There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Hydrogels for tissue engineering.

https://yunus.hacettepe.edu.tr/~damlacetin/kmu407/index_dosyalar/4.%20makale.pdf

Biodegradable polymers as biomaterials

Hydrogels in pharmaceutical formulations.

Lithium (Li) metal is an ideal anode material for rechargeable batteries due to its extremely high theoretical specific capacity (3860 mA h g−1), low density (0.59 g cm−3) and the lowest negative electrochemical potential (−3.040 V vs. the standard hydrogen electrode). Unfortunately, uncontrollable dendritic Li growth and limited Coulombic efficiency during Li deposition/stripping inherent in these batteries have prevented their practical applications over the past 40 years. With the emergence of post-Li-ion batteries, safe and efficient operation of Li metal anodes has become an enabling technology which may determine the fate of several promising candidates for the next generation energy storage systems, including rechargeable Li–air batteries, Li–S batteries, and Li metal batteries which utilize intercalation compounds as cathodes. In this paper, various factors that affect the morphology and Coulombic efficiency of Li metal anodes have been analyzed. Technologies utilized to characterize the morphology of Li deposition and the results obtained by modelling of Li dendrite growth have also been reviewed. Finally, recent development and urgent need in this field are discussed.

Lithium metal anodes for rechargeable batteries

The following ionically conductive polyphosphazenes have been synthesized: A) [NP(OCH2CH(CH2O(CH2CH2O)mR)(OCH2CH2)mR)2]n where m = 0 - 3, n ∩ 15,000, R = CH3, and where m = 1, n ∩ 15,000 R = (CH2)3CH3; B) [NP(O(CH2CH2O)mCH3)2]n; C) [NP(OR)x(OCH2CH2OCH2CH2OCH3)y]n, where n = 15,000, x and y are approximately 1 and R is equivalent to O-(CH2)m-CH3 where m ranges from 2 to 9; D) polyphosphazenes bearing crown ether sidegroups.

Ionically conductive polyphosphazenes with ether sidegroups

The synthesis of the first examples of a new class of inorganic macromolecules, the polythiophosphazenes, is reported. When heated at 90° C., the cyclothiophosphazene N 3 P 2 SCl 5 undergoes ring-opening polymerization to yield the high polymeric polythiophosphazene [N 3 P 2 SCl 5 ] n . The latter functions as a reactive macromolecular intermediate and undergoes halogen replacement with sodium phenoxide and sodium o-phenylphenoxide to afford the polymers [N 3 P 2 S(OPh) 5 ] n and [N 3 P 2 S(OC 6 H 4 Ph--o) 3 .25 Cl 1 .75 ] n , respectively.

Method for forming polythiophosphazene macromolecules

Complex formation, conductivity and lithium ion transport in polyphosphazene-based solid electrolytes.

Electrostatic spinning is a well-developed technique for the fabrication of fibers in the nanoscale domain. Novel boron carbide nanofibers were generated by the electrostatic spinning and ceramic conversion of poly(norbornenyldecaborane) (PND) - a polymeric ceramic precursor. The prepyrolyzed fibers were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. The ceramic fibers were characterized by SEM, X-ray diffraction (XRD), 11 B magic-angle spinning nuclear magnetic resonance (MAS NMR) and DRIFT spectroscopy. SEM analysis showed retention of the nanostructure in the pre- and postpyrolyzed fibers.

Electrostatic Spinning, Pyrolysis, and Characterization of Boron Carbide Nanofibers Prepared from Poly(norbornenyldecaborane) - a Polymeric Ceramic Precursor

Nanoclusters comprising inorganic nanocrystals and a biodegradable polymer are disclosed. The inorganic nanocrystals have a mean particle size of 1 to 500 nm. The inorganic nanocrystals are contained within a core of the nanoclusters, on the surface of the nanoclusters, contained within a core of the nanoclusters, dispersed throughout the nanoclusters, or a combination thereof. The biodegradable polymer allows the inorganic nanocrystals to be excreted renally over a period of time. The nanoclusters can be used for medical imaging or other biomedical applications.

Harry R. Allcock

Papers

Ionically conductive polyphosphazenes with ether sidegroups

Method for forming polythiophosphazene macromolecules

Complex formation, conductivity and lithium ion transport in polyphosphazene-based solid electrolytes.

Electrostatic Spinning, Pyrolysis, and Characterization of Boron Carbide Nanofibers Prepared from Poly(norbornenyldecaborane) - a Polymeric Ceramic Precursor

Polyphosphazene delivery system for inorganic nanocrystals