Dongzhong Chen

Name: 谌东中

Organization: Nanjing University , China

Department: Key Laboratory of Mesoscopic Chemistry of Ministry of Education and Department of Polymer Science and Engineering

Title: NULL(PhD)

TOPICS

Physical Chemistry

Chemicals
References

Self-assembled helical columnar superstructures with selective homochirality

Co-reporter:Bin Mu;Qian Li;Xiao Li;Jian Chen;Jianglin Fang

Polymer Chemistry (2010-Present) 2017 vol. 8(Issue 22) pp:3457-3463

Publication Date(Web):2017/06/06

DOI:10.1039/C7PY00471K

Electron donor–acceptor (EDA) complexes of triphenylene (TP) based side-chain discotic liquid crystalline polymers doped with chiral acceptors exhibit a remarkable supramolecular polymer effect upon reaching a critical doping amount, complying with the discrete columnar stack (DCS) based modular assembly mechanism. Furthermore, selective left- or right-handed homochirality determined by the enantiomeric nature of chiral dopants has been achieved, with a helical polymer backbone surrounded by chiral supramolecular columns through modular assembly between the chiral dopant and DCS subunits, revealing a strong circular dichroism (CD) activity reminiscent of the fascinating hierarchically assembled superstructure of tobacco mosaic virus (TMV). Such polymeric EDA stoichiometric complexation and generation of single-handedness provides inspiring insight into and guidance for constructing various chiral functional materials via non-covalent interactions in a facile way, and also enhances in-depth understanding of the origin of biological helical structures and chiral basis of life.

Discotic columnar liquid-crystalline polymer semiconducting materials with high charge-carrier mobility via rational macromolecular engineering

Co-reporter:Bin Mu;Xingtian Hao;Jian Chen;Qian Li;Chunxiu Zhang

Polymer Chemistry (2010-Present) 2017 vol. 8(Issue 21) pp:3286-3293

Publication Date(Web):2017/05/30

DOI:10.1039/C7PY00364A

Discotic liquid crystal (DLC) polymers in columnar phases are fascinating and promising organic semiconducting materials as they combine the advantages of DLCs with the flexibility and good processability of polymers. Synthetic challenges hinder progress in this area, particularly in the preparation of such polymers in a well-controlled way. A group of butoxy-substituted triphenylene (TP)-based side-chain DLC polymers have been prepared by reversible addition fragmentation chain transfer (RAFT) polymerization via rational macromolecular engineering with particular emphasis on the effects of spacer length and molecular weight. The DLC polymers with shorter alkyl spacers exhibit various ordered columnar LC or columnar plastic phases and easily realize macroscopic homeotropic or planar columnar alignments. Very high hole mobilities over 0.1 cm2 V−1 s−1 are achieved by the well-defined, high-molecular-weight side-chain DLC polymers with shorter spacers, as evaluated by time-of-flight measurements. These high hole mobilities are mainly attributed to positive coupling between the side-chain TP discogens and the polymer backbones. These DLC polymers and the applied macromolecular engineering principles may pave the way for cost-effective, solution-processable organic semiconducting materials for various electronic and optoelectronic device applications.

Competition and compromise between discotic and calamitic mesogens in triphenylene and azobenzene based shape-amphiphilic liquid crystals

Co-reporter:Shi Pan, Bin Mu, Yang Zhou, Qian Li, Bin Wu, Jianglin Fang and Dongzhong Chen

