scholarly journals Polymer Optical Waveguide Sensor Based on Fe-Amino-Triazole Complex Molecular Switches

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 195
Author(s):  
Muhammad Shaukat Khan ◽  
Hunain Farooq ◽  
Christopher Wittmund ◽  
Stephen Klimke ◽  
Roland Lachmayer ◽  
...  
Keyword(s):  
Molecular Complex ◽  
Electromagnetic Interference ◽  
Optical Power ◽  
Uv Curing ◽  
Molecular Complexes ◽  
Core Material ◽  
Absorption Bands ◽  
Electronic Temperature ◽  
Polymer Waveguide ◽  
Temperature Detection

We report on a polymer-waveguide-based temperature sensing system relying on switchable molecular complexes. The polymer waveguide cladding is fabricated using a maskless lithographic optical system and replicated onto polymer material (i.e., PMMA) using a hot embossing device. An iron-amino-triazole molecular complex material (i.e., [Fe(Htrz)2.85(NH2-trz)0.15](ClO4)2) is used to sense changes in ambient temperature. For this purpose, the core of the waveguide is filled with a mixture of core material (NOA68), and the molecular complex using doctor blading and UV curing is applied for solidification. The absorption spectrum of the molecular complex in the UV/VIS light range features two prominent absorption bands in the low-spin state. As temperature approaches room temperature, a spin-crossover transition occurs, and the molecular complex changes its color (i.e. spectral properties) from violet-pink to white. The measurement of the optical power transmitted through the waveguide as a function of temperature exhibits a memory effect with a hysteresis width of approx. 12 °C and sensitivity of 0.08 mW/°C. This enables optical rather than electronic temperature detection in environments where electromagnetic interference might influence the measurements.

scholarly journals Superhydrophobic/Flame Retardant/EMI Shielding Fabrics: Manufacturing Techniques and Property Evaluations

2019 ◽  
Vol 9 (9) ◽  
pp. 1914 ◽  
Author(s):  
Hao-Kai Peng ◽  
Yanting Wang ◽  
Ting-Ting Li ◽  
Ching-Wen Lou ◽  
Qi He ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Electromagnetic Interference ◽  
Core Material ◽  
Shielding Effect ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Spun Yarn ◽  
Hydrophobic Treatment ◽  
Fabric Surface ◽  
Emi Se

Electromagnetic pollution interferes with electronic equipment in proximity and jeopardizes human health, which urges the development of electromagnetic interference (EMI) shielding materials. It is urgent to develop electromagnetic interference (EMI) shielding materials. However, the preparation of materials with superhydrophobicity, flame retardancy and EMI shielding properties is still challenging. In this study, we invented a core-spun yarn feeding device, which uses polysulfonamide (PSA) roving as a coating material and stainless steel wire as the core material to prepare a conductive core-spun yarn, which solves the problem of the wire having an easily exposed fabric surface. The finally prepared conductive fabric was subjected to Waterproof 2P hydrophobic treatment to form a superhydrophobic flame-retardant EMI shielding fabric. The results show that the hydrophobic treatment creates a thin film over the woven fabrics, and the contact angle of the fabric surface can reach 155°. The hydrophobic treatment will not damage the shielding effect and slightly increase the dB value. The average dB value of PSA-SS-1’ and PSA-SS-2’ are increased by 0.82 dB and 1.92 dB, respectively. When composed of conductive wrapped yarns for both the warp and weft yarns, the electromagnetic interference shielding effectiveness (EMI SE) of conductive fabrics is beyond 30 dB at 0–3000 MHz and the burnt depth is shorter than 40 mm. As for real applications, superhydrophobic/flame retardant/EMI SE fabrics can be used in a moist and complex environment with retaining conductivity and shielding effectiveness.

4 × 4 Plastic Optical Fiber Star Coupler Incorporated with a Common Polymer Waveguide Optical Power Distribution Region

2011 ◽  
Vol 30 (4) ◽  
pp. 265-277 ◽  
Author(s):  
Kwang Taek Kim ◽  
Boo Jeon Han ◽  
Min Kuk Kim ◽  
Young Ho Kim ◽  
Byeong Ha Lee ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Power Distribution ◽  
Optical Power ◽  
Plastic Optical Fiber ◽  
Polymer Waveguide

Unusual molecular complexes of antimony fluoride dimers with Acetonitrile and Pyridine: structures and bonding

2021 ◽  
Author(s):  
Elena I. Davydova ◽  
Alexander Viktorovich Virovets ◽  
Eugenia V. Presypkina ◽  
Anna Vladimirovna Pomogaeva ◽  
Anna S Lisovenko ◽  
...  
Keyword(s):  
Molecular Complex ◽  
Molecular Complexes ◽  
Antimony Pentafluoride ◽  
Antimony Trifluoride

Structures of two new molecular complexes of antimony pentafluoride with pyridine (Py) and acetonitrile (AN), SbF5•Py and Sb2F10•AN, as well as a molecular complex of antimony trifluoride Sb2F6•Py and its...

