X-ray study of Poly(vinyl Alcohol)-Iodine complex prepared from the dilute iodine solution as a hint to know the inner structure of polarizer

Tashiro, Kohji; Takahama, T.; Wang, Meng Fan

doi:10.1016/j.polymer.2021.124180

Cited by 15 publications

(29 citation statements)

References 55 publications

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“…The strongest peaks, 2θ = 15.3° (111) and 25.3° (220), in the XRD analysis belong to iodine and pentaiodide species, respectively ( Figure 3 ) [ 25 , 29 , 30 , 33 ]. Further peaks at 17.1 (301), 47.4, 39.1, 31 (222), and 23.1° are assigned to iodine molecules according to previous investigations ( Table 5 ) [ 24 , 25 , 29 , 30 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

“…As an alternative, iodine has been a known microbicide throughout the history of mankind, with various applications due to its vast availability, ease of operation, and interesting properties [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Iodine is used as a biocide, as iodophor, in different complex forms due to its excellent antimicrobial activities [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Iodine itself, and in the form of povidone iodine, has several drawbacks, such as staining, skin irritation, instability, uncontrolled iodine release, and, therefore, short-term durability in infection control [ 17 , 26 , 27 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

“…The attachment of iodine (I 2 ) molecules to the stable triiodide I 3 − ions (I 3 − ) by halogen and hydrogen bonding leads to a variety of polyiodide structures [ 38 , 39 , 40 ]. Triiodides are the basic topology and are utilized in many applications in different fields [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. Higher polyiodides can be synthesized depending on complexing/stabilizing agents, solvents, and available counterions [ 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

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Antimicrobial V-Shaped Copper(II) Pentaiodide: Insights to Bonding Pattern and Susceptibility

Edis

Bloukh²

2022

Molecules

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Antimicrobial resistance (AMR) is a major concern for the survival of mankind. COVID-19 accelerated another silent pandemic of AMR through the uncontrolled use of antibiotics and biocides. New generations of antimicrobial agents are needed to combat resistant pathogens. Crown ethers can be used as models for drug action because they are similar to antibiotics. Iodine is a well-known microbicide but is characterized by instability and short-term effectivity. Iodine can be stabilized in the form of polyiodides that have a rich topology but are dependent on their immediate surroundings. In addition, copper has been successfully used since the beginning of history as a biocidal agent. We, therefore, combined iodine and copper with the highly selective crown ether 1,4,7,10-tetraoxacyclododecane (12-crown-4). The morphology and composition of the new pentaiodide [Cu(12-crown-4)2]I5 was investigated. Its antimicrobial activities against a selection of 10 pathogens were studied. It was found that C. albicans WDCM 00054 is highly susceptible to [Cu(12-crown-4)2]I5. Additionally, the compound has good to intermediate antimicrobial activity against Gram-positive and Gram-negative bacilli. The chain-like pentaiodide structure is V-shaped and consists of iodine molecules with very short covalent bonds connected to triiodides by halogen bonding. The single crystal structure is arranged across the lattice fringes in the form of ribbons or honeycombs. The susceptibility of microorganisms towards polyiodides depends on polyiodide bonding patterns with halogen-, covalent-, and non-covalent bonding.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Antimicrobial V-Shaped Copper(II) Pentaiodide: Insights to Bonding Pattern and Susceptibility

