Hydrophilic surface modification of poly(methyl methacrylate)-based ocular prostheses using poly(ethylene glycol) grafting

Ko, JaeSang,Cho, Kanghee,Han, Sang Won,Sung, Hyung Kyung,Baek, Seung Woon,Koh, Won-Gun,Yoon, Jin Sook Elsevier 2017 Colloids and surfaces Biointerfaces Vol.158 No.-

<P><B>Abstract</B></P> <P>Ocular prostheses are custom-made polymeric inserts that can be placed in anophthalmic sockets for cosmetic rehabilitation. Prosthetic eye wearers have reduced tear amount, and they often experience dry eye symptoms including dryness, irritation, discomfort, and discharge. Most modern ocular prostheses are made of poly(methyl methacrylate) (PMMA), which is highly hydrophobic. Previous research has shown that improving the wettability of contact lens materials decreases its wearers discomfort by increasing lubrication. Therefore, hydrophilic modification of PMMA-based ocular prostheses might also improve patient discomfort by improving lubrication. We modified the surfaces of PMMA-based ocular prostheses using poly(ethylene glycol) (PEG), which is hydrophilic. To do this, we used two strategies. One was a “grafting from” method, whereby PEG was polymerized from the PMMA surface. The other was a “grafting to” method, which involved PEG being covalently bonded to an amine-functionalized PMMA surface. Assessments involving the water contact angle, ellipsometry, and X-ray photoelectron spectroscopy indicated that PEG was successfully introduced to the PMMA surfaces using both strategies. Scanning electron microscopy and atomic force microscopy images revealed that neither strategy caused clinically significant alterations in the PMMA surface morphology. In vitro bacterial adhesion assessments showed that the hydrophilic modifications effectively reduced bacterial adhesion without inducing cytotoxicity. These results imply that hydrophilic surface modifications of conventional ocular prostheses may decrease patient discomfort and ocular prosthesis-related infections.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Surfaces of PMMA-based ocular prosthesis were modified via PEG grafting. </LI> <LI> The hydrophilic surface modifications effectively inhibited bacterial adhesion. </LI> <LI> These modifications of ocular prostheses may decrease discomfort and infections. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

RF plasma based selective modification of hydrophilic regions on super hydrophobic surface

Lee, J.,Hwang, S.,Cho, D.H.,Hong, J.,Shin, J.H.,Byun, D. New York] ; North-Holland 2017 APPLIED SURFACE SCIENCE - Vol.394 No.-

Selective modification and regional alterations of the surface property have gained a great deal of attention to many engineers. In this paper, we present a simple, a cost-effective, and amendable reforming method for disparate patterns of hydrophilic regions on super-hydrophobic surfaces. Uniform super-hydrophobic layer (Contactangle; CA>150<SUP>o</SUP>, root mean square (RMS) roughness ~0.28nm) can be formed using the atmospheric radio frequency (RF) plasma on top of the selective hydrophilic (CA~70<SUP>o</SUP>, RMS roughness ~0.34nm) patterns imprinted by electrohydrodynamic (EHD) jet printing technology with polar alcohols (butyl carbitol or ethanol). The wettability of the modified surface was investigated qualitatively utilizing scanning electron microscopy (SEM), atomic force microscopy (AFM), and wavelength scanning interferometer (WSI). Secondary ion mass spectroscopy (SIMS) analysis showed that the alcohol addiction reaction changed the types of radicals on the super-hydrophobic surface. The wettability was found to depend sensitively on chemical radicals on the surface, not on surface morphology (particle size and surface roughness). Furthermore, three different kinds of representative hydrophilic samples (polystyrene nano-particle aqueous solution, Salmonella bacteria medium, and poly(3,4-ethylenediocythiophene) ink) were tested for uniform deposition onto the desired hydrophilic regions. This simple strategy would have broad applications in various research fields that require selective deposition of target materials.

