Self-Assembly of Long-Chain Betaine Surfactants: Effect of Tailgroup Structure on Wormlike Micelle Formation

Langmuir ◽  
2017 ◽  
Vol 34 (3) ◽  
pp. 970-977 ◽  
Author(s):  
Veena T. Kelleppan ◽  
Jackson E. Moore ◽  
Thomas M. McCoy ◽  
Anna V. Sokolova ◽  
Liliana de Campo ◽  
...  
Keyword(s):  
Self Assembly ◽  
Micelle Formation ◽  
Wormlike Micelle ◽  
Long Chain

scholarly journals Stereocomplex Polylactide for Drug Delivery and Biomedical Applications: A Review

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2846
Author(s):  
Seung Hyuk Im ◽  
Dam Hyeok Im ◽  
Su Jeong Park ◽  
Justin Jihong Chung ◽  
Youngmee Jung ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Lactic Acid ◽  
Self Assembly ◽  
Biomedical Applications ◽  
Drug Carrier ◽  
Micelle Formation ◽  
Weak Stability ◽  
Critical Fields ◽  
Physical Strength ◽  
Anti Cancer

Polylactide (PLA) is among the most common biodegradable polymers, with applications in various fields, such as renewable and biomedical industries. PLA features poly(D-lactic acid) (PDLA) and poly(L-lactic acid) (PLLA) enantiomers, which form stereocomplex crystals through racemic blending. PLA emerged as a promising material owing to its sustainable, eco-friendly, and fully biodegradable properties. Nevertheless, PLA still has a low applicability for drug delivery as a carrier and scaffold. Stereocomplex PLA (sc-PLA) exhibits substantially improved mechanical and physical strength compared to the homopolymer, overcoming these limitations. Recently, numerous studies have reported the use of sc-PLA as a drug carrier through encapsulation of various drugs, proteins, and secondary molecules by various processes including micelle formation, self-assembly, emulsion, and inkjet printing. However, concerns such as low loading capacity, weak stability of hydrophilic contents, and non-sustainable release behavior remain. This review focuses on various strategies to overcome the current challenges of sc-PLA in drug delivery systems and biomedical applications in three critical fields, namely anti-cancer therapy, tissue engineering, and anti-microbial activity. Furthermore, the excellent potential of sc-PLA as a next-generation polymeric material is discussed.

scholarly journals Phthalocyanine formation using metals in primary alcohols at room temperature

2000 ◽  
Vol 04 (01) ◽  
pp. 103-111 ◽  
Author(s):  
CLIFFORD C. LEZNOFF ◽  
ANNA M. D'ASCANIO ◽  
S. ZEKI YILDIZ
Keyword(s):  
Molecular Weight ◽  
Copper Powder ◽  
Reverse Micelle ◽  
Room Temperature ◽  
Micelle Formation ◽  
Lithium Metal ◽  
Electronic Effects ◽  
Primary Alcohols ◽  
Lower Yield ◽  
Long Chain

Lithium metal added to a solution of 4-neopentoxyphthalonitrile in 1-octanol or other long-chain primary alcohols at room temperature resulted in phthalocyanine formation at a reasonable rate in good yield, while preformed lithium 1-octanolate under the same conditions gave 2,9,16,23-tetraneopentoxyphthalocyanine, but in lower yield at a slower rate. The use of lower-molecular-weight alcohols slowly gave a phthalocyanine in lower yields. Reverse micelle formation when using long-chain alcohols is proposed as a possibility for enhanced phthalocyanine formation at room temperature. 2,9,16,23-Tetrasubstituted phthalocyanines and metallated phthalocyanines were prepared at room temperature from 4-neopentoxyphthalonitrile, 4-bis(4-methoxyphenyl)methoxyphthalonitrile, 4-[1-(4-ethoxy-3-methoxyphenyl)-1-phenyl]methoxyphthalonitrile and phthalonitrile using lithium 1-octanolate in 1-octanol or by the addition, to a solution of the phthalonitrile in ethanol, of calcium turnings or, to a solution of the phthalonitrile in methanol, of magnesium, zinc, iron or copper powder. The tetrasubstituted phthalocyanines produced exhibited a non-statistical distribution of regioisomers, indicating that electronic effects become important in room-temperature cyclotetramerization of phthalonitriles to phthalocyanines.

scholarly journals Self-assembly of alkyl chains of fatty acids in papermaking systems: A review of related pitch issues, hydrophobic sizing, and pH effects

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 4591-4635
Author(s):  
Martin A. Hubbe ◽  
Douglas S. McLean ◽  
Karen R. Stack ◽  
Xiaomin Lu ◽  
Anders Strand ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Self Assembly ◽  
Review Article ◽  
Ph Effects ◽  
Monolayer Films ◽  
Alkyl Chains ◽  
Ph Values ◽  
Self Association ◽  
Long Chain

This review article considers the role of fatty acids and the mutual association of their long-chain (e.g. C18) alkyl and alkenyl groups in some important aspects of papermaking. In particular, published findings suggest that interactions involving fatty acids present as condensed monolayer films can play a controlling role in pitch deposition problems. Self-association among the tails of fatty acids and their soaps also helps to explain some puzzling aspects of hydrophobic sizing of paper. When fatty acids and their soaps are present as monolayers in papermaking systems, the pH values associated with their dissociation, i.e. their pKa values, tend to be strongly shifted. Mutual association also appears to favor non-equilibrium multilayer structures that are tacky and insoluble, possibly serving as a nucleus for deposition of wood extractives, such, as resins and triglyceride fats, in pulp and paper systems.

scholarly journals Synthesis and Advanced Characterisation of Layered Platelets by Self-assembly of Long-chain Amines

2018 ◽  
Vol 24 (S1) ◽  
pp. 1566-1567
Author(s):  
Andres Seral-Ascaso ◽  
Clive Downing ◽  
Hannah C. Nerl ◽  
Anuj Pokle ◽  
Sonia Metel ◽  
...  
Keyword(s):  
Self Assembly ◽  
Long Chain

Self-assembly of NIR luminescent 30-metal drum-like and 12-metal rectangular d–f nanoclusters with long-chain Schiff base ligands

2014 ◽  
Vol 50 (98) ◽  
pp. 15569-15572 ◽  
Author(s):  
Xiaoping Yang ◽  
Zongping Li ◽  
Shiqing Wang ◽  
Shaoming Huang ◽  
Desmond Schipper ◽  
...  
Keyword(s):  
Schiff Base ◽  
Self Assembly ◽  
Schiff Base Ligands ◽  
Long Chain

Two classes of NIR luminescent heterobimetallic d–f nanoclusters [Ln6Cd24(L1)11(OAc)43(OH)] and [Ln4Zn8(L2)2(OAc)20(OH)4] (Ln = Nd and Yb) were prepared using flexible long-chain Schiff base ligands which have (CH2)6 backbones.

Chiral inversion and enhanced cooperative self-assembly of biosurfactant-functionalized porphyrin chromophores

2020 ◽  
Vol 8 (14) ◽  
pp. 4675-4679 ◽  
Author(s):  
Kyle C. Peters ◽  
Shekar Mekala ◽  
Richard A. Gross ◽  
Kenneth D. Singer
Keyword(s):  
Self Assembly ◽  
Chiral Inversion ◽  
Lipid Chain ◽  
Long Chain ◽  
Chain Compound

A newly synthesized sophorolipid–(Zn)porphyrin (short lipid chain) exhibits chiral inversion and enhanced cooperative self-assembly compared to its analogue long-chain compound.

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