Edis

Bloukh²

2022

Molecules

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“…Iodine, a well-known microbicide, is marketed in the form of different iodophors and polymeric complexes [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Antiseptic iodophors are unaffected by microbial resistance mechanisms and can be utilized to overcome AMR [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial Biomaterial on Sutures, Bandages and Face Masks with Potential for Infection Control

et al. 2022

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Antimicrobial resistance (AMR) is a challenge for the survival of the human race. The steady rise of resistant microorganisms against the common antimicrobials results in increased morbidity and mortality rates. Iodine and a plethora of plant secondary metabolites inhibit microbial proliferation. Antiseptic iodophors and many phytochemicals are unaffected by AMR. Surgical site and wound infections can be prevented or treated by utilizing such compounds on sutures and bandages. Coating surgical face masks with these antimicrobials can reduce microbial infections and attenuate their burden on the environment by re-use. The facile combination of Aloe Vera Barbadensis Miller (AV), Trans-cinnamic acid (TCA) and Iodine (I2) encapsulated in a polyvinylpyrrolidone (PVP) matrix seems a promising alternative to common antimicrobials. The AV-PVP-TCA-I2 formulation was impregnated into sterile discs, medical gauze bandages, surgical sutures and face masks. Morphology, purity and composition were confirmed by several analytical methods. Antimicrobial activity of AV-PVP-TCA-I2 was investigated by disc diffusion methods against ten microbial strains in comparison to gentamycin and nystatin. AV-PVP-TCA-I2 showed excellent antifungal and strong to intermediate antibacterial activities against most of the selected pathogens, especially in bandages and face masks. The title compound has potential use for prevention or treatment of surgical site and wound infections. Coating disposable face masks with AV-PVP-TCA-I2 may be a sustainable solution for their re-use and waste management.

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“…Miyasaka [ 10 ] proposed a model of the

complex formed in the PVA amorphous phase, in which the structure had four syndiotactic PVA segments with the extended conformation surrounding a polyiodine. Recently, Tashiro et al [ 19 ] proved that the vertically arrayed linear

ions were surrounded by six PVA chains of planar-zigzag conformation to form the cylindrical structure when the PVA sample was immersed in an iodine solution with an extremely low concentration of 0.001~0.05 M.…”

Section: Introductionmentioning

confidence: 99%

Effect of KI Concentration in Correcting Tank on Optical Properties of PVA Polarizing Film

Yang

Zheng

et al. 2022

Polymers

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Polarizer is a key component of the liquid crystal display panel, and the optical properties mainly include transmittance, degree of polarization and chromaticity. Polarizer is made of a multilayer optical film, in which the PVA polarizing film is the core structure for realizing the polarization of the whole polarizer. PVA polarizing film is commonly manufactured through a multi-step craft, including rinsing, dyeing, stretching and correcting. The correction process has a significant impact on the final apparent color and optical properties of the polarizer. In this study, the KI concentration in the correcting tank, ranging from 1% to 3%, was systematically investigated. With the increase in KI concentration, the Raman vibration peak at 160 cm−1 representing I5− ions gradually weakened, while the Raman vibration peak at 110 cm−1 representing I3− ions gradually increased, indicating that the KI in the correcting tank changed the chemical equilibrium of polyiodide ions in PVA. Then abundant chromophore I5− ions were consumed and I3− ions generated, so that the apparent color of PVA polarizing film gradually changed from dark blue to dark gray, and the chromaticity a-value and b-value gradually increased. The change in the concentration of dichroic species (I5− and I3−) in PVA polarizing film had directly affected its transmittance in the visible range. From the UV-Vis transmittance spectrum of PVA polarizing film, when the I5− ions were consumed and I3− ions generated, the transmittance of PVA polarizing film in the region of 675–525 nm wavelength increased gradually while the polarization degree also increased.

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X-ray study of Poly(vinyl Alcohol)-Iodine complex prepared from the dilute iodine solution as a hint to know the inner structure of polarizer

Cited by 15 publications

References 55 publications

Antimicrobial V-Shaped Copper(II) Pentaiodide: Insights to Bonding Pattern and Susceptibility

Antimicrobial V-Shaped Copper(II) Pentaiodide: Insights to Bonding Pattern and Susceptibility

Antimicrobial Biomaterial on Sutures, Bandages and Face Masks with Potential for Infection Control

Effect of KI Concentration in Correcting Tank on Optical Properties of PVA Polarizing Film

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