다양한 표면개질을 이용한 폴리에테르설폰 막의 친수성 향상

박소정(So Jung Park),황준석(Jun Seok Hwang),최원길(Won Kil Choi),이형근(Hyung Keun Lee),허강무(Kang Moo Huh) 한국고분자학회 2014 폴리머 Vol.38 No.2

본 연구에서는 폴리에테르설폰(polyethersulfone, PES)을 연소배가스에 포함된 수증기를 분리 및 회수하기 위한 고분자 분리막 소재로 사용하기 위해 다양한 물리·화학적 표면개질 방법을 사용하여 PES 평막 표면의 친수성을향상시키고자 하였다. 균일한 PES 평막을 제조한 후 친수성 향상을 위한 개질 방법으로 산처리, 블렌딩 및 플라즈마 처리를 통해 표면개질을 하였고, 표면 특성을 비교하였다. PES 평막 표면의 특성 변화는 ATR-FTIR, XPS, SEM및 접촉각 측정을 통해 관찰하였다. 황산을 이용한 산처리 방법과 양친매성 고분자를 이용한 블렌딩 방법에 의해개질된 PES 평막에서는 접촉각의 변화가 크지 않았다. Ar 플라즈마 처리를 한 경우, 플라스마 처리 시간이 증가함에 따라 PES 표면의 친수성이 크게 증가하는 것을 확인할 수 있었다. 본 결과를 통해 다양한 표면개질 방법 중 플라즈마 방법을 적용하여 PES 표면을 처리하는 것이 PES 막 표면의 친수성 향상에 가장 효과적임을 확인하였다. Polyethersulfone (PES) membranes were modified by various physico-chemical modification methods to enhance the surface hydrophilicity for application as a separation membrane to separate and collect water vapor from the flue gas. Homogeneous PES flat-sheet membranes were prepared and modified by acid treatment, blending and plasma treatment for hydrophilic surface modification. The surface characteristics of the modified PES membranes were eval-uated by ATR-FTIR, XPS, SEM and contact angle measurements. No significant change in hydrophilicity was observed for the PES membranes modified by acid treatment with sulfuric acid or blending with various compositions of polox-amer as an amphiphilic PEO-PPO-PEO tri-block copolymer. On the other hand, Ar plasma treatment led to a significant increase in the hydrophilicity of the surface, depending on the plasma treatment time. As a result, the PES membrane could be the most efficiently surface-treated by applying the plasma treatment for enhancing their surface hydrophilicity.

The modification of silica using phenyl trimethoxysilane(PTMS)

강태호,오성근 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

The surface property of colloidal nanosilica(SiO2) nanospheres is regulated by modification with organoalkoxysilane, such as mercapto propyl trimethoxysilane (MPTMS), 3-aminopropyl trimethoxysilane (APTMS),phenyl trimethoxysilane(PTMS), 3-(phenylamino) propyltrimethoxysilane (PAPTMS). The surface of silica is hydrophilic due to the abundance of silanol groups, resulting in poor utility in organic solvent. The degree of surface modification can be controlled by adjusting the pH,H2O/Si molar ratio, reaction temperature. The highly monodispersed nanosilica were obtained in organic solvent after surface modification.The property and morphology of nanosilica were characterized by dynamic light scattering(DLS), near infrared spectroscopy(NIR), 29Sinuclear magnetic resonance(Si-NMR).

다양한 표면에 유류된 잠재지문 현출시 친수성 양자점 나노 분말의 영향

오상재,유승진 한국과학수사학회 2022 과학수사학회지 Vol.16 No.3

In this research, hydrophilic quantum dot nano-powder (GQD@SiO2) was applied to compare the development of latent fingerprint on various surfaces and the development of latent fingerprint over time after fingerprint deposited. Hydrophilic quantum dot nano-powder exhibited green fluorescence under a wavelength of 365 nm ultraviolet, and increased adsorption characteristics through interaction with hydrophilic components in latent fingerprints showed clear minutiae on non-porous and semi-porous surfaces. It was difficult to express fingerprints on porous surfaces where fingerprint components were quickly absorbed, but on non-porous and semi-porous surfaces where fingerprint components could remain on the surface for a long time compared to porous surfaces, latent fingerprints could be expressed over time.

