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Jialin Mao, Wei Zhang, Stephen Zd Cheng, Chrys Wesdemiotis
Monodisperse, sequence-defined polymers can be potentially used for digital data storage. This study reports the sequence analysis and differentiation of monodisperse polyester copolymers carrying side chains functionalized in a specific order by polyhedral oligomeric silsesquioxane (POSS) nanoparticles. Steglich esterification and succinic anhydride ring-opening chemistries were utilized iteratively to synthesize the intended sequences, which were characterized by matrix-assisted laser desorption ionization tandem mass spectrometry (MALDI-MS2 )...
February 2019: European Journal of Mass Spectrometry
Zahra Bahrami, Ali Akbari, Bagher Eftekhari-Sis
In this work, for the first time, we presented a novel design strategy to fabricate a new type of Octa-aminopropyl polyhedral oligomeric silsesquioxane hydrochloride salt (OA-POSS)-based Alg/PAAm DN gels, consisting of PAAm gel as the first chemical network and Alg/OA-POSS gel as the second chemical-physical network. Incorporation of OA-POSS nanoparticles with various feed ratio into the second network not only led to form strong coordination interactions but also in comparison to the other Alg/PAAm gels demonstrated superior mechanical properties...
February 8, 2019: International Journal of Biological Macromolecules
Kun Tian, Tien-Yau Luh, Xuhong Wang, Chaowei Hao, Xiongfa Yang, Ze Li, Guoqiao Lai
The preparation of linear polysilsesquioxanes having Si-OH side groups is not trivial, because direct condensation of multifunctional silanol derivatives would lead to branched or crosslinked polymers. We have successfully prepared an unsymmetrical double-decker silsesquioxane with a silyl hydride function at one end and two silanol groups at the other. Linear POSS polymers having Si-OH side groups are obtained selectively in good yields. The properties and potential applications are briefly presented.
February 6, 2019: Chemical Communications: Chem Comm
Hyo-Geun Jeong, Yoon-Soo Han, Kyung-Hye Jung, Young-Jin Kim
To provide adequate conditions for the regeneration of damaged bone, it is necessary to develop piezoelectric porous membranes with antioxidant and anti-inflammatory activities. In this study, composite nanofibers comprising poly(vinylidene fluoride) (PVDF) and a polyhedral oligomeric silsesquioxane⁻epigallocatechin gallate (POSS⁻EGCG) conjugate were fabricated by electrospinning methods. The resulting composite nanofibers showed three-dimensionally interconnected porous structures. Their average diameters, ranging from 936 ± 223 nm to 1094 ± 394 nm, were hardly affected by the addition of the POSS⁻EGCG conjugate...
February 1, 2019: Nanomaterials
Hajar Maleki, Lawrence Whitmore, Nicola Hüsing
The development of aerogels with improved mechanical properties, to expand their utility in high-performance applications, is still a big challenge. Besides fossil-fuel based polymers that have been extensively utilized as platforms to enhance the mechanical strength of silsesquioxane and silica-based aerogels, using green biopolymers from various sustainable renewable resources are currently drawing significant attention. In this work, we process silk fibroin (SF) proteins, extracted from silkworm cocoons, with organically substituted alkoxysilanes in an entirely aqueous based solution via a successive sol-gel approach, and show for the first time that it is possible to produce homogeneous interpenetrated (IPN) polymethylsilsesquioxane (PMSQ)-SF hybrid aerogel monoliths with significantly improved mechanical properties...
July 14, 2018: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
Samahe Sadjadi, Masoumeh Malmir, Majid M Heravi, Maryam Raja
For the first time a novel magnetic catalyst was prepared through hybridization of functionalized cyclodextrin nanosponges and octakis(3-chloropropyl)octasilsesquioxane followed by incorporation of Pd and magnetic nanoparticles. The resulting composite, was utilized as an efficient heterogeneous catalyst for promoting Sonogashira and Heck reactions in the absence of any ligand and co-catalyst under mild reaction condition. Comparison of the catalytic activities of the control catalysts and the catalyst confirmed that cyclodextrin nanosponges was more efficient support that cyclodextrin...
January 29, 2019: International Journal of Biological Macromolecules
Patrycja Żak, Małgorzata Bołt, Beata Dudziec, Maciej Kubicki
A new platinum complex bearing bulky N-heterocyclic carbene ligand of the general formula [Pt(IPr*Ph)(dvtms)] (where IPr*Ph = 1,3-bis{2,4,6-tris(diphenylmethyl)phenyl}imidazol-2-ylidene, dvtms = divinyltetramethyldisiloxane) exhibits a high catalytic activity towards E-selective dimerization of ethynyl substituted siloxysilsesquioxanes. This process leads to a novel class of functionalized silsesquioxane derivatives, resembling their dumbbell-shaped silsesquioxane analogues.