RSC Advances 2016 vol. 6(Issue 55) pp:49556-49566

Publication Date(Web):04 May 2016

DOI:10.1039/C6RA05654G

Clarifying the relationship and interplay between disc-like (discotic) and rod-like (calamitic) mesogens is highly appealing. In this article, a series of novel disc-rod shaped amphiphilic liquid crystalline dimers and side-chain polymers based on typical discotic triphenylene (TP) and calamitic azobenzene (AZO) mesogens have been well synthesized and systematically investigated. It was found that lamello-columnar mesophases were characteristic for disc-rod hybrids and bridge the lamellar and columnar phases typical for calamitic or discotic mesogens alone. For the TP6 based hybrid dimers with peripheral hexyloxy substituents, the phase structure evolves from a sequence of lamello-columnar mesophases Colr/L and slim ColSr/L for dimers TP6–AZO6 and TP6–AZO8 with shorter hexyloxy or octyloxy tails attached on AZO, to a single Colr/L mesophase persisting to lower temperature for TP6–AZO12 and TP6–AZO16 with longer dodecyloxy or hexadecyloxy tails. With the extension of TP peripheral substituents to decyloxy, although TP10–AZO12 exhibits only a stable lamello-columnar mesophase Colr/L, the TP10–AZO6 represents an ideal sample of majority discotic moieties and just the right calamitic fraction, which demonstrates a fascinating phase transformation from a simple lamellar phase to a disordered oblique columnar phase Colob-d through an intermediate lamello-columnar mesophase Colr/L. Although the methacrylate monomer derived from the hybrid TP6–AZO10 exhibits similar lamello-columnar mesophase Colr/L, the corresponding polymer displays only a simple lamellar phase due to the constraint of the polymethacrylate backbone. The elucidation of complex self-assembly behavior and in-depth understanding of the competition and compromise between different shape aromatic moieties in disc-rod shaped amphiphiles is of crucial importance for clarifying the aromatic interactions involved in complex biological systems and guiding molecular design of advanced organic materials for various optoelectronic applications.

Well-Defined Pillararene-Based Azobenzene Liquid Crystalline Photoresponsive Materials and Their Thin Films with Photomodulated Surfaces

Co-reporter:Shi Pan;Mengfei Ni;Bin Mu;Qian Li;Xiao-Yu Hu;Chen Lin;Leyong Wang

Advanced Functional Materials 2015 Volume 25( Issue 23) pp:3571-3580

Publication Date(Web):

DOI:10.1002/adfm.201500942

Photoresponsive materials (PRMs) have long been a hot topic and photo-modulated smart surface is very appealing. Particularly, liquid crystalline PRMs are able to amplify and stabilize photoinduced orientation thanks to their self-assembling and ordering characteristics. Herein, the first pillararene-based azobenzene liquid crystalline PRM with well-defined structure is presented, which can avoid the usually ill-defined composition drawback of polymer PRMs and prevent the severe H-aggregation from suppressing or even completely blocking photoresponse in simple azobenzene derivatives. The pillar[5]arene-based macrocyclic azobenzenes with variant length spacers show wide temperature range smectic liquid crystalline mesophases and excellent film-formation property. The tubular pillar[5]arene macrocyclic framework provides sufficient free volume for azobenzene moieties to achieve reversible photoisomerization and photoalignment; thus, their thin films demonstrate excellent light-triggered modulation of surface free energy, wettability, and even photoalignment-mediated orientation of an upper layer discotic liquid crystal columnar mesophase. Such pillararene-based azobenzene liquid crystals represent novel and promising PRMs with extensive fascinating applications.

Broad Hexagonal Columnar Mesophases Formation in Bioinspired Transition-Metal Complexes of Simple Fatty Acid meta-Octaester Derivatives of meso-Tetraphenyl Porphyrins

Co-reporter:Dr. Bin Wu;Keyang Chen;Yuchen Deng;Jian Chen;Dr. Chengjie Liu; Rongshi Cheng ;Dr. Dongzhong Chen

Chemistry - A European Journal 2015 Volume 21( Issue 9) pp:3671-3681

Publication Date(Web):

DOI:10.1002/chem.201404708

Abstract

A series of meta-substituted fatty acid octaester derivatives and their transition-metal complexes of meso- tetraphenyl porphyrins (TPP-8OOCR, with R=C_n−1H_2n−1, n=8, 12, or 16) have been prepared through very simple synthesis protocols. The thermotropic phase behavior and the liquid crystalline (LC) organization structures of the synthesized porphyrin derivatives were systematically investigated by a combination of differential scanning calorimetry (DSC), polarized optical microscopy (POM), and variable-temperature small-angle X-ray scattering/wide-angle X-ray scattering (SAXS/WAXS) techniques. The shorter octanoic acid ester substituted porphyrin (C8-TPP) did not show liquid crystallinity and its metal porphyrins exhibited an uncommon columnar mesophase. The lauric acid octaester (C12-TPP) and the palmitic acid octaester (C16-TPP) series porphyrins generated hexagonal columnar mesophase Col_h. Moreover, the metal porphyrins C12-TPPM and C16-TPPM with M=Zn, Cu, or Ni, exhibited well-organized Col_h mesophases of broad LC temperature ranges increasing in the order of TPPNi<TPPCu≤TPPZn with their increased effective ionic radii in the square-planar coordination. The simplicity in synthesis, the well intercolumnar organization of Col_h mesophase, the broadness of the discotic LC range, and the specific UV/Vis absorption and fluorescence emission behaviors make the symmetrically substituted fatty acid octaester porphyrins and their metal complexes very attractive for variant applications.