Adjustment of Hydrophilic-Lipophilic Balance of Hexamethyldisilazane-Modified Nanosilica for Enhanced Oil Recovery

Xiaohe Tao,Sai Guo,Peisong Liu,Xiaohong Li,Zhijun Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.2

Different dosages of hexamethyldisilazane (denoted as HMDS), a silane coupling agent, were adopted to modify nanosilica (denoted as NS) to afford a series of HMDS-NS nanoparticles with different hydrophilic-lipophilic balance governed by the amount of surface hydroxyl. The amounts of the hydrophilic hydroxyl of the as-prepared HMDS-NS nanoparticles and their water contact angles were measured, and their dispersing behavior in water and oil was examined in relation to their transfer behavior therein. Moreover, the effects of the as-prepared HMDS-NS nanofluids on the oil–water interfacial tension as well as the oil recovery were investigated based on interfacial tension measurements and simulated rock core flooding tests. Findings indicate that the hydrophilic-lipophilic balance of HMDS-NS nanoparticles highly depends on the amount of the surface hydroxyl, and the surface hydroxyl amount can be well adjusted by properly selecting the dosage of HMDS modifier. Besides, the transfer behavior of HMDS-NS nanoparticles in oil and water is closely related to their hydrophilic-lipophilic balance, and they can greatly reduce the oil–water interfacial tension and increase the oil recovery by 7.7–11.1% as compared with conventional water flooding. This is because the surface grafting of the hydrophobic segments of HMDS leads to a significant increase in the hydrophobicity of nanosilica, thereby changing the wettability of oil on the sand surface and favoring the stripping of oil droplets. Particularly, the HMDS-NS nanofluid obtained with 2wt.% of HMDS modifier has a water contact angle of 83.6 ° and can dramatically reduce the oil–water interfacial tension from 20.22mN/m to 0.28mN/m, showing desired hydrophilic-lipophilic balance and potential for enhanced oil recovery associated with chemical flooding.

Surface modification of polysulfone ultrafiltration membrane by in-situ ferric chloride based redox polymerization of aniline-surface characteristics and flux analyses

Vrinda Goel,Uttam Kumar Mandal 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.4

On the basis of the water-loving nature of Polyaniline (PANI), super hydrophilic polysulfone (PS) ultrafiltration membranes were prepared via in-situ polymerization of aniline on the surface of the membrane. Growing polyaniline in-situ leads to permeability enhancement of the ultrafiltration membrane. Surface-attenuated total reflection Fourier transform infrared spectroscopy, Atomic force microscopy, Scanning electron microscopy and energy dispersive X-spectroscopy and water contact angle demonstrated the successful attachment of PANI on PS membrane surface. Modified membranes containing increased amount of PANI were compared to the unmodified PS membrane to estimate the change in membrane performance, hydrophilicity and anti-fouling properties. PANI modified membranes showed higher water fluxes in comparison to unmodified membranes, while protein rejection was almost similar in both PANI modified and unmodified PS membranes. Atomic force microscopy and contact angle measurements confirmed increased membrane surface hydrophilicity with increasing PANI content. Fouling study and flux recovery experiments revealed that modified membranes exhibit higher flux recovery ratio (65%) and more stability to strong cleaning agents.