January 31, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Zhihang An, Si Chen, Xiaoqian Tong, Huiwen He, Jin Han, Meng Ma, Yanqin Shi, Xu Wang
A novel fluorescence chemosensor quickly detecting synthetic drugs for on-site check and pre-screening is firstly reported. An eight tetraphenylethene (TPE) modified polyhedral oligomeric silsesquioxane (POSS) dendrimer is designed and synthesized as an aggregation-induced emission (AIE) chemosensor, which exhibits great enchancement of unique monomer emission in pure tetrahydrofuran (THF) and AIE emission in THF/water thanks to forming different self-assembly morphologies. And POSS-TPE can sensitively detect methamphetamine and ketamine even in artificial saliva by non-covalent interaction forces...
January 23, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
Yiqiong Chen, Dandan Zhu, Xinyue Ding, Guomin Qi, Xucong Lin, Zenghong Xie
A novel polyhedral oligomeric silsesquioxane (POSS)-containing aptamer-modified hybrid affinity monolith with excellent hydrophilicity and unique architecture without Si-OH groups is presented herein, and the nonspecific adsorption caused by the hydrophobic nature of the monolithic column or polar interaction with silanol groups is minimized. Via a simple "one-pot" procedure, hydrophilic monomers were facilely polymerized with the POSS-methacryl substituted (POSS-MA) and aptamer; a highly hydrophilic nature was obtained and the lowest contact angle of 11° was achieved...
January 15, 2019: Analyst
Sahar Foorginezhad, Mohammad Mahdi Zerafat
HYPOTHESIS: Wetting behavior of solid surfaces plays an important role in various industrials and even daily life applications. Controlling the surface wettability through fabricating strongly hydrophilic or hydrophobic properties is achieved by tailoring surface topography and chemical composition. Polyhedral oligomeric silsesquioxanes (POSSs) are a class of hybrid materials with the possibility of hydrophobicity enhancement through simultaneous increase in surface roughness and reduction of surface energy...
January 4, 2019: Journal of Colloid and Interface Science
Joanna Kaźmierczak, Krzysztof Kuciński, Dariusz Lewandowski, Grzegorz Hreczycho
A commercially available and stable ruthenium dodecacarbonyl catalyst (Ru3 (CO)12 ) allows very efficient and convenient access to functionalized silsesquioxanes (SQs) containing siloxane moiety (Si-O-Si) via dehydrogenative coupling of POSS-silanols with hydrosilanes. With the aid of SiH-containing silsesquioxanes, an unprecedented one-pot procedure has been revealed, and the usefulness of this approach was demonstrated by the synthesis of various derivatives via O-silylation, as well as C═C and C═N hydrosilylation...
January 10, 2019: Inorganic Chemistry
Shuhui Gao, Bo Liu, Jie Peng, Kongying Zhu, Yunhui Zhao, Xiaohui Li, Xiaoyan Yuan
Ice accretion poses a severe impact on diverse aspects of human life. Although great efforts have been dedicated to prevent or alleviate ice adhesion to the surface of substrates by developing various icephobic coatings, it is still needed to improve the integrated performance. Herein, we present a novel strategy to prepare polydimethylsiloxane (PDMS) slippage coatings by combining a soft architecture-driven branched PDMS with partial short PDMS-functionalized polyhedral oligomeric silsesquioxane (POSS) as a co-crosslinker, in which silicone oil with certain viscosity was added as a lubricant...
January 2, 2019: ACS Applied Materials & Interfaces
Chun-E Mo, Mei-Hong Chai, Li-Ping Zhang, Rui-Xue Ran, Yan-Ping Huang, Zhao-Sheng Liu
Molecularly imprinted polymers (MIPs) have drawn extensive attention as carriers on drug delivery. However, most of MIPs suffer from insufficient drug loading capacity, burst release of drugs and/or low bioavailability. To solve the issues, this study designed an imprinted material with superior floating nature for oral drug delivery system of capecitabine (CAP) rationally. The MIPs was synthesized in the presence of 4-methylphenyl dicyclohexyl ethylene (liquid crystalline, LC) and polyhedral oligomeric silsesquioxanes (POSS) via polymerization reaction...
December 29, 2018: International Journal of Pharmaceutics
Yeon Ju Kim, Kyu Oh Kim, Jung Jin Lee
We report a new strategy to synthesize hybrid fluorescent nanosensors consisting of phenylboronic acid-functionalized POSS (POSS-PBA) and diol-modified 8-anilino-1-naphthalenesulfonic acid (ANSA (a fluorescent dye)) for the detection of the biologically important d-glucose. The probe was characterized by FT-IR and 1 H NMR analyses, and the photoluminescence intensity was measured under various conditions to confirm its glucose sensing ability. Our POSS-APBA-dye probe could detect glucose at concentrations of 0-20 mg/mL, with a good linear relationship even at low glucose concentrations of 0-1 mg/mL...
