR results. Interestingly, X-ray results further reveal that the 3-fold disordered Sc₃C₂ cluster adopts two different configurations inside the cage. These configurations represent the so-called “planar” form and the computationally predicted, but not crystallographically characterized, “trifoliate” form. It is noteworthy that this is the first crystallographic observation of the “trifoliate” form for the Sc₃C₂ cluster. In contrast, crystallographic investigation of a Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀/Ni­(OEP) cocrystal, in which the endohedral persists in an open-shell structure with paramagnetism, indicates that only the former form occurs in pristine Sc₃C₂@ <i>I</i>_<i>h</i>-C₈₀. These results demonstrate that the cluster configuration in EMFs is highly sensitive to the electronic structure, which is tunable by exohedral modification. In addition, the electrochemical behavior of Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀ has been markedly changed by the radical addition, but the absorption spectra of the pristine and the derivative are both featureless. These results suggest that the unpaired electron of Sc₃C₂@<i>I</i>_<i>h</i>-C₈₀ is buried in the Sc₃C₂ cluster and does not affect the electronic configuration of the cage