Hierarchical Self-Organization and Uniaxial Alignment of Well Synthesized Side-Chain Discotic Liquid Crystalline Polymers

Co-reporter:Bin Mu, Bin Wu, Shi Pan, Jianglin Fang, and Dongzhong Chen

Macromolecules 2015 Volume 48(Issue 8) pp:2388-2398

Publication Date(Web):April 10, 2015

DOI:10.1021/acs.macromol.5b00415

Liquid crystalline polymers (LCPs) combine the attributes of liquid crystals and polymers, while discotic LCPs have been less developed in sharp contrast to their calamitic counterparts mainly due to lack of suitable discotic LCP materials. Here we successfully prepared a series of well-defined triphenylene (TP) based discotic LC polyacrylates via reversible addition–fragmentation chain-transfer (RAFT) polymerization for the first time, and through a combination of multiple analysis techniques and phase transition kinetics study, a remarkable molecular weight effect or polymer effect at a critical degree of polymerization (DP) around 20 has been disclosed. Moreover, the first proposed discrete columnar stacks (DCS) based hierarchical self-organization model accounts well for the formation and transformation of ordered hexagonal columnar lattice Colho dominated by side-chain TP stacking and oblique columnar superlattice Colob-s induced by compaction and ordering of polymer backbones. The in-depth understanding of their superstructures and readily achieved uniaxial alignment pave the way for the rational design and preparation of such kind of solution processable cutting-edge polymeric semiconducting materials and may boost various fascinating optoelectronic applications.

Well-Organized Columnar Superlattices via Positive Coupling between Polymer Backbone and Discotic Side Groups

Co-reporter:Bin Mu, Shi Pan, Huafeng Bian, Bin Wu, Jianglin Fang, and Dongzhong Chen

Macromolecules 2015 Volume 48(Issue 19) pp:6768-6780

Publication Date(Web):September 16, 2015

DOI:10.1021/acs.macromol.5b01510

Very little is known about some fundamental issues such as the spacer length influence and molecular weight (MW) effect of discotic liquid crystalline polymers (DLCPs), despite the elucidation of such aspects are of crucial importance for their structure tuning and device performance. Here in this article, a systematic comparative study has been conducted to investigate the MW effect and especially gain a deeper insight into the spacer length influence of side-chain DLCPs based on a homologous series of well-defined discotic liquid crystalline polyacrylates with triphenylene (TP) side groups of variant spacer lengths. The series DLCPs of shorter spacers display various well-organized columnar superlattices based on multicolumn bundles organization with “coordination number” from two to six through individual discogens or discrete columnar stack (DCS)-based intracolumnar stacking modes. It is disclosed for the first time that the positive coupling effect (PCE) prevails in side-chain DLCPs, and proper coupling between discotic side groups and polymer backbone is desirable and required for achieving well-organized ordered columnar mesophases, in striking contrast with the renowned classical spacer decoupling principle directing the fruitful exploration of their side-chain calamitic counterparts for several decades. These findings are inspiring for in-depth understanding of self-assembly of aromatic interactions involved complex functional chemical and biological systems and especially opening an avenue for rational design and synthesis of well-controlled side-chain DLCPs for low-cost solution processable optoelectronic device applications.