Article

1999 ◽  
Vol 77 (1) ◽  
pp. 122-129
Author(s):  
Alpha O Diallo ◽  
Claude Meyer ◽  
Nguyen Van-Thanh
Keyword(s):  
Room Temperature ◽  
Deoxycholic Acid ◽  
Molecular Complexes ◽  
Vapour Phase ◽  
Absorption Bands ◽  
Frequency Shifts ◽  
Local Environments ◽  
Vibrational Energies ◽  
Stretching Vibrations ◽  
Self Association

The frequencies of the O-D stretching vibrations of CH3COOD have been measured in the liquid and vapour phases and in the form of molecular associations with deoxycholic acid and cholesterol. The spectra confirm that the vapour phase is a mixture of monomeric and dimeric forms at room temperature. The vibrational assignment made for the gaseous phase is used in conjunction with prior data available on the monomeric O-D stretching frequencies in solutions to explain the spectroscopic behaviour of the molecular complexes. The pattern of frequency shifts suggests that deuterium bonding links the cholesterol and CH3COOD in the hydrophilic regions and that the self association of the heavy acid is limited to the dimeric species in the complex with deoxycholic acid. Extra absorption bands observed in the spectral region characteristic of the deuterium bond vibrations are tentatively considered to arise from O-D groups in different local environments with different vibrational energies compared with the D-bonded species. Further evidence for steroid-CH3COOD interactions is obtained from a study of the O-H and CbetaO stretching vibrations of the compounds.Key words: acetic acid-d, complexation with deoxycholic acid and cholesterol, infrared spectroscopy.

Estimation of the fraction of dative structure in molecular complexes using Hammett ρ values

1979 ◽  
Vol 57 (12) ◽  
pp. 1418-1420
Author(s):  
Bo-Long Poh
Keyword(s):  
Charge Transfer ◽  
Ionization Potential ◽  
Molecular Complex ◽  
Physical Interpretation ◽  
Molecular Complexes ◽  
Transfer Energy ◽  
Simple Method ◽  
Charge Transfer Energy

A simple method of estimating the fraction of dative structure in molecular complexes using Hammett ρ values is given. A physical interpretation of the parameter m in the equation, hν = mID + n, relating the charge-transfer energy, hν, of a molecular complex and the ionization potential, ID, of the donor is given.

scholarly journals The versatile molecular complex component LC8 promotes several distinct steps of flagellar assembly

2012 ◽  
Vol 198 (1) ◽  
pp. 115-126 ◽  
Author(s):  
Anjali Gupta ◽  
Dennis R. Diener ◽  
Priyanka Sivadas ◽  
Joel L. Rosenbaum ◽  
Pinfen Yang
Keyword(s):  
Molecular Complex ◽  
Binding Sites ◽  
Molecular Complexes ◽  
Terminal Region ◽  
Radial Spoke ◽  
Complex Component ◽  
Flagellar Assembly ◽  
A Subunit ◽  
Docking Proteins ◽  
Base Formation

LC8 is present in various molecular complexes. However, its role in these complexes remains unclear. We discovered that although LC8 is a subunit of the radial spoke (RS) complex in Chlamydomonas flagella, it was undetectable in the RS precursor that is converted into the mature RS at the tip of elongating axonemes. Interestingly, LC8 dimers bound in tandem to the N-terminal region of a spoke phosphoprotein, RS protein 3 (RSP3), that docks RSs to axonemes. LC8 enhanced the binding of RSP3 N-terminal fragments to purified axonemes. Likewise, the N-terminal fragments extracted from axonemes contained LC8 and putative spoke-docking proteins. Lastly, perturbations of RSP3’s LC8-binding sites resulted in asynchronous flagella with hypophosphorylated RSP3 and defective associations between LC8, RSs, and axonemes. We propose that at the tip of flagella, an array of LC8 dimers binds to RSP3 in RS precursors, triggering phosphorylation, stalk base formation, and axoneme targeting. These multiple effects shed new light on fundamental questions about LC8-containing complexes and axoneme assembly.

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