The zeta potential of PMMA in contact with electrolytes of various conditions: Theoretical and experimental investigation

Falahati, Hamid; Wong, Lambert; Davarpanah, Leila; Garg, Abhinandan; Schmitz, P. Michael; Barz, Dominik P. J.

doi:10.1002/elps.201300436

Cited by 43 publications

(51 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5b, we demonstrate the influence of a lowered electrostatic surface potential at otherwise constant conditions on the swimming behavior. We compare the swimming speeds of complexes formed of IEX15 and PS15 on uncoated glass slides ( = -110 mV, see SI) and on Perspex slides ( = -30 mV 38 ). Fig.…”

Section: Influence Of Experimental Boundary Conditionsmentioning

confidence: 99%

Assembly and Speed in Ion-Exchange-Based Modular Phoretic Microswimmers

et al. 2017

View full text Add to dashboard Cite

We report an experimental study on ion-exchange-based modular microswimmers in low-salt water. Cationic ion-exchange particles and passive cargo particles assemble into self-propelling complexes, showing self-propulsion at speeds of several micrometers per second over extended distances and times. We quantify the assembly and speed of the complexes for different combinations of ion-exchange particles and cargo particles, substrate types, salt types and concentrations, and cell geometries. Irrespective of the experimental boundary conditions, we observe a regular development of the assembly shape with increasing number of cargo. Moreover, the swimming speed increases stepwise upon increasing the number of cargo and then saturates at a maximum speed, indicating the active role of cargo in modular swimming. We propose a geometric model of self-assembly to describe the experimental observations in a qualitative way. Our study also provides some constraints for future theoretical modeling and simulation.

show abstract

Section: Influence Of Experimental Boundary Conditionsmentioning

confidence: 99%

Assembly and Speed in Ion-Exchange-Based Modular Phoretic Microswimmers

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The potential reached at 1 wk was comparable to poly(methyl methacrylate) measured under similar ionic strength and pH conditions, suggesting that, upon release of soluble silica from the condensed TEOS, a polymer rich layer was formed on the surface of the hybrid. 72,73 In addition, Zainuddin et al demonstrated by 1 H NMR that in presence of Ca 2+ , the ester groups of polymethacrylates can form a ion-dipole complex, inducing calcification. 74 This corroborates the drop observed in ζ -potential as the complexation of cations lowers the potential but also gives an insight on the mechanism Ca-P nucleation onto the surface of the hybrid, which is preferential on negatively charge surfaces.…”

Section: Calcium-phosphate Nucleationmentioning

confidence: 99%

Ductile silica/methacrylate hybrids for bone regeneration

Maçon

Chung

et al. 2016

J. Mater. Chem. B

View full text Add to dashboard Cite

BioglassR was the first synthetic material capable of bonding with bone without fibrous encapsulation, and fulfils some of the criteria of an ideal synthetic bone graft. However, it is brittle and toughness is required. Here, we investigated hybrids consisting of co-networks of high crosslinking density polymethacrylate and silica (class II hybrid) as a potential new generation of scaffold materials. Poly(3-(methoxysilyl)propyl methacrylate) (pTMSPMA) and tetraethyl orthosilicate (TEOS) were used as sol-gel precursors and hybrids were synthesised with different inorganic to organic ratios (I h ). The hybrids were nanoporous, with a modal pore diameter of 1 nm. At I h = 50 %, the release of silica was controlled by varying the molecular weight of pTMSPMA while retaining a specific surface area above 100 m 2 g −1 . Strain to failure increased to 14.2 %, for I h = 50 % using a polymer of 30 kDa, compared to 4.5 % for pure glass. The modulus of toughness (U T ) increased from 0.73 (pure glass) to 2.64 GPa. Although, the hybrid synthesised in this report did not contain calcium, pTMSPMA/SiO 2 hybrid was found to nucleate bone-like mineral on its surface after 1 week of immersion in simulated body fluid (SBF), whereas pure silica sol-gel glass did not. This increase in apatite forming ability was due to the ion-dipole complexation of calcium with the ester moieties of the polymer that were exposed after release of soluble silica from TEOS. No adverse cytotoxicity for MC3T3-E1 osteoblast-like cells was detected and improved cell attachment was observed, compared to a pure silica gel. pTMSPMA/SiO 2 hybrids have potential for the regeneration of hard tissue as they overcome the major drawbacks of pure inorganic substrates while retaining cell attachment.Bone is the second most transplanted tissue after blood and musculoskeletal pathology treatments represent £10 billion per year in the U.K. alone. 1,2 Effective alternatives must be found to the current methods of skeletal defect treatments to avoid postoperation infection or revision, which can cost up to £70,000 per patient. 3 One attractive approach is to design biodegradable implants that could actively promote the bone growth and tissue remodelling by stimulating cellular activities whilst providing a mechanical support to the tissue. 4 Bioglass R (BG), a biodegradable bioactive silicate glass (46.1 mol % SiO 2 , 26.9 mol % CaO, 24.2 mol % Na 2 O, 2.6 mol % P 2 O 5 ), was the first material capable of bonding with bone by the formation of an apatite layer that forms on its surface after grafting. 5 A second mode of action is its dissolution products (in particular silica), which enhance osteoblast activities, whilst promoting extra- * Corresponding author, E-mail: julian.r.jones@imperial.ac cellular matrix (ECM) production and cells differentiation. 6-8 3D scaffolds have been produced from bioactive glasses, with interconnected pore networks in the form of foams 9,10 or 3-D printed structures 11 , which can take load in compression, up to 150 MPa when 3D printed. 12 ...

show abstract

“…The addition of NaCl to the samples also decreases the absolute values of the micelle's zeta potential. This decrease is mainly related to shielding of the surface charge by the electrolyte counter‐ion .…”

Section: Discussionmentioning

confidence: 99%