Formation of persistent ordered lamellar mesophases in azobenzene-containing silver thiolates and their application in the controlled synthesis of silver nanomaterials

Co-reporter:Junfei Duan, Jie Ma, Bin Wu, Qian Li, Jianglin Fang and Dongzhong Chen

Journal of Materials Chemistry A 2014 vol. 2(Issue 13) pp:2375-2386

Publication Date(Web):10 Jan 2014

DOI:10.1039/C3TC32380C

Metal thiolates have aroused intensive interest mainly due to their precursor-based preparation of nanostructured metal or metal chalcogenides. In this paper, a series of azobenzene-containing thiol ligands with different length alkoxy tails and their corresponding silver thiolates AgS–C10H20–Ph–NN–Ph–OCnH2n+1 with n = 1, 6, 8, 12, have been successfully synthesized, and their thermal properties and phase behavior have been systematically investigated by differential scanning calorimetry (DSC), variable-temperature SAXS/WAXS and temperature dependent FTIR. By introducing azobenzene mesogen for the first time into the silver thiolates, ordered lamellar liquid crystalline mesophases persisting throughout a higher temperature have been achieved derived from their specific orthorhombic crystalline structures, which are in sharp contrast to the micellar or hexagonal columnar mesophases reported for silver alkane thiolates with a longer aliphatic alkyl chain AgSCmH2m+1 (m ≥ 12) owing to the interplay of azobenzene mesogen π–π stacking and the inorganic skeleton binding of a Ag–S slab. Furthermore, the intermediate nanoparticles formation and silver nanodisks preparation through an in situ thermolytic reaction based on such mesogenic precursors have been demonstrated in principle. As a kind of functional metallomesogen precursor the silver mesogenic thiolates with persistent ordered lamellar mesophases provide an ideal two-dimensional (2D) confined environment for the investigation of a layered-precursor-to-lamellar-nanomaterial (LPLM) mechanism of solventless thermolysis and the fascinating controlled preparation of variant 2D shaped metal or metal sulfide nanomaterials.

Azobenzene mesogen-passivated gold nanoparticles: Controlled preparation, self-organized superstructures, thermal behavior and photoisomerization

Co-reporter:Junfei Duan, Meng Wang, Huafeng Bian, Yang Zhou, Jie Ma, Chengjie Liu, Dongzhong Chen

Materials Chemistry and Physics 2014 Volume 148(Issue 3) pp:1013-1021

Publication Date(Web):15 December 2014

DOI:10.1016/j.matchemphys.2014.09.012

•Gold nanoparticles (GNPs) coated with azobenzene thiol ligands have been prepared.•The hybrid GNPs with alkyl thiol co-ligands show enhanced thermolysis resistance.•The hybrid GNPs exhibit lamellar or hexagonal columnar superstructures.•The solid-state films of the hybrid GNPs display reversible photoresponse.Liquid crystal nanoscience has aroused intensive interests mainly due to their unique and collective properties and a variety of potential applications. In this paper, gold nanoparticles (GNPs) coated with alkoxy azobenzene mesogenic thiol ligands of different length polymethylene spacer and linear alkyl thiol co-ligands have been prepared. The thermal properties, phase behavior of thus obtained hybrid GNPs and photophysical properties of their solid-state films have been investigated by differential scanning calorimetry (DSC), variable-temperature small and wide angle X-ray scattering (SAXS/WAXS) and UV–vis spectroscopy. The hybrid GNPs exclusively passivated with azobenzene mesogenic ligands showed lamellar structure while those with mixed ligands exhibited hexagonal columnar superstructure, and the latter complex hybrid GNPs exhibited noticeably improved thermolysis resistance. Moreover, it is very interesting that the solid-state films of the hybrid GNPs displayed reversible photoresponse owing to the trans–cis transformation of azobenzene mesogenic ligands, and compared with the hybrid GNPs coated with mesogenic ligands only, those with mixed ligands exhibited faster photoisomerization rate upon alternate UV and visible light irradiation, which may have some promising applications.Gold nanoparticles (GNPs) coated with azobenzene mesogenic thiol ligands and linear alkyl thiol co-ligands have been prepared showing lamellar or hexagonal columnar superstructures. The complex hybrid GNPs with co-ligands exhibit much improved thermolysis resistance and the solid-state films of the hybrid GNPs display interesting reversible photoisomerization.