February 1, 2019: Materials Science & Engineering. C, Materials for Biological Applications
Wei Zhang, Wenpeng Shan, Shuailin Zhang, Yuchu Liu, Hao Su, Jiancheng Luo, Yanfeng Xia, Tao Li, Chrys Wesdemiotis, Tianbo Liu, Honggang Cui, Yiwen Li, Stephen Z D Cheng
We have designed and synthesized a pair of sequence isomeric giant surfactants based on polystyrene (PS) and polyhedral oligomeric silsesquioxane (POSS) nanoparticles. Although these two macromolecules possess identical compositions as "sequence isomers", the distinctly arranged POSS sequences lead to different molecular packing conformations, and further induce distinguished self-assembly behaviors in DMF/water solutions.
December 17, 2018: Chemical Communications: Chem Comm
Wen-Fang Song, Qing-Li Zhao, Xiu-Jie Zhou, Li-Shun Zhang, Yan-Ping Huang, Zhao-Sheng Liu
A star-shaped molecularly imprinted coating was prepared starting from octavinyl-modified polyhedral oligomeric silsesquioxanes (Ov-POSS). It possesses a relatively open structure and has good site accessibility and a larger capacity even at lower cross-linking. The imprinted coating was prepared from S-amlodipine (S-AML) as the template and analyte, Ov-POSS as the cross-linker, and methacrylic acid as the functional monomer. The preparation and chromatographic parameters were optimized, including ratio of template to functional monomer, apparent cross-linking degree, pH value, ACN content and salt concentration in the mobile phase...
December 15, 2018: Mikrochimica Acta
Jun Wang, Haoran Sun, Haixia Lyu, Zenghong Xie
An organic-silica hybrid monolith was prepared by a single-step ring-opening polymerization of octaglycidyldimethylsilyl polyhedral oligomeric silsesquioxane (POSS-epoxy), poly(ethylenimine) (PEI) and β-cyclodextrin (β-CD) in a ternary porogenic solvent consisting of poly(ethylene glycol) (PEG), 1,4-butanediol and 1-propanol. The framework of POSS-PEI hybrid monolith could offer well-defined 3D skeleton, while β-CD with the ability of forming a host-guest inclusion complexes with a variety of compounds could show an ability of specific selection...
December 12, 2018: Electrophoresis
Krzysztof Kuciński, Grzegorz Hreczycho
A simple and highly practical catalyst-free O-silylation of silanols with commercially available disilazanes has been developed under mild conditions. In the case of POSS silanols and some silanols, it is necessary to use catalytic amounts of inexpensive bismuth(III) triflate as additional catalyst. This efficient chlorine-free protocol involves the synthesis of a wide range of important organosilicon derivatives such as unsymmetrical disiloxanes and functionalized silsesquioxanes.
December 11, 2018: ChemSusChem
Andressa da Cruz Schneid, Antonio Bauer Quevedo, Marcelo Barbalho Pereira, Pedro F Araújo, Noelia Franco, Giovanna Machado, Celso Camilo Moro, Eliana Weber de Menezes, Tania Maria Haas Costa, Edilson Valmir Benvenutti
Anatase nanotubes with high surface area (ca. 350 m2•g-1), containing gold nanoparticles, were successfully obtained from trititanate nanotubes, prepared by a template-free hydrothermal method, and calcined at 450 °C. The high surface area and tubular morphology were attained due to the presence of ionic silsesquioxane, which acts as anti-sintering agent for titania during calcination process, by forming a thin silica coating between anatase nanotubes. Additionally, the ionic silsesquioxane also acts as stabilizing and adhesion agent for gold nanoparticles on the surface of anatase nanotubes...
November 16, 2018: Nanotechnology
Hong-Kai Liu, Li-Jun Ren, Han Wu, Yong-Li Ma, Sven Richter, Michael Godehardt, Christian Kübel, Wei Wang
Cubosomes are bicontinuous cubic-phase particles generated by amphiphile self-assembly with bicontinuous cubic phases, which creates an intricate network of interconnected nanochannels endows these materials with special functions for advanced applications. On the other hand, clusters are an attractive class of molecules that exhibit intriguing functions and properties that differ from those of atoms and nanoparticles. Inspired by lipid self-assembly and attracted to the new functionalities of clusters, we prepared special hetero-cluster Janus dumbbells (HCJDs) composed of dissimilar nanoclusters namely, a polyoxometalate and polyhedral oligomeric silsesquioxane...
December 2, 2018: Journal of the American Chemical Society
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