Surface modification of novel polyether sulfone amide (PESA) ultrafiltration membranes by grafting hydrophilic monomers

Alisa Mehrparvar,Ahmad Rahimpour 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-

In this study, new polymeric material namely polyether sulfone amide (PESA) containing hydrophilegroup was synthesized via polycondensation reaction of diamine with dicarboxylic acid. SynthesizedPESA was used as main polymer to fabrication of novel PESA UF membranes to improve the membraneproperties especially in view of fouling reduction. The PESA membrane was modified by grafting twohydrophilic monomers i.e. 3,5-diaminobenzoic acid (DBA) and gallic acid (GA) via interfacialpolymerization. The prepared membranes were characterized by contact angle measurement,equilibrium water content (EWC), scanning electron microscopy (SEM), atomic force microscopy(AFM), FTIR-ATR analyses. Membrane performance was evaluated by measuring the pure water flux andhumic acid (HA) solute separation with dead-end filtration system. As a result, the contact anglemeasurement showed that the PESA membrane had high hydrophilic surface. Also, super hydrophilicsurfaces were introduced by grafting DBA and GA on the surface of PESA membrane. The SEM imagesproved the formation of large finger-likes in the sublayer for PESA membrane. Filtration tests showedthat pure water flux and HA solution flux of the PESA membranes were higher in comparison to the PESmembrane. Although fluxes were obviously decreased after grafting monomers onto the PESAmembrane surface, higher HA separation efficiency was achieved. Meanwhile fouling tendency wasdecreased. All these results indicated that the new PESA modified membranes showed superiorperformance compared to the PES membrane. Furthermore, GA was found to be the most effectivehydrophilic monomer to improve the membrane hydrophilicity and fouling resistibility.

자외선/오존 조사에 의한 Poly(butylene adipate-co-terephthalate) 필름의 광산화

장진호 한국섬유공학회 2019 한국섬유공학회지 Vol.56 No.4

Biodegradable poly(butylene adipate-co-terephthalate) (PBAT) film was modified by UV/ozone irradiation. The surface properties of the irradiated PBAT were characterized by surface roughness, contact angles, ESCA, and ATR analyses. The UV/ozone treatment uniformly roughened the film surface, where the maximum surface roughness of the unirradiated sample increased from 74 nm to 239 nm with UV energy of 15.9 J/cm2. The modified PBAT became more hydrophilic as indicated by lower water contact angles of 10 o compared to the 72 o of the unirradiated PBAT. In addition, surface energy increased from 44.8 mJ/m2 for the unirradiated PBAT to 50.1 mJ/m2 with a larger UV energy of up to 15.9 J/cm2. In addition, the improvement in hydrophilicity was caused by the introduction of polar groups containing oxygen bonds such as C-O and C=O resulting in higher O1s/ C1s, which in turn resulted in a higher dyeability of the modified film to a cationic dye. The increased dyeability may have resulted from the photochemically introduced anionic and dipolar dyeing sites on the photo-oxidized PBAT surface.

Facile hydrophilic modification of polydimethylsiloxane-based sponges for efficient oil–water separation

Chao-Jen Wang,Wei-Fan Kuan,Hui-Ping Lin,Yury A. Shchipunov,Li-Jen Chen 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-

In this study, an eco-friendly fabrication process for the hydrophilic polydimethylsiloxane (PDMS)-basedsponge was proposed with the assistance of sugar templates and poly(dimethylsiloxane-b-ethyleneoxide) (PDMS-b-PEO) block copolymer additives. The effects of sugar loadings and sugar particle sizes onsponge structure and separation performance were investigated. Manipulating sugar loadings exhibiteda unique control over the porosity of sponge, which further influenced the absorption capacity and oil–water separation speed. Additionally, the surface modification of PDMS sponge from hydrophobic/oleophilic to hydrophilic/underwater oleophobic was achieved by incorporating PDMS-b-PEO. Suchmodified sponge demonstrated an underwater oil contact angle of 154 and a stable separation efficiencygreater than 99.9% in the gravity-driven cycledfiltration tests. The hydrophilic PDMS-b-PEO modifiedsponges highlighted herein reveal a promising potential for novel separation materials with energyefficientand cost-effective features, which are ideal for oil spill clean-up events and wastewatertreatment application.