Universal Phase Transformation Mechanism and Substituted Alkyl Length and Number Effect for the Preparation of Overbased Detergents Based on Calcium Alkylbenzene Sulfonates

Co-reporter:Zhaocong Chen, Feng Chen, and Dongzhong Chen

Industrial & Engineering Chemistry Research 2013 Volume 52(Issue 36) pp:12748-12762

Publication Date(Web):2017-2-22

DOI:10.1021/ie401415s

Overbased calcium sulfonate is one of the largest commercially produced nanomaterials; the phase transformation mechanism involved in the key process of carbonation reaction for overbased detergent preparation has not yet been fully understood. Following our previous investigation based on the heavy alkylbenzene sulfonate (HABS) surfactant of industrial byproduct, two commercial products with well-defined chemical compositions and structures, long-chain alkylbenzene sulfonate (LCABS) and comparative short-chain linear alkylbenzene sulfonate (SLABS), are employed in this study as model surfactants for further mechanism study of this pivotal process by the combination of analytical techniques such as potentiometric titration, DLS, TEM, FTIR, and XRD. It has been demonstrated that amorphous calcium carbonate (ACC) is a prerequisite for the preserving and stabilization of the alkaline reserve, especially under thermal work environment. The phase transformation from ACC to crystalline vaterite polymorph rather than calcite has been unambiguously confirmed as a universal mechanism for all the alkylbenzene sulfonate based systems. Furthermore, the length and number of alkyl tails of alkylbenzene sulfonate surfactants exhibit a strong influence on characteristics of detergent products. The LCABS with long-chain alkyl substituents or HABS with dialkyl substituents plays an important role not only in inhibiting the agglomeration process, but also in protecting the metastable inorganic cores from fusion to avoid phase transformation. Such understanding should be of crucial importance for guiding the preparation of overbased detergents and greases. In addition, the study on the influence of the molar ratio of calcium oxide in the total alkaline calcium salts and the dosage of surfactant LCABS, promoter methanol, and catalyst anhydrous calcium chloride help to determine the suitable work window for detergent production, and moreover, the water content provides a handle for better understanding the reaction process and achieving good quality control for detergent manufacturing.

Triphenylene-Based Side Chain Liquid Crystalline Block Copolymers Containing a PEG block: Controlled Synthesis, Microphase Structures Evolution and Their Interplay with Discotic Mesogenic Orders

Co-reporter:Bin Wu, Bin Mu, Sai Wang, Junfei Duan, Jianglin Fang, Rongshi Cheng, and Dongzhong Chen

Macromolecules 2013 Volume 46(Issue 8) pp:

Publication Date(Web):April 5, 2013

DOI:10.1021/ma400655t

Triphenylene (TP) derivatives are typical and probably the most widely studied discotic liquid crystalline (DLC) materials. Through polymer analogous reactions to attach TP mesogens to the well-synthesized poly(ethylene glycol)-b-poly(2-hydroxyethyl acrylate) (PEG–PHEA) by ATRP, a series of well-defined side chain DLC diblock copolymers PEG–poly(TPm) (m = 6 or 10) with DLC block weight fraction (fw,DLC) ranging from 37% to 90% have been successfully prepared with narrow molecular weight distribution (PDI ≤ 1.11). An intriguing microphase-separated superstructure evolution and the correlation between overall morphologies and discotic mesogenic orders as a function of fw,DLC and temperature have been demonstrated by combination of DSC, POM, and variable temperature SAXS/WAXS. Those copolymers with lower DLC contents (fw,DLC = 37% and 43%) and at lower temperatures formed lamellar structures of variant periods and underwent order–order transitions upon PEG region crystallization at 45 °C and different discotic mesophases of ND or Ncol transition at about 25 °C. For the copolymer with intermediate fw,DLC = 62%, a high temperature hexagonal packed cylinder (HPC) structure of amorphous PEG nanocylinders in the matrix of DLC was formed above 35 °C, while upon cooling below 35 °C it turned into a mixed lamellar structure with PEG region crystallization. The higher fw,DLC (67% ∼ 80%) copolymers exhibited HPC structures with the DLC matrix showing Ncol or ND mesophases. For copolymers with the highest fw,DLC around 90%, an overall ND phase was developed in sharp contrast to the ordered columnar phase formed by their corresponding DLC homopolymers, which was quite inspiring and might suggest another pathway of attaining this important nematic discotic phase through introducing a suitable copolymerized block. The better understanding of the interrelation of microstructures and discotic mesogenic orders constitutes the key basis for utilizing such type of organic semiconductor materials and could help to guide the design of complex DLC polymer materials with hierarchical structures for variant applications.

