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

Polymeres avec des liaisons covalentes phosphore-metal de transition, prepares par: 1) reaction d'un anion organometallique [FeCp(CO) 2 ] − avec un polyphosphazene ayant des groupes lateraux chloro- et trifluoro- hoxy et 2) reaction d'un halogenure organometallique FeCp(CO) 2 I avec un polyphosphazeux ayant des sites anioniques sur le squelette phosphore

Transition-metal derivatives of polyphosphazenes: syntheses of polyphosphazenes and cyclic model compounds with iron cyclopentadienyl carbonyl side groups

REACTION OF MONO‐ AND DILITHIOFERROCENE WITH OCTACHLOROCYCLOTETRAPHOSPHAZENE. THE CRYSTAL AND MOLECULAR STRUCTURES OF N4P4CL6((N‐C5H4)FE(η‐C5H5))2 AND N3P3CL4((N‐C5H4)FE(η‐C5H5))N4P4CL7

p-Xylene clathrate of tris(1,8-naphthalenedioxy)cyclotriphosphazene. X-ray crystal and molecular structure

The crystal structures of OP(OR) 2 NP(OR) 3 , where OR=O-C 6 H 4 F-p, O-C 6 H 4 Cl-p, and O-C 6 H 4 Br-p, and [NP(OR) 2 ] 3 , where OR=O-C 6 H 4 F-p, O-C 6 H 4 Cl-p, O-C 6 H 4 Br-p and O-C 6 H 4 I-p, were determined by X-ray crystallography. These small molecule phosphazenes are structural models for the corresponding high polymers, and their structures provide insight into the conformation and nature of bonding in the polymeric species

Synthesis and Structures of (p-Halogenophenoxy)phosphazenes: Comparison of the Structures of Cyclic and Linear Short-Chain Species

A series of cyclic tri- and tetra-metric phosphazenes [NP(OR)2]n(n= 3 or 4), N3P3(OR)Cl5 and N3P3(OR)4Cl2 has been prepared with 1- or 2-naphthyloxy, 1-naphthylmethyloxy, 1-naphthylethyloxy, 9-anthryloxy and 9-phenanthryloxy side groups OR. These syntheses are model processes for the preparation of the corresponding phosphazene high polymers. The small-molecule compounds were characterized by a combination of 31P NMR and mass spectroscopy, elemental analysis and crystal structures of six compounds. Attempts to synthesize the corresponding phosphazene high polymers by similar substitution techniques were, in general, successful, with high-temperature reaction conditions needed to overcome steric hindrance effects.

Harry R. Allcock

Papers

Transition-metal derivatives of polyphosphazenes: syntheses of polyphosphazenes and cyclic model compounds with iron cyclopentadienyl carbonyl side groups

REACTION OF MONO‐ AND DILITHIOFERROCENE WITH OCTACHLOROCYCLOTETRAPHOSPHAZENE. THE CRYSTAL AND MOLECULAR STRUCTURES OF N4P4CL6((N‐C5H4)FE(η‐C5H5))2 AND N3P3CL4((N‐C5H4)FE(η‐C5H5))N4P4CL7

p-Xylene clathrate of tris(1,8-naphthalenedioxy)cyclotriphosphazene. X-ray crystal and molecular structure

Synthesis and Structures of (p-Halogenophenoxy)phosphazenes: Comparison of the Structures of Cyclic and Linear Short-Chain Species

Synthesis and structure of small-molecule phosphazene rings bearing fused-ring aryloxy side groups: models for optically useful high polymers