Rational design, syntheses, characterization and solution behavior of amphiphilic azobenzene-containing linear-dendritic block copolymers

Co-reporter:Zehua Shi, Huanjun Lu, Zhaocong Chen, Rongshi Cheng, Dongzhong Chen

Polymer 2012 Volume 53(Issue 2) pp:359-369

Publication Date(Web):24 January 2012

DOI:10.1016/j.polymer.2011.11.047

In this paper, based on the synthesis of precursor linear-dendritic block copolymers (LDBCs) with a linear poly(ethylene glycol) (PEG) block of molecular weight around 2000 and dendritic polyamidoamine (PAMAM) segments of generation G0 to G3, a series of azobenzene-containing amphiphilic LDBCs mPEG-dendr[PAMAM-(AZO)n] (n = 2, 4, 8, 16) have been successfully prepared in moderate yields 45–60%, through complete Michael addition between the peripheral amine groups of dendritic segment and the reactive azobenzene acrylate mesogen units bearing octyloxy tails and flexible decylmethylene spacers. The purified copolymers have been characterized and confirmed by NMR, FT-IR, MALDI-TOF MS, and GPC showing narrow molecular weight distribution in the range 1.09–1.20. A generation-dependent polymeric micellar aggregation behavior of thus obtained amphiphilic LDBCs from nanofibers of uniform diameter around 20 nm to nanospheres/oval sheets, vesicles, and porous large compound micelles (LCMs) of micrometer size has been demonstrated in selective solvent mixture of dioxane/water. Furthermore, photoisomerization transformation of these azobenzene-containing LDBCs and their kinetics of reversible trans-cis-trans photochemical transitions in THF solution have also been investigated, the measured trans-cis photoisomerization rate constant 0.0240 s−1 for G3 copolymer is twice of the 0.0127 s−1 determined for the precursor azobenzene compound, manifesting a kind of promising photoresponsive copolymer materials.

Calcium carbonate phase transformations during the carbonation reaction of calcium heavy alkylbenzene sulfonate overbased nanodetergents preparation

Co-reporter:Zhaocong Chen, Shan Xiao, Feng Chen, Dongzhong Chen, Jianglin Fang, Min Zhao

Journal of Colloid and Interface Science 2011 Volume 359(Issue 1) pp:56-67

Publication Date(Web):1 July 2011

DOI:10.1016/j.jcis.2011.03.086

The preparation and application of overbased nanodetergents with excess alkaline calcium carbonate is a good example of nanotechnology in practice. The phase transformation of calcium carbonate is of extensive concern since CaCO3 serves both as an important industrial filling material and as the most abundant biomineral in nature. Industrially valuable overbased nanodetergents have been prepared based on calcium salts of heavy alkylbenzene sulfonate by a one-step process under ambient pressure, the carbonation reaction has been monitored by the instantaneous temperature changes and total base number (TBN). A number of analytical techniques such as TGA, DLS, SLS, TEM, FTIR, and XRD have been utilized to explore the carbonation reaction process and phase transformation mechanism of calcium carbonate. An enhanced understanding on the phase transformation of calcium carbonate involved in calcium sulfonate nanodetergents has been achieved and it has been unambiguously demonstrated that amorphous calcium carbonate (ACC) transforms into the vaterite polymorph rather than calcite, which would be of crucial importance for the preparation and quality control of lubricant additives and greases. Our results also show that a certain amount of residual Ca(OH)2 prevents the phase transformation from ACC to crystalline polymorphs. Moreover, a vaterite nanodetergent has been prepared for the first time with low viscosity, high base number, and uniform particle size, nevertheless a notable improvement on its thermal stability is required for potential applications.Graphical abstractAmorphous calcium carbonate (ACC) transforms into the crystalline vaterite polymorph as Ca(OH)2 is depleted during carbonation, with particle diameter increasing sharply from less than 10 to around 30 nm.Highlights► Residual Ca(OH)2 rather than CaCl2 stabilizes amorphous calcium carbonate (ACC). ► ACC transforms into vaterite rather than calcite once carbonation is completed. ► Understanding phase transformation enhances quality control of lubricant additives. ► Overbased nanodetergents in vaterite form of low viscosity obtained for the first time.

Syntheses, Phase Behavior, Supramolecular Chirality, and Field-Effect Carrier Mobility of Asymmetrically End-Capped Mesogenic Oligothiophenes

Co-reporter:Qingwei Meng Dr.;Xiao-Hua Sun Dr.;Zhengyu Lu;Ping-Fang Xia;Zehua Shi Dr.;ManShing Wong Dr.;Salem Wakim Dr.;Jianping Lu Dr.;Jean-Marc Baribeau Dr.;Ye Tao Dr.

Chemistry - A European Journal 2009 Volume 15( Issue 14) pp:3474-3487

Publication Date(Web):

DOI:10.1002/chem.200802470

Hyperbranched Polyesters with Carboxylic or Sulfonic Acid Functional Groups for Crystallization Modification of Calcium Carbonate

Co-reporter:Qingwei Meng;Liwan Yue;Jianglin Fang;Hui Zhao;Lili Wang

Macromolecular Chemistry and Physics 2007 Volume 208(Issue 5) pp:474-484

Publication Date(Web):13 MAR 2007

DOI:10.1002/macp.200600466

Hyperbranched aliphatic polyesters functionalized with carboxylic or sulfonic acid groups have been synthesized and employed as crystallization modifiers for calcium carbonate. The functionalized polyesters exhibit remarkable polymorph selectivity and morphology control. Stable spherical vaterite particles of diameter less than 10 µm with narrow size distribution were easy to produce on a large scale. With an increase in the concentration and monomer/core ratio of the polyester, the vaterite content increases accordingly with promoted morphology control to monodisperse spheres. The CaCO₃ concentration and the initial pH can also influence the morphology and polymorphism of the produced calcium carbonate. Under certain conditions, well-defined core-shell structured vaterite spheres are obtained with obvious radial organization by nano-aggregation of about 70 ± 10 nm crystallites, which may mediate and combine the nano-aggregation and crystal growth formation mechanism of vaterite polymorph.

Macromol. Chem. Phys. 5/2007

Co-reporter:Qingwei Meng;Liwan Yue;Jianglin Fang;Hui Zhao;Lili Wang

Macromolecular Chemistry and Physics 2007 Volume 208(Issue 5) pp:

Publication Date(Web):13 MAR 2007

DOI:10.1002/macp.200790008

Cover: The cover shows a SEM image of core/shell spherical vaterite particles produced in the presence of the schematically drawn hyperbranched polyesters with carboxylic acid functional groups. Further details can be found in the Full Paper by Q. Meng, D. Chen,* L. Yue, J. Fang, H. Zhao, and L. Wang on page 474.

Formation of persistent ordered lamellar mesophases in azobenzene-containing silver thiolates and their application in the controlled synthesis of silver nanomaterials

Co-reporter:Junfei Duan, Jie Ma, Bin Wu, Qian Li, Jianglin Fang and Dongzhong Chen

Journal of Materials Chemistry A 2014 - vol. 2(Issue 13) pp:NaN2386-2386

Publication Date(Web):2014/01/10

DOI:10.1039/C3TC32380C

2-Propenoic acid, 10-[[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]decyl ester

CAS:1808924-17-5

2-Propenoic acid, 10-[[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]decyl ester

2-Propenoic acid, 3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl ester

CAS:1808924-06-2

2-Propenoic acid, 3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl ester

2-Propenoic acid, [[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]methyl ester

CAS:1808924-07-3

2-Propenoic acid, [[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]methyl ester

2-Propenoic acid, 3-[[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]propyl ester

CAS:1808924-09-5

2-Propenoic acid, 3-[[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]propyl ester

2-Propenoic acid, 4-[[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]butyl ester

CAS:1808924-10-8

2-Propenoic acid, 4-[[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]butyl ester

2-Propenoic acid, 5-[[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]pentyl ester

CAS:1808924-11-9

2-Propenoic acid, 5-[[3,6,7,10,11-pentakis(hexyloxy)-2-triphenylenyl]oxy]pentyl ester

Hexacyclo[21.2.2.23,6.28,11.213,16.218,21]pentatriaconta-3,5,8,10,13,15,18,20,23,25,26,28,30,32,34-pentadecaene, 4,5,9,10,14,15,19,20,24,25-decakis(2-propyn-1-yloxy)-

CAS:1315310-81-6

Hexacyclo[21.2.2.23,6.28,11.213,16.218,21]pentatriaconta-3,5,8,10,13,15,18,20,23,25,26,28,30,32,34-pentadecaene, 4,5,9,10,14,15,19,20,24,25-decakis(2-propyn-1-yloxy)-